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Updated: Jan 8, 2026
A High Output Method to Isolate Cerebral Pericytes from Mouse
Published on: January 14, 2020
β2 microglobulin promotes pericyte proliferation through toll-like receptor 4
Yoshino Yonezu1, Akiko Uyeda2, Hidemi Misawa3
1Department of Molecular Pharmacology, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, 187-8502, Japan; Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Keio University, Tokyo, 105-8512, Japan.
Abstract:
Pericytes are perivascular cells that contribute to maintaining vascular integrity and central nervous system homeostasis. β2-microglobulin (B2M) is a component of the major histocompatibility complex class I molecule; it has recently been implicated in age-related and injury-associated inflammation. Here, we investigated the phenotypic and transcriptomic effects of B2M on mouse brain pericytes in vitro. B2M treatment increased Bromodeoxyuridine (BrdU) incorporation into the cultured pericytes as well as the number of Ki67-positive pericytes. Morphologically, B2M promoted pericyte extension. Toll-like receptor 4 (TLR4), one of the key molecules that regulates B2M function, was involved in the B2M-dependent pericyte proliferation. These findings were consistent with RNA-seq results showing differential expression of genes related to cell proliferation. These results suggest that B2M directly acts on pericytes and regulates part of their functional responses through TLR4 signaling.
Insights
Beta-2 microglobulin (B2M) promotes mouse brain pericyte proliferation and extension in vitro. This effect is mediated through Toll-like receptor 4 (TLR4) signaling, impacting cell growth and gene expression.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Pericytes are crucial for vascular integrity and central nervous system homeostasis.
- Beta-2 microglobulin (B2M) is linked to inflammation in aging and injury.
- Understanding B2M's role in brain pericytes is vital for neuroinflammation research.
Purpose of the Study:
- To investigate the effects of B2M on mouse brain pericytes.
- To elucidate the molecular mechanisms underlying B2M's impact on pericytes.
Main Methods:
- In vitro culture of mouse brain pericytes.
- Treatment with B2M.
- Assessment of proliferation using Bromodeoxyuridine (BrdU) and Ki67 staining.
- Morphological analysis.
- RNA sequencing (RNA-seq) for transcriptomic profiling.
- Involvement of Toll-like receptor 4 (TLR4) was investigated.
Main Results:
- B2M treatment increased pericyte proliferation (BrdU and Ki67 incorporation).
- B2M induced morphological changes, promoting pericyte extension.
- RNA-seq revealed differential gene expression related to cell proliferation.
- TLR4 signaling was identified as a key mediator of B2M's effects on pericytes.
Conclusions:
- B2M directly influences mouse brain pericytes.
- B2M promotes pericyte proliferation and extension via TLR4 signaling.
- These findings highlight B2M as a potential regulator of pericyte function in the CNS.
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