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Adler, K.* ; Mueller, D.B.* ; Achenbach, P.* ; Krause, S.* ; Heninger, A.K.* ; Ziegler, A.-G.* ; Bonifacio, E.*

Insulin autoantibodies with high affinity to the bovine milk protein alpha casein.

Clin. Exp. Immunol. 164, 42-49 (2011)
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Insulin autoantibodies (IAA) can appear in children within months of introducing solid foods to the diet and before clinical type 1 diabetes. The aim of this study was to determine whether infant dietary antigens could be immunizing agents of IAA. To this end, IAA binding to [(125) I]insulin was competed with food preparations and extracts of foods encountered in the infant diet (milk formulas, bovine milk, wheat flour, fowl meal). Bovine milk powder extracts inhibited IAA-positive samples from six of 53 children (age 0·3-14·0 years) participating in German prospective cohorts. Inhibition in these sera ranged from 23 to 100%. Competition was abolished when hydrolyzed milk powder was used. Competition with protein components of bovine milk found that two of the six milk-reactive sera were inhibited strongly by alpha- and beta-casein; none were inhibited by the milk proteins bovine serum albumin or lactoglobulins. The two casein-reactive sera had high affinity to alpha-casein (1·7×10(9) ; 3·1×10(9)  l/mol), and lesser affinity to beta-casein (4·0×10(8) ; 7·0×10(7)  l/mol) and insulin (2·6×10(8) ; 1·6×10(8)  l/mol). No children with milk-reactive IAA developed autoantibodies to other islet autoantigens or diabetes (median follow-up 9·8 years). These results suggest that autoimmunity to insulin can occur infrequently via cross-reactivity to food proteins, but this form of IAA immunization does not appear to be associated with progression to diabetes.
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Publication type Article: Journal article
Document type Scientific Article
Reviewing status
Institute(s) Institute of Diabetes Research Type 1 (IDF)
Institute of Diabetes and Obesity (IDO)
Institute for Pancreatic Beta Cell Research (IPI)