Stress-induced hematopoietic failure in the absence of immediate early response gene X-1 (IEX-1, IER3).
Haematologica
; 99(2): 282-91, 2014 Feb.
Article
em En
| MEDLINE
| ID: mdl-24056813
ABSTRACT
Expression of the immediate early response gene X-1 (IEX-1, IER3) is diminished significantly in hematopoietic stem cells in a subgroup of patients with early stage myelodysplastic syndromes, but it is not clear whether the deregulation contributes to the disease. The current study demonstrates increased apoptosis and a concomitant decrease in the number of hematopoietic stem cells lacking this early response gene. Null mutation of the gene also impeded platelet differentiation and shortened a lifespan of red blood cells. When bone marrow cells deficient in the gene were transplanted into wild-type mice, the deficient stem cells produced significantly fewer circulating platelets and red blood cells, despite their enhanced repopulation capability. Moreover, after exposure to a non-myeloablative dose of radiation, absence of the gene predisposed to thrombocytopenia, a significant decline in red blood cells, and dysplastic bone marrow morphology, typical characteristics of myelodysplastic syndromes. These findings highlight a previously unappreciated role for this early response gene in multiple differentiation steps within hematopoiesis, including thrombopoiesis, erythropoiesis and in the regulation of hematopoietic stem cell quiescence. The deficient mice offer a novel model for studying the initiation and progression of myelodysplastic syndromes as well as strategies to prevent this disorder.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Estresse Fisiológico
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Síndromes Mielodisplásicas
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Células-Tronco Hematopoéticas
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Diferenciação Celular
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Proteínas Imediatamente Precoces
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Hematopoese
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article