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DEMİREL, METİN

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METİN
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DEMİREL
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    PublicationOpen Access
    Could the PON1 phenotype play a key role in insulin resistance?
    (2022-06-01T00:00:00Z) Sarikaya, Ufuk; Meydan, Sedat; Selek, Şahabettin; Sarikaya, Alime; Demirel, Metin; Gül, Ayşe Zehra; Yildiz, Tuğçe; SARIKAYA, UFUK; MEYDAN, SEDAT; SELEK, ŞAHABETTİN; DEMİREL, METİN; GÜL, AYŞE ZEHRA; YILDIZ, TUĞÇE
    Aim/objectivesRecent studies have shown that Paraoxonase (PON1) enzyme plays a possible role in insulin synthesis by stimulating insulin release from β-cells of the pancreas as well as its anti-atherosclerotic property. In our study, we revealed the relationship between phenotypes of the PON1 enzyme and insulin resistance (IR) and impaired fasting glucose (IFG).Materials and methodsA cohort of 71 IR, 63 IFG, and 68 healthy individuals was examined in this study. The phenotypic distribution was demonstrated by studying PON1 enzyme’s Paraoxonase (POase) and Arylesterase (AREase) activity with automated measurement kits.ResultsBy measuring the ratio of POase activity to AREase activity, 3 different phenotypes (QQ (Risky or Bad Phenotype), QR (Notre Phenotype), and RR (Good Phenotype)) were discovered. The results showed that IR and IFG individuals had riskier phenotypes compared to the control group. In addition, individuals with bad phenotypes were found to be 1.85 and 2.16 times more likely to get IR and IFG, respectively. Both groups were found to be four times more likely to be affected by the bad phenotype (odds ratio: 3.69 and 4.47 respectively).ConclusionIn this present study, the relationship between PON1 enzyme phenotypes and IR was evaluated for the first time in this field. Decreased PON1 activity and poor phenotype may also increase the development of hyperglycemia or diabetes mellitus (DM) due to IR and IFG. It may also predispose to diseases such as atherosclerosis. Therefore, we think that further investigations to explain the possible mechanisms underlying the relationship between PON1 phenotypes, IR and IFG will be useful in the early diagnosis and prevention ofprediabetes.
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    PublicationOpen Access
    Mass spectrometry-based untargeted metabolomics study of non-obese individuals with non-alcoholic fatty liver disease
    (2023-06-01) Demirel M.; Köktaşoğlu F.; Özkan E.; Dulun Ağaç H.; Gül A. Z.; Sharifov R.; Sarıkaya U.; Başaranoğlu M.; Selek Ş.; DEMİREL, METİN; KÖKTAŞOĞLU, FATMANUR; DULUN AĞAÇ, HALİME; GÜL, AYŞE ZEHRA; SARIKAYA, UFUK; BAŞARANOĞLU, METİN; SELEK, ŞAHABETTİN
    Objectives: Non-alcoholic fatty liver disease (NAFLD) is a disease characterized by the accumulation of excessive fat in the liver, which can lead to fibrosis and has an increasing prevalence. NAFLD requires non-invasive diagnostic biomarkers. While typically observed in overweight individuals, it can also occur in non-obese/non-overweight individuals. Comparative studies on non-obese NAFLD patients are scarce. This study aimed to conduct a using liquid chromatography-high resolution mass spectrometry (LC-MS/MS)-based metabolic profiling of non-obese NAFLD patients and healthy controls. Materials and methods: The patient group consisted of 27 individuals with NAFLD, while the healthy control group included 39 individuals. Both groups were between 18 and 40 years old, had a BMI of less than 25 and had alcohol consumption less than 20 g/week for men and 10 g/week for women. Serum samples were collected and analyzed using LC-MS/MS. The data were analyzed using the TidyMass and MetaboAnalyst. Results: The LC-MS/MS analyses detected significant changes in D-amino acid metabolism, vitamin B6 metabolism, apoptosis, mTOR signaling pathway, lysine degradation, and phenylalanine metabolism pathways in non-obese NAFLD patients. Significant changes were also observed in the metabolites D-pantothenic acid, hypoxanthine, citric acid, citramalic acid, L-phenylalanine, glutamine, and histamine-trifluoromethyl-toluidide, β-hydroxymyristic acid, DL-Lactic acid, and 3-methyl-2-oxopentanoic. Overall, the study provides valuable insights into the metabolic changes associated with non-obese NAFLD patients and can contribute to the development of non-invasive diagnostic biomarkers for NAFLD.
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    PublicationOpen Access
    Effect of Camellia sinensis, Hypericum perforatum and Urtica dioica on kidney and liver injury induced by carbon tetrachloride in rats.
    (2019-06-30) Demirel, METİN; Meydan, SEDAT; Caglar, HG; Koktasoglu, F; Selek, ŞAHBETTİN; Sarikaya, A; SELEK, ŞAHABETTİN; KÖKTAŞOĞLU, FATMANUR; DEMİREL, METİN; MEYDAN, SEDAT