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J Virol. 1970 December; 6(6): 782-787
Copyright © 1970 American Society for Microbiology. All Rights Reserved.

Immunological Basis of the Adenovirus 8-9 Cross-Reaction

Respiratory Virology Unit, Center for Disease Control, Atlanta, Georgia 30333

ABSTRACT

The dedecon and hexon components of adenovirus types 8 and 9 have been extensively purified for use in establishing the basis of the cross-reaction between these types. Dodecons, the complete hemagglutinins, were purified 304- to 362-fold by fluorocarbon extraction, calcium phosphate batch chromatography, and ion-exchange column chromatography. Hexons, the group complement-fixation (CF) antigens, were purified 230- to 240-fold by erythrocyte adsorption, ion-exchange chromatography, and exclusion chromatography. Component antisera prepared in rabbits were tested in reciprocal fashion with crude virus and dodecon and hexon components. By hemagglutination-inhibition (HI), the dodecons of types 8 and 9 demonstrated the same predominantly one-sided relationship characteristic of the crude antigens. Some neutralizing activity was associated with both dodecons and hexons of each type. However, combining anti-dodecon and anti-hexon sera or producing antisera against the combined dodecon-hexon components resulted in neutralizing titers which were identical to titers obtained with antisera against the crude virus harvests. Dedecons of each type appear to share at least one antigenic determinant with hexons of the same type, and this determinant may reside on the vertex capsomere. Hexons possess group- and type-specific determinants, as shown by CF, neutralization, and immunodiffusion tests, and may exhibit some minor relationship between types 8 and 9. The results with the purified components are consistent with the predominantly one-sided antigenic relationship between types 8 and 9 in the conventional HI tests and the largely type-specific relationship by neutralization tests.

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