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Long‐term treatment with the beta‐3 adrenoceptor agonist, mirabegron ameliorates detrusor overactivity and restores cyclic adenosine monophosphate (cAMP) levels in obese mice
Author(s) -
Calmasini Fabiano B.,
de Oliveira Mariana G.,
Alexandre Eduardo C.,
da Silva Fábio H.,
da Silva Carmem P.V.,
Candido Tuany Z.,
Antunes Edson,
Mónica Fabíola Z.
Publication year - 2017
Publication title -
neurourology and urodynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 90
eISSN - 1520-6777
pISSN - 0733-2467
DOI - 10.1002/nau.23171
Subject(s) - mirabegron , endocrinology , medicine , cyclic adenosine monophosphate , carbachol , stimulation , agonist , overactive bladder , receptor , pathology , alternative medicine
Aims To evaluate the effects of the beta‐3 adrenoceptor agonist, mirabegron in a mouse model of detrusor overactivity induced by obesity. Methods C57BL/6 male mice were fed with standard chow or high‐fat diet for 12 weeks. Lean and obese mice were treated orally with mirabegron (10 mg/kg/day) from the last 2 weeks of diet. Cystometric evaluations, functional assays, protein expression for phosphodiesterase type 4 (PDE4), and cyclic adenosine monophosphate (cAMP) measurement were carried out. Results In obese mice the body weight, epididymal fat mass, fasting glucose, and low‐density lipoprotein (LDL) levels were higher ( P < 0.001) than in the lean mice. A reduction of 34% and 54% and an increase of 35% in the epididimal fat, LDL, and HDL levels ( P < 0.05), respectively, were observed in the obese group treated with mirabegron, whereas no changes were seen in the lipid profile from lean mice. Obese group showed irregular micturition pattern, characterized by significant increases in frequency and non‐void contractions. Carbachol, potassium chloride, and electrical‐field stimulation induced detrusor smooth muscle (DSM) contractions, which were greater in bladders from obese mice than from lean mice. Two‐week treatment with mirabegron restored all the contractile response alterations in the DSM. Basal intracellular levels of cAMP were reduced (68%), whereas PDE4 protein expression was increased (54%) in bladder from obese mice. Mirabegron restored the cAMP levels in obese bladder, without changing the PDE4 expression. Conclusion Mirabegron was able to completely restore the urinary alterations seen in the bladder from obese mice.