Diabetes Care, Vol 20, Issue 9 1357-1359, Copyright © 1997 by American Diabetes Association
Lispro analog for treatment of generalized allergy to human insulin
D Kumar
Department of Medicine, University of Southern California School of Medicine, Los Angeles County Medical Center, USA.
OBJECTIVE: To evaluate the clinical usefulness of the human insulin analog
lispro in a patient with generalized allergy to human insulin. RESEARCH
DESIGN AND METHODS: A 34-year-old obese female patient developed systemic
allergic reactions to human insulin but tolerated insulin lispro.
Sequential analyses of the anti-insulin IgE and IgG immunoglobulins were
performed. RESULTS: On intradermal test, the lispro insulin produced a 50%
less intense wheal-flare response, compared with human insulin, which was
presumed to be due to lispro's molecular form. The intradermal reactivity
to both human and lispro insulins decreased with time and disappeared by
week 25. 125I-labeled lispro and human insulin binding antibody titers of
both the IgE and IgG immunoglobulins were high initially, but decreased
progressively, becoming very low by the end of 1 year. In in vitro
immunoassay, the lispro and human insulins show a complete
cross-reactivity. CONCLUSIONS: Lispro may be useful for the management of
allergy to human insulin. This analog of human insulin appears to have a
reduced immunogenic potency.