Cytolethal distending toxin-producing Escherichia coli clinical isolates from Mexican children harbor different cdt types causing CDT-induced epithelial pathological phenotypes.

IF 5.5 3区 医学 Q1 IMMUNOLOGY
Jazmin Huerta-Cantillo, Lucia Chavez-Dueñas, Mussaret Bano Zaidi, Teresa Estrada-García, Fernando Navarro-Garcia
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引用次数: 0

Abstract

Cytolethal distending toxins (CDTs), encoded by cdtABC genes, have DNase activity leading to cellular and nuclear distention, resulting in actin remodeling, irreversible cell cycle arrest and apoptosis of target cells. PCR cdt-positive Escherichia coli strains have been isolated from children with diarrhea worldwide. However, toxin production and biological activity of cdt+ strains are rarely confirmed. Here, we characterized the biological activity of cdt+ E. coli of clinical isolates from Mexican children with severe diarrhea and its relationship with the harbored cdt type. Ten isolates from seven patients containing cdt+ E. coli, one isolate from a patient containing cdt- E. coli, and a prototype CDT-producing E. coli were used to determine the harbored cdt-type, cell distention, actin remodeling and cell cycle arrest on epithelial cells. Three isolates harbored cdt type I, one type II, two type III, two type IV and two simultaneously type II and III. Lysates from eight cdt+ E. coli isolates caused cell distention, actin cytoskeletal remodeling and cell cycle arrest but two isolates from the same patient harboring simultaneously cdt type II/III did not. The cdt genes were necessary and enough to cause the cytolethal distending pathology. Mutants in cdtABIC (O86:H34 strain; cdt-I) and cdtABIIC (isolate; cdt-II) were complemented by cdtABIIC genes and both recovered the CDT-induced phenotypes. Transformation of E. coli BL21 by cdtABIIC genes caused this cytolethal distending pathology. These data indicate that cdt + E. coli isolates are potentially dangerous bacteria to cause serious epithelial cell damage and cell death to aggravate childhood diarrhea.

来自墨西哥儿童的产细胞致死扩张性毒素大肠杆菌临床分离株含有不同的cdt类型,导致cdt诱导的上皮病理表型。
细胞致死扩张性毒素(CDTs)由cdtABC基因编码,具有dna酶活性,导致细胞和细胞核膨胀,导致肌动蛋白重塑,不可逆的细胞周期阻滞和靶细胞凋亡。PCR cdt阳性大肠杆菌菌株已从世界各地的腹泻儿童中分离出来。然而,cdt+菌株的产毒和生物活性很少得到证实。本文研究了墨西哥严重腹泻患儿临床分离株cdt+大肠杆菌的生物学活性及其与携带cdt型的关系。采用7例cdt+型大肠杆菌分离株、1例cdt-型大肠杆菌分离株和1株产生cdt的原型大肠杆菌对上皮细胞进行了cdt型、细胞膨胀、肌动蛋白重塑和细胞周期阻滞的检测。3株cdt为ⅰ型,1株为ⅱ型,2株为ⅲ型,2株为ⅳ型,2株同时为ⅱ型和ⅲ型。8株cdt+大肠杆菌分离物的裂解物引起细胞膨胀、肌动蛋白细胞骨架重塑和细胞周期停滞,但来自同一患者的2株同时携带cdt II/III型的分离物没有引起细胞膨胀。cdt基因足以引起细胞致死性扩张病理。cdtABIC (O86:H34)突变体;cdt-I)和cdtABIIC(分离;cdt-II)被cdtABIIC基因补充,两者都恢复了cdt诱导的表型。cdtABIIC基因对大肠杆菌BL21的转化导致了这种细胞致死性扩张病理。这些数据表明cdt + E。大肠杆菌分离株是一种潜在的危险细菌,可引起严重的上皮细胞损伤和细胞死亡,加重儿童腹泻。
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来源期刊
CiteScore
10.60
自引率
0.00%
发文量
29
审稿时长
1 months
期刊介绍: Medical Microbiology and Immunology (MMIM) publishes key findings on all aspects of the interrelationship between infectious agents and the immune system of their hosts. The journal´s main focus is original research work on intrinsic, innate or adaptive immune responses to viral, bacterial, fungal and parasitic (protozoan and helminthic) infections and on the virulence of the respective infectious pathogens. MMIM covers basic, translational as well as clinical research in infectious diseases and infectious disease immunology. Basic research using cell cultures, organoid, and animal models are welcome, provided that the models have a clinical correlate and address a relevant medical question. The journal also considers manuscripts on the epidemiology of infectious diseases, including the emergence and epidemic spreading of pathogens and the development of resistance to anti-infective therapies, and on novel vaccines and other innovative measurements of prevention. The following categories of manuscripts will not be considered for publication in MMIM: submissions of preliminary work, of merely descriptive data sets without investigation of mechanisms or of limited global interest, manuscripts on existing or novel anti-infective compounds, which focus on pharmaceutical or pharmacological aspects of the drugs, manuscripts on existing or modified vaccines, unless they report on experimental or clinical efficacy studies or provide new immunological information on their mode of action, manuscripts on the diagnostics of infectious diseases, unless they offer a novel concept to solve a pending diagnostic problem, case reports or case series, unless they are embedded in a study that focuses on the anti-infectious immune response and/or on the virulence of a pathogen.
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