Effects of intracerebroventricular administration of prostaglandins I2, E2, F2 alpha and indomethacin on blood pressure in the rat

K KondoE Kato


The effects of intraventricularly administered prostaglandins I2 (PGI2), E2 (PGE2), F2alpha (PGF2 alpha) and indomethacin on systemic blood pressure were investigated in conscious rats. PGI2 (1.25--10 micrograms/kg) decreased blood pressure in a dose-related manner, whereas PGE2 (100--1000 mg/kg) dose-dependently increased blood pressure. Both PGF2 alpha (0.31--20 micrograms/kg) and indomethacin (0.625--40 micrograms/kg) had no effects on blood pressure. These results indicate that intraventricular injection of PGI2 or PGE2 can induce significant changes in blood pressure, while endogenous prostaglandins synthesized in the brain seem to play a minor role in direct regulation of systemic blood pressure in the rat.


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