Neuroendocrinology

Regulation of Hypothalamic Neurons

Rapid Stimulatory Effects of Brain-Derived Neurotrophic Factor and Neurotrophin-3 on Somatostatin Release and Intracellular Calcium Rise in Primary Hypothalamic Cell Cultures

Marmigère F.a · Choby C.b · Rage F.a · Richard S.b · Tapia-Arancibia L.a

Author affiliations

aLaboratoire de Plasticité Cérébrale, UMR 5102 CNRS, Université Montpellier 2, CC 090, et bIGH, UPR 1142 CNRS, Montpellier, France

Keywords: NeurotrophinsNeurotrophin receptorsSomatostatinCalciumGlutamate

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Neuroendocrinology 2001;74:43–54
https://doi.org/10.1159/000054669

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Article / Publication Details

First-Page Preview
Abstract of Regulation of Hypothalamic Neurons

Published online: July 06, 2001
Issue release date: July 2001

Number of Print Pages: 12
Number of Figures: 9
Number of Tables: 3

ISSN: 0028-3835 (Print)
eISSN: 1423-0194 (Online)

For additional information: https://www.karger.com/NEN

Abstract

Although the long-lasting effects of neurotrophins have been extensively studied, less data are available on their rapid effects, especially on peptide release. In the present report, we investigated rapid effects of neurotrophins on somatostatin release and on intracellular calcium concentration ([Ca2+]i) in primary cultures of hypothalamic neurons. RT-PCR experiments revealed mRNA expression of the three high-affinity neurotrophin receptors tyrosine kinase (Trk) TrkA, TrkB and TrkC, indicating potential responses to their preferential ligands: nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF) and neurotrophin 3 (NT-3), respectively. We demonstrated that BDNF, and to a lesser extent NT-3, induced significant time- and concentration-dependent somatostatin release, while NGF was devoid of any effect. BDNF or NT-3 induction of somatostatin release was inhibited by the Trk inhibitors K-252a and genistein, whereas K-252b, a less effective inhibitor, had no effect. BDNF- and NT-3-induced somatostatin release depended upon extra- and intracellular Ca2+ since it was completely abolished in the presence of the Ca2+ chelators BAPTA (bis-(α-aminophenoxy)-ethane-N,N,N′,N′-tetraacetic acid) or BAPTA-AM (bis-(α-aminophenoxy)-ethane-N,N,N′,N′-tetraacetoxymethylester), respectively. In addition, BDNF and NT-3 induced a sustained and rapid increase in [Ca2+]i which depended on the extracellular Ca2+ concentration. MK-801 (dizocilpine) and tetrodotoxin (TTX) entirely blocked neurotrophin-evoked somatostatin release and [Ca2+]i rise in response to BDNF and NT-3 application in most neurons. Neurotrophin-induced [Ca2+]i rise was completely blocked by K-252a. The present results are consistent with: (1) an indirect effect of neurotrophins on somatostatin release via endogenous glutamate release and subsequent NMDA receptor activation, (2) a major indirect effect of neurotrophins on Ca2+ rise in hypothalamic neurons which very likely occurs through NMDA receptor activation. Taken altogether, these results indicate that BDNF and NT-3 can rapidly affect the activity of hypothalamic neurons.

© 2001 S. Karger AG, Basel



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Article / Publication Details

First-Page Preview
Abstract of Regulation of Hypothalamic Neurons

Published online: July 06, 2001
Issue release date: July 2001

Number of Print Pages: 12
Number of Figures: 9
Number of Tables: 3

ISSN: 0028-3835 (Print)
eISSN: 1423-0194 (Online)

For additional information: https://www.karger.com/NEN

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2001, Vol.74, No. 1

July 2001

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