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Blood, 29 January 2009, Vol. 113, No. 5, pp. 1201-1203.% E& U! }9 s( Q$ b- e( h7 H% u
Intravenous administration of mesenchymal stem cells genetically modified with extracellular superoxide dismutase improves survival in irradiated mice
* n/ ~" ~& B) `( |Formation of superoxide anion (O2–) after ionizing radiation is a major determinant of the lethality of whole-body radiation exposure.1,2 Irradiated tissues release O2– for days to months after radiation exposure.3 Extracellular superoxide dismutase (ECSOD) is a potent antioxidant enzyme catalyzing the dismutation of O2–. ECSOD has been used in gene therapy of diseases involving oxidative stress.4 Mesenchymal stem cells (MSCs) are multipotent adult stem cells from bone marrow. These cells have advantages over other stem cells in that they can be easily isolated from patients or donors, readily expanded ex vivo, and efficiently gene engineered. Therefore, MSCs hold promise as vehicles for adult stem cell–based gene therapy.5
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# i. {7 B+ @. ITo test the hypothesis that MSCs genetically modified with ECSOD have a radioprotective effect, mouse MSCs (mMSCs) were isolated by their adherence to tissue-culture plastic from 6-week-old female BALB/c mice and ex vivo expanded as previously described.6,7 The cells were differentiated into osteoblasts and adipocytes in vitro, and cell phenotype was analyzed by flow cytometry. Figure 1A shows that the cells express CD105, CD44, CD29, stem cell antigen-1 (Sca-1), and CD13. The cells do not express CD11b, CD34, CD45, CD19, CD31, CD117 (c-Kit), CD135, CD90 (Thy-1.2), or CD73. Therefore, these cells are typical MSCs.
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