Cell Differentiation

Looks and Acts Like Sprouty

Science's STKE  14 Aug 2001:
Vol. 2001, Issue 95, pp. tw8
DOI: 10.1126/stke.2001.95.tw8

Two proteins identified by Wakioka et al. have been named Spred-1 and Spred-2 because they contain a Sprouty domain (SPR) and an Ena/VASP homology domain. Like Sprouty, the Spred proteins appear to inhibit growth factor-mediated stimulation of the Ras-MAP kinase pathway, and when overexpressed, they block differentiation of a neuron and muscle cell line. Endogenous Spred and Ras were found in a complex and also colocalized at the cell surface. Overexpression of Spred increased Ras-Raf interaction. The authors postulate that a Spred-induced increase in Ras-Raf interaction may somehow inhibit Raf activation.

T. Wakioka, A. Sasaki, R. Kato, T. Shouda, A. Matsumoto, K. Miyoshi, M. Tsuneoka, S. Komiya, R. Baron, A. Yoshimura, Spred is a Sprouty-related suppressor of Ras signalling. Nature 412, 647-651 (2001). [Online Journal]