Journal of Oral Medicine and Pain

Korean Academy of Orofacial Pain and Oral Medicine (대한안면통증구강내과학회)
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Expression of Clusterin in the Salivary Gland under Restraint Stress

구속 스트레스에 의한 타액선 조직내의 Clusterin 발현

  • Park, Hee-Kyung (Department of Oral Medicine, School of Dentistry, Kyung Hee University) ;
  • Chun, Yang-Hyun (Department of Oral Medicine, School of Dentistry, Kyung Hee University) ;
  • Hong, Jung-Pyo (Department of Oral Medicine, School of Dentistry, Kyung Hee University) ;
  • Auh, Q-Schick (Department of Oral Medicine, School of Dentistry, Kyung Hee University)
  • 박희경 (경희대학교 치의학전문대학원 구강내과학교실) ;
  • 전양현 (경희대학교 치의학전문대학원 구강내과학교실) ;
  • 홍정표 (경희대학교 치의학전문대학원 구강내과학교실) ;
  • 어규식 (경희대학교 치의학전문대학원 구강내과학교실)
  • Published : 2008.09.30
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Abstract

The belief that stress leads to illness has a long history. A number of the orofacial disease are also closely associated with stress. Despite research in the relationship of stress and the orofacial diseases leading to statistically significant correlations, the pathology remains vague. In the present study, the expression of clusterin, a stress protein responsible for antiapoptosis and cytoprotection, under restraint stress condition was observed in the submandibular gland, one of the major salivary glands. Sprague-Dawley rats were divided into 2 groups: normal group and restraint stress group. The rats of restraint stress group were placed in the stress cages and then sacrificed at day 0, 3 and 5 day of the experiment. After that, the submandibular glands of all the rats were excised immediately. The levels of clusterin proteins and mRNA in the tissues were measured by immunohistochemistry and Northern blot analyses, respectively. The results were as follows: 1. In the immunohistochemistry, clusterin protein was detected only immediately after the application of restraint stress. 2. In the restraint stress group, at day 3 and 5, histologically apoptosis was induced with karyorrhectic and pyknotic changes. 3. By the restraint stress, acinic cells were destructed earlier than ductal cells. 4. In the Northern blot, mRNA of clusterin was expressed only immediately after the application of restraint stress. The overall results suggest that as an early response to stress, clusterin is expressed in the glands to protect the glandular cells from the stress. But if stress is so strong and prolonged that it can exceed the stress adaptability of the cells, then the cells may undergo apoptosis instead of producing clusterin. An Epidemiologic Study of Symptoms of Temporomandibular Disorders in Korean College Students.

일상생활에서 우리는 항상 스트레스에 노출되어 있으며, 스트레스에 대한 반응은 우리 삶의 질과 건강에 중요한 영향을 미친다. 특히 정서적으로 중요한 구강안면영역에도 다양한 스트레스성 질환이 존재한다. 그러나 스트레스와 질병에 관한 오랜 연구에도 불구하고 스트레스성 구강안면질환의 병인은 아직 명확하지 않다. 이에 저자는 최근 임상의학에서 관심이 집중되어지고 있는 스트레스와 질병에 대한 분자생물학적 접근의 일환으로 스트레스성 구강안면질환의 병인을 규명하고자 본 연구에 임하였다. 즉, 스트레스 단백질로 알려진 clusterin이 스트레스의 생리적 반응으로서 세포보호작용 결과 발현된다는 사실에 기초하여, 스트레스 부여 후 타액선 조직 내에서의 그 발현변화를 추적하였다. Sprague-Dawley계 웅성 백서(200-230g/bw)를 구속 스트레스 부여군(구속장치에 구속한 후 0, 3, 5일에 희생) 및 정상군으로 나누고, 각각 악하선을 적출하였으며, 면역조직화학법 및 Northern Blot을 이용하여 Clusterin의 변화를 관찰하였다. 그 결과는 다음과 같다. 1. 구속 스트레스 부여군의 clusterin 단백질은 실험 즉일군에서 증가되었고, 그 이후에는 감소되었다. 2. 구속 스트레스 부여 3일군과 5일군에서 핵붕괴 및 핵농축 등의 핵변화를 동반한 apoptosis가 유도되었다. 3. 구속 스트레스 부여 결과, 선포세포가 도관세포보다 일찍 세포사하였다. 4. 구속 스트레스 부여군의 clusterin mRNA는 실험 즉일군에서만 미약하게 관찰되었다. 즉, 타액선 조직은 스트레스 단백질인 clusterin을 생산하여 세포를 보호함으로써 스트레스 상황에 적응하지만, 생리적 적응한계를 넘는 스트레스에 노출될 때에는 조직이 apoptosis됨이 확인되었다. 따라서, 본 연구결과는 구강건조증등 스트레스성 타액선관련 증상 및 질환의 병리적 기전에 대한 규명에 도움이 되리라고 생각하며, 또한 clusterin은 향후 생체에 가해진 스트레스에 대한 표식자(marker)로 사용될 수 있을 것으로 사료된다.

Keywords

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