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Investigation of the Impact of Streptococcus Pneumoniae on A549 Pneumocytes

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Investigation of the Impact of Streptococcus Pneumoniae on A549 Pneumocytes ArchiveJundishapur of J MicrobiolSID . 2019 July; 12(7):e90811. doi: 10.5812/jjm.90811. Published online 2019 August 10. Research Article Investigation of the Impact of Streptococcus pneumoniae on A549 Pneumocytes Long He #1, Da-Kang Hu #2, Shuang-Chun Liu 3, Xin-Hua Luo 1, Lian-Hua Yu 1, Ying Qu 1, Jin-Hong Yang 4, Jian Yu 4, Xiang-Yang Li 4, Wei-Wei Shen 5 and Jin Zhang 1, * 1Department of Laboratory Medicine, Taizhou Municipal Hospital, Taizhou City, China 2Department of Laboratory Medicine, The First People’s Hospital of Wenling, Zhejiang, China 3Department of Blood Transfusion, Taizhou Municipal Hospital, Taizhou City, China 4Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou City, China 5Department of Microbiology, Taizhou Center for Disease Control and Prevention, Zhejiang Province, China *Corresponding author: Department of Laboratory Medicine, Taizhou Municipal Hospital, 381# Zhongshan East Road, Jiaojiang District, 318000, Taizhou City, China. Tel: +86-057688858142, Fax: +86-057688858142, Email: [email protected] # These authors are contributed equally as the first author. Received 2019 February 18; Revised 2019 June 19; Accepted 2019 June 22. Abstract Background: Streptococcus pneumoniae is a leading pathogen worldwide and its pathogenesis remains unclear. Objectives: The study aimed to investigate the secretion of interleukin-8 (IL-8) and soluble intercellular adhesion molecule-1 (ICAM- 1) from A549 pneumocytes stimulated by different S. pneumoniae strains and the mechanism of blood-derived S. pneumoniae (bd-SP) in invading the blood system. Methods: Twenty-three clinical strains of S. pneumoniae isolated in 2009 along with ATCC49619 were cultured and suspended in 2018. Then, A549 pneumocytes were resuspended after culture and collection, and inoculated into culture plates. Streptococcus pneumoniae suspensions were then inoculated. Normal saline was blank control. The plates were incubated for four and eight hours. Then, the suspensions were collected and centrifuged. The supernatant was analyzed for IL-8 and ICAM-1 by ELISA. Results: The concentrations of IL-8 were 180.6, 188.5, 223.4 ± 19.9, and 230.3 ± 38.6 pg/mL for blank control, ATCC49619, blood-derived S. pneumoniae (bd-SP) and sputum-derived S. pneumoniae (sd-SP) at four-hour stimulation, respectively, and 249.2, 275.7, 224.0 ± 27.8, and 242.3 ± 33.1 pg/mL at eight-hour stimulation. The concentrations of ICAM-1 were 14.8, 12.1, 19.9 ± 17.2, and 26.1 ± 28.6 ng/mL for blank control, ATCC49619, bd-SP, and sd-SP at 4 hours, respectively, and 32.6, 150.8, 69.4 ± 45.1, and 58.7 ± 30.1 ng/mL at 8 hours. Conclusions: Streptococcus pneumoniae could upregulate the secretion of IL-8 and ICAM-1 from A549 pneumocytes. No signifi- cant difference was found between bd-SP and sd-SP which was in contrast to what was found between clinical S. pneumoniae and ATCC49619. Host response may not be a vital factor for different S. pneumoniae infections. Keywords: Streptococcus pneumoniae, Interleukin-8, Intercellular Adhesion Molecule-1, ELISA 1. Background moniae and the body’s immune system. There are vari- ous components associated with S. pneumoniae-induced immune response, such as the capsule and other virulence Streptococcus pneumoniae was recognized as the main factors (5-7). In addition, many immune cells such as neu- cause of community-acquired pneumonia, tympanitis, trophils, monocytes/macrophages, and dendritic cells are meningitis, and abscess in 1881, especially in infants and involved in this process (6,8-10), which are responsible for the elderly (1). Approximately, one million children un- the release of factors including IL-1α, IL- 1β, IL-6, IFN-α, IL-8, der the age of five years succumb to pneumonia annu- and ICAM-1 (6,8). ally worldwide with S. pneumoniae being a major cause of death (2,3). Streptococcus pneumoniae also thrives in the The incidence of S. pneumoniae infection-induced sep- upper respiratory tract of asymptomatic carriers as an op- ticemia and meningitis is about 5%, and its highest mor- portunistic pathogen (4). However, it is difficult to predict tality exceeds 30% (11, 12). There is limited research on when it turns pathogenic. This is because the transition the blood and nervous system invasion by S. pneumoniae, from a primary colonization bacterium to a pathogenic which may be attributed to difficulties in composing clini- bacterium involves a complex interaction between S. pneu- cal cases. As indicated earlier, S. pneumoniae infection in- Copyright © 2019, Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original workwww.SID.ir is properly cited. Archive of SID He L et al. evitably involves the interaction between the body’s im- Instruments Co. Ltd., USA). A549 cells within seven gen- mune system and virulence factors. erations were collected with the aforementioned medium A549 cell is a lung cell derived from human lung adeno- without 1% penicillin-streptomycin. Cells were finally ad- carcinomas. Lung cells are important defense cells against justed to 3.0 × 108 /L. S. pneumoniae infections, and are the most commonly used cells in studying the pathogenicity of S. pneumoniae. The 3.3. A549 Cell Stimulation Array adhesion property of different S. pneumoniae strains has In this procedure, 1.0 mL of A549 cell concentrated sus- been verified using A549 cells (13). Most studies on S. pneu- pension was added to 50 wells of a cell culture plate and moniae tried to focus on individual cytokines or individual two wells were designated as controls. Then, 100 µL of virulence genes (14). However, many virulence genes may 1.0 McFarland S. pneumoniae concentrated suspension was play combined roles in the S. pneumoniae invasion process added to each well while 100 µl of saline water was added and final pathogenesis. to the control wells. Subsequently, the plate was incubated at 37°C with 5% CO2. After four hours, the contents of the 2. Objectives first 25 wells (including one control) were transferred into 1.5-mL centrifuge tubes. Next, the tubes were centrifuged Since the interactions of S. pneumoniae and the body at 4,000 rpm for 10 minutes and the supernatants were are very complex, this study selected a representative cy- used for the determination of IL-8 and sICAM-1. After eight tokine along with an adhesion molecule to represent the hours, the contents of the remaining 25 wells (including interaction. In the present study, we used different sources one control) were taken and the above-mentioned steps of S. pneumoniae to stimulate A549 cells and analyze the were repeated. changes in the secretion of cytokine IL-8 and adhesion molecule sICAM-1. We also attempted to determine the 3.4. IL-8 and sICAM-1 Detection characteristic biological differences of S. pneumoniae con- cerning source differences and explore the possible mech- The detection of IL-8 and sICAM-1 was performed anisms to answer how S. pneumoniae invades blood sys- using the double-antibody sandwich avidin-biotin tems. complex-enzyme-linked immunosorbent assay (ABC- ELISA) method, according to the manufacturer’s protocol (Shanghai Xitang Biological Technology Co., Ltd., Shang- 3. Methods hai, China). 3.1. Strains and Cells 3.5. Statistical Analysis Streptococcus pneumoniae ATCC 49619 was provided by the National Center for Medical Culture Collection of SPSS17.0 software (SPSS, Inc., Chicago, IL, USA) was used China. Twenty-three S. pneumoniae clinical non-repetitive to analyze the data. The following criteria were checked: strains were obtained from the Second Affiliated Hospi- normality at P > 0.10 and homogeneity of variances at P > tal of Wenzhou Medical University in 2009. Eleven strains 0.10. The P values of < 0.05 were considered to indicate sta- were isolated from blood samples, which were denoted as tistically significant differences. blood-derived S. pneumoniae (bd-SP). Twelve strains were isolated from sputum samples, which were denoted as 4. Results sputum-derived S. pneumoniae (sd-SP). All the strains were identified using a VITEK-32 GPI card (bioMerieux, France) As shown in Figure 1A, A549 cells secreted higher and and confirmed by a specific PCR assay (15). A549 cells were lower levels of IL-8 than the blank control after four and purchased from the Shanghai Cell Bank of the Chinese eight hours of stimulation by bd-SP, respectively. All dif- Academy of Sciences. ferences were significant. After four hours of sd-SP stimu- lation, A549 cells secreted more IL-8. However, after eight 3.2. A549 Cell Culture and Collection hours of stimulation, the difference in the concentration The A549 cell line was cultured in F-12K nutrient mix- of IL-8 was not statistically significant between the sd-SP ture (GIBCO Co. Ltd., USA) containing 10% fetal bovine group and blank control. Either of the clinical S. pneumo- serum (Zhejiang Tianhang Biological Technology Co., Ltd. niae groups induced A549 cells to secrete more IL-8 levels Zhejiang, China) and 1% penicillin-streptomycin (Beijing than the corresponding ATCC49619 group did. However, af- Solarbio Science and Technology Co., Beijing, China) at 37°C ter eight hours of stimulation, either of the S. pneumoniae with 5% CO2 in an incubator (Model 311, Thermo Electron groups could induce A549 cells to secrete lower IL-8 levels 2 Jundishapur J Microbiol. 2019;www.SID.ir 12(7):e90811. Archive of SID He L et al. than the ATCC49619 group did. All differences were statis- and pneumonic conditions. Lung cells may also be in- tically significant. For each of the S. pneumoniae groups, volved in the migration of neutrophils to the lung in re- there were no significant differences in the concentration sponse to inflammation via the activation of the NF-κB of IL-8 between four and eight hours of stimulation.
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