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南京医科大学学报(自然科学版)                                  第41卷第9期
               ·1304 ·                    Journal of Nanjing Medical University(Natural Sciences)   2021年9月


             ·基础研究·

              铜绿假单胞菌分泌蛋白Pec1抑制肺巨噬细胞吞噬功能的初步

              研究



              林少清 ,舒 磊 ,杜兴冉 ,冯旰珠             1*
                             1
                     1
                                     2
               南京医科大学第二附属医院呼吸与危重症医学科,感染科,江苏                       南京 210011
              1                                      2



             [摘    要] 目的:探讨铜绿假单胞菌分泌蛋白Pec1对小鼠肺泡巨噬细胞株MH⁃S吞噬功能的影响。方法:通过PCR扩增、质粒
              构建、原核表达及蛋白纯化等过程制备重组蛋白Pec1;CCK⁃8法检测Pec1蛋白对MH⁃S细胞增殖的影响;中性红染色检测MH⁃S细
              胞的吞噬功能;荧光显微镜观察 MH⁃S 细胞对铜绿假单胞菌标准菌株 PAO1 灭活菌的吞噬能力。结果:成功构建重组质粒
              pET⁃30a⁃pec1,原核表达并纯化后得到重组蛋白Pec1,其分子量为30.5 kDa。Pec1对MH⁃S细胞的增殖有抑制作用,Pec1浓度
              越高,对细胞增殖的抑制作用越明显;Pec1能减少MH⁃S细胞对中性红的内吞,抑制MH⁃S细胞对铜绿假单胞菌灭活菌的吞噬
              作用。结论:铜绿假单胞菌分泌蛋白Pec1对MH⁃S细胞的吞噬功能有抑制作用。
             [关键词] Pec1;铜绿假单胞菌;吞噬作用
             [中图分类号] R392.12                   [文献标志码] A                      [文章编号] 1007⁃4368(2021)09⁃1304⁃06
              doi:10.7655/NYDXBNS20210905


              Inhibitory effect of Pseudomonas aeruginosa secreted protein Pec1 on phagocytosis of
              pulmonary alveolus macrophages

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              LIN Shaoqing ,SHU Lei ,DU Xingran ,FENG Ganzhu  1*
              1 Department of Respiratory and Critical Care Medicine,Department of Infectious Disease Department,the Second
                                                              2
              Affiliated Hospital of Nanjing Medical University,Nanjing 210011,China
             [Abstract] Objective: This study aims to investigate the effect of the Pseudomonas aeruginosa secreted protein Pec1 on phagocytosis
              of MH⁃S cells. Methods:The recombinant protein Pec1 was prepared by PCR amplification,plasmid construction,induced expression
              and protein purification. The effect of the recombinant protein Pec1 on the proliferation of MH⁃S cells was measured by CCK⁃8 kit.
              Neutral red was used to detect the phagocytic function of MH ⁃ S cells,and the phagocytosis of heat ⁃ inactivated Pseudomonas
              aeruginosa was observed by fluorescence microscope. Results:The recombinant protein Pec1 with the molecular weight of 30.5 kDa
              was successfully expressed and purified. Pec1 had a concentration⁃dependent inhibitory effect on the proliferation of MH⁃S cells. Pec1
              decreased the endocytosis of neutral red and inhibited the phagocytosis of heat⁃inactivated Pseudomonas aeruginosa by MH⁃S cells.
              Conclusion:The Pseudomonas aeruginosa secreted protein Pec1 can inhibit the phagocytosis of MH⁃S cells.
             [Key words] Pec1;Pseudomonas aeruginosa;phagocytosis
                                                                           [J Nanjing Med Univ,2021,41(09):1304⁃1309]



                  铜绿假单胞菌(Pseudomonas aeruginosa,PA)是            鞭毛、菌毛、脂多糖及Ⅲ型分泌系统等破坏呼吸道
                                                                                             [1]
              一种非发酵性、专性需氧的革兰阴性杆菌,在自然                            上皮细胞,在呼吸道定植和感染 。研究发现,下呼
              界广泛存在,可导致呼吸系统、血液系统、泌尿系统                           吸道感染患者支气管肺泡灌洗液分离培养的病原
                                                                                    [2]
              及中枢神经系统等机体多个系统感染。PA 可通过                           菌中,PA 居于第 2 位 。现如今,随着多重耐药
             [基金项目] 国家自然科学基金(81870009)                          (multi ⁃ drug resistant,MDR)及 泛 耐 药(extensively
              ∗                                                 drug resistant,XDR)菌株的出现,防治 PA 引起的感
              通信作者(Corresponding author),E⁃mail: zhu1635253@163.com
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