The immune response to the synthetic amino acid terpolymer (L-glutamic acid55 L-lysine33 L-tyrosine15)n (GLT) was studied in normal human volunteers. Delayed skin test reactivity to this antigen was seen in 34 of 61 subjects immunized with 150 μg of GLT. No antibody to GLT was detected in these responding individuals. There was a close correlation between the in vivo skin reactivity of volunteers to GLT and the ability of their lymphocytes to produce migration inhibitory factor (MIF) in response to GLT in vitro. However, a similar correlation was not seen when the in vitro proliferative response of lymphocytes to GLT, as measured by [methyl-3H] thymidine ([3H]TdR) incorporation, was assayed.HL-A typing of volunteers was studied to determine if responsiveness to GLT was correlated to HL-A type. No statistical association was seen after correction was made for the number of individual HL-A antigens.
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