Abstract
Despite that human herpes virus type 6 (HHV-6) is extremely spread worldwide, molecular mechanisms of behind HHV-6 infection pathogenesis remain largely unexplored. No molecular markers were found linked to unfavorable course of HHV-6 infection which could allow to ease up selecting proper therapy and preventing development of complications. The aim of the study was to analyze expression of apoptosis and survival-related genes in blood leukocytes from 7–17-year-old children upon various forms of HHV-6 infection. The analysis was carried out by using DNA microarrays developed by us allowing to assess changes in expression level both of individual mRNAs and total gene set (-Σ). It was shown that during the acute phase of HHV-6 infection mRNA level was shifted toward pro-apoptotic factors. In the convalescence phase, most altered mRNA levels returned to normal. We have identified a set of mRNAs and genes whose expression level was significantly changed in acute disease phase. According to available data, these factors play an important role in regulation of studied signaling pathways. In order to search for HHV-6-associated factors, which markedly affect disease pattern of severe herpesvirus mixed infection, we analyzed significant changes of mRNA and genes expression levels in patients with severe HHV-6+EBV+CMV mixed infection and EBV+CMV mixed infection of moderate severity compared with healthy donors. The levels of 5 mRNAs (FAF1-NM_007051, DAPK2-NM_014326, CASP8AP2-NM_001137667, CASP8-NM_033356, BTK-NM_001287345) and 3 genes (FAS-Σ, Puma/BBC3-Σ, ITCH-Σ) were significantly increased in severe mixed infection comorbid with HHV-6 (EBV+CMV+HHV-6) but without HHV-6 (EBV+CMV) compared with healthy donors. Most of detected factors belong to Fas-mediated apoptosis pathway, and may be considered as candidate prognostic development factors of severe herpes virus infection involving HHV-6. This study profoundly extends existing understanding on molecular pathogenesis of HHV-6 infection involving apoptosis and pro-survival signaling pathways. Marked changes of mRNA and gene levels most likely contributed to the pathogenesis of HHV-6 as well as severe HHV-6+EBV+CMV mixed infection.
Highlights
В настоящее время не выявлено специфических молекулярных факторов неблагоприятного течения Вирус герпеса человека 6 типа (ВГЧ-6) инфекции, которые позволили бы облегчить выбор адекватной терапии и предупредить возникновение осложнений
Positive FC values indicate an increase in the level of mRNA expression compared to donors
Negative FC values indicate a decrease in the level of mRNA expression compared to donors
Summary
Целью настоящей работы является анализ экспрессии генов сигнальных путей апоптоза и выживания в лейкоцитах крови детей 7–17 лет при различных формах течения ВГЧ-6-инфекции. Нами выявлен ряд мРНК и генов, уровни экспрессии которых значительно изменялись в острой фазе заболевания. С целью поиска ВГЧ-6-ассоциированных факторов, влияющих на формирование клинической картины течения тяжелой герпесвирусной микст-инфекции, был проведен анализ выявленных нами значимых изменений уровней экспрессии мРНК и генов у пациентов с тяжелой ВГЧ-6+ВЭБ+ЦМВ микст-инфекцией и ВЭБ+ЦМВ микстинфекцией средней тяжести по сравнению со здоровыми донорами. Библиографическое описание: Сахарнов Н.А., Уткин О.В., Филатова Е.Н., Князев Д.И., Кулова Е.А., Преснякова Н.Б. Анализ экспрессии генов сигнальных путей апоптоза и выживания в лейкоцитах крови детей при различных формах течения ВГЧ-6-инфекции // Инфекция и иммунитет. Выявленные нами значимые изменения уровней экспрессии мРНК и генов с наибольшей вероятностью вносят вклад в патогенез ВГЧ-6 инфекции и тяжелой ВГЧ-6+ВЭБ+ЦМВ микст-инфекции.
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