The role of Cdk5 in neuroendocrine thyroid cancer.
The role of Cdk5 in neuroendocrine thyroid cancer.
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DOI:
10.1016/j.ccr.2013.08.027
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发表时间:
2013-10-14
期刊:
影响因子:
50.3
通讯作者:
Bibb JA
中科院分区:
文献类型:
--
作者:
Pozo K;Castro-Rivera E;Tan C;Plattner F;Schwach G;Siegl V;Meyer D;Guo A;Gundara J;Mettlach G;Richer E;Guevara JA;Ning L;Gupta A;Hao G;Tsai LH;Sun X;Antich P;Sidhu S;Robinson BG;Chen H;Nwariaku FE;Pfragner R;Richardson JA;Bibb JA
Medullary thyroid carcinoma (MTC) is a neuroendocrine cancer that originates from calcitonin-secreting parafollicular cells, or C cells. We found that Cdk5 and its cofactors, p35 and p25, are highly expressed in human MTC and that Cdk5 activity promotes MTC proliferation. A conditional MTC mouse model was generated and corroborated the role of aberrant Cdk5 activation in MTC. C cell-specific overexpression of p25 caused rapid C cell hyperplasia leading to lethal MTC, which was arrested by repressing p25 overexpression. A comparative phosphoproteomic screen between proliferating and arrested MTC identified the retinoblastoma protein (Rb) as a crucial Cdk5 downstream target. Prevention of Rb phosphorylation at Ser807/811 attenuated MTC proliferation. These findings implicate Cdk5 signaling via Rb as critical to MTC tumorigenesis and progression.
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