Autonomic dysregulation at multiple sites is implicated in age-associated underactive bladder in female mice

Autor(es)

de Oliveira, Mariana Goncalves ^[1] ; Alexandre, Eduardo Costa ^[1] ; Bonilla-Becerra, Sandra Milena ^[1] ; Bertollotto, Gabriela Maria ^[1] ; Oliveira Justo, Alberto Fernando ^[1] ; Monica, Fabiola Zakia ^[1] ; Antunes, Edson ^[1]

Afiliação do(s) autor(es)

^[1] State Univ Campinas UNICAMP, Fac Med Sci, Dept Pharmacol, BR-13084971 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NEUROUROLOGY AND URODYNAMICS; v. 38, n. 5, p. 1212-1221, JUN 2019.
• Citações Web of Science: 0

Resumo

Aims To evaluate the functional and molecular alterations of contractile and relaxant machinery in the bladder and urethra that lead to the underactive bladder (UAB) in old female mice. Methods Female young (3-months) and old (18-months) C57BL/6 mice were used. Urodynamic was assessed in awake and anaesthetized mice. Electrical-field stimulation (EFS) and concentration-response curves to contractile and relaxing agents in isolated bladders and urethras were performed. Messenger RNA (mRNA) expressions of muscarinic, adrenergic, and transient receptor potential vanilloid-4 (TRPV4), and of the enzymes tyrosine hydroxylase and neuronal nitric oxide synthase (nNOS) were determined. Bladder cyclic adenosine monophosphate (cAMP) levels were measured. Results Cystometry in old mice showed incapacity to produce bladder emptying. On filter paper, old mice showed reduced urinary spots. Compared to the young group, bladder contractions induced by EFS and carbachol were lower in old mice. The beta(3)-adrenoceptor agonist mirabegron promoted higher bladder relaxation and elevation of cAMP levels in old mice. In old mice urethras, the alpha(1a)-adrenoceptor agonist phenylephrine produced higher contractions, but no differences were found for the NO donor sodium nitroprusside-induced relaxations. In old mice, increased mRNA expressions of beta(3)- and alpha(1a)-adrenoceptors in bladder and urethra were found, respectively, whereas the muscarinic M-2 and M-3 receptors and beta(2)-adrenoceptors did not change between groups. Reduced mRNA expressions of tyrosine hydroxylase and nNOS were found in old mouse urethras. Additionally, TRPV4 expression was reduced in bladder urothelium from old mice. Conclusion Age-associated mouse UAB is the result of autonomic dysfunction at multiple levels leading to the less sensitive and overrelaxed bladder, along with urethral hypercontractility. (AU)

• Processo FAPESP: 17/15175-1 - Modulação da guanilato ciclase solúvel e dos níveis intracelulares de nucleotídeos cíclicos em órgãos do trato urinário inferior e próstata
• Beneficiário: Edson Antunes
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/09765-3 - Disfunção miccional e prostática em ratos de meia-idade e camundongos obesos: enfoque na NADPH oxidase (NOx)
• Beneficiário: Mariana Gonçalves de Oliveira Taranto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado