Toxicity of Bread Wheat Lines Lacking Prolamins Encoded by theGli-B1/Gli-B5/Glu-B3andGli-D1/Glu-D3Loci in Coeliac Disease as Determined by their Agglutinating Activity
1996
De Vincenzi, Massimo | Dessì, Maria R. | Luchetti, Roberto | Pogna, Norberto | Redaelli, Rita | Galterio, Giovanni
Peptic-tryptic (PT) digests of alcohol-soluble proteins from the flour of three mutant lines of bread wheat, lacking γ-gliadins, γ-gliadins and low molecular-weight glutenin subunits encoded by the Gli-B1/Gli-B5/Glu-B3 loci (line S. Pastore 4A), the Gli-D1/Glu-D3 loci (line Alpe 1I-) or both groups of loci (line DM 22166), were compared with those of the normal cultivars S. Pastore and Alpe 1 I for their agglutinating activities on human myelogenous leukemia K562(S) cells, agglutination being strongly associated with toxicity for the coeliac intestine. All of the genotypes tested contained A-type α-gliadins, which constituted about 19% of the gliadins in the S. Pastore and Alpe 1I cultivars, 24.5% in the S. Pastore 4A and Alpe 1I null lines, and 34.8% in the double mutant line, DM 22166, as determined by densitometric scanning of their acid polyacrylamide gel electrophoresis patterns. The minimal concentrations of PT digest required to agglutinate 100% of K562(S) cells were 73mg/l and 96mg/l, in the S. Pastore and Alpe 1I cultivars, respectively, compared with 146mg/l, 138mg/l and 200mg/l in the “null” lines, S. Pastore 4A, Alpe 1 I-and DM 22166, respectively. The results indicated that proteins other than α-gliadins are involved in the gluten-sensitive enteropathy.
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