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Eighteen hybridoma lines obtained by immunization of mice with Newcastle disease virus (NDV) lentogenic strain La Sota or velogenic strain Italien produced hemagglutinating monoclonal antibodies. The 18 monoclones were divided into four groups according to their reactivity toward native hemagglutinin neuraminidase protein (HN), nonglycosylated HN precursor, and heat-denatured HN blotted on nitrocellulose membranes. Only group II reagents were reactive toward their targets in all conditions tested. They were considered sequence-specific antibodies. Group I antibodies did not require glycosylation but lacked reactivity towards the denatured glycosylated antigen. Monoclonal antibodies from group III recognized only the native HN. Group IV was made up of a single monoclone that lacked reactivity with NDV Italien but recognized the La Sota strain in hemagglutination inhibition and enzyme-linked immunosorbent assays. Five hybridoma lines produced monoclonal antibodies which neutralized viral infectivity but failed to inhibit hemagglutination. One monoclonal antibody obtained after immunization of mice with NDV La Sota showed a low neutralization index versus NDV Italien. Four monoclonal antibodies derived from mice immunized with NDV Italien showed higher neutralization indices towards this strain. Neither the denatured F protein nor its nonglycosylated precursor was reacted against by the five monoclonal antibodies.

journal of virology

Monoclonal antibodies to hemagglutinin-neuraminidase and fusion glycoproteins of Newcastle disease virus: relationship between glycosylation and reactivity