Journal
JOURNAL OF BIOCHEMICAL AND MOLECULAR TOXICOLOGY
Volume 30, Issue 5, Pages 224-231Publisher
WILEY
DOI: 10.1002/jbt.21781
Keywords
p38 MAPK; Clone; Silver carp; Transcription; Microcystins
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Funding
- National Science Foundation of China [31172415, 31472285]
- Fund for Cultivation of Excellent Doctoral Dissertations of Henan Normal University [YBPY 201503]
- Key Subjects of Biology and Ecology in Henan Province, China
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The sequence of p38MAPK in silver carp (Hm-p38a) was cloned and sequenced. Additionally, the acute toxicity of crude microcystins (MCs) on silver carp and induction expression of Hm-p38a by MCs exposure were also determined in this study. The results reveal that the length of Hm-p38a is 2418 bp and it contains a 1086 bp open reading frame. Hm-p38a could encode 361 amino acids. Sequence analysis indicates that Hm-p38a contains the conserved structures of Thr-Gly-Tyr motif and substrate binding site Ala-Thr-Arg-Trp, and it is highly conserved in fish. Phylogenetic analysis reveals that Hm-p38a is more closely related to fish than mammals and it belongs to p38 alpha subfamily. Moreover, Hm-p38a in silver carp is constitutively expressed in all examined tissues. In addition, our results indicate that MCs exposure significantly promotes the transcription of Hm-p38a in fish liver or kidney, suggesting that mitogen-activated protein kinase should also be the signal pathway of MCs hepatotoxicity in fish. (C) 2016 Wiley Periodicals, Inc.
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