Mitochondrial involvement in carbachol-induced intracellular Ca2+ mobilization and contraction in rat gastric smooth muscle

Mitochondrial involvement in carbachol-induced intracellular Ca2+ mobilization and contraction in rat gastric smooth muscle

Author Corrêa, Roberta Moreira Autor UNIFESP Google Scholar
Lafayette, Simone Sette Lopes Google Scholar
Pereira, Gustavo José da Silva Autor UNIFESP Google Scholar
Hirata, Hanako Autor UNIFESP Google Scholar
Garcez-do-Carmo, Lúcia Autor UNIFESP Google Scholar
Smaili, Soraya Soubhi Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de Pernambuco (UFPE)
Abstract Aims: Mitochondria are important modulators of Ca2+ homeostasis. However, it is not clear if they modulate and participate in smooth muscle signaling and contraction. the aim of the present work was to investigate the role of mitochondria in Ca2+ transients and contraction induced by metabotropic muscarinic receptor activation in rat gastric smooth muscle.Main methods: Carbachol (CC11)-induced contraction was investigated in the absence or presence of increasing concentration of mitochondrial protonophore, carbonyl cyanide p-(trifluoro-methoxy)phenyl-hydrazone (FCCP), in gastric fundus strips. Ca2+ and mitochondrial membrane potential (Delta Psi m) measurements were performed in primarily cultured gastric smooth muscle cells loaded with FURA-2 or TMRE dyes.Key findings: Results show that CCh (1 mu M)-induced contraction was inhibited by FCCP in a concentration-dependent manner. in cultured smooth muscle cells CCh (1 mu M) caused a cytosolic Ca2+ rise. Preincubation with FCCP strongly inhibited CCh-evoked Ca2+ transients indicating that mitochondria shape intracellular Ca2+ Signals. CCh induced elevations of Delta Psi m in 60% of the individual mitochondrion analyzed.Significance: Taken together our results indicate that CCh induces release of Ca2+ from intracellular stores, which may be modulated by mitochondria. Thus, mitochondria participate of the intracellular Ca2+ homeostasis in muscarinic contraction in gastric fundus smooth muscle. (C) 2011 Elsevier Inc. All rights reserved.
Keywords Calcium
Mitochondria
Smooth muscle
Carbachol
Contraction
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Date 2011-11-21
Published in Life Sciences. Oxford: Pergamon-Elsevier B.V., v. 89, n. 21-22, p. 757-764, 2011.
ISSN 0024-3205 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 757-764
Origin http://dx.doi.org/10.1016/j.lfs.2011.08.003
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000296932100002
URI http://repositorio.unifesp.br/handle/11600/34231

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