Immunohistochemistry was performed as described previously [30 (link)]. Sections of prostates were incubated with rabbit anti-calcitonin gene-related peptide (CGRP) antibody (1:2000; Sigma-Aldrich) followed by Cy3-conjugated anti-rabbit IgG (1:200, Jackson Immunoresearch, WestGrove, PA) to immunostain peptidergic afferent (sensory) fibers. Monocytes and macrophages were stained in other prostate tissue sections using rat anti-F4/80 (1:1000; Abcam, Cambridge, MA) and Cy3-conjugated anti-rat IgG (1:200).