Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Characteristics of $Malassezia$ $pachydermatis$ Isolated from Dogs and Antifungal Effect of Essential Oils

개에서 분리된 $Malassezia$ $pachydermatis$의 특성과 Essential Oil의 항진균 효과

  • Kim, Joo-Yeon (School of Life Science, Gwangju Institute of Science and Technology) ;
  • Olivry, Thierry (College of Veterinary Medicine, North Carolina State University) ;
  • Son, Won-Geun (College of Veterinary Medicine, Jeju National University)
  • Accepted : 2012.04.16
  • Published : 2012.04.30
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Abstract

This work describes the characteristics of $Malassezia$ $pachydermatis$ isolated from dog ear canals and the effect of essential oils on the growth of this organism. Sterile cotton swabs were used to collect specimens from the external ear canal and culture tests were performed to detect the population size of $Malassezia$ yeast. Using three different isolation media, included Sabouraud dextrose agar (SDA) to isolate common $M.$ $pachydermatis$, and SDA supplemented with olive oil (SDAO) and Leeming's medium (LM) to detect lipophilic yeast, $Malassezia$ spp were isolated from 14 of 18 dogs (77.8%); isolation rates were 33.3% in SDA, 72.2% in SDAO and 66.7% in LM media. All $Malassezia$ spp isolates were identified as $M.$ $pachydermatis$ according to results of PCR amplification, but gross colony morphology and SDA growth rates suggested four different subtypes. Large (LC) and medium colony (MC) types respectively describe large colony (diameter > 3 mm) and medium colony (around 2 mm) after 72 hour incubation, and small (SC) type refers to smaller colony (< 1 mm) even after 5 days incubation; lipid dependent colonies did not grow onto SDA. Large Colony type strains were isolated from 4, 11, and 11 samples, MC type strains from 2, 3 and 1 and SC type strains from 1, 2 and 1 in SDA, SDAO and LM, respectively. Lipid-dependent $M.$ $pachydermatis$ (Lipo) were isolated from 3 samples each in SDAO and LM. Anti-$M.$ $pachydermatis$ activity testing was done using disc-diffusion assays and well diffusion tests. Most essential oils inhibited the growth of $M.$ $pachydermatis$ in a range from 0.5% to 1.0% of essential oils. MIC90 and MIC50 were variable depending upon the nature of essential oils. Thyme oil was found to be highly effective in inhibiting the growth of $M.$ $pachydermatis$ in a range from 0.125% to 0.0625% while marjoram and then tea tree oil exhibited lower inhibitory capacity.

이 연구는 개의 귀 속에서 분리한 $Malassezia$ $pachydermatis$의 특성과 이들 효모에 대한 essential oil들의 항진균효과를 측정한 결과로서 일반적인 $M.$ $pachydermatis$를 분리하기위한 Sabouraud dextrose agar (SDA), olive oil이 첨가된 SDA (SDAO) 배지 및 지방 친화성 효모를 검출하기 위한 Leeming's medium (LM)으로 구성된 세종류의 분리배지가 사용되었다. $Malassezia$ spp는 77.8%의 개로부터 분리되었으며 분리배지에 따라 분리율에 큰 차이를 나타내었으며 지방성분이 포함된 배지에서의 분리율이 일반적으로 사용하는 SDA에서 보다 높았다. 분리된 모든 $Malassezia$ spp는 $M.$ $pachydermatis$로 동정되었지만 육안적으로 보이는 집락의 모양과 SDA에서의 증식속도를 고려했을 때 4개의 아종으로 관찰되었다. 배양 72시간 후 집락의 직경이 3 mm 이상인 큰 집락(LC)과 2 mm 정도인 중간 집락(MC) 및 배양 5일 후에도 1 mm 이상으로 크지지 않는 작은 집락(SC), 그리고 SDA에서 증식하지 않는 지방의존 집락(Lipo)으로 분류되었다. SDA, SDAO 및 LM 배지에서 각 type의 효모가 분리된 정도를 보면, LC type 효모는 각각 4, 11, 11개 시료에서, MC type 효모는 각각 2, 3, 1개 시료에서, SC type 효모는 각각 1, 2, 1개시료에서 분리되었으며 Lipo type은 SDAO과 LM 배지 중 3 곳에서 분리되었다. $M.$ $pachydermatis$에 대한 essential oil의 항진균효과 측정은 디스크 확산법과 well 확산법에 의해 이루어졌으며, 대부분의 essential oil은 0.5에서 1.0%의 농도에서 $M.$ $pachydermatis$ 의 증식을 억제하였다. MIC90과 MIC50은 essential oil의 성분에 따라 다양하였으나, Thyme oil이 가장 억제 효과가 좋았으며 marjoram과 tea tree oil은 비교적 낮은 억제 능력을 나타내었다.

Keywords

References

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