Comparison of anterior pituitary hormone levels in the inferior petrosal sinuses and peripheral blood in various pituitary disorders during perihypophysial phlebography

1991 ◽  
Vol 124 (3) ◽  
pp. 258-266 ◽  
Author(s):  
Gaetano Lombardi ◽  
Bartolomeo Merola ◽  
Annamaria Colao ◽  
Paolo Miletto ◽  
Giovanni De Chiara ◽  
...  
Keyword(s):  
Peripheral Blood ◽  
Anterior Pituitary ◽  
Pituitary Hormones ◽  
Pituitary Hormone ◽  
Inferior Petrosal Sinus ◽  
Hormone Levels ◽  
Anterior Pituitary Hormone ◽  
Two Factors ◽  
The Right ◽  
Concentration Ratios

Abstract. The present study aimed at evaluating the anterior pituitary hormone levels in the inferior petrosal sinuses and in the peripheral blood of 55 patients affected by various pituitary disorders and undergoing perihypophysial phlebography on neurosurgical indication or for diagnostic purposes. The results indicated that in 6 patients with Cushing's disease and in 4 with hyperprolactinemia the secreting adenoma could be localized by inferior petrosal sinus sampling. Furthermore, the concentrations of all the pituitary hormones were found to be higher in the right and/or in the left inferior petrosal sinus than in peripheral blood, showing a clear gradient between central and peripheral samples. Moreover, the evaluation of hormone central/peripheral concentration ratios revealed noteworthy differences, namely, that central/peripheral concentration ratios of GH, ACTH, and PRL were significantly higher than those of TSH, FSH, and LH (p<0.01). On the contrary, no significant differences were found when the concentration ratios of GH, ACTH and PRL or TSH, FSH and LH were compared among themselves. This finding may be attributed to at least two factors: the increased pulsatility and the relatively short biological halftime of polypeptic hormones (GH, ACTH, and PRL) compared with glycoprotein hormones (TSH, FSH, and LH).

Vasopressin as a neuroendocrine regulator of anterior pituitary hormone secretion

1993 ◽  
Vol 129 (6) ◽  
pp. 489-496 ◽  
Author(s):  
Andreas Kjær
Keyword(s):  
Arginine Vasopressin ◽  
Mode Of Action ◽  
Anterior Pituitary ◽  
Hormone Secretion ◽  
Pituitary Hormones ◽  
Pituitary Hormone ◽  
Anterior Pituitary Hormones ◽  
Anterior Pituitary Hormone

Secretion of the anterior pituitary hormones adrenocorticotropin (ACTH), β-endorphin and prolactin (PRL) is complex and involves a variety of factors. This review focuses on the involvement of arginine-vasopressin (AVP) in neuroendocrine regulation of these anterior pituitary hormones with special reference to receptor involvement, mode of action and origin of AVP. Arginine-vasopressin may act via at least two types of receptors: V1− and V2−receptors, where the pituitary V1−receptor is designated V1b. The mode of action of AVP may be mediating, i.e. anterior pituitary hormone secretion is transmitted via release of AVP, or the mode of action may be permissive, i.e. the presence of AVP at a low and constant level is required for anterior pituitary hormones to be stimulated. Under in vivo conditions, the AVP-induced release of ACTH and β-endorphin is mainly mediated via activation of hypothalamic V1− receptors, which subsequently leads to the release of corticotropin-releasing hormone. Under in vitro conditions, the AVP-stimulated release of ACTH and β-endorphin is mediated via pituitary V1b− receptors. The mode of action of AVP in the ACTH and β-endorphin response to stress and to histamine, which is involved in stress-induced secretion of anterior pituitary hormones, is mediating (utilizing V1− receptors) as well as permissive (utilizing mainly V1− but also V2−receptors). The AVP-induced release of PRL under in vivo conditions is conveyed mainly via activation of V1−receptors but V2−receptors and probably additional receptor(s) may also play a role. In stress- and histamine induced PRL secretion the role of AVP is both mediating (utilizing V1 −receptors) and permissive (utilizing both V1− and V2− receptors). Arginine-vasopressin may be a candidate for the PRL-releasing factor recently identified in the posterior pituitary gland. Arginine-vasopressin of both magno- and parvocellular origin may be involved in the regulation of anterior pituitary hormone secretion and may reach the corticotrophs and the lactotrophs via three main routes: the peripheral circulation, the long pituitary portal vessels or the short pituitary portal vessels.

Multiple pituitary hormone gradients from inferior petrosal sinus sampling in Cushing's disease

1988 ◽  
Vol 119 (1) ◽  
pp. 75-80 ◽  
Author(s):  
Patricia A. Crock ◽  
Richard G. Pestell ◽  
Anthony J. Calenti ◽  
Eric J. Gilford ◽  
J. Keith Henderson ◽  
...  
Keyword(s):  
Cushing’S Disease ◽  
Anterior Pituitary ◽  
Close Association ◽  
Pituitary Hormones ◽  
Cushing's Disease ◽  
Pituitary Hormone ◽  
Inferior Petrosal Sinus ◽  
The Novel ◽  
Inferior Petrosal Sinus Sampling ◽  
Left And Right

Abstract. Pre-operative bilateral simultaneous inferior petrosal sinus sampling with assessment of ACTH levels in the left and right sinuses and the periphery was performed in 9 patients with pituitary dependent Cushing's disease who were subsequently found at surgery to have basophil microadenomata. The novel observation of this study was the pattern of secretion of other pituitary hormones so that significant inter-sinus gradients ≥ 1.4:1 were seen for β-endorphin (2.8 ± 1.3, mean ± sem), PRL (4.2 ± 1.3) and GH (6.9 ± 2.4) as well as for ACTH (5.1 ± 1.1). There was no inter-sinus gradient for LH, FSH and TSH. In these 9 patients with adenomata, the correlations between the inter-sinus gradients for ACTH and β-endorphin were r = 0.95 (P <0.01), ACTH and PRL r = 0.90 (P < 0.01) and for ACTH and GH r = 0.89 (P <0.05). This close association between the gradients for ACTH and other anterior pituitary hormones could be due either to cosecretion of β-endorphin, PRL and GH by the ACTH-producing pituitary adenomata or to a paracrine effect of β-endorphin from the tumours on adjacent pituitary tissue. By reflecting the central pituitary hormone milieu, petrosal sinus sampling can give information about pituitary function unobtainable from peripheral hormone levels.

Toward Multifactorial Hypothalamic Regulation of Anterior Pituitary Hormone Secretion

Physiology ◽  
1999 ◽  
Vol 14 (2) ◽  
pp. 54-58
Author(s):  
W. R. Crowley
Keyword(s):  
Neuropeptide Y ◽  
Anterior Pituitary ◽  
Hormone Secretion ◽  
Pituitary Hormones ◽  
Gonadotropin Releasing Hormone ◽  
Pituitary Hormone ◽  
Anterior Pituitary Hormone ◽  
Hypothalamic Hormones ◽  
Hypothalamic Regulation ◽  
Hypophysial Portal

The hypothalamus regulates the secretion of anterior pituitary hormones via release of releasing hormones into the hypophysial portal vasculature. Additional neuromessengers act at the pituitary to modulate responses to the hypothalamic hormones. For example, neuropeptide Y enhances the effect of gonadotropin-releasing hormone and the response to the prolactin-inhibiting hormone dopamine.

3. The mysteries of reproduction

2014 ◽  
pp. 34-47
Author(s):  
Martin Luck
Keyword(s):  
Reproductive Cycle ◽  
Anterior Pituitary ◽  
Pituitary Hormones ◽  
Chorionic Gonadotrophin ◽  
Gender Development ◽  
Pituitary Hormone ◽  
General Effect ◽  
Anterior Pituitary Hormone ◽  
Human Menopausal Gonadotrophin ◽  
And Gender

‘The mysteries of reproduction’ begins with Pergonal (human menopausal gonadotrophin), a hormone preparation extracted from urine which contains pituitary hormones crucial to the reproductive cycle. Prolactin, another anterior pituitary hormone, affects fertility in women, but is also found in many different kinds of animal and has more than 300 different actions. Prolactin has the general effect of controlling the movement of salts and water across membranes, especially in tissues related to the skin. The important roles of hormones—progesterone, chorionic gonadotrophin, prostaglandin, oxytocin, oestrogen, and testosterone—in the reproductive cycle, human and gender development, the menopause, and the ageing process are also described.

Changes in Anterior Pituitary Hormone Levels after Serotonin 1A Receptor stimulation

Endocrinology ◽  
1990 ◽  
Vol 127 (2) ◽  
pp. 567-572 ◽  
Author(s):  
A. DI SCIULLO ◽  
M. T. BLUET-PAJOT ◽  
F. MOUNIER ◽  
C. OLIVER ◽  
B. SCHMIDT ◽  
...  
Keyword(s):  
Anterior Pituitary ◽  
Pituitary Hormone ◽  
Serotonin 1A Receptor ◽  
Receptor Stimulation ◽  
Hormone Levels ◽  
Anterior Pituitary Hormone

scholarly journals Expression and regulation of glucocorticoid-induced leucine zipper in the developing anterior pituitary gland

2008 ◽  
Vol 42 (2) ◽  
pp. 171-183 ◽  
Author(s):  
Laura E Ellestad ◽  
Stefanie A Malkiewicz ◽  
H David Guthrie ◽  
Glenn R Welch ◽  
Tom E Porter
Keyword(s):  
Pituitary Gland ◽  
Anterior Pituitary ◽  
Leucine Zipper ◽  
Pituitary Hormones ◽  
Neuroendocrine System ◽  
Pituitary Hormone ◽  
Pituitary Cells ◽  
Mrna Levels ◽  
Anterior Pituitary Hormone

The expression profile of glucocorticoid-induced leucine zipper (GILZ) in the anterior pituitary during the second half of embryonic development in the chick is consistent with in vivo regulation by circulating corticosteroids. However, nothing else has been reported about the presence of GILZ in the neuroendocrine system. We sought to characterize expression and regulation of GILZ in the chicken embryonic pituitary gland and determine the effect of GILZ overexpression on anterior pituitary hormone levels. Pituitary GILZ mRNA levels increased during embryogenesis to a maximum on the day of hatch, and decreased through the first week after hatch. GILZ expression was rapidly upregulated by corticosterone in embryonic pituitary cells. To determine whether GILZ regulates hormone gene expression in the developing anterior pituitary, we overexpressed GILZ in embryonic pituitary cells and measured mRNA for the major pituitary hormones. Exogenous GILZ increased prolactin mRNA above basal levels, but not as high as that in corticosterone-treated cells, indicating that GILZ may play a small role in lactotroph differentiation. The largest effect we observed was a twofold increase in FSH β subunit in cells transfected with GILZ but not treated with corticosterone, suggesting that GILZ may positively regulate gonadotroph development in a manner not involving glucocorticoids. In conclusion, this is the first report to characterize avian GILZ and examine its regulation in the developing neuroendocrine system. We have shown that GILZ is upregulated by glucocorticoids in the embryonic pituitary gland and may regulate expression of several pituitary hormones.

scholarly journals Estrogen mediates sex differences in preoptic neuropeptide and pituitary hormone production in medaka

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Junpei Yamashita ◽  
Yuji Nishiike ◽  
Thomas Fleming ◽  
Daichi Kayo ◽  
Kataaki Okubo
Keyword(s):  
Anterior Pituitary ◽  
Pituitary Hormones ◽  
Pituitary Hormone ◽  
Sexually Dimorphic ◽  
Hormone Production ◽  
Anterior Pituitary Hormones ◽  
Vertebrate Brain ◽  
Pituitary Adenylate Cyclase ◽  
Evolutionarily Conserved ◽  
Sexually Dimorphic Expression

AbstractThe preoptic area (POA) is one of the most evolutionarily conserved regions of the vertebrate brain and contains subsets of neuropeptide-expressing neurons. Here we found in the teleost medaka that two neuropeptides belonging to the secretin family, pituitary adenylate cyclase-activating polypeptide (Pacap) and vasoactive intestinal peptide (Vip), exhibit opposite patterns of sexually dimorphic expression in the same population of POA neurons that project to the anterior pituitary: Pacap is male-biased, whereas Vip is female-biased. Estrogen secreted by the ovary in adulthood was found to attenuate Pacap expression and, conversely, stimulate Vip expression in the female POA, thereby establishing and maintaining their opposite sexual dimorphism. Pituitary organ culture experiments demonstrated that both Pacap and Vip can markedly alter the expression of various anterior pituitary hormones. Collectively, these findings show that males and females use alternative preoptic neuropeptides to regulate anterior pituitary hormones as a result of their different estrogen milieu.

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