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Voltage-Gated Potassium Channel Kv1.3 Is Highly Expressed in Human Osteosarcoma and Promotes Osteosarcoma Growth
Department of Orthopaedics, the Affiliated Southeast Hospital of Xiamen University, Zhangzhou 363000, China
Department of Thoracic Surgery, the Affiliated Tangdu Hospital of Fourth Military Medical University, Xi'an 710038, China
Department of Neurology, the Affiliated Southeast Hospital of Xiamen University, Zhangzhou 363000, China
These authors contributed equally to this work.
* Authors to whom correspondence should be addressed.
Received: 26 July 2013; in revised form: 22 August 2013 / Accepted: 10 September 2013 / Published: 23 September 2013
Abstract: Deregulation of voltage-gated potassium channel subunit Kv1.3 has been reported in many tumors. Kv1.3 promotes tumorigenesis by enhancing cell proliferation while suppressing apoptosis. However, the expression and function of Kv1.3 in osteosarcoma are unknown. In the present study, we detected the expression of Kv1.3 in human osteosarcoma cells and tissues by RT-PCR, Western blot and immunohistochemistry. We further examined cell proliferation and apoptosis in osteosarcoma MG-63 cells and xenografts following knockdown of Kv1.3 by short hairpin RNA (shRNA). We found that Kv1.3 was upregulated in human osteosarcoma. Knockdown of Kv1.3 significantly suppressed cell proliferation and increased apoptosis as demonstrated by enhanced cleavage of poly (ADP-ribose) polymerase (PARP) and the activation of Caspase-3/7. Furthermore, adenovirus delivered shRNA targeting Kv1.3 significantly inhibited the growth of MG-63 xenografts. Taken together, our results suggest that Kv1.3 is a novel molecular target for osterosarcoma therapy.
Keywords: Kv1.3; osteosarcoma; shRNA; cell proliferation; apoptosis; immunohistochemistry
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Wu, J.; Zhong, D.; Wu, X.; Sha, M.; Kang, L.; Ding, Z. Voltage-Gated Potassium Channel Kv1.3 Is Highly Expressed in Human Osteosarcoma and Promotes Osteosarcoma Growth. Int. J. Mol. Sci. 2013, 14, 19245-19256.
Wu J, Zhong D, Wu X, Sha M, Kang L, Ding Z. Voltage-Gated Potassium Channel Kv1.3 Is Highly Expressed in Human Osteosarcoma and Promotes Osteosarcoma Growth. International Journal of Molecular Sciences. 2013; 14(9):19245-19256.
Wu, Jin; Zhong, Daixing; Wu, Xinyu; Sha, Mo; Kang, Liangqi; Ding, Zhenqi. 2013. "Voltage-Gated Potassium Channel Kv1.3 Is Highly Expressed in Human Osteosarcoma and Promotes Osteosarcoma Growth." Int. J. Mol. Sci. 14, no. 9: 19245-19256.