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《Marine Science Bulletin》 2006-05
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Effects of Methionine-Enkephalin on the Free Radicals in the Haemolymph of Chlamys Farreri

SUN Hushan, WANG Yiyan ( College of Life Science, Yantai Normal University, Yantai 264025, Shandong, China )  
The in vitro effects of methionine-enkephalin(met-Enk) on the free radicals and the interrelated enzymes in the haemolymph of Chlamys farreri were studied with the method of spectrophotometric assay. The results were as follows. Except when the concentration of met-Enk was 1 μg/mL, the Catalase (CAT, EC 1.11.1.6) activities of experimental groups in serum and haemocytes were higher than that of control groups; when the concentration of met-Enk was 10 or 50 μg/mL at 1, 3 or 5 h, the contents or activities of the nitric oxide ( NO ), nitric oxide synthase (NOS, EC1.14.13.39 ), H2O2 and CAT of experimental groups in serum and haemocytes were lower than that of control groups. Along with the rise of the concentration of met-Enk, the contents or activities of the NO, NOS, H2O2 and CAT were lowing. The results demonstrate that enkephalin can inhibit the immunity of C hlamys farreri. Along with the increase of the hours of action in the same concentration of met-Enk, the contents or activities of the NO, NOS, H2O2 and CAT were rising. These results demonstrate that there are antagonistic substances of met-Enk in the haemolymph of Chlamys farreri. The enkephalin in the scallop Chlamys farreri may play a important role in its immunological defense.
【Fund】: 国家“973”计划项目(G1999012005)
【CateGory Index】: Q592
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