VESICLE INTERACTIONS WITH ANTIBODY AND PEPTIDE HORMONE - ROLE OF VESICLE COMPOSITION

  • 1 January 1976
    • journal article
    • research article
    • Vol. 17  (12) , 1073-1076
Abstract
Artificial lipid vesicles (artificial membranes) bind human 125I-antithyroglobulin (anti-Tg) and human 125I-thyrotropin. Vesicles made with gangliosides bound more antibody and hormone than vesicles lacking them. These gangliosides contained a variety of carbohydrates including glucose, galactose, N-acetyl-galactosamine and sialic acid. The in vivo stability of antibody-vesicle complexes was a function of vesicle composition: vesicles were most stable when formed from phosphatidylcholine, cholesterol and gangliosides. Anti-Tg-vesicle complexes bind to thyroglobulin, indicating that at least some of the antibody associated with the vesicle still retains ability to bind to its specific antigen. The addition of a specific antibody or hormone to artificial lipid vesicles may serve as a mechanism to confer specificity to the vesicle in vivo.

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