Abstract
Elevated leukocyte cell numbers (leukocytosis), and monocytes in particular, promote atherosclerosis; however, how they become increased is poorly understood. Mice deficient in the adenosine triphosphate-binding cassette (ABC) transporters ABCA1 and ABCG1, which promote cholesterol efflux from macrophages and suppress atherosclerosis in hypercholesterolemic mice, displayed leukocytosis, a transplantable myeloproliferative disorder, and a dramatic expansion of the stem and progenitor cell population containing Lin(-)Sca-1(+)Kit+ (LSK) in the bone marrow. Transplantation of Abca1(-/-) Abcg1(-/-) bone marrow into apolipoprotein A-1 transgenic mice with elevated levels of high-density lipoprotein (HDL) suppressed the LSK population, reduced leukocytosis, reversed the myeloproliferative disorder, and accelerated atherosclerosis. The findings indicate that ABCA1, ABCG1, and HDL inhibit the proliferation of hematopoietic stem and multipotential progenitor cells and connect expansion of these populations with leukocytosis and accelerated atherosclerosis.
MeSH Terms
ATP Binding Cassette Transporter 1
ATP Binding Cassette Transporter, Subfamily G, Member 1
ATP-Binding Cassette Transporters/genetics,metabolism
Animals
Apolipoprotein A-I/genetics,metabolism
Atherosclerosis/metabolism,physiopathology,therapy
Bone Marrow Transplantation
Cell Proliferation
Cells, Cultured
Cholesterol/metabolism
Hematopoietic Stem Cells/physiology
Hypercholesterolemia/metabolism
Leukocytosis/metabolism,physiopathology,therapy
Lipoproteins/genetics,metabolism
Lipoproteins, HDL/metabolism
Macrophages/metabolism
Mice
Mice, Inbred C57BL
Mice, Inbred DBA
Mice, Transgenic
Multipotent Stem Cells/physiology
Myeloid Progenitor Cells/physiology
Myeloproliferative Disorders/metabolism,physiopathology,therapy
Phenotype
Receptors, Granulocyte-Macrophage Colony-Stimulating Factor/metabolism
Receptors, Interleukin-3/metabolism
Signal Transduction
Chemicals
ABCG1 protein, mouse
ATP Binding Cassette Transporter 1
ATP Binding Cassette Transporter, Subfamily G, Member 1
ATP-Binding Cassette Transporters
Apolipoprotein A-I
Lipoproteins
Lipoproteins, HDL
Receptors, Granulocyte-Macrophage Colony-Stimulating Factor
Receptors, Interleukin-3
Cholesterol
Authors & Affiliations
11 authors, click to expand affiliations / ORCID
Yvan-Charvet Laurent
Division of Molecular Medicine, Department of Medicine, Columbia University, New York, NY 10032, USA.
[email protected]
Pagler Tamara
Gautier Emmanuel L
Avagyan Serine
Siry Read L
Han Seongah
Welch Carrie L
Wang Nan
Randolph Gwendalyn J
Snoeck Hans W
Tall Alan R
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