The periventricular nucleus is a thin sheet of small neurons located in the wall of the third ventricle, a composite structure of the hypothalamus. It functions in analgesia.
It is located in the rostral, intermediate, and caudal regions of the hypothalamus. The rostral region aids in the production of both somatostatin and thyroid releasing hormone. The intermediate portion aids in production of thyroid releasing hormone, somatostatin, leptin, gastrin, and neuropeptide y. In humans and primates it also produces GnRH. Lastly the caudal region aids in sympathetic nervous system regulation, and is regarded as the rage center. The periventricular nucleus does not have an effective blood–brain barrier.
11β-HSD2 expression turns cortisol into cortisone.
This nucleus has been shown to affect the release of GnRH (gonadotropin-releasing hormone) in several ways. One way is its expression of neuropeptide Y, which has an impact on the hypothalamic pathway responsible for GnRH secretion. The periventricular nucleus has also been shown to have many neurons that express kisspeptin, which generates a surge in LH, which ultimately leads to the release of GnRH. In female rats, there is a greater expression of estrogen receptor beta in the periventricular nuclear cells, which is thought to lead to different levels of LH secretion in males and females.
This region has been shown to aid in the production of somatostatin and research shows that neurons releasing somatostatin are stimulated to do so by glutamatergic innervation and then this allows them to inhibit the release of growth hormone. There is thought to be a differential level of secretion of somatostatin between males and females by the periventricular nucleus and that is thought to be responsible for the sexual dimorphism of growth hormone secretion. It has also been suggested that leptin secretion also plays a role in the release of GH from periventricular nucleus and that this hormone interacts with both somatostatin and growth hormone-releasing hormone (GHRH) in the GH release pathway.
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Growth hormone–releasing hormone (GHRH), also known as somatocrinin or by several other names in its endogenous forms and as somatorelin (INN) in its pharmaceutical form, is a releasing hormone of growth hormone (GH). It is a 44-amino acid peptide hormone produced in the arcuate nucleus of the hypothalamus. GHRH first appears in the human hypothalamus between 18 and 29 weeks of gestation, which corresponds to the start of production of growth hormone and other somatotropes in fetuses.
The arcuate nucleus of the hypothalamus (also known as ARH, ARC, or infundibular nucleus) is an aggregation of neurons in the mediobasal hypothalamus, adjacent to the third ventricle and the median eminence. The arcuate nucleus includes several important and diverse populations of neurons that help mediate different neuroendocrine and physiological functions, including neuroendocrine neurons, centrally projecting neurons, and astrocytes.
Somatostatin, also known as growth hormone-inhibiting hormone (GHIH) or by several other names, is a peptide hormone that regulates the endocrine system and affects neurotransmission and cell proliferation via interaction with G protein-coupled somatostatin receptors and inhibition of the release of numerous secondary hormones. Somatostatin inhibits insulin and glucagon secretion. Somatostatin has two active forms produced by the alternative cleavage of a single preproprotein: one consisting of 14 amino acids (shown in infobox to right), the other consisting of 28 amino acids.
Covers the development of the central nervous system and the secretion of growth hormone, along with the treatment of acromegaly using somatostatin analogs.
The hypothalamus plays an essential role in the central nervous system of mammals by among others regulating glucose homeostasis, food intake, temperature, and to some extent blood pressure. Assessments of hypothalamic metabolism using, e.g. 1H MRS in mous ...
Leptin is a hormone which is produced in adipose tissue and which plays a role in the regulation of energy homeostasis. The expression of the ob gene, encoding leptin, is under multi-hormonal control. We have shown previously that high doses of glucocortic ...