ORIGINAL RESEARCH published: 24 June 2021 doi: 10.3389/fphar.2021.666047 Concentration-dependent alpha1-Adrenoceptor Antagonism and Inhibition of Neurogenic Smooth Muscle Contraction by Mirabegron in the Human Prostate Ru Huang, Yuhan Liu, Anna Ciotkowska, Alexander Tamalunas, Raphaela Waidelich, Frank Strittmatter, Christian G. Stief and Martin Hennenberg* Department of Urology, University Hospital, LMU Munich, Munich, Germany Introduction: Mirabegron is available for treatment of storage symptoms in overactive Edited by: Ebru Arioglu Inan, bladder, which may be improved by β3-adrenoceptor-induced bladder smooth muscle Ankara University, Turkey relaxation. In addition to storage symptoms, lower urinary tract symptoms in men include Reviewed by: obstructive symptoms attributed to benign prostatic hyperplasia, caused by increased Betty Exintaris, Monash University, Australia prostate smooth muscle tone and prostate enlargement. In contrast to the bladder and Fabiola Zakia Mónica, storage symptoms, effects of mirabegron on prostate smooth muscle contraction and State University of Campinas, Brazil obstructive symptoms are poorly understood. Evidence from non-human smooth muscle Fabio Henrique Silva, State University of Campinas, Brazil suggested antagonism of α1-adrenoceptors as an important off-target effect of *Correspondence: mirabegron. As α1-adrenergic contraction is crucial in pathophysiology and medical Martin Hennenberg treatment of obstructive symptoms, we here examined effects of mirabegron on
[email protected] muenchen.de contractions of human prostate tissues and on proliferation of prostate stromal cells. Methods: Contractions were induced in an organ bath. Effects of mirabegron on Specialty section: This article was submitted to proliferation, viability, and cAMP levels in cultured stromal cells were examined by EdU Cardiovascular and Smooth Muscle assays, CCK-8 assays and enzyme-linked immunosorbent assay.