不同培养基上空肠弯曲菌生长特性及外膜蛋白表达差异的初步研究

目的 探讨不同培养基对空肠弯曲菌(CJ)的生物学特性和外膜蛋白表达的影响.方法 采用改良布氏、改良布氏血、改良卵黄等3种培养基培养CJ,48 h后进行菌落观察、菌体观察、动力学试验、生物化学检验、间接荧光检测等初步确定生物学特性,比较3种培养基上CJ生长特性的差别.采用0.2 mol/L、pH 2.2甘氨酸-HCl缓冲液抽提CJ外膜蛋白,SDS-PAGE电泳后,灰度扫描观察比较不同培养基上CJ的28 000～31000外膜蛋白表达差异.结果 改良卵黄培养基上CJ的生长特性典型,并且其菌体形态较另外两种培养基粗壮,繁殖速度更为快速,改良卵黄培养基来源的CJ的28000～31 000外膜蛋白的表达较改良布氏血培养基丰富.结论 改良卵黄培养基培养CJ是一种生长特性典型、28000-31000外膜蛋白表达丰富的培养基,该培养基的选择和使用将为该类蛋白的CJ亚单位疫苗大规模制备、CJ的流行病学检验、食品安全卫生检验检疫奠定重要基础.

Abstract：

Objective To evaluate the biological characteristics of Campylobacter Jejuni (CJ) cultured on different culture media and their expression abundance of outer membrane proteins (OMPs). Methods CJ was cultured on the improved Bull's medium yolk agar, improved Bull's blood agar or improved Bull's agar for 48 h. The biological characteristics of the bacteria, including the colony feature, morphology, motility, biochemistry, and results of indirect fluorescence test were observed and compared. OMP of the cultured CJ was extracted using 0.2 mol/L and glycine-hydrochloride buffered solution (pH 2.2) and identified by SDS-PAGE to compare the expression abundance of the OMPs with molecular weight of 28-31 kD. Results CJ exhibited typical biological characteristics with larger cell body and more rapid growth on improved Bull's medium yolk agar than those on improved Bull's blood agar and improved Bull's agar. The bacteria grown on improved Bull's medium yolk agar showed also greater expression abundance of the OMPs with molecule mass between 28 kD and 31 kD. Conclusion Improved Bull's medium yolk agar allows rapid growth of CJ with typical biological characteristics and enhanced expression of the OMPs with molecular weight of 28 -31 kD, and can be widely used in CJ subunit vaccine development, CJ epidemiological survey, CJ food safety examination, and CJ quarantine.

Growth characteristics of Campylobacter Jejuni on different culture media and their expression of outer membrane proteins

Objective To evaluate the biological characteristics of Campylobacter Jejuni (CJ) cultured on different culture media and their expression abundance of outer membrane proteins (OMPs). Methods CJ was cultured on the improved Bull's medium yolk agar, improved Bull's blood agar or improved Bull's agar for 48 h. The biological characteristics of the bacteria, including the colony feature, morphology, motility, biochemistry, and results of indirect fluorescence test were observed and compared. OMP of the cultured CJ was extracted using 0.2 mol/L and glycine-hydrochloride buffered solution (pH 2.2) and identified by SDS-PAGE to compare the expression abundance of the OMPs with molecular weight of 28-31 kD. Results CJ exhibited typical biological characteristics with larger cell body and more rapid growth on improved Bull's medium yolk agar than those on improved Bull's blood agar and improved Bull's agar. The bacteria grown on improved Bull's medium yolk agar showed also greater expression abundance of the OMPs with molecule mass between 28 kD and 31 kD. Conclusion Improved Bull's medium yolk agar allows rapid growth of CJ with typical biological characteristics and enhanced expression of the OMPs with molecular weight of 28 -31 kD, and can be widely used in CJ subunit vaccine development, CJ epidemiological survey, CJ food safety examination, and CJ quarantine.