No abstract available.
Dysbiosis ; Dyspepsia ; Helicobacter pylori ; Helicobacter

Whether we are aware or not, diverse microorganisms are living on almost all environmentally exposed surfaces on our body without eliciting harmful immune responses. In fact, recent understanding from numerous studies indicates that our health is highly dependent on the contribution of intestinal commensal bacteria. It appears through its symbiotic interaction with the host, which is the result of millions of years of co-evolution, the microbiota shapes the immune system. In this review, we discuss the relationship between host physiology and commensal bacteria and explore the molecular mechanisms by which the adaptive immune system is influenced by the intestinal microbiota.
Bacteria ; Dysbiosis ; Immune System* ; Microbiota* ; Physiology

The human oral microbiome harbors one of the most diverse microbial communities in the human body, playing critical roles in oral and systemic health. Recent technological innovations are propelling the characterization and manipulation of oral microbiota. High-throughput sequencing enables comprehensive taxonomic and functional profiling of oral microbiomes. New long-read platforms improve genome assembly from complex samples. Single-cell genomics provides insights into uncultured taxa. Advanced imaging modalities including fluorescence, mass spectrometry, and Raman spectroscopy have enabled the visualization of the spatial organization and interactions of oral microbes with increasing resolution. Fluorescence techniques link phylogenetic identity with localization. Mass spectrometry imaging reveals metabolic niches and activities while Raman spectroscopy generates rapid biomolecular fingerprints for classification. Culturomics facilitates the isolation and cultivation of novel fastidious oral taxa using high-throughput approaches. Ongoing integration of these technologies holds the promise of transforming our understanding of oral microbiome assembly, gene expression, metabolites, microenvironments, virulence mechanisms, and microbe-host interfaces in the context of health and disease. However, significant knowledge gaps persist regarding community origins, developmental trajectories, homeostasis versus dysbiosis triggers, functional biomarkers, and strategies to deliberately reshape the oral microbiome for therapeutic benefit. The convergence of sequencing, imaging, cultureomics, synthetic systems, and biomimetic models will provide unprecedented insights into the oral microbiome and offer opportunities to predict, prevent, diagnose, and treat associated oral diseases.
Humans ; Phylogeny ; Biomimetics ; Dysbiosis ; Homeostasis ; Mass Spectrometry

Gut microbiota play a critical role in the development of intestinal cancer. Dietary changes cause dysbiosis of gut microbiota that mediates production of dietary factors triggering intestinal cancer. Genetic and dietary factors work in different combinatorial ways in initiation and progression of intestinal cancer, one of which is changes in gut microbiota. Recently, it has been found that high-fat-diet promote intestinal tumorigenesis in a genetically susceptible K-ras(G12Dint) mice without induction of obesity. High-fat-diet along with oncogene activation dampened paneth-cell mediated immunity and thus shift bacterial communities in such a way that promotes intestinal cancer.
Animals ; Carcinogenesis* ; Dysbiosis ; Intestinal Neoplasms ; Mice ; Microbiota* ; Obesity ; Oncogenes

The huge communities of microorganisms that symbiotically colonize humans are recognized as significant players in health and disease. The human microbiome may influence prostate cancer development. To date, several studies have focused on the effect of prostate infections as well as the composition of the human microbiome in relation to prostate cancer risk. Current studies suggest that the microbiota of men with prostate cancer significantly differs from that of healthy men, demonstrating that certain bacteria could be associated with cancer development as well as altered responses to treatment. In healthy individuals, the microbiome plays a crucial role in the maintenance of homeostasis of body metabolism. Dysbiosis may contribute to the emergence of health problems, including malignancy through affecting systemic immune responses and creating systemic inflammation, and changing serum hormone levels. In this review, we discuss recent data about how the microbes colonizing different parts of the human body including urinary tract, gastrointestinal tract, oral cavity, and skin might affect the risk of developing prostate cancer. Furthermore, we discuss strategies to target the microbiome for risk assessment, prevention, and treatment of prostate cancer.
Bacteria ; Dysbiosis ; Humans ; Male ; Microbiota ; Prostatic Neoplasms/prevention & control*

Stress is the non-specific systemic response that occurs when the body is stimulated by various factors, and it can affect multiple systems of the body. Recent studies have shown that gut microbiota is an essential part of human microecology, and plays a pivotal role in keeping the body healthy. Stress can result in gut dysbiosis by affecting the function of intestinal mucosal barrier, intestinal immune and gastrointestinal motility. This article reviewed the alteration of gut microbiota caused by stress and the possible mechanisms involved.
Dysbiosis ; Gastrointestinal Microbiome ; Gastrointestinal Motility ; Humans ; Intestinal Mucosa

A massive depletion of CD4+ T lymphocytes has been described in early and acute human immunodeficiency virus (HIV) infection, leading to an imbalance between the human microbiome and immune responses. In recent years, a growing interest in the alterations in gut microbiota in HIV infection has led to many studies; however, only few studies have been conducted to explore the importance of oral microbiome in HIV-infected individuals. Evidence has indicated the dysbiosis of oral microbiota in people living with HIV (PLWH). Potential mechanisms might be related to the immunodeficiency in the oral cavity of HIV-infected individuals, including changes in secretory components such as reduced levels of enzymes and proteins in saliva and altered cellular components involved in the reduction and dysfunction of innate and adaptive immune cells. As a result, disrupted oral immunity in HIV-infected individuals leads to an imbalance between the oral microbiome and local immune responses, which may contribute to the development of HIV-related diseases and HIV-associated non-acquired immunodeficiency syndrome comorbidities. Although the introduction of antiretroviral therapy (ART) has led to a significant decrease in occurrence of the opportunistic oral infections in HIV-infected individuals, the dysbiosis in oral microbiome persists. Furthermore, several studies with the aim to investigate the ability of probiotics to regulate the dysbiosis of oral microbiota in HIV-infected individuals are ongoing. However, the effects of ART and probiotics on oral microbiome in HIV-infected individuals remain unclear. In this article, we review the composition of the oral microbiome in healthy and HIV-infected individuals and the possible effect of oral microbiome on HIV-associated oral diseases. We also discuss how ART and probiotics influence the oral microbiome in HIV infection. We believe that a deeper understanding of composition and function of the oral microbiome is critical for the development of effective preventive and therapeutic strategies for HIV infection.
Dysbiosis ; Gastrointestinal Microbiome ; HIV Infections/drug therapy* ; Humans ; Microbiota ; Mouth

Lung microbiota and gut microbiota are closely related to lung cancer. Studies have shown that the dysbiosis, i.e., the significantly altered composition and structure of gut and lung microbiota, usually occurs in patients with lung cancer. With the introduction of "Gut-Lung Axis", an increasing attention has been paid to the close relationship between the lung and gut microbiota in human body. A deeper insight into this relationship would facilitate understanding the mechanisms behind the carcinogenesis and development of lung cancer. This article summarizes the composition of lung and gut microbiota in patients with lung cancer and the possible interaction mechanisms, highlighting the importance of the immune system in the Gut-Lung Axis. The effects of lung and gut microbiota on the clinical treatment of lung cancer were summarized, based on which the authors propose that the lung and gut microbiota can be used as novel targets for early diagnosis and treatment of lung cancer.
Carcinogenesis ; Dysbiosis ; Gastrointestinal Microbiome ; Humans ; Lung ; Lung Neoplasms

Bacterial vaginosis (BV) is a disease caused by vaginal microbiota dysbiosis. The conventional antibiotic treatment can aggravate microbial dysbiosis, alter the acid environment of the vagina and lead to drug resistance, thus shows low cure rate and high recurrence rate. This poses significant physiological and psychological burden to the BV patients. Vaginal microbiota transplantation (VMT) is a novel live biotherapeutic approach. It directly engrafts the whole vaginal microbiota from healthy women to the vaginal tract of patients to rapidly reconstruct the vaginal microbiota environment and restore the vaginal health. This article summarizes the development, present challenges, and future directions of using VMT, with the aim to explore new strategies for treatment of BV and promote the clinical use of VMT.
Dysbiosis/therapy* ; Female ; Humans ; Microbiota ; Vagina ; Vaginosis, Bacterial/therapy*

Unique factors in the space environment can cause dysbiosis of astronauts' gut microbiota and its metabolites, which may exert systematic physiological effects on human body. Recent progress regarding the effect of space flight/simulated space environment (SF/SPE) on the composition of gut microbiota and its metabolites was reviewed in this paper. SF/SPE may cause the increase of invasive pathogenic bacteria and the decrease of beneficial bacteria, aggravating intestinal inflammation and increasing intestinal permeability. SF/SPE may also cause the decrease of beneficial metabolites or the increase of harmful metabolites of gut microbiota, leading to metabolism disorder in vivo, or inducing damage of other systems, thus not beneficial to the health and working efficiency of astronauts. Summarizing the effects of SF/SPE on gut microbiota may provide scientific basis for further researches in this field and the on-orbit health protection of astronauts.
Humans ; Gastrointestinal Microbiome/physiology* ; Dysbiosis/microbiology* ; Bacteria/metabolism*