Cyclooxygenase-1 and -2 in spinally projecting neurons are involved in CRF-induced sympathetic activation.
Corticotropin-releasing factor (CRF) in the brain has been shown to stimulate sympathetic activity, leading to elevations of blood pressure, heart rate and plasma catecholamine levels and neuronal activation of the sympathetic ganglia and adrenal medulla. We previously reported that brain cyclooxygenase (COX), the rate-limiting enzyme in the synthesis of prostanoids, is involved in centrally administered CRF-induced sympathetic activation in rats. Therefore, the present study was designed to reveal the effect of centrally administered CRF (1.5 nmol/animal) on the expression of COX isozymes, COX-1 and COX-2, in spinally projecting neurons until 6h after the administration, using rats microinjected with a monosynaptic retrograde tracer into the intermediolateral cell column of the thoracic spinal cord. Retrogradely labeled neurons were detected in the paraventricular hypothalamic nucleus (PVN), locus coeruleus (LC), raphe pallidus nucleus and rostral ventrolateral medulla. Centrally administered CRF significantly increased the number of spinally projecting PVN neurons expressing COX-1 throughout the experimental period and those expressing COX-2 during only the late phase. CRF also increased the number of spinally projecting LC neurons expressing COX-2 throughout the experimental period. In other regions, the CRF administration had no effect on COXs expression in spinally projecting neurons. These results suggest that COX-1 and COX-2 in the PVN and COX-2 in the LC play roles in the CRF-induced sympathetic regulation in rats.
Yamaguchi
Naoko
N
Department of Pharmacology, Graduate School of Medicine, Kochi University, Nankoku, Kochi 783-8505, Japan. ynaoko@kansei.tsukuba.ac.jp
Okada
Shoshiro
S
D000818:Animals; D017776:Autonomic Pathways / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology; D001921:Brain / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology*; D002395:Catecholamines / Q000097:blood; D003346:Corticotropin-Releasing Hormone / Q000378:metabolism* / Q000494:pharmacology; D051545:Cyclooxygenase 1 / Q000187:drug effects / Q000378:metabolism*; D051546:Cyclooxygenase 2 / Q000187:drug effects / Q000378:metabolism*; D004525:Efferent Pathways / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology; D007276:Injections, Intraventricular; D008125:Locus Coeruleus / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology; D008297:Male; D008565:Membrane Proteins / Q000187:drug effects / Q000378:metabolism*; D056347:Neuroanatomical Tract-Tracing Techniques; D010286:Paraventricular Hypothalamic Nucleus / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology; D011903:Raphe Nuclei / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology; D051381:Rats; D017208:Rats, Wistar; D012154:Reticular Formation / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology; D013266:Stilbamidines; D013564:Sympathetic Nervous System / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology*
C049774:2-hydroxy-4,4'-diamidinostilbene, methanesulfonate salt; D002395:Catecholamines; D008565:Membrane Proteins; D013266:Stilbamidines; D003346:Corticotropin-Releasing Hormone; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; C496513:Ptgs1 protein, rat