Osmotic and volemic regulation of plasma arginine vasotocin in conscious domestic fowl

1986 ◽  
Vol 250 (4) ◽  
pp. R644-R657
Author(s):  
J. N. Stallone ◽  
E. J. Braun
Keyword(s):  
Antidiuretic Hormone ◽  
Domestic Fowl ◽  
Hormone Secretion ◽  
Plasma Osmolality ◽  
Arginine Vasotocin ◽  
Antidiuretic Hormone Secretion ◽  
Primary Determinant ◽  
Plasma Arginine ◽  
Highly Correlated ◽  
Secretory System

Recently developed radioimmunoassay methods were utilized to quantitatively characterize secretion of the avian antidiuretic hormone [arginine vasotocin (AVT)] by the hypothalamo-neurohypophyseal system (HNS) of the conscious domestic fowl. The functional characteristics of the osmoreceptor-HNS were evaluated during independent experimental manipulations of extracellular osmolality or volume. Simultaneous measurements of plasma AVT (PAVT) and either plasma osmolality (Posm) or blood volume (BV) in these experiments permitted determination of osmoreceptor sensitivity to independent osmotic or volemic stimuli and set point of the AVT secretory system under conditions of normal hydration. In normally hydrated birds, PAVT and Posm averaged 2.7 +/- 0.2 microU/ml (12.9 +/- 1.0 pg/ml) and 308.1 +/- 0.6 mosmol/kg H2O, respectively (means +/- SE). Characterization of AVT secretion revealed that Posm is a primary determinant of AVT secretion by the HNS of the domestic fowl. Highly correlated and significant relationships between Posm and PAVT exist both above and below the observed basal Posm of normally hydrated birds, with an apparent osmotic threshold for AVT secretion at a Posm of 288.8 mosmol/kg H2O. Analysis of the data also suggested that the HNS is insensitive to changes in BV less than or equal to 10%, because neither isotonic expansion nor reduction of BV altered PAVT. Comparison of past and present avian data with that of the mammalian HNS indicates that 1) the osmotic regulation of antidiuretic hormone secretion is qualitatively and quantitatively similar in birds and mammals, and 2) the volemic regulation of antidiuretic hormone secretion is substantially more important in mammals than in birds.

Regulation of plasma arginine vasotocin in conscious water-deprived domestic fowl

1986 ◽  
Vol 250 (4) ◽  
pp. R658-R664 ◽  
Author(s):  
J. N. Stallone ◽  
E. J. Braun
Keyword(s):  
Antidiuretic Hormone ◽  
Fluid Balance ◽  
Intravenous Infusion ◽  
Domestic Fowl ◽  
Water Deprivation ◽  
Extracellular Volume ◽  
Plasma Osmolality ◽  
Arginine Vasotocin ◽  
Plasma Arginine

Radioimmunoassay methods were employed to quantitatively characterize secretion of the avian antidiuretic hormone [arginine vasotocin (AVT)] by the hypothalamo-neurohypophyseal system (HNS) of the conscious domestic fowl in response to chronic dehydration. Water deprivation permitted characterization of AVT secretion in response to the combined stimuli of extracellular hyperosmolality and hypovolemia; the subsequent repletion of extracellular volume permitted separation of potential osmotic and volemic factors involved in the regulation of AVT secretion. In normally hydrated birds, plasma AVT (PAVT) and plasma osmolality (Posm) averaged 2.2 +/- 0.3 microU/ml (10.5 +/- 1.4 pg/ml) and 309.3 +/- 0.7 mosmol/kg H2O, respectively (means +/- SE). With water deprivation, PAVT and Posm of the birds increased in parallel in a curvilinear manner to maxima of 13.1 +/- 0.6 microU/ml (62.4 +/- 2.9 pg/ml) and 346.6 +/- 2.0 mosmol/kg H2O, respectively, at 96 h of dehydration. The isosmotic repletion of extracellular volume at 96 h by acute intravenous infusion failed to alter 96-h PAVT values. The results indicate that AVT secretion is closely linked to the state of hydration during negative fluid balance in the domestic fowl. Analysis of the data indicated that increases in PAVT that occur with dehydration are mediated primarily by extracellular hyperosmolality and that the HNS of the domestic fowl is relatively insensitive to the simultaneous hypovolemia incurred with fluid deprivation.

The occurrence of nephrogenic diabetes insipidus in domestic fowl

1989 ◽  
Vol 256 (4) ◽  
pp. F639-F645 ◽  
Author(s):  
E. J. Braun ◽  
J. N. Stallone
Keyword(s):  
Diabetes Insipidus ◽  
Antidiuretic Hormone ◽  
Domestic Fowl ◽  
Nephrogenic Diabetes Insipidus ◽  
Water Deprivation ◽  
Plasma Osmolality ◽  
Urine Osmolality ◽  
Arginine Vasotocin ◽  
Basal Plasma ◽  
Response To Water

Nephrogenic diabetes insipidus (NDI) results from an inability of the kidney to concentrate the urine. The underlying cause of NDI is the failure of the collecting ducts to respond to antidiuretic hormone, however, the specific tubular defect is not well understood. In the present investigation an apparent case of NDI was studied in a strain of White Leghorn domestic fowl. In this strain, water intake of the males equaled 24.0% (controls 5.4%) of their body mass (BM) per day while that of the females equaled 51.4% (controls 11.7%) of their BM per day. Plasma osmolality (mosmol/kgH2O) of the NDI birds was significantly higher than that of controls (males 319 +/- 1.7 vs. 311 +/- 1.2; females 323 +/- 1.5 vs. 310 +/- 2.2). Urine osmolality of NDI birds was substantially lower than that of controls (males 90 +/- 6.2 vs. 524 +/- 4.0; females 70 +/- 4.7 vs. no value). In response to water deprivation, plasma osmolality of the NDI birds increased more markedly than that of the control animals (males 357 +/- 2.5 vs. 331 +/- 1.2; females 375 +/- 6.0 vs. 348 +/- 1.4 at 48 h of water deprivation). Basal plasma antidiuretic hormone (plasma arginine vasotocin, PAVT) levels in male NDI birds (9.9 +/- 0.7 microU/ml) and in female NDI birds (7.0 +/- 0.5 microU/ml) were nearly sixfold or nearly threefold higher, respectively, than in control birds. In response to water deprivation, PAVT of both NDI and control birds increased to similar levels, although the absolute increases in PAVT levels were substantially less in NDI birds.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Small cell carcinoma of the cervix complicated by syndrome of inappropriate antidiuretic hormone secretion: a case report

2021 ◽  
Vol 49 (2) ◽  
pp. 030006052098565
Author(s):  
Cai-Fu Zhao ◽  
Su-Fen Zhao ◽  
Ze-Qing Du
Keyword(s):  
Cell Carcinoma ◽  
Antidiuretic Hormone ◽  
Small Cell Carcinoma ◽  
Poor Prognosis ◽  
Hormone Secretion ◽  
Clinical Manifestations ◽  
Small Cell ◽  
Laboratory Examination ◽  
Inappropriate Antidiuretic Hormone Secretion ◽  
Antidiuretic Hormone Secretion

Small cell carcinoma of the cervix is a rare malignant tumor in the clinical setting. Clinical manifestations of this tumor are mostly similar to those of normal types of cervical cancer. Small cell carcinoma of the cervix only shows symptoms of neuroendocrine tumors, such as syndrome of inappropriate antidiuretic hormone secretion (SIADH). Most of the hyponatremia caused by SIADH can be managed after removal of the cause. Hyponatremia is a predictor of poor prognosis and can be used as an indicator of partial recurrence. We report a case of small cell carcinoma of the cervix complicated by SIADH. Our patient presented with irregular vaginal bleeding after menopause. After one cycle of chemotherapy, there was trembling of the limbs, and a laboratory examination showed low Na+ and low Cl− levels. After limited water intake, intravenous hypertonic saline, and intermittent diuretic treatment, the patient’s blood Na+ levels returned to normal. After a radical operation, the above-mentioned symptoms disappeared.

scholarly journals Syringomyelia associated with inappropriate antidiuretic hormone secretion

2014 ◽  
Vol 2014 (apr11 1) ◽  
pp. bcr2013202575-bcr2013202575
Author(s):  
P. Barros Alcalde ◽  
A. Gonzalez Quintela ◽  
M. Pena Seijo ◽  
A. Pose-Reino
Keyword(s):  
Antidiuretic Hormone ◽  
Hormone Secretion ◽  
Inappropriate Antidiuretic Hormone Secretion ◽  
Antidiuretic Hormone Secretion
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