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Smad5: signaling roles in hematopoiesis and osteogenesis.

Smad5 belongs to the receptor- activated Smad that function as intracellular signal transducers for transforming growth factor-beta superfamily. Smad5 protein is composed of N-terminal domain responsible for DNA-binding, C-terminal domain primarily required for protein-protein interaction, and the linker region containing motif essential for ubiquitinized degradation. Recent investigation reveals Smad5 as a negative regulator of embryonic hematopoiesis in a haploinsufficiency fashion, helping to elucidate the cytogenetic mechanism, by which Smad5 acts as leukemia suppressor. To date, osteogenesis governed by Smad5- mediated signals is delicately orchestrated by its comprehensive interactions with global osteogenesis regulator Runx2, transcriptional repressor Rob and Smad-interacting protein 1. Further delineation of its roles in hematopoiesis and osteogenesis will undoubtedly provide valuable insights into leukemia therapy and tissue engineering.[1]


  1. Smad5: signaling roles in hematopoiesis and osteogenesis. Liu, B., Mao, N. Int. J. Biochem. Cell Biol. (2004) [Pubmed]
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