Difference in Isoproterenol-Stimulated Cyclic AMP Levels of Lymphocytes between the Subgroups of Depressive Disorders

우울장애 아형간에 Isoproterenol 자극후 임파구 Cyclic AMP Levels의 차이

This study was designed to examine the basal cyclic AMP levels and the $10^{-5}mol/L$ isoproterenol-stimulated cyclic AMP levels of lymphocytes, by which ${\beta}$-adrenoceptor function was shown, between to normal controls and 17 drug free patients(8 major depresive patients and 9 dysthymic patients), who were diagnosed by DSM-III-R. The severity of depression was assessed by Hamilton Rating Scale for Depression (HDRS). Cyclic AMP levels were measured by radioimmunoassay(double antibody). The results were as follows ; 1) HDRS score was significantly higher in major depressive patients($41.8{\pm}4.6$) than in dysthymic patients($24.0{\pm}4.2$)(p<005). 2) There was no Significant difference in basal cyclic AMP levels among normal controls($3.9{\pm}1.7pmol/10^6cells/10min$), major depressive patients($2.1{\pm}0.5pmol/10^6cells/10min$), and dysthymic patients($3.9{\pm}1.8pmol/10^6cells/10min$). 3) There was significant difference in net cyclic AMP levels($10^{-5}mol/L$ isoproterenol-stimulated cyclic AMP levels minus basal cyclic AMP levels) among normal controls($16.5{\pm}6.0pmol/10^6cells/10min$), major depressive patients($3.0{\pm}1.4pmol/10^6cells/10min$), dysthymic patients($10.9{\pm}4.4pmol/10^6cells/10min$)(p <005). 4) The net cyclic AMP levels were significantly correlated with HDRS scores in major depressive patients(${\gamma}=-0.8^6$, p<0.05), but not in dysthymic patients(${\gamma}=0.43$, p=0.25). In conclusion, we suggested that the dysthymic disorder might differ from the molar depressive disorder not only in the severity of depressive symptoms but also in ${\beta}$-adrenergic responsiveness of lymphocytes, which was regarded as a biological marker of depressive disorder.

주요 우울장애 환자와 기분부전장애 환자에서 정상대조군과 비교하여 임파구에 isoproterenol 자극 후 cyclic AMP 생성반응에 차이가 있는지를 알아보고, 이 두 질환군에서 net cyclic AMP levels와 우울정도간의 상관성을 알아보고자 주요 우울장애군 8명, 기분부전장애군 9명, 정상대조군 10명을 대상으로 본 연구를 시행하였다. Cyclic AMP 농도는 방사면역 측정법 (radioimmunoassay)으로 측정하였다. 결과를 요약하연 다음과 같다. 1) HDRS 정수상 주요 우울장애군이 기분부전장애군보다 유의하게 우울정도가 높았다. 2) Isoproterenol 자극전 basal cyclic AMP levels는 정상대조군, 주요 우울장애군, 기분부전장애군간에 차이가 없었다. 3) Isoproterenol $10^{-5}mol/L$ 자극후 net cyclic AMP levels는 정상대조군 주요 우울장애군, 기분부전장애군간에 유의한 차이를 보였다. 4) 주요 우울장애군에서 isoproterenol $10^{-5}mol/L$ 자극후 net cyclic AMP levels와 HDRS 점수간에 유의한 역상관관계를 보였으나, 기분부전장애군에서는 상관관계를 보이지 않았다. 이상의 결과로 저자들은 기분부전장애가 임상적으로는 주요 우울장애의 우울정도가 경미한 한 형태로 보이지만 생물학적으로는 이들 두 질환이 다른 질환일 수 있다고 생각하였다.