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
Bibb JA
中科院分区:
医学1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

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甲状腺髓样癌(MTC)是一种神经内分泌癌,起源于分泌降钙素的滤泡旁细胞或C细胞。我们发现,Cdk 5和它的辅因子,p35和p25,是高度表达在人类MTC和Cdk 5活性促进MTC增殖。产生了条件性MTC小鼠模型,并证实了异常Cdk 5活化在MTC中的作用。C细胞特异性p25过表达引起C细胞快速增生,导致致死性MTC,其通过抑制p25过表达而被阻止。增殖和逮捕MTC之间的比较磷酸化蛋白质组学筛选确定视网膜母细胞瘤蛋白(Rb)作为一个关键的Cdk 5下游目标。阻止Rb在Ser 807/811处的磷酸化减弱了MTC增殖。这些发现暗示通过Rb的Cdk 5信号传导对MTC肿瘤发生和进展至关重要。
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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