Title : Central effects of caffeine on renal renin secretion and norepinephrine spillover.

Pub. Date : 1996 Aug

PMID : 8856488






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1 In the second protocol, hydralazine (1 and 10 mg/kg, administered intraperitoneally) significantly enhanced both the renal secretion of renin and the renal spillover of norepinephrine (NE), thus confirming that hydralazine can increase renin release by unloading arterial baroreceptors and increasing sympathetic tone to the kidneys. Hydralazine renin Rattus norvegicus
2 In the second protocol, hydralazine (1 and 10 mg/kg, administered intraperitoneally) significantly enhanced both the renal secretion of renin and the renal spillover of norepinephrine (NE), thus confirming that hydralazine can increase renin release by unloading arterial baroreceptors and increasing sympathetic tone to the kidneys. Hydralazine renin Rattus norvegicus
3 In the second protocol, hydralazine (1 and 10 mg/kg, administered intraperitoneally) significantly enhanced both the renal secretion of renin and the renal spillover of norepinephrine (NE), thus confirming that hydralazine can increase renin release by unloading arterial baroreceptors and increasing sympathetic tone to the kidneys. Hydralazine renin Rattus norvegicus
4 caffeine (10 micrograms/kg/min) on hydralazine-induced (1 and 10 mg/kg, administered intraperitoneally) changes in renal secretion of renin and renal NE spillover were investigated. Hydralazine renin Rattus norvegicus
5 caffeine significantly (p = 0.03) enhanced the increase in renal renin secretion induced by 1 and 10 mg/kg hydralazine (for 1 mg/kg hydralazine delta of 6.4 +/- 46.7 and 142.4 +/- 142.9 renin activity/min/kg body weight in control and caffeine-treated animals, respectively; for 10 mg/kg hydralazine, delta 227.8 +/- 73.9 and 600.8 +/- 168.9 renin activity/min/kg body weight in control and caffeine-treated animals, respectively). Hydralazine renin Rattus norvegicus
6 caffeine significantly (p = 0.03) enhanced the increase in renal renin secretion induced by 1 and 10 mg/kg hydralazine (for 1 mg/kg hydralazine delta of 6.4 +/- 46.7 and 142.4 +/- 142.9 renin activity/min/kg body weight in control and caffeine-treated animals, respectively; for 10 mg/kg hydralazine, delta 227.8 +/- 73.9 and 600.8 +/- 168.9 renin activity/min/kg body weight in control and caffeine-treated animals, respectively). Hydralazine renin Rattus norvegicus
7 caffeine significantly (p = 0.03) enhanced the increase in renal renin secretion induced by 1 and 10 mg/kg hydralazine (for 1 mg/kg hydralazine delta of 6.4 +/- 46.7 and 142.4 +/- 142.9 renin activity/min/kg body weight in control and caffeine-treated animals, respectively; for 10 mg/kg hydralazine, delta 227.8 +/- 73.9 and 600.8 +/- 168.9 renin activity/min/kg body weight in control and caffeine-treated animals, respectively). Hydralazine renin Rattus norvegicus
8 The enhanced renin-secretion response to hydralazine in caffeine-treated rats was accompanied by augmented hydralazine-induced increase in renal NE spillover (p = 0.035). Hydralazine renin Rattus norvegicus
9 The enhanced renin-secretion response to hydralazine in caffeine-treated rats was accompanied by augmented hydralazine-induced increase in renal NE spillover (p = 0.035). Hydralazine renin Rattus norvegicus