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Type: Artigo de periódico
Author: Oshima, M
Leite, GB
Rostelato-Ferreira, S
da Cruz-Hofling, MA
Rodrigues-Simioni, L
Oshima-Franco, Y
Abstract: Polyethylene glycol (PEG) has been widely used as a solvent among other applications. An ideal solvent is one that does not interfere with an in vitro biological system, unless it is a bioactive agent. Herein, a facilitatory neurotransmission effect was exhibited by PEG (20 mu M) in mammalian (67 +/- 12.5%, n = 4) and avian (74 +/- 6.8%, n = 6) neuromuscular preparations. In curarized preparations, PEG did not reverse the neurotransmission blockade induced by D-tubocurarine (D-Tc, 5.8 mu M, n = 6) as promoted by neostigmine (12 mu M, n = 4). A possible presynaptic action of PEG was ruled out, because quantal acetylcholine (ACh) content was similar to the control Tyrode-incubated mammalian preparation. PEG showed improved sarcolemmal sensitivity, both under direct (sarcolemma) and indirect stimulation (motor axon), because it was able to release calcium from the sarcoplasmic reticulum, even when 30 pM dantrolene (n = 5) was previously applied. Neurotransmission decreased at a higher PEG concentration (100 mu M, n = 6) in the depolarized membrane, but it did not alter normal muscle fiber morphology. In addition, it partially recovered twitch tension amplitude (55 +/- 5.7%) after washing the preparations. More than a simple solvent, we suggest that PEG 400 is able to act on the sarcolemmal membrane, probably at the triad level, which is in line with its well-known ability as drug carrier Muscle Nerve 41: 540-546, 2010
Subject: avian preparation
biventer cervicis
mammalian preparation
phrenic nerve-diaphragm muscle
Country: EUA
Editor: John Wiley & Sons Inc
Citation: Muscle & Nerve. John Wiley & Sons Inc, v. 41, n. 4, n. 540, n. 546, 2010.
Rights: fechado
Identifier DOI: 10.1002/mus.21531
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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