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Blood, 1 May 2004, Vol. 103, No. 9, pp. 3355-3361.
Prepublished online as a Blood First Edition Paper on February 5, 2004; DOI 10.1182/blood-2003-04-1011.
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HEMATOPOIESIS
Kostmann syndrome: severe congenital neutropenia associated with defective expression of Bcl-2, constitutive mitochondrial release of cytochrome c, and excessive apoptosis of myeloid progenitor cells
Göran Carlsson,
Andrew A. G. Aprikyan,
Ramin Tehranchi,
David C. Dale,
Anna Porwit,
Eva Hellström-Lindberg,
Jan Palmblad,
Jan-Inge Henter, and
Bengt Fadeel
From the Childhood Cancer Research Unit, Department of Woman and Child Health, Karolinska Hospital, Stockholm, Sweden; Department of Pathology, Karolinska Hospital, Stockholm, Sweden; Department of Medicine, Huddinge University Hospital, Stockholm, Sweden; Division of Molecular Toxicology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden; and the Department of Medicine, University of Washington, Seattle, WA.
Kostmann syndrome, or severe congenital neutropenia (SCN), is an autosomal recessive disorder of neutrophil production. To investigate the potential role of apoptosis in SCN, bone marrow aspirates and biopsies were obtained from 4 patients belonging to the kindred originally described by Kostmann and 1 patient with SCN of unknown inheritance. An elevated degree of apoptosis was observed in the bone marrow of these patients, and a selective decrease in B-cell lymphoma-2 (Bcl-2) expression was seen in myeloid progenitor cells. Furthermore, in vitro apoptosis of bone marrow-derived Kostmann progenitor cells was increased, and mitochondrial release of cytochrome c was detected in CD34+ and CD33+ progenitors from patients, but not in controls. Administration of granulocyte colony-stimulating factor (G-CSF) restored Bcl-2 expression and improved survival of myeloid progenitor cells. In addition, cytochrome c release was partially reversed upon incubation of progenitor cells with G-CSF. In sum, these studies establish a role for mitochondria-dependent apoptosis in the pathogenesis of Kostmann syndrome and yield a tentative explanation for the beneficial effect of growth factor administration in these patients. (Blood. 2004;103:3355-3361)
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