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Thyroid hormones stimulate Na+-Pi transport activity in rat renal brush-border membranes: role of membrane lipid composition and fluidity.

Abstract：

:Antecedent studies have suggested that lipid composition and fluidity of cellular membranes of various organs are altered in response to thyroid hormone status. To date, the effects of thyroid hormone status on these parameters have not been examined in rat renal apical membrane in regard to sodium-dependent phosphate transport. In the present study, we determined the potential role of alterations in cortical brush-border membrane lipid composition and fluidity in modulation of Na+-Pi transport activity in response to thyroid hormone status. Thyroid hormone status influences the fractional excretion of Pi, which is associated with alteration in renal brush-border membrane phosphate transport. The increment in Na+-Pi transport in renal BBMV isolated from Hyper-T rats is manifested as an increase in the maximal velocity (Vmax) of Na+-Pi transport. Further, the cholesterol content was significantly increased in renal BBM of Hypo-T rats and decreased in Hyper-T rats as compared to the Eu-T rats. The molar ratio of cholesterol/phospholipids was also higher in renal BBM from hypo-T rats. Subsequently, fluorescence anisotropy of diphenyl hexatriene (rDPH) and microviscosity were significantly decreased in the renal BBM of the Hyper-T rats and increased in the Hypo-T rats as compared to Eu-T rats. The result of this study, therefore, suggest that alteration in renal BBM cholesterol, cholesterol/phospholipid molar ratio, and membrane fluidity play an important role in the modulation of renal BBM Na+-Pi transport in response to thyroid hormone status of animals.

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Prasad R,Kumar V

doi

10.1007/s11010-005-3545-7

keywords:

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

75-82

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

268

pub_type

杂志文章

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