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De Vita G , Melillo RM , Carlomagno F , Visconti R , Castellone MD , Bellacosa A , Billaud M , Fusco A , Tsichlis PN , Santoro M
Tyrosine 1062 of RET-MEN2A mediates activation of Akt (protein kinase B) and mitogen-activated protein kinase pathways leading to PC12 cell survival
Cancer Research. 2000 Jul;60(14) :3727-3731
PMID: ISI:000088365300009   
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Abstract
The RET tyrosine kinase is a functional receptor for neurotrophic ligands of the glial cell line-derived neurotrophic factor (GDNF) family, Loss of function of RET Is associated with congenital megacolon or Hirschsprung's disease, whereas germ-line point mutations causing RET activation are responsible for multiple endocrine neoplasia type 2 (MEN2A, MEN2B, and familial medullary thyroid carcinoma) syndromes, Here we show that the expression of a constitutively active RET-MEN2A oncogene promotes survival of rat pheochromocytoma PC12 cells upon growth factor withdrawal, Moreover,,ve show that the RET-MEN2A-mediated survival depends on signals transduced by the phosphoinositide 3-kinase (PI3K) and mitogen-activated protein kinase (MAPK) cascades. Thus, in PC12 cells, RET-MEN2A associates with the PI3K regulatory subunit p85 and promotes activation of Akt (also referred to as protein kinase B) in a PI3K-dependent fashion; in addition, RET-MEN2A promotes MAPK activation, PI3K recruitment and Akt activation as well as MAPK activation depend on RET-MEN2A tyrosine residue 1062, As a result, tyrosine 1062 of RET-MEN2A is essential for RET-MEN2A-mediated survival of PC12 cells cultured in growth factor-depleted media.
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ISI Document Delivery No.: 337ML Times Cited: 48 Cited Reference Count: 29 AMER ASSOC CANCER RESEARCH