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Influence of recombinant human relaxin on renal hemodynamics in healthy volunteers

Lookup NU author(s): Dr Marie Smith, Emeritus Professor John Davison


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Maternal renal hemodynamic adaptation to human pregnancy is one of the most dramatic of all physiologic changes, but the factors that are responsible have remained elusive. In rat pregnancy, there are comparable renal hemodynamic changes, and in this species there is comprehensive evidence that the ovarian hormone relaxin (RLX) is responsible. This study investigated the renal effects of recombinant human RLX (rhRLX) in humans. Eleven volunteers (six male, five female) received intravenous infusions of rhRLX over 5 h at an infusion rate that was chosen to sustain serum concentrations that are comparable to early pregnancy. The renal clearances of inulin and para-aminohippurate were used to measure GFR and renal plasma flow, respectively. Irrespective of gender, renal plasma flow was increased by 47% compared with baseline levels (P < 0.0001), but no significant change was observed in GFR. There were no side effects or adverse reactions of rhRLX given as an intravenous infusion, and the data suggest that RLX indeed may be one of the elusive renal vasodilatory factors in human pregnancy. Further work is necessary to elucidate the complimentary factors that permit the concomitant increase in GFR during pregnancy. Copyright © 2006 by the American Society of Nephrology.

Publication metadata

Author(s): Smith MC, Danielson LA, Conrad KP, Davison JM

Publication type: Article

Publication status: Published

Journal: Journal of the American Society of Nephrology

Year: 2006

Volume: 17

Issue: 11

Pages: 3192-3197

ISSN (print): 1046-6673

ISSN (electronic): 1533-3450

Publisher: American Society of Nephrology


DOI: 10.1681/ASN.2005090950

PubMed id: 17035617


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