1
|
Zhang T, Zhang X, Chen J, Zhang X, Zhang Y. Harnessing microbial antigens as cancer antigens: a promising avenue for cancer immunotherapy. Front Immunol 2024; 15:1411490. [PMID: 39139570 PMCID: PMC11319170 DOI: 10.3389/fimmu.2024.1411490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Accepted: 07/16/2024] [Indexed: 08/15/2024] Open
Abstract
Immunotherapy has revolutionized cancer treatment by leveraging the immune system's innate capabilities to combat malignancies. Despite the promise of tumor antigens in stimulating anti-tumor immune responses, their clinical utility is hampered by limitations in eliciting robust and durable immune reactions, exacerbated by tumor heterogeneity and immune evasion mechanisms. Recent insights into the immunogenic properties of host homologous microbial antigens have sparked interest in their potential for augmenting anti-tumor immunity while minimizing off-target effects. This review explores the therapeutic potential of microbial antigen peptides in tumor immunotherapy, beginning with an overview of tumor antigens and their challenges in clinical translation. We further explore the intricate relationship between microorganisms and tumor development, elucidating the concept of molecular mimicry and its implications for immune recognition of tumor-associated antigens. Finally, we discuss methodologies for identifying and characterizing microbial antigen peptides, highlighting their immunogenicity and prospects for therapeutic application.
Collapse
Affiliation(s)
- Tao Zhang
- Department of Respiratory and Critical Care Medicine, The Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, China
- Department of Biomedical Engineering, School of Biomedical Engineering and Informatics, Nanjing Medical University, Nanjing, China
| | - Xilong Zhang
- Department of Burns and Plastic Surgery, First People’s Hospital of Xuzhou City, Xuzhou, China
| | - Jianquan Chen
- Central Laboratory, Translational Medicine Research Center, The Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, China
| | - Xiuwei Zhang
- Department of Burns and Plastic Surgery, First People’s Hospital of Xuzhou City, Xuzhou, China
| | - Yunlei Zhang
- Department of Respiratory and Critical Care Medicine, The Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, China
- Department of Biomedical Engineering, School of Biomedical Engineering and Informatics, Nanjing Medical University, Nanjing, China
- Central Laboratory, Translational Medicine Research Center, The Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, China
| |
Collapse
|
2
|
Xie D, Huang L, Li C, Wu R, Zheng Z, Liu F, Cheng H. Identification of PANoptosis-related genes as prognostic indicators of thyroid cancer. Heliyon 2024; 10:e31707. [PMID: 38845990 PMCID: PMC11153176 DOI: 10.1016/j.heliyon.2024.e31707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 04/24/2024] [Accepted: 05/21/2024] [Indexed: 06/09/2024] Open
Abstract
Background Thyroid cancer (THCA) has become a common malignancy in recent years, with the mortality rate steadily increasing. PANoptosis is a unique kind of programmed cell death (PCD), including pyroptosis, necroptosis, and apoptosis, and is involved in the proliferation and prognosis of numerous cancers. This paper demonstrated the connection between PANoptosis-related genes and THCA based on the analyses of Gene Expression Omnibus (GEO) and The Cancer Genome Atlas (TCGA) databases, which have not been evaluated yet. Methods We identified PANoptosis-related differentially expressed genes (PRDEGs) by multi-analyzing the TCGA-THCA and GEO datasets. To identify the significant PRDEGs, a prognostic model was constructed using least absolute shrinkage and selection operator regression (LASSO). The predictive values of the significant PRDEGs for THCA outcomes were determined using Cox regression analysis and nomograms. Gene enrichment analyses were performed. Finally, immunohistochemistry was carried out using the human protein atlas. Results A LASSO regression model based on nine PRDEGs was constructed, and the prognostic value of key PRDEGs was explored via risk score. Univariate and multivariate Cox regression were implemented to identify further three significant PRDEGs closely related to distant metastasis, lymph node metastasis, and tumor stage. Then, a nomogram was constructed, which presented high predictive accuracy for 5 years survival of THCA patients. Gene enrichment analyses in THCA were strongly associated with PCD pathways. CASP6 presented significantly differential expression during clinical T stage, N stage, and PFI events (P < 0.05 for all) and demonstrated the highest degree of diagnostic efficacy in PRDEGs (HR: 2.060, 95 % CI: 1.170-3.628, P < 0.05). Immunohistochemistry showed CASP6 was more abundant in THCA tumor tissue. Conclusion A potential prognostic role for PRDEGs in THCA was identified, providing a new direction for treatment. CASP6 may be a potential therapeutic target and a novel prognostic biomarker for THCA.
Collapse
Affiliation(s)
- Diya Xie
- Department of General Surgery, First General Hospital of Fuzhou Affiliated of Fujian Medical University, Fuzhou, Fujian Province, China
| | - Liyong Huang
- Department of General Surgery, First General Hospital of Fuzhou Affiliated of Fujian Medical University, Fuzhou, Fujian Province, China
| | - Cheng Li
- Department of General Surgery, First General Hospital of Fuzhou Affiliated of Fujian Medical University, Fuzhou, Fujian Province, China
| | - Ruozhen Wu
- Department of Gastrointestinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian Province, China
| | - Zhigang Zheng
- Department of General Surgery, First General Hospital of Fuzhou Affiliated of Fujian Medical University, Fuzhou, Fujian Province, China
| | - Fengmin Liu
- Department of Endocrinology, First General Hospital of Fuzhou Affiliated of Fujian Medical University, Fuzhou, Fujian Province, China
| | - Huayong Cheng
- Department of General Surgery, First General Hospital of Fuzhou Affiliated of Fujian Medical University, Fuzhou, Fujian Province, China
| |
Collapse
|
3
|
Jia J, Wang X, Lin X, Zhao Y. Engineered Microorganisms for Advancing Tumor Therapy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2313389. [PMID: 38485221 DOI: 10.1002/adma.202313389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 02/27/2024] [Indexed: 03/23/2024]
Abstract
Engineered microorganisms have attracted significant interest as a unique therapeutic platform in tumor treatment. Compared with conventional cancer treatment strategies, engineering microorganism-based systems provide various distinct advantages, such as the intrinsic capability in targeting tumors, their inherent immunogenicity, in situ production of antitumor agents, and multiple synergistic functions to fight against tumors. Herein, the design, preparation, and application of the engineered microorganisms for advanced tumor therapy are thoroughly reviewed. This review presents a comprehensive survey of innovative tumor therapeutic strategies based on a series of representative engineered microorganisms, including bacteria, viruses, microalgae, and fungi. Specifically, it offers extensive analyses of the design principles, engineering strategies, and tumor therapeutic mechanisms, as well as the advantages and limitations of different engineered microorganism-based systems. Finally, the current challenges and future research prospects in this field, which can inspire new ideas for the design of creative tumor therapy paradigms utilizing engineered microorganisms and facilitate their clinical applications, are discussed.
Collapse
Affiliation(s)
- Jinxuan Jia
- Department of Gastrointestinal Surgery, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, China
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
- National Center for International Research of Bio-targeting Theranostics, Guangxi Key Laboratory of Bio-targeting Theranostics, Guangxi Medical University, Nanning, Guangxi, 530021, China
| | - Xiaocheng Wang
- Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325001, China
| | - Xiang Lin
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
- Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325001, China
| | - Yuanjin Zhao
- Department of Gastrointestinal Surgery, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, 325035, China
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
- Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325001, China
| |
Collapse
|
4
|
Zhang Y, Akhil V, Seo HS, Park HR, Kim SH, You SH, Liu Z, Kim SY, Sultonova RD, Min JJ, Hong Y. The combination of calreticulin-targeting L-ASNase and anti-PD-L1 antibody modulates the tumor immune microenvironment to synergistically enhance the antitumor efficacy of radiotherapy. Theranostics 2024; 14:1195-1211. [PMID: 38323311 PMCID: PMC10845202 DOI: 10.7150/thno.90376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 12/30/2023] [Indexed: 02/08/2024] Open
Abstract
Radiotherapy (RT) triggers immunogenic cell death (ICD). L-ASNase, which catalyzes the conversion of asparagine (Asn), thereby depleting it, is used in the treatment of blood cancers. In previous work, we showed that CRT3LP and CRT4LP, PASylated L-ASNases conjugated to the calreticulin (CRT)-specific monobodies CRT3 and CRT4, increase the efficacy of ICD-inducing chemotherapy. Here, we assessed their efficacy in tumor-bearing mice treated with RT. Methods: Monobody binding was evaluated by in silico molecular docking analysis. The expression and cellular localization of ecto-CRT were assessed by confocal imaging and flow cytometry. The antitumor effect and the roles of CRT3LP and CRT4LP in irradiation (IR)-induced ICD in tumors were analyzed by ELISA, immunohistochemistry, and immune analysis methods. Results: Molecular docking analysis showed that CRT3 and CRT4 monobodies were stably bound to CRT. Exposure to 10 Gy IR decreased the viability of CT-26 and MC-38 tumor cells in a time-dependent manner until 72 h, and increased the expression of the ICD marker ecto-CRT (CRT exposed on the cell surface) and the immune checkpoint marker PD-L1 until 48 h. IR enhanced the cytotoxicity of CRT3LP and CRT4LP in CT-26 and MC-38 tumor cells, and increased reactive oxygen species (ROS) levels. In mice bearing CT-26 and MC-38 subcutaneous tumors treated with 6 Gy IR, Rluc8-conjugated CRT-specific monobodies (CRT3-Rluc8 and CRT4-Rluc8) specifically targeted tumor tissues, and CRT3LP and CRT4LP increased total ROS levels in tumor tissues, thereby enhancing the antitumor efficacy of RT. Tumor tissues from these mice showed increased mature dendritic, CD4+ T, and CD8+ T cells and pro-inflammatory cytokines (IFNγ and TNFα) and decreased regulatory T cells, and the expression of tumor cell proliferation markers (Ki67 and CD31) was downregulated. These data indicate that the combination of IR and CRT-targeting L-ASNases activated and reprogramed the immune system of the tumor microenvironment. Consistent with these data, an immune checkpoint inhibitor (anti-PD-L1 antibody) markedly increased the therapeutic efficacy of combined IR and CRT-targeting L-ASNases. Conclusion: CRT-specific L-ASNases are useful as additive drug candidates in tumors treated with RT, and combination treatment with anti-PD-L1 antibody increases their therapeutic efficacy.
Collapse
Affiliation(s)
- Ying Zhang
- Institute for Molecular Imaging and Theranostics, Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Jeollanam-do, Republic of Korea
- Current affiliation: State Key Laboratory of Drug Research, Molecular Imaging Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Venu Akhil
- Institute for Molecular Imaging and Theranostics, Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Jeollanam-do, Republic of Korea
| | - Ho Seong Seo
- Research Division for Radiation Science, Korea Atomic Energy Research Institute, Jeollabuk-do, Republic of Korea
| | - Hae Ran Park
- Research Division for Radiation Science, Korea Atomic Energy Research Institute, Jeollabuk-do, Republic of Korea
| | - Soo Hyun Kim
- Department of Microbiology, Chonnam National University Medical School, Jeollanam-do, Republic of Korea
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Sung-Hwan You
- Institute for Molecular Imaging and Theranostics, Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Jeollanam-do, Republic of Korea
- CNCure Biotech, Inc., Jeollanam-do, Republic of Korea
| | - Zhipeng Liu
- Brain Tumor Research Laboratory, Biomedical Research Institute, Chonnam National University Hwasun Hospital, Jeollanam-do, Republic of Korea
| | - So-young Kim
- Institute for Molecular Imaging and Theranostics, Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Jeollanam-do, Republic of Korea
- CNCure Biotech, Inc., Jeollanam-do, Republic of Korea
| | - Rukhsora D. Sultonova
- Institute for Molecular Imaging and Theranostics, Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Jeollanam-do, Republic of Korea
- New Uzbekistan University, Tashkent, Uzbekistan
- Republican Oncology Research Center Tashkent Region Branch, Tashkent, Uzbekistan
| | - Jung-Joon Min
- Institute for Molecular Imaging and Theranostics, Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Jeollanam-do, Republic of Korea
- CNCure Biotech, Inc., Jeollanam-do, Republic of Korea
| | - Yeongjin Hong
- Institute for Molecular Imaging and Theranostics, Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Jeollanam-do, Republic of Korea
- Department of Microbiology, Chonnam National University Medical School, Jeollanam-do, Republic of Korea
- CNCure Biotech, Inc., Jeollanam-do, Republic of Korea
| |
Collapse
|
5
|
Lim D, Kim K, Duysak T, So E, Jeong JH, Choy HE. Bacterial cancer therapy using the attenuated fowl-adapted Salmonella enterica serovar Gallinarum. Mol Ther Oncolytics 2023; 31:100745. [PMID: 38053546 PMCID: PMC10694566 DOI: 10.1016/j.omto.2023.100745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023] Open
Abstract
We report here a novel anti-cancer therapy based on an avian-host-specific serotype Salmonella enterica serovar Gallinarum (S. Gallinarum) deficient in ppGpp synthesis. To monitor the tumor targeting, a bioluminescent ΔppGpp S. Gallinarum was constructed and injected intravenously into mice bearing syngeneic and human xenograft tumors. Strong bioluminescent signals were detected specifically in all grafted tumors at 2 days post-injection (dpi). The bacterial counts in normal and tumor tissue at 1 dpi revealed that ΔppGpp S. Gallinarum reached >108 CFU/g in tumor tissue and 106-107 CFU/g in endothelial organs; counts were much lower in other organs. At 16 dpi, ΔppGpp S. Gallinarum counts in tumor tissue decreased to ∼106 CFU/g, while those in the other organs became undetectable. A strong anti-cancer effect was observed after the injection of ΔppGpp S. Gallinarum into BALB/c mice grafted with CT26 colon cancer cells. This could be attributed to reduced virulence, which allowed the administration of at least a 10-fold greater dose (108 CFU) of ΔppGpp S. Gallinarum than other attenuated strains of S. enterica serovar Typhimurium (≤107 CFU). An advantage of the avian-specific S. Gallinarum as a cancer therapeutic should be a reduced capacity to cause infections or harm in humans.
Collapse
Affiliation(s)
- Daejin Lim
- Division of Biomedical Convergence, College of Biomedical Science, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Kwangsoo Kim
- Odysseus Bio, Basic Medical Research Building, Chonnam National University Medical College, 322 Seoyangro, Hwasun, Jeonnam 58128, Republic of Korea
- Department of Microbiology, Chonnam National University Medical School, Gwangju 61468, Republic of Korea
| | - Taner Duysak
- Department of Microbiology, Chonnam National University Medical School, Gwangju 61468, Republic of Korea
| | - EunA. So
- Department of Microbiology, Chonnam National University Medical School, Gwangju 61468, Republic of Korea
| | - Jae-Ho Jeong
- Department of Microbiology, Chonnam National University Medical School, Gwangju 61468, Republic of Korea
| | - Hyon E. Choy
- Odysseus Bio, Basic Medical Research Building, Chonnam National University Medical College, 322 Seoyangro, Hwasun, Jeonnam 58128, Republic of Korea
- Department of Microbiology, Chonnam National University Medical School, Gwangju 61468, Republic of Korea
| |
Collapse
|
6
|
Lv M, Guo S, Zhang X, Zou Y, Chen Q, Zang C, Huang S, Hu Y, Wang Y, Wang Q, Zhong J. Attenuated Salmonella-delivered PD-1 siRNA enhances the antitumor effects of EZH2 inhibitors in colorectal cancer. Int Immunopharmacol 2023; 124:110918. [PMID: 37708707 DOI: 10.1016/j.intimp.2023.110918] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/06/2023] [Accepted: 09/06/2023] [Indexed: 09/16/2023]
Abstract
Immunotherapy has made significant progress in the treatment of malignant tumors. However, strategies to combine immunotherapy with anticancer drugs have attracted great attention due to the low response rate and unique toxicity profile of immunotherapies and the subsequent development of acquired resistance in some initial responders. EZH2, a histone methyl transferase subunit of a Polycomb repressor complex,is highly expressed in a variety of tumors, and targeting EZH2 has become a new strategy for tumor therapy and drug combination. Here,we studied the effect of EZH2 inhibitors on colorectal cancer cells and their combination with immunotherapy. Our results demonstrated that EZH2 inhibitors can not only significantly inhibit the survival of colorectal cancer (CRC) cells and induce apoptosis, effectively inhibit cell invasion and migration, but also cause an increase in the expression of PD-L1 receptors on the cell surface. To determine the effect of EZH2 in combination with immunotherapy, we combine EZH2 inhibitors with PD-1 siRNA delivered by attenuated Salmonella. The vivo experiments have shown that the combination of EZH2 inhibitors and Salmonella-delivered PD-1 siRNA can further inhibit the development of CRC, trigger effective anti-tumor immunity, and improve therapeutic efficacy. Its underlying mechanisms mainly involve synergistic immunomodulation and apoptosis. This study suggests an emerging strategy based on a combination of EZH2 inhibitor and immunotherapy based on PD-1 inhibition.
Collapse
Affiliation(s)
- Mengmeng Lv
- Department of Pathology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan, China; Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China
| | - Sheng Guo
- Institute of Precision Medicine, Xinxiang Medical University, Xinxiang, Henan, China, Xinxiang Key Laboratory of Tumor Vaccine and Immunotherapy, Xinxiang Medical University, Xinxiang, Henan, China
| | - Xinyu Zhang
- Department of Pathology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan, China; Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China
| | - Yan Zou
- Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China
| | - Qiang Chen
- Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China
| | - Chongyi Zang
- Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China
| | - Shuo Huang
- Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China
| | - Yuhan Hu
- Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China
| | - Yanling Wang
- Department of Anesthesiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Qianqing Wang
- Department of Gynecology, Xinxiang Central Hospital, The Fourth Clinical College of Xinxiang Medical University, Xinxiang, Henan, China.
| | - Jiateng Zhong
- Department of Pathology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan, China; Department of Pathology, Xinxiang Medical University, Xinxiang, Henan, China; Department of Gynecology, Xinxiang Central Hospital, The Fourth Clinical College of Xinxiang Medical University, Xinxiang, Henan, China.
| |
Collapse
|
7
|
Zhao X, Xie N, Zhang H, Zhou W, Ding J. Bacterial Drug Delivery Systems for Cancer Therapy: "Why" and "How". Pharmaceutics 2023; 15:2214. [PMID: 37765183 PMCID: PMC10534357 DOI: 10.3390/pharmaceutics15092214] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 08/22/2023] [Accepted: 08/25/2023] [Indexed: 09/29/2023] Open
Abstract
Cancer is one of the major diseases that endanger human health. However, the use of anticancer drugs is accompanied by a series of side effects. Suitable drug delivery systems can reduce the toxic side effects of drugs and enhance the bioavailability of drugs, among which targeted drug delivery systems are the main development direction of anticancer drug delivery systems. Bacteria is a novel drug delivery system that has shown great potential in cancer therapy because of its tumor-targeting, oncolytic, and immunomodulatory properties. In this review, we systematically describe the reasons why bacteria are suitable carriers of anticancer drugs and the mechanisms by which these advantages arise. Secondly, we outline strategies on how to load drugs onto bacterial carriers. These drug-loading strategies include surface modification and internal modification of bacteria. We focus on the drug-loading strategy because appropriate strategies play a key role in ensuring the stability of the delivery system and improving drug efficacy. Lastly, we also describe the current state of bacterial clinical trials and discuss current challenges. This review summarizes the advantages and various drug-loading strategies of bacteria for cancer therapy and will contribute to the development of bacterial drug delivery systems.
Collapse
Affiliation(s)
- Xiangcheng Zhao
- Xiangya School of Pharmaceutical Science, Central South University, Changsha 410006, China; (X.Z.); (N.X.); (H.Z.)
| | - Nuli Xie
- Xiangya School of Pharmaceutical Science, Central South University, Changsha 410006, China; (X.Z.); (N.X.); (H.Z.)
| | - Hailong Zhang
- Xiangya School of Pharmaceutical Science, Central South University, Changsha 410006, China; (X.Z.); (N.X.); (H.Z.)
- Changsha Jingyi Pharmaceutical Technology Co., Ltd., Changsha 410006, China
| | - Wenhu Zhou
- Xiangya School of Pharmaceutical Science, Central South University, Changsha 410006, China; (X.Z.); (N.X.); (H.Z.)
| | - Jinsong Ding
- Xiangya School of Pharmaceutical Science, Central South University, Changsha 410006, China; (X.Z.); (N.X.); (H.Z.)
| |
Collapse
|
8
|
Zhou M, Tang Y, Xu W, Hao X, Li Y, Huang S, Xiang D, Wu J. Bacteria-based immunotherapy for cancer: a systematic review of preclinical studies. Front Immunol 2023; 14:1140463. [PMID: 37600773 PMCID: PMC10436994 DOI: 10.3389/fimmu.2023.1140463] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 03/30/2023] [Indexed: 08/22/2023] Open
Abstract
Immunotherapy has been emerging as a powerful strategy for cancer management. Recently, accumulating evidence has demonstrated that bacteria-based immunotherapy including naive bacteria, bacterial components, and bacterial derivatives, can modulate immune response via various cellular and molecular pathways. The key mechanisms of bacterial antitumor immunity include inducing immune cells to kill tumor cells directly or reverse the immunosuppressive microenvironment. Currently, bacterial antigens synthesized as vaccine candidates by bioengineering technology are novel antitumor immunotherapy. Especially the combination therapy of bacterial vaccine with conventional therapies may further achieve enhanced therapeutic benefits against cancers. However, the clinical translation of bacteria-based immunotherapy is limited for biosafety concerns and non-uniform production standards. In this review, we aim to summarize immunotherapy strategies based on advanced bacterial therapeutics and discuss their potential for cancer management, we will also propose approaches for optimizing bacteria-based immunotherapy for facilitating clinical translation.
Collapse
Affiliation(s)
- Min Zhou
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Yucheng Tang
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Wenjie Xu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Xinyan Hao
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Yongjiang Li
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Si Huang
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Daxiong Xiang
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Junyong Wu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
- Hunan Key Laboratory of Tumor Models and Individualized Medicine, The Second Xiangya Hospital, Changsha, China
| |
Collapse
|
9
|
Zhang Y, Tan W, Sultonova RD, Nguyen DH, Zheng JH, You SH, Rhee JH, Kim SY, Khim K, Hong Y, Min JJ. Synergistic cancer immunotherapy utilizing programmed Salmonella typhimurium secreting heterologous flagellin B conjugated to interleukin-15 proteins. Biomaterials 2023; 298:122135. [PMID: 37148758 DOI: 10.1016/j.biomaterials.2023.122135] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 04/12/2023] [Accepted: 04/26/2023] [Indexed: 05/08/2023]
Abstract
The use of appropriately designed immunotherapeutic bacteria is an appealing approach to tumor therapy because the bacteria specifically target tumor tissue and deliver therapeutic payloads. The present study describes the engineering of an attenuated strain of Salmonella typhimurium deficient in ppGpp biosynthesis (SAM) that could secrete Vibrio vulnificus flagellin B (FlaB) conjugated to human (hIL15/FlaB) and mouse (mIL15/FlaB) interleukin-15 proteins in the presence of L-arabinose (L-ara). These strains, named SAMphIF and SAMpmIF, respectively, secreted fusion proteins that retained bioactivity of both FlaB and IL15. SAMphIF and SAMpmIF inhibited the growth of MC38 and CT26 subcutaneous (sc) tumors in mice and increased mouse survival rate more efficiently than SAM expressing FlaB alone (SAMpFlaB) or IL15 alone (SAMpmIL15 and SAMphIL15), although SAMpmIF had slightly greater antitumor activity than SAMphIF. The mice treated with these bacteria showed enhanced macrophage phenotype shift, from M2-like to M1-like, as well as greater proliferation and activation of CD4+ T, CD8+ T, NK, and NKT cells in tumor tissues. After tumor eradication by these bacteria, ≥50% of the mice show no evidence of tumor recurrence upon rechallenge with the same tumor cells, indicating that they had acquired long-term immune memory. Treatment of mice of 4T1 and B16F10 highly malignant sc tumors with a combination of these bacteria and an immune checkpoint inhibitor, anti-PD-L1 antibody, significantly suppressed tumor metastasis and increased mouse survival rate. Taken together, these findings suggest that SAM secreting IL15/FlaB is a novel therapeutic candidate for bacterial-mediated cancer immunotherapy and that its antitumor activity is enhanced by combination with anti-PD-L1 antibody.
Collapse
Affiliation(s)
- Ying Zhang
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Gwangju, 61469, Republic of Korea; Department of Molecular Medicine (BrainKorea21 Plus), Chonnam National University Graduate School, Gwangju, 61469, Republic of Korea
| | - Wenzhi Tan
- School of Food Science and Bioengineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China
| | - Rukhsora D Sultonova
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Gwangju, 61469, Republic of Korea; Department of Molecular Medicine (BrainKorea21 Plus), Chonnam National University Graduate School, Gwangju, 61469, Republic of Korea
| | - Dinh-Huy Nguyen
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Gwangju, 61469, Republic of Korea; Department of Molecular Medicine (BrainKorea21 Plus), Chonnam National University Graduate School, Gwangju, 61469, Republic of Korea
| | - Jin Hai Zheng
- School of Biomedical Sciences, Hunan University, Changsha, Hunan, 410082, China
| | | | - Joon Haeng Rhee
- Department of Microbiology, Chonnam National University Medical School, Hwasun, 58128, Republic of Korea
| | - So-Young Kim
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Gwangju, 61469, Republic of Korea
| | - Koemchhoy Khim
- Department of Microbiology, Chonnam National University Medical School, Hwasun, 58128, Republic of Korea
| | - Yeongjin Hong
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Gwangju, 61469, Republic of Korea; Department of Microbiology, Chonnam National University Medical School, Hwasun, 58128, Republic of Korea.
| | - Jung-Joon Min
- Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School, Gwangju, 61469, Republic of Korea; Department of Molecular Medicine (BrainKorea21 Plus), Chonnam National University Graduate School, Gwangju, 61469, Republic of Korea; Department of Nuclear Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun, 58128, Republic of Korea.
| |
Collapse
|
10
|
Qin Y, You SH, Zhang Y, Venu A, Hong Y, Min JJ. Genetic Programming by Nitric Oxide-Sensing Gene Switch System in Tumor-Targeting Bacteria. BIOSENSORS 2023; 13:266. [PMID: 36832032 PMCID: PMC9954711 DOI: 10.3390/bios13020266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 02/01/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Recent progress in synthetic biology has enabled bacteria to respond to specific disease signals to perform diagnostic and/or therapeutic tasks. Salmonella enterica subsp. enterica serovar Typhimurium (S. Typhimurium) colonization of tumors results in increases in nitric oxide (NO) levels, suggesting that NO may act as a candidate inducer of tumor-specific gene expression. The present study describes a NO-sensing gene switch system for triggering tumor-specific gene expression in an attenuated strain of S. Typhimurium. The genetic circuit was designed to sense NO via NorR, thus initiating the expression of FimE DNA recombinase. This was found to lead sequentially to the unidirectional inversion of a promoter region (fimS), which induced the expression of target genes. Target gene expression in bacteria transformed with the NO-sensing switch system was triggered in the presence of a chemical source of NO, diethylenetriamine/nitric oxide (DETA/NO) in vitro. In vivo results revealed that the gene expression is tumor-targeted, and specific to NO generated by inducible nitric oxide synthase (iNOS) after S. Typhimurium colonization. These results showed that NO was a promising inducer to finely tune the expression of target genes carried by tumor-targeting bacteria.
Collapse
Affiliation(s)
- Yeshan Qin
- Department of Molecular Medicine, Chonnam National University Graduate School, Gwangju 61469, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Hwasun Hospital, Chonnam National University Medical School, Gwangju 58128, Republic of Korea
| | - Sung-Hwan You
- Institute for Molecular Imaging and Theranostics, Hwasun Hospital, Chonnam National University Medical School, Gwangju 58128, Republic of Korea
| | - Ying Zhang
- Department of Molecular Medicine, Chonnam National University Graduate School, Gwangju 61469, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Hwasun Hospital, Chonnam National University Medical School, Gwangju 58128, Republic of Korea
| | - Akhil Venu
- Institute for Molecular Imaging and Theranostics, Hwasun Hospital, Chonnam National University Medical School, Gwangju 58128, Republic of Korea
| | - Yeongjin Hong
- Department of Microbiology, Chonnam National University Medical School, Gwangju 58128, Republic of Korea
| | - Jung-Joon Min
- Department of Molecular Medicine, Chonnam National University Graduate School, Gwangju 61469, Republic of Korea
- Institute for Molecular Imaging and Theranostics, Hwasun Hospital, Chonnam National University Medical School, Gwangju 58128, Republic of Korea
- Department of Nuclear Medicine, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
| |
Collapse
|
11
|
Al-Saafeen BH, Al-Sbiei A, Bashir G, Mohamed YA, Masad RJ, Fernandez-Cabezudo MJ, al-Ramadi BK. Attenuated Salmonella potentiate PD-L1 blockade immunotherapy in a preclinical model of colorectal cancer. Front Immunol 2022; 13:1017780. [PMID: 36605208 PMCID: PMC9807881 DOI: 10.3389/fimmu.2022.1017780] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 11/24/2022] [Indexed: 12/24/2022] Open
Abstract
The use of immune checkpoint inhibitors to treat cancer resulted in unprecedented and durable clinical benefits. However, the response rate among patients remains rather modest. Previous work from our laboratory demonstrated the efficacy of using attenuated bacteria as immunomodulatory anti-cancer agents. The current study investigated the potential of utilizing a low dose of attenuated Salmonella typhimurium to enhance the efficacy of PD-L1 blockade in a relatively immunogenic model of colon cancer. The response of MC38 tumors to treatment with αPD-L1 monoclonal antibody (mAb) was variable, with only 30% of the mice being responsive. Combined treatment with αPD-L1 mAb and Salmonella resulted in 75% inhibition of tumor growth in 100% of animals. Mechanistically, the enhanced response correlated with a decrease in the percentage of tumor-associated granulocytic cells, upregulation in MHC class II expression by intratumoral monocytes and an increase in tumor infiltration by effector T cells. Collectively, these alterations resulted in improved anti-tumor effector responses and increased apoptosis within the tumor. Thus, our study demonstrates that a novel combination treatment utilizing attenuated Salmonella and αPD-L1 mAb could improve the outcome of immunotherapy in colorectal cancer.
Collapse
Affiliation(s)
- Besan H. Al-Saafeen
- Department of Medical Microbiology and Immunology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Ashraf Al-Sbiei
- Department of Biochemistry and Molecular Biology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Ghada Bashir
- Department of Medical Microbiology and Immunology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Yassir A. Mohamed
- Department of Medical Microbiology and Immunology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Razan J. Masad
- Department of Medical Microbiology and Immunology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Maria J. Fernandez-Cabezudo
- Department of Biochemistry and Molecular Biology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates,Zayed Center for Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Basel K. al-Ramadi
- Department of Medical Microbiology and Immunology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates,Zayed Center for Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates,*Correspondence: Basel K. al-Ramadi,
| |
Collapse
|
12
|
Wu LH, Pangilinan CR, Lee CH. Downregulation of AKT/mTOR signaling pathway for Salmonella-mediated autophagy in human anaplastic thyroid cancer. J Cancer 2022; 13:3268-3279. [PMID: 36118522 PMCID: PMC9475365 DOI: 10.7150/jca.75163] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 08/28/2022] [Indexed: 11/05/2022] Open
Abstract
Thyroid cancer has been known as the most common endocrine malignancy. Although majority of thyroid cancer types respond well to conventional treatment including surgery and radioactive iodine therapy, about 10% of those with differentiated thyroid cancer will present distant metastasis and will have persistent or recurrent disease. Even more serious is a rare type of thyroid cancer called anaplastic thyroid cancer (ATC), which accounts for about 1%, has been demonstrated as the most lethal and aggressive form of human malignancy. Unfortunately, these tumors are also frequently resistant to traditional therapy. Previous study have shown that Salmonella inhibits tumor growth, in part, by inducing autophagy - a cellular process that is important in the innate and adaptive immunity in response to viral or bacterial infection. In our study, we intended to investigate whether Salmonella can inhibit tumor growth by inducing autophagy, specifically in thyroid cancer and elucidate the possible molecular mechanism. In order to determine the signaling pathway involved in tumor cell autophagy, we used Salmonella to treat ATC cells line ASH-3 and KMH-2 in vitro. The autophagic markers, particularly autophagy-related gene 6 (Beclin-1), microtubule-associated protein 1A/1B-light chain 3 (LC3) and p62, were observed to be differentially expressed after infection with Salmonella indicating an activated autophagy in ATC cells. In addition, the protein expression levels of phospho-protein kinase B (P-AKT), phospho-mammalian targets of rapamycin (P-mTOR), phospho-p70 ribosomal s6 kinase (P-p70S6K) in tumor cells were decreased after Salmonella infection. In vivo, we also found that substantial cell numbers of Salmonella targeted tumor tissue, and regulated anti-tumor mechanisms. Our findings showed that Salmonella activated autophagic signaling pathway and inhibited ATC tumor growth via downregulation of AKT/mTOR pathway.
Collapse
Affiliation(s)
- Li-Hsien Wu
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Christian R Pangilinan
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Che-Hsin Lee
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.,School of Medicine, College of Medicine, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.,Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 404, Taiwan.,International PhD Program for Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.,Aerosol Science Research Center, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| |
Collapse
|
13
|
Liu X, Guo Y, Sun Y, Chen Y, Tan W, Min JJ, Zheng JH. Comparison of Anticancer Activities and Biosafety Between Salmonella enterica Serovar Typhimurium ΔppGpp and VNP20009 in a Murine Cancer Model. Front Microbiol 2022; 13:914575. [PMID: 35847095 PMCID: PMC9277105 DOI: 10.3389/fmicb.2022.914575] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 05/27/2022] [Indexed: 11/23/2022] Open
Abstract
Salmonella Typhimurium defective in guanosine 5′-diphosphate-3′-diphosphate (ppGpp) synthesis (ΔppGpp) is an attenuated strain with good biosafety and excellent anticancer efficacy. It has been widely applied in preclinical studies of anticancer therapy for various types of solid cancer. VNP20009 is another genetically modified auxotrophic strain with 108-kb deletion, purI−, msbB−, and many single nucleotide polymorphisms (SNPs); it has shown promising therapeutic efficacy in various preclinical tumor models and entered phase I clinical trials. Here, the invasion activities and virulence of ΔppGpp were obviously lower than those of the VNP20009 strain when tested with cancer cells in vitro. In addition, the MC38 tumor-bearing mice showed comparable cancer suppression when treated with ΔppGpp or VNP20009 intravenously. However, the ΔppGpp-treated mice showed 16.7% of complete cancer eradication and prolonged survival in mice, whereas VNP20009 showed higher toxicity to animals, even with equal tumor size individually. Moreover, we found decreased levels of inflammatory cytokines in circulation but strengthened immune boost in tumor microenvironments of ΔppGpp-treated mice. Therefore, the engineered ΔppGpp has high potential for cancer therapeutics, and it is a promising option for future clinical cancer therapy.
Collapse
Affiliation(s)
- Xiaoqing Liu
- School of Biomedical Sciences, Hunan University, Changsha, China
| | - Yanxia Guo
- School of Biomedical Sciences, Hunan University, Changsha, China
| | - Yujie Sun
- School of Biomedical Sciences, Hunan University, Changsha, China
| | - Yu Chen
- School of Biomedical Sciences, Hunan University, Changsha, China
| | - Wenzhi Tan
- School of Biomedical Sciences, Hunan University, Changsha, China
| | - Jung-Joon Min
- Department of Nuclear Medicine, Institute for Molecular Imaging and Theranostics, Chonnam National University Medical School and Hwasun Hospital, Hwasun, South Korea
- Jung-Joon Min,
| | - Jin Hai Zheng
- School of Biomedical Sciences, Hunan University, Changsha, China
- *Correspondence: Jin Hai Zheng,
| |
Collapse
|
14
|
The Evolution and Future of Targeted Cancer Therapy: From Nanoparticles, Oncolytic Viruses, and Oncolytic Bacteria to the Treatment of Solid Tumors. NANOMATERIALS 2021; 11:nano11113018. [PMID: 34835785 PMCID: PMC8623458 DOI: 10.3390/nano11113018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 10/28/2021] [Accepted: 11/01/2021] [Indexed: 02/07/2023]
Abstract
While many classes of chemotherapeutic agents exist to treat solid tumors, few can generate a lasting response without substantial off-target toxicity despite significant scientific advancements and investments. In this review, the paths of development for nanoparticles, oncolytic viruses, and oncolytic bacteria over the last 20 years of research towards clinical translation and acceptance as novel cancer therapeutics are compared. Novel nanoparticle, oncolytic virus, and oncolytic bacteria therapies all start with a common goal of accomplishing therapeutic drug activity or delivery to a specific site while avoiding off-target effects, with overlapping methodology between all three modalities. Indeed, the degree of overlap is substantial enough that breakthroughs in one therapeutic could have considerable implications on the progression of the other two. Each oncotherapeutic modality has accomplished clinical translation, successfully overcoming the potential pitfalls promising therapeutics face. However, once studies enter clinical trials, the data all but disappears, leaving pre-clinical researchers largely in the dark. Overall, the creativity, flexibility, and innovation of these modalities for solid tumor treatments are greatly encouraging, and usher in a new age of pharmaceutical development.
Collapse
|
15
|
Highlights of Immunomodulation in Salmonella-Based Cancer Therapy. Biomedicines 2021; 9:biomedicines9111566. [PMID: 34829795 PMCID: PMC8615479 DOI: 10.3390/biomedicines9111566] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/22/2021] [Accepted: 10/27/2021] [Indexed: 12/24/2022] Open
Abstract
Bacteria-mediated cancer therapy (BMCT) is an emerging tool that may advance potential approaches in cancer immunotherapy, whereby tumors are eradicated by the hosts’ immune system upon recruitment and activation by bacteria such as Salmonella. This paper provides an emphasis on the immunomodulatory effects that encompasses both the innate and adaptive immune responses inherently triggered by Salmonella. Furthermore, modifications of Salmonella-based treatment in the attempt to improve tumor-specific immune responses including cytokine therapy, gene therapy, and DNA vaccine delivery are likewise discussed. The majority of the findings described herein incorporate cell-based experiments and murine model studies, and only a few accounts describe clinical trials. Salmonella-based cancer therapy is still under development; nonetheless, the pre-clinical research and early-phase clinical trials that have been completed so far have shown promising and convincing results. Certainly, the continuous development of, and innovation on, Salmonella-based therapy could pave the way for its eventual emergence as one of the mainstream therapeutic interventions addressing various types of cancer.
Collapse
|