Myeloid MKL1 Disseminates Cues to Promote Cardiac Hypertrophy in Mice

Copyright © 2021 Liu, Zhao, Lin, Yang, Yu, Zhuo, Yang and Xu..

Cardiac hypertrophy is a key pathophysiological process in the heart in response to stress cues. Although taking place in cardiomyocytes, the hypertrophic response is influenced by other cell types, both within the heart and derived from circulation. In the present study we investigated the myeloid-specific role of megakaryocytic leukemia 1 (MKL1) in cardiac hypertrophy. Following transverse aortic constriction (TAC), myeloid MKL1 conditional knockout (MFCKO) mice exhibit an attenuated phenotype of cardiac hypertrophy compared to the WT mice. In accordance, the MFCKO mice were protected from excessive cardiac inflammation and fibrosis as opposed to the WT mice. Conditioned media collected from macrophages enhanced the pro-hypertrophic response in cardiomyocytes exposed to endothelin in an MKL1-dependent manner. Of interest, expression levels of macrophage derived miR-155, known to promote cardiac hypertrophy, were down-regulated in the MFCKO mice compared to the WT mice. MKL1 depletion or inhibition repressed miR-155 expression in macrophages. Mechanistically, MKL1 interacted with NF-κB to activate miR-155 transcription in macrophages. In conclusion, our data suggest that MKL1 may contribute to pathological hypertrophy via regulating macrophage-derived miR-155 transcription.

Medienart:

E-Artikel

Erscheinungsjahr:

2021

Erschienen:

2021

Enthalten in:

Zur Gesamtaufnahme - volume:9

Enthalten in:

Frontiers in cell and developmental biology - 9(2021) vom: 20., Seite 583492

Sprache:

Englisch

Beteiligte Personen:

Liu, Li [VerfasserIn]
Zhao, Qianwen [VerfasserIn]
Lin, Lin [VerfasserIn]
Yang, Guang [VerfasserIn]
Yu, Liming [VerfasserIn]
Zhuo, Lili [VerfasserIn]
Yang, Yuyu [VerfasserIn]
Xu, Yong [VerfasserIn]

Links:

Volltext

Themen:

Cardiac hypertrophy
Journal Article
Macrophage
MiRNA
NF-κB
Transcriptional regulation

Anmerkungen:

Date Revised 28.04.2021

published: Electronic-eCollection

Citation Status PubMed-not-MEDLINE

doi:

10.3389/fcell.2021.583492

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM324519591