GABA supplementation and growth hormone response

Area of Science:

• Neuroendocrinology
• Neuroscience
• Physiology

Background:

• Growth hormone (GH) secretion is regulated by hypothalamic hormones like GH-releasing hormone and somatostatin.
• Neurotransmitters modulate these hormones, acting as final mediators of GH release.
• Gamma-aminobutyric acid (GABA) has been investigated for its role in GH secretion control.

Purpose of the Study:

• To explore the role of GABA in regulating GH secretion.
• To examine the anatomical basis for GABA's influence on the hypothalamic-pituitary axis.
• To discuss the potential ergogenic benefits of oral GABA supplementation.

Main Methods:

• Review of experimental and clinical evidence on GABA's effects on GH secretion.
• Analysis of GABAergic neuron locations within the hypothalamus and pituitary.
• Investigation of GABA's dual action at central and pituitary levels.

Main Results:

• GABAergic neurons are present in the hypothalamus, with evidence suggesting secretion within the pituitary.
• GABA administration, degradation inhibition, and transmission blockade affect GH secretion.
• Evidence supports a dual action of GABA, with central and pituitary sites mediating opposing effects on GH release.

Conclusions:

• GABA exerts both central and direct pituitary influences on GH secretion, potentially explaining varied findings.
• Understanding GABA's complex role is crucial for neuroendocrine research.
• Potential ergogenic effects of GABA supplementation warrant further investigation.