Influence of renal ischaemia-reperfusion injury on renal neutrophil gelatinase-associated lipocalin receptor (24p3R) in rats.
The neutrophil gelatinase-associated lipocalin (NGAL) receptor (24p3R) is expressed in distal nephron and contributes to the endocytosis of NGAL in urine. This study was undertaken to evaluate an influence of renal ischaemia-reperfusion injury on 24p3R. Unilateral renal pedicle was clamped for 0, 10, 20, 30, or 45 minutes in male Wistar rats. Urine was collected for 24 hours after reperfusion, and ischaemic kidney and blood sample were obtained. Apparent histological injury in the ischaemic kidney was detected in the 30 and 45 minutes-treated groups. Urinary NGAL excretion elevated in rats with renal ischaemia for more than 20 minutes, while serum creatinine increased in rats for more than 30 minutes of ischaemia. Renal protein expression of NGAL did not significantly change. Renal mRNA expressions of megalin and cubilin, which are expressed at renal proximal tubules and uptake NGAL, decreased in animals with renal ischaemia for more than 20 minutes. Renal protein expression of 24p3R, which is expressed at renal distal tubules and uptake NGAL, decreased in rats with renal ischaemia for 45 min. This study showed for the first time that renal 24p3R decreased in response to renal ischaemia. As relatively longer renal ischaemia (45 minutes) decreased renal 24p3R protein and increased urinary NGAL excretion, the down-regulation of 24p3R protein might contribute to the elevated urinary excretion of NGAL in rats with unilateral ischaemia-reperfusion injury.
['Arakawa|Yusuke|Y|', 'Ushijima|Kentaro|K|', 'Tsuchiya|Hiroyoshi|H|', 'Morishige|Jun-Ichi|JI|', 'Mii|Akiko|A|', 'Ando|Hitoshi|H|', 'Tsuruoka|Shu-Ichi|SI|', 'Fujimura|Akio|A|0000-0002-5160-5777']
D058186:Acute Kidney Injury D000818:Animals D015415:Biomarkers D002478:Cells, Cultured D005786:Gene Expression Regulation D007668:Kidney D007687:Kidney Tubules, Proximal D000071068:Lipocalin-2 D008297:Male D009399:Nephrons D051381:Rats D017208:Rats, Wistar D011956:Receptors, Cell Surface D015427:Reperfusion Injury
ischaemia-reperfusion neutrophil gelatinase-associated lipocalin 24p3R megalin kidney injury