What question did this study set out to answer?

To investigate the regulatory role and physiological importance of the neuropeptide galanin in controlling anterior pituitary hormone release.

December 1, 1988Proceedings of the National Academy of SciencesOpen Access

Regulatory role of galanin in control of hypothalamic-anterior pituitary function.

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Authors

AOAnna OttleczNovartis (Switzerland)GSG.D. SnyderRegional Health SMS. M. McCannPennington Biomedical Research Center

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Implication

Experimental study reveals that central galanin tonically stimulates growth hormone release in male rats, suggesting a hypothalamic pathway regulating pituitary secretion.

Key Points

To investigate the regulatory role and physiological importance of the neuropeptide galanin in controlling anterior pituitary hormone release.
Administered synthetic galanin to conscious male rats via the third cerebral ventricle (15–60 pmol) and intravenously (30 or 300 pmol).
Tested direct effects of galanin (1 nM to 1 µM) alone and in combination with GHRH or TRH on hormone secretion in dispersed anterior pituitary cell cultures.
Injected specific galanin antiserum into the third cerebral ventricle of conscious rats to monitor in vivo hormone responses for up to 5 hours.
Third-ventricular galanin induced significant, dose-dependent increases in plasma growth hormone, whereas intravenous administration required a 20-fold higher dose to produce only small, transient elevations.
Galanin did not directly alter growth hormone, prolactin, or thyroid-stimulating hormone release from cultured anterior pituitary cells, confirming that its primary in vivo effects occur via the hypothalamus.
Central injection of galanin antiserum caused plasma growth hormone levels to drop rapidly within 15 minutes and remain suppressed for 5 hours, without decreasing prolactin or thyroid-stimulating hormone.

Cite This Study

Ottlecz et al. (1988) studied this question.

synapsesocial.com/papers/6a76eb183da069e66cbd6c09 https://doi.org/10.1073/pnas.85.24.9861

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Implication

Experimental study reveals that central galanin tonically stimulates growth hormone release in male rats, suggesting a hypothalamic pathway regulating pituitary secretion.

Regulatory role of galanin in control of hypothalamic-anterior pituitary function.

Discussion

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Implication

Key Points

Cite This Study

Regulatory role of galanin in control of hypothalamic-anterior pituitary function.

Discussion

Member takes

Implication

Key Points

Cite This Study

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