RESUMO
Corticotropin releasing factor (CRF) is a neuropeptide expressed in micturition reflex circuitry and different roles in these reflexes have been suggested. These studies examined the expression of CRF/CRF receptors in the urinary bladder during postnatal development in the rat. Urinary bladder was harvested from rats (postnatal (P) day 0-adult) euthanized by isoflurane (4%) and thoracotomy. CRF protein expression significantly (pAssuntos
Hormônio Liberador da Corticotropina/metabolismo
, Fibras Nervosas/metabolismo
, Bexiga Urinária/metabolismo
, Urotélio/metabolismo
, Fatores Etários
, Animais
, Hormônio Liberador da Corticotropina/biossíntese
, Hormônio Liberador da Corticotropina/genética
, Ensaio de Imunoadsorção Enzimática
, Feminino
, Galanina/genética
, Galanina/metabolismo
, Expressão Gênica
, Imuno-Histoquímica
, Masculino
, Neuropeptídeos/genética
, Neuropeptídeos/metabolismo
, Polipeptídeo Hipofisário Ativador de Adenilato Ciclase/genética
, Polipeptídeo Hipofisário Ativador de Adenilato Ciclase/metabolismo
, RNA Mensageiro/genética
, RNA Mensageiro/metabolismo
, Ratos
, Ratos Wistar
, Receptores de Hormônio Liberador da Corticotropina/genética
, Receptores de Hormônio Liberador da Corticotropina/metabolismo
, Reação em Cadeia da Polimerase Via Transcriptase Reversa
, Substância P/genética
, Transcrição Gênica
, Bexiga Urinária/crescimento & desenvolvimento
, Bexiga Urinária/inervação
, Urotélio/crescimento & desenvolvimento
, Urotélio/inervação
, Peptídeo Intestinal Vasoativo/genética
, Peptídeo Intestinal Vasoativo/metabolismo
RESUMO
Corticotropin-releasing factor (CRF) is a prominent neuropeptide involved in micturition reflexes, and different roles in these reflexes have been suggested. These studies examined the expression of CRF in the urinary bladder and lumbosacral sacral parasympathetic nucleus (SPN) in response to cyclophosphamide (CYP)-induced cystitis (4 h, 48 h, or chronic) in rats. The expression of CRF receptors, CRF(1) and CRF(2), was examined in urinary bladder from control and CYP-treated rats. Urinary bladder and lumbosacral spinal cord were harvested from rats killed by isoflurane (4%) and thoracotomy. CRF protein expression in whole urinary bladders significantly (P < or = 0.01) increased with 48 h or chronic CYP treatment. CRF immunoreactivity (IR) was increased significantly (P < or = 0.01) in the urothelium and SPN after CYP treatment. CRF IR nerve fibers increased in density in the suburothelial plexus and detrusor smooth muscle whole mounts with CYP-induced cystitis. CRF(2) receptor transcript was expressed in the urothelium or detrusor smooth muscle, and CRF(2) receptor expression increased in whole bladder with CYP-treatment, whereas no CRF(1) receptor transcript was expressed in either urothelium or detrusor. Immunohistochemical studies demonstrated CRF(2) IR in urinary bladder nerve fibers and urothelial cells from control animals, whereas no CRF(1) IR was observed. These studies demonstrated changes in the expression of CRF in urinary bladder and SPN region with CYP-induced cystitis and CRF receptor (CRF(2)) expression in nerve fibers and urothelium in control rats. CRF may contribute to urinary bladder overactivity and altered sensory processing with CYP-induced cystitis.