대장용종에서 ILK (Integrin-linked kinase)와 beta-catenin의 발현
Integrin-linked kinase (ILK) and β-catenin expression in colon polyps
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목적: ILK와 beta-catenin을 통한 세포전달은 여러 악성 질환의 시작과 진행에 있어서 중요하다. ILK는 beta-catenin의 전사를 조절하며 암세포에서 세포 이동 및 침습에 관여한다. 최근에 대장암과 전구 단계인 샘종에서 ILK와 beta-catenin이 발현한다는 연구가 있었다. 이에 저자들은 대장용종에서 육안적 및 병리학적 소견의 차이에 따른 ILK와 beta-catenin의 발현을 알아보았다. 방법: 비악성 질환으로 수술한 6명의 정상 대장 조직(6)과 대장용종절제술로 획득한 용종을 모양에 따라 유경성 용종(Ip, 16), 무경성 용종(Is, 22) 및 측방 발육형 종양(laterally spreading tumor LST, 24)으로 나누었다. 또한 현미경적 소견에 따라 관샘종(TA, 47)과 과형성 용종(HP, 15)으로 나누고 관샘종은 이형성의 정도에 따라 나누었다. 이들 조직에서 ILK와 beta-catenin의 발현을 면역화학염색법으로 비교하였다. 결과: 용종의 육안적 모양에 따라 Ip, Is, LST에서 ILK, beta-catenin의 발현의 차이는 통계적으로 차이가 없었다(p> 0.05). 조직학적으로 ILK, beta-catenin의 발현은 과형성 용종보다 관상 샘종에서 발현이 증가하였다(p<0.05). 관상 샘종에서는 이형성의 정도가 심할수록 ILK와 beta-catenin의 발현이 높았다(p<0.05). 전체 용종에서 ILK의 발현이 높은 용종의 경우에 beta-catenin의 발현이 높은 경우가 많았다(p< 0.01). 결론: 대장용종에서 ILK와 beta-catenin의 발현은 대장용종의 모양에 따른 차이가 없었고, 샘종이 과형성 용종보다 발현이 증가되었고 샘종의 이형성이 심할수록 발현율이 높았다.
Abstract
Background/Aims: Signaling pathways via integrin-linked kinase (ILK) and β-catenin are important in the initiation and progression of various malignant diseases. ILK modulates the transcription of β-catenin and is implicated in cell migration and invasiveness. Recently, premalignant colon polyps were found to express ILK and β-catenin. Therefore, we investigated the expression of ILK and β-catenin in colon polyps according to the gross morphology and pathologic type. Methods: Based on morphology, colon polyps (62) were classified as being a pedunculated polyp (Ip, 16), sessile polyp (Is, 22), or laterally spreading tumor (LST, 24). The colon polyps were classified pathologically as tubular adenomas (TAs, 47) and hyperplastic polyps (HPs, 15). The expression levels of ILK and β-catenin in colon polyps and normal colon (6) were evaluated with immunohistochemistry. Results: In normal colon, ILK was not expressed, and β-catenin stained in the cell membrane only. Based on the gross morphology of the colon polyps, no significant difference was seen in the expression of ILK and β-catenin (p>0.05). The expression of both ILK and β-catenin in TAs was greater than that in HPs (p<0.01): the greater the dysplasia in TAs, the more both ILK and β-catenin were expressed (p<0.05). The grade of expression of ILK was correlated with that of β-catenin in colon polyps (p<0.01). Conclusions: The expression of ILK and β-catenin did not differ according to the morphology of colon polyps, but was expressed more in TAs than in HPs, especially in severe dysplasia. (Korean J Med 77:315-320, 2009)
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