Cell Transformation by PTP1B Truncated Mutants Found in Human Colon and Thyroid Tumors.

Cell Transformation by PTP1B Truncated Mutants Found in Human Colon and Thyroid Tumors.
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人结肠癌和甲状腺肿瘤中发现的 PTP1B 截短突变体的细胞转化

DOI:
10.1371/journal.pone.0166538
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发表时间:
2016
期刊:
影响因子:
3.7
通讯作者:
Zheng X
Zheng X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mei W;Wang K;Huang J;Zheng X

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Expression of wild-type protein tyrosine phosphatase (PTP) 1B may act either as a tumor suppressor by dysregulation of protein tyrosine kinases or a tumor promoter through Src dephosphorylation at Y527 in human breast cancer cells. To explore whether mutated PTP1B is involved in human carcinogenesis, we have sequenced PTP1B cDNAs from human tumors and found splice mutations in ~20% of colon and thyroid tumors. The PTP1BΔE6 mutant expressed in these two tumor types and another PTP1BΔE5 mutant expressed in colon tumor were studied in more detail. Although PTP1BΔE6 revealed no phosphatase activity compared with wild-type PTP1B and the PTP1BΔE5 mutant, its expression induced oncogenic transformation of rat fibroblasts without Src activation, indicating that it involved signaling pathways independent of Src. The transformed cells were tumourigenic in nude mice, suggesting that the PTP1BΔE6 affected other molecule(s) in the human tumors. These observations may provide a novel therapeutic target for colon and thyroid cancer.
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