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Öğe The effect of multiple outgrowths from bronchial tissue explants on progenitor/stem cell number in primary bronchial epithelial cell cultures from smokers and patients with COPD(Frontiers Media SA, 2023) Bostancieri, Nuray; Bakir, Kemal; Kul, Seval; Eralp, Ayhan; Kayalar, Ozgecan; Konyalilar, Nur; Rajabi, HadiBackground: Although studies suggest a deficiency in stem cell numbers in chronic airway diseases such as chronic obstructive pulmonary disease (COPD), the role of bronchial epithelial progenitor/stem (P/S) cells is not clear. The objectives of this study were to investigate expression of progenitor/stem (P/S) cell markers, cytokeratin (CK) 5, CK14 and p63 in bronchial epithelial explants and cell cultures obtained from smokers with and without COPD following multiple outgrowths, and to study this effect on bronchial epithelial cell (BEC) proliferation. Methods: Bronchial epithelial explants were dissected from lung explants and cultured on coverslips. Confluent cultures were obtained after 3–4 weeks’ (transfer, Tr1), explants were then transferred and cultured for a second (Tr2) and third (Tr3) time, respectively. At each stage, expression of CK5, CK14 and p63 in explants and BEC were determined by immunostaining. In parallel experiments, outgrowing cells from explants were counted after 4wks, and explants subsequently transferred to obtain new cultures for a further 3 times. Results: As the transfer number advanced, CK5, CK14 and p63 expression was decreased in both explants and BEC from both smokers without COPD and patients with COPD, with a more pronounced decrease in BEC numbers in the COPD group. Total cell numbers cultured from explants were decreased with advancing outgrowth number in both groups. Smoking status and lung function parameters were correlated with reduced P/S marker expression and cell numbers. Conclusion: Our findings suggest that the number of P/S cells in airway epithelium may play a role in the pathogenesis of COPD, as well as a role in the proliferation of airway epithelial cells, in vitro. Copyright © 2023 Bostancieri, Bakir, Kul, Eralp, Kayalar, Konyalilar, Rajabi, Yuncu, Yildirim and Bayram.Öğe Existence of SARS-CoV-2 RNA on ambient particulate matter samples: A nationwide study in Turkey(Elsevier, 2021) Kayalar, Özgecan; Ari, Akif; Babuccu, Gizem; Konyalilar, Nur; Doğan, Özlem; Can, Fusun; Bayram, Hasan; Tecer, Lokman Hakan; Fıçıcı, MerveCoronavirus disease 2019 (COVID-19) is caused by the SARS-CoV-2 virus and has been affecting the world since the end of 2019. The disease led to significant mortality and morbidity in Turkey, since the first case was reported on March 11th, 2020. Studies suggest a positive association between air pollution and SARS-CoV-2 infection. The aim of the present study was to investigate the role of ambient particulate matters (PM), as potential carriers for SARS-CoV-2. Ambient PM samples in various size ranges were collected from 13 sites including urban and urban-background locations and hospital gardens in 10 cities across Turkey between 13th of May and 14th of June 2020 to investigate the possible presence of SARS-CoV-2 RNA on ambient PM. A total of 203 daily samples (TSP, n = 80; PM2.5, n = 33; PM2.5-10, n = 23: PM10 mu m, n = 19; and 6 size segregated PM, n = 48) were collected using various samplers. The N1 gene and RdRP gene expressions were analyzed for the presence of SARS-CoV-2, as suggested by the Centers for Disease Control and Prevention (CDC). According to real time (RT)-PCR and three-dimensional (3D) digital (d) PCR analysis, dual RdRP and NI gene positivity were detected in 20 (9.8%) samples. Ambient PM-bound SARS-CoV-2 was analyzed quantitatively and the air concentrations of the virus ranged from 0.1 copies/m(3) to 23 copies/m(3). The highest percentages of virus detection on PM samples were from hospital gardens in Tekirdag, Zonguldak, and Istanbul, especially in PM2.5 mode. Findings of this study have suggested that SARS-CoV-2 may be transported by ambient partides, especially at sites close to the infection hot-spots. However. whether this has an impact on the spread of the virus infection remains to be determined. (C) 2021 Elsevier B.V. All rights reserved.Öğe Investigation of SARS-CoV-2 RNA on Particulate Matters: A multicentre study in Turkey(European Respiratory Soc Journals Ltd, 2021) Konyalilar, Nur; Kayalar, Özgecan; Ari, Akif; Babaccu, Gizem; Doğan, Özlem; Can, Fusun; Bayram, Hasan; Tecer, Lokman Hakan; Fıçıcı, Merve[No Abstract Available]Öğe Presence of Severe Acute Respiratory Syndrome-Related Coronavirus 2 (SARS-CoV-2) RNA on Particulate Matters: A Multi Central Study in Turkey(Amer Thoracic Soc, 2021) Bayram, Hasan; Kayalar, Özgecan; Ari, A.; Babuccu, G.; Konyalilar, Nur; Doan, O.; Ahin, U.; Tecer, Lokman Hakan; Fıçıcı, Merve[No Abstract Available]
