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    Fructose-derived glycation and immune function: Effects on antigen binding in human IgG and lymphocytes
    (Elsevier Science Inc, 2025) Akay, Feryal; Inceoren, Nesrin; Nas, Cemal; Yokus, Beran; Kizil, Goksel; Kizil, Murat
    Diabetes Mellitus (DM), one of the oldest known metabolic disorders, dates back to 3000 BC and continues to have a profound impact on health and the economy. Nutrition plays a critical role in managing diabetes and enhancing overall quality of life. It is also vital for immune system function, as well as in the prevention and treatment of aging-related diseases. A key factor contributing to the global rise in obesity is the excessive consumption of fructose/glucose (corn) syrup, which leads to various metabolic complications. Uncontrolled intake of carbohydrates, particularly sugars like fructose, triggers the Maillard Reaction, a chemical process that occurs between sugars and proteins, resulting in advanced glycation end-products (AGEs). This process is accelerated in diabetic patients due to hyperglycemia, leading to increased glycation of plasma proteins such as immunoglobulins, which play an essential role in the immune system. Studies show that individuals with Diabetes Mellitus experience a higher susceptibility to infections due to increased viral entry, impaired immune responses, reduced viral clearance, and dysregulated inflammatory cytokine production. In this study, human IgG proteins were glycated in vitro using fructose, simulating the damaging effects seen in diabetic conditions. A mixture containing antioxidants like glutathione, oleuropein, and selenium was prepared and incubated with the glycated IgG to assess its protective properties. Lymphocyte cells from healthy volunteers were also treated with fructose and subjected to similar experiments. Results demonstrated that fructose significantly compromises immune function by damaging key proteins, but the antioxidant mixture effectively mitigates this damage, offering a protective mechanism against glycation in the immune system.
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    In vitro inhibition of advanced glycation end product formation by ethanol extract of milk thistle (Silybum marianum L.) seed
    (Elsevier, 2022) Inceoren, Nesrin; Emen, Sevil; Toptanci, Bircan Ceken; Kizil, Goksel; Kizil, Murat
    Glycation of proteins by reducing sugars produces toxic and immunogenic compounds called advanced gly-cation end products (AGEs). AGEs plays important role in the progression of typical diabetes complications. Silybum marianum L. contains powerful antioxidants that quench free radicals, which are unstable and reac-tive compounds that damage DNA and cellular structures. This study aimed to evaluate the antioxidant activ-ities and the inhibitory effects of ethanol:water (1:1) extract of the Silybum marianum seed (SlyE) and silymarin (Sly) on fructose mediated protein glycation and AGE formation. The total amount of silymarin in SlyE was found to be 2.59 mg/gDW by HPLC. The composition of phenolic in the extract was found to be 262.70 mg gallic acid (GAE)/mg extract. The composition of flavonoids in the extract was found to be 10.50 mg quercetin (QUE)/mg extract. The seed exhibited ABTS radical cation decolourization inhibition with 70.4% at 300 mg concentration. Ferric reducing power of the extract was also evaluated. The SlyE and Sly also demonstrated strong inhibitory effects on the production AGEs in bovine serum albumin (BSA)/fructose model. SlyE and Sly has a significant effect in preventing oxidative protein damage, including the effect on the formation of fructosamines, a-dicarbonyls and protein carbonyl content (PCC). SlyE and Sly were able to prevent the glycoxidative damage of BSA. It can be concluded that the SlyE has antiglycating potential as well as antioxidant properties. (C) 2022 SAAB. Published by Elsevier B.V. All rights reserved.