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首页> 外文期刊>Cytokine >Tumour necrosis factor-alpha expression in idiopathic dilated cardiomyopathy: correlation to myocardial inflammatory activity.
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Tumour necrosis factor-alpha expression in idiopathic dilated cardiomyopathy: correlation to myocardial inflammatory activity.

机译:特发性扩张型心肌病中的肿瘤坏死因子-α表达:与心肌炎性活动的相关性。

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摘要

High numbers of inflammatory cells are found in a subgroup of patients with idiopathic dilated cardiomyopathy (IDCM). We hypothesized that the extent of inflammation is linked to myocardial TNF-alpha expression in human IDCM. Fourteen patients who consecutively underwent endomyocardial biopsy (EMB) were stratified into two groups-a group with low and a group with high myocardial inflammatory index (MII)-based on immunohistochemical analysis of cellular infiltration and HLA I and II expression. Myocardial TNF-alpha messenger RNA (mRNA) expression was determined by reverse transcriptase polymerase chain reaction, TNF-alpha protein was localized by immunohistochemistry and TNF-alpha serum levels were measured by EIA. IDCM patients with a high MII (n=6) showed a 1. 9-fold higher TNF-alpha mRNA expression when compared to IDCM patients with low MII (n=8, P=0.020). TNF-alpha protein was detected at perinuclear regions of cardiac myocytes and the endothelium. TNF-alpha serum levels were 3.0 (0.55) pg/ml in patients with high MII compared to 1.35 (0.20) pg/ml in patients with low MII (P=0.017). According to immunolocalization cardiac myocytes and the endothelium seem to be the major source of TNF-alpha production. Whether the elevated systemic level of TNF-alpha found in patients with high MII are elaborated by the myocardium or are produced by other tissues representing a general immune activation is not clear. Copyright 2000 Academic Press.
机译:在患有特发性扩张型心肌病(IDCM)的患者亚组中发现大量炎症细胞。我们假设炎症的程度与人IDCM中的心肌TNF-α表达有关。根据对细胞浸润和HLA I和II表达的免疫组织化学分析,将14例连续进行了心内膜活检(EMB)的患者分为两组-一组低和一组高心肌炎性指数(MII)。通过逆转录酶聚合酶链反应测定心肌TNF-α信使RNA(mRNA)的表达,通过免疫组织化学定位TNF-α的蛋白,并通过EIA测定TNF-α的血清水平。与低MII(n = 8,P = 0.020)的IDCM患者相比,MII高(n = 6)的IDCM患者的TNF-αmRNA表达高1. 9倍。在心肌细胞和内皮的核周区域检测到TNF-α蛋白。高MII患者的TNF-α血清水平为3.0(0.55)pg / ml,而低MII患者为1.35(0.20)pg / ml(P = 0.017)。根据免疫定位,心肌细胞和内皮细胞似乎是TNF-α产生的主要来源。 MII高的患者体内发现的升高的TNF-α全身水平是否是由心肌引起的,还是由代表一般免疫激活的其他组织产生的,尚不清楚。版权所有2000学术出版社。

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