A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section.

A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section. Research Abstract Details 

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A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section. Abstract Text:

Wensheng Zhang, Edwards,

We developed a two-dimensional model of NO transport in a cross section of the inner stripe (IS) of the rat outer medulla to determine whether tubular and vascular generation of NO result in significant NO concentration (C(NO)) differences between the periphery and the center of vascular bundles and thereby affect medullary blood flow distribution. Following the approach of Layton and Layton (Layton AT, Layton HE. Am J Physiol Renal Physiol 289: F1346-F1366, 2006), the structural heterogeneity of the IS was incorporated in a representative unit consisting of four concentric regions centered on a vascular bundle. Our model suggests that the diffusion distance of NO in the interstitium is limited to a few micrometers. We predict that, under basal conditions, epithelial NO generation raises the average C(NO) in pericytes surrounding peripheral descending vasa recta (DVR) by a few nanomoles relative to that in pericytes surrounding central DVR. The short descending limbs and long ascending limbs are found to exert the greatest effect on C(NO) in pericytes; long descending limbs and short ascending limbs only have a moderate effect, whereas outer medullary collecting ducts, which are situated far from the vascular bundle center, do not affect pericyte C(NO). Our results suggest that selective stimulation of epithelial NO production should significantly raise the periphery-to-center DVR diameter ratio, thereby increasing the outer medulla-to-inner medulla blood flow ratio. However, concomitant increases in epithelial superoxide (O(2)(-)) production would counteract this effect. This model confirms the importance of NO and O(2)(-) interactions in mediating tubulovascular cross talk.

A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section. Publishing Authors By Initials

W Zhang,A Edwards,

For similar animals: chordata: vertebrates: mammals: rodentia: muridae: murinae: rats research abstracts see: animals: chordata: vertebrates: mammals: rodentia: muridae: murinae: rats research

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A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: American journal of physiology. Renal physiology

VOLUME: 292

Page Numbers: F711-22

Journal Abbreviation: Am. J. Physiol. Renal Physiol.

ISSN: 0363-6127

DAY: 10

MONTH: 10

YEAR: 2006

A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 100901990

A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section. Keywords Mesh Terms:

KEYWORDS: Rats

MESH TERMS: physiology

Chemical & Substance for Abstract: A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section. Information

Substance Name: Nitric Oxide

Registry Number: 10102-43-9

Grant and Affiliation Information for A model of nitric oxide tubulovascular cross talk in a renal outer medullary cross section.

AFFILIATION: Dept. of Chemical and Biological Engineering, Tufts University, Medford, MA 02155, USA.

Country: United States

AGENCY: United States NIDDK

GRANT: DK-53775

ACRONYM: DK

MEDLINETA: Am J Physiol Renal Physiol

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