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Zhou Y, Han W, Feng Y, Wang Y, Sun T, Xu J. Microbial metabolites affect tumor progression, immunity and therapy prediction by reshaping the tumor microenvironment (Review). Int J Oncol 2024; 65:73. [PMID: 38847233 PMCID: PMC11173369 DOI: 10.3892/ijo.2024.5661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Accepted: 04/30/2024] [Indexed: 06/12/2024] Open
Abstract
Several studies have indicated that the gut microbiome and tumor microbiota may affect tumors. Emerging metabolomics research illustrates the need to examine the variations in microbial metabolite composition between patients with cancer and healthy individuals. Microbial metabolites can impact the progression of tumors and the immune response by influencing a number of mechanisms, including modulation of the immune system, cancer or immune‑related signaling pathways, epigenetic modification of proteins and DNA damage. Microbial metabolites can also alleviate side effects and drug resistance during chemotherapy and immunotherapy, while effectively activating the immune system to exert tumor immunotherapy. Nevertheless, the impact of microbial metabolites on tumor immunity can be both beneficial and harmful, potentially influenced by the concentration of the metabolites or the specific cancer type. The present review summarizes the roles of various microbial metabolites in different solid tumors, alongside their influence on tumor immunity and treatment. Additionally, clinical trials evaluating the therapeutic effects of microbial metabolites or related microbes on patients with cancer have been listed. In summary, studying microbial metabolites, which play a crucial role in the interaction between the microbiota and tumors, could lead to the identification of new supplementary treatments for cancer. This has the potential to improve the effectiveness of cancer treatment and enhance patient prognosis.
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Affiliation(s)
- Yuhang Zhou
- Department of Breast Medicine 1, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
- Department of Pharmacology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
| | - Wenjie Han
- Department of Breast Medicine 1, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
- Department of Pharmacology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
| | - Yun Feng
- Department of Breast Medicine 1, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
- Department of Pharmacology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
| | - Yue Wang
- Department of Breast Medicine 1, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
- Department of Pharmacology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
| | - Tao Sun
- Department of Breast Medicine 1, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
- Department of Oncology Medicine, Key Laboratory of Liaoning Breast Cancer Research, Shenyang, Liaoning 110042, P.R. China
- Department of Breast Medicine, Cancer Hospital of Dalian University of Technology, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
| | - Junnan Xu
- Department of Breast Medicine 1, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
- Department of Pharmacology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
- Department of Breast Medicine, Cancer Hospital of Dalian University of Technology, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
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Zhang Y, Tang N, Zhou H, Zhu Y. The role of microbial metabolites in endocrine tumorigenesis: From the mechanistic insights to potential therapeutic biomarkers. Biomed Pharmacother 2024; 172:116218. [PMID: 38308969 DOI: 10.1016/j.biopha.2024.116218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 12/28/2023] [Accepted: 01/22/2024] [Indexed: 02/05/2024] Open
Abstract
Microbial metabolites have been indicated to communicate with the host's endocrine system, regulating hormone production, immune-endocrine communications, and interactions along the gut-brain axis, eventually affecting the occurrence of endocrine cancer. Furthermore, microbiota metabolites such as short-chain fatty acids (SCFAs) have been found to affect the tumor microenvironment and boost immunity against tumors. SCFAs, including butyrate and acetate, have been demonstrated to exert anti-proliferative and anti-protective activity on pancreatic cancer cells. The employing of microbial metabolic products in conjunction with radiation and chemotherapy has shown promising outcomes in terms of reducing treatment side effects and boosting effectiveness. Certain metabolites, such as valerate and butyrate, have been made known to improve the efficiency of CAR T-cell treatment, whilst others, such as indole-derived tryptophan metabolites, have been shown to inhibit tumor immunity. This review explores the intricate interplay between microbial metabolites and endocrine tumorigenesis, spanning mechanistic insights to the discovery of potential therapeutic biomarkers.
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Affiliation(s)
- Yiyi Zhang
- Department of Endocrinology, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610072, China
| | - Nie Tang
- Department of Endocrinology, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610072, China
| | - Hui Zhou
- Department of Endocrinology, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610072, China.
| | - Ying Zhu
- Department of Endocrinology, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610072, China.
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Kragsnaes MS, Jensen JRB, Nilsson AC, Malik MI, Munk HL, Pedersen JK, Horn HC, Kruhøffer M, Kristiansen K, Mullish BH, Marchesi JR, Kjeldsen J, Röttger R, Ellingsen T. Dynamics of inflammation-associated plasma proteins following faecal microbiota transplantation in patients with psoriatic arthritis and healthy controls: exploratory findings from the FLORA trial. RMD Open 2024; 10:e003750. [PMID: 38296309 PMCID: PMC10836383 DOI: 10.1136/rmdopen-2023-003750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 01/04/2024] [Indexed: 02/05/2024] Open
Abstract
OBJECTIVES The gut microbiota can mediate both pro and anti-inflammatory responses. In patients with psoriatic arthritis (PsA), we investigated the impact of faecal microbiota transplantation (FMT), relative to sham transplantation, on 92 inflammation-associated plasma proteins. METHODS This study relates to the FLORA trial cohort, where 31 patients with moderate-to-high peripheral PsA disease activity, despite at least 3 months of methotrexate treatment, were included in a 26-week, double-blind, randomised, sham-controlled trial. Participants were allocated to receive either one gastroscopic-guided healthy donor FMT (n=15) or sham (n=16). Patient plasma samples were collected at baseline, week 4, 12 and 26 while samples from 31 age-matched and sex-matched healthy controls (HC) were collected at baseline. Samples were analysed using proximity extension assay technology (Olink Target-96 Inflammation panel). RESULTS Levels of 26 proteins differed significantly between PsA and HC pre-FMT (adjusted p<0.05), of which 10 proteins were elevated in PsA: IL-6, CCL20, CCL19, CDCP1, FGF-21, HGF, interferon-γ (IFN-γ), IL-18R1, monocyte chemotactic protein 3, and IL-2. In the FMT group, levels of 12 proteins changed significantly across all timepoints (tumour necrosis factor (TNF), CDCP1, IFN-γ, TWEAK, signalling lymphocytic activation molecule (SLAMF1), CD8A, CD5, Flt3L, CCL25, FGF-23, CD6, caspase-8). Significant differences in protein levels between FMT and sham-treated patients were observed for TNF (p=0.002), IFN-γ (p=0.011), stem cell factor (p=0.024), matrix metalloproteinase-1 (p=0.038), and SLAMF1 (p=0.042). FMT had the largest positive effect on IFN-γ, Axin-1 and CCL25 and the largest negative effect on CCL19 and IL-6. CONCLUSIONS Patients with active PsA have a distinct immunological plasma protein signature compared with HC pre-FMT. FMT affects several of these disease markers, including sustained elevation of IFN-γ. TRIAL REGISTRATION NUMBER NCT03058900.
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Affiliation(s)
- Maja Skov Kragsnaes
- Department of Rheumatology, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | | | | | - Muhammad Irfan Malik
- Department of Mathematics and Computer Science (IMADA), University of Southern Denmark, Odense, Denmark
| | - Heidi Lausten Munk
- Department of Rheumatology, Odense University Hospital, Odense, Denmark
- Center for Rheumatology and Spine Diseases, Rigshospitalet, Copenhagen, Denmark
| | - Jens Kristian Pedersen
- Department of Rheumatology, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | | | | | - Karsten Kristiansen
- Department of Biology, Laboratory of Genomics and Molecular Biomedicine, University of Copenhagen, Copenhagen, Denmark
- Institute of Metagenomics, Qingdao-Europe Advanced Institute for Life Sciences, Qingdao, China
| | - Benjamin H Mullish
- Division of Digestive Diseases, Imperial College London Faculty of Medicine, London, UK
- Department of Gastroenterology and Hepatology, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Julian R Marchesi
- Division of Digestive Diseases, Imperial College London Faculty of Medicine, London, UK
| | - Jens Kjeldsen
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- Department of Medical Gastroenterology, Odense University Hospital, Odense, Denmark
| | - Richard Röttger
- Department of Mathematics and Computer Science (IMADA), University of Southern Denmark, Odense, Denmark
| | - Torkell Ellingsen
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
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Jeng LB, Wang J, Teng CF. Predictive Biomarkers of Immune Checkpoint Inhibitor-Based Mono- and Combination Therapies for Hepatocellular Carcinoma. J Cancer 2024; 15:484-493. [PMID: 38169551 PMCID: PMC10758026 DOI: 10.7150/jca.90128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 11/12/2023] [Indexed: 01/05/2024] Open
Abstract
Hepatocellular carcinoma (HCC) is among the most frequent and deadly human cancers worldwide. It has been shown that interaction between immune checkpoint receptors and ligands plays a crucial role in inhibition of T cell-mediated anti-tumor immune responses, thereby assisting tumor cells to evade the host immune surveillance. Therefore, several immune checkpoint inhibitors (ICIs) that selectively block immune checkpoint receptors or ligands have been developed as clinically effective and safe immunotherapeutic agents for treating HCC, including the inhibitors targeting cytotoxic T lymphocyte-associated antigen 4, programmed death 1, and programmed death ligand 1. In addition, various combinations of ICIs and other ICIs or tyrosine kinase inhibitors or vascular endothelial growth factor inhibitors have also emerged as clinically beneficial treatments for HCC. However, the overall response rates of ICI mono-therapy and combination therapy in HCC patients remain unsatisfied, highlighting the urgent need for discovering valuable predictive biomarkers to achieve personalized therapy. This review comprehensively summarizes the literature-based evidence validating a variety of biomarkers with predictive significance for treatment responses and outcomes in HCC patients receiving various ICI-based mono- and combination therapies.
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Affiliation(s)
- Long-Bin Jeng
- Organ Transplantation Center, China Medical University Hospital, Taichung, Taiwan
- Department of Surgery, China Medical University Hospital, Taichung, Taiwan
- Cell Therapy Center, China Medical University Hospital, Taichung, Taiwan
| | - John Wang
- Department of Pathology, China Medical University Hospital, Taichung, Taiwan
| | - Chiao-Fang Teng
- Organ Transplantation Center, China Medical University Hospital, Taichung, Taiwan
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
- Program for Cancer Biology and Drug Development, China Medical University, Taichung, Taiwan
- Research Center for Cancer Biology, China Medical University, Taichung, Taiwan
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Dalal N, Makharia GK, Dalal M, Mohan A, Singh R, Kumar A. Gut Metabolite Indoxyl Sulfate Has Selective Deleterious and Anticancer Effect on Colon Cancer Cells. J Med Chem 2023; 66:17074-17085. [PMID: 38103027 DOI: 10.1021/acs.jmedchem.3c01907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
There are a number of reports about anticancer activity of indole derivatives. In this study, we investigated the role of indoxyl sulfate (IS) for its selective anticancer activity on colon cancer cells. IS treatment on HCT-116 and HT-29 human epithelial adenocarcinoma cells led to a decrease in cell proliferation, cell viability, and ATP content. Colon cancer cells showed a 10% increase in cell apoptosis in comparison to control. Due to IS treatment, cell morphology got distorted, cell number found decreased, intracellular vesicles formed, and cells were found floating in the media. Cells also showed a loss in membrane integrity and a decrease in colony-forming ability and ceased at the G2/M phase of the cell cycle. No significant change was noted in the level of inflammatory cytokines IL-17A, IL-1β, and TNF-α, histology, length of intestine, and spleen after 100 mM IS treatment to balb/c mice. These observations indicate the selective anticancer effect of IS on colon cancer cells.
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Affiliation(s)
- Nishu Dalal
- Gene Regulation Laboratory, National Institute of Immunology, New Delhi 110067, India
- Department of Environmental Studies, Satyawati College, Delhi University, Delhi 110052, India
| | - Govind K Makharia
- Department of Gastroenterology and Human Nutrition, AIIMS, New Delhi 110029, India
| | - Monu Dalal
- ICMR - National Institute of Malaria Research, New Delhi 110077, India
| | - Anand Mohan
- School of Bioengineering and Biosciences, Lovely Professional University, Phagwara 144411, Punjab, India
| | - Rajeev Singh
- Department of Environmental Studies, Satyawati College, Delhi University, Delhi 110052, India
| | - Anil Kumar
- Gene Regulation Laboratory, National Institute of Immunology, New Delhi 110067, India
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Anzar I, Malone B, Samarakoon P, Vardaxis I, Simovski B, Fontenelle H, Meza-Zepeda LA, Stratford R, Keung EZ, Burgess M, Tawbi HA, Myklebost O, Clancy T. The interplay between neoantigens and immune cells in sarcomas treated with checkpoint inhibition. Front Immunol 2023; 14:1226445. [PMID: 37799721 PMCID: PMC10548483 DOI: 10.3389/fimmu.2023.1226445] [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: 05/21/2023] [Accepted: 07/10/2023] [Indexed: 10/07/2023] Open
Abstract
Introduction Sarcomas are comprised of diverse bone and connective tissue tumors with few effective therapeutic options for locally advanced unresectable and/or metastatic disease. Recent advances in immunotherapy, in particular immune checkpoint inhibition (ICI), have shown promising outcomes in several cancer indications. Unfortunately, ICI therapy has provided only modest clinical responses and seems moderately effective in a subset of the diverse subtypes. Methods To explore the immune parameters governing ICI therapy resistance or immune escape, we performed whole exome sequencing (WES) on tumors and their matched normal blood, in addition to RNA-seq from tumors of 31 sarcoma patients treated with pembrolizumab. We used advanced computational methods to investigate key immune properties, such as neoantigens and immune cell composition in the tumor microenvironment (TME). Results A multifactorial analysis suggested that expression of high quality neoantigens in the context of specific immune cells in the TME are key prognostic markers of progression-free survival (PFS). The presence of several types of immune cells, including T cells, B cells and macrophages, in the TME were associated with improved PFS. Importantly, we also found the presence of both CD8+ T cells and neoantigens together was associated with improved survival compared to the presence of CD8+ T cells or neoantigens alone. Interestingly, this trend was not identified with the combined presence of CD8+ T cells and TMB; suggesting that a combined CD8+ T cell and neoantigen effect on PFS was important. Discussion The outcome of this study may inform future trials that may lead to improved outcomes for sarcoma patients treated with ICI.
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Affiliation(s)
- Irantzu Anzar
- Oslo Cancer Cluster, NEC OncoImmunity AS, Oslo, Norway
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | | | | | | | | | | | - Leonardo A. Meza-Zepeda
- Institute for Cancer Research, Oslo University Hospital, Oslo, Norway
- Genomics Core Facility, Department of Core Facilities, Oslo University Hospital, Oslo, Norway
| | | | - Emily Z. Keung
- Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Melissa Burgess
- Department of Medical Oncology, University of Pittsburgh Medical Center, Pittsburgh, PA, United States
| | - Hussein A. Tawbi
- Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Ola Myklebost
- Institute for Cancer Research, Oslo University Hospital, Oslo, Norway
- Department of Clinical Science, University of Bergen, Bergen, Norway
| | - Trevor Clancy
- Oslo Cancer Cluster, NEC OncoImmunity AS, Oslo, Norway
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Miao S, Zhang Q. Circulating circRNA: a social butterfly in tumors. Front Oncol 2023; 13:1203696. [PMID: 37546422 PMCID: PMC10401440 DOI: 10.3389/fonc.2023.1203696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 06/20/2023] [Indexed: 08/08/2023] Open
Abstract
Circular RNAs (circRNAs) are a class of single-stranded non-coding RNAs that form circular structures through irregular splicing or post-splicing events. CircRNAs are abnormally expressed in many cancers and regulate the occurrence and development of tumors. Circulating circRNAs are cell-free circRNAs present in peripheral blood, they are considered promising biomarkers due to their high stability. In recent years, more and more studies have revealed that circulating circRNAs participate in various cellular communication and regulate the occurrence and development of tumors, which involve many pathological processes such as tumorigenesis, tumor-related immunity, tumor angiogenesis, and tumor metastasis. Understanding the role of cell communication mediated by circulating circRNAs in tumor will further reveal the value and significance behind their use as biomarkers and potential therapeutic targets. In this review, we summarize the recent findings and provide an overview of the cell-cell communication mediated by circulating circRNAs, aiming to explore the role and application value of circulating circRNAs in tumors.
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Affiliation(s)
- Shuo Miao
- Department of Urology, Affiliated Hospital of Qingdao University, Qingdao, China
- School of Basic Medicine, Qingdao University, Qingdao, China
| | - Qingsong Zhang
- Department of Urology, Affiliated Hospital of Qingdao University, Qingdao, China
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Hong SH. Influence of Microbiota on Vaccine Effectiveness: "Is the Microbiota the Key to Vaccine-induced Responses?". J Microbiol 2023:10.1007/s12275-023-00044-6. [PMID: 37052795 PMCID: PMC10098251 DOI: 10.1007/s12275-023-00044-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 03/17/2023] [Accepted: 03/17/2023] [Indexed: 04/14/2023]
Abstract
Vaccines are one of the most powerful tools for preventing infectious diseases. To effectively fight pathogens, vaccines should induce potent and long-lasting immune responses that are specific to the pathogens. However, not all vaccines can induce effective immune responses, and the responses vary greatly among individuals and populations. Although several factors, such as age, host genetics, nutritional status, and region, affect the effectiveness of vaccines, increasing data have suggested that the gut microbiota is critically associated with vaccine-induced immune responses. In this review, I discuss how gut microbiota affects vaccine effectiveness based on the clinical and preclinical data, and summarize possible underlying mechanisms related to the adjuvant effects of microbiota. A better understanding of the link between vaccine-induced immune responses and the gut microbiota using high-throughput technology and sophisticated system vaccinology approaches could provide crucial insights for designing effective personalized preventive and therapeutic vaccination strategies.
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Affiliation(s)
- So-Hee Hong
- Department of Microbiology, College of Medicine, Ewha Womans University, Seoul, 07084, Republic of Korea.
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Wang L, Tang L, Zhai D, Song M, Li W, Xu S, Jiang S, Meng H, Liang J, Wang Y, Zhang B. The role of the sex hormone-gut microbiome axis in tumor immunotherapy. Gut Microbes 2023; 15:2185035. [PMID: 36880651 PMCID: PMC10012946 DOI: 10.1080/19490976.2023.2185035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/08/2023] Open
Abstract
Accumulating evidence suggested that both gut microbiome and sex play a critical role in the efficacy of immune checkpoint blockade therapy. Considering the reciprocal relationship between sex hormones and gut microbiome, the sex hormone-gut microbiome axis may participate in the regulation of the response to immune checkpoint inhibitors (ICIs). In this review, it was attempted to summarize the current knowledge about the influences of both sex and gut microbiome on the antitumor efficacy of ICIs and describe the interaction between sex hormones and gut microbiome. Accordingly, this review discussed the potential of enhancing the antitumor efficacy of ICIs through regulating the levels of sex hormones through manipulation of gut microbiome. Collectively, this review provided reliable evidence concerning the role of the sex hormone-gut microbiome axis in tumor immunotherapy.
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Affiliation(s)
- Luoyang Wang
- Department of Immunology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Lei Tang
- Department of Special Medicine, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Dongchang Zhai
- Department of Special Medicine, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Meiying Song
- Department of Immunology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Wei Li
- Department of Immunology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Shuo Xu
- Department of Immunology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Suli Jiang
- Department of Immunology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Haining Meng
- School of Emergency Medicine, Qingdao University, Qingdao, China
| | - Jie Liang
- Department of Immunology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Yingying Wang
- Shandong Provincial Key Laboratory of Animal Cell and Developmental Biology, School of Life Sciences, Shandong University, Qingdao, China
| | - Bei Zhang
- Department of Immunology, School of Basic Medicine, Qingdao University, Qingdao, China
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The Urinary Microbiome; Axis Crosstalk and Short-Chain Fatty Acid. Diagnostics (Basel) 2022; 12:diagnostics12123119. [PMID: 36553126 PMCID: PMC9777402 DOI: 10.3390/diagnostics12123119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/14/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
Our knowledge that "urine is sterile" is no longer accepted after the development of a next-generation sequencing (NGS) test. Using NGS, microbiota in the human body were discovered, and it is expected that this will improve our understanding of human diseases. However, the mechanism involved in the effect of the microbiome on diseases is still poorly understood. Associations of gut microbiome with diseases have been recently reported. Based on such associations, bladder-gut-brain axis, gut-bladder axis, gut-vagina-bladder axis, and gut-kidney axis as novel mechanisms of action of the microbiome have been suggested. Each axis can influence the development and progression of disease through interactions. In these interactions, metabolites of the microbiome including short-chain fatty acids (SCFA) and the inflammasome play an important role. Inflammasomes are multiprotein oligomers that can initiate inflammatory responses. Inflammasomes can trigger inflammation and pyroptosis and ultimately contribute to disease development. SCFAs play an important role in immune cell migration, cytokine production, and maintenance of cellular homeostasis. Associations of inflammasomes with systemic diseases such as obesity and insulin resistance have been reported. The roles of inflammasomes and SCFAs in kidney, bladder, and prostate diseases have also been revealed recently.
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