Hypertension Produced by Reductions in Uterine Perfusion in the Pregnant Rat: Role of Interleukin 6.
From: Department of Physiology and Obstetrics, Center for Excellence in Cardiovascular-Renal Research, University of Mississippi Medical Center, Jackson, Miss. 39216-4505, USA.
Hypertension
- Publish Date: Oct 2006
- ISSN: 1524-4563
- Volume: 48
- Issue: 4
- Pages: 711-6
- Medium: Internet
- Language: English
- Citation (JAMA): Gadonski Giovani, LaMarca B Babbette D, Sullivan Elizabeth, et al. Hypertension Produced by Reductions in Uterine Perfusion in the Pregnant Rat: Role of Interleukin 6.. Hypertension Oct 2006;48:711-6
Abstract
The purpose of this study was to determine the role of interleukin (IL) 6 in mediating the increase in arterial pressure (AP) in response to chronic reductions in uterine perfusion pressure (RUPP) in pregnant rats. AP was higher in RUPP rats (138+/-1 mm Hg) than in normal pregnant (NP) rats (104+/-1 mm Hg). Serum IL-6 levels in the RUPP rats were 104.5+/-28.6 pg/mL as compared with 36.6+/-7.4 pg/mL in NP rats. To determine the long-term effects of a 2- to 3-fold elevation in plasma IL-6 on renal function and AP in pregnant rats, we infused IL-6 for 5 days (2.5 ng/day) in NP rats starting at day 14 of gestation. Five days later, serum IL-6 levels were 55.5+/-6.5 pg/mL in the control NP rats and 157.0+/-36.1 pg/mL in the IL-6-treated NP rats. AP was higher in the IL-6-treated NP rats (115+/-3 mm Hg) as compared with NP controls (101+/-1 mm Hg) at day 19 of gestation. Renal plasma flow and GFR were lower in the IL-6-treated NP rats than in the NP group. IL-6 increased plasma renin activity but did not affect endothelin in IL-6-treated NP rats. In contrast to the NP rats, IL-6 had no effect on AP or renal hemodynamics in virgin rats. In summary, these data indicate that plasma IL-6 is elevated in response to chronic reductions in uterine perfusion in pregnant rats and that a comparable elevation in plasma IL-6 increases AP and reduces renal function in pregnant rats.
Mesh Headings (Keywords): Animals, Aorta, Abdominal, Blood Pressure, Endothelin-1, Female, Hemodynamics, Hypertension, Interleukin-6, Kidney, Pregnancy, Pregnancy Complications, Cardiovascular, Rats, Rats, Sprague-Dawley, Regional Blood Flow, Renal Circulation, Renin, Surgical Instruments, Uterus
Check for Full Text / PubMed Unique Identifier (PMID): 16940225
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