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Molecules 2017, 22(7), 1123;

A Purified Serine Protease from Nereis virens and Its Impaction of Apoptosis on Human Lung Cancer Cells

School of Food and Pharmacy, Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, Zhejiang Ocean University, 1st Haidanan Road, Changzhi Island, Lincheng, Zhoushan 316022, China
Zhejiang Marine Fisheries Research Institution, Zhoushan 316021, China
These authors contributed equally to this paper.
Author to whom correspondence should be addressed.
Received: 9 June 2017 / Accepted: 3 July 2017 / Published: 7 July 2017
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Nereis active protease (NAP) is a novel fibrinolytic active serine protease from the polychaete Nereis virens. In this study, NAP was purified from Nereis virens and the effects of NAP on human lung cancer cells were investigated. Our results indicated that NAP inhibited the proliferation and induced apoptosis of H1299 cells in a time- and dose-dependent manner. The loss of mitochondrial membrane potential, the activation of Bax and cleaved-caspase 3/9, the release of cytochrome C, and the suppression of Bcl-2 and poly-ADP ribose polymerase were observed in NAP-treated H1299 cells by flow cytometry and Western blotting. Moreover, the expression levels of Bax and Bcl-2 mRNA were determined by real-time quantitative polymerase chain reaction and the Bax/Bcl-2 expression ratio was increased in the NAP-treated cell lines. The results indicated that NAP-induced apoptosis may be related to mitochondria mediated apoptosis and occurs through caspase-dependent pathways. Then, the effects of NAP on tumor growth in animal models were observed, where 5 or 10 mg/kg of NAP noticeably reduced tumor volume and weight and increased apoptosis as determined by Western blotting when compared to the negative control group. Therefore, our findings suggest that NAP could be a hopeful anticancer medicine for its propensity to inhibit growth and induce of apoptosis in human lung cancer cells. View Full-Text
Keywords: Nereis virens; serine protease; lung cancer; apoptosis; mitochondrial dysfunction Nereis virens; serine protease; lung cancer; apoptosis; mitochondrial dysfunction

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Tang, Y.; Yu, F.; Zhang, G.; Yang, Z.; Huang, F.; Ding, G. A Purified Serine Protease from Nereis virens and Its Impaction of Apoptosis on Human Lung Cancer Cells. Molecules 2017, 22, 1123.

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