Action modes of the anti-complementary polysaccharides purified from Arecae pericarpium

대복피로부터 정제된 보체활성화 다당의 작용양식

Two kinds of complement activating (anti-complementary) polysaccharides, which were expected to be immunomodulators were purified from Arecae Pericarpium (the pericarps of Areca catechu), and their action modes have been studied. The active polysaccharides, AC-2-IIIa and AC-2-IIIc from Arecae Pericarpium showed dose-dependent anti-complementary activities on $TCH_{50}$. The anti-complementary activities of AC-2-IIIa and AC-2-IIIc in metal ion-free condition were completely decreased in comparison with control whereas in case of $Ca^{2+}$-free condition, these activities were maintained, considerably. Also AC-2-IIIa and AC-2-IIIc showed relatively potent alternative complement pathway activities. Furthermore, after incubation of the normal human serum with polysaccharide of Arecae Pericarpium in the absence of $Ca^{2+}$ ion, a cleavage of C3 in the serum was found to have occurred through immunoelectrophoresis (IEP) with anti-human C3. Also, from the results of IEP using anti-human whole serum, the ratios of the height of 3rd peak to ${\alpha}2-M$ peak by AC-2-IIIa and AC-2-IIIc proved to be $1.50{\pm}0.04$ and $1.22{\pm}0.08$, respectively. These results indicate that the modes of complement activation by AC-2-IIIa and AC-2-IIIc from Arecae Pericarpium are via both the classical pathway and the alternative pathway.

대복피(빈랑나무의 과피)로부터 면역조절 역할이 기대되는 2종의 보체활성화(항보체) 다당을 정제하고 그 작용양식에 대해 검토하였다. 활성다당 AC-2-IIIa 및 AC-2-IIIc는 농도가 증가함에 따라 항보체 활성이 증가하는 양상을 보였으며, 2가 금속이온 부재시 대조구에 비해 거의 완전한 활성의 감소를 보인 반면, $Ca^{2+}$ 이온만을 선택적으로 제거한 경우 활성이 상당량 유지되었다. 또한 이들 활성다당들은 비교적 강력한 보체 제 2경로 활성화능을 나타내었으며, $Ca^{2+}$ 이온 부재 상태에서 정상인의 혈청과 반응시, C3의 분해산물을 anti-human C3를 이용한 면역 전기영동법에 의해 확인할 수 있었다. 또한 anti-human whole serum를 이용한 면역 전기영동 결과, ${\alpha}2-M$ peak 대비 3rd peak의 높이 비율은 AC-2-IIIa가 $1.50{\pm}0.04$, AC-2-IIIc가 $1.22{\pm}0.08$이었는바, 이러한 사실로부터 대복피 유래 AC-2-IIIa 및 AC-2-IIIc의 보체 활성화 양식은 classical 및 alternative pathway 양경로를 모두 경유함을 알 수 있었다.