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백서의 치아이동 시 피질골 천공이 치주조직의 MMP-1, -8, -13 mRNA의 발현에 미치는 영향

The expression of MMP-1, -8, and -13 mRNA in the periodontal ligament of rats during tooth movement with cortical punching

김성식|김용덕|박미화|전은숙|박수병|손우성|곽춘
대한치과교정학회 (The Korean Association Of Orthodontists)|2008.06|대한치과교정학회지 (The Korean Journal of Orthodontics)|제38권 제3호|pp. 187-201

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키워드

Matrix metalloproteinaseCollagen type I피질골 천공Cortical punching기질단백분해효소I형 교원질
주제분류치의학

초록

본 연구는 피질골 천공을 동반한 교정적인 치아이동이 통상의 교정적인 치아이동과 조직 재형성의 정도에 차이가 존재하는지 알아보기 위하여 시행하였다. 실험동물은 15주령 군 300 - 350 g의 자성 백서(Sprague-Dawley Rat)를 사용하였으며 피질골 천공을 동반한 치아이동 실험군(TMC group, n = 16)과 단순 치아이동 대조군(TM group, n = 16)으로 나누었다. 모든 실험동물에 20 gm 이하의 힘으로 전치부를 이개시키는 치아 이동을 시행하였으며, 실험군은 상악전치부의 직후방 구개측에서 치근을 손상시키지 않도록 직경 1.0 mm의 microscrew를 사용하여 피질골 천공을 하였다. 모든 실험동물은 1, 4, 7, 14일에 희생시켜서 matrix metalloproteinase (MMP)-1, -8, -13 효소의 RT-PCR과 I형 교원질(Collagen type I)과 Tissue inhibitor of metalloproteinase-1 (TIMP-1)의 면역조직화학염색(immunohistochemistry)을 시행하였다. MMP-1은 실험군에서 4일째에 가장 활발한 발현을 보이다가 7일째와 14일째에 조금씩 감소하는 경향을 보인 반면에, 대조군에서는 실험 7일째에 가장 높은 발현을 보이다가 14일째 들어서 감소하는 양상을 보였다. MMP-8은 실험 1일째부터 실험군이 대조군에 비해서 더 많은 발현을 보였으며, 특히 4일째의 실험군에서는 대조군보다 두 배 이상 발현되었다. MMP-13은 실험 1일째의 실험군에서 가장 높은 발현도를 보였으며, 대조군에서는 오히려 미처치 대조군에 비해 더 낮게 발현되었다. I형 교원질의 면역조직화학염색 결과는 실험 4일째부터 압박측에서는 실험군에서 대조군보다 더 많은 교원질의 소실을 보였고, 인장측에서는 대조군이 실험군보다 더 많은 교원질의 염색 소견을 보였다. TIMP-1은 실험 4일째에는 압박측에서 대조군이 실험군보다 치주인대와 치조골의 골세포에서 좀 더 균일한 염색 소견을 보였다. 이상의 실험 결과에서 피질골 천공은 백서의 실험적 치아이동에 있어 치주인대와 치조골 결합 조직의 재형성 속도를 증가시키는 것으로 판단된다. (대치교정지 2008;38(3):187-201)

Abstract

Objective: The aim of this study was to determine whether cortical punching stimulates the expression of matrix metalloproteinase-1, -8, and -13 in orthodontic tooth movement in rats. Methods: A total of 32 male sprague-dawley rats at 15 weeks old were divided into two groups of 16 rats each, to form the tooth movement with cortical punching (TMC) group and tooth movement only (TM) group. A total of 20 gm of orthodontic force was applied to rat incisors to cause experimental tooth movement. Cortical punching was performed on the palatal side near the central incisor with a 1.0 mm width microscrew in the TMC group. The duration of tooth movement was 1, 4, 7, and 14 days. Results: Measurements of the mRNA expression were selected as the means to determine the identification of expression of MMP-1, -8, and -13. In the TMC group, the expression of collagen type I was greater than that of the TM group from day 4 to day 14. Expression of TIMP-1 in the TM group was greater than that of the TMC group in the pressure side of PDL and alveolar bone cell at day 4. In the TMC group, TIMP-1 was expressed at the osteoclast, but not at the tooth surface of the TM group at day 14. Maximum induction of the mRNA of MMP-1 was observed on day 4 in the TMC group, but it was observed on day 7 in the TM group. MMP-8 mRNA of the TMC group was twice greater than that of the TM group at 4 days. In the TMC group, maximum induction of MMP-13 mRNA was observed on day 1. Conclusions: These findings suggested that cortical punching can stimulate remodeling of PDL and alveolar bone connective tissues during experimental orthodontic tooth movement in rats. (Korean J Orthod 2008;38(3):187-201)

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