Background: Alterations in gut microbiota, coupled to increased gut permeability are now widely recognized as having a role in the etiology, course and treatment of many medical conditions, including autoimmune and neurodegenerative disorders.
Methods: In this review, the role that such gut changes play over the course of multiple sclerosis (MS) is detailed.
Results: Given the wide array of biological factors and processes that have been shown to be altered in MS, including changes in the gut, this allows for a better integration of the diverse array of pathophysiological processes linked to MS. Such pathophysiological processes include increases in oxidative and nitrosative stress, pro-inflammatory immune responses, especially T helper (Th)17 cell proliferation and activation, tryptophan catabolites, pain, fatigue and increased levels of depression. By raising levels of immune activation, increased gut permeability and alterations in gut microbiota impact on all of these MS-associated processes. Alterations in the regulation of local melatonergic pathway activation is proposed to be an important hub for such pathophysiological processes in MS, allowing for the increased frequency of depression that may be prodromal in MS, both in the first episode as well as in relapses, to become more intimately associated with the etiology and course of MS. We propose this occurs by decreasing serotonin availability as a precursor for the melatoninergic pathways.
Conclusion: Changes in the gut are evident in the early stages of MS, including in paediatric MS, and may interact with pro-inflammatory genetic susceptibility genes to drive the biological underpinnings of MS. Such a conceptualization of the biological underpinnings of MS also has treatment implications.
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http://dx.doi.org/10.2174/1381612822666160915160520 | DOI Listing |
Anim Microbiome
January 2025
Department of Biochemistry, The University of Western Ontario, 1151 Richmond St., London, ON, N6A 5C1, Canada.
Symbiotic microbiota are important drivers of host behaviour, health, and fitness. While most studies focus on humans, model organisms, and domestic or economically important species, research investigating the role of host microbiota in wild populations is rapidly accumulating. Most studies focus on the gut microbiota; however, skin and other glandular microbiota also play an important role in shaping traits that may impact host fitness.
View Article and Find Full Text PDFMol Neurodegener
January 2025
Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD, 20815, USA.
Gastrointestinal (GI) involvement in Lewy body diseases (LBDs) has been observed since the initial descriptions of patients by James Parkinson. Recent experimental and human observational studies raise the possibility that pathogenic alpha-synuclein (⍺-syn) might develop in the GI tract and subsequently spread to susceptible brain regions. The cellular and mechanistic origins of ⍺-syn propagation in disease are under intense investigation.
View Article and Find Full Text PDFGut Pathog
January 2025
Division of Gastroenterology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Avenue, Wuhan, 430030, China.
Background: Helicobacter pylori (H. pylori) eradication regimens may have different effects on the gut microbiota. Few studies have analyzed the safety of high-dose dual therapy (HDDT) from a micro-ecological perspective.
View Article and Find Full Text PDFBMC Vet Res
January 2025
College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, 450046, Henan, China.
Background: Coccidia are among the primary pathogens causing diarrhea and even fatalities in lambs. With the increasing use of chemical drugs to treat coccidiosis, the problem of drug resistance is becoming more and more threatening. Therefore, there is an urgent need to identify novel alternative drugs for the treatment of the lamb coccidia.
View Article and Find Full Text PDFBMC Infect Dis
January 2025
Botany and Microbiology Department, Faculty of Science, Menoufia University, Shebeen El-Kom, Egypt.
Background: Liver transplantation (LT) is a critical intervention for individuals with end-stage liver disease; yet, post-transplant problems, especially infections, graft rejection, and chronic liver disease, are often linked to systemic inflammation. Cytokines, small signaling molecules, significantly influence immune responses during and post-liver transplantation. Nonetheless, the intricate relationships among cytokines, immune responses, and the gut microbiota, especially gut dysbiosis, are still inadequately comprehended.
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