Electrical stimulation induces IL-6 in skeletal muscle through extracellular ATP by activating Ca2+ signals and an IL-6 autocrine loop
Author
dc.contributor.author
Bustamante, Mario
Author
dc.contributor.author
Fernández Verdejo, Rodrigo
Author
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Jaimovich Pérez, Enrique
Author
dc.contributor.author
Buvinic, Sonja
Admission date
dc.date.accessioned
2019-03-15T16:06:35Z
Available date
dc.date.available
2019-03-15T16:06:35Z
Publication date
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2014
Cita de ítem
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American Journal of Physiology - Endocrinology and Metabolism, Volumen 306, Issue 8, 2018,
Identifier
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15221555
Identifier
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01931849
Identifier
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10.1152/ajpendo.00450.2013
Identifier
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https://repositorio.uchile.cl/handle/2250/166159
Abstract
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Interleukin-6 (IL-6) is an important myokine that is highly expressed in skeletal muscle cells upon exercise. We assessed IL-6 expression in response to electrical stimulation (ES) or extracellular ATP as a known mediator of the excitation-transcription mechanism in skeletal muscle. We examined whether the canonical signaling cascade downstream of IL-6 (IL-6/JAK2/STAT3) also responds to muscle cell excitation, concluding that IL-6 influences its own expression through a positive loop. Either ES or exogenous ATP (100 μM) increased both IL-6 expression and p-STAT3 levels in rat myotubes, a process inhibited by 100 μM suramin and 2 U/ml apyrase. ATP also evoked IL-6 expression in both isolated skeletal fibers and extracts derived from whole FDB muscles. ATP increased IL-6 release up to 10-fold. STAT3 activation evoked by ATP was abolished by the JAK2 inhibitor HBC. Blockade of secreted IL-6 with a neutralizing antibody or preincubation with the STAT3 inhibitor VIII reduced STAT3 activatio