The affinity and spectrum of cross reactivity of antibody production in senescent mice: the IgM response - PubMed (original) (raw)
The affinity and spectrum of cross reactivity of antibody production in senescent mice: the IgM response
D Zharhary et al. Mech Ageing Dev. 1977 Sep-Oct.
Abstract
Experiments were performed to determine whether the IgM component of the primary humoral immune response of senescent mice differs from that of young-adult mice in its affinity, specificity or heterogeneity. For this purpose, mice were immunized with the T-dependent antigen, TNP-KLH, or the T-independent antigen, TNP-LPS. Affinity and specificity of the anti-TNP response were studied at the cellular level by the plaque inhibition technique using the cross-reacting haptens TNP-epsilon-aminocaproic acid )TNP-EACA),DNP-EACA and ONP-EACA. It was found that when the immunogen was TNP-KLH, the peak IgM response was delayed in senescent animals by several days as compared to the response in young adults. However, the number of PFC on the day of peak response was comparable. No age related delay in the peak of response was detected when the antigen was TNP-LPS although the magnitude of response was reduced in old age. The average affinity of the plaque forming cell responses to both immunogens is comparable in young and old mice.
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