Gut brain axis, the gut side - the biological role of microbial metabolites

6 important questions on Gut brain axis, the gut side - the biological role of microbial metabolites

What is the difference between MAMPs and PAMPs in innate immune recognition

MAMPS (microbe-associated molecular patterns) are molecules found on all microbes, including commensal and pathogens. PAMPs (pathogen-associated molecular patterns) are found on pathogenic microbes that trigger immune responses

How do short-chain fatty acids (SCFAs) affect tight junction protein expression in the intestinal barrier models?

SCFAs in intestinal barrier models increased occludin and claudin-1
Butyrate regultes the expression of tight junction proteins mediated by the activation of AMP-activated protein kinase (AMPK)

What is the link between mucus (mucin) production and luminal oxygen levels in the gut?

Butyrate production by gut microbiota increases oxygen consumption by colonocytes, thereby reducing luminal oxygenand maintaining an anaerobic environment
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What is the difference between primary and secondary bile acids, and which receptors do they activate?

Primary bile acids are made by the liver from cholesterol. They activate FXR

Secondary bile acids  are made by gut bacteria in colon, formed by modifying primary bile acids. They strongly activate TGR5

What is the function of AHR (aryl hydrocarbon receptors) in the gut and which metabolite activates AHR?

The function of aryl hydrocarbon receptors are providing a strong gut barrier and regulating immune responses and AHRs are activated by tryptophan-derived indoles from gut bacteria

What are 4 different TRP circulating metabolites?

4 different TRP circulating metabolites are
-tryptophol
-indole propionic acid
-indole acetic acid/tryptamien
-indoxyl sulfate: harmful!!

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