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Öğe The functional role of HMGB1/TLR4/NF-KB signalling pathway in multiple sclerosis(Nova Science Publishers, Inc., 2022) Uluc, Firdevs; Bozat, Bihter Gokce; Karabork, Seyda; Aydin-Turkoglu, SuleMultiple sclerosis (MS) is a chronic autoimmune demyelinating disorder of the central nervous system (CNS) defined by features such as axonal loss, glial cell activation, and immune cell infiltration. To date, the molecular mechanism underlying inflammation and immune response in MS pathogenesis has not been fully understood. Elucidation of the existing pathogenic mechanism is crucial for the development of effective treatment options for this disease. High Mobility Group Box 1 (HMGB1) protein is a proinflammatory-like cytokine protein that has an initiating role in neuroinflammation in triggering MS. In recent years, HMGB1 and its related signaling pathways have become a therapeutic target in experimental and clinical MS studies. In particular, HMGB1/TLR4/ NF-?B signaling pathway has an increasing importance. The main goal of this chapter is to explain the effects of HMGB1/TLR4/NF-KB signaling pathway in MS pathophysiology, which enhancing the release of proinflammatory cytokines and causes an inflammatory response. In order to develop effective treatment strategies in MS in the future, this chapter aims to explain the mechanism of HMGB1-induced neuroinflammation. © 2023 by Nova Science Publishers, Inc. All rights reserved.Öğe Impact of Storage Time of Fresh Serum Samples on Rapid Test Results of HBsAg(Galenos Yayincilik, 2014) Mengeloglu, Zafer; Bucak, Ozlem; Kocoglu, Esra; Tas, Tekin; Karabork, SeydaObjective: Rapid tests, amongst the methods used in the diagnosis of hepatitis B virus infection, detect hepatitis B surface antigen (HBsAg). It is important to know whether the elapsed time between sample collection and the process has negative impact on the test results. It was aimed to evaluate the impact of samples stored either at room temperature (RT) or at +4 degrees C for different durations on rapid test results. Materials and Methods: A total of 51 serum samples were used. HBsAg tests were performed at the time the samples arrived at our laboratory using chemiluminescence method. 21 samples positive for HBsAg were accepted as the study group, and 30 negative samples were the controls. All the samples were tested immediately using rapid assay. Then the samples were divided into two aliquots and divided again into two groups; the first group was stored at RT, and the second was stored at +4 degrees C. Two or three hours after the first tests, all the samples were tested again using rapid assay, and then, they were continued to be stored; and after 24 hours, the tests were repeated for the third time. Test results were scored between negative and +++. Results: In the initial rapid tests, the sensitivity rate was 85.7%, and the specificity was 100%. A statistically significant association was found between the positivity grades and the mean HBsAg levels (p<0.001; r=0.831). The accuracy was found to be 96.1% (49/51) for the second hour tests in terms of positivity grades. It was observed that the accuracy rate was decreased to 84.3% (43/51) in samples stored for 24 hours in both conditions, and positivity grades of eight samples were decreased for one degree for each. Amongst all tests, no false negative and false positive results were obtained according to the initial tests. In addition, it was found that all the results of the samples stored either at RT or +4 degrees C overlapped, and that the difference was caused just by the duration of storage. Conclusion: In conclusion, sera should not be stored for long time in cases they will be tested using HBsAg rapid assays, and storage of the samples for one day decrease the reliability of the results.Öğe Investigating the Relationship Between HBV DNA Levels and HBV Serological Markers(Galenos Yayincilik, 2013) Kocoglu, Esra; Tas, Tekin; Mengeloglu, Firat Zafer; Karabork, Seyda; Ceylan, KubraObjective: In this study, it is aimed to investigate the relationship between the HBV DNA positivity and serological markers such as HBsAg, HBeAg and anti-HBe in patients with acute or chronic hepatitis. Materials and Methods: Data of 574 patients whose serum specimens were processed in microbiology laboratory between march 2010 and july 2012 were retrospectively analysed. Results: In the study, HBV DNA was detected in 44.8% of HBsAg-positive, in 67.1% of HBeAg-positive and in 35.9% of anti-HBE-positive patients. HBV DNA was detected in 61.2% of the patients both of whose HBsAg and HBeAg were positive. However, HBV DNA was positive in one of 29 patients (3.4%) who had negativity of both HBsAg and HBeAg. DNA positivity was 6.3% in HBsAg-negative patients and 37.7% in HBeAg-negative ones. In the study, HBeAg was negative in 79.4% of HBV DNA-positive patients; anti-HBeAg was negative in 17.7% of DNA-positive patients. DNA levels were found significantly high in HBeAg-positive patients (p<0.001) as well as DNA levels were significantly high in anti-HBenegative ones (p<0.001). Conclusion: In conclusion, serological markers may be insufficient either in diagnosis of HBV infection or in determining the viral replication. In this study, it is observed that evaluating those tests together is useful in laboratory diagnosis.Öğe Is increased activator protein 1 in cerebrospinal fluid as a potential biomarker that distinguishes idiopathic intracranial from sclerosis?(Aepress Sro, 2024) Karabork, Seyda; Celik, Humeyra; Dursun, Ali Dogan; Ankarali, Handan; Turkoglu, Sule AydinOBJECTIVES: To distinguish whether idiopathic intracranial hypertension (IIH) is a condition predisposing to multiple sclerosis (MS) or an isolated disease, the current gene transcription factor Activator Protein -1 (AP -1) was evaluated with its potential to differentiate both diseases. BACKGROUND: The aim of this study was to investigate the use of AP -1 as biomarkers for the discrimination of IIH and MS. METHODS: AP -1, TNF-alpha, and IL -6 protein values in the CSF of the cases were evaluated by the ELISA method. The numerical measures of the groups and the ability of AP -1 to distinguish the groups were analyzed with the ROC curve. RESULTS: There was no difference between the groups in CSF TNF-alpha, IL -6, CSF, and serum biochemistry analyses. However, it was determined that the AP -1 concentration (pg/ml) was significantly higher in the IIH group, the sensitivity of AP -1 in separating those with IIH was 75%, and the specificity in separating those with MS was 60% in those with an AP -1 concentration of 606.5 and above. CONCLUSION: According to our results, the fact that CSF TNF-alpha and IL -6 values did not differ in IIH compared to MS revealed that IIH could not methodologically control MS, and AP -1 was a supportive parameter in differentiating both diseases (Tab. 2, Fig. 1, Ref. 31) . Text in PDF www.elis.skÖğe Performance of Rapid Test in Detection of Anti-HCV in Frozen Sera(Galenos Yayincilik, 2014) Mengeloglu, Zafer; Bucak, Ozlem; Kocoglu, Esra; Tas, Tekin; Karabork, SeydaObjective: Hepatitis C is a common infectious disease throughout the world. Rapid test of hepatitis C, detecting anti-HCV, is a useful test that is easy to perform as well as it may have lack of sensitivity and specificity. In the present study, it was aimed to investigate whether the rapid test of HCV infection can still reveal accurate results in anti-HCV-positive sera frozen for a few years. Materials and Methods: Sera of a total of 100 patients that were determined to be positive for anti-HCV using chemiluminescence technology system (Architect i2000sr, IL, USA) were stored at -200 degrees C for a maximum period of 3.5 years. The sera were thawed and tested again for anti-HCV using the Nanosign rapid test kit (Bioland, Korea) for HCV infection. Results: The positivity rate of the test was 37%. In addition, the rapid test revealed a very low positivity rate as 5.2% in sera with a level of anti-HCV below 10.0 S/CO. In contrast, the positivity rate was 71.4% in samples with high anti-HCV levels. A significant positive correlation was found between positivity levels and anti-HCV levels (r=0.708, p<0.001). No correlation was found between positivity levels and time passed after freezing the samples (r=-0.91, p=0.367). Besides this, no significant difference was observed amongst the groups in terms of the time intervals of freezing (p>0.05). Conclusion: The findings of this study suggest that the rapid test of HCV infection is not reliable in frozen sera with low anti-HCV levels due to the instability of the molecules in the samples, and the time passed after freezing of the sample doesn't change the results of the tests.
