Abstract:
INTRODUCTION:As congenital cytomegalovirus (CMV) infection is one of the major causes of birth defects and developmental abnormalities, it is essential to develop vaccines and therapeutic antibodies against CMV. Clinical trials demonstrated that the subunit vaccine based on glycoprotein B, which had been believed to be the major target for neutralization, did not induce sufficient protective immunity. On the other hand, it has been reported that the immunization of animals with the Pentamer, the pentameric complex of gH/gL/UL128/UL130/UL131A, induced strong neutralizing antibodies. Here, we sought to clarify whether any polymorphic alterations present in the Pentamer of clinical isolates affect neutralization by anti-Pentamer antibodies. METHODS:Sequences of the genes encoding the Pentamer components of 25 Japanese clinical isolates were determined. Neutralization of infection by two seropositive sera and by anti-Pentamer serum was measured using a CMV reporter cell line based on ARPE-19. RESULTS:Polymorphisms of the amino acid sequence of UL128, UL130, and UL131A ORFs were limited and clustered into two major groups. The identified alterations, except UL128 I140T, were mapped outside of the reported regions recognized by neutralizing antibodies. Anti-Pentamer serum neutralized infection with all isolates to a similar degree and had no correlation with the polymorphic groups. CONCLUSIONS:Our findings indicate that Pentamer antigens prepared from Merlin Fix strain induce antibodies that neutralize infection with all isolates to a similar level and that anti-Pentamer antibodies neutralize CMV infection better than do human sera, suggesting that vaccines and therapeutic antibodies based on Pentamer as an antigen have some promise.
journal_name
Vaccinejournal_title
Vaccineauthors
Kobayashi R,Abe M,Oguri K,Torikai M,Nishimura T,Mori H,Koshizuka T,Inoue Ndoi
10.1016/j.vaccine.2018.08.054subject
Has Abstractpub_date
2018-09-25 00:00:00pages
5983-5989issue
40eissn
0264-410Xissn
1873-2518pii
S0264-410X(18)31183-6journal_volume
36pub_type
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