Yiling Wang
Yan Yang†
Jianyou Shi
Xingmei Duan
Yuxuan Zhu- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Science & Sichuan Provincial People’s Hospital, University of Electronic Science and Technology of China, Chengdu, China
Leukemia is a malignancy initiated by uncontrolled proliferation of hematopoietic stem cell from the B and T lineages, resulting in destruction of hematopoietic system. The conventional leukemia treatments induce severe toxic and a long series of unwanted side-effects which are caused by lack of specificity of anti-leukemic drugs. Recently, nanotechnology have shown tremendous application and clinical impact with respect to diagnosis and treatment of leukemia. According to considerable researches in the context of finding new nanotechnological platform, iron oxide nanoparticles have been gained increasing attention for the leukemia patients use. In this review, a short introduction of leukemia is described followed by the evaluation of the current approaches of iron oxide nanoparticles applied in the leukemia detection and treatment. The enormous advantages of iron oxide nanoparticles for leukemia have been discussed, which consist of the detection of magnetic resonance imaging (MRI) as efficient contrast agents, magnetic biosensors and targeted delivery of anti-leukemia drugs by coating different targeting moieties. In addition, this paper will briefly describe the application of iron oxide nanoparticles in the combined treatment of leukemia. Finally, the shortcomings of the current applications of iron-based nanoparticles in leukemia diagnosis and treatment will be discussed in particular.
1 Introduction
Leukemia is a tumor of the hematopoietic and lymphoid tissues. Clonal leukemia cells proliferate, accumulate and infiltrate in the bone marrow and other hematopoietic and non-hematopoietic tissues due to abnormal proliferation of differentiated hematopoietic stem cell or progenitor cells, thus affecting the physiological bone marrow of various tissues and organs. Siegel et al. (2019) Symptoms are usually characterized by bleeding, fever, immunosuppression, bone and joint pain, hepatosplenomegaly, and lymphadenopathy, these symptoms are caused by varying degrees of anemia, neutrophil, thrombocytopenia, or tissue infiltration. Chen and Zhou (2012) According to the progression of the disease, leukemia is mainly classified as acute and chronic, while leukemia is mainly classified as lymphoid and myeloid leukemia according to the origin of malignant proliferating cells. Alsalem et al. (2018) Current therapies of leukemia include chemotherapy, radiotherapy, targeted therapy and stem cell transplantation. Kadia et al. (2015) Although, many studies have shown that viruses, genetics, radiation and chemical toxins may cause leukemia, the cause of leukemia is still not a unified answer. Curtis et al. (1992); Lo et al. (2010); Winandy et al. (1995) The other hand, the clinical characteristics of different types of leukemia are obviously different. Because of the limitation of the above factors, there is no uniform treatment of leukemia at present. Short et al. (2018).
Chemotherapy is the most common treatment for leukemia. Pant and Bhatt (2017) Chemotherapy drugs such as vinblastine, Cytarabine, Vindesine, daunorubicin, northromycin, doxorubicin, and mitoxantrone are often used. Single drug often leads to drug resistance, so combination therapies are used to treat leukemia in order to reduce even eliminate drug resistance. Kantarjian et al. (2010) The “3 + 7 regimen” proposed in the 1970s has become the cornerstone of induction chemotherapy for acute myeloid leukemia (AML), which can achieve a certain remission rate. However, for older patients with leukemia, this regimen can lead to up to 30% early treatment-related mortality and the survival rate is less than 10 percent in 3–5 years Gardin et al. (2020).
Radiotherapy is the treatment of malignant tumors with radionuclide alpha, beta, gamma radiation and X-ray, electron and proton beams produced by various X-ray therapy machines or accelerators. Walter (2022) Radiation inevitably exposes normal cells to ionizing radiation, so there is a risk that cancer may develop again during treatment. Bodet-Milin et al. (2016).
Targeted therapy, as one of the treatment modalities for leukemia, has three main therapeutic mechanisms: small molecule inhibitors that target gene mutations, inhibitors that target key signaling pathways, and antibodies or antibody-coupled drugs that target cell surface molecules. Newell and Cook (2021) Although great progress has been made in the treatment of leukemia with targeted therapy, there are still many problems. For example, treatment of leukemia with FLT 3 inhibitors alone, such as Gilteritinib, is less toxic than conventional chemotherapy, but resistance continues to develop in patients with certain gene mutations. Travis et al. (2000).
Currently, Hematopoietic stem cell transplantation (HSCT) is considered to be an effective treatment for leukemia. Ljungman et al. (2019) HSCT is to kill as many abnormal cells or tumor cells as possible through high-dose chemotherapy or radiotherapy, and then restore hematopoietic and immune functions through intravenous infusion of pre-collected autologous or allogeneic stem cells. Pavlů and Apperley (2013) However, HSCT also cause some adverse reactions. After allogeneic stem cell transplantation, the need for immunosuppressants, may cause low immunity, secondary infection. Zhao et al. (2019) Moreover, some patients may have a graft-versus-host reaction, which not only leads to graft failure, but also to death. Peccatori and Ciceri (2010).
The above-mentioned therapies generally have some disadvantages, such as low drug targeting, high adverse reactions, and drug resistance in patients. Therefore, it is very important to develop an efficient and targeted intelligent drug delivery system in the past decades Wicki et al. (2015) With the continuous progress of nanotechnology, nanotechnology has been widely used in drug delivery, disease diagnosis and treatment (Patra et al., 2018).
Iron oxide nanoparticles (IONPs) in the diagnosis and treatment of cancer has attracted more and more attention. Wang et al. (2018) Furthermore, iron-based nanoparticles have high transverse relaxation rate, good biocompatibility and long circulation in vivo, has been widely used as magnetic resonance imaging (MRI) contrast agent for tumor diagnosis. Na et al. (2009); Lee et al. (2012) Iron oxide nanoparticles have unique magnetic properties and can be used as magnetic thermotherapy, photothermal therapy and magnetic targeted drug delivery. Alphandéry (2019); Li et al. (2017) Based on its characteristics, it has been used more and more in hematological tumors in recent years.
In this paper, the current status of leukemia treatment, the preparation of iron nanoparticles and their application in leukemia detection and treatment are briefly introduced (Figure 1). This article reviews the great advantages of iron nanoparticles in the treatment of leukemia, including MRI detection as an effective contrast agent, tumor-related iron-based nanoparticle therapy, and targeted drug delivery by coating different targets. In addition, this paper will briefly introduce the application of iron-based nanoparticles in combination therapy of leukemia. Finally, the shortcomings of the current application of iron-based nanoparticles in the diagnosis and treatment of leukemia will be particularly discussed.
FIGURE 1. Application of IONPs in leukemia.
2 Iron-based nanoparticles
In recent years, nanotechnology has been widely used in the diagnosis and treatment of various diseases, especially in oncology. El-Sherbiny et al. (2017) Nanomedicine overcomes many disadvantages of traditional cancer treatment methods for cancer treatment, such as low bioavailability, drug resistance and side effects of patients, which provides a new and effective treatment for cancer. Nagaraju et al. (2021) In addition, through the surface modification of nanoparticle structures and the integration of tumor diagnosis and treatment, nanomaterials can also be used for early diagnosis, imaging, precision therapy and smart anti-cancer drugs. Auría-Soro et al. (2019).
As an important endogenous trace element, iron is widely distributed in various tissues of human body to maintain biological health. In recent years, iron-based nanomaterials have been widely used in various fields of biomedicine. Xie et al. (2018) Through the precise control and surface modification of magnetic materials, nano-materials such as iron oxide nanoparticles have been widely used in the biomedical research field, as a contrast agent for drug delivery such as magnetic resonance magnetic resonance imaging hyperthermia drug delivery. Shen et al. (2017) Recently, with the development of nanomedicine, more and more IONPs have been used in the diagnosis and treatment of leukemia.
2.1 Preparation and modification of iron oxide nanoparticles
There are many methods for preparing magnetic iron oxide nanoparticles, such as physical methods, chemical methods and microbial technology. Wei and Wang (2013) The physical chemistry properties of the prepared magnetic ferroferric oxide nanoparticles (Fe3O4NPs) are closely related to the preparation methods. Laurent et al. (2008) Therefore, it is very important to choose a suitable method to synthesize magnetic nanoparticles; Song et al. (2019) Among the many methods, the most commonly used are chemical methods, which have lower synthesis costs and higher yields; Hu et al. (2018) Chemical methods of preparation of Fe3O4NPs include thermal decomposition method, hydrothermal method, co-precipitation method, micro-emulsion method; Sodipo and Aziz, (2016) The most common method for Fe3O4NPs preparation is co-precipitation. There are the detailed characteristics of these methods (Table 1).
TABLE 1. Comparison of the characteristics of different synthesis methods of IONPs.
Although the preparation of Fe3O4NPs is mature, there are still several problems in production and application, such as the formation of aggregation due to the instability of nanoparticles. Mohammadi et al. (2013) Therefore, it is necessary to modify the surface of Fe3O4NPs. The appropriate surface modification has ability to improve the stability, targeting ability and biocompatibility of Fe3O4NPs nanoparticles (Arias et al., 2018). The various materials used to modify IONPs have different advantages and applications (Table 2).
TABLE 2. Characteristics of different modifying materials for IONPs.
2.2 Iron-based nanoparticles and magnetic resonance imaging
Molecular imaging plays an important role in tumor detection and prognosis monitoring (Gordon et al., 2019). This technology has high accuracy and reliability in elucidating the process of tumor development and monitoring the condition of patients. Current imaging techniques include optical imaging (OI), X-ray computed tomography (CT), Positron emission tomography Single-photon emission computed tomography (PET SPECT) (Fonti et al., 2019), magnetic resonance imaging (MRI) and ultrasound (US) (Mammatas et al., 2015). Compared with other imaging methods, MRI has many advantages, such as non-invasive, high resolution, high soft tissue resolution and fast living imaging. It has become an important tool in clinical imaging diagnosis and disease monitoring (Chandarana et al., 2018).
The contrast agent can shorten the longitudinal and transverse relaxation time of the surrounding hydrogen protons, thus enhancing the signal contrast of the focus and improving the detection sensitivity (Shuvaev et al., 2021). MRI contrast media are usually divided into T1W1 and T2W1 (Kanda et al., 2015). Currently, most gadolinium-based T1 contrast agents are used clinically. However, gadolinium-based T1 contrast agents tend to dissociate in vivo, and free gadolinium ions can deposit in the kidneys and central nervous system, causing nephrogenic systemic fibrosis and neurotoxicity (McDonald et al., 2015). Therefore, for patients with renal dysfunction, gadolinium-based contrast agents may aggravate renal toxicity and even cause renal failure. Because of it is reported that iron-based nanoparticles have better biocompatibility than gadolinium-based contrast agents due to its unique magnetism and tiny size (Yang et al., 2012). Neuwelt E A et al. studied the effect of size on IONPs, and the results showed that when the size of ferrite nanoparticles is less than 5 nm, the decrease of magnetic moment can not only suppress the T2 effect, but also enhance the T1 signal effectively, which reflects the high T1 contrast enhancement performance (Neuwelt et al., 2009).
IONPs can be modified with biological material to improve the biocompatibility of the contrast medium. Chee, H et al. designed a short peptide and ligand library for enhancing MRI Biocompatibility, which was used to prepare 86 different peptide-coated ultra miniature superparamagnetic iron oxide nanoparticles (USPION) (Chee et al., 2018). Diphosphopeptide 2 PG-S *VVVT-PEG 4-OL was screened and found to provide the highest biocompatibility and performance for USPION, with no detectable toxicity or adhesion to living cells, and was comparable to commercially available contrast media, the peptide-coated USPION can be used to target the tumor, improve the contrast of the target site, and show better MRI performance (Figure 2). Compared with conventional MRI contrast agents, this kind of contrast agent with iron oxide nanoparticles has a higher overall safety and targeting function.
FIGURE 2. Synthesis process and application of 2PG-S*VVVT-PEG4-ol-coated USPIONs (Chee et al., 2018).
At present, MRI is mainly used to evaluate the prognosis of leukemia and to screen the complications caused by the treatment of leukemia (Mayerhoefer et al., 2020). Intracranial infection is a common central nervous system complication of leukemia. Leukemia patients, especially children, can be infected with microorganisms in the central nervous system due to the damage of immune system, damage of immune system caused by chemotherapy and persistent neutrophils (Lim et al., 2021). Previous intracranial infections were mainly diagnosed by clinical manifestations and laboratory examinations such as cerebrospinal fluid (CSF). Because of the similar clinical characteristics of these central nervous system complications, it is sometimes difficult to make a differential diagnosis by clinical laboratory tests, and the location and extent of the lesions can not be determined by CSF smears (Abdalkader et al., 2019). MRI has some advantages over laboratory tests in leukemia with central nervous system infection. Moreover, MRI can identify the location and extent of the lesion, on the other hand, the infection caused by different pathogenic microorganisms has different imaging features, therefore, MRI can help to diagnose infectious brain lesions caused by leukemia and differentiate other central system diseases (Mayerhoefer et al., 2020). Because of the ultra-small size and specific magnetic properties of iron oxide nanoparticles, iron nanoparticles have great potential as MRI contrast agents in the diagnosis of leukemia-related central system complications.
2.3 Magnetic hyperthermia
Magnetic hyperthermia was proposed by Gilchrist in 1957. On the basis of the research on the destruction of dog’s lymphoma tissues by magnetic materials, it was proved that magnetic materials could move and gather in the tumor tissues in a targeted manner, and generate heat to destroy the tumor tissue under the action of alternating magnetic field (Gilchrist et al., 1957). With the rise of nanotechnology, magnetic hyperthermia is developing constantly. Magnetic hyperthermia is based on the principle that tumor cells are different from normal cells in their tolerance to temperature, under the action of alternating magnetic field, magnetic nanoparticles produce magnetic hysteresis and relaxation, which leads to heat generation. Finally, the temperature in the tissue region is increased, and the tumor cells are destroyed (Carrey et al., 2011). Under the action of alternating magnetic field, magnetic nanoparticles produce hysteresis and relaxation, thus generating heat and increasing the temperature of tissue area (Hergt et al., 2009). The raised temperature range of 43°C–46°C induces injury of tumor cells, which undergo physiological changes leading to their apoptosis/necrosis, while normal cells are not affected (Spirou et al., 2018). At present, there are many researches on Magnetic hyperthermia therapy (MHT) in the field of solid tumor treatment, while there are few studies on MHT in the field of non-solid tumor treatment such as leukemia. Magnetic nanomaterials can be modified to functionalize the surface to target the tumor site (Carter et al., 2021). Several studies suggested that epithelial cell adhesion molecule (Ep-CAM) might be a marker reflecting the epithelial state of primary and systemic tumor cells, and the specific expression of Ep-CAM in leukemia cells could be used as an indicator to measure the metastasis of leukemia tumor cells (Zheng et al., 2017). Kim et al. fixed the antibody of epithelial cell adhesion molecule on the surface of magnetic nanoparticles (MNPs) to realize the specificity to leukemia cells. With EpCAM-MNPs hyperthermia in THP 1 cells and AKR mouse models, leukemic cell numbers were reduced by approximately 40% compared with control samples (Al Faruque et al., 2020). This experiment provides favorable supporting evidence for the treatment of leukemia with magnetic thermotherapy, so magnetic nanoparticles-mediated magnetic thermotherapy has a certain prospect in the treatment of leukemia.
3 Application of iron nanoparticles in leukemia
3.1 Iron-oxide nanoparticles and leukemia diagnosis
Unlike other diseases, based on the malignant proliferation and metastasis of cancer cells, one of the most effective treatments for cancer is to diagnose leukemia as early as possible. Traditional methods rely on the patient’s clinical symptoms, cytomorphology and cytogenetics to diagnose leukemia. However, traditional methods are less sensitive and leukemia cells can not be detected in the early stages of the disease. Therefore, it is necessary to develop a highly selective and sensitive method for the diagnosis of leukemia. Based on the advantages of good selectivity, high sensitivity, simple equipment and low price, biosensors have been used as diagnostic tools in drug detection, biomedical evaluation, environmental monitoring (Sharifi et al., 2019).
Many studies have shown that the application of nanomaterials in traditional biosensors can improve the detection sensitivity, speed and selectivity. The combination of metal oxide nanoparticles and biosensor can not only increase the sensitivity, but also improve the signal-to-noise ratio (Kaushik et al., 2008). Dinani et al. (2022) constructed the first gold nanoparticle/magnetite/reduced graphene oxide (AuNPs/Fe3O4/RGO) adapter sensor for detecting the concentration of the leukemia biomarker miRNA-128. The electrical conductivity and the sensitivity of the sensor have been improved by this nanocomposite. Therefore, the quantitative determination of miRNA-128 by the biosensor is realized for the first time, which can be applied to the diagnosis and prognosis of acute lymphocyte leukemia (ALL). Because of the specific expression of miRNA-128 in ALL, the sensor can also be used for differential diagnosis of different types of leukemia, especially with AML, in which miRNA-128 is not expressed. (Figure 3).
FIGURE 3. To confirm the high selectivity of the biosensor, besides miRNA-128, this biosensor was also documented for four other biomolecules that are in concentration in healthy humans, including LPS aptamer, glucose, PSA and BSA (Dinani et al., 2022).
Fe3O4 nanomaterials as metal oxide nanomaterials can increase the active surface area of the electrode surface and the electron transfer rate of redox, which leads to higher catalytic activity. Sgc8c linker can specifically bind to PTK7 which overexpresses in leukemia cells (Liu et al., 2019). Khoshfetrat and Mehrgardi (2017) first fixed the thiogenated sgc8c junction on the magnetic Fe3O4 nanoparticles (Apt-GMNPs) coated with gold nanoparticles, and then used N-doped graphene nanoplates as the detection electrode, an electrochemical joint sensor was successfully constructed to detect the selectivity and sensitivity of leukemic cells. It is reported that nitrogen-doped graphene had larger functional surface area, more active sites catalytic reactions and higher conductivity compared with graphene nanosheet (Wen et al., 2014). Moreover, gold coated MNPs as a separation tool have ability to decrease the signal-to-noise ratio in complex media. The unique magnetism of MNPs can be used not only in biosensors, but also in combination with gene detection technology to improve the sensitivity of leukemia detection (Manthawornsiri et al., 2016).
Recently, Magnetic separation technology has been discovered and applied to separate substances under magnetic field. Compared with other separation methods, such as centrifugation, electrophoresis and ultrafiltration, the advantages of magnetic separation involved of high specificity, mild reaction conditions, simple operation and low cost (Liu et al., 2020). In 1973, Fe3O4 NPs were firstly applied to the field of biological magnetic separation by Robinson et al. (1973). Nowadays, Fe3O4 NPs have been widely used in the separation of biological macromolecules such as cells, pathogens, nucleic acids and proteins (You et al., 2019). Rashid et al. (2020) prepared Fe3O4 NPs by coprecipitation, and coated the nanoparticles with SiO2. Finally, Fe3O4@SiO2 was functionalized to obtain Fe3O4@SiO2@PMIDA MNP. The nanocomposite is not only simple and inexpensive to fabricate, but also selectively isolates CD4+ T lymphocytes from human peripheral blood. Quynh et al. (2018) developed a novel Fe3O4/AG nanocomposite with core-shell structure and coupled anti-CD34 antibody to magnetic nanoparticles, which can collect CD34 + stem cells from bone marrow samples with high selectivity. The above researches on the application of magnetic separation in the separation of cells, which indicated that it is promising for the diagnosis of leukemia via magnetic separation technology.
3.2 Iron-oxide nanoparticles and leukemia treatment
3.2.1 Improve the bioavailability of drugs
It is suggested that oral administration might be often regarded as common administration routes for the treatment of hematologic tumors (Liu, 2021). However, due to low water solubility and low oral absorption of most therapeutic drugs, it is necessary to increase the oral dose of cytotoxic drugs in order to enhance the blood concentration of drugs, which also causing damage of normal cells to a certain extent (Kantarjian et al., 2021). Therefore, it is important to discover a method to improve the bioavailability of drugs.
Homoharringtonine (HHT) can induce apoptosis by activating Caspase-3 and decreasing the expression of BCL-2, which can be used in tyrosine-kinase inhibitor myeloid leukemia (Chen et al., 2019). However, poor water solubility and serious adverse reactions limit its clinical application. In order to improve the bioavailability of HHT and reduce the adverse reactions, HHT-MNP-Fe3O4 nanoparticles were prepared as drug delivery nanoparticles (Li et al., 2020). The results showed that HHT delivered by MNP-Fe3O4 could not only inhibit the growth of myeloid leukemia cell, but also inhibit the proliferation of leukemia cells in vivo and in vitro, and induce apoptosis of leukemia cells on a wider range. The reason why HHT-MNP-Fe3O4 can improve the curative effect may be that the magnetic nanoparticles downregulate the expression of myeloid leukemia-1, inhibit the activation of cal-pain I and poly-ADP- ribose polymerase, and thus induce apoptosis of leukemia cells. Like HHT, genistein has anti-tumor potential. However, due to its poor water solubility, the effective doses of genistein will have more side effects when used to treat blood tumors. Chouhan et al. (2021); Ghasemi Goorbandi et al. (2020) prepared Fe3O4-CMC-genistein by covalently modifying Fe3O4 nanoparticles with Genistein. This study showed that the release rate of the synthesized Fe3O4-CMC-genistein was very slow, and compared with genistein, the synthesized Fe3O4-CMC- genistein showed a higher inhibition rate, especially at 72 h.
Most chemotherapeutic drugs used to treat leukemia have a short half-life and therefore do not reach effective therapeutic concentrations in the bloodstream for long enough to produce a lasting therapeutic effect. For example, the half-life of a chlorambucil is only 1–2 h, and the half-life of a mercaptopurine is 90 min (Sang et al., 2022). Fe3O4 nanoparticles can overcome this disadvantage. Chemotherapeutic drugs are encapsulated in nanoparticles to slow or control drug release and thereby improve drug bioavailability. Chloramb is used as an alkylating agent in the chemotherapy of chronic lymph leukemia (CLL) and chronic myeloid leukemia (CML). CS-IONPs with core-shell structure were prepared by Hussein-Al-Ali et al. (2021) Chloramb-CS-IONPs were synthesized by ionic gelation method using CS-IONPs as carriers of chlorambucil with 19% loading rate of chloramb. In this study, Chloramb-loaded IONPs reduced cancer cell viability in a leukemia cell line (WEHI) better than Chloramb. Furthermore, the release of Chloramb from the drug-loaded complex has proved to be a controlled release behavior. Chloramb-CS-IONPs provided a new way to improve the bioavailability of chloramphenylene, thus providing a new idea for the treatment of leukemia with Chloramb. Dorniani et al. (2014) used a co-precipitation method to mercaptopurine iron oxide nanoparticles coated with PEG. By simulating the pH of the stomach and blood, the drug-release behavior of the nanoparticles is controlled, thus the anti-leukemia effect of WEHI-3B can be maintained.
3.2.2 Improve the efficiency of treatment
The clinical use of systemic chemotherapy for leukemia is often hampered by cancer cells and the multiple drug resistance of anticancer drugs. The process of multidrug resistance (MDR) development is very complex, which is related to transporter overexpression, enhanced xenobiotics metabolism, DNA repair ability changes, genetic factors and so on Bukowski et al. (2020). Nano-agents will play an important role in the treatment of multi-drug resistant tumors because they can not only carry multiple chemotherapeutic agents and bioactive components, but also overcome multiple mechanisms of MDR.
To reverse MDR and minimize serious adverse effects of systemic chemotherapy, Wang et al. (2011) used oleic acid-coated IONPs as a co-delivery vehicle for DNR and Br Tet, named DNR/Br Tet-MNPs. The effect of the drug-loaded nanoparticles on the apoptosis of drug-resistant human leukemia K562/A02 cells was studied. The study showed that DNR/Br Tet-MNPs could deliver DNR to drug-resistant cells better than DNR and Br Tet Solution. The reason may be that the drug-loaded nanoparticles decrease the expression of BCL-2 and increase the expression of Caspase 3, thus increasing the apoptosis of drug-resistant leukemia cells.
Doxorubicin (DOX) is a commonly used drug to treat acute leukemia, but its application is limited because of drug resistance. Studies have shown that over-expression of NPM can lead to multidrug resistance of ALL, and the engineered recombinant NPM binding protein (NPMBP) can knock out NPM by RNA interference, thus reversing multidrug resistance of leukemia cells (Wang et al., 2015). Gan D and his colleagues (Gan et al., 2021) assembled DOX and NPMBP into polymer nanomicelles called DOX-PMs-NPMBP. Compared with DOX, DOX-PMs-NPMBP could increase the drug retention capacity of DOX-resistant cells and induce G0/G1 phase arrest of drug-resistant cells, thus achieving a more significant anti-leukemia effect. In addition, the study showed that the multidrug resistance mechanism of DOX-PMs-NPMBP nanoparticles system was proved by the Rho123 outflow test by regulating the functional activity of P-glycoprotein (P-gp). Overexpression of P-gp in drug-resistant cells increases drug efflux, resulting in a decrease in intracellular drug concentration. The new DOX-PMs-NPMBP nanoparticle system can significantly regulate the functional activity of P-gp, thus reducing the efflux of Rho123 mediated by drug pump P-gp in drug-resistant ALL cells (Figure 4). These results suggest that the classical MDR phenotype-dependent mechanism is involved in the effect of DOX-PMs-NPMBP on DOX-resistant cells.
FIGURE 4. DOX-PMs-NPMBP promotes the intracellular retention of DOX in DOX-resistant cells. (A) The intracellular retention of DOX was assessed by flow cytometry in Nalm6/DOX cells after different treatments. (B) The MFI of Rhodamine123in Nalm123/ADR cells was assessed by flow cytometry analysis through FITC channels (Gan et al., 2021).
IONPs can trigger the Fenton reaction, a chemical reaction in which divalent and/or ferric can convert hydrogen peroxide into hydroxyl radicals. The Fenton reaction produces reactive oxygen species (ROS) and mediates lipid peroxidation, which can lead to ferroptosis. Shen et al. (2018) Ferroptosis, discovered and named by Dixon et al. (2012), is a new form of iron-dependent cell death that differs from apoptosis, cell necrosis, and autophagy (Figure 5). The biochemical mechanisms of ferroptosis include the production of lethal ROS, lipid peroxidation and intracellular iron accumulation, which in turn produce large amounts of oxygen free radicals. When the steady-state imbalance of ROS production and degradation occurs, the cell’s own antioxidant capacity decreases to a point where it is not sufficient to clear the excessive accumulation of lipid ROS. Hydroxyl radicals and ROS can attack structures such as DNA, proteins and cell membranes, and thus destroy the structure and function of cells, causing ferroptotic cell death. Chen et al. (2021).
FIGURE 5. Mechanism of action of iron death (Dixon et al., 2012).
Trujillo-Alonso et al. (2019) found that iron oxide nanoparticles approved by the FDA for the treatment of iron deficiency can be used to treat leukemia with low ferroportin (FPN) expression. Iron oxide nanoparticles can aggravate the reduction of cellular iron efflux and increase intracellular iron content, thus aggravating the increase of intracellular ROS level. Because FPN is highly expressed in normal hematopoietic cells, and iron oxide nanoparticles do not cause severe toxic and side effects in normal hematopoietic cells. Therefore, iron oxide nanoparticles are relatively safe in the treatment of this kind of leukemia.
Dou et al. (2021) found that the combination of Fe3O4 nanoparticles with cytarabine (Ara-C) inhibited leukemia stem cell (LSC) more than Ara-C alone. They analyzed changes in ROS-related substances such as gp91-phox and SOD1 by measuring ROS levels in LSC and non-LSC under different conditions. It was demonstrated that IONPs and Ara-C might induce LSC apoptosis due to increased ROS levels. Therefore, iron oxide nanoparticles can regulate the oxidative damage and defense balance of cells through the mechanism of iron death, which has a great prospect in the treatment of leukemia.
4 Conclusion and prospects
With the development of medical science and technology, the traditional way of drug delivery will be innovated. Due to the convenience and biocompatibility of IONPs, it has a broad application prospects in clinical transformation. The rapid development of nanotechnology has laid a solid foundation for the diagnosis and treatment of leukemia, and more and more application of IONPs in the treatment of leukemia. Furthermore, IONPs are widely used in tumor imaging, magnetic hyperthermia and biomacromolecule magnetic separation because of their magnetic properties. More importantly, IONPs can not only achieve synergistic drug delivery, but also combine with other therapeutic methods to achieve better therapeutic effects, which has become one of the hot research directions.
However, the application of iron oxide nanoparticles in the diagnosis and treatment of leukemia still needs to overcome huge obstacles in the clinical transformation process. 1) At present, there is still a lack of high-yield and high-safety methods for the preparation of iron oxide nanoparticles. Although some modified materials have been studied, the synthetic standard of modified materials and whether other new materials can be used for modification are still an urgent problem to be solved. 2) Lack of detailed toxicity test results of iron oxide nanoparticles. Although iron oxide nanoparticles are biocompatible compared to other materials, the long-term side effects of iron oxide nanoparticles on normal cells, tissues and organs need to be further determined, and carefully study the metabolism of this material and degradation of the impact on the body. 3) The detailed mechanism of iron oxide nanoparticles involved in regulating the metabolism of leukemic cells is not completely clear. 4) For the application of IONPs in the treatment of leukemia, most of current studies are devoted to the examination of the drug-carrying function of IONPs, and there are fewer applications regarding the magnetic properties of IONPs, such as magnetic hyperthermia and magnetic separation. 6) The clinical transformation of iron oxide nanoparticles in leukemia has been very slow, and only a small number of studies have been carried out in clinical trials. 7) The design of iron oxide nanoparticles with imaging, diagnosis and therapy, and the realization of multi-treatment of leukemia, may be one of the hot research directions in the future.
These questions may inspire future research into the development and improvement of IONPs, providing better opportunities for the treatment of leukemia. In summary, combining multidisciplinary knowledge and research tools to explore effective therapies for leukemia and develop highly biocompatibility, highly targeted iron oxide nanoparticles will be the focus. It is believed that with the joint efforts of researchers, IONPs may be further applied in the clinical treatment of leukemia.
Author contributions
YZ conceived and designed the current study. YW and YY search and summarize the data. XZ, JS and XD analyzed the data. YW and YY drafted the manuscript. All authors have read and approved the final manuscript.
Funding
This work was supported by the Research Program of the Science and Technology Department of Sichuan Province (2022NSFSC0630); Research Program of the Science and Technology Department of Chengdu (2021-YF05-01034-SN); Open Project of Central Nervous System Drug Key Laboratory of Sichuan Province (230015-01SZ); Research Program of Science and Technology Department of Sichuan Province (2021YJ0189); National Key Research and Development Program of China (2020YFC2005500).
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
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Keywords: leukemia, iron oxide nanoparticles, magnetism, drug delivery, targeted therapy
Citation: Wang Y, Yang Y, Zheng X, Shi J, Zhong L, Duan X and Zhu Y (2023) Application of iron oxide nanoparticles in the diagnosis and treatment of leukemia. Front. Pharmacol. 14:1177068. doi: 10.3389/fphar.2023.1177068
Received: 01 March 2023; Accepted: 20 March 2023;
Published: 30 March 2023.
Edited by:
Qin Wang, Southwest Jiaotong University, ChinaReviewed by:
Sanjun Shi, Chengdu University of Traditional Chinese Medicine, ChinaZhi-Xiang Yuan, Southwest Minzu University, China
Qing Lin, Sichuan University, China
Copyright © 2023 Wang, Yang, Zheng, Shi, Zhong, Duan and Zhu. 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: Yuxuan Zhu, zhuyuxuan6688@163.com
†These authors contributed equally to this work