Институт молекулярной биологии и генетики НАН Украины 252143, Киев, ул. Академика Заболотного, 150 При системных аутоиммунных заболеваниях выявляются аутоантитела против многих белков и рибонуклеопротеидов-компонентов аппарата трансляции. Ранее нами было сообщено о выявлении аутоантител против серил-тРНК синтетазы у больных системной красной волчанкой и ревматоидным артритом. В данной работе нами охарактеризованы аутоантитела против другого компонента аппарата трансляции-тирозил-тРНК синтетазы. В то время как поликлональные антитела ингибировали аминоацилирующую активность фермента до 30% базового уровня, аутоантитела из аутоиммунных сывороток активировали фермент до 280 % базового уровня, чего не наблюдалось для других исследованных в этом направлении аминоацил-тРНК синтетаз. Обсуждаются возможные причины подобного феномена.
The autoantibodies directed against actin and myosine have been detected in the blood sera of patients with dilated cardiomyopathy (DCMP) at the level that was sufficiently higher than in healthy donors. While comparing of the immunogeneicity of these pro teins we have stated that myosine from affected by DCMP myocardium have been more immunogenic then from normal one. In the case of actin the immunogeneicity have been higher for the protein from normal myocard. The investigations of actin by limited proteolysis may suggest that the differencies in immune properties are not connected with primary structure but with structures of higher levels.
In this study two cDNA expressing libraries generated from thyroid papillar carcinomas were screened using SEREX approach. Thirty positive cDNA clones representing seventeen different genes were identified from both libraries. It is important to note, that three of them were isolated previously by other laboratories in SEREX screens of various types of human cancer. These include transcription factor NZF, a-catenin and ВАС RPU-a protein with unknown function. Moreover, we identified a whole panel of novel potential tumor-associated antigens, which would be further investigated. We are particularly interested in more detailed analysis of cathepsin H and transducer of ErbB2 (TOB2), which are differentially expressed in various types of human cancer. We will analyse the frequency of autoantibodies against identified antigens in sera of patients with various malignancies and healthy donors by heterologous screening. It is expected that among the clones isolated in this study, there might be novel cancer-associated markers.
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