Abstract
This study was performed to evaluate the activities of glutathione S-transferase (GST) and lactate dehydrogenase (LDH) in Maddin-Darby canine kidney (MDCK) cells infected with virus and/or treated with amantadine. On cell morphological findings, monolayer fractions in MDCK cells infected with virus were exfolated more than 80% in 1 TCID$_{50}$ group and that in 10 TCID$_{50}$ were completely exfolated after 3 days during infectious process. In proportion to the dose of amantadine, activities of GST and LDH of MDCK cells were significantly decreased and those of LDH in medium fraction were more significantly increased compared with control. According to in both dose and time of virus innoculation, activities of GST and LDH in MDCK cells were significantly decreased in 1 and 10 TCID$_{50}$ infected cells after 3 days. LDH activities in infectious medium were remarkably rised at 10 fold. In case of the cell line inoculated with type A 100 TCID$_{50}$ and additionally treated with amantadine, the decreasing rate to the control in activities of GST and LDH was lower than that in those in case of that infected with virus only. These results suggested that virus infection and amantadine treatment may effect the activity of the detoxicating enzyme in the target cells.
농도와 기간에 따른 바이러스 감염 및 항바이러스제인 amantadine병행 첨가 시 Maddin Darby canine kidney (MDCK) 세포 내의 free radical 해독계 효소인 glutathione S-transferase (GST)와 lactate dehydrogenase (LDH)의 활성 변동을 상호비교 관찰하였다. 바이러스에 감염된 MDCK세포는 감염 3일 후 1 TCID$_{50}$ 군은 80%이상, 10 TCID$_{50}$ 군은 거의 대부분의 단층세포가 탈락되는 병변 효과가 나타났다. Amantadine cytotoxic dose %가 증가함에 따라 MDCK 세포 내의 GST 및 LDH 활성은 농도에 따라 유의하게 감소되었고, 감염배지 내 LDH 활성은 대조군 보다 유의한 증가를 보였다. 인플루엔자 바이러스 type A 접종농도와 기간에 따른 MDCK세포 내의 GST및 LDH활성은 1 및 10 TCID$_{50}$ 감염군에서 감염 3일 후부터 유의하게 감소되었고, 감염배지 내의 LDH활성은 10배 이상 증가되었다. 인플루엔자 바이러스 type A 100 TCID$_{50}$ 감염과 amantadine병행 첨가 시 GST 및 LDH 활성은 바이러스만 감염한 군 보다 MDCK세포 내에서 대조군에 비하여 감소율이 낮았고, 감염배지 중 LDH 활성 역시 증가율이 낮았다. 또한 바이러스 감염 후 amantadine 90 $\mu\textrm{g}$/ml 첨가 시에 세포 내와 감염배지 중에서 가장 낮은 감소와 증가를 나타냈다.
