Cimentidine에 의(依)한 면역반응조절(免疫反應調節)

Modulation of Immune Response by Cimetidine

최근(最近) 히스타민이 면역반응(免疫反應)을 조절(調節)함이 구명(究明)되고 있으나 생체내(生體內) 실험(實驗) 특(特)히 마우스에서의 연구보고(硏究報告)를 희소(稀少)하다. 본(本) 실험(實驗)에서는 histamine-2-receptor antagonist($H_2$ 차단제(遮斷劑))인 cimetidine과 히스타민이 마우스의 면양적혈구(緬羊赤血球)(SRBC)에 대(對)한 면역반응(免疫反應)에 미치는 영향(影響)을 실험(實驗)하였다. 마우스를 매일(每日) 14일간(日間) 여러가지 농도(濃度)의 cimetidine 으로 전처리(前處理)하고 여러가지 농도(濃度)의 SRBC($10^6,\;10^7$ 및 $10^8$ 세포(細胞))로 면역(免疫)하고 4일(日) 후(後)에 마우스 족척(足蹠)에 SRBC로 야기주사(惹起注射)하여 Arthus반응(反應)과 지연성과민반응(遲延性過敏反應)(DTH)를 족척종창반응(足蹠腫脹反應)으로 측정(測定)하였으며, 체액성면역반응(體液性免疫反應)은 적혈구응집소가(赤血球凝集素價)를 측정(測定)하였다. 수(數) 종(種) 농도(濃度)($10^{-1}M,\;10^{-3}M$, 및 $10^{-5}M$)의 히스타민을 야기주사(惹起注射)와 동시(同時)에 주사(注射)하여 24시간(時間)-DTH를 측정(測定)하여 히스타민 효과(效果)를 평가(評價)하였다. Cimetidine은 DTH를 항진(亢進)시켰으며 그 항진(亢進)은 250 ${\mu}g$의 cimetidine을 투여(投與)하였을 때 현저(顯著)하였다. 그러나 Arthus 반응(反應)과 혈청항체가(血淸抗體價)는 cimetidine 전처리(前處理) 군(群)과 대조군간(對照群間)에 유의(有意)한 차이(差異)가 없었다. 히스타민은 SRBC에 대(對)한 DTH를 투여량-의존성(投與量-依存性) 유형(類型)으로 억제(抑側)하였으며 그 억제(抑制)는 저농도(低濃度)의 항원량(抗原量)($10^6$ 및 $10^7$ SRBC)일때 더 현저(顯著)하였다. 그러나 외인성(外因性) 히스타민은 $10^8$ SRBC로 면역(免疫)하였을 때늘 DTH를 감소(滅少)시키지 않았다. 이상(以上)의 본(本) 실험결과(實驗結果)는 cimetidine이 세포성(細胞性) 면역반응(免疫反應)을 항진(亢進)시키나 체액성(體液性) 면역반응(免疫反應)은 증가(增加)시키지 않으며 내인성(內因性) 및 외인성(外因性) 히스타민 즉시형과민반응(卽時型過敏反應)뿐만 아니라 세포성(細胞性) 면역반응(免疫反應) 조절(調節)에 관여(關與)함을 강력(强力)히 시사(示唆)하는 증거(證據)라고 사료(思料)되었다.

Recent studies have demonstrated that histamine could have a modulatory influence on the immune response in vitro and in vivo. However, the effect of histamine on immune response in mice has not been extensivley analyzed. In the present study the regulatory effects of cimetidine, a histamine-2-receptor antagonist(H2 blocker) and histamine on the immune response to sheep red blood cells(SRBC) were evaluated in mice. Mice pretreated with daily intraperitoneal injection of varying concentrations of cimetidine for 14 days were immunized intraperitoneally with various concentrations of SRBC($10^6,\;10^7,\;and\;10^8$ cells) and challenged 4 days post immunization. The cellular immune response was determined by measuring the footpad swelling reaction. Footpad swelling reaction of each mouse was measured at 3hr(Arthus) reaction) and 24 or 48 hr(delayed reactions) after challenge. The humoral immune response was determined by measuring hemagglutinins to SRBC. Histamine in varying concentrations($10^{-1},\;10^{-3}\;and\;10^{-5}M$(was added in SRBC suspension at the time of antigen challenge into footpad, and 24-hr delayed type hypersensitivity(DTH) was measured. Cimetidine in varying concentrations(10, 50, 250, 1250 and 6250${\mu}g$) enhanced 24-hr DTH and this enhancement of DTH was more pronounced at 250${\mu}g$ of cimetidine. However, there were no significant differences between the cimetidine-pretreated groups and controls in Arthus reaction and hemagglutinin titers. Histamine suppressed the DTH in the dose-dependent fashion. This suppression was more pronounced at lower concentration of immunizing antigen($10^7\;and\;10^6$ SRBC). However, histamine did not diminish the DTH at higher concentration of antigen($10^8$ SRBC). These results present the evidences which strongly suggest that cimetidine enhances the cell-mediated immune response but not significantlly influences the humoral immune response and that exogenous and endogenous histamine is involved in the modulation of cellular immune response as well as immediate hypersensitivity.