Browsing by Author "TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR"
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Publication Amount of reoperation following surgical repair of nonsyndromic craniosynostosis at a single center(Tubitak Scientific & Technological Research Council Turkey, 2022-01-01) Baykal, Duygu; Balcin, Rabia Nur; Taskapılıoğlu, Mevlut Özgür; Balcin, Rabia Nur; BALÇIN, RABİA NUR; Taskapılıoğlu, Mevlut Özgür; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahisi Anabilim Dalı.; 0000-0001-9833-9392; 0000-0001-5472-9065; GXV-3107-2022Background/aim: Craniosynostosis is a deformity of the skull that occurs as a result of early fusion of one or more cranial sutures and can be accompanied by neurological deficits. Craniosynostosis can be classified as syndromic or nonsyndromic according to the type of suture involved. Surgical treatment of craniosynostosis in infants basically involves loosening and opening the fused sutures to reduce intracranial pressure, allow the brain to grow, and also fix the skull shape. However, in such cases there is a risk of resynostosis after surgery. According to the literature, resynostosis rates vary between 0% and 70%. In this study, we aimed to evaluate the reoperation rate in craniosynostosis cases treated surgically in our clinic.Material and methods: A retrospective analysis of 70 nonsyndromic craniosynostosis cases treated surgically in the Neurosurgery Department of Bursa Uludag University from 2005 to 2019 was performed. All patients had undergone total cranial vault remodeling surgically and had been followed up for at least a year.Results: The study group included 70 patients, comprising 40 (57.1%) male and 30 (42.9%) female patients. The mean age of the group was 10.9 +/- 7.8 months (range 3-34 months). Out of 70 patients, repeat surgery due to resynostosis had been performed once in 5 (7.1%) patients and twice in 1 (1.4%) patient.Conclusion: It should be kept in mind that resynostosis may occur in patients who have been operated for craniosynostosis. Patients should be examined cosmetically and if necessary, radiologically in the follow-up. Further studies based on larger sample size are recommended for more quantitative data and better results.Publication Co-loading of Temozolomide with Oleuropein or rutin into polylactic acid core-shell nanofiber webs inhibit glioblastoma cell by controlled release(Elsevier, 2023-09-03) Erçelik, Melis; Tekin, Çağla; Parin, Fatma Nur; Mutlu, Büşra; Doğan, Hazal Yılmaz; Tezcan, Gülçin; Aksoy, Seçil Ak; Gürbüz, Melisa; Yıldırım, Kenan; Bekar, Ahmet; Kocaeli, Hasan; Taşkapılıoğlu, Mevlüt Özgür; Eser, Pınar; Tunca, Berrin; Erçelik, Melis; Tekin, Çağla; TEZCAN, GÜLÇİN; Aksoy, Seçil Ak; Gürbüz, Melisa; BEKAR, AHMET; KOCAELİ, HASAN; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Eser, Pınar; TUNCA, BERRİN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Diş Hekimliği Fakültesi/Temel Bilimler Bölümü.; Bursa Uludağ Üniversitesi/İnegöl Meslek Yüksekokulu.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Deney Hayvanları Yetiştirme ve Araştırma Birimi.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Anabilim Dalı.; 0000-0002-1640-6035; 0000-0003-0132-9927; 0000-0002-1619-6680; ABX-9081-2022; AAI-2073-2021; HKM-7750-2023; EUG-3329-2022; GDC-6329-2022; JJL-1176-2023; JJH-2235-2023; CGB-7869-2022; FDK-3229-2022; IRO-2619-2023Glioblastoma (GB) has susceptibility to post-surgical recurrence. Therefore, local treatment methods are required against recurrent GB cells in the post-surgical area. In this study, we developed a nanofiber-based local therapy against GB cells using Oleuropein (OL), and rutin and their combinations with Temozolomide (TMZ). The polylactic acid (PLA) coreshell nanofiber webs were encapsulated with OL (PLA(OL)), rutin (PLA(rutin)), and TMZ (PLA(TMZ)) by an electrospinning process. A SEM visualized the morphology and the total immersion method determined the release characteristics of PLA webs. Real-time cell tracking analysis for cell growth, dual Acridine Orange/Propidium Iodide staining for cell viability, a scratch wound healing assay for migration capacity, and a sphere formation assay for tumor spheroid aggressiveness were used. All polymeric nanofiber webs had core -shell structures with an average diameter between 133 +/- 30.7-139 +/- 20.5 nm. All PLA webs promoted apoptotic cell death, suppressed cell migration, and spheres growth (p < 0.0001). PLA(OL) and PLA(TMZ) suppressed GB cell viability with a controlled release that increased over 120 h, while PLA(rutin) caused rapid cell inhibition (p < 0.0001). Collectively, our findings suggest that core-shell nanowebs could be a novel and effective therapeutic tool for the controlled release of OL and TMZ against recurrent GB cells.Publication Coexistence of TERT C228T mutation and MALAT1 dysregulation in primary glioblastoma: new prognostic and therapeutic targets(Taylor & Francis, 2021-06-21) Ak Aksoy, Seçil; Mutlu, Melis; Tunca, Berrin; Kocaeli, Hasan; Taşkapılıoğlu, Mevlüt Özgür; Bekar, Ahmet; Tekin, Çağla; Arğadal, Ömer Gökay; Civan, Muhammet Nafi; Kaya, İsmail Seçkin; Ocak, Pınar Eser; Tolunay, Şahsine; AKSOY, SEÇİL; Mutlu, Melis; TUNCA, BERRİN; KOCAELİ, HASAN; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; BEKAR, AHMET; Tekin, Çağla; ARGADAL, ÖMER GÖKAY; Civan, Muhammet Nafi; KAYA, İSMAİL SEÇKİN; OCAK, PINAR; TOLUNAY, ŞAHSİNE; Bursa Uludağ Üniversitesi/İnegöl Meslek Yüksekokulu.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; 0000-0002-1619-6680; 0000-0001-5472-9065; 0000-0003-0132-9927; 0000-0002-5126-1548; ADM-8457-2022; ABX-9081-2022; AAI-2073-2021; FPB-0403-2022; ABI-6078-2020; FDK-3229-2022; AAW-5254-2020; GDC-6329-2022; CCA-2925-2022; HKP-0793-2023; ILC-4543-2023; AAI-1612-2021Objective: This study was designed to conduct molecular classification based on IDH1/2, TERT, ATRX, and DAXX changes in pediatric and adult primary glioblastoma (GB) and to analyze the potential interaction of LncRNA MALAT1 in the determined homogeneous subgroups. Methods: We analyzed the expression profiles of ATRX/DAXX and MALAT1 using the qRT-PCR method and IDH and TERT mutation status using DNA sequencing analysis in 85 primary pediatric and adult GB patients. Results: IDH1 mutation was observed in 5 (5.88%) and TERT mutation in 65 (76.47%) primary pediatric and adult GB patients. ATRX and DAXX were detected in 18 (21.18%) and 7 (8.24%) patients. TERT mutation and loss of ATRX/DAXX were associated with short overall survival (p < 0.001, p < 0.001, respectively). Patients carrying especially TERT C228T mutation had worse prognosis (p < 0.001). Six subgroups were obtained from the genetic analysis. Among the subgroups, MALAT1 was highly expressed in group A that had a single TERT mutation as compared to that in groups D and E (p = 0.001 and p < 0.001, respectively); further, high MALAT1 expression was associated with worse prognosis in patients with C228T mutation (p < 0.001). Conclusions: Our findings highlight that the presence of TERT C228T mutation and expression of MALAT1 can be used as primary targets during the follow-up of primary GB patients and in the development of new treatment strategies.Publication Comparison of clinical and molecular wnt and shh subgroups in medulloblastoma tumor cases(Turkish Neurosurgical Soc, 2021-01-01) Kaya, Ismail Seckin; Aksoy, Secil; Mutlu, Melis; Tekin, Cagla; Taskapilioglu, Mevlut Ozgur; Tunca, Berrin; Civan, Muhammet Nafi; Ocak, Pinar Eser; Kocaeli, Hasan; Bekar, Ahmet; Egeli, Unal; Cecener, Gulsah; Tolunay, Sahsine; Kaya, Ismail Seckin; KAYA, İSMAİL SEÇKİN; Aksoy, Secil; AKSOY, SEÇİL; Mutlu, Melis; Tekin, Cagla; Taskapilioglu, Mevlut Ozgur; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Tunca, Berrin; TUNCA, BERRİN; Civan, Muhammet Nafi; Ocak, Pinar Eser; Kocaeli, Hasan; KOCAELİ, HASAN; Bekar, Ahmet; BEKAR, AHMET; Egeli, Unal; EGELİ, ÜNAL; Cecener, Gulsah; ÇEÇENER, GÜLŞAH; Tolunay, Sahsine; TOLUNAY, ŞAHSİNE; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Bölümü.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Medikal Biyoloji Bölümü.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Pataloji Anabilim Dalı.; 0000-0001-5472-9065; 0000-0002-1619-6680; 0000-0003-0132-9927; 0000-0001-7904-883X; 0000-0002-3820-424X; AAH-1420-2021; AAH-8540-2021; ABX-9081-2022; HKP-0793-2023; AAI-2073-2021AIM: To determine the Wnt and SHH subtypes at the molecular level, and to compare them clinically by examining the changes in CTNNB1, AXIN, PTCH1, SMO, SUFU, and GLI1 mRNA expression in the medulloblastoma of a Turkish population determined according to patient selection criteria. In this context, the clinical distinction between Wnt and SHH groups are realized by considering the age, gender, survival time, location of the lesion, and radiological features of the patients.MATERIAL and METHODS: Molecular separation was performed by RT-PCR analysis of CTNNB1, AXIN, PTCH1, SMO, SUFU, and GLI1 mRNA expression changes.RESULTS: About 17.8% and 22.2% of the cases were included in the Wnt and the SHH group, respectively. When comparing group differences based on clinical and molecular data, 72.7% and 66.6% of matches were observed in the Wnt and the SHH group, respectively.CONCLUSION: It has been revealed that molecular analysis and grouping of patients with medulloblastoma can provide support for clinically determined subgroups.Publication Ct-guided percutaneous trigeminal tractotomy-nucleotomy for intractable craniofacial pain(Karger, 2020-09-01) Türkkan, Alper; Bekar, Ahmet; BEKAR, AHMET; Eser Ocak, Pınar; Taşkapılıoğlu, M. Özgür; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; OCAK, PINAR; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Nöroloji Anabilim Dalı.; 0000-0003-0132-9927; 0000-0001-5472-9065; ABX-9081-2022; ABB-8161-2020; AAI-2073-2021Object:In this report, we aimed to analyze the outcome results of our patients who underwent percutaneous trigeminal tractotomy (TR) and nucleotomy (NC) procedures, which are defined as destructive procedures targeting the descending trigeminal tractus and nucleus caudalis of the spinal trigeminal nucleus, respectively, for intractable craniofacial pain.Methods:The medical records of a total of 12 patients who underwent a total of 14 computed tomography (CT)-guided TR-NC procedures at our clinics between 2005 and 2017 were retrospectively reviewed.Results:A significant increase in patients' performance status (p= 0.015) as well as a significant decrease in the VAS score (p< 0.001) were achieved. Grade I pain relief (VAS = 0, no pain) was established in 66.7% of the patients, whereas grade II pain relief was observed in the remaining patients. Two of the patients suffered from recurrent pain after the initial procedure. Both patients underwent a second trigeminal TR-NC procedure, and grade I pain relief was re-established. The mean VAS score at 3-month follow-up was 1.4 +/- 1.1, whereas this score at 6-month follow-up was 2 +/- 1.3. The trigeminal TR-NC procedure resulted in a significant decrease in patients' VAS scores at 3- and 6-month follow-up visits compared with preoperative VAS scores (p< 0.001). Transient ataxia was noted in only one patient (8.3%) early after the procedure.Conclusions:The results presented in the current study support the efficacy of the percutaneous CT-guided trigeminal TR-NC procedure in the management of intractable facial pain in selected patients. The use of CT guidance allows direct visualization of the target area, thereby enhancing the safety and success of the procedure.Publication Diabetes mellitus-mediated MALAT1 expression induces glioblastoma aggressiveness(Turkish Neurosurgical Soc, 2023-01-01) Kocaeli, Aysen Akkurt; Aksoy, Seçil A. K.; Erçelik, Melis; Tezcan, Gülçin; Tekin, Çağla; Kocaeli, Hasan; Bekar, Ahmet; Taşkapılıoğlu, Mevlüt Özgür; Tolunay, Şahsine; Tunca, Berrin; AKSOY, SEÇİL; Erçelik, Melis; TEZCAN, GÜLÇİN; Tekin, Çağla; KOCAELİ, HASAN; BEKAR, AHMET; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; TOLUNAY, ŞAHSİNE; TUNCA, BERRİN; Bursa Uludağ Üniversitesi/İnegöl Meslek Yüksekokulu.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Diş Hekimliği Fakültesi/Temel Bilimler Bölümü.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; 0000-0002-3760-9755; ADM-8457-2022; EUG-3329-2022; JJL-1176-2023; GDC-6329-2022; FDK-3229-2022; JWS-5881-2024; IRO-2619-2023; AAI-1612-2021; JXJ-7901-2024AIM: To describe the role of metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) in glioblastoma (GB) progression in patients concurrently diagnosed with diabetes mellitus (DM).MATERIAL and METHODS: Formalin-fixed paraffin-embedded (FFPE) tumor samples of 47 patients diagnosed with GB only and 13 patients diagnosed with GB and DM (GB-DM) were enrolled in this study. Data for p53 and Ki67 immunohistochemical staining of the tumors and blood HbA1c levels of patients with DM were retrospectively collected. MALAT1 expression was assessed using quantitative real-time polymerase chain reaction.RESULTS: The coexistence of GB and DM induced the nuclear expression of p53 and Ki67 compared with GB only. MALAT1 expression was higher in GB-DM tumors than in GB only tumors. The expression of MALAT1 and HbA1c levels were positively correlated. Additionally, MALAT1 was positively correlated with tumoral p53 and Ki67. The disease-free survival of patients with GB-DM with high MALAT1 expression was shorter than that of those diagnosed with GB only and with a lower MALAT1 expression.CONCLUSION: Our findings suggest that one of the mechanisms of the facilitating effect of DM on GB tumor aggressiveness is via MALAT1 expression.Publication Does glioblastoma cyst fluid promote sciatic nerve regeneration?(Medknow Publications & Media, 2015-08-20) Özay, Rafet; Aktaş, Abit; Taşkapılıoğlu, Mevlüt Özgür; Gürer, Bora; Erdoğan, Bülent; Çağlar, Yusuf Şükrü; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Anabilim Dalı.; 0000-0001-5472-9065; ABB-8161-2020; AAW-5254-2020Glioblastoma cyst fluid contains growth factors and extracellular matrix proteins which are known as neurotrophic and neurite-promoting agents. Therefore, we hypothesized that glioblastoma cyst fluid can promote the regeneration of injured peripheral nerves. To validate this hypothesis, we transected rat sciatic nerve, performed epineural anastomosis, and wrapped the injured sciatic nerve with glioblastoma cyst fluid- or saline-soaked gelatin sponges. Neurological function and histomorphological examinations showed that compared with the rats receiving local saline treatment, those receiving local glioblastoma cyst fluid treatment had better sciatic nerve function, fewer scars, greater axon area, counts and diameter as well as fiber diameter. These findings suggest that glioblastoma cyst fluid can promote the regeneration of injured sciatic nerve and has the potential for future clinical application in patients with peripheral nerve injury.Publication Effects of vitamin B12 and folic acid deficiencies on cogniton: Experience from a tertiary center in Turkey(Elsevier, 2015-10-15) Özyurtlu, D.; Örün, M. O.; Sıvacı, A.; Demiralay, A.; Türkeş, N.; Can, F. E.; Çavuşoğlu, M.; Taşkapılıoğlu, M. Ö.; Bakar, H. M.; ÖZYURTLU, DAMLA; ÖRÜN, MUHAMMED OKAY; SIVACI, ALİ ÖZHAN; DEMİRALAY, AHMET; TÜRKEŞ, NEVİN; CAN, FATMA EZGİ; ÇAVUŞOĞLU, MERVE; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; BAKAR, HACI MUSTAFAPublication Electromyographic evaluation of early stage results of exoscopic microdecompressive spinal surgery in dogs(Univ Fed Rio Grande Do Sul, 2020-04-09) Salcı, Hakan; SALCI, HAKAN; Acar, Hilal; ACAR, HİLAL; Taskapılıoğlu, Mevlüt Özgür; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Bursa Uludağ Üniversitesi/Veteriner Fakültesi/Cerrahi Anabilim Dalı.; 0000-0001-5472-9065; ABB-8161-2020; JPN-6878-2023; AAW-5254-2020Background: Spinal surgical interventions are generally used in the treatment of various spinal pathologies such as vertebral fracture, luxation-subluxation, congenital vertebral deformities, discal hernia, infection and tumor. Minimally invasive spinal surgery contributes to rapid recovery by reducing iatrogenic muscle damage and postoperative pain. In minimally invasive spinal surgery, a new hybrid imaging technique, the exoscope, has been developed in the last decade. The purpose of this study was to report efficacy of the exoscopic micro-decompressive spinal surgery (MDSS) and its early postoperative electromyography (EMG) results in dogs.Materials, Methods & Results: The material of this study consisted of the owned 10 dogs with spinal cord injury resulted from the different etiologies. On the basis of examinations, medical support (fluid therapy, corticosteroid, etc.) was applied to the required dogs. Exoscopic MDSS was performed under general anesthesia in dogs. The neurologic, radiologic and EMG examination were completed at pre- and postoperative periods. EMG results at postoperative 1st week showed increased conduction velocity and amplitudes in 3 cases. There was no significant change in a case. And, there was a slight slowdown in conduction velocity and significant decrease in amplitudes in a case. At postoperative 4th week, ther was increased conduction velocity and amplitudes in 8 cases and needle EMG showed that spontan muscle activity was normal in 5 cases, mild in 2 cases, moderate a case and severe in a case. But spontan muscle activity was unfollowed in a case. Postoperative outcomes were poor in 3 cases, fair in 3 cases, good in 3 cases and unfollowed in a case.Discussion: Spinal cord injuries encountered in veterinary medicine have significant morbidity and mortality. In spinal patients, in addition to neurological examination, lesion localization can be determined using imaging techniques such as radiology, computed tomography, and MRI. EMG and somatosensory evoked potentials examinations are used to evaluate quantitative functional recovery, especially in spinal cord injuries. EMG also provides an opportunity to evaluate muscle activation patterns during recovery. Exoscopic spinal surgery is the newest hybrid imaging technique. Exoscopic MDSS facilitated manipulation by providing adequate illumination and vision at the exploration site. Exoscopic MDSS has the advantages of microscopic surgery and is a new technique that can be applied in dogs with spinal pathology.Publication Intracranial extra-axial mesenchymal chondrosarcoma in a 16-month-old patient with a literature review of pediatric patients(Springer, 2020-04-28) Yapıcıer, Özlem; Nanah, Abdel Rahman; Taşkapılıoğlu, Mevlüt Özgür; Demir, Mustafa Kemal; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Anabilim Dalı.; 0000-0001-5472-9065; AAW-5254-2020; ABB-8161-2020Mesenchymal chondrosarcoma is a rare high-grade malignant subtype of chondrosarcoma that is characterized by undifferentiated, round, or spindled mesenchymal cells, interspersed with islands of hyaline cartilage. We report a primary intracranial extra-axial mesenchymal chondrosarcoma in a 16-month-old patient with a review of the literature focusing on intracranial extra-axial MCs with or without skull involvement in pediatric patients, including differential diagnosis. The patient was admitted with a swelling in the right temporooccipital region. There was intracranial extra-dural extension of the mass, which abuts the neural parenchyma without any invasion. A complete tumor resection was performed. Pathological diagnosis was mesenchymal chondrosarcoma. The patient was free of symptoms after surgery.Publication Long non-coding rnas as a predictive markers of group 3 medulloblastomas(Taylor & Francis, 2021-08-28) Mutlu, Melis; Tekin, Çağla; Ak Aksoy, Seçil; Taşkapılıoğlu, Mevlüt Özgur; Kaya, Seçkin; Balcin, Rabia Nur; Ocak, Pınar Eser; Bekar, Ahmet; Tolunay, Şahsine; Tunca, Berrin; Mutlu, Melis; Tekin, Çağla; Ak Aksoy, Seçil; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; KAYA, İSMAİL SEÇKİN; BALÇIN, RABİA NUR; OCAK, PINAR; BEKAR, AHMET; TOLUNAY, ŞAHSİNE; TUNCA, BERRİN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/İnegöl Meslek Yüksekokulu.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; 0000-0001-5472-9065; 0000-0002-4256-2250; 0000-0003-0132-9927; 0000-0002-1619-6680; GXV-3107-2022; AAI-2073-2021; ADM-8457-2022; ABX-9081-2022; FPB-0403-2022; GDC-6329-2022; AAW-5254-2020; JGS-1849-2023; FDK-3229-2022; AAI-1612-2021Objective The appropriate treatments for the different molecular subgroups of medulloblastomas are challenging to determine. Hence, this study aimed to examine the expression profiles of long non-coding RNAs (LncRNAs) to determine a marker that may be important for treatment selection in these subgroups. Methods Changes in the expression of LncRNAs in the tissues of patients with medulloblastoma, which are classified into four subgroups according to their clinical characteristics and gene expression profiles, were examined via reverse transcription polymerase chain reaction. Moreover, there association with patient prognosis was evaluated. Results The expression levels of MALAT1 and SNGH16 were significantly higher in patients with group 3 medulloblastoma than in those with other subtypes. Patients with high expression levels of MALAT1 and SNGH16 had a relatively shorter overall survival than those with low expression levels. Conclusions Patients with group 3 medulloblastoma have a high MALAT1 level, which is associated with poor prognosis. Therefore, MALAT1 can be a new therapeutic target in medulloblastoma.Publication Microrna expression pattern modulates temozolomide response in gbm tumors with cancer stem cells(Springer/plenum Publishers, 2014-07-01) Preusser, Matthias; Berghoff, Anna Sophie; Ricken, Gerda; Tezcan, Gülçin; TEZCAN, GÜLÇİN; EGELİ, ÜNAL; Bekar, Ahmet; BEKAR, AHMET; KOCAELİ, HASAN; TUNCA, BERRİN; Tunca, Berrin; Çeçener, Gülşah; ÇEÇENER, GÜLŞAH; Budak, Ferah; BUDAK, FERAH; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Taşkapılıoğlu, Mevlüt Özgür; Tolunay, Şahsine; TOLUNAY, ŞAHSİNE; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Medikal Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Mikrobiyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Nöroşurji Anabilim Dalı.; 0000-0002-5956-8755; 0000-0002-1619-6680; 0000-0001-7904-883X; 0000-0002-3820-424X; 0000-0003-0388-7965; 0000-0001-7625-9148; 0000-0001-5472-9065; F-4657-2014; IZP-9398-2023; AAH-3843-2020; ABB-8161-2020; AAI-1612-2021; ABX-9081-2022; ABI-6078-2020; AAH-1420-2021; AAW-5254-2020; F-8554-2017; AAP-9988-2020Temozolomide (TMZ) is widely used to treat glioblastoma multiforme (GBM). Although the MGMT gene methylation status is postulated to correlate with TMZ response, some patients with a methylated MGMT gene still do not benefit from TMZ therapy. Cancer stem cells (CSCs) may be one of the causes of therapeutic resistance, but the molecular mechanism underlying this resistance is unclear. microRNA (miRNA) deregulation has been recognized as another chemoresistance modulating mechanism. Thus, we aimed to evaluate the miRNA expression patterns associated with chemoresistance that is dependent on the CSC status in GBM tumors to identify therapeutic biomarkers. CSCs were identified in 5 of 20 patients' tumor tissues using magnetic separation. CSC (+) tumors displayed a significant induction of CpG island methylation in the MGMT gene promoter (p = 0.009). Using real-time reverse transcription polymerase chain reaction (qRT-PCR), 9 miRNAs related to GBM (mir-181b, miR-153, miR-137, miR-145, miR-10a, miR-10b, let-7d, miR-9, and miR-455-3p), which are associated with cell cycle and invasion was analyzed in tumor samples. Low miR-181b and high miR-455-3p expression levels were detected (p = 0.053, p = 0.004; respectively) in CSC (+) tumors. Analysis revealed a significant correlation between miR-455-3p expression and Smad2 protein levels as analyzed by immunohistochemistry in CSC (+) tumors (p = 0.002). Thus, miR-455-3p may be involved in TMZ resistance in MGMT methylated CSC (+) GBM patients. Further studies and evaluations are required, but this miRNA may provide novel therapeutic molecular targets for GBM treatment and new directions for the development of anticancer drugs.Publication Olea europaea leaf extract improves the treatment response of GBM stem cells by modulating miRNA expression(E-century Publishing Corp, 2014-01-01) Tezcan, Gülçin; Tunca, Berrin; Bekar, Ahmet; Budak, Ferah; Şahin, Saliha; Çeçener, Gülşah; Egeli, Ünal; Taşkapılıoğlu, Mevlut Özgür; Kocaeli, Hasan; Tolunay, Şahsine; Malyer, Hulusi; Demir, Cevdet; Tümen, Gülendam; TEZCAN, GÜLÇİN; TUNCA, BERRİN; BEKAR, AHMET; BUDAK, FERAH; ŞAHİN, SALİHA; ÇEÇENER, GÜLŞAH; EGELİ, ÜNAL; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; KOCAELİ, HASAN; TOLUNAY, ŞAHSİNE; MALYER, HULUSİ; DEMİR, CEVDET; Tümen, Gülendam; Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Kliniği; Uludağ Üniversitesi/Tıp Fakültesi/Mikrobiyoloji Bölümü; Uludağ Üniversitesi/Tıp Fakültesi/Patholoji Bölümü; 0000-0002-5956-8755; 0000-0002-1619-6680; 0000-0001-7625-9148; 0000-0002-3820-424X; 0000-0001-7904-883X; 0000-0001-5472-9065; 0000-0002-9381-0410; ABA-2005-2020; F-8554-2017; ABX-9081-2022; AFR-1890-2022; F-4657-2014; AAH-3843-2020; AAI-1612-2021; ABI-6078-2020; IZP-9398-2023; AAW-5254-2020; AAP-9988-2020; AAH-2892-2021; ABB-8161-2020; AAH-1420-2021; ABI-6078-2020The stem-like cells of Glioblastoma multiforme (GBM) tumors (GSCs) are one of the important determinants of recurrence and drug resistance. The aims of the current study were to evaluate the anticancer effect of Olea europaea leaf extract (OLE) on GBM cell lines, the association between OLE and TMZ responses, and the effect of OLE and the OLE-TMZ combination in GSCs and to clarify the molecular mechanism of this effect on the expression of miRNAs related to cell death. The anti-proliferative activity of OLE and the effect of the OLE-TMZ combination were tested in the T98G, U-138MG and U-87MG GBM cell lines using WST-1 assay. The mechanism of cell death was analyzed with Annexin V/FITC and TUNEL assays. The effects of OLE on the expression levels of miR-181b, miR-153, miR-145 and miR-137 and potential mRNA targets were analyzed in GSCs using RT-qPCR. OLE exhibited anti-proliferative effects via apoptosis and necrosis in the GBM cell lines. In addition, OLE significantly induced the expression of miR-153, miR-145, and miR-137 and decreased the expression of the target genes of these miRNAs in GSCs (p < 0.05). OLE causes cell death in GBM cells with different TMZ responses, and this effect is synergistically increased when the cells are treated with a combination of OLE and TMZ. This is the first study to indicate that OLE may interfere with the pluripotency of GSCs by modulating miRNA expression. Further studies are required, but we suggest that OLE may have a potential for advanced therapeutic cancer drug studies in GBM.Publication Retrospective analysis of decompressive craniectomy performed in pediatric patients with subdural hematoma(Travma Acil Cerrahisi, 2019-07-01) Taşkapılıoğlu, Mevlüy Özgür; Özmarasalı, Ali İmran; Ocakoğlu, Gökhan; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; ÖZMARASALI, ALİ İMRAN; OCAKOĞLU, GÖKHAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahisi Anabilim Dalı; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Biyoistatistik Anabilim Dalı; 0000-0001-5472-9065; 0000-0002-7529-2808; 0000-0002-1114-6051; HLG-6346-2023; AAW-5254-2020; CAI-5927-2022; AAH-5180-2021; ABB-8161-2020BACKGROUND: The impact of decompressive craniectomy (DC) on the overall outcome of pediatric acute subdural hematoma patients has not been fully determined to date. In this paper, we aimed to investigate the role of decompressive craniectomy performed to treat traumatic subdural hematoma in patients from the pediatric age group.METHODS: We described our experience with DC in pediatric acute subdural hematoma patients and analyzed the outcomes.RESULTS: Eleven (7 unilateral and 4 bilateral) DCs were performed. The patients' ages ranged from 8 months to 15 years. The mean GCS score at admission was 7.8. All patients underwent DC with duraplasty within 2 hours of injury. All the patients were admitted to the intensive care unit for 10 days postoperatively. The mean hospital stay was 22 days and the mean follow-up period was 3.7 years.CONCLUSION: Early DC for pediatric subdural hematoma patients, independent of their initial GCS, was recommended. Larger studies are needed to define the indications, surgical techniques, and timing of DC in the pediatric population.Publication Short-term clinical outcomes of newborns who have neural tube defects(Galenos Yayincilik, 2018-01-01) ÇAKIR, SALİH ÇAĞRI; Dorum, Bayram Ali; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Özkan, Hilal; ÖZKAN, HİLAL; Taşkapılıoğlu, Özgür; Köksal, Nilgün; Toker, Rabia Tütüncü; TÜTÜNCÜ TOKER, RABİA; Okan, Mehmet Sait; OKAN, MEHMET SAİT; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Çocuk Sağlığı ve Hastalıkları Anabilim Dalı.; 0000-0001-5761-4757; 0000-0002-2823-8454; 0000-0001-5472-9065; 0000-0002-3129-334X; 0000-0002-9303-5768; A-5375-2017; ABB-8161-2020; AEZ-2469-2022; AAG-8393-2021; IZP-6290-2023; HJZ-4508-2023INTRODUCTION: Neural tube defects (NTD) are one of the most common congenital anomalies of the newborns. The incidence of NTD in Turkey is 3/1000. Various types of NTD appear depending on the part affected by the closure of the neural tube. The etiology of NTD is multifactorial, and a significant portion of them can be prevented by folic acid supplementation. Patients with NTD need long-term medical, surgical and care support.METHODS: In this study, antenatal, natal and postnatal characteristics of NTD patients who were admitted to the NICU between 2013-2017 were examined retrospectively.RESULTS: Twenty-nine NTD patients were included in this study. Sixteen (55%) of the patients were male and 13 (45%) were female. Mean gestational age was 37.5 +/- 1.97 weeks, mean birth weight was 3050 +/- 703.29 grams. Six patients had the following maternal risk factors for NTD development: diabetes, obesity, smoking, and the use of valproic acid. None of the patients used preconceptional folic acid. Of the NTD, 23 were meningomyelocele, 1 was meningocele, 3 were encephalomyelocele, 1 was encephalocele, and 1 was acrania. NTD was the most common at the lumbosacral region (n=10) and the other regions were lomber (n=8), thoracic (n=5), occipital (n=4) and cervical (n=1). While the complete loss of leg movements was seen in eleven of the patients, partial loss was seen in nine of them. The lesion level was higher than L4 in all of those with complete motor dysfunction and in 4 (44%) with partial motor dysfunction. Meningomyelocele sacs were ruptured in seven patients. Shunt procedures were required in 18 of 19 patients with hydrocephalus. Shunt placement and meningomyelocele operations were performed simultaneously in 11 patients.DISCUSSION and CONCLUSION: The preventable etiologic risk factors of NTDs should be known especially by the parents who are considering having a child.Publication Statistical shape analyses of the brainstem in chiari patients(Türk Nöroloji Derneği, 2021-01-01) Ocakoglu, Gokhan; OCAKOĞLU, GÖKHAN; Taskapilioglu, Mevlut Ozgur; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Altunyuva, Oguz; ALTUNYUVA, OĞUZ; Yilmazlar, Selcuk; YILMAZLAR, SELÇUK; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Nöroşirürji Anabilim Dalı.; 0000-0002-1114-6051; 0000-0001-5472-9065; 0000-0002-3450-0471; AAH-5180-2021; AAK-9899-2020AIM: To ascertain whether the brain stem's shape differs in patients with syrinx and without syrinx in cases with Chiari malformation Type I (CM-1), relative to healthy controls.MATERIAL and METHODS: Data on marked brainstem regions were obtained from 2D digital image files. Generalized Procrustes analysis was used to evaluate shape differences among patients with syrinx, patients without syrinx, and healthy controls. Shape deformations among groups were examined by Thin Plate Spline (TPS) analysis.RESULTS: According to the brain stem shape, there were differences between patients with syrinx and controls, and between patients without syrinx and controls. High-level deformations were also observed among the groups.CONCLUSION: In the present study, the presence of shape deformations in Chiari patients' brainstem was demonstrated. This is the first study using a landmark-based geometrical morphometric method to demonstrate the shape difference in Chiari patients' brainstem.Publication Statistical shape analysis of cerebellum in patients with chiari malformation I(Lippincott, 2019-09-01) Ocakoğlu, Gökhan; Baykal, Duygu; Altunyuva, Oğuz; Taşkapılıoğlu, Mevlüt Özgür; Yılmazlar, Selçuk; OCAKOĞLU, GÖKHAN; ALTUNYUVA, OĞUZ; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; YILMAZLAR, SELÇUK; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Biyoistatistik Anabilim Dalı; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahi Anabilim Dalı; 0000-0003-3633-7919; 0000-0002-3450-0471; 0000-0001-5472-9065; ABB-8161-2020; AAW-5254-2020; HLG-6346-2023; AAH-5180-2021; AAK-9899-2020; AAH-5070-2021The surgical procedure is viewed as a typical treatment choice for patients with Chiari malformation (CM). Decompression is the preferred method for surgery, but it is not always possible to understand whether decompression has been successful especially in an early period. The present study focuses on investigating the shape differences in the cerebellums of Chiari patients compared with healthy controls, and to assess the clinical application of this situation whether if present. The MRI scans were reviewed retrospectively. Cerebellar data were obtained from the digital images and 9 anthropometric landmarks were marked on each image. Shape difference was assessed by performing Generalized Procrustes analysis. The cerebellar shape deformation from control to the patient was evaluated performing the Thin Plate Spline approach. There is a statistically significant cerebellar shape difference between groups. Highest deformation was determined at the cerebellar tonsillar inferior area, posterior of the uvula, and anterior of inferior medullary velum. The present study demonstrated cerebellar shape differences in CM I patients using a landmark-based geometric morphometric approach, considering the topographic distribution of cerebellum for the first time.Publication Surgery of cranial deformity following ventricular shunting: A multicenter study(Turkish Neurosurgical Society, 2023) Gezer, Burak; Taşkapılıoğlu, Mevlüt Özgür; Zaimoğlu, Murat; Moralı Güler, Tuba; Kahıloğulları, Gökmen; Karabağlı, Hakan; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin ve Sinir Cerrahisi; IRO-2619-2023AIM: To review the cases of craniosynostosis secondary to ventricular shunting procedure.MATERIAL and METHODS: We retrospectively evaluated the medical records of all pediatric patients with hydrocephalus who were treated with ventriculoperitoneal shunt procedure between the years 2017 and 2021 at the Selcuk University, Ankara University, and Bursa Uludag University.RESULTS: Twenty-one patients were included in the study. The median age at the time of insertion of ventriculoperitoneal shunt for hydrocephalus was 8.1 (range, 1-22) months. Seven patients were shunted because of congenital hydrocephalus. The mean time to development of secondary synostosis was 8.8 (range, 1-36) months. Plagiocephaly was the most common type of secondary synostosis. While shunt revision was performed in 16 patients, cranial vault expansion surgery was performed in 5 patients.CONCLUSION: Slit ventricle syndrome is a frequent condition at shunted patients, but there is no consensus on identifying patients who require treatment. Using programmable or high-pressure valves, performing cranial vault modeling are possible treatment modalities. Increased awareness of this condition in follow-up may allow early diagnosis and intervention and prevent it from evolving into more serious deformities.Publication Targeting Mfsd2a in hemorrhagic cerebrovascular diseases(Springer, 2022-03-29) Eser, Pınar; Taşkapılıoğlu, Mevlüt Özgür; Kocaeli, Hasan; Eser, Pınar; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; KOCAELİ, HASAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahisi Anabilim Dalı; 0000-0003-0132-9927; 0000-0001-5472-9065; AAI-2073-2021; FDK-3229-2022Publication The evaluation of survivin and bcl-2 expression on the medical radiation doses for neural tube defect development(Türk Nöroloji Derneği, 2021-01-01) Adilay, Huseyin Utku; Katar, Salim; Güçlü, Bülent; Altun, Eren; Ozdek, Recep; Tiryaki, Mehmet; Bekar, Ahmet; Taşkapılıoğlu, Mevlüt Özgur; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Bursa Uludağ Üniversitesi/Tıp Fakültesi.; 0000-0001-5472-9065; 0000-0001-9110-8364; 0000-0002-2646-1775; ITU-7284-2023; P-1338-2019; ABX-9081-2022AIM: To investigate the effects of different radiation doses on the development of the neural tube defect in chick embryos using computed tomography (CT), and assess its correlation with survivin and Bcl-2 expressions.MATERIAL and METHODS: A total of 150 chicken eggs were used and grouped into five categories. In Group 1 (n=30), the embryos were not exposed to radiation. In Group 2 (n=30), the embryos were irradiated using lung cancer screening chest CT protocol. In Groups 3 and 4 (n=30 each), the abdominopelvic and adult routine head CT protocols, respectively, were used to irradiate the embryos. In Group 5 (n=30), the embryos were irradiated using adult brain perfusion CT protocol. Subsequently, the embryos were examined under a stereomicroscope to assess the presence of neural tube developmental abnormalities. Moreover, immunohistochemical staining was performed to determine the survivin and Bcl-2 expression levels.RESULTS: The risk of developing neural tube defect increased with the amount of exposed radiation. Moreover, no significant correlation was observed between the survivin and Bcl-2 expression levels and the radiation dose.CONCLUSION: Overall, the results of this study indicate that the radiation from CT may cause neural tube defect in chicken embryos.