شناسایی مولکولی و ارزیابی قدرت تولید پروتئیناز و فسفولیپاز ایزوله‌های محیطی Aspergillus به دست آمده از فضای بیمارستان

نوع مقاله : مقاله های پژوهشی

نویسندگان

1 استادیار، مرکز تحقیقات سلولی و مولکولی، پژوهشکده‌ی بیماریهای غیر واگیر، دانشگاه علوم پزشکی قزوین، قزوین، ایران

2 مرکز تحقیقات میکروبیولوژی پزشکی، دانشگاه علوم پزشکی قزوین، قزوین، ایران

3 گروه آمار، دانشگاه پیام نور شیراز، شیراز، ایران

چکیده

مقدمه: یکی از دلایل عفونت‌های بیمارستانی، پراکندگی اسپورهای Aspergillus در محیط می‌باشد. ترشح آنزیم‌های هیدرولیتیک به عنوان یک عامل ویرولانس در گونه‌های Aspergillus در نظر گرفته می‌شود. این مطالعه، با هدف شناسایی گونه‌های Aspergillus محیطی با تعیین توالی ژن بتا توبولین و ارزیابی قدرت تولید آنزیم پروتئیناز و فسفولیپاز در شرایط آزمایشگاهی انجام شد.روش‌ها: 93 کلنی Aspergillus از فضای بخش اورژانس، جراحی، مراقبت‌های ویژه و اتاق عمل دو بیمارستان آموزشی استان قزوین جمع‌آوری شد. ناحیه‌ی ژنی بتا توبولین به روش Polymerase chain reaction (PCR) تکثیر شد و 40 ایزوله تعیین توالی شدند. جهت ارزیابی قدرت تولید آنزیم پروتئیناز و فسفولیپاز به ترتیب از محیط Yeast carbon base (YCB) و آلبومین سرم گاوی و محیط Egg yolk agar استفاده شد.یافته‌ها: بر اساس توالی بتا توبولین، Aspergillus flavus (3 درصد)، Aspergillus tubingensis (25 درصد)، Aspergillus fumigatus (20 درصد) Aspergillus niger (10 درصد)، Aspergillus sydowii (5/7 درصد)، Aspergillus terreus (5 درصد) و Aspergillus nidulans (5/2 درصد) شناسایی گردید. ارزیابی آنزیم‌های خارج سلولی نشان داد که 5/82 درصد از ایزوله‌ها توانایی پروتئیناز با میانگین پروتئیناز 13/0 ± 73/0 و 5/52 درصد از ایزوله‌های Aspergillus مورد بررسی دارای فعالیت فسفولیپازی با میانگین 17/0 ± 81/0 می‌باشند.نتیجه‌گیری: مطالعه‌ی حاضر نشان داد که سویه‌های محیطی دارای تولید بالای پروتئیناز می‌باشند. بنابراین، به نظر می‌رسد که درک بهتر ارتباط عوامل ویرولانس با عفونت Aspergillus در مطالعات آینده، ضروری می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Molecular Identification and Evaluation of the Ability to Produce Phospholipase and Proteinase by Aspergillus Environmental Isolates Obtained from Hospital

نویسندگان [English]

  • Faezeh Mohammadi 1
  • Nima Hemmat 2
  • Behnaz Familsatarian 2
  • Asieh Maghami-Mehr 3
1 Assistant Professor, Cellular and Molecular Research Center, Research Institute for Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
2 Medical Microbiology Research Center, Qazvin University of Medical Science, Qazvin, Iran
3 Department of Statistics, Shiraz Payame Noor University, Shiraz, Iran
چکیده [English]

Background: One of the causes of nosocomial infections is the dispersion of Aspergillus spores in the environment. The secretion of hydrolytic enzymes is considered as a virulence factor in Aspergillus species. The aim of this study was to identify environmental Aspergillus isolates via sequencing the beta-tubulin gene and evaluating the ability to produce phospholipase and proteinase in vitro.Methods: 93 Aspergillus colonies were collected from the emergency, surgical wards, intensive care unit, and operation theatres of two teaching hospitals in Qazvin Province, Iran. The β-tubulin gene region was amplified using polymerase chain reaction (PCR) method, and 40 isolates were sequenced. Evaluation of proteinase and phospholipase production was performed using yeast carbon base (YCB) with bovine serum albumin and egg yolk agar medium, respectively.Findings: Based on β-tubulin sequence, Aspergillus (A.) flavus (30%), A. tuberculosis (25%), A. fumigatus (20%), A. niger (10%), A. sydowii (7.5%), A. terreus (5%), and A. nidulans (2.5%) were identified. Evaluation of extracellular enzymes showed that 82.5% of the isolates had proteinase ability with a mean proteinase of 0.73 ± 0.13, and 52.5% of the studied Aspergillus isolates had phospholipase activity with a mean of 0.81 ± 0.17.Conclusion: Our study showed that environmental strains have high proteinase production. Therefore, it seems necessary to better understand the association of virulence factors with aspergillosis infection in future studies.

کلیدواژه‌ها [English]

  • Aspergillus
  • Tubulin
  • Peptide hydrolases
  • Phospholipase
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