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• W4281554920 abstract "The main goal of this study was to determine the effects of arginine vasopressin (AVP) and desmopressin on bladder contractility and to examine whether the effects of these vasopressin receptor (VR) agonists differ in young versus aged animals. These aims were addressed using urinary bladders from young (3 months) and aged (24 month) female Fischer 344 rats that were isolated and dissected into strips for isometric tension recordings. Bladder strips were exposed to AVP and desmopressin through the perfusate, and tension changes recorded. In young rat bladders, AVP, an agonist at both vasopressin-1 receptors (V1Rs) and vasopressin-2 receptor (V2Rs), concentration-dependently caused contraction of bladder strips with a sensitivity that was greater in young versus aged bladder strips. Removal of the mucosa did not alter the sensitivity of young bladder strips to AVP yet enhanced the AVP sensitivity of aged bladder strips. The differential sensitivity to AVP between young denuded and aged denuded bladder strips was similar. In contrast to AVP, desmopressin (V2R selective agonist) relaxed bladder strips. This response was reduced by removal of the mucosa in young, but not aged, bladder strips. These findings support a direct role for VRs in regulating detrusor tone with V1Rs causing contraction and V2Rs relaxation. In aged bladders, the contractile response to V1R activation is attenuated due to release of a mucosal factor that attenuates V1R-induced contractions. Also in aged bladders, the relaxation response to V2R activation is attenuated by lack of release of a mucosal factor that contributes to V2R-induced relaxation. Thus age-associated changes in the bladder mucosa impair the effects of VRs on bladder tone. Because the V2R signaling system is impaired in the older bladder, administering an exogenous V2R agonist (e.g., desmopressin) could counteract this defect. Thus, desmopressin could potentially increase nighttime bladder capacity through detrusor relaxation in concert with decreased urine production, reducing nocturnal voiding frequency." @default.
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• W4281554920 date "2022-06-01" @default.
• W4281554920 modified "2023-10-05" @default.
• W4281554920 title "Effects of vasopressin receptor agonists on detrusor smooth muscle tone in young and aged bladders: Implications for nocturia treatment" @default.
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• W4281554920 doi "https://doi.org/10.1016/j.cont.2022.100032" @default.
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