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Articles
by
Guo-Dong Li |
Total Records (
2 ) for
Guo-Dong Li |
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Yu Zhang
,
Jin Yang
,
Guo-Dong Li
,
Feng Zhang
and
Jie-Sheng Chen
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Two new erbium compounds, [Er2(BDC)3(DMF)2] (1) and [Er2(CQC)3(DMF)3(H2O)] · DMF · H2O (2), where BDC stands for 1,4-benzenedicarboxylate, CQC for 2-(4-carboxyquinolin-2-yl)quinoline-4-carboxylate, and DMF for N,N-dimethylformamide, have been synthesized through pre-heating and cooling-down crystallization. In 1 the Er(III) is seven-coordinate with oxygen atoms from six BDC and one DMF, forming a three-dimensional open-framework structure. Compound 2 possesses a 2D structure based on dinuclear Er(III) building units. The photoluminescence of 1 has also been investigated. |
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Guo-Dong Li
,
Xi Zhang
,
Rong Li
,
Yue-Dan Wang
,
Yan-Li Wang
,
Ke-Jun Han
,
Xiao-Ping Qian
,
Cheng-Gang Yang
,
Ping Liu
,
Qun Wei
,
Wei-Feng Chen
,
Jun Zhang
and
Yu Zhang
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CHP2 (calcineurin B homologous protein 2) was initially identified as a tumor-associated antigen highly expressed in hepatocellular carcinoma. Its biological function remains largely unknown except for a potential role in transmembrane Na+/H+ exchange. In the present study, we observed that ectopic expression of CHP2 promoted the proliferation of HEK293 cells, whereas knockdown of endogenous CHP2 expression in HepG2 inhibited cell proliferation. When inoculated into nude mice, CHP2 transfected HEK293 cells displayed markedly increased oncogenic potential. In analysis of the underlying molecular mechanisms, we found that like calcineurin B, CHP2 was able to bind to and stimulate the phosphatase activity of calcineurin A. In accord with this, CHP2-transfected cells showed increased nuclear presence of NFATc3 (nuclear factor of activated T cells) and enhanced NFAT activity. Finally, both accelerated cell proliferation and NFAT activation following CHP2 transfection could be suppressed by the calcineurin inhibitor cyclosporine A, suggesting an intrinsic connection between these events. Taken together, our results highlighted a potential role of CHP2 in tumorigenesis and revealed a novel function of CHP2 as an activator of the calcineurin/NFAT signaling pathway. |
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