中国寄生虫学与寄生虫病杂志

• 论著 • 上一篇    下一篇

肿瘤患者弓形虫感染的抗体检测及虫株基因型分析

沈茜1,王林2,方强3,沈继龙1,张林杰1 *     

  1. 1 安徽医科大学免疫学教研室,病原生物学教研室,合肥 230032;2 安徽中医药大学第一附属医院检验中心,合肥 230031;
    3 蚌埠医学院病原生物学教研室,蚌埠 233030
  • 出版日期:2014-10-30 发布日期:2015-01-06

Seroprevalance of Toxoplasma gondii Infection and Genotyping of the Isolates from Cancer Patients in Anhui,Eastern China

SHEN Qian1,WANG Lin2,FANG Qiang3,SHEN Ji-long1,ZHANG Lin-jie1 *   

  1. 1 Departments of Immunology;Department of Pathogen Biology,Anhui Medical University,Hefei 230032,China; 2 Clinical Laboratory,the First Affiliated Hospital of Anhui University of Traditional Chinese Medicine,Hefei 230031,China;3 Department of Parasitology,Bengbu Medical College,Bengbu 233030,China
  • Online:2014-10-30 Published:2015-01-06

摘要:

目的  了解安徽地区肿瘤患者弓形虫感染状况,并鉴定人体弓形虫虫株基因型。  方法  收集安徽省合肥地区三甲医院的门诊和住院肿瘤患者全血356份,采用ELISA检测患者血清中抗弓形虫IgG和IgM抗体。抽提抗体阳性者全血DNA,以弓形虫529 bp高重复序列(AF146527 repeat element)为靶基因进行PCR检测,阳性标本选择10个位点经聚合酶链式反应-限制性片段长度多态性分析(PCR-RFLP)进行基因型分析。  结果  356份肿瘤患者血清中,弓形虫IgG和IgM抗体阳性率分别为5.9%(21/356)和2.3%(8/356),其中IgG和IgM抗体双阳性5份,抗体总阳性率为6.7%(24/356)。对24例抗体阳性者血样进行PCR检测,6份呈阳性,阳性率为25%。对PCR扩增阳性的肿瘤患者血样进行PCR-RFLP弓形虫基因分型,2份血样获得完整分型条带,经鉴定均为Chinese 1型(ToxoDB#9)。  结论  本研究中的肿瘤患者存在弓形虫的隐性感染和活动性感染。初步鉴定2例肿瘤患者感染弓形虫虫株基因型为Chinese 1型。

关键词: 肿瘤, 刚地弓形虫, 基因分型

Abstract:

Objective  To investigate the seroprevalence of Toxoplasma gondii infection and identify the genotypes of T. gondii isolates from cancer patients in Anhui Province.  Methods  Three hundred and fifty-six blood samples were collected from outpatients and hospitalized cancer patients in Hefei, Anhui Province. IgG and gM antibodies specific to T gondii were determined by ELISA. The ELISA positive samples were subjected to detection of Toxoplasma DNA with PCR targeting a 529-bp repeat element of T. gondii. Genotyping of T. gondii isolates was performed using multilocus PCR-RFLP and 10 genetic markers, including 9 nuclear loci, sag1, sag2, sag3, btub, gra6, L358, pk1, c22-8, c29-2, and apico.  Results  Among 356 cancer patients, 21(5.9%) cases were found to be IgG-positive and 8(2.3%) were IgM-positive, and five of them were found to have both IgG and IgM antibodies. The total seroprevalence of Toxoplasma infection was 6.8%. Six PCR-positive samples were genotyped at 10 loci and two of them obtained all genetic markers and identified as the genotype of Chinese 1(ToxoDB#9).  Conclusion  In this study, latent and active toxoplasmosis exist in the patients with malignant tumors, and two isolates are genotyped as the type of Chinese 1(ToxoDB#9) in Anhui, China.

Key words: Cancer, Toxoplasma gondii, Genotyping