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An established kidney cell line from humpback grouper (Cromileptes altivelis) and its susceptibility to bacteria and heavy metals

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Abstract

Humpback grouper (Cromileptes altivelis), one kind of commercial fish with considerable economic value, has been recognized as a promising candidate for mariculture. In the wake of the development of aquaculture industry, the breeding density of C. altivelis has increased gradually, which gave rise to the occurrence of various pathogenic diseases. In our research, we established a new kidney cell line (designated as CAK) from humpback grouper and evaluated its susceptibility to bacteria and heavy metals. The results of our study showed that the optimal growth temperature was 26 °C, and optimal medium was L-15 supplemented with 20% fetal bovine serum (FBS). The sequencing of 18S rRNA gene indicated that CAK cell line was derived from C. altivelis. Chromosome analysis showed that the number of chromosome in CAK was 48. After being transfected of pEGFP-N3 plasmid, high transfection efficiency of CAK was observed, suggesting the potential to be used for the study of foreign functional genes. Moreover, the bacterial susceptibility results revealed that CAK cells were sensitive to Vibrio harveyi and Edwardsiella tarda, especially V. harveyi. Meanwhile, three heavy metals (Hg, Cu, and Cd) had toxic effects on the CAK cells with a dose-dependent manner. To sum up, the CAK cell line might be an ideal tool in vitro for analyzing the function of exogenous genes, bacterial susceptibility, and toxicity assay of heavy metals.

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Funding

This research was supported financially by the National Natural Science Foundation of China (No. 32173009), Key Research and Development Program of Hainan Province (ZDYF2021XDNY298), and Natural Science Foundation of Hainan Province (320QN212).

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Caoying Wei: formal analysis, writing—original draft preparation; Xin Yang: project administration; Minjie Kang: validation; Zhenjie Cao: editing; Yun Sun: supervision, writing—reviewing and editing; Yongcan Zhou: reviewing and editing.

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Correspondence to Yun Sun or Yongcan Zhou.

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Animal care was performed conformity with NIH guidelines (NIH Pub. No. 85e23, revised 1996) and was approved by Animal Care and Use Committee of the Hainan University.

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Wei, C., Yang, X., Kang, M. et al. An established kidney cell line from humpback grouper (Cromileptes altivelis) and its susceptibility to bacteria and heavy metals. Fish Physiol Biochem 48, 521–533 (2022). https://doi.org/10.1007/s10695-022-01065-5

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  • DOI: https://doi.org/10.1007/s10695-022-01065-5

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