The invention discloses a linear 33
peptide molecule which consists of a B
epitope (10
peptide) of human
dipeptidyl peptidase 4 and 23
peptide containing a Th2
epitope; serum of an animal immunized by33 peptide contains an
antibody which has high price and can be specifically combined with DPP4; the
antibody can inhibit the activity of the DPP4 and regulate immune rebalance trending to Th2; the 33 peptide is utilized to carry out subcutaneous immunological control or treat type 1 diabetic NOD mice and treat STZ-induced diabetic mice every 2 weeks, so that blood glucose is significantly controlled or reversed; the blood glucoses of the NOD mice are basically normal, GLP-1 and Th2 cytokines are significantly increased and
glucagon and Th1 cytokines are significantly reduced, so that morbidity, death rate, multiple immune balances as well as
uric acid,
creatinine, blood lipid and
oxidative stress indicators are remarkably improved, pancreatic
inflammation is relieved, and the ability ofpancreas secreting
insulin is significantly strengthened. The 33 peptide as well as vaccines and drugs prepared by using microorganisms, animals, plants and
cell expression based on the 33 peptide areof great value in preventing and treating diabetes, especially in type 1 diabetes and complications and other diseases.