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Factor IX ectopically expressed in platelets can be stored in alpha-granules and corrects the phenotype of hemophilia B mice.
Zhang, Guowei; Shi, Qizhen; Fahs, Scot A; Kuether, Erin L; Walsh, Christopher E; Montgomery, Robert R.
Afiliação
  • Zhang G; Department of Pediatrics, Medical College of Wisconsin, Milwaukee, USA.
Blood ; 116(8): 1235-43, 2010 Aug 26.
Article em En | MEDLINE | ID: mdl-20445020
ABSTRACT
We developed 2bF9 transgenic mice in a hemophilia B mouse model with the expression of human factor IX (FIX) under control of the platelet-specific integrin alphaIIb promoter, to determine whether ectopically expressing FIX in megakaryocytes can enable the storage of FIX in platelet alpha-granules and corrects the murine hemophilia B phenotype. FIX was detected in the platelets and plasma of 2bF9 transgenic mice by both antigen and activity assays. Approximately 90% of total FIX in blood was stored in platelets, most of which is releasable on activation of platelets. Immunostaining demonstrated that FIX was expressed in platelets and megakaryocytes and stored in alpha-granules. All 2bF9 transgenic mice survived tail clipping, suggesting that platelet-derived FIX normalizes hemostasis in the hemophilia B mouse model. This protection can be transferred by bone marrow transplantation or platelet transfusion. However, unlike our experience with platelet FVIII, the efficacy of platelet-derived FIX was limited in the presence of anti-FIX inhibitory antibodies. These results demonstrate that releasable FIX can be expressed and stored in platelet alpha-granules and that platelet-derived FIX can correct the bleeding phenotype in hemophilia B mice. Our studies suggest that targeting FIX expression to platelets could be a new gene therapy strategy for hemophilia B.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Plaquetas / Fator IX / Terapia Genética / Hemofilia B / Grânulos Citoplasmáticos Tipo de estudo: Prognostic_studies Limite: Animals / Female / Humans / Male Idioma: En Revista: Blood Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Plaquetas / Fator IX / Terapia Genética / Hemofilia B / Grânulos Citoplasmáticos Tipo de estudo: Prognostic_studies Limite: Animals / Female / Humans / Male Idioma: En Revista: Blood Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Estados Unidos