Circ_0079480 facilitates proliferation, migration and fibrosis of atrial fibroblasts in atrial fibrillation by sponing miR-338-3p to activate the THBS1/TGF-ß1/Smad3 signaling.
Int J Cardiol
; 416: 132486, 2024 Dec 01.
Article
en En
| MEDLINE
| ID: mdl-39187069
ABSTRACT
BACKGROUND:
Atrial fibrosis is associated with the pathogenesis of atrial fibrillation (AF). This study aims to discuss the function of circ_0079480 in atrial fibrosis and its underlying mechanism.METHODS:
In vitro and in vivo models of atrial fibrosis were established by using angiotensin II (Ang II) to treat human atrial fibroblasts (HAFs) and C57/B6J mice. qRT-PCR and western blot were used to examine the mRNA and protein expression levels. CCK-8, EdU, cell strach, and transwell assays were performed to determine the proliferation and migration of HAFs. Dual-luciferase reporter and RIP/RNA pull-down assays were explored to identify the interaction of miR-338-3p and circ_0079480/THBS1. HE and Masson's trichrome staining experiments were performed to analyze the histopathological change in mice atrial tissues.RESULTS:
Circ_0079480 expression was increased in AF patients' atrial tissues and Ang II-treated HAFs. Silencing circ_0079480 inhibited cell proliferation and migration and reduced fibrosis-associated gene expression in Ang II-treated HAFs. Circ_0079480 could target miR-338-3p to repress its expression. MiR-338-3p inhibitor blocked the inhibitory effects of circ_0079480 knockdown on HAFs proliferation, migration, and fibrosis. Thrombospondin-1 (THBS1) was confirmed as a downstream target of miR-338-3p, and circ_0079480 could sponge miR-338-3p to upregulate THBS1 expression. Moreover, silencing THBS1 suppressed Ang II-induced proliferation, migration, and fibrosis in HAFs. More importantly, depletion of circ_0079480 inactivated the THBS1/TGF-ß1/Smad3 signaling by upregulating miR-338-3p. Mice experiments also confirmed the suppression of circ_0079480 knockdown on atrial fibrosis.CONCLUSION:
Circ_0079480 acts as a sponge of miR-338-3p to upregulate THBS1 expression and activate the TGF-ß1/Smad3 signaling, finally promoting Ang II-induced atrial fibrosis.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fibrilación Atrial
/
Fibrosis
/
Transducción de Señal
/
Movimiento Celular
/
Trombospondina 1
/
MicroARNs
/
Proliferación Celular
/
Proteína smad3
/
Factor de Crecimiento Transformador beta1
/
Fibroblastos
Límite:
Animals
/
Humans
/
Male
Idioma:
En
Revista:
Int J Cardiol
Año:
2024
Tipo del documento:
Article
Pais de publicación:
Países Bajos