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The Role of Pericytes in Regulation of Innate and Adaptive Immunity

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BIOMEDICINES
卷 11, 期 2, 页码 -

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MDPI
DOI: 10.3390/biomedicines11020600

关键词

pericyte; immune system; immunosuppression; leukocyte trafficking

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Pericytes, which wrap microvascular capillaries, not only have structural function and participate in tissue regeneration, but also exhibit immune properties. They respond to pro-inflammatory stimuli and engage in innate immune responses through pattern-recognition receptors. Pericytes also regulate immune cell trafficking across vessel walls by expressing various adhesion molecules. Furthermore, pericytes play a role in modulating adaptive immunity. Interaction between pericytes and cancer cells leads to immunosuppression, facilitating immune evasion, cancer proliferation, and metastasis. However, this complex cross-talk offers potential therapeutic methods for cancer immunotherapy and treatment of autoimmune and auto-inflammatory disorders.
Pericytes are perivascular multipotent cells wrapping microvascular capillaries, where they support vasculature functioning, participate in tissue regeneration, and regulate blood flow. However, recent evidence suggests that in addition to traditionally credited structural function, pericytes also manifest immune properties. In this review, we summarise recent data regarding pericytes' response to different pro-inflammatory stimuli and their involvement in innate immune responses through expression of pattern-recognition receptors. Moreover, pericytes express various adhesion molecules, thus regulating trafficking of immune cells across vessel walls. Additionally, the role of pericytes in modulation of adaptive immunity is discussed. Finally, recent reports have suggested that the interaction with cancer cells evokes immunosuppression function in pericytes, thus facilitating immune evasion and facilitating cancer proliferation and metastasis. However, such complex and multi-faceted cross-talks of pericytes with immune cells also suggest a number of potential pericyte-based therapeutic methods and techniques for cancer immunotherapy and treatment of autoimmune and auto-inflammatory disorders.

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