Fast and slow mammalian muscles after denervation
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GIRK channel as a versatile regulator of neurotransmitter release via L-type Ca<sup>2+</sup> channel-dependent mechanism in the neuromuscular junction
2022, NeuropharmacologyCitation Excerpt :Muscle fibers were impaled using two borosilicate glass microelectrodes filled with 2.5-mM KCl with a tip diameter of 1–1.5 μm and 5–10 MΩ resistance. The microelectrodes were positioned within 100 μm from one to another (Albuquerque and McIsaac, 1970; Zakyrjanova et al., 2021). The resting membrane potential was maintained at −60 mV.
Neurophysiological approach to disorders of peripheral nerve
2013, Handbook of Clinical NeurologyCitation Excerpt :The discharges may have regular or irregular intervals and their frequencies may be slow or fast (Buchthal, 1982c). Denervation occurs in connection with changes in muscle fiber plasmalemma including depolarization and the inclusion of abnormal acetylcholine receptors outside the end-plate region (Albuquerque and McIsaac, 1970; Albuquerque et al., 1971; Purves and Sakmann, 1974a; Smith and Thesleff, 1976; Froehner, 1982; Thesleff, 1982), which develop within days to weeks after motor fiber loss – the shorter the distance between the site of the lesion and the muscle, the shorter the time interval. Denervation discharge activity is cyclical (Purves and Sakmann, 1974b; Thesleff, 1982), and it may be absent in up to one-third of denervated muscle fibers at a given time point (Buchthal, 1982c).
Increase of the cytotoxic effect of Bothrops jararacussu venom on mouse extensor digitorum longus and soleus by potassium channel blockers and by Na<sup>+</sup>/K<sup>+</sup>-ATPase inhibition
2008, ToxiconCitation Excerpt :When B. jararacussu venom myotoxic effect was analyzed on denervated muscle, to assess whether the innervation type could be the factor responsible for the different myotoxic responses, we observed that the different rate of CK release in EDL and SOL did not depend on the integrity of innervations even though the denervated muscles had reduced levels of CK. Some previous observations have shown that denervation changes sarcolemmal properties (Albuquerque and McIsaac, 1969; Leung et al., 1986), but our data showed that mouse EDL remains more sensitive to the B. jararacussu venom myotoxic effect in vitro. Whereas all the crotalid venoms induced a higher rate of CK release from EDL than SOL, the elapid venom from Naja naja induced the same rate of CK release from both muscles.
Mechanisms of Neuromuscular Dysfunction in Critical Illness
2008, Critical Care ClinicsCitation Excerpt :If too many sodium channels are inactivated, muscle fibers fail to generate an action potential and become inexcitable. Denervation without steroid treatment causes hyperpolarization of the resting membrane potential that is similar to that seen in SD muscle [45,46], whereas steroid treatment alone does not [43]. It is important to note, however, that depolarization of resting potential following denervation without steroid exposure does not, in and of itself, lead to widespread loss of electrical excitability.
Role of phosphorylation and physiological state in the regulation of the muscular chloride channel ClC-1: A voltage-clamp study on isolated M. interosseus fibers
1999, Biochemical and Biophysical Research Communications
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The authors are grateful to Dr. M. L. Albuquerque for the computer calculation of the membrane electrical constants, and to Miss Käthe Koch for expert technical assistance. This work was supported by grants from the National Institutes of Health (NB-08223 and NB-090661).