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首页> 外文期刊>Journal of Parasitology >CARDIAC MYOCYTE HYPERTROPHY AND PROLIFERATING CELL NUCLEAR ANTIGEN EXPRESSION IN WISTAR RATS INFECTED WITH TRYPANOSOMA CRUZI
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CARDIAC MYOCYTE HYPERTROPHY AND PROLIFERATING CELL NUCLEAR ANTIGEN EXPRESSION IN WISTAR RATS INFECTED WITH TRYPANOSOMA CRUZI

机译:克鲁氏锥虫感染的WISTAR大鼠心脏心肌肥大和增殖细胞核抗原的表达

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摘要

Chagasic cardiomyopathy is a major life-threatening complication of Trypanosoma cruzi infection in human beings. This study focuses on the hypertrophic and hyperplastic mechanisms underlying the structural changes of the heart during experimental infection. Proliferating cell nuclear antigen (PCNA) expression, transversal diameter, nuclear area, and number of nuclei per unit volume were determined in the ventricular myocytes of T. cruzi–infected Wistar rats. PCNA expression was enhanced throughout the inflamed myocardium and in the spared areas of the left ventricular wall and the septum. Myocyte width increased from 26 to 75% at the inflammation-free myocardium (P < 0.0001), whereas it decreased 25% at the inflamed left ventricular wall areas (P < 0.001). Nuclear size increased in the inflammation-free myocardium of the left ventricle and the septum (>10–36%, P < 0.01 and >0.2–32%, P < 0.03, respectively) and decreased at the inflamed areas of the left ventricular wall (10–22%, P < 0.02) with respect to the controls. The number of nuclei per unit volume decreased at the inflamed myocardium regardless of topographical location (36–65%) with respect to the controls (P < 0.0001) and in the inflammation-free myocardium of the right ventricle and the septum (<21–37%, P < 0.002 and <8–39%, P < 0.002, respectively). These results show that the heart responds to T. cruzi infection with DNA repair and cell multiplication in the inflamed sites and with hypertrophy of the unaffected myocardium.
机译:恰加斯型心肌病是克鲁氏锥虫感染人类的​​主要威胁生命的并发症。这项研究的重点是在实验性感染过程中心脏结构变化背后的肥大和增生机制。测定感染了克鲁氏锥虫的Wistar大鼠的心室肌细胞中增殖细胞核抗原(PCNA)的表达,横向直径,核面积和每单位体积的核数。 PCNA的表达在整个发炎的心肌以及左心室壁和隔膜的备用区域均得到增强。无炎症心肌的心肌细胞宽度从26%增至75%(P <0.0001),而在发炎的左心室壁区域则降低25%(P <0.001)。左心室和中隔无炎症心肌的核大小增加(分别> 10-36%,P <0.01和> 0.2-32%,P <0.03),并在左心室壁发炎区域减小(10-22%,P <0.02)。相对于对照组(P <0.0001)以及右心室和中隔的无炎症性心肌(无论位置如何,发炎的心肌),单位体积的核数(36-65%)与地形位置无关(36-65%)。分别为37%,P <0.002和<8–39%,P <0.002)。这些结果表明,心脏对克氏锥虫感染的反应是发炎部位的DNA修复和细胞增殖,以及未受影响的心肌肥大。

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  • 来源
    《Journal of Parasitology》 |2002年第5期|p.919-925|共7页
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    Instituto Nacional de Parasitología “Dr. Mario Fatala Chaben”/ANLIS and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina. miriampostan@yahoo.com;

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