Abstract
The [mouse] immune response to .beta.-galactosidase (.beta.-D-galactoside galactohydrolase; EC 3.2.1.23) is characterized by a wave of early help followed by a wave of suppression to a subsequent in vitro challenge with galactosidase-fluorescein. A CNBr peptide of .beta.-galactosidase, CB2, mimics the suppression seen with the enzyme. It is time dependent, carrier specific and anti-.theta. sensitive; however, this suppression is not preceded by a wave of help. It is possible that CB2 cannot stimulate helpers, and is only able to activate suppressor cells. One small region of an antigen, capable of activating suppressors, can apparently nullify the positive effect induced in helper T [thymus-derived] cells reactive with other epitopes on .beta.-galactosidase. Key determinants on macromolecules may be influential in regulating the immune response to the entire antigen molecule.

This publication has 20 references indexed in Scilit: