The Effect of the ABCB1(MDR-1) C3435T Polymorphism in Turkish Patients with Aspirin Resistance in Acute Ischemic Stroke.

Recurrence of thrombotic events during aspirin therapy is known as aspirin resistance (AR). This study aimed to investigate the rate of AR, the factors influencing AR in patients with acute ischemic stroke under regular aspirin use, and the relationship between AR and ABCB1 (MDR-1) C3435T (rs1045642) polymorphism. Throughout this multicenter prospective study, 174 patients with acute ischemic stroke who had been prescribed aspirin for at least one month due to the risk of vascular disease, along with 106 healthy volunteers, were included as part of the study group. The results of our study indicate that AR was detected in 21.3% of the patient group. According to the results of an analysis of the polymorphism of the ABCB1 C3435T in patients with AR compared to those with aspirin sensitivity, patients with AR possessed more heterozygous (CT) and homozygous genotypes (TT) than those with aspirin sensitivity (p = 0.001). Based on multivariate logistic regression analysis of factors affecting AR in acute ischemic stroke patients, hypertension (OR: 5.679; 95% CI: 1.144-28.19; p = 0.034), heterozygous (CT) genotype (OR: 2.557; 95% CI: 1.126-5.807; p = 0.025), increased platelet values (OR: 1.005; 95% CI: 1.001-1.009; p = 0.029), and CRP/albumin values (OR: 1.547; 95% CI: 1.005-2.382; p = 0.047) were found to be associated with a greater risk of AR. The presence of heterozygous (CT) genotype in the ABCB1 C3435T gene region in the Turkish population is associated with an increased risk of AR. When planning aspirin therapy, it is crucial to consider the ABCB1 (MDR-1) C3435T polymorphism.

Quantification of cell-free circulating mitochondrial DNA copy number variation in hepatocellular carcinoma.

OBJECTIVE: Hepatocellular carcinoma is the most common primary malignant liver tumor. Mitochondrial DNA copy number has been shown to be associated with various malignancies. However, there has not been any study on the absolute quantification of mtDNA copy number in hepatocellular carcinoma. The aim of this study was to develop a new method for absolute quantification of mtDNA copy number and to relatively quantify the variations in the mtDNA copy number in hepatocellular carcinoma patients in comparison with healthy individuals. METHODS: Venous blood samples were collected from both hepatocellular carcinoma patients (34) and healthy individuals (34). Circulating cell-free DNAs were isolated and the relative quantification of mtDNA copy number variation was determined using quantitative polymerase chain reaction and digital polymerase chain reaction. RESULTS: It was found that the relative mtDNA copy number was significantly decreased in hepatocellular carcinoma patients in comparison with the control group (p<0.05). The median (range) and average of relative mtDNA/ß-actin gene of the patients were determined as 42.8 cp/µL (11.1-88.5) and 45.1 cp/µL, respectively, while the median (range) and average relative mtDNA/ß-actin gene of the control group were determined as 102.8 cp/µL (55.1-291.8) and 138.7 cp/µL, respectively (p<0.05). When quantitative polymerase chain reaction and digital polymerase chain reaction were compared, mtDNA/ß-actin gene copy number ratio of digital polymerase chain reaction results was found to be 1.76-fold more than that of quantitative polymerase chain reaction results. CONCLUSION: Circulating mtDNA copy number was decreased in hepatocellular carcinoma patients in comparison with healthy individuals, and we suggest that it can be used as a noninvasive biomarker for hepatocellular carcinoma diagnosis in the future.

Role of mir-33a, mir-203b, mir361-3p, and mir-424 in hepatocellular carcinoma

Background/aim: Hepatocellular carcinoma (HCC) is one of the most aggressive cancer types. MicroRNAs (miRNAs) are small noncoding regulatory RNAs that function posttranscriptionally. miRNA deregulation was observed in the development and progression of HCC. In this study, we aimed to investigate the expression levels of four miRNAs (mir-33a, mir-203b, mir361-3p, and mir-424) in HCC patients in comparison to healthy individuals. Materials and methods: Venous blood samples were collected from both HCC patients and healthy individuals. In order to determine the relative expression levels of mir-33a, mir-203b, mir361-3p, and hsa-mir-424 in HCC patients, probe-based quantitative real time PCR (qRT-PCR) was performed. The cycle threshold (Ct) results were analyzed according to the 2−∆∆Ct method and statistical analyses were performed by SPSS Statistics version 15 for Windows. Results: qRT-PCR analysis revealed that the expression levels of mir-33a (fold change: 7.3 and P < 0.001), mir-203b (fold change: 4.6 and P < 0.001), and mir361-3p (fold change: 5.1 and P < 0.001)were downregulated compared to healthy individuals and mir-424 did not show any significant change between HCC patients and controls. Conclusion: Our results indicated that mir-33a, mir-203b, and mir-361-3p may significantly contribute to tumor pathogenesis in HCC and have potential to be used as a noninvasive biomarker for cancer therapy.

Composition of the essential oil of Satureja metastasiantha: a new species for the flora of Turkey.

The aerial parts of Satureja metastasiantha were hydrodistilled for 3 h using a Clevenger-type apparatus. The essential oils were analyzed by gas chromatography/flame ionization detector and gas chromatography/mass spectrometry, simultaneously, the main compounds of which were characterized as p-cymene (22.3%), thymol (21.0%), carvacrol (18.4%), and γ-terpinene (12.1%). Antioxidant capacity, acetylcholinesterase and butyrylcholinesterase inhibition effects, and antimicrobial and antifungal properties of the species were evaluated. The anticholinesterase activity of the essential oil of S. metastasiantha was observed with 30% inhibition at 200 µg/mL. The essential oil of the species showed activity against Staphylococcus aureus with 128 µg/mL minimum inhibitory concentration value.

Tumor suppressor and oncogenic role of long non-coding RNAs in cancer.

Non-coding RNAs are RNA molecules that are not translated into the protein, making up the vast majority of the human genome. Long non-coding RNAs (lncRNA) are in the RNA group that has longer than 200 nucleotides, and non-protein coding transcripts. In recent years, the potential has attracted considerable attention as new important biological regulators. LncRNAs play a critical role in regulating the activity and localization of proteins, processing the production of small RNAs, and processing other RNAs. They are also involved in cell differentiation, cell cycle, proliferation, apoptosis, migration and invasion by modulation of gene expression. Abnormal expression of LncRNAs has an important role in the function of oncogenes and tumor suppressor genes. Recently, there has been an increasing number of studies on the tumorigenic effects of specific lncRNAs in the initiation and progression of cancer. In this review, general information about lncRNAs is provided, including the biological importance of lncRNAs in cancer diseases and their potential development in therapeutic applications.

Comparison of Volumetric and Bead-Based Counting of CD34 Cells by Single-Platform Flow Cytometry.

BACKGROUND: Over 2,000 people a year in the United Kingdom need a bone marrow or blood stem cell transplant. It is important to accurately quantify the hematopoietic stem cells to predict whether the transplant will be successful in replenishing the immune system. However, they are present at low frequency, which complicates accurate quantification. The current gold standard method is single-platform flow cytometry using internal reference counting beads to determine the concentration of CD34 cells. However, volumetric flow cytometers have the ability to measure the acquisition volume, which removes the need for reference beads for calculation of cell concentrations. METHOD: In this study, we compared both methods for calculating CD34 cell concentrations in volumetric cytometers, using either the volume reading or the number of reference beads for calculation. In addition, the uncertainty of measurement for each method was estimated. RESULTS: The results show that both methods have similar uncertainties of measurement. Regression analysis showed low to no statistical difference in CD34 cell concentrations obtained with each method. CONCLUSIONS: Overall, this study suggests that the volumetric method is a valid approach but that the adoption of this technology may be hindered without some form of external calibration of volume readings to increase confidence in the measurement. © 2019 The Authors. Cytometry Part B: Clinical Cytometry published by Wiley Periodicals, Inc. on behalf of International Clinical Cytometry Society.

Screening of Hallucinogenic Compounds and Genomic Characterisation of 40 Anatolian Salvia Species.

INTRODUCTION: Salvia, an important and widely available member of Lamiaceae family. Although comparative analysis on secondary metabolites in several Salvia species from Turkey has been reported, their hallucinogenic chemicals have not been screened thoroughly. OBJECTIVE: This study provides LC-MS/MS analysis of 40 Salvia species for screening their psychoactive constituents of salvinorin A and salvinorin B. 5S-rRNA gene non-coding region of Salvia plants was sequenced, aligned and compared with that sequence of Salvia divinorum plant. METHODOLOGY: Targeted molecules of salvinorin A and salvinorin B were quantified, using LC-MS/MS, from all aerial parts of 40 Salvia species, collected from different parts of Turkey. Regions of 5S-rRNA gene from different species were amplified by polymerase chain reaction and DNA sequences were aligned with Salvia divinorum DNA sequences. RESULTS: Very few of the Salvia species (S. recognita, S. cryptantha and S. glutinosa) contained relatively high levels of salvinorin A (212.86 ± 20.46 µg/g, 51.50 ± 4.95 µg/g and 38.92 ± 3.74 µg/g, respectively). Salvinorin B was also found in Salvia species of S. potentillifolia, S. adenocaulon and S. cryptantha as 2351.99 ± 232.22 µg/g, 768.78 ± 75.90 µg/g and 402.24 ± 39.71 µg/g, respectively. The sequences of 5S-rRNA gene of 40 different Salvia species were presented and it was found that none of the Salvia species in Turkey had similar DNA sequence to Salvia divinorum plant. CONCLUSION: This is the first report of screening 40 Salvia species in Turkey according to their psychoactive constituents, salvinorin A and salvinorin B and their genomic structures. It is possible that some of these Salvia species may exhibit some psycho activity. Thus, they need to be screened further. Copyright © 2017 John Wiley & Sons, Ltd.

Comparison of DNA extraction methods for meat analysis.

Preventing adulteration of meat and meat products with less desirable or objectionable meat species is important not only for economical, religious and health reasons, but also, it is important for fair trade practices, therefore, several methods for identification of meat and meat products have been developed. In the present study, ten different DNA extraction methods, including Tris-EDTA Method, a modified Cetyltrimethylammonium Bromide (CTAB) Method, Alkaline Method, Urea Method, Salt Method, Guanidinium Isothiocyanate (GuSCN) Method, Wizard Method, Qiagen Method, Zymogen Method and Genespin Method were examined to determine their relative effectiveness for extracting DNA from meat samples. The results show that the salt method is easy to perform, inexpensive and environmentally friendly. Additionally, it has the highest yield among all the isolation methods tested. We suggest this method as an alternative method for DNA isolation from meat and meat products.

The use of digital PCR to improve the application of quantitative molecular diagnostic methods for tuberculosis.

BACKGROUND: Real-time PCR (qPCR) based methods, such as the Xpert MTB/RIF, are increasingly being used to diagnose tuberculosis (TB). While qualitative methods are adequate for diagnosis, the therapeutic monitoring of TB patients requires quantitative methods currently performed using smear microscopy. The potential use of quantitative molecular measurements for therapeutic monitoring has been investigated but findings have been variable and inconclusive. The lack of an adequate reference method and reference materials is a barrier to understanding the source of such disagreement. Digital PCR (dPCR) offers the potential for an accurate method for quantification of specific DNA sequences in reference materials which can be used to evaluate quantitative molecular methods for TB treatment monitoring. METHODS: To assess a novel approach for the development of quality assurance materials we used dPCR to quantify specific DNA sequences in a range of prototype reference materials and evaluated accuracy between different laboratories and instruments. The materials were then also used to evaluate the quantitative performance of qPCR and Xpert MTB/RIF in eight clinical testing laboratories. RESULTS: dPCR was found to provide results in good agreement with the other methods tested and to be highly reproducible between laboratories without calibration even when using different instruments. When the reference materials were analysed with qPCR and Xpert MTB/RIF by clinical laboratories, all laboratories were able to correctly rank the reference materials according to concentration, however there was a marked difference in the measured magnitude. CONCLUSIONS: TB is a disease where the quantification of the pathogen could lead to better patient management and qPCR methods offer the potential to rapidly perform such analysis. However, our findings suggest that when precisely characterised materials are used to evaluate qPCR methods, the measurement result variation is too high to determine whether molecular quantification of Mycobacterium tuberculosis would provide a clinically useful readout. The methods described in this study provide a means by which the technical performance of quantitative molecular methods can be evaluated independently of clinical variability to improve accuracy of measurement results. These will assist in ultimately increasing the likelihood that such approaches could be used to improve patient management of TB.