Faculty Collaboration Database

Megakaryocyte-targeted synthesis of the integrin beta(3)-subunit results in the phenotypic correction of Glanzmann thrombasthenia. Blood 2000 Jun 15;95(12):3645-51

Date

06/14/2000

Pubmed ID

10845892

Scopus ID

2-s2.0-0034660309 (requires institutional sign-in at Scopus site)   52 Citations

Abstract

Glanzmann thrombasthenia is an inherited bleeding disorder characterized by qualitative or quantitative defects of the platelet-specific integrin, alphaIIbbeta(3). As a result, alphaIIbbeta(3) cannot be activated and cannot bind to fibrinogen, leading to a loss of platelet aggregation. Thrombasthenia is clinically characterized by mucocutaneous hemorrhage with episodes of intracranial and gastrointestinal bleeding. To develop methods for gene therapy of Glanzmann thrombasthenia, a murine leukemia virus (MuLV)-derived vector, -889Pl(A2)beta(3), was transduced into peripheral blood CD34(+) cells from 2 patients with thrombasthenia with defects in the beta(3) gene. The human alphaIIb promoter was used in this vector to drive megakaryocyte-targeted expression of the wild-type beta(3) subunit. Proviral DNA and alphaIIbbeta(3) biosynthesis were detected after in vitro differentiation of transduced thrombasthenic CD34(+) cells with megakaryocyte growth and development factor. Flow cytometric analysis of transduced patient samples indicated that 19% of megakaryocyte progeny expressed alphaIIbbeta(3) on the surface at 34% of normal receptor levels. Treatment of transduced megakaryocytes with a combination of agonists including epinephrine and the thrombin receptor-activating peptide induced the alphaIIbbeta(3) complex to form an activated conformation capable of binding fibrinogen as measured by PAC-1 antibody binding. Transduced cells retracted a fibrin clot in vitro similar to megakaryocytes derived from a normal nonthrombasthenic individual. These results demonstrate ex vivo phenotypic correction of Glanzmann thrombasthenia and support the potential use of hematopoietic CD34(+) cells as targets for alphaIIb promoter-driven MuLV vectors for gene therapy of platelet disorders. (Blood. 2000;95:3645-3651)

Author List

Wilcox DA, Olsen JC, Ishizawa L, Bray PF, French DL, Steeber DA, Bell WR, Griffith M, White GC 2nd

Authors

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, CD
Antigens, CD34
Cell Line
Cells, Cultured
Fibrin
Flow Cytometry
Genetic Therapy
Humans
Integrin beta3
Integrins
Megakaryocytes
Phenotype
Platelet Membrane Glycoproteins
Polymerase Chain Reaction
Recombinant Proteins
Signal Transduction
Thrombasthenia
Transfection