Abstract
Repeated injections of monoclonal antibody (mAb) culture supernatants into rat footpads increased the weights of the draining lymph nodes. Immunostained freeze sections showed that injection of MRC OX2, a mAb reacting with rat follicular dendritic cells and MRC OX7 (anti-Thy-1.1), led to gross hypertrophy primarily of the follicular areas, whereas MRC OX6 (anti-rat major histocompatibility complex class II molecules) resulted in selective stimulation of the paracortex. These findings indicate that mAb, when conjugated to certain antigens, would modulate the immune response to these antigens. Consequently, the mAb were conjugated with fluorescein isothiocyanate (FITC) and the humoral response against the hapten measured. The primary anti-FITC antibody response was tenfold stronger than after stimulation with FITC conjugated to a conventional carrier such as ovalbumin, and had some characteristics of a secondary response: a fast increase of IgG level to very high titers and a long duration without further amplification at later antigen challenges.
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