Fredric Kraemer

Publication Details

  • The LDL receptor is not necessary for acute adrenal steroidogenesis in mouse adrenocortical cells AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM Kraemer, F. B., Shen, W., Patel, S., Osuga, J., Ishibashi, S., Azhar, S. 2007; 292 (2): E408-E412

    Abstract:

    Steroid hormones are synthesized using cholesterol as precursor. To determine the functional importance of the low density lipoprotein (LDL) receptor and hormone-sensitive lipase (HSL) in adrenal steroidogenesis, adrenal cells were isolated from control, HSL(-/-), LDLR(-/-), and double LDLR/HSL(-/-) mice. The endocytic and selective uptake of apolipoprotein E-free human high density lipoprotein (HDL)-derived cholesteryl esters did not differ among the mice, with selective uptake accounting for >97% of uptake. In contrast, endocytic uptake of either human LDL- or rat HDL-derived cholesteryl esters was reduced 80-85% in LDLR(-/-) and double-LDLR/HSL(-/-) mice. There were no differences in the selective uptake of either human LDL- or rat HDL-derived cholesteryl esters among the mice. Maximum corticosterone production induced by ACTH or dibutyryl cyclic AMP and lipoproteins was not altered in LDLR(-/-) mice but was reduced 80-90% in HSL(-/-) mice. Maximum corticosterone production was identical in HSL(-/-) and double-LDLR/HSL(-/-) mice. These findings suggest that, although the LDL receptor is responsible for endocytic delivery of cholesteryl esters from LDL and rat HDL to mouse adrenal cells, it appears to play a negligible role in the delivery of cholesterol for acute adrenal steroidogenesis in the mouse. In contrast, HSL occupies a vital role in adrenal steroidogenesis because of its link to utilization of selectively delivered cholesteryl esters from lipoproteins.

    View details for DOI 10.1152/ajpendo.00428.2006

    View details for Web of Science ID 000243997100005

    View details for PubMedID 16985254

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