Growth hormone-releasing hormone

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## Contents

* 1 Overview
* 2 Relationship to somatostatin
* 3 Sequence
* 4 References

## Overview

[edit | edit source]

Growth-hormone-releasing hormone (GHRH), also known as growth-hormone-releasing factor (GRF or GHRF) or somatocrinin, is a 44-amino acid peptide hormone produced in the arcuate nucleus of the hypothalamus.

GHRH is released from neurosecretory nerve terminals of these arcuate neurons, and is carried by the hypothalamo-hypophysial portal circulation to the anterior pituitary gland where it stimulates growth hormone (GH) secretion. GHRH is released in a pulsatile manner, stimulating similar pulsatile release of GH. In addition, GHRH also promotes slow-wave sleep directly. [1]

## Relationship to somatostatin

[edit | edit source]

The actions of GHRH are opposed by another hypothalamic hormone, somatostatin, also known as "growth-hormone-inhibiting hormone" (GHIH).

Somatostatin is released from neurosecretory nerve terminals of periventricular somatostatin neurons, and is carried by the hypothalamo-hypophysial portal circulation to the anterior pituitary where it inhibits GH secretion by hyperpolarising the somatotropes.

Somatostatin and GHRH are secreted in alternation, giving rise to the markedly pulsatile secretion of GH. However recently it had been discovered that somatostatin does not affect the secretion of GH.[2]

## Sequence

[edit | edit source]

The amino acid sequence of GHRH is:

Tyr - Ala - Asp - Ala - Ile - Phe - Thr - Asn - Ser - Tyr - Arg - Lys - Val - Leu - Gly - Glu - Leu - Ser - Ala - Arg - Lys - Leu - Leu - Gln - Asp - Ile - Met - Ser - Arg - Glu - Gln - Gly - Glu - Ser - Asn - Gln - Glu - Arg - Gly - Ala - Arg - Ala - Arg - LeuNH2

## References

[edit | edit source]

1. ↑ Obál F, Krueger J (2001). "The somatotropic axis and sleep". Rev Neurol (Paris). 157 (11 Pt 2): S12–5. PMID 11924022.
2. ↑ Dimaraki E, Jaffe C, Demott-Friberg R, Russell-Aulet M, Bowers C, Marbach P, Barkan A (2001). "Generation of growth hormone pulsatility in women: evidence against somatostatin withdrawal as pulse initiator". Am J Physiol Endocrinol Metab. 280 (3): E489–95. PMID 11171604.CS1 maint: Multiple names: authors list (link)  Paper

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Hormones

Endocrine
glands|

| Hypothalamic-
pituitary|

| Hypothalamus|

* GnRH
* TRH
* Dopamine
* CRH
* GHRH
* Somatostatin (GHIH)
* MCH

|

Posterior pituitary|

* Oxytocin
* Vasopressin

Anterior pituitary|

* FSH
* LH
* TSH
* Prolactin
* POMC
* CLIP
* ACTH
* MSH
* Endorphins
* Lipotropin
* GH

Adrenal axis|

* Adrenal cortex
* Aldosterone
* Cortisol
* Cortisone
* DHEA
* DHEA-S
* Androstenedione
* Adrenal medulla
* Epinephrine
* Norepinephrine

Thyroid|

* Thyroid hormones
* T3
* T4
* Calcitonin
* Thyroid axis

Parathyroid|

* PTH

Gonadal axis|

| Testis|

* Testosterone
* AMH
* Inhibin

|

Ovary|

* Estradiol
* Progesterone
* Activin
* Inhibin
* Relaxin
* GnSAF

Placenta|

* hCG
* HPL
* Estrogen
* Progesterone

Pancreas|

* Glucagon
* Insulin
* Amylin
* Somatostatin
* Pancreatic polypeptide

Pineal gland|

* Melatonin
* N,N-Dimethyltryptamine
* 5-Methoxy-N,N-dimethyltryptamine

Other|

| Thymus|

* Thymosins
* Thymosin α1
* Beta thymosins
* Thymopoietin
* Thymulin

|

Digestive system|

| Stomach|

* Gastrin
* Ghrelin

|

Duodenum|

* CCK
* Incretins
* GIP
* GLP-1
* Secretin
* Motilin
* VIP

Ileum|

* Enteroglucagon
* Peptide YY

Liver/other|

* Insulin-like growth factor
* IGF-1
* IGF-2

Adipose tissue|

* Leptin
* Adiponectin
* Resistin

Skeleton|

* Osteocalcin

Kidney|

* Renin
* EPO
* Calcitriol
* Prostaglandin

Heart|

* Natriuretic peptide
* ANP
* BNP

* v
* t
* e

Peptides: neuropeptides

Hormones|

see hormones

Opioid peptides|

| Dynorphins|

* Dynorphin A
* Dynorphin A1–8
* Dynorphin B
* Big dynorphin
* Leumorphin
* α-Neoendorphin
* β-Neoendorphin

|

Endomorphins|

* Endomorphin-1
* Endomorphin-2

Endorphins|

* α-Endorphin
* β-Endorphin
* γ-Endorphin

Enkephalins|

* Met-enkephalin
* Leu-enkephalin

Others|

* Adrenorphin
* Amidorphin
* Hemorphin
* Hemorphin-4
* Nociceptin
* Opiorphin
* Spinorphin
* Valorphin

Other
neuropeptides|

| Kinins|

Bradykinins
Tachykinins: mammal

* Substance P
* Neurokinin A
* Neurokinin B

amphibian

* Kassinin
* Physalaemin

|

Neuromedins|

* B
* N
* S
* U

Orexins|

* A
* B

Other|

* Angiotensin
* Bombesin
* Calcitonin gene-related peptide
* Carnosine
* Cocaine- and amphetamine-regulated transcript
* Delta sleep-inducing peptide
* FMRFamide
* Galanin
* Galanin-like peptide
* Gastrin releasing peptide
* Ghrelin
* Neuropeptide AF
* Neuropeptide FF
* Neuropeptide SF
* Neuropeptide VF
* Neuropeptide S
* Neuropeptide Y
* Neurophysins
* Neurotensin
* Pancreatic polypeptide
* Pituitary adenylate cyclase activating peptide
* RVD-Hpα
* VGF

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