Person: BİTİŞ, LEYLA
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BİTİŞ
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LEYLA
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Publication Metadata only İmhası istenilen ürünler(2015-12-01) CÜCÜ, AYŞEN; BİTİŞ, LEYLA; RAYAMAN, ERKAN; ŞAHBAZ, SEVİNÇ; AKGÜN ÖLMEZ, SEVCAN GÜL; Cücü A., Bitiş L., Rayaman E., Şahbaz S., Akgün Ölmez S. G.Publication Open Access Ethanol extract of Cotinus coggygria leaves accelerates wound healing process in diabetic rats(TAYLOR & FRANCIS LTD, 2016-11) ŞEN, ALİ; Aksoy, Halil; Sen, Ali; Sancar, Mesut; Sekerler, Turgut; Akakin, Dilek; Bitis, Leyla; Uras, Fikriye; Kultur, Sukran; Izzettin, Fikret VehbiContext:Cotinus coggygria Scop. (Anacardiaceae) leaves that were used as wound healing in traditional Balkan and Anatolian folk medicine, could be potentially effective in treating diabetic wounds.Objective: This study investigates biochemical and histological effects of ethanol extract of C. coggygria (CCE) on excision wound model in diabetic rats.Materials and methods: This study was conducted on diabetic Wistar albino rats, which were injected by a single dose (50mg/kg i.p.) streptozotocin. Afterward an excision wound model was created in all animals; diabetic control rats were applied topically simple ointment and diabetic treatment rats were applied topically 5% (w/w) ointment with CC, once a day during the experimental period. Malondialdehyde, glutathione and hydroxyproline levels in wound tissues were investigated at the end of 3rd, 7th, and 14th days. Histopathological examination was also performed.Results: Hydroxyproline content was significantly increased in the CCE treated group versus control after the 3rd and 7th days (15.33 versus 11.83; 19.67 versus 15.67mg/g, p<0.05; respectively). A statistically significant elevation in glutathione at the end of 3rd, 7th, and 14th days (5.13 versus 1.58, p<0.05; 4.72 versus 1.88, p<0.05; 3.83 versus 1.88mol/g, p<0.05, respectively) and a statistically significant decrease in malondialdehyde level at the end of 7th day (4.49 versus 1.48nmol/g, p<0.05) were determined in the treated group versus control group. These results were also supported by histological analyses.Discussion and conclusion: These findings indicate that CCE accelerated the cutaneous wound healing process in diabetic wounds, in confirmation of its traditional use.Publication Metadata only Chemical composition of endemic Stachys subnuda Montbret & Aucher ex Benth. essential oil and its anti-inflammatory and antioxidant activities(TAYLOR & FRANCIS INC, 2019) DOĞAN, AHMET; Sen, Ali; Kurkcuoglu, Mine; Bitis, Leyla; Dogan, Ahmet; Baser, Kemal Husnu CanThe essential oil of aerial parts of Stachys subnuda Montbret & Aucher ex Benth (S. subnuda) was analyzed by gas chromatography (GC) and GC/mass spectrometry (MS). Anti-inflammatory activity was evaluated by lipoxygenase inhibition assay. The antioxidant activity was determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azinobis-3-ethylbenzothiozoline-6-sulfonic acid (ABTS) assays. Sixty-two constituents, comprising 97.1% of the total essential oil composition, were identified. Phytol (25.2%), beta-caryophyllene (11.2%), germacrene D (6.9%), and hexadecanoic acid (6.9%) were the major compounds of aerial part essential oils of S. subnuda. The essential oil showed significant radical scavenging activity with 50% inhibition (IC50) values of 0.124 and 0.204 mg/mL for ABTS and DPPH radicals, respectively. The essential oil exhibited moderate anti-inflammatory activity with an IC50 value of 0.419 mg/mL. The results indicated that S. subnuda essential oil had good anti-inflammatory and antioxidant activity. Also, this is first study on chemical composition, anti-inflammatory and antioxidant activity of S. subnuda essential oil.Publication Metadata only Flavonoids and antioxidant activity of Rosa agrestis leaves(TAYLOR & FRANCIS LTD, 2010) BİTİŞ, LEYLA; Bitis, Leyla; Kultur, Sukran; Melikoglu, Gulay; Ozsoy, Nurten; Can, AyseIn this work we report the isolation and characterisation of seven flavonoids, the levels of total phenolics, flavonoids and proanthocyanidins, and the antioxidant activity of the leaf extract of Rosa agrestis Savi (Rosaceae). The results showed that the R. agrestis leaf extract exhibited significant antioxidative activity as measured by 2,2-diphenyl-1-picrylhydrazyl (DPPH) (EC50 = 47.4 mu g mL-1), inhibited both -carotene bleaching and deoxyribose degradation, quenched a chemically generated superoxide anion in vitro and showed high ferrous ion chelating activity. Reactivity towards 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt (ABTS) radical cation and ferric-reducing antioxidant power (FRAP) values were equivalent to 2.30 mM L-1 Trolox, the water soluble -tocopherol analogue, and 1.91 mM L-1 Fe2+, respectively. The high antioxidant activity of the extract appeared to be attributed to its high content of total phenolics, flavonoids and proanthocyanidins. The flavonoids isolated from R. agrestis leaves were diosmetin, kaempherol, quercetin, kaempherol 3-glucoside (astragalin), quercetin 3-rhamnoside (quercitrin), quercetin 3-xyloside and quercetin 3-galactoside (hyperoside). Diosmetin (5,7,3'-trihydroxy-4'-methoxyflavone) was isolated for the first time from Rosa species.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 Metadata only THERAPEUTIC POTENTIAL OF MYRTUS COMMUNIS SUBSP COMMUNIS EXTRACT AGAINST ACETIC ACID-INDUCED COLONIC INFLAMMATION IN RATS(WILEY, 2017) ŞEN, ALİ; Sen, Ali; Yuksel, Meral; Bulut, Gizem; Bitis, Leyla; Ercan, Feriha; Ozyilmaz-Yay, Nagehan; Akbulut, Ozben; Cobanoglu, Hamit; Ozkan, Sevil; Sener, GokselThe aim of this study was to evaluate the effect of ethanol extract from leaves of Myrtus communis subsp. communis (MC) on acetic acid (AA)-induced ulcerative colitis in rats. On the fourth day of colitis induction, all rats were decapitated. Colitis was assessed by macroscopic and microscopic scores and by measuring malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO) activity, luminol, lucigenin, nitric oxid and peroxynitrite chemiluminescence (CL). Colitis caused significant increases in the colonic MDA levels, MPO activity, CL values, macroscopic and microscopic damage scores along with significant decrease in tissue GSH level. However, treatment with MC extract reversed all these biochemical indices, as well as histopathological alterations induced by AA with the protective effects being similar to that of sulphasalazine treatment. The study showed that MC extract could alleviate colitis in rats and can be considered an alternative therapeutic approach for management of inflammatory bowel diseases (IBD).Publication Open Access The effects of Origanum onites in streptozotocin-induced diabetes mellitus in rats(2022-01-01) POLAT, ELİF BEYZANUR; TAŞKIN, TURGUT; BİTİŞ, LEYLA; ELÇİOĞLU, HATİCE KÜBRA; Aydemir O., Polat E. B. , Aljesri K., TAŞKIN T., BİTİŞ L., ELÇİOĞLU H. K.© 2022 Marmara University Press.Diabetes mellitus is a chronic disease characterized by decreased insulin synthesis and/or increased blood glucose due to insulin resistance. In this study, streptozotocin (STZ)-induced diabetic rats were evaluated and it was aimed to investigate the protective effects of Origanum onites L. (OO) against possible changes in these parameters. Male Sprague-Dawley rats weighing 300-400g were divided into three groups control (C), diabetes mellitus (DM) and diabetes mellitus + OO (OO group). DM was induced by administration of STZ 60 mg/kg dose intraperitoneally (i.p.) after 48 hours, rats with blood glucose values higher than 200 mg/dL were considered DM. Origanum extract was administered i.p. to the OO group at 50 mg/kg per day for 6 weeks. Serum AST, ALT, creatinine, and inflammatory cytokine levels were measured. MDA and GSH levels were measured in liver tissues. AST, ALT, creatinine, and MDA levels were found to be increased in the DM group, while a significant decrease in these levels was observed in the treated group. While GSH values fell in the DM group, a significant increase occurred in the OO group (n=6, p<0.0001; two-way ANOVA). When the plasma levels of cytokines were examined, an increase was observed in the DM group and a significant decrease was observed in the OO group. When we evaluate our findings, we think that OO has a protective effect against complications that may occur in DM by preventing oxidant damage and inflammation. Further studies are needed on the protective effects of OO in DM.Publication Open Access In vitro antiproliferative, antioxidant, anti-inflammatory activities and phenolic profile of Centaurea saligna ( K.Koch) Wagenitz(MARMARA UNIV, 2022) ŞEN, ALİ; Yildirim, Aybeniz; Sen, Ali; Goger, Fatih; Ozakpinar, Ozlem Bingol; Bitis, LeylaPublication Open Access Antioxidant and anti-inflammatory activities of Phlomis pungens and Coridothymus capitatus(MARMARA UNIV, FAC PHARMACY, 2018-01-12) YAVUZ, AYŞE NUR; Taskin, Turgut; Cam, Muhammet Emin; Bulut, Gizem; Hazar-Yavuz, Ayse Nur; Kabasakal, Levent; Bitis, LeylaThe purpose of this study was to comparatively reveal for the first time the antioxidant, anti-inflammatory effects of Phlomis pungens and Coridothymus capitatus methanol extracts obtained by using maceration extraction method. According to the results of anti-inflammatory activity, P. pungens methanolic extract demonstrated a more prominent and intensive antiinflammatory effect with 24.7% of inhibitive capacity in the altered edema size after the first hour of carrageenan injection compared to C. capitatus methanolic extract. P. pungens methanolic extract inhibitory effect increased during three hours and reached maximum by 41.9%. According to the results obtained from antioxidant activity experiments, methanol extract of C. capitatus exhibited stronger free radical scavenging (DPPH), cupric reducing (CUPRAC), ferric reducing/antioxidant power (FRAP) and ABTS radical cation scavenging activity than P. pungens extract. In additon, C. capitatus extract had higher ABTS radical cation scavenging and ferric reducing/antioxidant power activity than ascorbic acid, BHT and BHA, respectively. Therefore, this extract can be used in both medicine and food industry as a natural antioxidant source.Publication Metadata only Alkaloids from the aerial parts of Consolida anthoroidea and Delphinium linearilobum(SPRINGER, 2009) BİTİŞ, LEYLA; Suzgec, S.; Bitis, L.; Sozer, U.; Ozcelik, H.; Zapp, J.; Kiemer, A. K.; Mericli, F.; Mericli, A. H.
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