Abstract
Calcineurin (CN) is a multifunctional protein involved in many important physiological processes in mammalians, but the function of CN in mollusks is still largely unknown. In the present study, through the shell regeneration system, the changes of enzymatic activity of CN were determined in the process of shell regeneration in pearl oyster Pinctada fucata. CN was activated immediately and continuously in the shell regeneration process. The speed of shell regeneration was measured and the ultrastructure of inner shell surface was observed by scanning electron microscopy after inhibiting CN by intramuscular injection of immunosuppresant cyclosporine A (CsA). The results showed that the speed of shell regeneration was delayed and the morphology of calcite and aragonite in the inner shell surface became abnormal when CN was inhibited by CsA. Meanwhile, RT-PCR analysis revealed that the expression of P. fucata BMP-2 in mantle tissue decreased with CsA injection. In vitro secretion level of proteoglycans (PGs) in primary cultures of mantle cells was also decreased when mantle cells were exposed to CsA. Taken together, our results, for the first time, show that CN is involved in the shell formation through regulating the expression of Pf-BMP-2 in mantle tissue, which controls the secretion of PGs/GAGs of the mantle epithelial cells.
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Acknowledgments
This work was supported by the National High Technology Research and Development Program of China (2006AA09Z441 and 2006AA09Z413), the National Natural Science Foundation of China (no. 30530600 and no. 30221003), and the grant J0630647.
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Li, C., Hu, Y., Liang, J. et al. Calcineurin Plays an Important Role in the Shell Formation of Pearl Oyster (Pinctada fucata). Mar Biotechnol 12, 100–110 (2010). https://doi.org/10.1007/s10126-009-9204-3
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DOI: https://doi.org/10.1007/s10126-009-9204-3