Korean J Hematol 2003; 38(3):
Published online September 30, 2003
© The Korean Society of Hematology
이미자, 김승택
충북대학교 의과대학 내과학교실, 의학연구소
Background : Erythropoietin (EPO) is a 30.4kDa glycoprotein that serves as the primary regular of red cell production in mammals. Recombinant erythropoietin has been used in the treatment of anemia associated with numerous chronic diseases. Ex vivo therapy of recombinant EPO, however, requires large dose and frequent administration, which gives financial impact to the patients. In vivo delivery of EPO using gene therapy method can solve this problem.
Methods: Recombinant lentiviral vectors containing the rat EPO gene were made by cotransfection of 293T cell with pRRL-cPPT-CMV-EPO-PRE-SIN, pMDL, pVSVG, and pREV plasmids. These viruses were concentrated and intramuscularly injected into the groin muscles of Fisher 344 rats. Sequential complete blood counts were measured periodically thereafter.
Results : Virus doses of 6x107 infectious units and 6x106 infectious units produced significantly increased hemoglobin and hematocrit values, being 24.9±0.19g/dL, 66.9±0.62%(P<0.01, N=5) and 18.4±0.55g/dL, 54.6±1.17%(P<0.01, N=5), respectively at 40 weeks after injection, over values of control animals receiving normal saline (15.2±0.42g/dL, 44.6±0.49%, N=5).
Conclusion: Lentiviral vectors are able to transduce skeletal muscle and are capable of achieving sustained expression and systemic delivery of EPO following intramuscular administration. Gene therapy using lentiviral vectors may provide a practical strategy for in vivo delivery of therapeutic proteins
Keywords Gene therapy; Erythropoietin (EPO); Lentiviral vector; Skeletal muscle
Korean J Hematol 2003; 38(3): 176-182
Published online September 30, 2003
Copyright © The Korean Society of Hematology.
이미자, 김승택
충북대학교 의과대학 내과학교실, 의학연구소
Mei Zi Li, Seung Taik Kim
Department of Internal Medicine and Medical Institute College of medicine, Chungbuk National University
Background : Erythropoietin (EPO) is a 30.4kDa glycoprotein that serves as the primary regular of red cell production in mammals. Recombinant erythropoietin has been used in the treatment of anemia associated with numerous chronic diseases. Ex vivo therapy of recombinant EPO, however, requires large dose and frequent administration, which gives financial impact to the patients. In vivo delivery of EPO using gene therapy method can solve this problem.
Methods: Recombinant lentiviral vectors containing the rat EPO gene were made by cotransfection of 293T cell with pRRL-cPPT-CMV-EPO-PRE-SIN, pMDL, pVSVG, and pREV plasmids. These viruses were concentrated and intramuscularly injected into the groin muscles of Fisher 344 rats. Sequential complete blood counts were measured periodically thereafter.
Results : Virus doses of 6x107 infectious units and 6x106 infectious units produced significantly increased hemoglobin and hematocrit values, being 24.9±0.19g/dL, 66.9±0.62%(P<0.01, N=5) and 18.4±0.55g/dL, 54.6±1.17%(P<0.01, N=5), respectively at 40 weeks after injection, over values of control animals receiving normal saline (15.2±0.42g/dL, 44.6±0.49%, N=5).
Conclusion: Lentiviral vectors are able to transduce skeletal muscle and are capable of achieving sustained expression and systemic delivery of EPO following intramuscular administration. Gene therapy using lentiviral vectors may provide a practical strategy for in vivo delivery of therapeutic proteins
Keywords: Gene therapy, Erythropoietin (EPO), Lentiviral vector, Skeletal muscle