| Role of nitric oxide in the natriuretic and diuretic responses in pregnant rats. | |
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MedLine Citation:
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PMID: 12876067 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Normal pregnancy is characterized by sodium conservation and increase in plasma volume, yet the natriuretic response to acute saline volume expansion (VE) is intact in pregnant rats. Nitric oxide (NO) has been suggested to play a role in renal and cardiovascular adaptations to normal pregnancy. The objective of this study was to determine the role of NO in the natriuretic and diuretic responses to VE during pregnancy. Infusion of NG-monomethyl-l-arginine (l-NMMA) was used to inhibit NO synthesis. Nine groups of Sprague-Dawley (SD) rats were studied: nonpregnant (NP-VE, n = 7), midterm pregnant (MP-VE, n = 8), and late-term pregnant (LP-VE, n = 7) SD groups that underwent VE alone after a control period; NP-l-NMMA (n = 7), MP-l-NMMA (n = 8), and LP-l-NMMA (n = 7) SD groups that were infused with l-NMMA after a control period; and another three groups of SD rats (NP-VE-l-NMMA, n = 8; MP-VE-l-NMMA, n = 7; and LP-VE-l-NMMA, n = 12) that underwent simultaneous VE and l-NMMA infusion after a control period. The change in fractional excretion of sodium was 7.22 +/- 1.03% for NPVE, 9.89 +/- 1.85% for NP-l-NMMA, and 17.66 +/- 1.85% for NP-VE-l-NMMA (P < 0.05 vs. NP-VE and NP-l-NMMA); 6.61 +/- 1.07% for MP-VE, 7.99 +/- 1.92% for MP-l-NMMA, and 10.24 +/- 1.91% for MP-VE-l-NMMA [not significant (NS) vs. MP-VE and MP-l-NMMA]; 8.20 +/- 1.92% for LP-VE, 8.09 +/- 0.70% for LP-l-NMMA, and 7.57 +/- 1.11% for LP-VE-l-NMMA (both NS vs. LP-VE and LP-l-NMMA). The increase in renal interstitial hydrostatic pressure was significantly greater in all NP compared with pregnant groups with similar experimental intervention (i.e., VE, l-NMMA, or VE-l-NMMA). In conclusion, the natriuretic and diuretic responses to VE and l-NMMA infusion were additive in NP but not in pregnant rats, indicating a possible lower ability of pregnant rats to respond to combined significant natriuretic and diuretic stimuli. |
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Authors:
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Ali A Khraibi; Tianzheng Yu; Daiyi Tang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. Date: 2003-07-22 |
Journal Detail:
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Title: American journal of physiology. Renal physiology Volume: 285 ISSN: 1931-857X ISO Abbreviation: Am. J. Physiol. Renal Physiol. Publication Date: 2003 Nov |
Date Detail:
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Created Date: 2003-10-08 Completed Date: 2003-12-02 Revised Date: 2011-04-28 |
Medline Journal Info:
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Nlm Unique ID: 100901990 Medline TA: Am J Physiol Renal Physiol Country: United States |
Other Details:
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Languages: eng Pagination: F938-44 Citation Subset: IM |
Affiliation:
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Department of Physiological Sciences, Eastern Virginia Medical School, 700 Olney Rd., Norfolk, VA 23507-1696, USA. khraibaa@evms.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Pressure / drug effects Diuresis / physiology* Drug Combinations Enzyme Inhibitors / administration & dosage, pharmacology Female Hydrostatic Pressure Infusions, Intravenous Kidney / physiology Natriuresis / physiology* Nitric Oxide / antagonists & inhibitors, physiology* Pregnancy Pregnancy, Animal / physiology* Rats Rats, Sprague-Dawley Sodium Chloride / administration & dosage, pharmacology omega-N-Methylarginine / administration & dosage, pharmacology |
| Grant Support | |
ID/Acronym/Agency:
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HD-38240/HD/NICHD NIH HHS; HL-52765/HL/NHLBI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Drug Combinations; 0/Enzyme Inhibitors; 10102-43-9/Nitric Oxide; 17035-90-4/omega-N-Methylarginine; 7647-14-5/Sodium Chloride |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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