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Selective decrease of mRNAs encoding plasma membrane calcium pump isoforms 2 and 3 in rat kidney.

Abstract：

BACKGROUND:Although the existence of multiple isoforms of plasma membrane calcium ATPase (PMCA) is now well documented, their biological functions are not yet known. In this study, we set out to investigate the potential role of PMCA isoforms, previously identified in renal cortical tissue, in tubular reabsorption of calcium (Ca2+). METHODS:With use of reverse transcription-polymerase chain reaction analysis, we determined levels of mRNAs encoding isoforms of PMCA1 through PMCA4 in renal cortex, liver, and brain of rats with hypercalciuria induced by feeding with a low-phosphate diet (LPD) as compared with Ca2+-retaining rats that were fed a high-phosphate diet (HPD). RESULTS:We observed that in hypercalciuric LPD-fed rats, the mRNAs encoding isoforms PMCA2b and PMCA3(a + c) are significantly lower (Delta approximately-50%) than in HPD-fed hypocalciuric rats, whereas no changes in mRNAs encoding isoforms PMCA1b and PMCA4 were observed, and mRNA encoding calbindin 28 kDa was increased. On the other hand, the content of mRNAs encoding PMCA2b and PMCA3(a + c) in liver and brain, respectively, was not changed. CONCLUSION:These findings are evidence that expression of PMCA isoforms in the kidney can be selectively modulated in response to pathophysiologic stimuli. The association of a decrease in mRNA encoding PMCA2b and PMCA3(a + c) with hypercalciuria suggests that the two PMCA isoforms may be operant in tubular reabsorption of Ca2+ and its regulation.

journal_name

Kidney Int

journal_title

Kidney international

authors

Caride AJ,Chini EN,Penniston JT,Dousa TP

doi

10.1046/j.1523-1755.1999.00736.x

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

1818-25

issue

5

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)46500-7

journal_volume

56

pub_type

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