ATP mediates flow-induced NO production in thick ascending limbs

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چکیده

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ATP mediates flow-induced NO production in thick ascending limbs.

Mechanical stimulation caused by increasing flow induces nucleotide release from many cells. Luminal flow and extracellular ATP stimulate production of nitric oxide (NO) in thick ascending limbs. However, the factors that mediate flow-induced NO production are unknown. We hypothesized that luminal flow stimulates thick ascending limb NO production via ATP. We measured NO in isolated, perfused r...

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NADPH oxidase 4 mediates flow-induced superoxide production in thick ascending limbs.

We previously showed that luminal flow stimulates thick ascending limb (TAL) superoxide (O(2)(-)) production by stretching epithelial cells and increasing NaCl transport, and reported that the major source of flow-induced O(2)(-) is NADPH oxidase (Nox). However, the specific Nox isoform involved is unknown. Of the three isoforms expressed in the kidney-Nox1, Nox2, and Nox4-we hypothesized that ...

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Extracellular ATP stimulates NO production in rat thick ascending limb.

NO produced by NO synthase (NOS) 3 acts as an autacoid to regulate NaCl absorption in the thick ascending limb. ATP induces NO production by NOS 3 in endothelial cells. We hypothesized that extracellular ATP activates NOS in thick ascending limbs through P2 receptors. To test this, we measured intracellular NO production using the NO-selective fluorescent dye DAF-2 in suspensions of rat medulla...

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Nitric oxide reduces flow-induced superoxide production via cGMP-dependent protein kinase in thick ascending limbs.

We have shown that increased luminal flow induces O(2)(-) and nitric oxide (NO) production in thick ascending limbs (TALs). However, the interaction of flow-stimulated NO and O(2)(-) in TALs is unclear. We hypothesized that NO inhibits flow-induced O(2)(-) production in TALs via cGMP-dependent protein kinase (PKG). We measured flow-stimulated O(2)(-) production in rat TALs using dihydroethidium...

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Akt1 mediates purinergic-dependent NOS3 activation in thick ascending limbs.

Extracellular ATP regulates many physiological processes via release of nitric oxide (NO). ATP stimulates NO in thick ascending limbs (TALs), but the signaling cascade involved in the cells of this nephron segment, as well as many other types of cells, is poorly understood. We hypothesized that ATP enhances NO synthase (NOS) activity by stimulating PI3 kinase and Akt. We measured 1) NO in TALs ...

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ژورنال

عنوان ژورنال: American Journal of Physiology-Renal Physiology

سال: 2012

ISSN: 1931-857X,1522-1466

DOI: 10.1152/ajprenal.00504.2011