GHRH–Somatostatin Regulation of Growth Hormone
Anterior Pituitary, Growth Hormone and Prolactin
GHRH–Somatostatin Regulation of Growth Hormone
GHRH and somatostatin provide complementary control of GH secretion. GHRH stimulates somatotroph activity, while somatostatin inhibits release through receptor-specific pathways.
Different intracellular signals
GHRH prominently engages cyclic AMP-related signaling. Somatostatin commonly engages inhibitory G protein pathways and modifies calcium-dependent secretion.
The balance changes
Their relative activity varies with sleep, nutrients, age and feedback. GH pulses arise from the integrated system rather than from a fixed alternating pattern that is identical in everyone.
Applied interpretation
A change in GH secretion cannot automatically be assigned to only increased GHRH or only reduced somatostatin. Distinguishing their contributions requires an appropriate experimental or dynamic-testing design.
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