Different interactions of Grb2/Ash molecule with the NGF and EGF receptors in rat pheochromocytoma PC12 cells.

Abstract:

:We have previously shown that nerve growth factor (NGF) induces a rapid and relatively continuous activation of Ras in rat pheochromocytoma PC12 cells while epidermal growth factor (EGF) activates Ras transiently, and that tyrosine kinase activity of the NGF receptor is essential for the activation of Ras (Muroya et al., Oncogene, 7, 277-281, 1992). In order to explore the signaling mechanism from tyrosine kinase to Ras activation in more detail, interactions between two adaptor molecules, Shc and Grb2/Ash, which contain Src homology regions, and their interactions with the NGF and EGF receptors were examined. Both NGF and EGF induced rapid tyrosine phosphorylation of Shc and its association with both the receptors and with Grb2/Ash. When cells were stimulated with EGF at 4 degrees C, the activation of Ras proceeded slowly and MAP kinase activation was quite low. Under such restricted conditions, tyrosine-phosphorylated Shc formed a complex with Grb2/Ash, suggesting that the complex formation may be one of the immediate early responses. In contrast to Shc, Grb2/Ash bound to EGF receptor but did not form a stable complex with the NGF receptor. These results suggest that there may be an alternative pathway for the activation of Ras in PC12 cells.

journal_name

Oncogene

journal_title

Oncogene

authors

Hashimoto Y,Matuoka K,Takenawa T,Muroya K,Hattori S,Nakamura S

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

869-75

issue

3

eissn

0950-9232

issn

1476-5594

journal_volume

9

pub_type

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