Peptidoglycan-induced modulation of metabolic and inflammatory responses

Peptidoglycan-induced modulation of metabolic and inflammatory responses

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DOI 10.1097/IN9.0000000000000024
刊名
IJ
年,卷(期) 2023, 5(2)
作者
作者单位

[Wolf, Andrea J.] Cedars Sinai Med Ctr, F Widjaja Fdn Inflammatory Bowel Dis Inst, Karsh Div Gastroenterol & Hepatol, Los Angeles, CA 90048 USA;
[Wolf, Andrea J.] Cedars Sinai Med Ctr, Dept Biomed Sci, Res Div Immunol, Los Angeles, CA 90048 USA

摘要
Bacterial cell wall peptidoglycan is composed of innate immune ligands and, due to its important structural role, also regulates access to many other innate immune ligands contained within the bacteria. There is a growing body of literature demonstrating how innate immune recognition impacts the metabolic functions of immune cells and how metabolic changes are not only important to inflammatory responses but are often essential. Peptidoglycan is primarily sensed in the context of the whole bacteria during lysosomal degradation; consequently, the innate immune receptors for peptidoglycan are primarily intracellular cytosolic innate immune sensors. However, during bacterial growth, peptidoglycan fragments are shed and can be found in the bloodstream of humans and mice, not only during infection but also derived from the abundant bacterial component of the gut microbiota. These peptidoglycan fragments influence cells throughout the body and are important for regulating inflammation and whole-body metabolic function. Therefore, it is important to understand how peptidoglycan-induced signals in innate immune cells and cells throughout the body interact to regulate how the body responds to both pathogenic and nonpathogenic bacteria. This mini-review will highlight key research regarding how cellular metabolism shifts in response to peptidoglycan and how systemic peptidoglycan sensing impacts whole-body metabolic function.
Abstract
Bacterial cell wall peptidoglycan is composed of innate immune ligands and, due to its important structural role, also regulates access to many other innate immune ligands contained within the bacteria. There is a growing body of literature demonstrating how innate immune recognition impacts the metabolic functions of immune cells and how metabolic changes are not only important to inflammatory responses but are often essential. Peptidoglycan is primarily sensed in the context of the whole bacteria during lysosomal degradation; consequently, the innate immune receptors for peptidoglycan are primarily intracellular cytosolic innate immune sensors. However, during bacterial growth, peptidoglycan fragments are shed and can be found in the bloodstream of humans and mice, not only during infection but also derived from the abundant bacterial component of the gut microbiota. These peptidoglycan fragments influence cells throughout the body and are important for regulating inflammation and whole-body metabolic function. Therefore, it is important to understand how peptidoglycan-induced signals in innate immune cells and cells throughout the body interact to regulate how the body responds to both pathogenic and nonpathogenic bacteria. This mini-review will highlight key research regarding how cellular metabolism shifts in response to peptidoglycan and how systemic peptidoglycan sensing impacts whole-body metabolic function.
关键词
peptidoglycan; MDP; NOD1; NOD2; metabolism; inflammation
KeyWord
peptidoglycan; MDP; NOD1; NOD2; metabolism; inflammation
基金项目
页码 1-8
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Wolf, Andrea J.. Peptidoglycan-induced modulation of metabolic and inflammatory responses [J]. Immunometabolism. 2023; 5; (2). 1 - 8.

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