Publication Date:
1979-05-04
Description:
The effects of thyrotropin-releasing hormone and 17 beta-estradiol on the electrical membrane properties of a prolactin-secretin pituitary cell line (GH3/B6) were studied with intracellular microelectrode recordings. Of the cells tested, 50 percent were excitable and displayed calcium-dependent action potentials when depolarized. When injected directly on the membrane of an excitable cell, thyrotropin-releasing hormone and 17 beta-estradiol induced action potentials within 1 minute. The spiking activity was preceded by a progressive increase of the input resistance without any detectable change in the resting membrane polarization. The results reveal a rapid effect of both substances on the membrane of GH3/B6 cells. In the case of thyrotropin-releasing hormone, which has both a short-term effect on release of prolactin and a long-term effect on its synthesis, the induced electrical activity may be associated with the stimulation of prolactin production. The physiological implication of 17 beta-estradiol-induced, calcium-dependent spiking activity remains to be elucidated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dufy, B -- Vincent, J D -- Fleury, H -- Du Pasquier, P -- Gourdji, D -- Tixier-Vidal, A -- New York, N.Y. -- Science. 1979 May 4;204(4392):509-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/107590" target="_blank"〉PubMed〈/a〉
Keywords:
Action Potentials/drug effects
;
Cell Line
;
Cell Membrane/drug effects
;
Estradiol/*pharmacology
;
Pituitary Gland/*drug effects
;
Stimulation, Chemical
;
Thyrotropin-Releasing Hormone/*pharmacology
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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