| Myogenic responses of mouse isolated perfused renal afferent arterioles: effects of salt intake and reduced renal mass. | |
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MedLine Citation:
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PMID: 20194294 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Because defects in renal autoregulation may contribute to renal barotrauma in chronic kidney disease, we tested the hypothesis that the myogenic response is diminished by reduced renal mass. Kidneys from 5/6 nephrectomized mice had only a minor increase in the glomerular sclerosis index. The telemetric mean arterial pressure (108+/-10 mm Hg) was unaffected after 3 months of high-salt intake (6% salt in chow) or reduced renal mass. Afferent arterioles from 5/6 nephrectomized mice and sham-operated controls were perfused ex vivo during step changes in pressure from 40 to 134 mm Hg. Afferent arterioles developed a constriction and a linear increase in active wall tension above a perfusion pressure of 36+/-6 mm Hg, without a plateau. The slope of active wall tension versus perfusion pressure defined the myogenic response, which was similar in sham mice fed normal or high-salt diets for 3 months (2.90+/-0.22 versus 3.22+/-0.40 dynes x cm(-1)/mm Hg; P value not significant). The myogenic response was unaffected after 3 days of reduced renal mass on either salt diet (3.39+/-0.61 versus 4.04+/-0.47 dynes x cm(-1)/mm Hg) but was reduced (P<0.05) in afferent arterioles from reduced renal mass groups fed normal and high salt at 3 months (2.10+/-0.28 and 1.35+/-0.21 dynes x cm(-1)/mm Hg). In conclusion, mouse renal afferent arterioles develop a linear increase in myogenic tone around the range of ambient perfusion pressures. This myogenic response is impaired substantially in the mouse model of prolonged reduced renal mass, especially during high salt intake. |
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Authors:
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En Yin Lai; Maristela L Onozato; Glenn Solis; Shakil Aslam; William J Welch; Christopher S Wilcox |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2010-03-01 |
Journal Detail:
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Title: Hypertension Volume: 55 ISSN: 1524-4563 ISO Abbreviation: Hypertension Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-03-18 Completed Date: 2010-04-09 Revised Date: 2011-07-27 |
Medline Journal Info:
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Nlm Unique ID: 7906255 Medline TA: Hypertension Country: United States |
Other Details:
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Languages: eng Pagination: 983-9 Citation Subset: IM |
Affiliation:
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Division of Nephrology and Hypertension, Georgetown University Medical Center, Washington, DC 20007, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Albuminuria Analysis of Variance Animals Arterioles / drug effects, physiology Blood Pressure / physiology Creatinine / blood Homeostasis / physiology Kidney / blood supply*, drug effects, pathology*, physiology Male Mice Muscle, Smooth, Vascular Organ Size Random Allocation Sodium Chloride, Dietary / pharmacology Telemetry Vasoconstriction / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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DK-036079/DK/NIDDK NIH HHS; DK-049870/DK/NIDDK NIH HHS; HL-68686/HL/NHLBI NIH HHS; P01 HL068686-08/HL/NHLBI NIH HHS; R01 DK049870-15/DK/NIDDK NIH HHS; R37 DK036079-23/DK/NIDDK NIH HHS; R37 DK036079-25/DK/NIDDK NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Sodium Chloride, Dietary; 60-27-5/Creatinine |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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