Abstract
Abstract. The aim of the study is evaluation of links between presence in blood of specific pre-existing IgG to respiratory-syncytial virus (RSV), clinical course of RSV infection and character specific to RSV humoral immune response in patients of different ages. The antibodies were detected by ELISA using whole RS virus or synthetic peptides corresponded to the selected determinants of the envelope RSV proteins. It was shown that RS specific maternal IgG antibodies passively transferred to babies in utero can circulate in the blood up to 10 months of life. The analysis of paired sera of 45 babies in the age of 1–10 months revealed firstly that presence of maternal IgG specific antibodies to the conservative B-cell immunogenic determinants of the F-protein (amino acids 221–232) and/or the G-protein (amino acids 152–164 and 184–198) is coupled with more high morbidity of primary RSV infection (89% versus 56%, p = 0.023), and also with more high frequency of complicated by bronchus obstruction course of the disease (81% versus 20%, р = 0.001) in compare with babies who were serologically negative to the maternal determinants specific antibodies. The correlation analysis has shown that the high presence of maternal determinant-specific IgG in the blood in babies till 10 months of life is associated in the case of primary infection with disbalance of humoral anti-viral immune response: intensive synthesis of serum RSV IgA. This is evidence of complicated course of infection with simultaneous suppression of response to RSV specific IgG. As opposed to the primary RSV infection in patients older than 3 years (n = 121) it was not detected links between anamnestic determinant-specific IgG synthesized by own immune system as the results of previous disease episodes and synthesis of anti-RSV IgG, IgM, IgE and IgA in RSV re-infections. In the contrast to babies in more older patients the feedback connection between level of pre-existing determinant-specific “memory IgG” and diagnostics of RSV infection has been established.
Highlights
Адрес для переписки: Кривицкая Вера Зорьевна, к.б.н., ведущий научный сотрудник лаборатории биотехнологии диагностических препаратов ФГБУ НИИ гриппа МЗиСР РФ
The analysis of paired sera of 45 babies in the age of 1–10 months revealed firstly that presence of maternal IgG specific antibodies to the conservative B-cell immunogenic determinants of the F-protein and/or the G-protein is coupled with more high morbidity of primary respiratory-syncytial virus (RSV) infection (89% versus 56%, p = 0.023), and with more high frequency of complicated by bronchus obstruction course of the disease (81% versus 20%, р = 0.001) in compare with babies who were serologically negative to the maternal determinants specific antibodies
Queiroz D., Durigon E.L., Botosso V.F., Ejzemberg B., Vieira S.E., Mineo J.R., Yamashita C., Hein N., Lopes C.L., Cacharo A.L., Stewien K.E. Immune response to respiratory syncytial virus in young Brazilian children // Braz
Summary
Цель работы — оценка связи между содержанием в крови предсуществующих IgG, специфичных к респираторно-синцитиальному вирусу (РСВ), течением РСВ-инфекции и характером РСВспецифического гуморального ответа у пациентов различных возрастных групп. Анализ парных сывороток 45 детей в возрасте 1–10 месяцев впервые выявил, что наличие материнских IgG, специфичных к консервативным В-клеточным иммуногенным детерминантам F-белка (аминокислотная последовательность 221–232) и/или G-белка РСВ (последовательности 152– 164 и 184–198), сопряжено с более высокой частотой заболеваемости первичной РСВ-инфекцией (89% против 56%, p = 0,023), а также повышенной частотой осложненного бронхообструкцией течения заболевания (81% против 20%, р = 0,001) по сравнению с детьми, серонегативными в отношении материнских эпитоп-специфических антител. Корреляционный анализ показал, что высокое содержание в крови материнских эпитоп-специфичных IgG при первичной РСВ-инфекции у детей до 10 месяцев жизни ассоциировано с дисбалансом гуморального противовирусного иммунного ответа: интенсивным синтезом сывороточных анти-РСВ IgА, что является признаком осложненного течения заболевания, при одновременной супрессии ответа со стороны РСВ-специфических IgG.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
