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(Hypertension. 1997;29:1291-1295.)
© 1997 American Heart Association, Inc.

Articles

Sympathoexcitatory Effect of Hypothalamic/ Hypophysary Inhibitory Factor in Rats

Bing S. Huang; Jose M. Sancho; Rafael Garcia-Robles; ; Frans H. H. Leenen

From the University of Ottawa (Ontario, Canada) Heart Institute (B.S.H., F.H.H.L.), and Department of Endocrinology, Hospital Ramon Y Cajia, Madrid, Spain (J.M.S., R.G.-R.).

Correspondence to Frans H.H. Leenen, MD, PhD, FRCPC, Hypertension Unit, H360, Division of Cardiology, University of Ottawa Heart Institute, 1053 Carling Ave, Ottawa, Ontario, K1Y 4E9 Canada. E-mail fleenen{at}ohi-net.heartinst.on.ca

Abstract We recorded changes in arterial blood pressure, heart rate, and renal sympathetic nerve activity in response to intracerebroventricular injection of bovine hypothalamic/hypophysary inhibitory factor and ouabain in conscious Wistar rats. Ouabain at 0.3 to 0.6 µg caused dose-related increases in blood pressure, heart rate, and nerve activity (peak increases: 19±2 mm Hg, 42±4 beats per minute, and 48±4%, respectively; P<.05 versus basal). These responses were all blocked by central antibody Fab fragments, which bind ouabain and related steroids with high affinity. The inhibitory factor significantly increased blood pressure but decreased heart rate and nerve activity. Dose-dependent increases in blood pressure as well as heart rate and nerve activity were observed when the inhibitory factor was injected after intravenous injection of the vasopressin antagonist D-(CH₂)₅Tyr-(Me)AVP. Central Fab fragments, however, did not affect these responses. Both ouabain and the inhibitory factor inhibited Na⁺,K⁺-ATPase activity in vitro. Fab fragments blocked this inhibition by ouabain but not by the inhibitory factor. These data indicate that the ouabainlike sympathoexcitatory effect of this factor is masked probably by a potent central effect on vasopressin release. In contrast to rat brain "ouabain," this factor does not exhibit a high affinity for the Fab fragments, supporting the previous finding that this compound is structurally a nonouabain Na⁺,K⁺-ATPase inhibitor.

Key Words: Na⁺,K⁺-exchanging ATPase • ouabain • hypothalamo-hypophyseal system • sympathetic nerve activity • immunoglobulins, Fab

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