PMID: 10652352Feb 1, 2000Paper

Transforming ability of MEN2A-RET requires activation of the phosphatidylinositol 3-kinase/AKT signaling pathway

The Journal of Biological Chemistry
C Ségouffin-Cariou, M Billaud


The RET gene codes for a receptor tyrosine kinase that plays a crucial role during the development of both the enteric nervous system and the kidney. Germ line missense mutations at one of six codons specifying extracytoplasmic cysteines are responsible for two related cancer disorders as follows: multiple endocrine neoplasia type2A (MEN2A) and familial medullary thyroid carcinoma (FMTC). MEN2A and FMTC mutations result in a constitutive catalytic activity and as a consequence convert RET into a dominantly acting transforming gene. Although it has been shown that RET-MEN2 mutants activate several transduction pathways, their respective contribution to the neoplastic phenotype remains poorly understood. Over the past few years, it has become increasingly clear that the transforming ability of several viral and cellular oncoproteins depends on their capacity to activate phosphatidylinositol 3-kinase (PI3K). We now report that RET carrying a representative MEN2A mutation at Cys-634 (termed RET-MEN2A) activates PI3K and its downstream effector, the serine/threonine kinase AKT/protein kinase B. Previous studies have demonstrated that mutation of Tyr-1062, which is the intracellular docking site for Shc and Enigma on RET, abolishes t...Continue Reading


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