A defective response to Hedgehog signaling in disorders of cholesterol biosynthesis.

Cooper MK, Wassif CA, Krakowiak PA, Taipale J, Gong R, Kelley RI, Porter FD, Beachy PA
Nat Genet. 2003 33 (4): 508-13

PMID: 12652302 · DOI:10.1038/ng1134

Smith-Lemli-Opitz syndrome (SLOS), desmosterolosis and lathosterolosis are human syndromes caused by defects in the final stages of cholesterol biosynthesis. Many of the developmental malformations in these syndromes occur in tissues and structures whose embryonic patterning depends on signaling by the Hedgehog (Hh) family of secreted proteins. Here we report that response to the Hh signal is compromised in mutant cells from mouse models of SLOS and lathosterolosis and in normal cells pharmacologically depleted of sterols. We show that decreasing levels of cellular sterols correlate with diminishing responsiveness to the Hh signal. This diminished response occurs at sterol levels sufficient for normal autoprocessing of Hh protein, which requires cholesterol as cofactor and covalent adduct. We further find that sterol depletion affects the activity of Smoothened (Smo), an essential component of the Hh signal transduction apparatus.

MeSH Terms (22)

3T3 Cells Animals Anticholesteremic Agents Cells, Cultured Chick Embryo Cholesterol Cyclodextrins Dose-Response Relationship, Drug Hedgehog Proteins Humans Lovastatin Mice Models, Biological Precipitin Tests Receptors, Cell Surface Receptors, G-Protein-Coupled Signal Transduction Smith-Lemli-Opitz Syndrome Smoothened Receptor Time Factors Trans-Activators Transfection

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