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Original Article

^a Department of Pediatric Oncology, Dana Farber Cancer Institute, Boston, Massachusetts 02115
^b Department of Cancer Biology, Dana Farber Cancer Institute, Boston, Massachusetts 02115
^c Department of Pediatrics, University of California San Francisco, San Francisco, California 94143
^d Children's Hospital Oakland Research Institute, Oakland, California 94609
Dept. of Pediatric Oncology, Dana Farber Cancer Institute, Rm. M654, Boston, MA 02115.617-632-5144617-632-5123

jeff_friedman{at}dfci.harvard.edu

Manganese superoxide dismutase 2 (SOD2) is a critical component of the mitochondrial pathway for detoxification of O₂^–, and targeted disruption of this locus leads to embryonic or neonatal lethality in mice. To follow the effects of SOD2 deficiency in cells over a longer time course, we created hematopoietic chimeras in which all blood cells are derived from fetal liver stem cells of Sod2 knockout, heterozygous, or wild-type littermates. Stem cells of each genotype efficiently rescued hematopoiesis and allowed long-term survival of lethally irradiated host animals. Peripheral blood analysis of leukocyte populations revealed no differences in reconstitution kinetics of T cells, B cells, or myeloid cells when comparing Sod2^+/+, Sod2^–/–, and Sod2^+/– fetal liver recipients. However, animals receiving Sod2^–/– cells were persistently anemic, with findings suggestive of a hemolytic process. Loss of SOD2 in erythroid progenitor cells results in enhanced protein oxidative damage, altered membrane deformation, and reduced survival of red cells. Treatment of anemic animals with Euk-8, a catalytic antioxidant with both SOD and catalase activities, significantly corrected this oxidative stress–induced condition. Such therapy may prove useful in treatment of human disorders such as sideroblastic anemia, which SOD2 deficiency most closely resembles.

Key Words: transplantation (fetal liver) • oxidative stress • antioxidant • stem cells • SOD2

© 2001 The Rockefeller University Press

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