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Front. Physiol. | doi: 10.3389/fphys.2018.00964

DPEP1 balance GSH involve in cadmium stress response in blood clam Tegillarca granosa

Danli Song1, 2, Zhihua Lin1, Yongjun Yuan1, Guang Qian1,  Chenghua Li2 and  Yongbo Bao1*
  • 1Zhejiang Wanli University, China
  • 2Ningbo University, China

The blood clam, Tegillarca granosa, is a benthic filter feeder with a strong capacity to accumulate and tolerate cadmium (Cd). In our previous study, DPEP1 was shown to be significantly up-regulated under Cd stress based on proteomic analysis. To investigate whether DPEP1 is involved in Cd-induced response, the function of DPEP1 in T. granosa was investigated by integrated molecular and protein approaches. Rapid amplification cDNA end (RACE) assay was established to achieve the complete cDNA sequence of DPEP1 from T. granosa. The full-length cDNA of DPEP1 was 1811 bp, and it contained a 1359-bp open reading frame (ORF), including a 22-amino acid signal peptide. qRT-PCR analysis revealed that DPEP1 was expressed in all examined tissues with the highest expression in gills. At the same time, we investigated DPEP1 gene expression changes after Cd stress at different time points over 96 h. We found that the expression of DPEP1 increased upon initial Cd stress, then it was inhibited, and finally, it was maintained at a low level. Moreover, recombinant DPEP1 showed that higher glutathione (GSH) hydrolysis activity in the temperature range of 30-40 °C, and its maximum activity was at pH=6. Additionally, the results of immunohistochemistry also confirmed that DPEP1 protein was expressed in all test tissues with the highest expression in gills. In addition, the protein expression of DPEP1 by immunohistochemistry was consistent with qRT-PCR results. These results suggested that DPEP1 is probably involved in Cd-induced response by balancing GSH.

Keywords: Tegillarca granosa, DPEP1, Cadmium, enzyme activity, Immunohistochemistry

Received: 27 Mar 2018; Accepted: 29 Jun 2018.

Edited by:

Youji Wang, Shanghai Ocean University, China

Reviewed by:

Maurizio Manera, Università degli Studi di Teramo, Italy
Guangxu Liu, Zhejiang University, China  

Copyright: © 2018 Song, Lin, Yuan, Qian, Li and Bao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Yongbo Bao, Zhejiang Wanli University, Ningbo, China,