Abstract
The protective effect of the human serum albumin, purified from globulins, (HSAGF) and antibodies to hFcRn was studied in RD cells infected with several strains and clones of species B enteroviruses possessing different receptor specificity (echoviruses 3, 9, 11, 30 and coxsackieviruses A9, B4, B5). It was shown that HSA-GF at concentrations of 4% or less protected RD cells from infection with echoviruses 3, 9, 11 and coxsackievirus A9. The antibodies to hFcRn at concentrations of 2.5 ug/mL or less demonstrated the similar spectrum of protective activity in RD cells against infection with echoviruses 3, 9, 11, 30 and coxsackievirus A9. The protective effect of HSA-GF or the antibodies to hFcRn was not observed in RD cells infected with coxsackieviruses B4 and B5 that need coxsackievirus-adenovirus receptor for uncoating. The usage of the previously characterized echovirus 11 clonal variants with different receptor specificity allowed us to define the function of hFcRn as a canyon-binding uncoating receptor in RD cells. The kinetics and magnitude of the observed protective effects correlated with receptor specificity of the enteroviruses used in this work supporting the two-step interaction of DAF-dependent echoviruses with the cellular receptors. In this study, the function of hFcRn was defined in RD cells as a canyon-binding and uncoating receptor for echoviruses and coxsackievirus A9. The two-step interaction of DAF-dependent echoviruses during entry into the cells was confirmed: initially with the binding receptor DAF and subsequently with the uncoating receptor hFcRn.
Highlights
Согласно современной классификации, все типы вирусов ECHO и вирус Коксаки A9 (CVA9), относятся к виду Enterovirus B рода Enterovirus семейства Picornaviridae порядка Picornavirales [1]
It was shown that HSA-GF at concentrations of 4% or less protected RD cells from infection with echoviruses 3, 9, 11 and coxsackievirus A9
Ward T., Powell R.M., Pipkin P.A., Evans D.J., Minor P.D., Almond J.W. Role for beta2-microglobulin in echovirus infection of rhabdomyosarcoma cells
Summary
Цель настоящей работы – определение функции человеческого неонатального рецептора для Fc фрагмента IgG (hFcRn) в качестве общего депротеинизирующего клеточного рецептора для вирусов ECHO (эховирусов) и Коксаки A9 при заражении культуры клеток рабдомиосаркомы человека (RD). Исследовали протективный эффект человеческого сывороточного альбумина, очищенного от глобулинов (HSA-GF) и антител к hFcRn, при заражении культур клеток RD штаммами и клонами энтеровирусов вида В с разной рецепторной специфичностью (эховирусы 3, 9, 11, 30-го типов и вирусы Коксаки A9, B4, B5). Протективный эффект HSA-GF и антител к hFcRn не наблюдался при заражении клеток RD вирусами Коксаки B4 и B5, депротеинизация которых требует участия коксакивирусногоаденовирусного рецептора. Определена роль hFcRn как каньон-связывающего и депротеинизирующего рецептора для эховирусов и вируса Коксаки А9 при репродукции в клетках RD. For citation: Usoltseva P.S., Alimov A.V., Rezaykin A.V., Sergeev A.G., Novoselov A.V. The role of the neonatal FC receptor in the uncoating of echoviruses and coxsackievirus A9.
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