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    Expression of salivary LINC01206, LINC01209, LINC01994, and ABCC5-AS1 may serve as diagnostic tools in laryngeal cancer
    (Elsevier, 2022) Aktan, Cagdas; Kucukaslan, Ali Sahin; Cengiz, A. Bugra; Demirci, Mehmet; Sunter, Volkan; Baygul, Arzu; Dalmizrak, Aysegul
    Purpose of the study: lncRNAs appear to act as an important epigenetic regulator of the immune response to bacterial infection in mammals. However, a lncRNA that only exhibits pathogenic or beneficial potential during infection has not yet been described. Moreover, it is still not fully known whether there are specific lncRNAs whose expression changes in response to a particular pathogen or whether lncRNAs are mainly involved in basic cellular immune responses to different stress stimuli. This study aims to assess association between salivary lncRNAs and salivary bacterial pathogens in laryngeal cancer patients. Methods: LINC01206, LINC01209, LINC01994, and ABCC5-AS1 were analyzed among 13 candidate lncRNAs in the saliva samples of 35 patients with laryngeal carcinoma and 25 healthy control. Both their expressions and the quantitative amount of oral bacteria members (Rothia mucilaginosa, Streptococcus spp., Prevotella oris, Veillonella dispar, Neisseria subflava, and Peptostreptococcus stomatis) were analyzed using qPCR. To determine whether these lncRNAs and bacterial pathogens are useful as diagnostic biomarkers, their association with clinicopathological and demographic characteristics was analyzed. Results: When the study group compared with the control group, expression of LINC01206, LINC01209, LINC01994, and ABCC5-AS1 were 2.84-fold, 2.33-fold, 4.46-fold, and 2.27-fold lower, respectively (p < 0.05). In terms of the amount of bacteria DNA in saliva, no significant difference was found between the laryngeal cancer and the control groups (p > 0.05). Conclusion: These results may provide novel insights into the molecular mechanism underlying laryngeal cancer and lncRNA/microbiome applications may constitute a new and alternative method to prevent development of laryngeal cancer in the future.
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    Oral microbial dysbiosis in patients with oral cavity cancers
    (Springer Heidelberg, 2024) Unlu, Ozge; Demirci, Mehmet; Paksoy, Tugce; Eden, Arzu Baygul; Tansuker, Hasan Deniz; Dalmizrak, Aysegul; Aktan, Cagdas
    Objectives The pathogenesis of oral cavity cancers is complex. We tested the hypothesis that oral microbiota dysbiosis is associated with oral cavity cancer. Materials and methods Patients with primary oral cavity cancer who met the inclusion and exclusion criteria were included in the study. Matching healthy individuals were recruited as controls. Data on socio-demographic and behavioral factors, self-reported periodontal measures and habits, and current dental status were collected using a structured questionnaire and periodontal chartings. In addition to self-reported oral health measures, each participant received a standard and detailed clinical examination. DNA was extracted from saliva samples from patients and healthy controls. Next-generation sequencing was performed by targeting V3-V4 gene regions of the 16 S rRNA with subsequent bioinformatic analyses. Results Patients with oral cavity cancers had a lower quality of oral health than healthy controls. Proteobacteria, Aggregatibacter, Haemophilus, and Neisseria decreased, while Firmicutes, Bacteroidetes, Actinobacteria, Lactobacillus, Gemella, and Fusobacteria increased in oral cancer patients. At the species level, C. durum, L. umeaens, N. subflava, A. massiliensis, and V. dispar were significantly lower, while G. haemolysans was significantly increased (p < 0.05). Major periodontopathogens associated with periodontal disease (P. gingivalis and F.nucleatum) increased 6.5- and 2.8-fold, respectively. Conclusion These data suggested that patients with oral cancer had worse oral health conditions and a distinct oral microbiome composition that is affected by personal daily habits and may be associated with the pathogenicity of the disease and interspecies interactions. Clinical relevance This paper demonstrates the link between oral bacteria and oral cancers, identifying mechanistic interactions between species of oral microbiome.