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Integrin alphaIIb promoter-targeted expression of gene products in megakaryocytes derived from retrovirus-transduced human hematopoietic cells. Proc Natl Acad Sci U S A 1999 Aug 17;96(17):9654-9



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Pubmed Central ID




Scopus ID

2-s2.0-0033578285 (requires institutional sign-in at Scopus site)   52 Citations


Megakaryocyte-specific expression of the platelet-adhesion receptor, integrin alphaIIbbeta3, is caused by the presence of regulatory elements of the alphaIIb promoter that direct high-level, selective gene transcription early in megakaryocytopoiesis. To develop methods for targeted expression of transgenes, we transduced human CD34+ peripheral blood cells with a murine leukemia virus (MuLV) vector controlled by the human integrin alphaIIb promoter (nucleotides -889 to +35). A naturally occurring cDNA encoding the Pl(A2) alloantigen form (Pro(33)) of the integrin beta3 subunit was subcloned into this construct (-889Pl(A2)beta3) and transduced into cells that endogenously synthesized Pl(A1)beta3 (Leu(33)) as a marker for detection of provirus-derived beta3. The ability of this vector to target expression of Pl(A2)beta3 to megakaryocytes was first examined in cell lines. Immunoblot analysis with human anti-Pl(A2) alloserum detected synthesis of Pl(A2)beta3 in transduced promegakaryocytic cells; however, Pl(A2)beta3 protein was not detected in transduced epithelial cells. Human hematopoietic CD34+ cells were transduced with -889Pl(A2)beta3 virions and induced to differentiate with megakaryocyte growth and development factor. A hybrid alphaIIbbeta3 complex was formed in progeny megakaryocytes where provirus-derived Pl(A2)beta3 was detected associated with endogenous alphaIIb subunit. Another alphaIIb promoter-driven MuLV vector (-889nlacZ) encoding Escherichia coli beta-galactosidase was used to demonstrate that transgene expression was selectively targeted to the megakaryocyte progeny of transduced CD34+ cells. These studies demonstrate the feasibility of using alphaIIb promoter-driven MuLV vectors for gene transfer of hematopoietic CD34+ cells to target transgene expression in developing megakaryocytes and platelets and indicate potential applications toward human gene therapy for platelet disorders.

Author List

Wilcox DA, Olsen JC, Ishizawa L, Griffith M, White GC 2nd


Gilbert C. White MD Professor in the Medicine department at Medical College of Wisconsin
David A. Wilcox PhD Professor in the Pediatrics department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Antigens, CD34
Cell Line
Gene Expression Regulation
Genetic Therapy
Genetic Vectors
Hematopoietic Stem Cells
Leukemia Virus, Murine
Platelet Glycoprotein GPIIb-IIIa Complex
Promoter Regions, Genetic