HMG CoA reductase and LDL receptor genes are regulated differently by 15-ketosterols in Hep G2 cells.

Abstract:

:The ability of two 15-ketosubstituted sterols, 5alpha-cholest-8(14)-en-3beta-ol-15-one and 3beta-(2-hydroxyethoxy)-5alpha-cholest-8(14)-en-15-one, to alter the mRNA levels of 3-hydroxy-3-methylglutaryl-CoA reductase, low density lipoprotein receptor, and oxysterol binding protein was studied and compared with the effects of 25-hydroxycholesterol in Hep G2 cells. All three oxysterols decreased the level of HMG CoA reductase mRNA at concentrations of 10-30 microM, although 25-hydroxycholesterol was effective at concentrations of 1-3 microM. 25-Hydroxycholesterol lowered the level of LDL receptor mRNA more efficiently after 8 hours than after 24 hours of incubation, whereas 15-ketosterols did not decrease the mRNA level of the LDL receptor. The transcriptions of HMG CoA reductase and LDL receptor genes are therefore independently regulated by 15-ketosterols in Hep G2 cells. In addition, the level of the oxysterol binding protein mRNA is not affected by oxysterols in Hep G2 cells.

authors

Kisseleva AF,Goryunova LE,Planells R,Lafont H,Alquier C

doi

10.1006/bbrc.1999.0844

subject

Has Abstract

pub_date

1999-06-16 00:00:00

pages

688-94

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(99)90844-6

journal_volume

259

pub_type

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