Loss of RhoB expression enhances the myelodysplastic phenotype of mammalian diaphanous-related Formin mDia1 knockout mice.
Loss of RhoB expression enhances the myelodysplastic phenotype of mammalian diaphanous-related Formin mDia1 knockout mice.
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DOI:
10.1371/journal.pone.0007102
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发表时间:
2009-09-21
期刊:
影响因子:
3.7
通讯作者:
Alberts AS
中科院分区:
文献类型:
--
作者:
DeWard AD;Leali K;West RA;Prendergast GC;Alberts AS
Myelodysplastic syndrome (MDS) is characterized by ineffective hematopoiesis and hyperplastic bone marrow. Complete loss or interstitial deletions of the long arm of chromosome 5 occur frequently in MDS. One candidate tumor suppressor on 5q is the mammalian Diaphanous (mDia)-related formin mDia1, encoded by DIAPH1 (5q31.3). mDia-family formins act as effectors for Rho-family small GTP-binding proteins including RhoB, which has also been shown to possess tumor suppressor activity. Mice lacking the Drf1 gene that encodes mDia1 develop age-dependent myelodysplastic features. We crossed mDia1 and RhoB knockout mice to test whether the additional loss of RhoB expression would compound the myelodysplastic phenotype. Drf1 −/− RhoB −/− mice are fertile and develop normally. Relative to age-matched Drf1 −/− RhoB +/− mice, the age of myelodysplasia onset was earlier in Drf1 −/− RhoB −/− animals—including abnormally shaped erythrocytes, splenomegaly, and extramedullary hematopoiesis. In addition, we observed a statistically significant increase in the number of activated monocytes/macrophages in both the spleen and bone marrow of Drf1 −/− RhoB −/− mice relative to Drf1 −/− RhoB +/− mice. These data suggest a role for RhoB-regulated mDia1 in the regulation of hematopoietic progenitor cells.
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