Abstract

혈장 cathepsin B 활성도 측정이 갑상선암 및 결절성 증식증의 수술 전 진단에 도움이 되는지를 알아보고자 분화갑상선암 32례, 결절성 증식증 7례, 대조군 5례의 혈장 cathepsin B 발현양상을 대조군과 함께 관찰하였다. 수술시 제거된 여포선암의 암조직, 결절성 증식증 조직의 cathepsin B 발현을 정상 조직과 비교하였다. 혈장 Cathepsin B 활성도는 정상 대조군에서 <TEX>$168.94{\pm}15.10$</TEX> (<TEX>${\times}10^{-2}$</TEX>, mU), 결절성 증식증에서 <TEX>$255.45{\pm}95.68$</TEX> (<TEX>${\times}10^{-2}$</TEX>, mU), 악성종양에서 <TEX>$284.87{\pm}79.32$</TEX> (<TEX>${\times}10^{-2}$</TEX>, mU)로써 악성종양군과 결절성 증식증군에서 cathepsin B 발현이 정상 대조군보다 비교적 높게 나타났다(p<0.05). 혈장 cathepsin B의 정량적 비교를 위한 immunoassay결과에서도 결절성 증식증군(<TEX>$17.64{\pm}7.49\;ng/ml$</TEX>)과 악성종양군(<TEX>$15.50{\pm}7.86\;ng/ml$</TEX>)에서 정상대조군(<TEX>$4.85{\pm}0.61\;ng/ml$</TEX>)보다 높은 수치를 나타내었다(p<0.05). 결절성 증식증 및 악성종양군의 조직 내 cathepsin B mRNA발현이 정상 조직에서보다 높게 나타났다. 따라서 혈장 cathepsin B는 갑상선세포의 비정상적인 증식시에 증가됨을 알 수 있으며, 갑상선암 혹은 결절성 증식증을 스크리닝하는데 이용될 수 있을 것으로 사료된다. To evaluate the feasibility of cathepsin-B levels in preoperatively screening patients with thyroid cancer, we assigned these patients to either the thyroid cancer group (n=32) or the nodular hyperplasia group (n=7). Five healthy volunteers served as controls (n=5). We quantified cathepsin-B expressions in cancerous lesions with follicular carcinoma and hyperplastic lesions with nodular hyperplasia, and compared the degrees to those of normal thyroid tissue, which was obtained from matched contralateral lobe. The activity of serum cathepsin B was significantly higher in patients with thyroid carcinoma (<TEX>$284.87{\pm}79.32$</TEX>, <TEX>${\times}10^{-2}\;mU$</TEX>) and those with nodular hyperplasia (<TEX>$255.45{\pm}95.68$</TEX>, <TEX>${\times}10^{-2}\;mU$</TEX>) than compared to normal control (<TEX>$168.94{\pm}15.10$</TEX>, <TEX>${\times}10^{-2}\;mU$</TEX>) (p<0.05). Based on the results of immunoassay, the concentrations of cathepsin B in the thyroid cancer group (<TEX>$15.50{\pm}7.86\;ng/ml$</TEX>) and the nodular hyperplasia group (<TEX>$17.64{\pm}7.49\;ng/ml$</TEX>) were higher than those of the control group (<TEX>$4.85{\pm}0.61\;ng/ml$</TEX>). The degree of cathepsin-B mRNA expression was significantly higher in cancerous or hyperplastic lesions than normal thyroid tissues from matched contralateral lobe with follicular carcinoma or non-neoplastic thyroid disease. Our results indicate that the activity of serum cathepsin B is a useful indicator in screening patients with nodular hyperplasia or neoplastic thyroid disease and it may be involved in the abnormal proliferation of cells.

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