Antigen-binding activity and allergenicity of heterologous gamma-globulin absorbed from the rectum.
The molecular integrity of rectally absorbed antigens was studied in rats and mice. ABout 2% in the radioactivity of 125I-labelled horse gamma-globulin administered rectally reached the blood circulation. One fifth of this absorbed radioactivity (0.4%) reacted with anti-Fab antibody and about one eight (0.25%) of the original antigen-binding activity was maintained. The results indicated that a small but significant portion of the rectally administered proteins remained intact and retained the immunological function. Rectally-administered proteins induced IgE antibody responses in the rat and the mouse.
D000042:Absorption; D000818:Animals; D000937:Antigen-Antibody Reactions; D006736:Horses / Q000276:immunology; D051379:Mice; D051381:Rats; D012007:Rectum / Q000378:metabolism*; D005719:gamma-Globulins / Q000008:administration & dosage / Q000378:metabolism*
D005719:gamma-Globulins