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Porcine Niemann Pick-C1 Protein Is Expressed in Steroidogenic Tissues and Modulated by cAMP.

Niemann-Pick C-1 (NPC-1) protein is essential for trafficking of low density lipoprotein-derived cholesterol in mammalian cells. The low density lipoprotein pathway is a major route for supply of cholesterol for steroidogenesis in the adrenals and gonads of many species. We investigated the occurrence and regulation of NPC-1 in porcine tissues, with emphasis on the corpus luteum and on granulosa cells undergoing luteinization in vitro. The porcine open reading frame for NPC-1 predicted a protein of 1278 amino acids (aa). It displayed a domain structure consistent with the human protein, and overall homologies were 89% and 86% with the deduced human and mouse aa sequences, respectively. The mRNA for NPC-1 comprised two transcripts, migrating at 5.0 and 2.2 kb, respectively. Transcripts were detected in a variety of pig tissues and were in highest abundance in steroid-producing organs. NPC-1 mRNA abundance increased with the differentiation of the corpus luteum in vivo and with luteinization of granulosa ce...