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Öğe Are intervertebral disc tissue cells damaged when attempting to prevent thrombus formation using dabigatran, a new oral anticoagulant?(Turkish Neurosurgical Society, 2019) Kaplan, Necati; Karaaslan, Numan; Yılmaz, İbrahim; Yaşar Şirin, Duygu; Akgün, Feride Sinem; Çalışkan, Tezcan; Şimşek, Abdullah Talha; Özbek, HanefiAIM: To investigate the effect of dabigatran, a new oral anticoagulant, on human primary cell cultures isolated from intact intervertebral disc tissue. MATERIAL and METHODS: Cell cultures were prepared from tissues obtained from six cases who had undergone surgery due to spinal trauma. Dabigatran, an active pharmacological agent, was applied to intact annulus fibrosus (AF)/nucleus pulposus (NP) primary cell cultures from the study group. After performing cell viability, toxicity, and proliferation tests on all cultures in the control and study groups, the surface morphologies of the samples were evaluated. Subsequently, chondroadherin (CHAD), cartilage oligomeric matrix protein (COMP), and matrix metalloproteinase (MMP)-13 and -19 expressions were measured via a real-time polymerase chain reaction (RT-PCR). Data were analyzed statistically. RESULTS: In the proliferation assays performed on the 20th day of the study, cells in the dabigatran-supplemented group were reported to have lost 46.37% more viability than those in the control group. Expressions of all genes examined except MMP-13 were evaluated in the control group by time, but in contrast to the control group results, COMP and MMP-19 gene expressions decreased in the dabigatran-treated group. No CHAD or MMP-13 expression was noted in these cultures. CONCLUSION: The potential for a systemically applied drug to accumulate in tissue and negatively affect surrounding tissues and microstructures must be emphasized.Öğe Delivering growth factors through a polymeric scaffold to cell cultures containing both nucleus pulposus and annulus fibrosus(Turkish Neurosurgical Society, 2019) Akyuva, Yener; Kaplan, Necati; Yılmaz, İbrahim; Özbek, Hanefi; Yaşar Şirin, Duygu; Karaaslan, Numan; Güler, Olcay; Ateş, ÖzkanAIM: To design a novel, polyvinyl alcohol (PVA)-based polymeric scaffold that permits the controlled release of insulin-like growth factor 1 (IGF-1) /bone morphogenetic protein (BMP)-2 following intervertebral disc administration. MATERIAL and METHODS: The drug delivery system was composed of two different solutions that formed a scaffold within seconds of coming into contact with each other. Swelling, pH, and temperature tests and analysis of the controlled release of growth factors (GFs) from this system were performed. The release kinetics of the GFs were determined through enzyme-linked immunosorbent assay (ELISA). Cell proliferation and viability were monitored with microscopy and analyzed using an MTT assay and acridine orange/propidium iodide (AO/PI) staining. Chondroadherin (CHAD), hypoxia inducible factor-1 alpha (HIF-1 alpha), and collagen type II (COL2A1) gene expressions were determined with quantitative real-time polymerase chain reaction (qRT-PCR) analysis to show the effects of IGF-1/BMP-2 administration on annulus fibrosus cell (AFC)/nucleus pulposus cell (NPC) cultures. For the statistical evaluation of the obtained data, experimental groups were compared with a post hoc Tukey's test following an analysis of variance. RESULTS: The scaffold allowed for the controlled release of IGF-1 and BMP-2 in different time intervals. It was observed that as the application time increased, the number of cells and the degree of extracellular matrix development increased in AFC/NPC cultures. AO/PI staining and an MTT analysis showed that cells retained their specific morphology and continued to proliferate. It was observed that HIF-1 alpha and CHAD expression increased in a time-dependent manner, and no COL2A1 expression in the AFC/NPC cultures was observed. CONCLUSION: The designed scaffold may be used as an alternative method for intervertebral disc administration of GFs after further in vivo studies. Such prototype scaffolds may be an innovative technology in targeted drug therapies after reconstructive neurosurgical interventions.Öğe Evaluation of the effect of daptomycin, a glycopeptide agent, on intact intervertebral disc tissue(Turkish Neurosurgical Society, 2019) Kaplan, Necati; Yılmaz, İbrahim; Karaaslan, Numan; Yaşar Şirin, Duygu; Şimşek, Abdullah Talha; Çalışkan, Tezcan; Bircan, Rıfat; Özbek, HanefiAIM: To evaluate the effects of pre- and intra-operatively administered daptomycin (DAP) on the intact human primary intervertebral disc tissue cells. MATERIAL and METHODS: Primary cell cultures were established using tissues obtained through decompressive laminectomy, traumatic intervertebral disc herniation excision, and posterior transpedicular stabilization. Non-drug-administered samples were used as a control group. The samples treated with DAP formed the study group. Molecular assays for proliferation and gene expression were performed. The obtained data were evaluated statistically, and results with a value of p<0.05 were accepted as significant. RESULTS: While no reduction was observed in the proliferation, the gene expression of intact intervertebral disc tissue cells was time-dependently decreased compared to the control group, and these results were reported to be statistically significant. CONCLUSION: This study observed the effect that a pharmaceutical preparation, which was used on intervertebral disc tissue before and after the operation, had on normal, healthy, and intact tissue. It concludes that alterations in the expression of genes involved in the anabolic and/or catabolic process, even in adjacent healthy tissue, may slow down the healing process of the damaged tissue or cause undesired cell differentiation.Öğe Is it possible to treat osteosarcoma using oligonucleotides confined into controlled release drug delivery systems?(Bentham Science Publishers Ltd, 2017) Topuk, Savaş; Akyuva, Yener; Karaaslan, Numan; Mutlu, Çağri Ata; Yılmaz, İbrahim; İşyar, Mehmet; Şirin, Duygu Yaşar; Akkaya, Semih; Özbek, Hanefi; Mahiroğulları, MahirPurpose: The present study aimed to analyze the researches that are at the experimental phase concerning osteosarcoma treatment. The researches included drug delivery systems which allow controlled release and imbue small interfering-/micro-ribonucleic acid. Methods: Without any language preference, we searched US National Library of Medicine National Institutes of Health, Embase, OVID, Cochrane Library database of clinical trials from 1843 to May 25, 2016 and traced all the references of incorporated documents. The data were evaluated using descriptive statistics and the results are shown as frequency (%). Results: We haven't encountered any drug delivery system in which Small interfering ribonucleic acid/ micro ribonucleic acid oligonucleotides were embedded successfully against osteosarcoma. There has been only one research in which hairpin-ribonucleic acid was embedded. Conclusion: It was considered that drug delivery system enabling controlled oligonucleotide release in the treatment period of osteosarcoma was not projected for the clinical use. However, it cannot be neglected that the mentioned experimental studies with regard to osteosarcoma treatment establish the basis of target therapies. The method in question looks promising regarding effective treatment of osteosarcoma in the future.Öğe The effects of NLR on the diagnosis and pharmacological management of brain abscesses(Alanya Alaaddin Keykubat University, 2021) Çalışkan, Tezcan; Yılmaz, İbrahim; Hacıoğlu Kasım, Fatma Bahar; Ersöz, Emel; Doğan, Mustafa; Karaaslan, NumanAim: The present study aims to examine the effectiveness of the neutrophil-tolymphocyte ratio in the treatment and diagnosis of patients with brain abscesses. Methods: In this retrospective study, radiological, neurological, and surgical data obtained from the medical records of healthy volunteers (n = 10) who presented to the hospital for check-ups and patients with brain abscesses who were treated (n = 10) were evaluated statistically. Alpha significance value was accepted as <0.05. Results: Comparisons between groups revealed that the erythrocyte sedimentation rate, C-reactive protein, leukocyte, and neutrophil values were statistically significant (P <0.05) while lymphocyte value was not statistically significant (P >0.05). The preoperative neutrophil-to-lymphocyte ratio in cases diagnosed with brain abscesses showed statistical significance compared to that in the healthy volunteers (P <0.05) and the neutrophil-to-lymphocyte ratio increased 3.31-fold in the study group compared to the healthy volunteers. Conclusion: A strong positive strong relationship between the neutrophil-tolymphocyte ratio and abscess size (r = 0.662; P = 0.037) was observed. An increased neutrophil-to-lymphocyte ratio may serve as an early warning signal of brain abscesses.
