Katagiri K, Itami S, Hatano Y, Takayasu S
Department of Dermatology, Oita Medical University, Japan.
Clin Exp Immunol. 1997 May;108(2):289-94. doi: 10.1046/j.1365-2249.1997.d01-1015.x.
Previous studies using in vitro systems with various stimuli have shown that PBMC from patients with AD show increased levels of IL-4 but decreased levels of interferon-gamma (IFN-gamma) compared with PBMC from normal controls. However, in vitro conditions do not always mimic the in vivo condition. We therefore believe that it is important to quantify the expression of these cytokines in freshly isolated PBMC. This study examines the expression of IFN-gamma, IL-4 and IL- 13 mRNA in freshly isolated PBMC from adult patients with AD, from patients with psoriasis vulgaris and from healthy adults, using the semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR) method. Levels of IFN-gamma mRNA were significantly lower in PBMC of patients with AD than in controls. IL-4 mRNA levels did not differ significantly between groups. Conversely, levels of mRNA for IL-13 were significantly greater in PBMC of patients with AD than in controls. An increase in IL-13 expression may regulate the in vivo synthesis of IgE in patients with AD.
以往使用各种刺激的体外系统进行的研究表明,与正常对照的外周血单核细胞(PBMC)相比,阿尔茨海默病(AD)患者的PBMC中白细胞介素-4(IL-4)水平升高,但干扰素-γ(IFN-γ)水平降低。然而,体外条件并不总是能模拟体内情况。因此,我们认为对外周血单个核细胞中这些细胞因子的表达进行定量很重要。本研究采用半定量逆转录聚合酶链反应(RT-PCR)方法,检测了成年AD患者、寻常型银屑病患者和健康成年人新鲜分离的PBMC中IFN-γ、IL-4和IL-13 mRNA的表达。AD患者PBMC中IFN-γ mRNA水平显著低于对照组。各组间IL-4 mRNA水平无显著差异。相反,AD患者PBMC中IL-13的mRNA水平显著高于对照组。IL-13表达的增加可能调节AD患者体内IgE的合成。