بررسی نقش و اهمیت ساختارهای سطحی و آنزیمها در مقاومت دارویی در باسیلوس سرئوس
محورهای موضوعی : باکتری شناسیشیلا جلال پور 1 , حمید ابوسعیدی 2
1 - دانشگاه آزاد اسلامی واحد شهرضا و عضو باشگاه پژوهشگران جوان،اصفهان
2 - گروه داخلی، دانشگاه علوم پزشکی رفسنجان
کلید واژه: لایه-S, باسیلوس سرئوس, مقاومت آنتیبیوتیکی, بتا-لاکتاماز, عفونتهای بیمارستانی,
چکیده مقاله :
سابقه و هدف: لایه-S خارجیترین پروتئین در اغلب آرکیها و باکتری ها است و با مهار ورود آنتی بیوتیک ها منجر به افزایش بیماریزایی در باکتریها میگردد. با توجه به نقش دست پرسنل و سطوح بیمارستان در ایجاد عفونتهای بیمارستانی، آلودگی منابع مزبور با سویه های باسیلوس سرئوس واجد لایه-S و بتا-لاکتاماز منجر به گسترش عفونتهای بیمارستانی مقاوم در برابر آنتیبیوتیکها میگردد. هدف از این پژوهش بررسی فراوانی لایه-S و بتا-لاکتاماز، هم چنین نقش لایه-S در مهار ورود آنتیبیوتیکها در سویههای باسیلوس سرئوس جداسازی شده از دست پرسنل و سطوح بیمارستان می باشد. مواد و روش ها: این پژوهش به صورت مقطعی-توصیفی بر روی 274 نمونه تهیه شده از بیمارستان فوق تخصصی الزهرا و دانشگاه اصفهان در سالهای 1386-1384 در انجام گرفت. برای آماده سازی نمونه ها از کشت 16 ساعته باکتری روی محیط TSA (Tryptone Soya Agar) استفاده شد و نمونه ها توسط 10X SDS-PAGE الکتروفورز شدند. آنتی بیوگرام نمونهها بر اساس روش کربی بائر و تولید بتا-لاکتاماز بر اساس روش اسیدومتریک انجام گرفت. یافته ها: از 274 نمونه جمع آوری شده، فراوانی باسیلوس سرئوس 49/9% بود. از 13 سویه باسیلوس سرئوس جداسازی شده از دست پرسنل، 11 مورد (6/84%) و از 13 سویه باسیلوس سرئوس جداسازی شده از سطوح بیمارستانی 1 مورد (7/7%) نانوساختار لایه-S را تولید نمودند. نتایج آنتی بیوگرام نشان داد که سویههای فاقد لایه-S در مقایسه با سویههای واجد آن حساسیت بیشتری در برابر آنتیبیوتیکها دارند. همچنین تمامی سویههای دارای لایه-S، مولد بتا-لاکتاماز بودند. نتیجه گیری: نتایج این پژوهش نشان دهندهی شیوع سویههای باسیلوس سرئوس واجد لایه-S و بتا-لاکتاماز در بیمارستان میباشد که این امر میتواند منجر به گسترش عفونتهای بیمارستانی مقاوم در برابر آنتیبیوتیک گردد و بنابراین ضرورت انجام تدابیر مناسب به منظور کاهش انتقال عوامل بیماریزا و مقاومت آنتیبیوتیکی در باکتریهای بیماریزا وجود دارد.
Background and Objectives: S-layer is a outer protein in bacteria and archaea which intensifies bacterial pathogenicity due to inhibiting antibiotic’s entrance to cells. Because staffs and hospital surfaces have a major role in nosocomial infections, contaminating this source with S-layer and β–lactamase positive strains of B. cereus can lead to spread the antibiotic resistant nosocomial infections. In this study, in addition to determine the frequency of S-layer and β–lactamase positive strains in hospital environment, their function in inhibition of antibiotic’s entrance has been surveyed. Material and Methods: The descriptive research was performed on 274 samples isolated from Azzahra hospital and Isfahan University during 2005/2007. In order to preparation of samples, 16 hours bacterial culture in TSA (Tryptone Soya Agar) were used and then electrophoresis with 10X SDS-PAGE were performed. Antibiogram were performed with Kirby Bauer method and β–lactamase production, with acidimetric method. Results: From 247 isolated bacteria, frequency of B. cereus strains was %9.49. Eleven sample (84/6%) from 13 isolated B. cereus of staff hand and 1 sample (7/7%) from 13 isolated B.cereus from hospital surfaces produce S-layer nano-structure. According to antibiogram result, non producer S-layer strains, in comparative S-layer producer strains, were more sensitive to antibiotics and all S-layer producer B.cereus strains, produce β–lactamase. Conclusion: Result of this study show high prevalence S-layer and β–lactamase producer B. cereus strains in hospital, that lead to increase antibiotic resistance nosocomial infection and is necessary go on to reduce transfer virulence agent and antibiotic resistant in pathogen bacteria.
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