Low-density lipoprotein (LDL) receptor activity in human acute myelogenous leukemia cells

Y. K. Ho, R. G. Smith, M. S. Brown, J. L. Goldstein

Research output: Contribution to journalArticle

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Abstract

The rate of receptor-mediated uptake and degradation of 125I-labeled low-density lipoprotein (LDL) was 3-100-fold higher in blood mononuclear cells from 7 patients with acute myelogenous leukemia (AML) as compared with cells from 18 healthy subjects and 21 patients with acute and chronic lymphocytic leukemias, infectious mononucleosis, and nonhematologic malignancies. The rate of cholestrol synthesis from 14C-acetate was also higher (2-30-fold) in the AML cells. The total rate of input of cholesterol (i.e., the sum of LDL-derived and endogenously synthesized cholesterol) in the AML cells was nine fold higher on the average than in the mononuclear cells from normal subjects. In both the normal and AML cells, more than 90% of the cholesterol input was derived from receptor-mediated degradation of LDL and less than 10% from cholesterol synthesized within the cell. Despite the higher input of cholesterol in the AML cells, the cellular content of cholesterol, as measured by cholesterol:protein protein ratio, was 50% lower than in normal mononuclear cells. These data indicate that the turnover of cellular cholesterol is more rapid in AML cells than in normal mononuclear cells. This enhanced turnover might be due to a more rapid rate of utilizaton of cholesterol for cellular growth or to a more rapid efflux of cellular cholesterol. The resultant depletion of cellullar cholesterol elicits both a higher LDL receptor activity and a higher rate of cholesterol synthesis in these leukemic cells.

Original languageEnglish (US)
Pages (from-to)1099-1114
Number of pages16
JournalBlood
Volume52
Issue number6
StatePublished - 1978

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LDL Receptors
Acute Myeloid Leukemia
Human Activities
Cholesterol
LDL Lipoproteins
Degradation
Infectious Mononucleosis
Lipoprotein(a)
B-Cell Chronic Lymphocytic Leukemia
Precursor Cell Lymphoblastic Leukemia-Lymphoma
Blood Cells
Healthy Volunteers
Proteins
Acetates
Blood

ASJC Scopus subject areas

  • Hematology

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Low-density lipoprotein (LDL) receptor activity in human acute myelogenous leukemia cells. / Ho, Y. K.; Smith, R. G.; Brown, M. S.; Goldstein, J. L.

In: Blood, Vol. 52, No. 6, 1978, p. 1099-1114.

Research output: Contribution to journalArticle

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