VEGFR1 Signaling Regulates IL-4-Mediated Arginase 1 Expression in Macrophages.

Abstract:

BACKGROUND:Macrophages undergo polarization or activation in response to environmental stimuli, an essential process for proper immune response. Meanwhile, excessive activation of macrophages causes autoimmune diseases. It is therefore crucial to prevent over-activation of macrophage in order to maintain the proper immune response. Arginase 1 (Arg-1) plays a critical role in coordinating the immune response by regulating availability of arginine. OBJECTIVE:To understand the mechanism of Arg-1 regulation. METHODS:Real-time PCR and Western Blot analysis were utilized to examine the Arg-1 levels expressed from the VEGFR1-deleted and VEGFR1-TK-deficient bone marrowderived macrophages (BMDMs). RESULTS:The VEGFR1-mediated signaling suppressed IL-4-induced Arg-1 expression. Deletion of VEGFR1 resulted in elevated Arg-1 expression and the tyrosine kinase domain of VEGFR1 was required for the suppression. Each of three ligands of VEGFR1, VEGF-A, VEGF-B and PIGF, mediated the inhibition to the similar degree. CONCLUSION:Our findings identified a novel function of the VEGFR1 signaling in avoiding over-expression of Arginase 1 potentially to maintain the proper innate immune response.

journal_name

Curr Mol Med

authors

Zou Y,Chen Q,Ye Z,Li X,Ju R

doi

10.2174/1566524017666171106114537

subject

Has Abstract

pub_date

2017-12-07 00:00:00

pages

304-311

issue

4

eissn

1566-5240

issn

1875-5666

pii

CMM-EPUB-86690

journal_volume

17

pub_type

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