ArticleMolecular and cellular biochemistry2008
Oxidative stress plays a permissive role in alpha2-adrenoceptor-mediated events in immortalized SHR proximal tubular epithelial cells.
Article in Molecular and cellular biochemistry, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 13 citations in OpenAlex.
- Effects of reactive oxygen species on renal tubular transport.American journal of physiology. Renal physiology · 2019Review
- Thrombospondin-1 activation of signal-regulatory protein-α stimulates reactive oxygen species production and promotes renal ischemia reperfusion injury.Journal of the American Society of Nephrology : JASN · 2014Article
- Unique role of NADPH oxidase 5 in oxidative stress in human renal proximal tubule cells.Redox biology · 2014Article
- Angiotensin II stimulates superoxide production in the thick ascending limb by activating NOX4.American journal of physiology. Cell physiology · 2012Article
- Role of reactive oxygen species in hyperadrenergic hypertension: biochemical, physiological, and pharmacological evidence from targeted ablation of the chromogranin a (Chga) gene.Circulation. Cardiovascular genetics · 2010Article
- Reactive oxygen species and dopamine receptor function in essential hypertension.Clinical and experimental hypertension (New York, N.Y. : 1993) · 2009Review
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Authors and funding
4 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The present study evaluated the role of oxidative stress on alpha(2)-adrenoceptor-mediated events (Cl(-)/HCO (3) (-) exchanger activity and cAMP accumulation) in immortalized renal proximal tubular epithelial (PTE) cells from the spontaneously hypertensive rat (SHR) and its normotensive control (Wistar Kyoto rat; WKY). The exposure of cells to alpha(2)-adrenoceptor agonist UK 14,304 reduced Cl(-)/HCO (3) (-) exchanger activity with EC(50) of 2.0 microM in SHR PTE cells, whereas in WKY PTE cells no effects were observed. These effects were abolished by yohimbine, an alpha(2)-adrenoceptor antagonist, but insensitive to prazosin. Both forskolin and dibutyryl cAMP stimulated Cl(-)/HCO (3) (-) exchanger activity in WKY and SHR PTE cells, which was prevented by the PKA inhibitor H-89. Forskolin increased cAMP levels in both WKY and SHR PTE cells to a similar extent, but UK 14,304 significantly reduced the forskolin-induced increase in cAMP levels in only SHR PTE cells. Immunoblotting showed that expression of alpha(2B)-adrenoceptors was 12-times greater in SHR PTE cells than in WKY PTE cells. SHR PTE cells have increased levels of H(2)O(2) and overexpress type 2 NADPH oxidase (NOX2) and p22(phox) compared with WKY cells. In SHR PTE cells, the NADPH oxidase inhibitor apocynin reduced their increased ability to generate H(2)O(2) and abolished the inhibitory effects of UK 14,304 on Cl(-)/HCO (3) (-) exchanger activity and cAMP accumulation. It is concluded that differences between WKY and SHR PTE cells on their sensitivity to alpha(2)-adrenoceptor agonists correlate with the expression of alpha(2B)-adrenoceptors. The increased generation of H(2)O(2) amplifies the response downstream to alpha(2)-adrenoceptor activation in SHR PTE cells.
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