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Chlamydia lung infection

Hengling Cai, Shenghua Chen, Sha Xu, Yuanbin Sun, Qinqin Bai, Chunxue Lu, Yuyu Chen, Xizong Fu, Guilian Xu, Lili Chen
LIGHT, a costimulatory member of the immunoglobulin superfamily (Ig SF), can greatly impact T cell activation. The role of the LIGHT signaling pathway in chlamydial infection was evaluated in mice following respiratory tract infection with Chlamydia psittaci. Compared with wild type (WT) mice, LIGHT knockout (KO) mice showed significant reduction of body weight, much lower survival rate, higher bacterial burden, prolonged infection time courses and more severe pathological changes in lung tissue. The mRNA levels of IFN-γ, TNF-α, IL-17 and IL-12 in the lung tissue of LIGHT KO mice were significantly lower than those in WT mice...
October 8, 2016: Microbial Pathogenesis
J T Mackie, A K Gillett, C Palmieri, T Feng, D P Higgins
Chlamydiosis is a common infectious disease of koalas (Phascolarctos cinereus), but Chlamydia spp. have not yet been demonstrated to cause pneumonia in these animals. A juvenile male koala died following an episode of respiratory disease. At necropsy examination, the lung tissue was consolidated. Microscopical lesions in the lung included pyogranulomatous bronchopneumonia, proliferation of bronchiolar and alveolar epithelium and interstitial fibrosis. Hyperplastic bronchiolar epithelial cells contained aggregates of small basophilic punctate organisms, which were confirmed as chlamydiae by transmission electron microscopy and immunohistochemistry...
August 24, 2016: Journal of Comparative Pathology
Kensuke Shima, Jonas Coopmeiners, Simon Graspeuntner, Klaus Dalhoff, Jan Rupp
Community-acquired pneumonia is caused by intra- and extracellular bacteria, some of which are also linked to the pathogenesis of chronic lung diseases, such as asthma and chronic obstructive pulmonary disease (COPD). Chlamydia pneumoniae is an obligate intracellular pathogen that is highly sensitive to micro-environmental conditions that control both pathogen growth and host immune responses. Availability of nutrients, as well as changes in oxygen, pH and interferon-γ (IFNγ) levels have been shown to directly influence chlamydial life cycle and clearance...
August 10, 2016: FEBS Letters
Richard Y Kim, Jay C Horvat, James W Pinkerton, Malcolm R Starkey, Ama T Essilfie, Jemma R Mayall, Prema M Nair, Nicole G Hansbro, Bernadette Jones, Tatt Jhong Haw, Krishna P Sunkara, Thi Hiep Nguyen, Andrew G Jarnicki, Simon Keely, Joerg Mattes, Ian M Adcock, Paul S Foster, Philip M Hansbro
BACKGROUND: Severe steroid-insensitive asthma is a substantial clinical problem. Effective treatments are urgently required, however, their development is hampered by a lack of understanding of the mechanisms of disease pathogenesis. Steroid-insensitive asthma is associated with respiratory tract infections and noneosinophilic endotypes, including neutrophilic forms of disease. However, steroid-insensitive patients with eosinophil-enriched inflammation have also been described. The mechanisms that underpin infection-induced, severe steroid-insensitive asthma can be elucidated by using mouse models of disease...
June 10, 2016: Journal of Allergy and Clinical Immunology
Simon Thierry, Fabien Vorimore, Christelle Rossignol, Sabine Scharf, Konrad Sachse, Patricia Berthon, Benoit Durand, Isabelle Virlogeux-Payant, Nicole Borel, Karine Laroucau
Enteric infections caused by Chlamydia (C.) psittaci are frequent in ducks, but mostly remain subclinical under field conditions. To emulate natural infection, we investigated the pathogenic potential of a C. psittaci field strain in orally inoculated 4-day-old ducklings. Three different challenge doses were tested and seven contact animals were also mock-inoculated with buffer in each group. Over the course of ten days, the birds were monitored for clinical symptoms and chlamydial dissemination before final examination of tissues using histopathology and immunohistochemistry...
2016: PloS One
Mingxing Liang, Yating Wen, Ou Ran, Liesong Chen, Chuan Wang, Li Li, Yafeng Xie, Yang Zhang, Chaoqun Chen, Yimou Wu
Chlamydia psittaci is a zoonotic pathogen with a broad host range that can lead to severe respiratory and systemic disease in humans. Currently, an effective commercial vaccine against C. psittaci infection is not available. The chlamydial plasmid is an important virulence factor and encodes plasmid proteins that play important roles in chlamydial infection and the corresponding immune response. In this study, we assessed the efficacy of vaccination with plasmid proteins at preventing C. psittaci lung infection in a murine model...
July 2016: Applied Microbiology and Biotechnology
Meng Xiangying, Wang Tao, Wu Shikai, Song Santai, Jiang Zefei
Everolimus has been used in patients with hormone receptor-positive breast cancer. This study reports that treatment with everolimus alone induced severe pulmonary injury in a patient with systemic metastatic breast cancer. A 58-yearold woman with systemic metastatic breast cancer was treated with everolimus alone for 4 weeks and developed severe cough and dyspnea. Computed tomography (CT) scan of the chest showed a progressive lung tumor accompanied by bilateral pulmonary homogeneous ground-glass opacity, especially in the inferior lobe of the left lung...
March 2, 2016: International Journal of Clinical Pharmacology and Therapeutics
Shahanavaj Khan, Ahamad Imran, Abdul Arif Khan, Mohd Abul Kalam, Aws Alshamsan
Accumulating evidence has recently supported the association of bacterial infection with the growth and development of cancers, particularly in organs that are constantly exposed to bacteria such as the lungs, colon, cervical cancer etc. Our in silico study on the proteome of Chlamydia pneumoniae suggests an unprecedented idea of the etiology of lung cancer and have revealed that the infection of C. pneumoniae is associated with lung cancer development and growth. It is reasonable to assume that C. pneumoniae transports its proteins within host-intracellular organelles during infection, where they may work with host-cell proteome...
2016: PloS One
Stefanie Lagae, Annelien Dumont, Daisy Vanrompay
It has since long been reported that Chlamydia psittaci is endemic in the poultry industry in Belgium as well as in other European Countries. This can lead to major economic losses because of a lowered egg production, higher mortality and carcass condemnation. Nowadays, expensive antibiotic treatments are necessary to reduce mortality rate but this can lead to antibiotic resistance. Moreover, C. psittaci can easily be transmitted from birds to humans through the inhalation of pathogen-containing aerosols derived from feces and eye and nostril secretions...
February 2016: Veterinary Immunology and Immunopathology
Pavel Dutow, Lea Wask, Miriam Bothe, Beate Fehlhaber, Robert Laudeley, Claudia Rheinheimer, Zhangsheng Yang, Guangming Zhong, Silke Glage, Andreas Klos
Chlamydia trachomatis causes sexually transmitted diseases with infertility, pelvic inflammatory disease and neonatal pneumonia as complications. The duration of urogenital mouse models with the strict mouse pathogen C. muridarum addressing vaginal shedding, pathological changes of the upper genital tract or infertility is rather long. Moreover, vaginal C. trachomatis application usually does not lead to the complications feared in women. A fast-to-perform mouse model is urgently needed to analyze new antibiotics, vaccine candidates, immune responses (in gene knockout animals) or mutants of C...
March 2016: Pathogens and Disease
Xianbao He, Yanmei Liang, Michael P LaValley, Juying Lai, Robin R Ingalls
BACKGROUND: Chlamydia pneumoniae is a common human pathogen that is associated with upper and lower respiratory tract infections. It has also been suggested that C. pneumoniae infection can trigger or promote a number of chronic inflammatory conditions, including asthma and atherosclerosis. Several strains of C. pneumoniae have been isolated from humans and animals, and sequence data demonstrates marked genetic conservation, leaving unanswered the question as to why chronic inflammatory conditions may occur following some respiratory-acquired infections...
October 23, 2015: BMC Microbiology
Malcolm R Starkey, Duc H Nguyen, Alexandra C Brown, Ama-Tawiah Essilfie, Richard Y Kim, Hideo Yagita, Jay C Horvat, Philip M Hansbro
Chlamydia infections are frequent causes of respiratory illness, particularly pneumonia in infants, and are linked to permanent reductions in lung function and the induction of asthma. However, the immune responses that protect against early-life infection and the mechanisms that lead to chronic lung disease are incompletely understood. In the current study, we investigated the role of programmed death (PD)-1 and its ligands PD-L1 and PD-L2 in promoting early-life Chlamydia respiratory infection, and infection-induced airway hyperresponsiveness (AHR) and severe allergic airway disease in later life...
April 2016: American Journal of Respiratory Cell and Molecular Biology
Eric Gracey, Yuriy Baglaenko, Nadia Prayitno, Nico Van Rooijen, Ali Akram, Aifeng Lin, Basil Chiu, Robert D Inman
Protective immunity to the pathogen Chlamydia is dependent on a robust IFN-γ response generated by innate and adaptive lymphocytes. Here we assess the role of the macrophage in orchestrating a protective response in vivo to the murine pathogen, Chlamydia muridarum. During acute pulmonary and peritoneal infection, resident macrophages in both sites are infected with C. muridarum and adopt an inflammatory phenotype. In the lung, this activation is restricted to interstitial macrophages, which harbor higher levels of C...
December 2015: European Journal of Immunology
Annette Prohl, Katharina Wolf, Corinna Weber, Kerstin E Müller, Christian Menge, Konrad Sachse, Jürgen Rödel, Petra Reinhold, Angela Berndt
Infection of cattle with chlamydiae is ubiquitous and, even in the absence of clinical sequeleae, has a quantifiable negative impact on livestock productivity. Despite recent progress, our knowledge about immune response mechanisms capable of counteracting the infection and preventing its detrimental effects is still limited. A well-established model of bovine acute respiratory Chlamydia (C.) psittaci infection was used here to characterize the kinetics of the local and systemic immune reactions in calves. In the course of two weeks following inoculation, leukocyte surface marker expression was monitored by flow cytometry in blood and bronchoalveolar lavage fluid (BALF)...
2015: PloS One
Sudhanshu Shekhar, Ying Peng, Xiaoling Gao, Antony G Joyee, Shuhe Wang, Hong Bai, Lei Zhao, Jie Yang, Xi Yang
The impact of the interaction between NK cells and lung dendritic cells (LDCs) on the outcome of respiratory infections is poorly understood. In this study, we investigated the effect and mechanism of NK cells on the function of LDCs during intracellular bacterial lung infection of Chlamydia muridarum in mice. We found that the naive mice receiving LDCs from C. muridarum-infected NK-cell-depleted mice (NK-LDCs) showed more serious body weight loss, bacterial burden, and pathology upon chlamydial challenge when compared with the recipients of LDCs from infected sham-treated mice (NK+LDCs)...
October 2015: European Journal of Immunology
Annette Prohl, Wieland Schroedl, Heidrun Rhode, Petra Reinhold
BACKGROUND: Cumulating reports suggest that acute phase proteins (APPs) do not only play a role as systemic inflammatory mediators, but are also expressed in different tissues as local reaction to inflammatory stimuli. The present study aimed to evaluate presence and changes in luminal lung concentrations of the APPs haptoglobin (Hp), lipopolysaccharide binding protein (LBP), C-reactive protein (CRP), and lactoferrin (Lf) in calves with an acute respiratory disease experimentally induced by Chlamydia (C...
2015: BMC Veterinary Research
D Álvarez, J Salinas, A J Buendía, N Ortega, L del Río, J Sánchez, J A Navarro, M C Gallego, A Murcia-Belmonte, F Cuello, M R Caro
Pregnant ewes have been widely used to test vaccines against Chlamydia abortus. However, this model entails many disadvantages such as high economic costs and long periods of pregnancy. The murine model is very useful for specific studies but cannot replace the natural host for the later stages of vaccine evaluation. Therefore, a non-pregnant model of the natural host might be useful for a vaccine trial to select the best vaccine candidates prior to use of the pregnant model. With this aim, two routes of infection were assessed in young non-pregnant sheep, namely, intranasal (IN) and intratracheal (IT)...
September 2015: Veterinary Journal
Alyce Taylor-Brown, Simon Rüegg, Adam Polkinghorne, Nicole Borel
Chlamydiosis has been described in both free-ranging and captive reptiles. The infection usually manifests as granulomatous inflammation in inner organs such as spleen, heart, lung and liver but might also occur in asymptomatic reptiles. The aim of this study was to investigate and characterise Chlamydia pneumoniae and potential other novel chlamydial infections in the choana and cloaca samples of 137 clinically healthy captive snakes from six private collections. Forty eight samples from 29 animals were found to be positive by a Chlamydiaceae family-specific qPCR...
July 9, 2015: Veterinary Microbiology
Thomas Weinmaier, Jonathan Hoser, Sebastian Eck, Inga Kaufhold, Kensuke Shima, Tim M Strom, Thomas Rattei, Jan Rupp
BACKGROUND: Chlamydia pneumoniae (Cpn) are obligate intracellular bacteria that cause acute infections of the upper and lower respiratory tract and have been implicated in chronic inflammatory diseases. Although of significant clinical relevance, complete genome sequences of only four clinical Cpn strains have been obtained. All of them were isolated from the respiratory tract and shared more than 99% sequence identity. Here we investigate genetic differences on the whole-genome level that are related to Cpn tissue tropism and pathogenicity...
2015: BMC Genomics
Katrin Janik, Jenny Bode, Pavel Dutow, Robert Laudeley, Robert Geffers, Kirsten Sommer, Silke Glage, Andreas Klos
The obligate intracellular bacterium Chlamydia (C.) pneumoniae causes respiratory infections and is associated with vascular diseases. To elucidate how temperature and host cells used for propagation alter chlamydial virulence, C. pneumoniae CWL0129 (Cpn) was cultured at 35 or 37°C in two different cell lines and then applied to mice. These mice infected with differentially propagated chlamydiae showed differences in clinical score, body weight and inflammatory cytokines in the lung. Our study demonstrates that Cpn cultured at 37°C in hamster fibroblast BHK-21 are able to colonize the mouse lung faster and better, and induce stronger symptoms and cytokine induction than bacteria cultured at 35°C...
February 2015: Pathogens and Disease
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