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초록

Porphyromonas gingivalis는 치주질환을 야기하는 독성세균으로서, 구강상피세포에 p. gingivalis가 감염되었을 때, 세포형태에 변화를 초래함으로 인해 방어기작이 작동하게 된다. 치주질환과 관련되어 생성된 활성 산소종의 소거에 관여하는 항산화성분은 p. gingivalis 이 감염된 구강상피세포에서 그 분포와 발현수준이 달라지리라 예상된다. 따라서 이번 연구에서는 구강상피세포(KB 세포)에 p. gingivalis가 감염되었을 때 야기되는 활성산소종과 이를 소거하는 역할을 하는 항산화단백들의 역할들을 규명하고자 하였다. 활성산소종 형성을 조절하는 NADPH oxidase 중 NOX4와 Rac1 전사체는 구강상피세포에서 p. gingivalis세균에 의해 증가하였으며 $gp91^{phox}$, Rac2, $p47^{phox}$$p67^{phox}$는 세균에 의한 변화가 관찰되지 않았다. 반면에 $p40^{phox}$ 전사체는 감소하는 경향을 보였다. NOX1 전사체는 p. gingivalis 처리 30분 후 감소하였다가 60분 후에는 다시 증가하는 양상을 보였다. 같은 시간에 NOX 활성화 단백인 NOXA1은 감소하고, NOX 구성단백질인 NOXO1은 증가하는 경향을 보였다. p. gingivalis가 감염된 구강상피세포를 방어하는 항산화단백 발현수준을 평가한 결과, SOD1, 2, 3 모두 p. gingivalis 처리시간에 따라 증가하는 양상을 보였다. GPx 발현 양상도 SOD와 유사하게 나타났다. $H_2O_2$를 소거하는 Prx는 감염된 KB 세포에서 Prx4와 Prx5가 4-6배 증가하는 것을 알 수 있었다. 반면 endocytosis 과정 중 $H_2O_2$ 생산은 변화되지 않았다. 이번 연구의 결과, p. gingivalis의 감염은 KB 세포의 NOX4와 Rac1의 NADPH oxidase 발현을 증가시켰으며, NOX1은 NOXA1과 NOXO1의 조절에 의해 영향을 받음을 알 수 있었다. 또한 항산화기작으로는 SOD, GPx, Prx가 증가하였는데, 이것은 Prx4와 Prx5가 중요한 역할을 할 것을 시사하였다.

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