Cyclin Dependent Kinase 1 (CDK1) Activates Cardiac Fibroblasts via Directly Phosphorylating Paxillin at Ser244.

Abstract:

:Atrial fibrillation has caused severe burden for people worldwide. Differentiation of fibroblasts into myofibroblasts, and consequent progress in atrial structural remodeling have been considered the basis for persistent atrial fibrillation, yet little is known about the molecular mechanisms underlying the process. Here, we show that cyclin-dependent kinase 1 (CDK1) is activated in atrial fibroblasts from patients with atrial fibrillation (AFPAF) and in platelet derived growth factor BB (PDGF-BB)-treated atrial fibroblasts from patients with sinus rhythm (AFPSR). We also demonstrate that inhibition of CDK1 suppresses fibroblast differentiation and focal adhesion (FA) complex formation. The FA protein paxillin is phosphorylated directly at Ser244 by CDK1. Importantly, transfection of a paxillin construct harboring a Ser to Ala mutation causes FA complex disassembly and greatly inhibits fibroblast activation. AFPSRs applied with a lentiviral vector carrying the shRNA sequence of paxillin dramatically prevents PDGF-BB induced functional activation. Taken together, all these results suggest that phosphorylation of paxillin at Ser244 by CDK1 is a key mechanism in fibroblast differentiation and could eventually assist atrial fibrosis.

journal_name

Int Heart J

authors

Sai C,Yunhan J,Zhao J,Yu Z,Yun Z,Zhezhe C,Fuqin T,Yingbin X,Ruiyan M

doi

10.1536/ihj.18-073

subject

Has Abstract

pub_date

2019-03-20 00:00:00

pages

374-383

issue

2

eissn

1349-2365

issn

1349-3299

journal_volume

60

pub_type

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