Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P01185 (vasopressin)
 23,126 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effect of quinidine on Na and H+ transport by the turtle bladder and water transport by the toad bladder was examined. Quinidine inhibited the short-circuit current and the potential difference in a dose-dependent fashion. The effect of quinidine on the short-circuit was not dependent on extracellular calcium concentration and was not reversible with removal of the drug. Quinidine inhibited H+ secretion in a dose-dependent fashion. The effect of quinidine on H+ secretion also was not dependent on extracellular calcium concentration and was not reversible, either with removal of the drug or with stimulation of H+ secretion with 5% CO2. The effect of quinidine on Na or H+ transport could not be elicited by an equivalent dose of tetracaine, suggesting that the inhibitory effect of quinidine is not dependent on its anesthetic properties. Quinidine also inhibited vasopressin and cyclic AMP stimulated water flow in the toad bladder. Quinidine did not alter calcium uptake by the turtle bladder but increased calcium efflux by the turtle and toad bladders. These observations suggest that a rise in cytosolic calcium is responsible for the inhibitory effect of quinidine on Na, H+, and water transport.
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PMID:Effect of quinidine on Na, H+, and water transport by the turtle and toad bladders. 625 Dec 23

The effect of peritubular and luminal pH changes on hydraulic conductance, (Lp, 10(-7) cm X s-1 X atm-1) in the isolated perfused rabbit cortical collecting tubule (CCT) was tested at 37 degrees C before and after administration of 20 microU/ml vasopressin or 10(-4) M 8-[p-chlorophenylthio]-adenosine cyclic monophosphate (8-CPT-cAMP). In vasopressin experiments when bath pH was changed from 7.58 to 7.16 or from 7.58 to 6.70, mean Lp decreased from 249 +/- 32 to 199 +/- 23 (n = 5; P less than 0.01) and from 231 +/- 38 to 201 +/- 36 (n = 5; NS), respectively. In contrast, in 8-CPT-cAMP experiments when bath [HCO3] was kept constant while CO2 was elevated the hydroosmotic response was increased. Using 2.5 mM HCO3, Lp at 0.4% CO2 was 275 +/- 15 and at 6% CO2 it was 352 +/- 50 (n = 4; paired t test; P less than 0.05). At 8.5 and 21.5 mM HCO3 raising CO2 from 2 to 13% and from 4 to 32% increased Lp from 237 +/- 71 to 410 +/- 32 (n = 4; paired t test; P less than 0.05) and from 282 +/- 45 to 449 +/- 63 (n = 6; paired t test; P less than 0.001), respectively. Reducing luminal pH from 7.40 to 5.40 had no effect on either vasopressin- or cAMP-induced changes in Lp. Accordingly, lowering the bath pH by increasing the PCO2 at constant [HCO3] markedly stimulates the response to 8-CPT-cAMP, whereas lowering the bath pH by reducing [HCO3] inhibits the vasopressin response.
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PMID:pH effect on osmotic response of collecting tubules to vasopressin and 8-CPT-cAMP. 630 11

A decrease in extracellular pH is well known to inhibit vasopressin stimulated water flow in the toad bladder. It remains unclear whether this inhibition is the result of the effect of extracellular pH per se or the consequence of altered intracellular pH. In the present study we evaluated the effect of several maneuvers capable of altering intracellular pH on vasopressin or cyclic AMP stimulated water flow in the toad bladder in the absence of alterations of extracellular pH. In the presence of a normal extracellular pH, bladders subjected to a high partial pressure of CO2 or bladders from acidotic toads had a significant decrease in vasopressin or cyclic AMP stimulated water flow as compared to controls. We also examined the effect of maneuvers capable of increasing intracellular pH on vasopressin and cyclic AMP stimulated water flow. Intracellular alkalosis was induced by exposing the bladders in vitro to NH4Cl at pH 8 or to acetazolamide. Both maneuvers resulted in a significant decrease in vasopressin, but not in cyclic AMP stimulated water flow. Bladders removed from alkalotic toads, incubated in a normal extracellular pH also showed a decrease in AVP stimulated water flow. Intracellular muscle pH assessed with phosphorus nuclear magnetic resonance, was not different among bladders from control, acidotic and alkalotic toads. It is concluded that alterations of intracellular pH, in the absence of alterations of extracellular pH, are important in regulation of water transport in the toad bladder in response to vasopressin or cyclic AMP. In addition, metabolic acidosis or alkalosis alters AVP or cyclic AMP stimulated water flow by a mechanism independent of the intracellular pH.
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PMID:Acid-base metabolism, intracellular pH and water transport by the toad bladder. 631 61

8-Bromoadenosine 3',5'-cyclic monophosphate [an analogue of adenosine 3',5'-cyclic monophosphate (cAMP), the intracellular mediator for antidiuretic hormone (ADH) action] induces, in frog urinary bladder, an increase in water permeability that is rapidly and reversibly inhibited by cellular acidification. The effect of CO2 bubbling on the simultaneously observed intramembranous particle aggregates, which probably represent water channels, depended on the time that elapsed after changing medium pH: 3 min of CO2 bubbling depressed the water flux by 70%, whereas the membrane surface occupied by the aggregates remained unchanged. On the contrary, after 9-15 min of CO2 bubbling, both the water flux and the surface area occupied by the aggregates were strongly reduced. These results can be interpreted by accepting two post-cAMP levels of action for cellular acidification: 1) the channels themselves that, as previously suggested by ADH experiments at low temperature, would shift their structure from an "open" to a "closed" state, and 2) the mechanism that controlled the aggregates' plug in and removal.
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PMID:Effects of cellular acidification on ADH-induced intramembrane particle aggregates. 632 Jun 54

The effects of vasopressin on the short-term control of fatty acid metabolism were studied in isolated rat hepatocytes. Vasopressin increased the oxidation of oleate to CO2 and decreased the formation of ketones in hepatocytes from Wistar rats, but not from Brattleboro rats. Incubation with vasopressin for 30 min increased the conversion of oleate into triacylglycerol by 17% and 32% in hepatocytes from Wistar and Brattleboro rats respectively. The corresponding increases for the phospholipid fraction were 19% and 42%. When Wistar-rat hepatocytes were incubated with corticosterone for 6 h there was a 19% increase in triacylglycerol synthesis, and a 52% increase if vasopressin was added 30 min before the end of the incubation. Glycerol phosphate acyltransferase activity was not significantly increased by vasopressin. Incubation for 5-60 min with vasopressin increased the Vmax. of phosphatidate phosphohydrolase by 48% and 32% respectively in hepatocytes from Wistar and Brattleboro rats. These increases were antagonized if EGTA was added to the medium used for incubating the hepatocytes. The replacement of vasopressin by 5 microM-ionophore A23187 produced a significant increase of 13% in the phosphohydrolase activity. It is therefore likely that the effects of vasopressin on the phosphohydrolase are mediated by Ca2+. These results are discussed in relation to the possible function of phosphatidate phosphohydrolase in controlling the turnover of phosphoinositides, the synthesis of phosphatidylethanolamine, phosphatidylcholine and triacylglycerol, and the secretion of very-low-density lipoproteins.
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PMID:Effects of vasopressin and corticosterone on fatty acid metabolism and on the activities of glycerol phosphate acyltransferase and phosphatidate phosphohydrolase in rat hepatocytes. 632 Aug 8

A method is described for measuring rates of mitochondrial pyruvate carboxylation in hepatocytes treated with the polyene antibiotic, filipin, to render the plasma membrane permeable to substrates. With this approach it was possible to demonstrate that treatment of cells with glucagon or catecholamines results in a stimulation of mitochondrial CO2 fixation measured in situ comparable with that observed in the isolated mitochondria, in terms of time of onset of the response, hormone selectivity and sensitivity. In addition, angiotensin II and vasopressin were shown to enhance the activity of pyruvate carboxylase in both the intact mitochondria and filipin-treated cells, thus strengthening the postulate that this site is a major locus of hormone action in the control of gluconeogenesis. Addition of 3-mercaptopicolinic acid, to inhibit gluconeogenesis at the level of phosphoenolpyruvate carboxykinase, had no significant effect on the stimulation of pyruvate carboxylation by adrenaline, suggesting that the effect of the hormone at this site is independent of changes in activity of other enzymes further on in the pathway. The data presented preclude the possibility that acute effects of hormones on mitochondrial metabolism are solely artifacts of the preparation procedure.
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PMID:Hormonal stimulation of mitochondrial pyruvate carboxylation in filipin-treated hepatocytes. 641 Oct 66

To test the hypothesis that antidiuretic hormone- (ADH) dependent water permeability is associated with changes in apical membrane area, hormone-dependent water flow and capacitance changes were measured in the toad urinary bladder under a number of different conditions. Dose-response relationships for water flow (Jv) and capacitance increases (delta C) were similar from 1 to 20 mU/ml ADH. At higher concentrations, Jv reached a plateau, while delta C decreased. The decrease in delta C was prevented by elimination of the osmotic gradient across the tissue. Serosal hydrazine (10 mM) increased Jv sevenfold and delta C threefold in the presence of 1 mU/ml ADH. Mucosal NH4Cl, at constant mucosal pH, increased Jv by 50-100%, but did not significantly change delta C. In the absence of an osmotic gradient, mucosal NH+4 increased delta C by 50%. NH4Cl had no effect on hydroosmotic response to 8-bromo-adenosine 3',5'-cyclic monophosphate (cAMP). Mucosal CO2 (9%) decreased Jv by greater than 90%, and delta C by 60% with 20 mU/ml ADH. Mucosal CO2 also inhibited the hydroosmotic response to 8-bromo-cAMP. Removal of serosal Na diminished cAMP-dependent Jv and delta C. The results confirmed the close relationship between ADH-dependent water permeability and membrane capacitance. They indicate, however, that under some circumstances membrane may be retrieved from the apical surface without affecting water permeability.
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PMID:Modulation of antidiuretic hormone-dependent capacitance and water flow in toad urinary bladder. 642 10

Vasopressin decreases blood flow as well as secretory flow in the pancreas. The question raised was whether the blood flow decrease is the determinant of the decrease in secretion or quite the reverse. In pentobarbital anesthetized dogs, secretory flow was first increased to a steady level by infusion of secretin. At this steady state, O2 consumption and O2 extraction were increased, while blood flow remained at the control level, indicating an increase in the area available for exchange i.e. an increase in capillary density. At increasing doses of vasopressin, secretory flow decreased, arterial flow decreased, and O2 extraction increased, while O2 consumption decreased and venous-arterial CO2 concentration difference was not changed. At the same time CO2 transport decreased, CO2 concentration in the secretion was unchanged and CO2 output in the secretion was decreased. The decrease in blood flow was always seen about 25 s before the decrease in secretory flow, strongly suggesting that the decrease in blood flow induced the decrease in secretory flow. A higher dose of vasopressin was required to decrease the O2 consumption (i.e. this effect was less sensitive) than to increase O2 extraction. The decrease in secretory flow and the decrease in blood flow showed an intermediate sensitivity. So O2 consumption seems to be preserved at a high level by the increase in O2 extraction. It is concluded that the vasopressin-induced decrease in blood flow is the determinant of the decrease in secretory flow. This phenomenon is discussed in terms of the model for metabolic control of tissue oxygenation.
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PMID:A vasopressin-induced decrease in pancreatic blood flow and in pancreatic exocrine secretion in the anesthetized dog. 642 52

Hypoxia and hypercapnia have been shown to cause an increase in the concentration of vasopressin in plasma, but their effects on vasopressin in cerebrospinal fluid (CSF) are not known. In addition, the effect of metabolic acidosis on plasma and CSF vasopressin has not been reported. In this study, plasma and CSF vasopressin levels were measured in anesthetized dogs subjected to either hypoxia, hypercapnia, or metabolic acidosis. Rate and depth of respiration were closely regulated with the aid of muscle paralysis and mechanical ventilation. Vasopressin increased markedly in both plasma and CSF during severe hypoxia (10% O2) and during hypercapnia (10% CO2) but did not change during either mild (15% O2) or moderate (12.5% O2) hypoxia. Although mild hypoxia by itself did not affect either plasma or CSF vasopressin, it did potentiate the increase in plasma and CSF vasopressin that was induced by severe hypercapnia, thus suggesting that hypoxia and hypercapnia may exert synergistic effects on vasopressin secretion. Metabolic acidosis produced by slow intravenous infusion of 1 N hydrochloric acid decreased arterial pH to values comparable to those induced by hypercapnia and increased vasopressin in plasma; CSF vasopressin was unchanged. These results are consistent with the concept that the source of vasopressin secreted into plasma may be different from that secreted into CSF.
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PMID:Vasopressin in plasma and cerebrospinal fluid of dogs during hypoxia or acidosis. 649 66

A microsystem for rotation-mediated aggregate cell culture studies has been devised to examine vasopressin (VP) biosynthesis of developing rat hypothalamus. Trypsin-dispersed hypothalamic tissue was placed into 24 well tissue culture dishes and VP content of culture medium and cells was measured over time by a radioimmunoassay. Reaggregates formed within 4 hr when rotated at 70 rpm in a humid CO2 incubator. Nineteen days post coitus (dpc) hypothalamic reaggregates had 336 pg VP/10(6) cells while the medium showed 260 pg VP/ml after four days. Measurable VP was seen in fetal tissue after ten days while comparable amounts of VP were present in one day neonatal hypothalamus over this same period. Morphological examination of reaggregates indicated the presence of viable cells throughout the cell mass after ten days of culture. Co-cultivation studies with dispersed posterior pituitary indicated that reaggregates from one day neonate hypothalamus had significantly increased VP levels when co-cultured with one day neonatal posterior pituitary; however, this effect was not seen with 19 dpc co-cultures. These data demonstrate that development of neurosecretory activity of discrete regions of the hypothalamus can be examined early in vitro in a reaggregate cell culture system.
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PMID:Vasopressin in reaggregated cell cultures of the developing hypothalamus. 660 52


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