Deficiency of ATP-binding cassette transporter B6 in megakaryocyte progenitors accelerates atherosclerosis in mice

Andrew James Murphy, Vincent Sarrazy, Nan Wang, Nora Bijl, Sandra Abramowicz, Marit Westerterp, Carrie L Welch, John D Schuetz, Laurent Yvan-Charvet

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    23 Citations (Scopus)

    Abstract

    Objective-The ATP-binding cassette (ABC) transporter B6 (ABCB6) is highly expressed in megakaryocyte progenitors, but its role in platelet production and disease has not been elucidated. Approach and results-Among various ABC transporters, ABCB6 was highly expressed in megakaryocyte progenitors, exhibiting the same pattern of expression of genes involved in heme synthesis pathway. Transplantation of Abcb6 deficient (Abcb6-/-) bone marrow into low density lipoprotein receptor deficient recipient mice resulted in expansion and proliferation of megakaryocyte progenitors, attributable to increased reactive oxygen species production in response to porphyrin loading. The enhanced megakaryopoiesis in Abcb6-/- bone marrow-transplanted mice was further illustrated by increased platelet counts, mean platelet volume, and platelet activity. Platelets from Abcb6-/- bone marrow-transplanted mice had higher levels of chemokine (C-C motif) ligand 5, which was associated with increased plasma chemokine (C-C motif) ligand 5 levels. There were also increased platelet-leukocyte aggregates, which resulted in leukocyte activation. Abcb6-/- bone marrow-transplanted mice had accelerated atherosclerosis which was associated with deposition of the chemotactic agent, chemokine (C-C motif) ligand 5 in atherosclerotic plaques, resulting in increased macrophage accumulation. Conclusions-Our findings identify a new role of ABCB6 in preventing atherosclerosis development by dampening platelet production, reactivity, and chemokine (C-C motif) ligand 5 deposition in atherosclerotic lesions. ? 2014 American Heart Association, Inc.
    Original languageEnglish
    Pages (from-to)751 - 758
    Number of pages8
    JournalArteriosclerosis, Thrombosis and Vascular Biology
    Volume34
    Issue number4
    DOIs
    Publication statusPublished - 2014

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