Cycling Cross-Bridges Contribute to Thin Filament Activation in Human Slow-Twitch Fibers.
human striated muscle
myosin
regulation of muscle contraction
skinned fibers
slow-twitch muscle
thick filament
thin filament
troponin
Journal
Frontiers in physiology
ISSN: 1664-042X
Titre abrégé: Front Physiol
Pays: Switzerland
ID NLM: 101549006
Informations de publication
Date de publication:
2020
2020
Historique:
received:
24
10
2019
accepted:
11
02
2020
entrez:
9
4
2020
pubmed:
9
4
2020
medline:
9
4
2020
Statut:
epublish
Résumé
It has been shown that not only calcium but also strong binding myosin heads contribute to thin filament activation in isometrically contracting animal fast-twitch and cardiac muscle preparations. This behavior has not been studied in human muscle fibers or animal slow-twitch fibers. Human slow-twitch fibers are interesting since they contain the same myosin heavy chain isoform as the human heart. To explore myosin-induced activation of the thin filament in isometrically contracting human slow-twitch fibers, the endogenous troponin complex was exchanged for a well-characterized fast-twitch skeletal troponin complex labeled with the fluorescent dye N-((2-(Iodoacetoxy)ethyl)-N-methyl)amino-7-nitrobenz-2-oxa-1,3-diazole (fsTn-IANBD). The exchange was ≈70% complete (
Identifiants
pubmed: 32265723
doi: 10.3389/fphys.2020.00144
pmc: PMC7105683
doi:
Types de publication
Journal Article
Langues
eng
Pagination
144Informations de copyright
Copyright © 2020 López-Dávila, Chalovich, Zittrich, Piep, Matinmehr, Málnási-Csizmadia, Rauscher, Kraft, Brenner and Stehle.
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