30 results on '"Özkan, Naziye"'
Search Results
2. Combination therapy with chitosan/siRNA nanoplexes targeting PDGF‐D and PDGFR‐β reveals anticancer effect in breast cancer
- Author
-
Şalva, Emine, primary, Özbaş, Suna, additional, Alan, Saadet, additional, Özkan, Naziye, additional, Ekentok‐Atıcı, Ceyda, additional, Kabasakal, Levent, additional, and Akbuğa, Jülide, additional
- Published
- 2022
- Full Text
- View/download PDF
3. Obestatin improves ischemia/reperfusion-induced renal injury in rats via its antioxidant and anti-apoptotic effects: Role of the nitric oxide
- Author
-
Koç, Mehmet, Kumral, Zarife Nigâr Özdemir, Özkan, Naziye, Memi, Gülsün, Kaçar, Ömer, Bilsel, Serpil, Çetinel, Şule, and Yeğen, Berrak Ç.
- Published
- 2014
- Full Text
- View/download PDF
4. Investigation of the Therapeutic Efficacy of Codelivery of psiRNA–Vascular Endothelial Growth Factor and pIL-4 into Chitosan Nanoparticles in the Breast Tumor Model
- Author
-
Şalva, Emine, Turan, Suna O., Kabasakal, Levent, Alan, Saadet, Özkan, Naziye, Eren, Fatih, and Akbuğa, Jülide
- Published
- 2014
- Full Text
- View/download PDF
5. The antifibrotic drug halofuginone reduces ischemia/reperfusion-induced oxidative renal damage in rats
- Author
-
Karadeniz Cerit, Kıvılcım, Karakoyun, Berna, Yüksel, Meral, Özkan, Naziye, Çetinel, Şule, Tolga Dağli, E., Yeğen, Berrak Ç., and Tuğtepe, Halil
- Published
- 2013
- Full Text
- View/download PDF
6. Effects of different exercise models on parkinson's disease model on cognitive function and the underlying mechanism
- Author
-
Koyuncuoğlu, Türkan, Erol, Gökçe, Çulpan, Yekta, Gülhan, Rezzan, Yüksel, Meral, Özkan, Naziye, Çakır, Özgür Kasımay, and Tıp Fakültesi
- Abstract
[No abstract avaiable]
- Published
- 2022
7. A study comparing the effects of rosiglitazone and/or insulin treatments on streptozotocin induced diabetic (type I diabetes) rat aorta and cavernous tissues
- Author
-
Elçioğlu, H. Kübra, Kabasakal, Levent, Özkan, Naziye, Çelikel, Çiğdem, and Ayanoğlu-Dülger, Gül
- Published
- 2011
- Full Text
- View/download PDF
8. Combination therapy with chitosan/siRNA nanoplexes targeting PDGF‐D and PDGFR‐β reveals anticancer effect in breast cancer.
- Author
-
Şalva, Emine, Özbaş, Suna, Alan, Saadet, Özkan, Naziye, Ekentok‐Atıcı, Ceyda, Kabasakal, Levent, and Akbuğa, Jülide
- Abstract
Background: Platelet derived growth factors (PDGF)‐D and the expression of its receptor increase in neoplastic progression of cancer. Co‐silencing of growth factor and receptor can be suggested as an important strategy for effective cancer therapy. In the present study, we hypothesized that suppression of PDGF‐D signaling pathway with small interfering RNAs (siRNAs) targeting both PDGF‐D and PDGF receptor (PDGFR)‐β is a promising strategy for anticancer therapy. Methods: Chitosan nanoplexes containing dual and single siRNA were prepared at different weight ratios and controlled by gel retardation assay. Characterization, cellular uptake, gene silencing and invasion studies were performed. The effect of nanoplexes on breast tumor growth, PDGF expression and apoptosis was investigated. Results: We have shown that downregulation of PDGF‐D and PDGFR‐β with chitosan/siRNA nanoplex formulations reduced proliferation and invasion in breast cancer cells. In the in vivo breast tumor model, it was determined that the intratumoral administration of chitosan/siPDGF‐D/siPDGFR‐β nanoplexes markedly decreased the tumor volume and PDGF‐D and PDGFR‐β mRNA and protein expression levels and increased apoptosis. Conclusions: According to the results obtained, we evaluated the effect of PDGF‐D and PDGFR‐β on breast tumor development and showed that RNAi‐mediated inhibition of this pathway formulated with chitosan nanoplexes can be considered as a new breast cancer therapy strategy. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
9. THE ROLE OF BOTULINUM TOXIN TYPE A-INDUCED MOTOR ENDPLATES AFTER PERIPHERAL NERVE REPAIR
- Author
-
AKDENIZ, ZEYNEP D., BAYRAMIÇLI, MEHMET, ATEŞ, FILIZ, ÖZKAN, NAZIYE, YUCESOY, CAN A., and ERCAN, FERIHA
- Published
- 2015
- Full Text
- View/download PDF
10. Protective effects of spironolactone against hepatic ischemia/reperfusion injury in rats
- Author
-
Atalay, Süleyman, primary, Soylu, Belkıs, additional, Aykaç, Aslı, additional, Velioğlu Öğünç, Ayliz, additional, Çetinel, Şule, additional, Özkan, Naziye, additional, Erzik, Can, additional, and Şehirli, Ahmet Özer, additional
- Published
- 2019
- Full Text
- View/download PDF
11. The Effects of Spironolactone in Preventing Bile Duct Ligation-induced Hepatitis in A Rat Model.
- Author
-
Şehirli, Ahmet Özer, Kökeş, Azime, Velioğlu-Öğünç, Ayliz, Tetik, Şermin, Özkan, Naziye, Çetinel, Şule, Sayıner, Serkan, and Dülger, Gül
- Subjects
BILE ducts ,PREGNANE X receptor ,ANIMAL disease models ,SPIRONOLACTONE ,HEPATITIS ,INTRAHEPATIC bile ducts ,ENTEROHEPATIC circulation ,LIVER cells - Abstract
Cholestasis is associated with the accumulation of bile acids and bilirubin in the hepatocytes and leads to liver injury. Pregnane X Receptor (PXR) coordinates protective hepatic responses to toxic stimuli, and this receptor was reported to stimulate bile secretion by increasing MRP2 expression. Since PXR activators were reported to be anti-inflammatory in the liver, PXR was proposed as a drug target for the treatment of chronic inflammatory liver diseases. We investigated the potential protective effect of spironolactone (SPL), an enzyme inducer, in hepatotoxicity induced by bile duct ligation in rats. Wistar Albino (250-300 g) rats were divided into the control group and the bile duct ligated (BDL) group. BDL group was divided into three subgroups; following BDL, for 3 days, the first group received propylene glycol (vehicle of SPL) (blinded), the second subgroup received spironolactone (SPL) (200 mg/kg oral), and the third subgroup received SPL for 3 days, starting 3 days after the bile duct ligation, in order to investigate if it has a healing effect after hepatitis had developed. The control group was sham-operated and received saline. At the end of the experiment, blood and tissue samples were collected. Serum TNF-a, NFĸB, bilirubin, IL-6 levels, ALT, AST, ALP activities and tissue MPO activity and oxidant damage increased after the bile duct ligation was significantly decreased following SPL administration. PXR and MRP2 activity showed an increase in the hepatocytes as a result of the treatment. In conclusion, it was observed that SPL administration significantly decreases liver inflammation and damage related to BDL. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
12. Uluslararası Katılımlı – 4. Ulusal Sağlık Hizmetleri Meslek Yüksekokulları Sempozyumu Raporu
- Author
-
Özkan, Naziye, Güçlü, Hülya, and Yüksel, Meral
- Subjects
Sağlık Hizmetleri Meslek Yüksekokulu,Sempozyum ,Health Care Sciences and Services ,Vocational School of Health Related Services,symposium ,Sağlık Bilimleri ve Hizmetleri - Abstract
This report refers to the content of the 4th National Symposium ofVocational Schools of Health Related Services. The symposiumwas organized by Marmara University, Vocational School of HealthRelated Services in Istanbul after nine years. The symposium wasfocused on educational problems in Vocational Schools of HealthRelated Services, solution proposals, employment problems,patient and employee safety, curriculum studies, and developmentsin clinical skills training. Apart from presenting on different topics,numerous posters and oral presentations were included in thesymposium program., Bu raporda, 4.Ulusal Sağlık Hizmetleri Meslek YüksekokullarıSempozyumu’nun içeriğine değinilmiştir. Dokuz yıl aradansonra İstanbul’da Marmara Üniversitesi Sağlık HizmetleriMeslek Yüksekokulu tarafından düzenlenen sempozyum, SağlıkHizmetleri Meslek Yüksekokullarının sorunları, çözüm önerileri,istihdam sorunları, hasta ve çalışan güvenliği, müfredat çalışmaları,klinik beceri eğitimlerindeki gelişmeler üzerine odaklanmıştır.Farklı konularda sunulan konferanslar dışında çok sayıda posterve sözlü bildiriler sempozyum programında yer almıştır.
- Published
- 2017
13. The Effect of Apelin on Podocytes in Doxorubicin Induced Nephrotic Syndrome
- Author
-
Özkan, Naziye, SEHIRLI, AHMET OZER, Yüksel, Meral, Çilingir, Özlem Tuğçe, TOK, OLGU ENİS, Aydemir, Sezgin, Koç, Mehmet, CETINEL, SULE, and TOK, OLGU ENİS
- Subjects
Özkan N., SEHIRLI A. O. , Yüksel M., Çilingir Ö. T. , TOK O. E. , Aydemir S., Koç M., CETINEL S., -The Effect of Apelin on Podocytes in Doxorubicin Induced Nephrotic Syndrome.-, International Congress of Histochemistry and Cytochemistry (ICHC 2017), Antalya, Türkiye, 18 May 2017, ss.445 - Published
- 2017
14. Histomorphological Changes of Apelin Treatment in Renal Tissue in Doxorubicin-induced Nephrotic Syndrome Model
- Author
-
Özkan, Naziye, Şehirli, Ahmet Özer, Koç, Mehmet, and Çetinel, Şule
- Subjects
Glomerül,tübül,doksorubisin,nefrotik sendrom,apelin ,urologic and male genital diseases - Abstract
Objective: Nephrotic syndrome (NS) may result in renal failure. Apelin (AP), a vasoactive peptide, demonstrates its effect by binding to the AP receptor. AP, present in the endothelial and vascular smooth muscle cells of glomerular arterioles, affects the pre- and post-microvascularization by regulating renal hemodynamics. This study aimed to determine the histomorphological changes of AP treatment in a doxorubicin (DOX)-induced NS model.Methods: Male Sprague Dawley rats were used. Rats were randomly divided into four groups (n=6): control [physiological saline (PS) solution intraperitoneal (i.p.)]; AP+PS (PS and 50 mcg/kg/day AP-13 i.p.); NS [10 mg/kg DOX i.p.] and NS+AP (NSAP; 10 mg/kg DOX+50 mcg/kg/day AP-13 i.p.). Renal tissues were collected on the 22nd day for light microscopic investigations.Results: Light microscopic investigations showed that the NS group revealed adhesions between the tuft and Bowman’s capsule, mesangial matrix accumulation in the glomeruli, and tubular damage with dilatation and cast accumulation. In the NSAP group, minimal regression in the glomerular and tubular damage was observed.Conclusion: The histomorphological changes of AP treatment in a DOX-induced NS model demonstrated a limited therapeutic effect on glomerular and tubular damage in renal tissues., Amaç: Nefrotik sendrom, böbrek yetmezliğine ilerleyebilen bir hastalıktır. Bir vazoaktif peptid olan apelin, etkisini apelin reseptörüne (APJ) bağlanarak gösterir. Glomerüler arteriollerin endotelyal ve vasküler düz kas hücrelerinde bulunan apelinin, böbrek hemodinamiğini düzenleyerek pre ve post mikrodamarlanma üzerinde etkisinin olduğu görülmüştür. Çalışmamızın amacı, doksorubisin ile oluşturulan nefrotik sendrom modelinde, apelinin glomerüler ve tübüler hasar üzerindeki etkisinin ışık mikroskobu seviyesinde incelenmesidir.Yöntemler: Çalışmada yetişkin erkek Sprague-Dawley sıçanlar kullanıldı. Sıçanlar rastgele olarak (n=6) Kontrol (K; 1mL/kg i.p. serum fizyolojik (SF)); Apelin+Kontrol (APK; SF ve 50 mcg/kg/gün apelin-13 i.p.); Nefrotik Sendrom (NS; i.p. 10 mg/kg doksorubisin (DOX)) ve Nefrotik Sendrom+Apelin (NSAP; i.p. 10 mg/kg DOX+50 mcg/kg/gün apelin-13) gruplarına ayrıldı. Işık mikroskobu incelemeleri için 22. günde sıçanlar sakrifiye edilerek böbrek dokuları alındı.Bulgular: Işık mikroskobu incelemelerinde NS grubunda; glomerüllerde mezangial matriks artışı, glomerüler kapiller ve idrar boşluğunda daralma, Bowman kapsülüne yapışma izlendi; tübüllerde ise dilatasyon ve kast oluşumu şeklinde hasar görüldü. NSAP grubunda ise minimal düzeyde hasar gerilemesi gözlendi.Sonuç: Doksorubisin ile oluşturulan deneysel nefrotik sendrom modelinde apelinin glomerüler ve tübüler hasar üzerinde iyileştirici etkisinin histomorfolojik olarak minimal düzeyde olduğu gösterildi.
- Published
- 2016
15. Alterations in Cardiac Caveolin-3 Expression and Na/K ATPase Activity in Rats with Myocardial Infarction Are Reversed by Resveratrol
- Author
-
akkiprik, mustafa, tetik, şermin, yiğiner, ömer, çetinel, şule, özkan, naziye, Kaya, Zehra, çağlayan yeğen, berrak, şener, göksel, aykaç, aslı, tezcan, mehmet, and şehirli, ahmet özer
- Published
- 2015
16. BRAFV600E Immunohistochemistry in Papillary Thyroid Carcinomas: Relationship Between Clinical and Morphological Parameters.
- Author
-
KOMBAK, Faruk Erdem, ÖZKAN, Naziye, UĞURLU, Mustafa Ümit, and KAYA, Handan
- Subjects
- *
THYROID cancer , *PAPILLARY carcinoma , *CANCER genetics , *BRAF genes , *IMMUNOHISTOCHEMISTRY , *GENE expression - Abstract
Objective: To investigate the association of the BRAFV600E mutation with papillary thyroid carcinoma using clinical, morphological and prognostic parameters. We also intend to assess the utility of the BRAFV600E immunohistochemistry and compare it with BRAF polymerase chain reaction (RT-PCR). Material and Method: We applied BRAFV600E immunohistochemistry in a cohort of 107 papillary carcinomas, 19 adenomas and 13 normal thyroid tissues that was chosen retrospectively between 2011 and 2015. Statistical analysis was based on semiquantitative immunohistochemistry findings. We also applied BRAF RT-PCR in a subgroup of 14 papillary carcinomas, 13 metastatic lymph nodes and 4 adenomas that was chosen randomly. Results: In regard to the comparison of BRAFV600E immunohistochemistry and BRAF RT-PCR, a 3+ nuclear and cytoplasmic immunoexpression was considered 'positive'. The BRAFV600E mutation was most frequently observed in classic variant cases. No mutation was detected in follicular variant cases. The mutational status of the primary tumour and the lymph node metastasis was consistent. A significant relationship of the BRAFV600E mutation was found with prognostic factors such as higher pT stage, classic variant, lymphatic invasion, perineural invasion, lower mitotic index, lack of tumour capsule, intrathyroidal spread and extrathyroidal extension. Conclusion: Immunohistochemistry, using the VE1 clone, is a reliable technique for detection of the BRAFV600E mutation. Our results with immunohistochemistry are consistent with a previous effort. In our study, despite the correlation between some pathological prognostic parameters and the BRAFV600E mutation; poor prognosis was found to be irrelevant overall. Morphological parameters seem to be keener than the BRAFV600E mutation. Nevertheless, different series display different results, possibly due to environmental factors. Considering this and the proven success of targeted therapies against the BRAFV600E mutation a thorough assessment would be important. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
17. Doksorubisin ile oluşturulan deneysel nefrotik sendrom modelinde apelinin podositler üzerine etkisi: Işık ve elektron mikroskobu çalışması
- Author
-
Özkan, Naziye, Çetinel, Şule, and Histoloji ve Embriyoloji Anabilim Dalı
- Subjects
Kidney diseases ,Doxorubicin ,Microscopy-polarization ,Histology and Embryology ,Nephrotic syndrome ,Apelin ,Microscopy-electron ,Histoloji ve Embriyoloji ,Kidney-glomerulus ,Tıp - Abstract
ÖZETDoksorubisin ile oluşturulan deneysel nefrotik sendrom modelinde apelinin podositler üzerine etkisi : ışık Ve elektron mikroskobu çalışmasıAmaç: Nefrotik sendrom, böbrek yetmezliğine ilerleyebilen ve podosit hasarı oluşturan bir hastalıktır. Bir vazoaktif peptid olan apelin, etkisini apelin reseptörüne (APJ) bağlanarak gösterir. Glomerüler arteriollerin endotelyal ve vasküler düz kas hücrelerinde bulunan apelinin, böbrek hemodinamiğini düzenleyerek pre ve post mikrodamarlanma üzerinde etkisinin olduğu görülmüştür. Çalışmamızın amacı, doksorubisin ile oluşturulan nefrotik sendrom modelinde, apelinin proteinüri ve podosit hasarı üzerindeki etkisini, ışık ve elektron mikroskobu seviyesinde incelemek, bununla birlikte APJ’nin varlığını araştırmaktır.Gereç ve Yöntem: Çalışmada yetişkin erkek Sprague-Dawley sıçanlar kullanıldı. Sıçanlar randomize olarak (n=6) Kontrol (K; 1ml/kg i.p. serum fizyolojik (SF)); Apelin Kontrol (APK; SF ve 50 mcg/kg/gün Apelin-13 i.p.); Nefrotik Sendrom (NS; i.p. 10 mg/kg doksorubisin (DOX)) ve Nefrotik Sendrom+Apelin (NSAP; i.p. 10 mg/kg DOX+50 mcg/kg/gün Apelin-13) gruplarına ayrıldı. Yirmibirinci günün bitiminde idrar örnekleri toplandı; biyokimyasal, western blot, ışık ve elektron mikroskobu incelemeleri için böbrek dokuları alındı.Bulgular: Nefrotik sendrom grubunda proteinürinin K grubuna göre anlamlı olarak arttığı görüldü. Oksidatif stres belirteçleri olan MDA, NO, Lusigenin ve Luminolün NS grubunda anlamlı şekilde arttığı, NSAP grubunda ise azaldığı tespit edildi. GSH’ın ise NS grubunda anlamlı olarak azaldığı, NSAP grubunda arttğı izlendi. Işık mikroskobu incelemelerinde NS grubunda glomerüllerde mezangial matriks artışı ve tübüler hasar görüldü. NSAP grubunda ise minimal hasar gerilemesi gözlendi. Yine NS grubunda TGF-β immünekspresyonunda artış, NSAP grubunda minimal azalma gözlendi. Nefrin ve Apelin reseptör ekspresyonunda ise NS grubunda azalma görüldü. NS grubunda apoptotik hücre sayısı anlamlı artış gösterdi. Elektron mikroskobu incelemelerinde NS ve NSAP grubunda podosit ayaksı çıkıntılarında düzleşme görüldü. Tüm gruplarda podositlerde immün-altın işaretleme ile APJ varlığı gösterildi.Sonuçlar: Doksorubisin ile oluşturulan deneysel nefrotik sendrom modelinde apelinin podosit hasarı üzerinde iyileştirici etkisinin minimal olduğu gözlendi.Anahtar Sözcükler: glomerül, nefrotik sendrom, podosit, apelin, APJ.SUMMARYHistology and Embryology DepartmentPurpose: Nephrotic syndrom is a disease which may progress to podocyte degeneration and renal failure. Apelin, is a vasoactive peptide, shows its effect by binding the apelin receptor (APJ). Apelin, present in endotelial and vascular smooth muscle cells of glomerular arteriols has effects on the pre- and post- microvascularization through regulating renal hemodynamics. The purpose of our study is to determine the effects of apelin on the proteinuria and podocyte damage at light and electron microscopic levels, also to investigate the existence of APJ in the podocytes.Materials and Methods: Male Sprague-Dawley rats were used in the study. Rats were randomly divided into 4 groups (n=6) as Control (C; i.p. 1ml/kg physiological saline solution (PS)); Apelin Control (APC; PS and 50 mcg/kg/day Apelin-13 i.p.); Nephrotic Syndrome (NS; i.p. 10 mg/kg doxorubicin (DOX)) and Nephrotic Syndrome+Apelin (NSAP; i.p. 10 mg/kg DOX+50 mcg/kg/day Apelin-13). Urine samples and kidney tissues were collected at the end of 21st day for biochemical and western blot analyses, light and electron microscopic investigations.Results: In NS group, the significant increase in proteinuira was observed when compared with control group. The markers for the oxidative stress MDA, NO, Lucigenin ve Luminol, were increased significantly in NS while were decreased in the NSAP group. A significant decrease in GSH levels in NS group while an increase in the NSAP group was observe. In light microscopy, NS group revealed mesangial matrix accumulation in glomerules besides tubular damage. The minimal regression in the damage were seen in NSAP group. Immunoexpression of TGF- β were increased in NS group while there was a decrease in NSAP group. In NS group, expression of nephrin and APJ were decreased and the apoptotic cell number was increased significanty. In electron microscopic investigations, effacement of podocyte foot process were observed in NS and NSAP groups. In all groups, immunogold labelling of APJ were shown. Conclusion: Apelin has limited therapeutic effects on podocyte damage in experimental model of nephrotic syndrome induced by doxorubucin. Keywords: glomerulus, nephrotic syndrome, podocyte, apelin, APJ.
- Published
- 2015
18. The Effect of Apelin on Podocytes in Doxorubicin Induced Nephrotic Syndrome
- Author
-
Özkan, Naziye, primary
- Published
- 2017
- Full Text
- View/download PDF
19. Repair of critical size defects using bioactive glass seeded with adipose-derived mesenchymal stem cells
- Author
-
Saçak, Bülent, primary, Certel, Furkan, additional, Akdeniz, Zeynep D., additional, Karademir, Betül, additional, Ercan, Feriha, additional, Özkan, Naziye, additional, Akpinar, İhsan Nuri, additional, and Çelebiler, Özhan, additional
- Published
- 2016
- Full Text
- View/download PDF
20. siRNA’nın biyodağılımına kitozan komplekslerinin etkisi
- Author
-
Şalva, Emine, Özkan, Naziye, Kabasakal, Levent, Özbaş Turan, Suna, and Akbuğa, Jülide
- Subjects
siRNA,VEGF,kitozan,biyodağılım,meme kanseri - Abstract
Objective: RNAi is a powerful tool for controlling cellular processes in the gene silencing and in the analysis of molecular mechanisms for many diseases including cancer. VEGF signaling is a potential therapeutic target for siRNA delivery in breast cancer. Although siRNA can be potential therapeutic agent for various diseases, intracellular delivery of siRNA is one of the major hurdles to turn siRNA into therapeutically active molecules. To date, numerous transfection methods or delivery systems have been developed. Among them, chitosan is potential gene carrier due to its characteristics such as biodegradability, biocompatibility, non immunogenic and toxicity. The purpose of this study was to investigate the biodistribution and tumor localization of chitosan/ VEGF siRNA complexes in breast cancer model of rat.Method: In our study, we intravenously injected FITC labeled naked siRNA-VEGF (40 µg/rat) and chitosan/FITC labeled siRNAVEGF complexes (40 µg/rat) to breast tumor-bearing rats.Results: While the biodistribution of chitosan/siVEGF complexes to the brain and heart appeared almost similar to that observed for naked siVEGF, the accumulation was slightly lower in the spleen, liver, lungs, muscle and higher in the kidney. In the breast tumor tissue, chitosan/FITC-labeled VEGF siRNA complexes were localized in the tumor 15 min post-injection but naked FITCsiVEGF did not localize in tumor tissue.Conclusion: In this preliminary study, we revealed the promising potential of chitosan as VEGF siRNA delivery system for biodistribution. Key words: siRNA, VEGF, chitosan, biodistribution, breast cancer, Amaç: RNAi kanser dahil olmak üzere birçok hastalığın moleküler mekanizmasının analizinde ve gen susturulmasında hücresel proseslerin kontrolü için önemli bir araçtır. VEGF sinyali meme kanserinde siRNA taşınmasında önemli bir hedeftir. siRNA farklı hastalıklar için potansiyel bir ajan olmasına rağmen, siRNA’nın intrasellüler taşınması, terapötik olarak aktif bir moleküle dönüşmesindeki önemli engellerden biridir. Bugüne kadar birçok transfeksiyon yöntemi ve taşıyıcı sistem geliştirilmiştir. Bunlar arasında kitozan, biyouyumlu, biyoparçalanabilir olması, toksik ve immunojenik olmaması gibi özellikleri nedeniyle önemli bir gen taşıyıcısıdır. Bu çalışmanın amacı, meme kanserinde kitozan/VEGF-siRNA komplekslerinin tümör lokalizasyonunu ve biyodağılımını araştırmaktır.Yöntem: Çalışmamızda meme tümörü taşıyan sıçanlara serbest FITC-işaretli siVEGF (40 µg/sıçan) ve kitozan/ FITC-işaretli siVEGF (40 µg/sıçan) kompleksleri intravenöz olarak enjekte edildi.Bulgular: Kitozan/siVEGF komplekslerinin beyin ve kalbe biyodağılımı, serbest siVEGF ile hemen hemen benzerken, dalak, karaciğer, akciğer ve kasta biraz daha düşük ve böbrekte ise biraz daha yüksektir. Meme tümör dokusunda, kompleksler enjeksiyon sonrası 15 dakikada tümörde lokalize iken, serbest FITC-siVEGF tümör dokusunda lokalize değildir.Sonuç: Bu ön çalışmada, biz biyodağılım için VEGF siRNA taşıyıcı sistem olarak kitozanın umut verici olduğunu gösterdik. Anahtar Kelimeler: siRNA, VEGF, kitozan, biyodağılım, meme kanseri
- Published
- 2013
21. Protective effects of St. John's wort in the hepatic ischemia/reperfusion injury in rats.
- Author
-
Atalay, Süleyman, Soylu, Belkıs, Aykaç, Aslı, Öğünç, Ayliz Velioğlu, Çetinel, Şule, Özkan, Naziye, Erzik, Can, and Şehirli, Ahmet Özer
- Subjects
ISCHEMIA ,REPERFUSION injury ,NEUTROPHILS ,OXIDATIVE stress ,CELL death - Abstract
Objectives: The purpose of this study was to investigate possible protective effects of St. John's wort in the hepatic ischemia/reperfusion injury. Material and Methods: The hepatic artery, portal vein, and bile duct were all clamped for 45 minutes to induce ischemia in rats, and after that reperfusion for 1 hour. SJW was administrated orally, once a day for 3 days before ischemia/reperfusion. The aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and interleukin levels were measured in the serum samples. Luminol chemiluminescence, lucigenin luminol chemiluminescence levels; myeloperoxidase. The sodium-potassium ATPase (Na+/K+ ATPase) activity was determined in the liver tissue, and caspase-3 and caspase-9 activity with the bcl-2/bax ratio were measured by the western blot analysis. Results: The St. John's wort administration recovered the aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and IL-1ß levels serum parameters meaningfully, while ischemia/reperfusion caused an increase in luminol chemiluminescence, lucigenin luminol chemiluminescence, myeloperoxidase, caspase-3, and caspase-9 activity and led to a decrease in the B-cell lymphoma-2/bcl-2-associated X protein (bcl-2/bax) ratio and the Na+/K+ ATPase activity. Conclusion: The obtained results indicate protective effects of St. John's wort on the ischemia/reperfusion injury through various mechanisms, and we are able to suggest that St. John's wort can clinically create a new therapeutic principle. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
22. OP-022 Alterations in Cardiac Caveolin-3 Expression and Na/K ATPase Activity in Rats with Myocardial Infarction Are Reversed by Resveratrol
- Author
-
Şehirli, Ahmet Özer, primary, Tetik, Şermin, additional, Yiğiner, Ömer, additional, Çetinel, Şule, additional, Özkan, Naziye, additional, Akkiprik, Mustafa, additional, Kaya, Zehra, additional, Yeğen, Berrak Çağlayan, additional, Tezcan, Mehmet, additional, Aykaç, Aslı, additional, and Şener, Göksel, additional
- Published
- 2015
- Full Text
- View/download PDF
23. Repair of critical size defects using bioactive glass seeded with adipose-derived mesenchymal stem cells.
- Author
-
Saçak, Bülent, Certel, Furkan, Akdeniz, Zeynep D., Karademir, Betül, Ercan, Feriha, Özkan, Naziye, Akpinar, İhsan Nuri, and Çelebiler, Özhan
- Abstract
Bioactive glass has been demonstrated as a biocompatible bone substitute. However bone healing process can be prolonged due to late resorption of the material. Adipose derived stem cells (ASC) have osteogenic differentiation potential and hence can be a cell source for bone regeneration. The aim of this study was to test whether combination of bioactive glass with ASCs would enhance bone regeneration. Following creation of critical sized defects on the calvaria of 32 Wistar rats, the animals were randomly divided into four groups: Group C (control): Defects were left untreated; Group G: Defects were covered with autologous bone graft; Group BG: Defects were filled with bioactive glass; Group BG/ASC: Defects were filled with bioactive glass seeded with ASCs. The defect size was significantly greater in Group C compared to all other groups. Bone density was significantly lower in Group C compared to Group G and Group BG/ASC. Bone regeneration score of Group C was significantly lower than other groups. Group BG/ASC demonstrated lamellar bone and havers canal formation. The results of this study demonstrated that bioactive glass implanted with ASC is a biocompatible construct stimulating radiologically and histologically evident bone regeneration similar to autologous bone grafting. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1002-1008, 2017. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
24. Effect of FK506 in experimental mesangial proliferative glomerulonephritis by immunostaining methods
- Author
-
Özkan, Naziye, Çakalağaoğlu, Fulya, Pataloji Anabilim Dalı, and Patoloji Anabilim Dalı
- Subjects
Pathology ,Patoloji ,Pataloji - Abstract
1. ÖZET Anti-Thy-1.1 glomeriilonefrit, mezangial hücre proliferasyonu ve mezangial matriks artışı ile karakterize deneysel bir glomeriilonefrit modelidir. Bu çalışmada deneysel anti-Thy-1.1 glomerülonefrit modelinde farklı immünohistokimyasal yöntemlerle PCNA ve a-SMA ekspresyonunu araştırdık. İmmünohistokimyasal boyama, protein ekspresyonlarmı araştırmak ve ölçmek için yaygın olarak kullamlmaktadır. Double boyama yöntemi parafin kesitler ve sitolojik yaymalara uygulanabilen bir yöntemdir. Bu yöntem özel teçhizat veya teknik donanım gerektirmez. Takrolimus (FK506), otoimmün hastalıkların tedavisinde ve organ nakillerinden sonra kullanılan immünsupressif bir ilaçtır. Bu çalışmanın amacı, deneysel glomerülonefrit modelinde Prolifere Hücre Nükleer Antijen (PCNA) ve a-düz kas aktin `a-Smooth Muscle Acun` (a-SMA) immünekpresyonlarmı, Streptavidin-Biotin /Alkalen Fosfataz kompleks (Str.ABC/AP), Streptavidin-Biotin/Horseradish Peroksidaz kompleks (Str.ABC/HRP) ve double immünohistokimya (Str.ABC/HRP ve Str.ABC/AP) boyama metotları ile araştırmaktır. Ayrıca deneysel glomerülonefrit modelinde takrolimus etkisini de gözden geçirmektir. Yirmi Wistar Albino sıçan bu çalışmada 5 'erli dört gruba ayrılmıştır. Grup I Kontrol (K): Dört hafta 0,lml/100g serum fizyolojik (SF) intravenöz uygulanmıştır; grup II Glomerülonefrit (GN): O.gün anti-Thy 1.1 antikor (0,25ug/100g) intravenöz uygulanmıştır; grup III Glomerülonefrit+FK506 (GFK): önce anti-Thy 1.1 antikor (0,25ug/100g) O.günde, sonra FK506 (lmg/kg) iki hafta süresince uygulanmıştır. Grup IV Kontrol+FK506 (KFK): önce iki hafta SF (0,lml/100g), daha sonra iki hafta boyunca FK506 (lmg/kg ) uygulanmıştır. Çalışma sonunda serumda kreatinin, idrarda kreatin, kreatin klirensi ve proteinüri bakılmıştır. Böbrek dokusunda; ışık mikroskobunda, glomerüler ve tubulointerstisyel alanda, PCNA ve a-SMA immünekspresyonu Str.ABC/HRP, Str.ABC/AP ve double immünohistokimya ile boyanan lamlarda değerlendirilmiştir. Çalışma sonunda; kontrol grubuna göre, glomerülonefrit grubunda glomerüler hücre proliferasyonu ve tubulointerstisyel hasar anlamlı ölçüde artmıştır.Tüm gruplarda uyguladığımız immünohistokimyasal metotlar ile a-SMA ekspresyonu birbirine yalan bulunmuştur. a-SMA nin tubulointerstisyal alanda immünekspresyonu Str.ABC/AP ve Str.ABC/HRP boyama yöntemlerinde GFK grubunda GN grubuna göre anlamlı derecede azalmıştır. Tüm immünohistokimya yöntemlerinde tubulointerstisyel alan ve glomerüllerde PCNA immünekspresyonu K grubuna göre GN grubunda, KFK grubuna göre GFK' de arttığı bulunmuştur. Sonuçta double immünohistokimya boyama yönteminin, aynı bölgede iki farklı antijenin araştırılmasında kullanılabilecek güvenilir ve basit bir yöntem olduğu gösterilmiştir. 2. SUMMARY Effect of FK506 in Experimental Mesangial Proliferative Glomerulonephritis by Immunostaining Methods The anti-Thy-1.1 model is a rat model of mesangial proliferative glomerulonephritis characterized by mesangial cell proliferation and accumulation of mesangial matrix expansion. In present study we investigate the expression of a-smooth muscle actin (a- SMA) and proliferative cell nuclear antigen (PCNA) in renal cortex in the rat model of mesangial proliferative glomerulonephritis induced with anti-Thy-1.1 antibody by different immunohistochemical methods. Immunostaining is used widely for detection and measurement of protein expression. The double staining method described may have wide application since it can be used both for paraffin sections and cell smears. It does not require specialized technique or aparatus. Tacrolimus (FK506) is an immunosuppressive drug used for the treatment of autoimmune disease and after organ transplantations. The aim of our study to evaluate the immunexpression PCNA and a-SMA in anti-Thy-1.1 diffuse experimental glomerulonephritis rat model by Str.ABC/HRP, StrABC/AP and double (Str.ABC/HRP and Str.ABC/AP) immunohistochemistry methods. Also we want to investigate tacrolimus effect in this experimental glomerulonephritis model. Twenty male Wistar Albino rats were divided into four groups of fifth: Group I Control (C): 5 treated 0,1ml /100g normal saline intravenously (IV) for four weeks; group II glomerulonephritis (GN): 5 treated with anti-Thy 1.1 (0,25ug/100g) IV at 0 day; group III Glomerulonephritis+FK506 (GFK): 5 treated with Anti-Thy-1.1 (0,25ug/100g) IV at 0 day then FK506 (lmg/kg) for two weeks. Group TV Control+FK506 (CFK): 5 treated with normal saline (O.lmg/lOOmg) both for two weeks then FK506 (lmg/kg) for two weeks. Serum creatinine, urinary creatinine, creatinine clearance and proteinuria were performed at the end of the study period. Renal tissue were assessed for light microscopic findings glomerul and tubulointerstitial injury andPCNA, a-SMA expression were semiquantatitively scored on glomeruli and tubulointerstitium by Str.ABC/HRP, Str.ABC/AP and double immunohistochemical methods staining slides. At the end of the study period morphological changes including tubulointerstitial injury and glomerular cell proliferations were significantly increased in glomeulonephritis group compared to control group. With in immunohistochemical methods, glomerular immunoexpression of a-SMA was similar in all groups. Tubulointestitial immunoexpression of a-SMA was significantly statical decreased in Str.ABC/AP and Str.ABC/HRP in GFK compared to GN group. Immunoexpression of PCNA in all immunohistochemical methods on tubulointerstitial and glomeruli was significant increased in GN group compared to C, and GFK group compared to CFK. In conclusion double lmmunostaing was the method to detect two antigen in same site. That method was simple and reliable. 4 118
- Published
- 2005
25. Local Delivery of Chitosan/VEGF siRNA Nanoplexes Reduces Angiogenesis and Growth of Breast CancerIn Vivo
- Author
-
Şalva, Emine, primary, Kabasakal, Levent, additional, Eren, Fatih, additional, Özkan, Naziye, additional, Çakalağaoğlu, Fulya, additional, and Akbuğa, Jülide, additional
- Published
- 2012
- Full Text
- View/download PDF
26. Chitosan/Short Hairpin RNA Complexes for Vascular Endothelial Growth Factor Suppression Invasive Breast Carcinoma
- Author
-
Şalva, Emine, primary, Kabasakal, Levent, additional, Eren, Fatih, additional, Çakalağaoğlu, Fulya, additional, Özkan, Naziye, additional, and Akbuğa, Jülide, additional
- Published
- 2010
- Full Text
- View/download PDF
27. Local Delivery of Chitosan/VEGF siRNA Nanoplexes Reduces Angiogenesis and Growth of Breast Cancer In Vivo.
- Author
-
Şalva, Emine, Kabasakal, Levent, Eren, Fatih, Özkan, Naziye, Çakalağaoğlu, Fulya, and Akbuğ, Jülide
- Published
- 2012
- Full Text
- View/download PDF
28. The Effect of Chitosan Complexes on Biodistribution of siRNA.
- Author
-
Şalva, Emine, Özkan, Naziye, Kabasakal, Levent, Turan, Suna Özbaş, and Akbuğa, Jülide
- Published
- 2011
29. Differences in the Cytological Features of Atypical Adenomatous Hyperplasia and Low-Grade Prostatic Adenocarcinoma.
- Author
-
Mıdı, Ahmet, Tecımer, Tülay, Bozkurt, Süheyla, and Özkan, Naziye
- Subjects
HYPERPLASIA ,ADENOCARCINOMA ,BASAL cell carcinoma ,CYTOPLASM ,POLYMORPHISM (Crystallography) - Abstract
Copyright of Turkish Journal of Pathology is the property of Turkish Journal of Pathology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2010
- Full Text
- View/download PDF
30. Differences in the structural features of atypical adenomatous hyperplasia and low-grade prostatic adenocarcinoma.
- Author
-
Midi, Ahmet, Tecimer, Tülay, Bozkurt, Süheyla, and Özkan, Naziye
- Subjects
HYPERPLASIA ,ADENOCARCINOMA ,PROSTATE ,PROSTATECTOMY ,CELLULAR pathology - Abstract
Aim: Atypical adenomatous hyperplasia (AAH) is a small glandular proliferation that has histological similarities with Gleason grade 1 and 2 prostatic adenocarcinoma (PACG1,2). There are no distinct histomorphological criteria distinguishing these two lesions from each other and other small glandular proliferations. Because treatment approaches are different for these lesions, it is necessary to determine histological criteria. The aim of this study is to review the histological features of these two lesions and to define new histological criteria distinguishing AAH from PACG1,2. We, therefore, assessed 18 anatomical and structural parameters. Materials and Methods: We found 11 AAH (22 foci) and 15 PACG1,2 (22 foci) cases in 105 radical prostatectomy specimens. Basal cell-specific antikeratin was applied to these lesions. We assumed that PACG1,2 lesions did have not basal cells and we grouped the lesions as AAH and PACG1,2 based on this assumption. Results: We found differences between AAH and PACG1,2 lesions for some parameters including the number of glands, structures such as the main ductus and basal cells. We found similar properties in the two lesions for the following parameters: localization, multiplicity, diameter of the lesion, focus asymmetry, distance between glands, inflammatory cells in and out of the lesions, secretory cell shape on the luminal side, papillary projection towards the luminal side of gland, the shape of the outer gland, the infiltrative pattern of the gland, glandular pleomorphism, biggest gland diameter and median gland diameter. Conclusion: We determined that concurrent evaluation of histomorphological features was important to differentiate between AAH and PACG1,2. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.