Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Toxins and Antibiotic Resistance of Methicillin-Resistant Staphylococcus aureus Isolated from Clinical Specimens

임상검체로부터 분리된 methicillin 내성 Staphylococcus aureus의 독소 및 항생제 내성

  • Baik, Keun-Sik (Department of Biology, College of Life Science and Natural Resources, Sunchon National University) ;
  • Ki, Gwang-Seo (Department of Biology, College of Life Science and Natural Resources, Sunchon National University) ;
  • Choe, Han-Na (Department of Biology, College of Life Science and Natural Resources, Sunchon National University) ;
  • Park, Seong-Chan (Department of Biology, College of Life Science and Natural Resources, Sunchon National University) ;
  • Koh, Eun-Cho (Department of Biology, College of Life Science and Natural Resources, Sunchon National University) ;
  • Kim, Hyung-Rak (Department of Biology, College of Life Science and Natural Resources, Sunchon National University) ;
  • Seong, Chi-Nam (Department of Biology, College of Life Science and Natural Resources, Sunchon National University)
  • Received : 2010.10.28
  • Accepted : 2010.11.28
  • Published : 2011.02.28
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Abstract

Seventy five methicillin- resistant Staphylococcus aureus (MRSA) strains and 24 methicillin- susceptible S. aureus (MSSA) were isolated from clinical specimens obtained from a hospital in Suncheon, Jeonnam province, Korea, from July to December, 2009. Antibiotic resistance was determined using the disc diffusion method. Genes encoding enterotoxin (SE), toxic shock syndrome toxin-1 (TSST-1), exfoliative toxin (ET) and Panton-Valentine leukocidin (PVL) were detected by multiplex PCR-mediated amplification using specific primers. Sixty (80%) MRSA isolates possessed either one or more toxin genes and the most common pattern that coexisted in MRSA was seb, sec, seg, sei and tst (22.7%) followed by coexistence of sec, seg, sei and tst genes (18.7%). Gene pvl encoding leukocidin was not found. Significant correlation between the production of sec, seg, sei and tst genes was found. MRSAs were resistant to erythromycin (89% of the isolates), gentamicin (70.7%), ciprofloxacin (69.3%), clindamycin (61.3%) and tetracycline (58.7%), while MSSAs were susceptible to the antibiotics with the exception of erythromycin. Toxin genes seb, sec and tst were related to the tetracycline resistance of MRSA.

2009년 7월부터 12월까지 순천 소재 한 병원에 내원한 환자의 검체로부터 methicillin 내성 Staphylococcus aureus (MRSA) 75균주와 methicillin 감수성 S. aureus (MSSA) 24균주를 분리하였다. 분리균의 항생제 감수성 조사는 디스크 확산법을 사용하여 측정하였다. 분리균의 독소 유전자 보유는 multiplex PCR을 이용하여 장독소(enterotoxin; SE), 독성 쇼크 증상 독소 1(toxic shock syndrome toxin-1; TSST-1), 피부박탈성 독소(exfoliative toxin; ET) 및 백혈구 용해 독소(Panton-Valentine leukocidin; PVL) 유전자를 검출하였다. 분리된 MRSA 60개 균주는 1개 혹은 2개의 독소 유전자를 가지고 있으며, 22.7%의 균주가 seb, sec, seg, sei와 tst 유전자를 동시에 보유하고 있었으며 18.7%는 sec, seg, sei와 tst 유전자를 동시에 보유하고 있었다. 백혈구 용해독소를 암호하는 pvl 유전자는 검출되지 않았다. MRSA는 sec, seg, sei와 tst 유전자 보유에 높은 상관성을 보였다. MRSA 균주들은 erythromycin (분리균의 89%), gentamicin (70.7%), ciprofloxacin (69.3%), clindamycin (61.3%)과 tetracycline (58.7%)에 내성이 높은 반면, MSSA 균주들은 erythromycin를 제외한 다른 항생제에는 민감하였다. 독소 유전자 seb, sec와 tst는 tetracycline 내성과 높은 상관관계가 있었다.

Keywords

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