Publications by authors named "Dalan A"

Introduction: Idiopathic pulmonary fibrosis (IPF) affects the tissue surrounding the alveoli and occurs when the lung tissue becomes thick and stiff for unknown reasons. Clinical findings are fairly well settled, but the molecular mechanisms of IPF are still poorly known.

Materials And Methods: To further our understanding, we collected publicly available transcriptome dataset from IPF cohorts, grouped them according to sampling method [bronchoalveolar lavage (BAL), biopsy, blood], and performed comparative meta-transcriptome study to (I) unravel key pathways (II), set out differences in discovered genes, pathways, and functional annotation with respect to the sampling method, and (III) find biomarkers for early diagnosis.

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Cancer treatment resistance is a caused by presence of various types of cells and heterogeneity within the tumor. Tumor cell-cell and cell-microenvironment interactions play a significant role in the tumor progression and invasion, which have important implications for diagnosis, and resistance to chemotherapy. In this study, we develop 3D bioprinted in vitro models of the breast cancer tumor microenvironment made of co-cultured cells distributed in a hydrogel matrix with controlled architecture to model tumor heterogeneity.

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Breast cancer is the most frequently diagnosed cancer among women worldwide. Despite the initial clinical response obtained with the widely used conventional chemotherapy, an improved prognosis for breast cancer patients has been missing in the clinic because of the high toxicity to normal cells, induction of drug resistance, and the potential immunosuppressive effects of these agents. Therefore, we aimed to investigate the potential anti-carcinogenic effect of some boron derivatives (sodium pentaborate pentahydrate (SPP) and sodium perborate tetrahydrate (SPT)), which showed a promising effect on some types of cancers in the literature, on breast cancer cell lines, as well as immuno-oncological side effects on tumor-specific T cell activity.

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For limiting the coronavirus disease-2019 (COVID-19) pandemic, the effects on both humoral and cellular immune responses due to vaccines and previous infection should be taken into consideration. In some of the studies about the humoral immune response of the virus and different vaccines, it has been suggested that there can be a discordance between cellular and humoral immune responses during COVID-19 infection. The aim of this study was to determine the effects of humoral and cellular immune responses against severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) antigens in three groups of healthcare workers (HCWs) who were vaccinated with two doses of inactivated virus vaccine (CoronaVac), non-vaccinated and recovered COVID-19 infection and non-infected healthy controls by comparing the variables of gender and age and to examine the relationships between them.

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The CoronaVac vaccine is an inactivated type two-dose regimen vaccine developed and manufactured by Sinovac Life Sciences Company, in China. It has already been used in China's vaccination program, while 21 other countries (including Indonesia, Turkey and Brazil) also granted emergency use authorization for this vaccine. In Turkey, on January 14, 2021, healthcare workers (HCWs) started to be vaccinated with CoronaVac as the priority group in vaccination.

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Purpose: The present study aims to investigate the potential role of Kallikrein 10 (KLK10) genotype and allele frequencies in predisposition to prostate cancer.

Materials And Methods: KLK10 (rs7259451) gene polymorphisms were determined by real-time polymerase chain reaction analysis in patients with prostate cancer (n=69) and controls (n=76).

Results: KLK10 gene frequencies were significantly different in the case and control groups (P = .

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Background/aim: Left ventricular hypertrophy (LVH) involves increased muscular mass of the left ventricle due to increased cardiomyocyte size and is caused by cardiomyopathies. Several microRNAs (miRNAs) have been implicated in processes that contribute to heart disease. This study aimed to examine miRNA-133, miRNA-26 and miRNA-378 as candidate biomarkers to define prognosis in patients with LVH.

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Objective: Catechol-O-methyltransferase (COMT), the product of the gene, detoxifies the carcinogenic catechol estrogens. The aim of the present study was to examine the relationship between polymorphism and the risk of ovarian cancer.

Material And Methods: The study groups consist of 94 individuals as a patients group with ovarian cancer (n=47) and control group (n=47).

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Purpose: Chordomas are highly therapy-resistant primary bone tumors that exhibit high relapse rates and may induce local destruction. Here, we evaluated the effects of tumor necrosis factor-alpha (TNF-α) on chordoma progression and clinical outcome.

Methods: Chordoma cells were treated with TNF-α after which its short- and long-term effects were evaluated.

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Although glioblastomas are common, there remains a need to elucidate the underlying mechanisms behind their initiation and progression and identify molecular pathways for improving treatment. In this study, sixteen fresh-frozen glioblastoma samples and seven samples of healthy brain tissues were analyzed with miRNA and whole transcriptome microarray chips. Candidate miRNAs and mRNAs were selected to validate expression in fifty patient samples in total with the criteria of abundance, relevance and prediction scores.

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Background: Although meningioma is a common disease, there is a lack of understanding of the underlying molecular mechanisms behind its initiation and progression. We used combined miRNA-mRNA transcriptome analysis to discover dysregulated genes and networks in meningiomas.

Methods: Fourteen fresh-frozen meningioma samples and one human meningeal cell line were analyzed by using miRNA and whole transcriptome microarray chips.

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Background/aim: Coronary artery disease (CAD) is a chronic inflammatory disease seen as formation of atherosclerotic plaques (atheroma) in coronary arteries. Recent published papers show that DNA damage and repair mechanisms play a crucial role on the development and severity of atheromas. In this study, we investigated nucleotide excision repair (NER) pathway-related gene polymorphisms in atherosclerosis.

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Background: Apolipoprotein E (ApoE) is a potential inhibitor of cell proliferation, immune regulation and modulation of cell growth and differentiation; it also has a substantial role in antioxidant activity. ApoE has a potential role in prostate cancer progression.

Materials And Methods: ApoE genotyping was performed using real-time polymerase chain reaction (RT-PCR) for blood samples from a group of patients with prostate cancer (n=68) and a control group (n=78).

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Background: Cytokine-mediated immune and inflammatory responses are considered to play an important role in the pathogenesis of prostate cancer. The present study investigated certain interleukin-1β (IL1β) polymorphisms and their association with prostate cancer.

Materials And Methods: Genotyping of the IL1B-31(rs 1143627 G>A) and IL1B-511(rs 16944 A View Article and Find Full Text PDF

Aim: This study aimed to analyze the relation between uterine leiomyoma (ULM) patients and p.Q192R polymorphism.

Materials And Methods: ULM patients (n=76) and healthy women (n=103) were recruited from the Yeditepe University, Department of Gynecology and Obstetrics.

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Uterine leiomyomas (ULM), are benign tumors of the smooth muscle cells of the myometrium. They represent a common health problem and are estimated to be present in 30-70% of clinically reproductive women. Abnormal angiogenesis and vascular-related growth factors have been suggested to be associated with ULM growth.

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Background/aim: Leptin is a hormone that is known to be related to weight gain and obesity. The soluble leptin receptor has been found in plasma as an important determinant of leptin sensitivity. In this study, our goal was to investigate the association between leptin levels and leptin receptor polymorphisms in a Turkish population.

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Background: The angiotensin converting enzyme (ACE) gene, which has been found to have an insertion and deletion polymorphism (I/D), is of increasing interest in etiology and treatment of various psychiatric disorders such as panic disorder. The present study aimed to investigate the relationship between ACE polymorphism and panic disorder.

Materials And Methods: In this study, 43 patients diagnosed with panic disorder at the Erenköy Mental and Neurological Diseases Training and Research Hospital, Istanbul and 41 healthy controls were enrolled.

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Among the suspected reasons for varicose vein formation are changes in the quantity and content of the elastin protein; however, comprehensive investigations about elastin assembly in varicose vein formation are yet lacking. In this study, we aimed to determine the changes in mRNA levels of elastin and some of its functionally related proteins, fibulin 5, LOXL-1, MMP-2 and MMP-9 in varicose vein formation. We analysed the mRNA levels of elastin, fibulin-5, LOXL1, MMP2 and MMP9 in samples of 35 healthy and 35 varicose great saphenous vein tissues.

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The purpose of this study was to investigate whether functional polymorphisms of apoptosis pathway genes FAS and FASL are associated with the development of primary brain tumors. The study constituted 83 patients with primary brain tumor and 108 healthy individuals. In the present case-control study, the primary brain tumors were divided into two groups: gliomas and meningiomas.

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Atherosclerosis is a major pathological process related with several important adverse vascular events including coronary artery disease, stroke, and peripheral arterial disease. Endothelial lipase is an enzyme the activity of which affects all of lipoproteins, whereas HDL is the main substrate. The purpose of our study was to investigate the effects of endothelial lipase gene polymorphism and inflammation markers (CRP, IL-1β, IL-6, IL-8 and TNF-α) in the atherosclerosis.

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Object: Chordomas are locally aggressive bone tumors known to arise from the remnants of the notochord. Because chordomas are rare, molecular studies aimed at developing new therapies are scarce and new approaches are needed. Chordoma cells and cancer stem-like cells share similar characteristics, including self-renewal, differentiation, and resistance to chemotherapy.

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Background: Obesity is a multifactorial, chronic disorder leading to adverse metabolic effects on plasma lipid levels. Apolipoprotein AI (Apo AI) is the major structural component of high-density lipoprotein (HDL) and is involved in the esterification of cholesterol as a cofactor of lecithin-cholesterol acyltransferase (LCAT) and thus plays a major role in cholesterol efflux from peripheral cells. The APOA1 gene is associated with changes in lipid metabolism.

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In this study, we aimed to investigate a possible association of the COX-2 polymorphisms (-765G→C and -1195A→G) and with the risk of developing epithelial ovarian carcinoma (EOC). COX-2 gene polymorphisms was investigated in 111 healthy women and 57 patients with EOC. Individuals who had -765 CG, -1195 AA genotype, and -765 C allele had increased risk for ovarian carcinoma (P < 0.

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Aim: We aimed to confirm any relation between the manganese-containing superoxide dismutase (MnSOD) polymorphism and risk of ovarian carcinoma as well as to demonstrate any relation between the MnSOD mitochondrial signal sequence polymorphism and plasma MnSOD enzyme levels in women with ovarian carcinoma and healthy subjects.

Methods: In a population-based case - control study, we compared 55 cases with ovarian carcinoma and 51 controls regarding the occurrence of the C/T (alanine/valine, A/V) substitution at the -9 position in the mitochondrial signal sequence of the MnSOD gene. Polymerase chain reaction, restriction fragment length polymorphism and Nu-Sieve agarose gel electrophoresis were utilized to perform genotyping.

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