Person: ŞEN, ALİ
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ŞEN
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ALİ
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Publication Open Access In vitro investigation of antimicrobial, enzyme inhibitory and free radical scavenging activities of Inula salicina L.(2022-09-01) YILDIRIM, AYBENİZ; ŞEN, ALİ; ŞENKARDEŞ, İSMAİL; BİTİŞ, LEYLA; Yıldırım A., ŞEN A., HACIOĞLU M., BİRTEKSÖZ TAN A. S. , ŞENKARDEŞ İ., BİTİŞ L.In this study, in vitro biological activities and total phenol/flavonoid contents of methanol extract (ISM) and its hexane (ISH), chloroform (ISC), ethyl acetate (ISEA) and aqueous methanol (ISAM) fractions obtained from aerial parts of Inula salicina were investigated. ISEA showed the highest antioxidant activity against DPPH and ABTS radicals with an IC50 value of 0.014 mg ml-1 for both assays. ISEA exhibited a good anti-inflammatory activity with an IC50 value of 0.060 mg ml-1 . ISEA was found to exhibit a moderate level of antidiabetic activity against α amylase enzyme with an IC50 value of 0.290 mg ml-1 . ISEA and ISM presented low and moderate inhibitory activity against acetylcholinesterase and butyrylcholinesterase enzymes with IC50 values of 0.577 and 0.279 mg ml-1 , respectively. ISC with MIC values of 78 and 156 µg ml-1 displayed a significant antimicrobial activity against Staphylococcus aureus and S. epidermidis, respectively. Almost all extracts had moderate effect against Candida species. The highest total phenolic and flavonoid contents were determined in ISEA with 574.8 mg GAE (gallic acid equivalent) g -1 extract and 30.48 mg QE (quercetin equivalent) g -1 extract, respectively. These results showed that ISEA had a good antioxidant and anti-inflammatory activity with moderate α-amylase and butyrylcholinesterase inhibitory activity. Also, ISC exhibited a significant antimicrobial activity against Staphylococcus species.Publication Open Access Protective effects of Rubus tereticaulis leaves ethanol extract on rats with ulcerative colitis and bio-guided isolation of its active compounds: A combined in silico, in vitro and in vivo study(2022-11-01) ŞEN, ALİ; ÖZBEYLİ, DİLEK; ERTAŞ, BÜŞRA; DOĞAN, AHMET; BİTİŞ, LEYLA; Şen A., Özbeyli D., Teralı K., Göger F., Yıldırım A., Ertaş B., Doğan A., Bitiş L., Şener G.The aim of this study was to evaluate the therapeutic effect of active ethanol extract obtained from the leaves of Rubus tereticaulis (RTME) against colitis, and to purify major compounds from this extract by bioassay-directed isolation. Rats with colitis induced via intra-rectal acetic acid administration (5%, v/v) received RTME or sulfasalazine for three consecutive days. On day four, all rats were decapitated, and the colonic tissue samples were collected for macroscopic score, colon weight, reduced glutathione (GSH), myeloperoxidase (MPO), and malondialdehyde (MDA) analyses. The active compounds and chemical composition of RTME were determined by bio-guided isolation and LC-MS/MS, respectively. Compared to the colitis group, the rats treated with RTME displayed significantly lowered macroscopic scores and colon wet weights (p < 0.001). These effects were confirmed biochemically by a decrease in colonic MPO activity (p < 0.001), MDA levels (p < 0.001), and an increase in GSH levels (p < 0.001). Kaempferol-3-O-β-d-glucuronide (RT1) and quercetin-3-O-β-d-glucuronide (RT2) were found to be the major compounds of RTME, as evidenced by in vitro anti-inflammatory and antioxidant activity-guided isolation. Their anti-inflammatory/antioxidant activities were also predicted by docking simulations. Additionally, quinic acid, 5-caffeoylquinic acid, quercetin pentoside, quercetin glucoside, quercetin-3-O-β-d-glucuronide, kaempferol-3-O-β-d-glucuronide, and kaempferol rutinoside were identified in RTME via using LC-MS/MS. RT2, along with other compounds, may be responsible for the observed protective action of RTME against colitis. This study represents the first report on the beneficial effects of RTME in an experimental model of colitis and highlights the potential future use of RTME as a natural alternative to alleviate colitis.Publication Open Access Cotinus coggygria scop. Attenuates acetic acid-induced colitis in rats by regulation of inflammatory mediators(2023-03-01) ŞEN, ALİ; ERTAŞ, BÜŞRA; YILDIRIM, AYBENİZ; AKAKIN, DİLEK; BİTİŞ, LEYLA; ŞENER, GÖKSEL; Şen A., Ertaş B., Çevik Ö., Yıldırım A., Gökçeoğlu-Kayalı D., Akakın D., Bitiş L., Şener G.In traditional medicine, many medicinal plants are used in the treatment of various diseases caused by infammation. The objective of the present study is to elucidate for the frst time the efects of Cotinus coggygria (CC) ethanol extract (CCE) on colonic structure and infammation of acetic acid-induced ulcerative colitis in rats. Colonic damage was assessed using disease activity index score, enzyme-linked immunosorbent assay, and hematoxylin–eosin staining. Also, in vitro antioxidant activity of CCE was investigated by ABTS methods. Total phytochemical content of CCE was measured spectroscopically. Acetic acid caused colonic damage according to disease activity index and macroscopic scoring. CCE signifcantly reversed these damages. While the levels of proinfammatory cytokines TNFalpha, IL-1beta, IL-6, and TGF-1beta increased in tissue with UC, IL-10 level decreased. CCE increased infammatory cytokine levels to values close to the sham group. At the same time, while markers indicating disease severity such as VEGF, COX-2, PGE2, and 8-OHdG indicated the disease in the colitis group, these values returned to normal with CCE. Histological research results support biochemical analysis. CCE exhibited signifcant antioxidant against ABTS radical. Also, CCE was found to have a high content of total polyphenolic compounds. These fndings provide evidence that CCE might be beneft as a promising novel therapy in the treatment of UC in humans due to high polyphenol content and justify the use of CC in folkloric medicine for treatment of infamed diseases.