LPA3-mediated lysophosphatidic acid signaling promotes postnatal heart regeneration in mice.

Abstract:

:Background: Lysophosphatidic acid (LPA) is a small glycerophospholipid that acts as a potent extracellular signal in various biological processes and diseases. Our previous work demonstrated that the expression of the LPA receptors LPA1 and LPA3 is elevated in the early postnatal heart. However, the role of this stage-specific expression of LPA1 and LPA3 in the heart is unknown. Methods and Results: By using LPA3 and LPA1 knockout mice, and neonatal SD rats treated with Ki16425 (LPA1/LPA3 inhibitor), we found that the number of proliferating cardiomyocytes, detected by coimmunostaining pH3, Ki67 or BrdU with cardiac troponin T, was significantly decreased in the LPA3 knockout mice and the Ki16425-treated rats but not in the LPA1 knockout mice during the first week of postnatal life. Using a myocardial infarction (MI) model, we found that cardiac function and the number of proliferating cardiomyocytes were decreased in the neonatal LPA3 KO mice and increased in the AAV9-mediated cardiac-specific LPA3 overexpression mice. By using lineage tracing and AAV9-LPA3, we further found that LPA3 overexpression in adult mice enhances cardiac function and heart regeneration as assessed by pH3-, Ki67-, and Aurora B-positive cardiomyocytes and clonal cardiomyocytes after MI. Genome-wide transcriptional profiling and additional mechanistic studies showed that LPA induces cardiomyocyte proliferation through the PI3K/AKT, BMP-Smad1/5, Hippo/YAP and MAPK/ERK pathways in vitro, whereas only ERK was confirmed to be activated by LPA-LPA3 signaling in vivo. Conclusion: Our study reports that LPA3-mediated LPA signaling is a crucial factor for cardiomyocyte proliferation in the early postnatal heart. Cardiac-specific LPA3 overexpression improved cardiac function and promoted cardiac regeneration after myocardial injury induced by MI. This finding suggested that activation of LPA3 potentially through AAV-mediated gene therapy might be a therapeutic strategy to improve the outcome after MI.

journal_name

Theranostics

journal_title

Theranostics

authors

Wang F,Liu S,Pei J,Cai L,Liu N,Liang T,Dong X,Cong X,Chun J,Chen J,Hu S,Chen X

doi

10.7150/thno.47913

subject

Has Abstract

pub_date

2020-08-29 00:00:00

pages

10892-10907

issue

24

issn

1838-7640

pii

thnov10p10892

journal_volume

10

pub_type

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