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. 1993 Jun;91(6):2399–2407. doi: 10.1172/JCI116473

Endogenous prostaglandin E2 mediates inhibition of rat thick ascending limb Cl reabsorption in chronic hypercalcemia.

L N Peterson 1, A J McKay 1, J S Borzecki 1
PMCID: PMC443298  PMID: 8390479

Abstract

The hypothesis that endogenous PGE2 mediates defective thick ascending limb (TAL) Cl reabsorption (percent delivered load: FRCl%) in rats with vitamin D-induced chronic hypercalcemia (HC) was tested by measuring FRCl% in loop segments microperfused in vivo in HC and control rats treated acutely with indomethacin (Indo) or its vehicle, and obtaining the corresponding outer medullary [PGE2]. Microperfusion conditions were developed in which FRCl% was exclusively furosemide sensitive. To determine the cellular mechanism, tubules were perfused acutely with forskolin (FSK), cAMP, or the protein kinase C inhibitor staurosporine (SSP). Outer medullary [PGE2] in HC rats was 9 to 10 times greater than control and could be normalized by Indo. FRCl% was 20% lower in HC rats infused with vehicle, and Indo, FSK, and cAMP returned FRCl% to normal despite sustained HC. Indo or FSK had no effect on FRCl% in control rats and Indo did not prevent inhibition of FRCl% by luminal PGE2 (1 microM). Luminal SSP (10(-7), 10(-8) M) in HC did not return FRCl% to control values. We conclude that impaired TAL FRCl% in HC occurs at a pre-cAMP site and is due to endogenous PGE2 and not to HC.

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Selected References

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