The role of high density lipoproteins in rat adrenal cholesterol metabolism and steroidogenesis.

Addition of rat or human high density lipoproteins (HDL) or human low density lipoproteins (LDL) to rat adrenocortical cells in vitro was found to enhance steroid production and increase cell cholesterol content. These effects of HDL were not observed in cultured mouse Y-1 adrenal cells, suggesting that rat adrenal cells possess a specific mechanism for uptake of HDL cholesterol not found in Y-1 cells. The effects of HDL were most marked on cells previously stimulated with adrenocorticotropin (ACTH) and depleted of their endogenous cholesterol stores. Such cells were prepared either by treatment in vivo with 4-aminopyrazolopyrimidine or in vitro with ACTH (10(-7) M) in lipoprotein-poor media. Steroid production by treated cells exhibited a saturable dependence on media HDL concentration. In addition to enhancing ACTH stimulated steroid production, addition of HDL also resulted in a saturable concentration-dependent increase in cell cholesterol content. Both aminoglutethimide and cycloheximide were found to inhibit HDL-enhanced steroid production. Finally, addition of HDL to short term incubations (5 1/2 h) of ACTH-treated cells caused no change in the rate of incorporation of 14C-acetate into cholesterol or corticosterone. These results indicate that rat adrenocortical cells possess a specific, saturable, ACTH-dependent mechanism for uptake of HDL cholesterol. Moreover, cellular uptake of HDL cholesterol exceeded by at least 4-fold the amount of cholesterol associated with HDL apoprotein degraded by the cells, suggesting that utilization of HDL cholesterol does not require endocytosis and lysosomal degradation of the entire HDL particle.

• Publication year

  1980

• Venue

  Journal of Biological Chemistry

• Publication date

  1980-11-25

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0021-9258(19)70388-3PMID 6253490
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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