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glutathione S-transferase placental form(GST—π)は,解毒代謝にかかわる酵素であると共に,腫瘍マーカーとしても有用であることが示唆されているが,ヒト脳腫瘍における報告は少ない。今回,ヒト脳腫瘍および胎児脳におけるGST—πの発現を免疫組織学的検索によって検討し,更にGST—πの発現と薬剤耐性との相関関係についても比較検討した。対象は手術および剖検によって得た種々のタイプの脳腫瘍100例,胎児脳組織10例および正常脳組織10例であり,Rabbit anti-GST—π抗体を一次抗体としてABC法による免疫組織学的方法でGST—π染色を施行した。
結果は,gliomaでは10w gradeよりhigh gradeになるに従い陽性細胞数の増加を認め,embryonalcarcinomaでは強陽性であったが,胎児脳および正常脳では陰性であり,GST—πのoncofetalな性格に関しては一定の見解は得られなかった。また抗癌剤であるACNU投与後,陽性率の上昇傾向を認めると共に,ACNU非投与例でGST—π陽性率の高い症例は術後の再発率が高い傾向を示した。以上のことから脳腫瘍におけるGST—πの発現は腫瘍マーカーとなり得,また薬剤耐性にも関与すると考えられた。
The activity of glutathione S-transferase placen-tal form (GST-π) was examined in 100 cases in-cluding various histologic subtypes and grading of human brain tumors and 10 cases of fetal brains by immunohistochemical studies.
The 69% of cases with brain tumors were shown to be positive for GST-π. This activity in neuro-epithelial tumors tended to increase in order to tumor grading, however, medulloblastoma and primi-tive neuroectodermal tumor (PNET) were not immunoreactive with GST-π. Embryonal car-cinoma showed strong staining, although fetal brains were negative. The metastatic braintumors showed the same reactivity with GST-π as those of original carcinomas. Moreover, the differenceof GST-π activity was investigated on some brain tumors treated with or without antitumor drug, such as 1-(4-amino-2-methyl-5-pyrimidiny) methyl-3-(2-chloroethyl)-3-nitrosourea hydrochloride (AC-NU). The 85% of recurrent cases showed strong staining with GST-π, and GST-π activity seemed to be incresed after treated with ACNU.
The present study indicated that GST-π might be a useful marker for human brain tumor, as the same conclusion was applicable to other neo-plastic lesions examined previously.
It is suggested that the increased GST-π activity with malignancy of tumor may indicate the ten-dency to recurrence. The presence of such activity in tumor cells may also imply their acquired mul-tidrug resistance. Our findings suggest that the evaluation of GST-π activity in brain tumors will offer a predictive value for eventual behavior of the tumor.
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