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      Electrophysiological Recordings from Gonadotrophs

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          The electrophysiological properties of gonadotrophs have been studied in vitro, using the ovine adenohypophyseal pars tuberalis as a naturally enriched source of this cell type. Trypsin-dispersed pars tuberalis cells maintained in primary tissue culture had a membrane potential of -72 ± 4 mV (mean ± SEM) and an input resistance of 314 ± 38 MΩ. Spontaneous action potentials were not observed; however, a single spike could be induced by depolarizing current injection. The hypophysiotrophic peptide gonadotrophin-releasing hormone (GnRH) increased membrane voltage fluctuations, but these fluctuations (± 5–10 mV) did not induce action potentials or changes in membrane potential or resistance. Power spectra obtained from analysis of this noise indicated that the fundamental event underlying GnRH action has a mean life-time of 38.4 ± 4.5 ms. The obervations that cells incubated in recording medium secreted luteinizing hormone in response to GnRH and that the GnRH-induced increase in voltage noise was inhibited by Ca<sup>2+</sup> channel antagonists support the hypotheses (1) that gonadotrophin secretion is initiated by GnRH-induced Ca<sup>2+</sup> channel activation and (2) that action potentials are not a prerequisite for gonadotrophin release.

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          Author and article information

          S. Karger AG
          28 March 2008
          : 41
          : 3
          : 258-268
          Department of Neuroendocrinology, AFRC Institute of Animal Physiology, Babraham, Cambridge, UK
          124186 Neuroendocrinology 1985;41:258–268
          © 1985 S. Karger AG, Basel

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          Pages: 11
          Original Paper


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