Fredric Kraemer

Publication Details

  • HSL-knockout mouse testis exhibits class B scavenger receptor upregulation and disrupted lipid raft microdomains JOURNAL OF LIPID RESEARCH Emilia Casado, M., Huerta, L., Isabel Ortiz, A., Perez-Crespo, M., Gutierrez-Adan, A., Kraemer, F. B., Angel Lasuncion, M., Busto, R., Martin-Hidalgo, A. 2012; 53 (12): 2586-2597

    Abstract:

    There is a tight relationship between fertility and changes in cholesterol metabolism during spermatogenesis. In the testis, class B scavenger receptors (SR-B) SR-BI, SR-BII, and LIMP II mediate the selective uptake of cholesterol esters from HDL, which are hydrolyzed to unesterified cholesterol by hormone-sensitive lipase (HSL). HSL is critical because HSL knockout (KO) male mice are sterile. The aim of the present work was to determine the effects of the lack of HSL in testis on the expression of SR-B, lipid raft composition, and related cell signaling pathways. HSL-KO mouse testis presented altered spermatogenesis associated with decreased sperm counts, sperm motility, and infertility. In wild-type (WT) testis, HSL is expressed in elongated spermatids; SR-BI, in Leydig cells and spermatids; SR-BII, in spermatocytes and spermatids but not in Leydig cells; and LIMP II, in Sertoli and Leydig cells. HSL knockout male mice have increased expression of class B scavenger receptors, disrupted caveolin-1 localization in lipid raft plasma membrane microdomains, and activated phospho-ERK, phospho-AKT, and phospho-SRC in the testis, suggesting that class B scavenger receptors are involved in cholesterol ester uptake for steroidogenesis and spermatogenesis in the testis.

    View details for DOI 10.1194/jlr.M028076

    View details for Web of Science ID 000310905000008

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