[Effect of thyroliberin on membrane potential and pattern of spontaneous activity of neurons of the respiratory center in rats in vitro].
On frontal brainstem slices of rat by means of whole-clamp recordings, we investigated effects of TRH (10(-8) [symbol: see text]) on membrane potential and firing pattern of the neurones in ventrolateral area of the solitary tract nucleus and pre-Botzinger complex. TRH induced a membrane depolarisation and an increase in spontaneous activity of the respiratory centre neurones. After TRH administration, a shortening of time intervals between the beginning of bursts was found in bursting neurones of the pre-Botzinger complex. In some silent neurones, TRH elicited appearance of firing activity, so the silent neurones of the solitary tract nucleus were transformed into tonic while the silent pre-Botzinger complex neurones were transformed into bursting ones. Thus, there is a direct regulatory effect of TRH on the respiratory centre neurones at the level of their membrane.
Iniushkin
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AN
Samara State University, Samara 443011, 1 Pavlov St., Russia.
D000818:Animals; D066298:In Vitro Techniques; D008297:Male; D008526:Medulla Oblongata / Q000166:cytology / Q000187:drug effects* / Q000502:physiology; D008564:Membrane Potentials / Q000187:drug effects; D008839:Microelectrodes; D009474:Neurons / Q000187:drug effects* / Q000502:physiology; D018408:Patch-Clamp Techniques; D051381:Rats; D017208:Rats, Wistar; D012125:Respiratory Center / Q000166:cytology / Q000187:drug effects* / Q000502:physiology; D017552:Solitary Nucleus / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D013973:Thyrotropin-Releasing Hormone / Q000494:pharmacology*
D013973:Thyrotropin-Releasing Hormone