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J Virol. 1985 February; 53(2): 651-657

Neutralizing monoclonal antibodies to Theiler's murine encephalomyelitis viruses.

ABSTRACT

Theiler's murine encephalomyelitis viruses (TMEV) are serologically related picornaviruses which cause both enteric and neurological disease in mice. The biological activities of TMEV vary between the two different TMEV subgroups (TO and GDVII) and with different passage histories of the same TMEV strain (e.g., mouse brain-passed versus tissue culture-passed DA strain of the TO subgroup). We raised neutralizing monoclonal antibodies (mAbs) against tissue culture-passed DA and GDVII strains of TMEV. We produced two mAbs against the DA strain which neutralized all members of the TO subgroup, but not the GDVII subgroup strains (GDVII and FA); these two DA mAbs reacted similarly with both mouse brain-passed DA and tissue culture-passed DA. Of six neutralizing GDVII mAbs, four reacted only to GDVII and FA, whereas two neutralized TO strains as well. These mAbs demonstrate the presence of TMEV group-specific as well as subgroup-specific neutralization and substantiate the division of TMEV into two distinct subgroups. On Western immunoblots one of the two DA mAbs reacted against isolated DA VP1, two GDVII mAbs (which were TMEV group specific) reacted against isolated GDVII VP1 and DA VP1, and the other DA mAb and four other GDVII mAbs required an intact virion conformation for reactivity. An analysis of the epitopes recognized by these mAbs may elucidate sites important in TMEV biological activities.

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