Add time:08/09/2019         Source:sciencedirect.com

2-hydroxyheptanal (cas 17046-02-5) (2-HH) is one of the reactive aldehyde species generated during the peroxidation of n−6 polyunsaturated fatty acids, such as linoleic and arachidonic acids. Analogous to the Maillard reaction of reducing sugars, 2-HH readily reacts with lysine ε-amino groups. In the present study, to define the occurrence of the Maillard reaction-like lysine modification by 2-HH in vivo, we raised a monoclonal antibody directed to a trihydropyridinone (THPO) structure, 1-alkyl-4-butyl-5-pentyl-1,2,6-trihydropyridin-3-one, formed from 2-HH and lysine, and examined the presence of the antigenic structure in the human atherosclerotic aorta. Mice were immunized with the 2-HH-modified keyhole limpet hemocyanin (KLH) as the immunogen. Using a THPO–carrier protein conjugate, we screened the hybridomas and finally obtained a clone that produced the monoclonal antibody 3C8 (mAb3C8). The antibody strongly recognized bovine serum albumin (BSA) treated with 2-HH, but showed no cross-reactivity with BSAs modified with other related aldehydes. By using this antibody, it was revealed that the antigenic structure was indeed present in atherosclerotic lesions of the human aorta.

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