Growth Hormone & Secretagogue Axis
Definitions related to growth hormone regulation, pituitary signaling, secretagogues, and peptides that influence the GH–IGF-1 axis in research settings.
- Growth Hormone (GH)
- A peptide hormone produced by the pituitary gland that regulates growth, metabolism, tissue repair, and body composition.
- Pituitary Gland
- A small endocrine gland at the base of the brain responsible for releasing growth hormone and other regulatory hormones.
- Growth Hormone–Releasing Hormone (GHRH)
- A hypothalamic peptide that stimulates the pituitary to release growth hormone.
- Somatostatin
- An inhibitory hormone that suppresses growth hormone release, balancing GH secretion.
- Growth Hormone Secretagogue
- A compound that stimulates endogenous growth hormone release through receptor-mediated signaling.
- Ghrelin
- A peptide hormone that binds to the growth hormone secretagogue receptor and stimulates GH release and appetite signaling.
- Growth Hormone Secretagogue Receptor (GHSR)
- A receptor activated by ghrelin and GH secretagogues to promote growth hormone secretion.
- Insulin-Like Growth Factor-1 (IGF-1)
- A downstream mediator of growth hormone effects, primarily produced by the liver and involved in growth and tissue repair.
- GH–IGF-1 Axis
- The hormonal signaling pathway linking growth hormone release to IGF-1 production and systemic biological effects.
- Pulsatile Secretion
- The natural episodic release pattern of growth hormone, characterized by peaks and troughs throughout the day.
- Anabolic Effects
- Physiological processes that promote tissue growth, protein synthesis, and cellular repair.
- Lipolytic Effects
- The stimulation of fat breakdown associated with growth hormone signaling.
- Negative Feedback
- A regulatory mechanism where elevated GH or IGF-1 levels suppress further hormone release.
- Growth Hormone Deficiency
- A condition characterized by insufficient endogenous GH production, studied in both pediatric and adult research contexts.
- Growth Hormone Excess
- Excessive GH signaling associated with abnormal growth and metabolic dysregulation.
- Somatotropic Axis
- Another term for the GH–IGF-1 signaling system governing growth and metabolic regulation.
- Receptor Desensitization
- Reduced receptor responsiveness following prolonged or repeated stimulation.
- Synergistic Signaling
- Enhanced biological effects produced when multiple pathways or compounds act together.