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Tissue distribution of olive flounder VDAC2 and its expression in fish cell lines

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Abstract

Voltage-dependent anion channel (VDAC) is located in the mitochondrial outer membrane, which plays a crucial role in regulating cell life and death. In this study, the tissue distribution of olive flounder Paralichthys olivaceus VDAC2 (PoVDAC2) was detected by quantitative real-time PCR and Western blot analysis. The qRT-PCR results showed that the expression level of PoVDAC2 was abundant in heart, muscle and gill tissues. Western blot analysis revealed a protein of 32 kDa detected in all six tissues. Furthermore, a recombinant eukaryotic expression plasmid pEGFP-N3-PoVDAC2 was successfully constructed and transiently expressed the fusion protein in fish cell lines. Subcellular localization indicated that PoVDAC2-GFP was distributed in a punctate mitochondria-like pattern throughout the cytoplasm in flounder embryonic cells (FEC). The distribution of native VDAC2 in untransfected fish cells was also investigated by immunofluorescence microscopy. The punctate VDAC2 fluorescence signals of both FEC and EPC cells were identically observed in the cytoplasm but not in the nucleus. These results laid a foundation for investigating the functional relevance of VDAC response to pathogens in flounder.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 31272692), Qinglan Project of Jiangsu Province (No. QL2014013) and Team of Provincial Science and Technology Innovation of Henan High Education (No. 15IRTSTHN018).

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Correspondence to Aijun Lü.

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Aijun Lü and Xiucai Hu have contributed equally to this work.

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Lü, A., Hu, X., Li, L. et al. Tissue distribution of olive flounder VDAC2 and its expression in fish cell lines. Fish Physiol Biochem 41, 899–907 (2015). https://doi.org/10.1007/s10695-015-0056-7

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  • DOI: https://doi.org/10.1007/s10695-015-0056-7

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