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REVIEW article

Front. Pharmacol., 18 October 2022
Sec. Ethnopharmacology
This article is part of the Research Topic Applications of Herbal Medicine to Control Cardiovascular Disease View all 10 articles

Intervention effects of traditional Chinese medicine on stem cell therapy of myocardial infarction

Yu WangYu Wang1Yuezhen Xue
Yuezhen Xue2*Hai-dong Guo,
Hai-dong Guo1,3*
  • 1Academy of Integrative Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
  • 2Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
  • 3Department of Anatomy, School of Basic Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China

Cardiovascular diseases are the leading cause of global mortality, in which myocardial infarction accounts for 46% of total deaths. Although good progress has been achieved in medication and interventional techniques, a proven method to repair the damaged myocardium has not yet been determined. Stem cell therapy for damaged myocardial repair has evolved into a promising treatment for ischemic heart disease. However, low retention and poor survival of the injected stem cells are the major obstacles to achieving the intended therapeutic effects. Chinese botanical and other natural drug substances are a rich source of effective treatment for various diseases. As such, numerous studies have revealed the role of Chinese medicine in stem cell therapy for myocardial infarction treatment, including promoting proliferation, survival, migration, angiogenesis, and differentiation of stem cells. Here, we discuss the potential and limitations of stem cell therapy, as well as the regulatory mechanism of Chinese medicines underlying stem cell therapy. We focus on the evidence from pre-clinical trials and clinical practices, and based on traditional Chinese medicine theories, we further summarize the mechanisms of Chinese medicine treatment in stem cell therapy by the commonly used prescriptions. Despite the pre-clinical evidence showing that traditional Chinese medicine is helpful in stem cell therapy, there are still some limitations of traditional Chinese medicine therapy. We also systematically assess the detailed experimental design and reliability of included pharmacological research in our review. Strictly controlled animal models with multi-perspective pharmacokinetic profiles and high-grade clinical evidence with multi-disciplinary efforts are highly demanded in the future.

Introduction

Cardiovascular diseases (CVDs), principally ischemic heart disease (IHD) and stroke, are the leading cause of mortality globally (Roth et al., 2020). Moreover, myocardial infarction (MI) accounts for 46% of all deaths attributed to CVDs (Tsao et al., 2022). MI-induced blood insufficiency leads to myocardial necrosis and fibrotic scar formation, which eventually causes arrhythmias, ventricular dysfunction, and post-infarction congestive heart failure (Henry et al., 2021). Because of the limited capability of myocardial self‐regeneration, the damages are typically irreversible (Tzahor and Poss, 2017). Although good progress has been achieved in medication and interventional techniques such as primary coronary angioplasty, a proven strategy to repair the damaged myocardium has not yet been determined.

Novel methods have been identified for promoting myocardial regeneration by injecting stem cells into the infarcted heart (Miao et al., 2017). Stem cells act as undifferentiated cells, which can divide and differentiate into numerous mature cell types with specialized functions (Bacakova et al., 2018). Stem cells are mainly classified into two groups: embryonic stem cells (ESCs), pluripotent stem cells originating from the internal cellular mass of the blastocyst, and adult stem cells (ASCs) presenting in different tissues throughout the body after development (Lagarkova, 2019). However, most stem cells have defects in the treatment of MI, including low survival rate, immune exclusion, and low differentiation efficiency (Laplane and Solary, 2019). Due to this potential limitation, there has been significant interest in understanding the factors determining the survival of transplanted stem cells (Miao et al., 2017). Moreover, the hostile ischemic environment, rich in inflammation factors; free radicals generated by oxidative stress, and hypoxic areas further limit the efficiency of stem cell-based therapy (Fu et al., 2021).

Overcoming these limitations can improve the efficacy of stem cell therapy for heart diseases. One such strategy is to genetically manipulate the expression of critical genes involved in cell survival. Pro-survival genes such as Akt, Bcl-2, and SDF-1 improve stem cell viability after transplantation but with little efficacy (Penn and Mangi, 2008). Other strategies for improving the survival of transplanted stem cells in the ischemic myocardium have been developed, such as genetic modification of transplanted stem cells, stem cell transplantation in combination with growth factor delivery, and cell therapy using various scaffolds (Kim et al., 2013; Afjeh-Dana et al., 2022). A third and more critical strategy for myocardial infarction therapy is to promote angiogenesis and endothelial cell growth in the infarcted heart (Gu et al., 2015). However, only a portion of the stem cells successfully differentiates into cardiomyocytes but distributes in the less ischemic boundary zone. Therefore, transplanted stem cells are unable to form functional cardiac tissues, making the transplantation of stem cells for MI therapy less than optimal.

Chinese botanical and other natural drug substances are a major aspect of traditional Chinese medicine (TCM) and are a rich source of unique chemicals. As such, numerous studies have revealed the role of Chinese medicine in stem cell therapy for MI treatment, including promoting proliferation (Zhu et al., 2017), differentiation (Li et al., 2006), migration (Liu et al., 2013), angiogenesis (Guo et al., 2014), and survival (Cao et al., 2016) of stem cells. Here, we discuss the potential and limitations of stem cell therapy and the regulatory mechanism of Chinese medicines underlying stem cell therapy. We focus on the evidence derived from pre-clinical trials and clinical practices and summarize the theoretical basis for the efficacy of TCM from the perspective of stem cells.

Potential and limitations of stem cell therapy for treating myocardial infarction

Different sources of stem and progenitor cells, including ESCs and ASCs, have been validated for their ability to promote cardiac regeneration and repair (Rigaud et al., 2020). The therapeutic effects of unselected bone marrow cells (BMCs) (Fisher et al., 2014), hematopoietic stem cells (HSCs) (Shafei et al., 2018), mesenchymal stem cells (MSCs) (Ulus et al., 2020), resident cardiac stem cells (RCSCs) (Makkar et al., 2012), and induced pluripotent stem cells (iPSCs) (Drowley et al., 2016) have gained progression in basic translational and clinical applications. Moreover, skeletal myoblasts (SMs) (Menasché et al., 2008) and adipose-derived stem cells (ADSCs) (Davy et al., 2015) constitute other cell populations that may be suitable for cardiac repair. However, each cell category has its practical limitations and translational disadvantages (Figure 1). We discuss these in detail in the following sections.

FIGURE 1
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FIGURE 1. Limitations of stem cell-based therapy. Five types of stem cells, including ESCs, iPSCs, HSCs, RCSCs, ADSCs, and SMs, are involved in MI treatment, each of which has its limitations. ESCs face severe ethical issues with high tumorigenic and immunogenic characteristics; iPSCs have a high rate of tumorigenicity and a low survival rate. BMSCs and HSCs are characterized by self-renewal, no tumorigenicity, low immunogenicity, and strong immunomodulatory ability. However, their low survival rate leads to poor clinical efficacy. The biological functions of the subgroups of RCSCs have not been well detected yet, and the low survival rate, low differentiation rate, and even severe complications limit their application. SMs have lineage restrictions and thus, are unable to produce new cardiomyocytes. Moreover, the complexity, immunogenicity, and low survival of autologous SM products limited their wide application.

Potential and limitations of embryonic stem cells and induced pluripotent stem cell therapy

Although ESCs possess some distinctive advantages in cardiac repair, including their pluripotency, which means that they can differentiate into all types of cells, there are still ethical and regulatory concerns (Lo and Parham, 2009; Khan et al., 2015). More importantly, the risk of malignancies further limits ESC-based treatments (Madigan and Atoui, 2018). Although some methods to inhibit tumorigenesis have been used, reliable approaches to modulate and control differentiation in a controllable and efficient manner are still scarce (Carvalho et al., 2015). In addition, ESCs trigger severe immune rejection following allogeneic application (Samak and Hinkel, 2019). iPSCs are a promising alternative to ESCs in regenerative medicine, which can be redifferentiated from adult somatic cells (e.g., fibroblasts, epidermal cells, and hemocytes) using reprogramming techniques (Hynes et al., 2015). iPSC technology has been developed for auto-transplantation, bypassing ethical concerns associated with destroying fertilized embryos, and without an immune response (Faiella and Atoui, 2016). Moreover, unlike ASCs, which partly differentiate into a limited number of cell types, the iPSCs have a great potential to give rise to all lineages of cells (Chamberlain, 2016). While iPSCs give full play to the advantage of ESCs and ASCs, safety issues with these cells need to be addressed before they can be used in clinical settings. The property of infinite proliferation in iPSCs is a double-edged sword because if cells keep proliferating even after transplantation, they may result in tumors (Malchenko et al., 2014). Therefore, finding the best source of stem cells has always been one of the main problems in this field.

Potential and limitations of bone marrow mesenchymal stem cell therapy

One of the most promising cardiac cell-based therapies is unselected BMCs therapy, which has clinical surveillance for up to 5 years (Fisher et al., 2018). BMCs have some advantages for clinical application, including the ease of procurement and harvesting ex vivo, a sufficient number, and purity, and both have the properties of stem and progenitor cells (Haider, 2018). However, the results of clinical trials suggested that the effectiveness of BMCs is usually modest and less than the expectations of the originally intended result (Wollert et al., 2017; Zhang et al., 2021). In a randomized clinical trial, BMC intracoronary transplantation in acute myocardial infarction (AMI) patients did not increase the left ventricular ejection fraction (LVEF), and only a slight improvement in myocardial perfusion was observed in the BMC group (Grajek et al., 2010).

Therefore, more studies focused on the different subgroups of BMCs, which are divided into two populations, HSCs and non-HSCs.

Potential and limitations of hematopoietic stem cell therapy

As for HSCs, markers of CD133 and CD34 are generally adopted to select specific cell populations, and CD34+ cells possess more endothelial lineage-phenotype cells than CD133+ cells, considered “early” endothelial progenitor cells (EPCs) in HSCs (Chen et al., 2021a). A randomized controlled trial compared the LVEF after MI between unsorted and CD34+/CXCR4+-sorted BMCs (Tendera et al., 2009). After 6 months, a 3% increase in the LVEF was observed in patients treated, as discussed previously, whereas the control group remained unchanged. The CARDIO133 phase III clinical trial was designed to evaluate the effect of intra-myocardial injection of CD133+-sorted BMCs in cardiac repair (Nasseri et al., 2014). The results showed that CD133+-sorted BMCs improved regional scar perfusion but did not affect LV function. Presumably, this occurred because of the low baseline levels of HSCs, which limit their efficacy. Taken together, despite the diversity and therapeutic potential of BMC-based therapy, the clinical response of this therapy leaves great room for improvement; incorporating different combinations of biomarkers to reinforce the cellular repair capacity needs to be studied in the future.

Potential and limitations of mesenchymal stem cell therapy

MSCs, non-HSCs in bone marrow or adipose tissue, represent another potential selection for stem cell-based therapy. MSCs play an essential role in MI therapy because of their unique properties, including the ability to differentiate into cardiomyocytes (although controversial) (Wang et al., 2015), immunomodulatory property (Eldaly et al., 2022), anti-fibrotic activity (Li et al., 2015), and promotion of angiogenesis (Gao et al., 2017). Regarding differentiation ability, the combined treatment of MSCs and exogenous Jagged1 activated Notch1 signaling and caused multilineage differentiation (Ding et al., 2015). Moreover, the overexpression of miRNA1-2 in mouse MSCs promotes the differentiation of MSCs into cardiomyocyte-like cells through activation of the Wnt/β-catenin signaling pathway (Shen et al., 2017). However, it is widely acknowledged that the central effect of MSCs in the treatment of MI relies on the paracrine effect and not on the differentiation of MSCs into cardiomyocytes (Guo et al., 2020).

Bone marrow-derived MSCs (BMSCs), one of the adult pluripotent stem cells with great differentiation potential, low immunogenicity, and immune regulatory abilities, regulate different pathways of immune cells in a paracrine way (Bulati et al., 2020). BMSCs have great clinical application value and broad prospects due to their characteristics. However, the therapeutic efficacy of BMSC-based therapy in vivo remains a challenge. Previous studies have consistently indicated the poor survival of BMSCs after transplantation; about 90% of BMSCs died within the first 4 days (Zhao et al., 2019). Some researchers showed that BMSCs have a low survival rate in the cardiac environment, and most transplanted cells may disappear soon after transplantation (van der Spoel et al., 2011; Blocki et al., 2015; Li et al., 2016). When BMSCs are transplanted to ischemic zones, a hostile cardiac microenvironment, with a major proportion of reactive oxygen species (ROS), hypoxia, inflammation, fibrosis, and oxidative stress limit their survival potential (Lin et al., 2020). Currently, autologous and allogeneic BMSC transplantations are under investigation, whereas their therapeutic efficacy remains uncertain. In a clinical trial, 69 patients with AMI who underwent successful percutaneous coronary intervention (PCI) were transferred to receive an intracoronary infusion of BMSCs and saline. The results showed that BMSCs, at least in part, improved cardiac function without deaths (Chen et al., 2004). In another randomized, controlled trial, patients with ST-elevation AMI after reperfusion treatment within 12 h were randomly divided into BMSC-injection or standard medical treatment groups (Gao et al., 2013). BMSC-based treatment improved cardiac function and myocardial viability within the infarct area after 6 months in both groups compared with baseline; however, no significant difference was evident between these groups. The clinical benefits of BMSC-based therapy in patients with MI need further investigation and re-evaluation.

Moreover, adipose tissue also serves as a source of MSCs named ADSCs. Accumulating studies suggest that the effects of ADSCs are majorly related to paracrine action rather than trans-differentiation. The exosomes isolated from ADSCs attenuated cardiac injury after MI by activating the S1P/SK1/S1PR1 signaling pathway and increasing macrophage transition to the M2 phenotype (Deng et al., 2019). It was reported that conditional medium (CM) containing miR-221/222 from ADSCs significantly reduced cardiac apoptosis and fibrosis by reducing PUMA and ETS-1 expression, respectively (Lee et al., 2021). Meanwhile, miR-93-5p-encapsulating exosomes from ADSCs protected the myocardium by inhibiting autophagy and inflammatory response (Liu et al., 2018). Moreover, ADSCs-SIRT1-exosomes can recruit EPCs to the infarct area through Nrf2/CXCL12/CXCR7 signaling (Huang et al., 2020). However, clinical evidence remains scarce.

Potential and limitations of resident cardiac stem cell therapy

The adult mammalian heart has traditionally been thought of as a terminally differentiated organ, and cardiomyocytes have limited ability to regenerate for a long time (Windmueller et al., 2020). Nevertheless, RCSCs have been found and isolated in adult mammalian hearts, with multiple phenotypes, and they exhibit self-renewal capacity and multilineage potential, including differentiation into cardiomyocytes, smooth muscle cells, and endothelial cells under suitable conditions (Valiente-Alandi et al., 2016). Indeed, they are an appropriate candidate for cardiac regeneration therapy, for they are intrinsically programmed to form cardiac tissues and differentiate into parenchymal cells and coronary vessels rapidly upon activation (Uygur and Lee, 2016). Multiple subtypes of RCSCs are classified through surface markers and transcription genes, including c-kit+ RCSCs, Sca-1+ RCSCs, Islet-1+ RCSCs, side population RCSCs, and cardiosphere-derived CSCs (Li et al., 2019a). However, until now, whether RCSCs population extracted based on markers are of different types or whether they present a co-primitive cell type as the originator of these cells remains unclear. Moreover, the biological functions of the subgroups of RCSCs have not been well detected yet. There are still tremendous controversies about whether RCSCs can differentiate into a functional myocardium, especially after the retracted studies of Piero Anversa (Beltrami et al., 2003). It was reported that although c-kit+ RCSCs cannot differentiate into new cardiomyocytes directly, they can improve heart function through an immune response by recruiting the accumulation of CCR2+ and CX3CR1+ macrophages (Vagnozzi et al., 2020). Challenges still remain regarding the future direction of RCSCs before bringing them into clinical practice. For instance, difficulty in autogenous cell isolation and the low survival rate of RCSCs in infarcted hearts limited their application. Moreover, numerous complications have been discussed after RCSC implantation (Eschenhagen et al., 2017). It is essential to explore novel methods to improve homing, survival, proliferation, and differentiation of RCSCs in injured hearts.

Potential and limitations of skeletal myoblast therapy

SMs are commonly isolated from muscle tissues and suffer ex vivo expansion for MI treatment. Pre-clinical evidence has proved their repair effects in MI (Imanishi et al., 2011). Furthermore, some Phase I clinical trials have generated exciting results for the therapeutic efficiency of SMs in MI, suggesting an increasingly global and regional LVEF, and improvement in cardiac tissue viability in the infarct areas (Herreros et al., 2003; Siminiak et al., 2004; Dib et al., 2009). However, the results of the Phase II MAGIC trial showed that myoblast injections in patients with depressed LV function failed to improve their heart function and increased the number of early postoperative arrhythmic events (Menasché et al., 2008). The other limitations of SMs are summarized as follows. First, the most severe drawback of SM-based therapy may be their lineage restriction and inability to produce new cardiomyocytes (Terajima et al., 2014). Second, the complexity of autologous SM products limits their wide application (Ponsuksili et al., 2022). Third, the immunogenicity of SMs increases the risk and complications in clinical treatments. Lastly, SMs also have a low survival rate; up to 90% of SMs die over the first days after engraftment, and the myoblast-transplanted human heart confirms the scarcity of persisting myotubes in scar tissues (Skuk and Tremblay, 2019).

Regulatory mechanism of Chinese medicines underlying stem cell therapy

To overcome the limitations of stem cell therapy, researchers have applied various methods to find approaches to enhance its efficacy for MI. Therein, Chinese medicines stand out due to their high efficiency and low toxicity, offering a feasible approach to compensate for the disadvantages of stem cell therapy. Based on TCM theory, Zhang et al. studied the related research about stem cells and kidney essence, found their similarity in the origin of life and physiological function, and provided new ideas for the research on the basic theory of TCM (Zhang and Zhang, 2018). Moreover, they further refined the view of “kidney properties” activating blood and removing stasis and clarified that stem cells were the material basis of “kidney properties” (Zhang et al., 2016). Next, we discuss how Chinese medicines improve the efficacy of stem cell therapy in TCM theories. More importantly, we will categorize TCM in prescription, botanical and other natural drug substances, pure compounds; and experiments in vivo and in vitro to better understand the mechanisms of TCM treatment in MI. We have summarized the mechanism of Chinese medicines for stem cell therapy in Figure 2 and Table 1, 2.

FIGURE 2
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FIGURE 2. Mechanisms of Chinese medicines based on TCM theory enhance the efficacy of stem cell therapy. Chinese medicine promotes the proliferation, migration, differentiation, angiogenesis, and survival of stem cells. Through the summary analysis from commonly used prescriptions, the mechanisms based on TCM theory may be finally inferred as follows: 1) Chinese medicine promotes the proliferation of stem cells by tonifying the spleen and kidneys, nourishing qi and blood; 2) Chinese medicine promotes migration of stem cells by tonifying the qi and activating blood; 3) Chinese medicine promotes differentiation of stem cells by tonifying the kidney and activating blood; and ) Chinese medicine promotes angiogenesis and survival by tonifying qi and activating blood.

TABLE 1
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TABLE 1. Summary of prescriptions on stem cell therapy.

TABLE 2
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TABLE 2. Summary of natural drug substances on stem cell therapy.

Chinese medicines promote the proliferation of stem cells by tonifying the spleen and kidney, nourishing qi and blood

The regenerative potential of stem cells is directly proportional to the number of available stem cells and their proliferation ability (Hedderich et al., 2020). Among these stem cells, BMSCs can differentiate into various lineages without risk of immunological rejection, so they have been mostly applied in stem cell transplantation. With developments in chemical purification technologies and mass spectrometry, the active compounds of numerous Chinese medicine formulas have been successfully purified, and their effects on BMSC proliferation have been detected.

For instance, Si–Wu decoction (SDE), a classic blood-tonifying formula in TCM, has been adopted for clinical treatment in China for centuries. Zeng H. P. et al., extracted the active ingredients of this formula using ethyl acetate/chloroform to explore its proliferation-promoting effects on BMSCs (Zeng et al., 2008). A total of 20 compounds were obtained, and ligustilide displayed the best proliferation-promoting effect. Palmitic acid methyl ester and stearic acid ethyl were also responsible for promoting the proliferation of BMSCs. Extractions with 0.3 mg/ml concentration had a better efficacy of BMSCs proliferation than bFGF, a common positive control in this area. Furthermore, another constituent of flavonoids from the Epimedium brevicornu Maxim. [Berberidaceae] (EBM), icariin (ICA), also facilitated the proliferation of BMSCs by activating ERK and p38 MAPK signaling pathways, and regulating their downstream transcription factors Elk1 and c-Myc (Qin et al., 2015). Several studies found the active components of Plastrum testudinis [Testudinidae] (PT) were able to promote BMSCs proliferation (Chen et al., 2007; Wang et al., 2012a). Further mechanism studies suggested that myristate is the main active component of PT, and it can increase the release of bone morphogenetic protein 4 (BMP4) from BMSCs in a time- and dose-dependent manner (Chen et al., 2009). Buzhong Yiqi decoction (BYD), a tonic formula of TCM, and its active compound, hexadecanoic acid (HA), was responsible for promoting the proliferation of BMSCs (Chen et al., 2010). Moreover, astragaloside, a compound from qi-replenishing Chinese medicine, promoted differentiation and proliferation, inhibited apoptosis, and reduced the inflammatory effects of BMSCs (Zhu et al., 2017).

ADSCs are believed to be a suitable cell source of regenerative treatment for their self-renewal capacity and multilineage differentiation. Chinese medicine also exhibits proliferation-promoting action in ADSCs. Rehmannia glutinosa oligosaccharide (RGO), an extract from Chinese medicine, has been proven to increase proliferation and relieve H2O2-induced apoptosis of ADSCs by the paracrine secretion of VEGF and HGF (Zhang et al., 2012). These studies have now allowed for refinement in the understanding of TCM with respect to pharmacological regulation of proliferation of stem cells and may be helpful to stem cell biology and therapy.

In summary, according to the TCM theory—“Kidney dominated bone marrow” (Gu et al., 2019), Chinese medicines used in promoting the proliferation of stem cells are mainly kidney-tonifying medicines such as ICA and PT or blood-nourishing medicines such as ligustilide and RGO. To a certain extent, this conforms to the mechanism of the inadequate number of stem cells in modern medicine and provides an integrative theoretical foundation for the proliferation of stem cells.

Chinese medicines promote the mobilization and migration of stem cells by tonifying the qi and activating blood

Stem cells need to be recruited to infarct areas after reaching a certain number. TCM promotes the mobilization and migration of stem cells as well. Several BMSC-mobilizing factors, including transforming growth factor-β (TGF-β), tumor necrosis factor-α (TNF-α), stromal-derived factor-1 (SDF-1), and hepatocyte growth factor (HGF), can promote the migration of BMSCs and induce cardiac repair (Yu et al., 2015; Sun et al., 2018). Guanxin Danshen (GXDS) formulation with the preparation of dripping pills, which mainly activates blood in various diseases, increased SDF-1 levels in the infarcted area and enhanced the migration of BMSCs (Han et al., 2019). Shuangxinfang aqueous extract (Wang et al., 2019) and classical TCM prescriptions derived from the Danshen decoction and Baihe Dihuang decoction promoted the mobilization of BMSCs, inhibited the inflammatory response, and improved heart function after AMI. As a new dosage form of TCM, TCM injection (TCMI) is an important step in the modernizing of TCM. Danhong injection (DHI) increased the residence of BMSCs in cardiac tissue by regulating the SDF1/CXCR4 signaling (Chen et al., 2018). Moreover, the aqueous extract of Ligusticum striatum DC. [Apiaceae] and Paeonia lactiflora Pall. [Paeoniaceae] protected cardiomyocytes by promoting angiogenesis and mobilization of stem cells (Shi et al., 2019). Consequently, TCM prescriptions for promoting blood circulation or removing blood stasis are useful in promoting the migration of stem cells and the treatment of MI. Meanwhile, the specific blood-activating compounds are investigated as follows.

Tanshinone IIA (TIIA)- and astragaloside IV-stimulated BMSCs showed enhanced capacities of homing to ischemic myocardium partially by upregulation of the CXCR4 expression (Xie et al., 2013). Panax notoginseng saponins (PNS) combined with G-CSF to promote c-kit+ BMSCs from the marrow into blood circulation and mobilized their “homing” to the infarction sites (Zhang et al., 2011). Further studies revealed that PNS increased the mobilization of progenitor cells via SDF-1α-CXCR4 interaction, thus decreasing the sizes of atherosclerotic plaques (Liu et al., 2013) as well as resveratrol (RSV) (Hong et al., 2015). Additionally, acupuncture is an important part of TCM and plays an essential role in stem cell mobilization as well. Recently, we have demonstrated that electro-acupuncture can repair myocardial damage by regulating the SDF-1/CXCR4 axis (Zhao et al., 2022).

Chinese medicines promote the differentiation of stem cells by tonifying the kidney and activating blood

The most important suggested mechanism of stem cell therapy is a substitution of injured cells by brand new stem cells, which needs successful differentiation in infarct areas (Müller et al., 2018). Nevertheless, in all cases, the differentiation efficiency of stem cells is low, limiting the progression of stem cell differentiation in stem cell therapy (Bian et al., 2019). Due to its importance, TCM has been widely used for the differentiation of stem cells.

For example, Geum japonicum var. Chinense F. Bolle [Rosaceae] (GJ), usually used in the Miao ethnic minority group, promoted the cardiogenic differentiation capability of BMSCs, thus repairing infarcted hearts (Cheng et al., 2009). Further studies have shown that cardiogenin is the main active compound of GJ, which stimulates the processes of angiogenesis and cardiomyogenesis (Li et al., 2006; Lin et al., 2012). The Shuanglong formula (SLF) composed of ginsenosides Rg1 and salvianolic acid B (SalB) promoted BMSCs into cardiomyocyte-like cells (Fan et al., 2010). Therein, SalB (Guo et al., 2014), a water-soluble component of Salvia miltiorrhiza Bunge [Lamiaceae] induced BMSCs to differentiate into vascular endothelial cells (VECs), but not cardiomyocytes, improving angiogenesis and heart function after BMSC transplantation mainly through a paracrine effect. Long-term oral intake of Gu Ben Pei Yuan San (GBPYS) powder significantly improved cardiac function by promoting the division of both cardiomyocytes and iPSC-derived cardiomyocytes in vitro. Oral intake of GBPYS improved heart repair after myocardial damage in adult mice (Cui et al., 2019). GBPYS feeding for 3 months had no apparent toxicity to the liver, kidneys, and blood in normal mice, suggesting the relative safety of TCM treatment. Moreover, the extracts from Codonopsis pilosula (Franch.) Nannf. [Campanulaceae] promoted the cardiogenic differentiation of ESCs (Wang et al., 2021).

In conclusion, replenishing qi and activating blood is the basic therapeutic principle of TCM in regulating stem cell differentiation. In addition, electrical stimulation enhanced the efficiency of cardiac differentiation into iPSCs and promoted cardiomyocyte maturation (Ma et al., 2018). In fact, ESCs and iPSCs can differentiate into spontaneously beating cardiomyocytes, while ASCs can only be differentiated into cardiac cell types of expression of cardiomyocytic markers (Gurusamy et al., 2018). However, small molecular compounds facilitate the trans-differentiation of fibroblasts into cardiomyocytes directly (Fu et al., 2015) or induced ASCs to iPSCs (Guan et al., 2022). Thus, identifying potential natural drug compounds may provide new methods for developing regenerative therapeutic strategies.

Chinese medicines promote angiogenesis of stem cells by tonifying qi and activating blood

MI inflicts massive damage to the coronary micro-circulation, resulting in vascular disintegration and rarefication of capillaries in the ischemia area (Wu et al., 2021). Cardiac repair after MI involves complex angiogenesis, which starts in the infarct border region and expands to the infarct core. TCM facilitates angiogenesis in the infarct zone through several mechanisms.

EPCs serve as endogenous repair cells to counteract endothelial cell damage, substitute dysfunctional endothelium, and repair tissue after MI (Berger et al., 2013). Xuefu Zhuyu decoction (XFZYD) induced the angiogenesis of EPCs and promoted capillary tube formation (Gao et al., 2010). BMSCs have a strong ability to promote angiogenesis, and TCM combined with them to enhance the process of angiogenesis. DHI (Chen et al., 2018) and PNS (Zheng et al., 2013) increased the expression of VEGF-A of BMSCs in the marginal zone of infarction. The combination of Ligusticum striatum DC. [Apiaceae], Paeonia lactiflora Pall. [Paeoniaceae] (Shi et al., 2019), and SalB (Guo et al., 2014) protected the ischemic myocardium through angiogenesis. Astragaloside IV (AS-IV) promoted angiogenesis and cardio-protection after MI by activating the PTEN/PI3K/Akt signaling pathway (Cheng et al., 2019).

Chinese medicines promote the survival of stem cells under the cardiac microenvironment by tonifying qi and activating blood

The efficacy of stem cell-based therapy is based on the survival of stem cells, as well as on the alteration of phenotype and biology that may take place on these cells after engraftment (Franchi et al., 2020). The post-ischemic myocardial microenvironment, characterized by inflammation, oxidative stress, hypoxia, and fibrosis, may inhibit the survival of stem cells (Wei et al., 2016). TCM can protect stem cells by countering the hostile cardiac microenvironment.

Tongxinluo (TXL) is extracted and concentrated from a group of botanical and other natural drug substances, including Panax ginseng C.A. Mey. [Araliaceae], Paeonia lactiflora Pall. [Paeoniaceae], Cinnamomum camphora (L.), J. Presl [Lauraceae], and Ziziphus jujuba Mill. [Rhamnaceae], which benefits qi and performs the function of blood activation (Qi et al., 2015). It could induce the survival and differentiation of BMSCs through the inhibition of apoptosis, oxidative stress, less fibrosis, and inflammatory cell infiltration with more surviving myocardium (Qian et al., 2007; Li et al., 2014; Xiong et al., 2022a). Moreover, TXL-pretreated BMSCs significantly improved cardiac repair through the exosomal transfer of miR-146a-5p by the IRAK1/NF-κB p65 pathway, which may have the potential for clinical translation (Xiong et al., 2022b). In addition, the GXDS formulation increased the number of injected BMSCs in the infarct area by decreasing cell apoptosis and promoting angiogenesis in the peri-infarction and infarction area (Han et al., 2019). Total paeony glucosides (TPGs) extracted from the roots of Paeonia lactiflora Pall. [Paeoniaceae] alleviated the dysfunction of cardiomyoblast by preserving antioxidant defense (Luo et al., 2013). Moreover, SalB (Gao et al., 2019) and ginsenoside Re (Yu et al., 2020) inhibited the fibrosis process of the myocardial via regulating TGF-β/Smads signal pathways, whereas tanshinone IIA showed anti-fibrosis action by inhibiting oxidative stress (Chen et al., 2021b). Tetramethylpyrazine/ligustrazine (TMP) increased the survival rate of ADSCs, probably inducing the expression of transcription factors associated with fat formation, including peroxisome proliferator-activated receptor γ (PPARγ), CCAAT/enhancer-binding protein α, and Alu (Zhou et al., 2020). Our previous work has also shown that Taohong Siwu decoction (THSWD) aqueous extract improved the local ischemic microenvironment by decreasing mitochondrial fission after MI (Luo et al., 2019). Moreover, we designed a nanoparticle of MSN-Notoginsenoside R1 (NGR1)-CD11 b antibody, which enhanced the targeting of NGR1 via activation of AKT and MAPK signaling pathways and might provide a new method for targeted drug delivery systems for the MI (Li et al., 2022). Taken together, TCM promotes the survival of stem cells by ameliorating hostile microenvironment in infarction areas, including remodeling inflammation microenvironment, fibrosis microenvironment, hypoxia microenvironment, oxidative stress microenvironment, and angiogenesis microenvironment.

Deficiencies of Chinese medicines in stem cell therapy

Although the pre-clinical evidence shows that TCM is helpful in stem cell therapy, further mechanisms involved in TCM have not been thoroughly investigated. We systematically assessed the detailed experimental design and reliability of included pharmacological research in our review according to the consensus of the best practice in research (Heinrich et al., 2020). Of the total 37 MI studies, 10 in vitro, 12 in vivo, and 15 in vivo and in vitro studies, only one study provided patient-relevant results. Among these 37 studies, only one study evaluated the toxicity of TCM (Cui et al., 2019), and three studies used positive control (Zeng et al., 2008; Zhang et al., 2011; Gao et al., 2019). Overall, the majority of the studies present specific experimental details and verify the effectiveness of TCM treatment. However, the putative TCM efficacy based on pre-clinical studies may not be accurate and comprehensive enough.

Pharmacokinetic (PK) studies are essential to build concentration-activity/toxicity and promote target identification of Chinese medicine (Yan et al., 2018). TCM PK routines include five dimensions: 1) system analysis of chemical substances using liquid chromatograph mass spectrometry (LC–MS) together with the utilization of data in available chemical databases; 2) identification of the absorbed prototypes, absorbed metabolites, and unabsorbed constituents of TCM in vivo; 3) comprehensive study of the therapeutic mechanisms of TCM; 4) establishment of the qualitative and quantitative pharmacokinetics–pharmacodynamics (PK–PD) patterns by multidimensional data and mathematical modeling; and 5) validation of the main compounds and targets by gene-editing technology (Xu et al., 2021). Most studies in this review have met the basic requirements of PK studies. For example, silica gel column chromatography was used to identify the extraction of Si–Wu decoction (Zeng et al., 2008), and GC–MS was adopted to analyze the active compounds of Plastrum testudinis [Testudinidae] (Chen et al., 2007) and Buzhong Yiqi decoction (Chen et al., 2010). However, the plasma drug PK involves absorption, distribution, metabolism, and excretion of TCM in the body which has not been directly examined in these studies. TCM may perform a synergistic function in treating MI in combination with stem cell-based therapy by regulating the multi-targets through various signaling pathways. Strictly controlled animal models with multi-perspective pharmacokinetic evaluation need urgent investigation.

In addition, the efficacy of TCM in stem cell therapy still lacks high-grade clinical evidence. Zhang et al. (2020) systematically reviewed the effect of TCM on patients with MI, but the evidence from clinical trials was insufficient to assess the effect of TCM on patients with MI. Further rigorously designed random clinical trials with a large cohort of patients are required to verify or discover the efficacy of TCM in treating MI. Multi-disciplinary efforts are highly demanded to translate TCM-based treatment into a more persuasive proof of clinical efficacy.

Moreover, the side effects of TCM in stem cell therapy cannot be ignored. SMB, a commonly used botanical drug for MI treatment, is considered relatively safe and well tolerated during the treatment (Wang et al., 2012b). However, SMB injection may cause body weight loss and even increase the total bilirubin level and focal inflammation in a dose-dependent manner. In a cohort study, 30,180 patients were recruited to evaluate the adverse events of SMB, and the results showed that SMB might cause rashes, pruritus, platelet count abnormalities, and palpitations (Jia et al., 2019). Nevertheless, the most adverse events of SM were mild to moderate and cleared up after SM treatment withdrawal. Carthamus tinctorius L. [Asteraceae], with the efficacy of activating blood and resolving stasis, led to acute liver failure (ALF) in a few patients (de Ataide et al., 2018). In addition, the kidney-tonifying botanical drug, Cullen corylifolium (L.) Medik. [Fabaceae], caused ALF as well (Li et al., 2019b). Moreover, pre-treatment of umbilical cord-derived mesenchymal stem cells (UC-MSCs) with asarinin significantly promotes the immunosuppressive effects of MSC after HSC transplantation (He et al., 2021), whereas it may have multiple cytotoxic effects, including arrhythmia, respiratory center depression, hepatotoxicity, and nephrotoxicity (Jeong et al., 2018). These are Chinese medicines commonly used in the clinical practice of MI; thus, attention must be paid when using these botanical drugs. First, it is recommended to take botanical drugs following the doctors’ instructions with a moderate dose. Second, processing (Paozhi) through steaming, boiling, stewing, refined honey, stir-frying, and calcining can directly reduce the contents of toxic constituents (Wu et al., 2018). Eventually, this not only alleviates the side effect of TCM but also improves oral absorption and bioavailability by using modern methods and materials to modify the TCM dosage form, such as lipid nanocarriers, polymeric nanocarriers, inorganic nanocarriers, and hybrid nanocarriers (Liu and Feng, 2015).

Conclusion

Stem cell-based therapy after MI has made excellent progress in the last decade, whereas its drawbacks, such as low survival rate, low differentiation rate, and strong immunogenicity, severely limited the clinical application of this therapy. Our review showed that TCM has a great potential to compensate for the limitation of stem cells and can thus work together in preventing and treating MI. Based on TCM theories, we further summarized the mechanisms of Chinese medicine treatment in stem cell therapy by the commonly used prescriptions discussed previously. It seems that the role of TCM differs in different stages of stem cell therapy: 1) during the proliferation of stem cells, TCM mainly functions by tonifying the spleen and kidneys, nourishing qi and blood; 2) during the migration of stem cells, TCM mainly functions by tonifying the qi and activating blood; 3) during the differentiation of stem cells, TCM mainly functions by tonifying the kidneys and activating blood; and 4) when stem cells reach the infarct region, TCM can protect them even under hostile microenvironments by tonifying the qi and activating blood. In conclusion, tonifying the spleen and kidneys, replenishing qi, and activating blood are the basic therapeutic principles of TCM throughout the stem cell therapy. The principles allow us to choose the appropriate Chinese medicines in different stages of stem cell therapy for a more defined and precise functional study.

Author contributions

YW and H-DG conceived the structure of the manuscript. YW wrote the manuscript and constructed the figures. YX and H-DG reviewed and revised the manuscript. All authors read and approved the final manuscript.

Funding

This work was supported by grants from the National Natural Science Foundation of China (82174120, 81970991), Natural Science Foundation of Shanghai (No. 21ZR1463100), Shanghai Talent Development Funding Scheme (No. 2019090), and Program of Shanghai Academic Research Leader (22XD1423400).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fphar.2022.1013740/full#supplementary-material

Supplementary Table S1 | Composition of TCM prescription.

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Glossary

CVDs cardiovascular diseases

MI myocardial infarction

IHD ischemic heart disease

ESCs embryonic stem cells

ASCs adult stem cells

TCM traditional Chinese medicine

BMCs bone marrow cells

HSCs hematopoietic stem cells

MSCs mesenchymal stem cells

RCSCs resident cardiac stem cells

iPSCs induced pluripotent stem cells

SMs skeletal myoblasts

ADSCs adipose-derived stem cells

AMI acute myocardial infarction

LVEF left ventricular ejection fraction

EPCs endothelial progenitor cells

BMSCs bone mesenchymal stem cells

ROS reactive oxygen species

PCI percutaneous coronary intervention

CM conditional medium

SDE Si–Wu decoction

EBM epimedium brevicornum Maxim

ICA icariin

PT Plastrum testudinis

BMP4 bone morphogenetic protein 4

FP Fructus Psoraleae

BYD Buzhong Yiqi decoction

HA hexadecanoic acid

SalB salvianolic acid B

RGO Rehmannia glutinosa oligosaccharide

APS Angelica polysaccharides

SMSCs skeletal muscle satellite cells

TCMI TCM injection

DI Danshen injection

TGF-β transforming growth factor-β

TNF-α tumor necrosis factor-α

SDF-1 stromal-derived factor-1

HGF hepatocyte growth factor

GXDS Guanxin Danshen

CHSIBA Shen invigorating and blood activating

DHI Danhong injection

SMB Salvia miltiorrhiza Bunge

YWHR Yiqi Wenyang Huoxue recipe

TIIA Tanshinone IIA

PNS Panax notoginseng saponins

RSV resveratrol

MK Musk ketonem

GJ Geum japonicum

SLF Shuanglong formula

VECs vascular endothelial cells

XZD Xuefu Zhuyu decoction

GBPYS Gu Ben Pei Yuan San

CMECs Cardiac microvascular endothelial cells

QLC Qiliqiangxin capsule

XFZYD Xuefu Zhuyu decoction

TXL Tongxinluo

TPG Total paeony glucosides

TMP Tetramethylpyrazine

PPARγ peroxisome proliferator-activated receptor γ

AS-IV astragaloside IV

THSWD Taohong Siwu decoction

NGR1 Notoginsenoside R1

RCT random clinical trials

ALF acute liver failure

UC-MSC umbilical cord-derived mesenchymal stem cells

Keywords: traditional Chinese medicine, stem cells, myocardial infarction, survival, migration

Citation: Wang Y, Xue Y and Guo H-d (2022) Intervention effects of traditional Chinese medicine on stem cell therapy of myocardial infarction. Front. Pharmacol. 13:1013740. doi: 10.3389/fphar.2022.1013740

Received: 07 August 2022; Accepted: 03 October 2022;
Published: 18 October 2022.

Edited by:

Jie Liu, Zunyi Medical University, China

Reviewed by:

Shangfu Xu, Zunyi Medical University, China
Liping Shu, Guizhou Medical University, China
Peng Cao, Nanjing University of Chinese Medicine, China

Copyright © 2022 Wang, Xue and Guo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Yuezhen Xue, yzxue@imcb.a-star.edu.sg; Hai-dong Guo, hdguo@shutcm.edu.cn

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