Judun Zheng1†
Xun Long2†Hao Chen3†
Zhisheng Ji4†Bowen Shu1Rui Yue1Yechun Liao2Shengchao Ma5*Kun Qiao6*Ying Liu2*
Yuhui Liao1,5,7*- 1Molecular Diagnosis and Treatment Center for Infectious Diseases, Dermatology Hospital, Southern Medical University, Guangzhou, China
- 2Department of Science and Education, The Third People’s Hospital of Bijie City, Bijie, China
- 3Division of Gastrointestinal Surgery, Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
- 4Department of Orthopedics, The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, China
- 5NHC Key Laboratory of Metabolic Cardiovascular Diseases Research, Ningxia Key Laboratory of Vascular Injury and Repair Research, Ningxia Medical University, Yinchuan, China
- 6Department of Thoracic Surgery, Shenzhen Third People’s Hospital, Shenzhen, China
- 7Department of Infectious Disease, The Fifth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
Tuberculosis (TB) is a virulent form of an infectious disease that causes a global burden due to its high infectivity and fatality rate, especially the irrepressible threats of latent infection. Constructing an efficient strategy for the prevention and control of TB is of great significance. Fortunately, we found that granulomas are endowed with higher reducibility levels possibly caused by internal inflammation and a relatively enclosed microenvironment. Therefore, we developed the first targeted glutathione- (GSH-) responsive theranostic system (RIF@Cy5.5-HA-NG) for tuberculosis with a rifampicin- (RIF-) loaded near-infrared emission carrier, which was constructed by photoclick reaction-actuated hydrophobic-hydrophobic interaction, enabling the early diagnosis of tuberculosis through granulomas-tracking. Furthermore, the loaded rifampicin was released through the dissociation of disulfide bond by the localized GSH in granulomas, realizing the targeted tuberculosis therapy and providing an especially accurate treatment mapping for tuberculosis. Thus, this targeted theranostic strategy for tuberculosis exhibits the potential to realize both granulomas-tracking and anti-infection of tuberculosis.
Introduction
As tuberculosis (TB) is highly contagious, it places a heavy burden on public health worldwide (Pai et al., 2016; Dai et al., 2020; Zwerling, 2020; Daftary et al., 2021; Xu et al., 2021). This chronic disease caused by Mycobacterium tuberculosis (M. tb) most often affects the lungs (Arcos et al., 2017; Rothchild et al., 2019; Fernández-García et al., 2020; Allue-Guardia et al., 2021). Tuberculosis also arises in other organs, including bone and spine, then evolving into one of the most typical forms of extrapulmonary tuberculosis (Pandey et al., 2009; Magnussen et al., 2013; Pigrau-Serrallach and Rodríguez-Pardo, 2013; Rodriguez-Takeuchi et al., 2019). Recently, the surgical intervention accompanied by indispensable anti-tubercular drug therapy is the primary routine treatment (Mukewar et al., 2012; Shrivastava et al., 2019; Moosa et al., 2020; Phillips et al., 2020). Although rifampicin (RIF) and isoniazid have been widely chosen as clinical anti-tubercular drugs due to their excellent effectiveness and reasonable price (Hakkimane et al., 2018; Campbell et al., 2020; Sterling et al., 2020; Villa et al., 2020; Kabir et al., 2021), their short plasma life and relatively low concentration in tuberculosis granulomas and the inescapable side effects of chemotherapeutic drugs have drawn growing attention from interdisciplinary and clinical medicine research circles (Du Toit et al., 2006; Dartois, 2014; Liao et al., 2020). Thus, there is an urgent need to develop an efficient chemotherapy strategy for tuberculosis.
As the typical lesion core of tuberculosis, granuloma formation provides a relatively closed space that could prevent the entrance of anti-tuberculosis drugs (Ramakrishnan, 2012; Ehlers and Schaible, 2013; Bhavanam et al., 2016). Few drugs can penetrate the central regions due to the compact structure of granulomas, and the non-growing bacteria inside the granulomas are inherently recalcitrant to killing by most antibiotics (Datta et al., 2015; Sarathy et al., 2016). The infection of M. tb can remain “silent” throughout an individual’s life but can be reactivated by various conditions to stimulate new bacterial growth and infect new patients, even after decades (Ahmad, 2010; Gengenbacher and Kaufmann, 2012). This is why patients with TB require lengthy multidrug therapy, which would increase the risk of multidrug resistance. On the one hand, nanotechnology, possessing intriguing physicochemical and biophysical properties, such as high surface area-to-volume ratio, multifunctionality and controllable release, simple synthesis methods, and lower eco-toxicity, offers a promising alternative in the theranostics of tumor and neuroscience (Kumar et al., 2017; Feng et al., 2020; Fu et al., 2020). On the other hand, as we reported in ACS Nano (Liao et al., 2020), the granuloma formation possesses the effect of enhanced permeability and retention, which provides the possibility for targeted diagnosis and therapy.
Fortunately, we have found that granulomas are endowed with relatively reducibility levels possibly caused by internal inflammation and relatively enclosed microenvironments (Kiran et al., 2016; Muefong and Sutherland, 2020; Singh et al., 2020). Click chemistry is a powerful linking reaction that is simple to manipulate, possesses high yields, and is versatile in joining diverse structures without the prerequisite of protection steps (Hein et al., 2008; Nwe and Brechbiel, 2009; Zhang et al., 2020; Zheng et al., 2020). In particular, photo-induced tetrazole-based click chemistry has been exploited widely as an efficient tool for site-selective modification or optimization of proteins (Herner and Lin, 2016; Shang et al., 2017; Wu et al., 2019). Therefore, we developed the first targeted glutathione- (GSH-) responsive theranostic system (RIF@Cy5.5-HA-NG) for tuberculosis with a rifampicin- (RIF-) loaded near-infrared emission carrier, which was constructed by photoclick reaction-actuated hydrophobic-hydrophobic interaction, enabling the early diagnosis of tuberculosis through granulomas-tracking (Scheme 1). The constructed GSH-activatable RIF@Cy5.5-HA-NG realized the M. tb-selective imaging, affording precise and effective inhibition of the localized tuberculosis via released RIF for the synergistic treatment of persistent bacteria. This work demonstrated that the rifampicin-loaded GSH-activatable hyaluronic acid (HA) system is a reliable tool for effective tuberculosis therapy.
SCHEME 1. Scheme of photoclick reaction constructing glutathione-responsive theranostic system for anti-tuberculosis. (A) Schematic illustration of the constructing glutathione-responsive theranostic nanoagents for anti-tuberculosis. (B) The photoclick chemical reaction between methacryloyl (MA) and tetrazolium (Tet).
Experimental Section
Materials
1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydro (EDC), N-hydroxy succinimide (NHS), cysteine (Cys), hyaluronic acid (HA), and methacryloyl chloride (MA) were purchased from Aladdin Reagent, Ltd. (Shanghai, China). All chemicals used in this study were of analytical grade, and reagents were used without further purification. Dulbecco’s modified Eagles medium (DMEM) cell culture medium, fetal bovine serum, streptomycin, and penicillin were purchased from Thermo Fisher Scientific Co., Ltd. (China). All aqueous solutions were prepared using ultrapure deionized water (DI water), which was obtained through a Millipore Milli-Q water purification system (Billerica, United States) and had an electric resistance >18.2 MΩ.
Methods
The UV–vis absorption spectra were recorded on a UV–vis spectrometer (Lambda 35 UV–vis spectrometer, Perkin-Elmer, United States) at room temperature. The sizes of micelle nanoparticles were measured using ZEN3690 zetasizer (Malvern instruments, Zetasizer Nano-ZS) at room temperature. The confocal fluorescence images of the cell were collected on a Zeiss Laser Scanning Confocal Microscope (ZEISS LSM 780, Germany). In vivo fluorescence images were captured by the Xenogen IVIS Spectrum system (Caliper Life Sciences, Hopkinton, MA).
The Construction of Granuloma-Bearing Mouse Models
All animal experiments were approved by the Institutional Animal Ethics Committee at Southern Medical University, and the experiments were performed in compliance with the National Institutes of Health (NIH) guidelines for the Care and Use of Laboratory Animals of Southern Medical University. The granuloma-bearing mouse models were in accordance with the previous model reported according to the literature (Carlsson et al., 2010; Oehlers et al., 2015; Fenaroli et al., 2018; Liao et al., 2020). Briefly, female C57BL/6 (B6) mice (8–12 weeks old) were purchased from Guangdong Medical Laboratory Animal Center (Guangdong, China). To establish the granuloma-bearing mouse models, Mycobacterium marinum (M.m) were first grown in 7H9 broth media for 7–10 days in a bacterial shaking incubator. When the mid-log phase (OD600 = 0.7 ± 0.2) was achieved, the bacteria were collected, washed, and then passed 20 times through a needle to disrupt bacterial aggregates. After that, the supernatants were transferred to new tubes and diluted in sterile PBS to a final concentration of 2 × 108 CFU ml-1. Two hundred microliters of the M.m suspension was intravenously injected into mice using an insulin syringe. The bacteria infection-induced tail granulomas were successfully formed after 2 weeks.
Results and Discussion
Preparation of RIF@HA-NG
In order to realize the theranostic effect on tuberculosis, the GSH-responsive nanoagent was rationally designed for targeted imaging and therapy of tuberculosis. RIF@Cy5.5-HA-NG was first synthesized between two types of extensively biocompatible hyaluronic acid (HA) as the host material and near-infrared dye Cy5.5 as a contrast agent via the photo-initiated bioorthogonal reaction and the hydrophilic-hydrophilic interaction. Furthermore, the loaded rifampicin was released through the dissociation of disulfide bonds by the original GSH in granulomas, realizing targeted tuberculosis therapy and providing especially accurate treatment mapping for tuberculosis. Glutathione, as a tripeptide and antioxidant, is synthesized at high levels under intracellular oxidative stress (Aquilano et al., 2014; Zheng et al., 2019a), playing an important role in apoptosis and regulating pathogen-infected-host interaction, including inhibition of M. tuberculosis replication (Seres et al., 2000; Venketaraman et al., 2003; Venketaraman et al., 2005). The resulting system was characterized for GSH-responsive rifampicin release, real-time monitoring, and antibiosis properties. Then, the prolonged retention time of drug-release in vitro and the in vivo was demonstrated using fluorescence imaging techniques.
In this study, HA-Cys-MA and HA-Lys-Tet, which could first form nanocages via UV-induced click reaction, were mixed with rifampicin (RIF) to create a RIF-loaded carrier (RIF@HA-NG). Photo-inducible click chemistry has been widely applied to functionalize and investigate the dynamics and roles of biomolecules in living systems (Le Droumaguet et al., 2010; Zhou et al., 2016; Nainar et al., 2017; Liu et al., 2021). The fluorescent imaging contrast Cy5.5 was then modified on the RIF@HA-NG through amidation in the existence of carbodiimide (EDC) and N-hydroxysuccinimide (NHS) to obtain the aimed nanosystem, which combined the diagnosis and therapy of tuberculosis (Scheme 1). Among them, the synthetic routes of HA-Cys-MA and HA-Lys-Tet are summarized in Supplementary Figures S1, S2, respectively. On the one hand, GSH plays an important role in many diseases, including cancer and tuberculosis (Allen et al., 2015; Zheng et al., 2019b). Moreover, the cysteine (Cys) containing disulfide bond (Yang et al., 2015; Wang et al., 2020) was reasonably chosen to possess the GSH-responsive peculiarity. On the other hand, a polymer pre-monomer containing the photo-click functional groups, including methacryloyl (MA) (Maiti et al., 2020) and tetrazolium (Tet) (Wu et al., 2019; Liu et al., 2021), was designed and synthesized to obtain a controllable nano-delivery system.
Characteristics of RIF@HA-NG
The synthesis of RIF@HA-NG was first characterized by the dynamic light scattering (DLS) analyzer. As shown in Figure 1A, the RIF@HA-NG nanoagent had a hydrodynamic diameter of approximately 120 nm, which was slightly larger than that of HA-NG owning to the RIF loading (Figure 1A). To further confirm the successful loading of RIF, the zeta potentials were measured, showing the zeta potential change from −27.5 to −31.3 mV. In other words, the negative RIF obviously decreased the zeta potential of the nanoagent RIF@HA-NG (Figure 1B). Transmission electron microscopy (TEM) revealed that RIF@HA-NG exhibited a uniform morphology and size with a diameter of 100 nm, indicating that no obvious changes were recorded in the size and shape of the nanoagent after loading RIF (Figure 1C). Meanwhile, the drug-release ability of nanocarriers was assessed, so the RIF release analysis was explored (Figure 1D). Obviously, the ∼55% of the total release was observed within 10 h, and the total release reached ∼70% upon GSH treatment for 70 h. In contrast, the total release reached only ∼20% in PBS solution up to 70 h. In vitro GSH-triggered drug-release analysis indicated that a greater amount of RIF can be released in Mycobacterium-infected macrophage cells. Collectively, these results confirmed that the GSH-responsive water-soluble RIF@HA-NG was successfully synthesized.
FIGURE 1. Characterizations of the RIF@HA-NG. (A) The dynamic light scattering (DLS) analysis of HA-NG and RIF@HA-NG. (B) The zeta potential results of HA-NG and RIF@HA-NG. (C) The transmission electron microscopy (TEM) images of RIF@HA-NG, scale bars are 200 nm. (D) The RIF release of RIF@HA-NG (PBS) in the absence or presence of GSH.
Antibacterial Activity of RIF and RIF@Cy5.5-HA-NG
With the nanoagent in hand, we then aimed to estimate the deliverability of RIF in targeting cells. To determine whether the RIF-loaded nanoagent was endocytosed by the macrophage cell, the RIF@HA-NG was modified by the near-infrared fluorescence dye Cy5.5, simultaneously realizing the imaging of tuberculosis. As shown in Figure 2, the red fluorescence was detected in the RIF@Cy5.5-HA-NG-treated group compared to the Cy5.5-treated group, indicating that RIF@HA-NG can accumulate in the granuloma. That is to say, RIF@HA-NG was successfully modified by Cy5.5. Thus, it can be rationally used to monitor tuberculosis.
FIGURE 2. Uptake of RIF@Cy5.5-HA-NG. Blue fluorescent image indicates the image of DAPI stained cells. Red fluorescence indicates uptake of Cy5.5 and RIF@Cy5.5-HA-NG. Green fluorescent image indicates the image of Actin. To demonstrate the uptake of RIF@Cy5.5-HA-NG nanoparticles, the laser confocal experiment was performed and the section-wise imaging of intracellular localization of nanoparticles was shown.
Owing to the outstanding drug-release properties of RIF@Cy5.5-HA-NG toward GSH-enriched tuberculosis, we then investigated its antibacterial performance. To investigate the antibacterial activity of RIF and RIF@HA-NG in vitro, M. tb-infected M1 macrophage cells were first incubated with RIF and RIF@Cy5.5-HA-NG at different times. Survival analysis was performed to confirm the antibacterial effects of RIF and RIF@Cy5.5-HA-NG. As displayed in Figure 3A, the survival rate of the group treated with RIF@Cy5.5-HA-NG for 1–3 h was lower than that of the RIF-treated group. In particular, RIF@Cy5.5-HA-NG or RIF was co-incubated with cells for 3 h, and the survival rate of bacteria decreased to 28 and 63%, respectively. When the processing time was extended, the bacterial damage caused RIF@Cy5.5-HA-NG to increase, but the survival rate changed gently, which may have been caused by the phytocytosis of macrophages. Meanwhile, the survival analysis of RIF@Cy5.5-HA-NG and RIF treated with Mycobacterium-infected M2 macrophage cells also showed a similar antibacterial tendency, indicating the antibacterial activity of nanoparticles (NPs) was superior to that of pure RIF (Figure 3B). Taken together, these results performed that RIF@Cy5.5-HA-NG NPs have clipping high antibacterial efficiency against cellular bacteria in vitro and therefore hold potential for tuberculosis treatment.
FIGURE 3. Antibacterial activity of RIF and RIF@Cy5.5-HA-NG in vitro. Survival analysis of (A) macrophage cells (M1) and (B) macrophage cells (M2) with RIF and RIF@Cy5.5-HA-NG.
Evaluation of the Antibacterial Activity and Toxicity of the RIF@Cy5.5-HA-NG
Having established that RIF@Cy5.5-HA-NG nanoagent could efficiently kill Mycobacterium, our next goal was to validate its potential to monitor the Mycobacterium-infected mice. First, we established the tuberculosis model by injecting Mycobacterium marinum into the tail vein of mice according to our previously reported methods (Liao et al., 2020). The mice were imaged under a 633 nm laser using the fluorescence in vivo imaging system at different times (0, 6, 12, and 24 h). As exhibited in Figure 4A, the fluorescence intensity at 690 nm in the granuloma region was found to reach the maximum at 24 h, indicating that the concentration of RIF@Cy5.5-HA-NG increased gradually over time and was maintained at a relatively high level even at 24 h after injection. To further investigate the distribution of nanoagent in various organs at 2, 4, and 24 h time points, ex vivo fluorescence imaging was also studied. Intense fluorescence signals at 690 nm were observed in the liver (Figure 4B), which indicated that the nanoagent was preferred to selectively accumulate in the liver. The selective accumulation may be due to the reticuloendothelial system (Zheng et al., 2019; Peng et al., 2017), which indicated that these nanoagents could be metabolized through the liver. Furthermore, hematoxylin and eosin (HE) staining of various important organs revealed no pathological changes after RIF@Cy5.5-HA-NG nanoagents injection at different time points (Figure 4C). Taken together, these results firmly demonstrate that RIF@Cy5.5-HA-NG is capable of directly reflecting tuberculosis, revealing the feasibility of our nanoagent for monitoring the mycobacterium in vivo as an excellent biomaterial.
FIGURE 4. Evaluation of the antibacterial activity and toxicity of the RIF@Cy5.5-HA-NG. (A) Fluorescence imaging of mice at 0, 6, 12, and 24 h after injection. (B) Fluorescence imaging of major organs (liver, spleen, lung, and kidney) collected from animals at 0, 6, 12, and 24 h after injection. (C) Tissue damage analysis of different important organs in mice after intravenous injection of RIF@HA-NG at different times.
Conclusion
In summary, a hybrid material that combined the biocompatible hyaluronic acid and functional agents, including drug rifampicin and Dye Cy5.5, has been constructed and verified as effective mycobacterium tuberculosis-targeting nanoagent for targeted tuberculosis chemotherapy. The GSH-activatable RIF@Cy5.5-HA-NG exhibited not only excellent Mycobacterium tuberculosis targeting selectivity and biocompatibility but also a high anti-tuberculosis effect. Therefore, this study opened up new access to develop the tuberculosis-specific degradable nanomaterials for targeted imaging and therapy of tuberculosis.
Data Availability Statement
The original contributions presented in the study are included in the article/Supplementary Material. Further inquiries can be directed to the corresponding authors.
Ethics Statement
The animal study was reviewed and approved by the Institutional Animal Ethics Committee at Southern Medical University.
Author Contributions
JDZ, XL, YL, and YHL is responsible for the design of the experiment and the writing of the thesis. HC and ZSJ are responsible for data collation and draft the manuscript. ZSJ and KQ is responsible for the animal experiments. JDZ, BWS and RY, SCM, YCL edited and revised the manuscript draft. YL and YHL are responsible for providing funds and unified management of work. All authors read and approved the final manuscript.
Funding
This work was supported by the Science and Technology Foundation of Guizhou Province ((2018)1002), the National Natural Science Foundation of China (81972019, 21904145, and 82102444), Training Project of National Science Foundation for Outstanding/Excellent Young Scholars of Southern Medical University (C620PF0217), China Postdoctoral Science Foundation (2020M682783), Guangdong Basic and Applied Basic Research Foundation (2020A1515010754), Special Fund of Foshan Summit Plan (2020B019 and 2020B012). The Young Scientists Project of the National Key Research and Development Program (2021YFC2302200).
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/fmolb.2022.845179/full#supplementary-material
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Keywords: tuberculosis, theranostic system, photoclick reaction, microenvironment, glutathione
Citation: Zheng J, Long X, Chen H, Ji Z, Shu B, Yue R, Liao Y, Ma S, Qiao K, Liu Y and Liao Y (2022) Photoclick Reaction Constructs Glutathione-Responsive Theranostic System for Anti-Tuberculosis. Front. Mol. Biosci. 9:845179. doi: 10.3389/fmolb.2022.845179
Received: 29 December 2021; Accepted: 10 January 2022;
Published: 14 February 2022.
Edited by:
Mingzhen Zhang, Xi’an Jiaotong University, ChinaReviewed by:
Zheng Zhao, The Chinese University of Hong Kong, Shenzhen, ChinaZhenyu Lin, Fuzhou University, China
Cheng Jiang, University of Oxford, United Kingdom
Copyright © 2022 Zheng, Long, Chen, Ji, Shu, Yue, Liao, Ma, Qiao, Liu and Liao. 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: Shengchao Ma, solarmsc@163.com; Kun Qiao, szqiaokun@163.com; Ying Liu, liuying1036@foxmail.com; Yuhui Liao, liaoyh8@mail.sysu.edu.cn
†These authors have contributed equally to this work