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    Moringa oleifera ameliorates oxidative damage caused by sodium valproate in the small intestine
    (Taylor & Francis Ltd, 2026) Coremen, Melis; Ertik, Onur; Magaji, Umar Faruk; Sacan, Ozlem; Bulan, Omur Karabulut; Yanardag, Refiye
    This study aimed to investigate the protective effects of Moringa oleifera (MO) extract against valproic acid (VPA)-induced small intestine damage in rats. Forty-six adult female Sprague-Dawley rats were divided into four groups: Control (saline), MO (300 mg/kg), VPA (500 mg/kg), and VPA + MO. All treatments were administered orally for 15 days. Biochemical oxidative stress analyses revealed that MO treatment mitigated oxidative stress in VPA-treated rats. Molecular docking studies demonstrated that bioactive compounds in MO leaves exhibited potential inhibitory activity against oxidative stress-related enzymes, with high binding affinities. Immunohistochemical results indicated that VPA did not alter antioxidant stress responses such as Nrf2. However, histological examinations showed that VPA caused structural damage to the small intestine, while MO treatment alleviated this effect. Overall, MO exhibited significant protective and antioxidant properties against VPA-induced intestinal injury.
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    Reduction of oxidative damage in prostate tissue caused by radiation and/or chloroquine by apocynin
    (Taylor & Francis Ltd, 2024) Ertik, Onur; Us, Ayca Sezen; Gul, Ilknur Bugan; Us, Huseyin; Coremen, Melis; Bulan, Omur Karabulut; Yanardag, Refiye
    Prostate damage can occur in men due to age and genetic factors, especially when exposed to external factors. Radiation (RAD) is a prominent factor leading to oxidative stress and potential prostate damage. Additionally, chloroquine (CQ), used in malaria treatment, can induce oxidative stress in a dose-dependent manner. Therefore, reducing and preventing oxidative damage in prostate tissue caused by external factors is crucial. Rats used in the study were divided into seven groups, CQ, apocynin (APO), RAD, CQ + APO, CQ + RAD, APO + RAD, CQ + APO + RAD. Subsequently, in vivo biochemical parameters of prostate tissues were examined, including reduced glutathione, lipid peroxidation, superoxide dismutase, glutathione reductase, glutathione peroxidase, glutathione-S-transferase activities, and total antioxidant status, total oxidant status, reactive oxygen species, oxidative stress index, advanced oxidation protein products and histologically. The in vivo results presented in our study showed that APO reduced oxidative stress and had a protective effect on prostate tissue in the CQ, RAD, and CQ + RAD groups as a results of biochemical and histological experiments. Additionally, in silico studies revealed a higher binding affinity of diapocynin to target proteins compared to APO. As a histological results, RAD and CQ alone or in combination did not induce damage in prostate tissues, whereas mild histopathological findings such as hyperemia and haemorrhage were observed in all APO-treated groups. The results suggest that the use of APO for the treatment of oxidative damage induced by CQ and RAD in rats. The biochemical and histological experiments showed that apocynin (APO) has reducing effects of oxidative stress in prostate tissue caused by radiation and radiation + chloroquine.In silico models presented to possible inhibitory effects of APO for enzymes which are reason to the production of free radical.
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    The metformin administration on pancreatic tissue damage in metastatic rat prostate cancer and STZ induced diabetes model
    (Springer, 2025) Koroglu, Pinar; Ertik, Onur; Bulan, Omur Karabulut; Yanardag, R.
    Cancer is the major cause of mortality in most nations, and a severe health problem worldwide. According to epidemiological studies, diabetes shows an increased risk for a variety of cancers. Metformin is a semisynthetic biguanide produced from the French lilac plant. The effects of metformin on pancreatic tissue damage in cancer and diabetic rat models were evaluated histologically and biochemically in the present study. The diabetes model was induced in Copenhagen rats using a single dose of streptozotocin, while prostate cancer was induced through subcutaneous inoculation of MAT-LyLu cells into the animals. Metformin was administered by gavage daily after inoculation of the Mat-Lylu cells. Histological evaluation showed moderate to severe damage to the pancreas following diabetes and cancer process. Administration of metformin reversed these effects showing a beneficial effect of metformin. Metformin treatment can be considered an adjuvant candidate for pancreas tissue in diabetes, prostate cancer and cancer therapy related damage. Metformin alleviates diabetes and cancer induced pancreatic cytotoxicity by regulating oxidative stress and antioxidant capacity. More research will be needed to explore the metformin effect.