Active clinical trials for "Dysbiosis"

This study evaluates the interaction between host immune cells and bacteria associated with periodontitis. It comprises biological material from donors with and without periodontal disease. Specifically, we collect a spit and blood sample to conduct in vitro stimulations and measurements of selected parameters related to periodontitis to clarify obscure areas in the immunologic pathogenesis of this disease.

Periodontitis is a chronic inflammatory disease of the tooth supporting structures induced by a dysbiosis in the oral and subgingival microenvironment of susceptible patients. The long-term swallowing of high doses of periodontal pathogenic microorganisms could induce a dysbiosis of the intestinal microbiota, favouring the establishment of an 'inflamed' microbiome in terms of composition and/or function. The present project is aimed at a better understanding of the etiopathogenetic correlation between periodontitis and intestinal dysbiosis, and aims to explore the hypothesis that non-surgical periodontal treatment may reduce bacterial alpha diversity in stool samples. Fifty patients affected by stage III-IV periodontitis will be recruited, and treated by means of full-mouth scaling and root planing. Salivary and stool samples, together with a complete periodontal charting and a food diary will be collected and compared at baseline and 3 months after treatment. Age, gender and BMI-matched healthy individuals will be recruited as controls.

The microbiota interacts with several human organs and influences the physiological process in the host. The predominant Phyla of species in the gut microbiota are Bacteroidetes (B) and Firmicutes (F), accounting for 60-80%, and Proteobacteria (P) and Actinobacteria (A) in minority. When some of the bacterial Phyla species are unbalanced, the pathological state of dysbiosis occurs. A laboratory index used for clinical analyzes is the F / B ratio <0.8, which characterizes an intestinal dysbiotic state. Many causes can affect the intestinal microbiota, thus altering it in a dysbiotic state, first of all the diet. In fact, dysbiosis can be characterized both by the severity with which it manifests itself and is also distinguished in putrefactive and fermentative dysbiosis. Furthermore, the variation in the "normal" percentages of the Phyla is also related to some pathological alterations. The aim of this study will be to monitor the population and heterogeneity of the microbiota in the Italian population. Knowing the complex implications of dysbiosis and the extensive data on it, this study will want to detail the state of the gut microbiota in the previously indicated population, focusing attention on peculiar profiles that could reflect a pathogenic spectrum or metabolic disturbances. The study aims to investigate the diffusion and state of the microbiota in the Italian territory and if it occurs in association with certain pathologies and / or diet.

This study plans to learn more about immune responses in intestinal (gut) tissue in people with human immunodeficiency virus (HIV) infection. This study will determine whether change in the composition of gut bacteria in HIV infected individuals is related to a high prevalence of chronic gut inflammation and metabolic disease. The investigators will also investigate immune-modulatory properties of specific bacteria that correlate with disease both by characterizing which functional genes are selected for in their genomes and by stimulating immune cells isolated from blood and gut tissue with bacterial isolates. This work will establish whether gain/loss of bacterial drivers/suppressors of information in the gut contributes to metabolic disease in HIV-infected individuals.

The gut microbiota is a complex community comprising around 10^14 bacteria that live in the gut lumen. The imbalance of the normal structure and function of the microbiota, defined as dysbiosis, has been related to a wide diversity of pathologies, including mental health disorders. However, clinical evidence of the relationship between microbiota and mood disorders is lacking. The aim of this project is to examine the possible relationship of gut dysbiosis and the diagnosis of bipolar disorder (BD), of gut dysbiosis and mood relapses and of gut dysbiosis and cognitive impairment in bipolar patients.

Pulmonary arterial hypertension (PAH) is fatal with right heart failure due to raised pulmonary vascular pressure. Gut dysbiosis was identified in animals with pulmonary hypertension. Deidentified human samples will be tested for gut dysbiosis in PAH, circulating bacterial metabolites and markers of inflammation and gut leakiness. The gut microbiome and circulating metabolites, markers of inflammation and gut leakiness of PAH patients and healthy subjects will be compared in deidentified fecal samples and blood.

Prevalence Study evaluating the acquisition of carriage of multidrug-resistant Gram-negative bacteria (MDRGNB) in the gut flora in volunteers of French Armed Forces staying from 4 to 6 months outside France.

Depending on recent studies in literature the investigators aimed to compare whether gastrointestinal tolerance differs between infants fed with palm olein containing or palm olein free formulas. Besides it is showed that palm olein containing formulas decreases the absorption of fat and calcium by forming insoluble calcium soaps. So it is suggested that intestinal flora might be affected as a reason of these specialties. This study also aimed to investigate with culture-independent methods whether feeding infants with palm olein free formula results in the modification of their intestinal microbiota in such a way that is similar to breastfed ones.

This is an observational case-control study which objective is to analyse differences in intestinal microbiota between patients with and without arterial stiffness, measured by pulse wave velocity. It will take place in two different research units located in Portugal and Spain.

Preliminary (proof of concept), monocentric, interventional, prospective, non-randomized and analytic trial designed to simultaneously explore intestinal microbiota changes and early post-transplant immune reconstitution, and to correlate biological data with clinical data (antibiotics use, stress level, GVHD).