Role of afferent neurons in stress induced degenerative changes of the bladder

Purpose: We investigated the role of afferent C fibers in morphological cha nges of the rat bladder during stress. Materials and Methods: Wistar albino rats were exposed to cold immobilizati on stress. Different routes of capsaicin administration before cold immobil ization stress were studied. Capsaicin was given to neonates, around the va gus (perivagal) or celiac (periceliac), or perivagal plus periceliac. From each group samples of bladder were randomly chosen for morphological evalua tion using electron microscopy. Results: Stress exposure led to pathological changes, including an increase d number of mast cells, degenerated urothelium and dilated tight junctions, in the bladder. Capsaicin given neonatally and around the vagal and celiac ganglia prevented these stress induced degenerative bladder changes. Conclusions: Activation of capsaicin sensitive afferent neurons locally and centrally may be involved in stress related pathological changes in the ra t bladder.