CHST3 and Insulin resistance: However, we noticed the positive correlation between PC and AOPP concentration in the parotid glands and plasma HOMA-IR of the HSD group, which suggests that only the level of parotid protein peroxidation products increases as a function of insulin resistance while parotid lipid peroxidation, 8-OHdG, the submandibular lipid, and protein peroxidation products are independent of insulin sensitivity.