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Ellis DA, Jones M, Willems HME, Cheung S, Makullah M, Aimanianda V, Steele C. Fungal chitin is not an independent mediator of allergic fungal asthma severity. Am J Physiol Lung Cell Mol Physiol 2024; 327:L293-L303. [PMID: 38915287 DOI: 10.1152/ajplung.00041.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 05/28/2024] [Accepted: 06/04/2024] [Indexed: 06/26/2024] Open
Abstract
Chitin, a polysaccharide found in the fungal cell wall and the exoskeletons of house dust mites and cockroaches, has garnered attention as a potential immunoreactive allergen. Mammals have evolved to express chitin-degrading chitinases (acidic mammalian chitinase/AMCase and chitotriosidase) that may modulate immune responses to chitin. We have previously reported that mice deficient in AMCase (Chia-/-) demonstrated better lung function during allergic fungal asthma. As expected, we show that mice overexpressing AMCase (SPAM mice) had worse airway hyperreactivity (AHR) during allergic fungal asthma. We further demonstrate that chitin-positive Aspergillus fumigatus conidia are detectable in the allergic lung during chronic exposure. Lung function in Chia-/- and SPAM mice is directly correlated with the level of chitinase activity during chronic fungal exposure (Chia-/- mice, negligible chitinase activity, lower AHR; SPAM mice, heightened chitinase activity, higher AHR), suggesting that the breakdown of chitin promoted AHR. However, chronic exposure of normal mice to purified A. fumigatus chitin resulted in only moderate inflammatory changes in the lung that were not sufficient to induce AHR. Moreover, despite having dramatic differences in chitinase activity, chronic exposure of Chia-/- and SPAM mice to purified A. fumigatus chitin likewise did not modulate AHR. Collectively, these results indicate that chronic exposure to fungal chitin alone is incapable of driving AHR. Furthermore, our data suggest that the chitinase-mediated degradation of chitin associated with A. fumigatus conidia may facilitate unmasking and/or liberation of other fungal cell wall components that drive inflammatory responses that contribute to AHR.NEW & NOTEWORTHY Humans with asthma sensitized to fungi often have more severe asthma than those who are not fungal-sensitized. Chitin makes up a significant portion of the cell wall of fungi and has been implicated as a pathogenic factor in allergic asthma. Ellis et al. demonstrate that chronic exposure to fungal chitin alone is unable to modulate lung function, even in the presence of differential lung chitinase activity.
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Affiliation(s)
- Diandra A Ellis
- Department of Microbiology and Immunology, School of Medicine, Tulane University, New Orleans, Louisiana, United States
| | - MaryJane Jones
- Department of Microbiology and Immunology, School of Medicine, Tulane University, New Orleans, Louisiana, United States
| | - Hubertine M E Willems
- Department of Microbiology and Immunology, School of Medicine, Tulane University, New Orleans, Louisiana, United States
| | - Suki Cheung
- Department of Microbiology and Immunology, School of Medicine, Tulane University, New Orleans, Louisiana, United States
| | - Mgayya Makullah
- Department of Microbiology and Immunology, School of Medicine, Tulane University, New Orleans, Louisiana, United States
| | - Vishukumar Aimanianda
- Unité de Mycologie Moléculaire, Institut Pasteur, Université de Paris, CNRS, UMR2000, Paris, France
| | - Chad Steele
- Department of Microbiology and Immunology, School of Medicine, Tulane University, New Orleans, Louisiana, United States
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2
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Wang Z, Shao J. Fungal vaccines and adjuvants: a tool to reveal the interaction between host and fungi. Arch Microbiol 2024; 206:293. [PMID: 38850421 DOI: 10.1007/s00203-024-04010-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Revised: 05/09/2024] [Accepted: 05/17/2024] [Indexed: 06/10/2024]
Abstract
Fungal infections are incurring high risks in a range from superficial mucosal discomforts (such as oropharyngeal candidiasis and vulvovaginal candidiasis) to disseminated life-threatening diseases (such as invasive pulmonary aspergillosis and cryptococcal meningitis) and becoming a global health problem in especially immunodeficient population. The major obstacle to conquer fungal harassment lies in the presence of increasing resistance to conventional antifungal agents used in newly clinically isolated strains. Although recombinant cytokines and mono-/poly-clonal antibodies are added into antifungal armamentarium, more effective antimycotic drugs are exceedingly demanded. It is comforting that the development of fungal vaccines and adjuvants opens up a window to brighten the prospective way in the diagnosis, prevention and treatment of fungal assaults. In this review, we focus on the progression of several major fungal vaccines devised for the control of Candida spp., Aspergillus spp., Cryptococcus spp., Coccidioides spp., Paracoccidioides spp., Blastomyces spp., Histoplasma spp., Pneumocystis spp. as well as the adjuvants adopted. We then expound the interaction between fungal vaccines/adjuvants and host innate (macrophages, dendritic cells, neutrophils), humoral (IgG, IgM and IgA) and cellular (Th1, Th2, Th17 and Tc17) immune responses which generally experience immune recognition of pattern recognition receptors, activation of immune cells, and clearance of invaded fungi. Furthermore, we anticipate an in-depth understanding of immunomodulatory properties of univalent and multivalent vaccines against diverse opportunistic fungi, providing helpful information in the design of novel fungal vaccines and adjuvants.
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Affiliation(s)
- Zixu Wang
- Laboratory of Anti-Infection and Immunity, College of Integrated Chinese and Western Medicine (College of Life Science), Anhui University of Chinese Medicine, Zhijing Building, 350 Longzihu Road, Xinzhan District, Hefei, 230012, Anhui, People's Republic of China
| | - Jing Shao
- Laboratory of Anti-Infection and Immunity, College of Integrated Chinese and Western Medicine (College of Life Science), Anhui University of Chinese Medicine, Zhijing Building, 350 Longzihu Road, Xinzhan District, Hefei, 230012, Anhui, People's Republic of China.
- Institute of Integrated Traditional Chinese and Western Medicine, Anhui Academy of Chinese Medicine, Zhijing Building, 350 Longzihu Road, Xinzhan District, Hefei, 230012, Anhui, People's Republic of China.
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3
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Lin D, Lin B, Wang X, Xu C, Mo L, Luo Y, Tian H, Zhou L, Chen Z. Mycobacterium marinum mediates regulation of prostaglandin E 2 expression on host immune response through cyclooxygenase pathway. Mol Biol Rep 2024; 51:84. [PMID: 38183522 DOI: 10.1007/s11033-023-09015-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 11/26/2023] [Indexed: 01/08/2024]
Abstract
PURPOSE Investigate the role of COX signaling in activating the PGE2-EP2 pathway. METHODS Utilized a marine Mycobacterium infection model in zebrafish. Marine mycobacteria were stained with fluorescein isothiocyanate. The COX inhibitor indomethacin, EP2 receptor inhibitor AH6809, EP4 receptor inhibitor AH23848 and clodronate Liposomes were used to investigate the role of COX, EP2, EP4 and macrophage whether participating in combat marine mycobacterial infection. The expression level of the target gene was detected using real-time fluorescence quantitative PCR instrument. RESULTS The findings revealed that larvae exposed to the COX inhibitor indomethacin or the EP2 receptor inhibitor AH6809 demonstrated a significantly higher mortality rate due to marine mycobacterium infection than those in the control group. Administration of exogenous prostaglandin E2 (PGE2) rescued the survival of zebrafish infected with marine mycobacteria and treated with indomethacin. Additionally, a significant reduction in survival rate was noted in macrophage-depleted zebrafish infected with marine mycobacteria. CONCLUSION The host may combat marine mycobacterium infection via COX signaling, which activates the PGE2-EP2 pathway and mediates macrophage resistance.
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Affiliation(s)
- Dongzi Lin
- Department of Laboratory Medicine, The Fourth People's Hospital of Nanhai District of Foshan City, 528000, Foshan, Guangdong, China
| | - Bingyao Lin
- Department of Laboratory Medicine, Foshan Fourth People's Hospital, 528041, Foshan, Guangdong, China
| | - Xuezhi Wang
- Department of Laboratory Medicine, Foshan Fourth People's Hospital, 528041, Foshan, Guangdong, China
| | - Cheng Xu
- Department of Laboratory Medicine, The Fourth People's Hospital of Nanhai District of Foshan City, 528000, Foshan, Guangdong, China
| | - Liyi Mo
- Department of Laboratory Medicine, The Fourth People's Hospital of Nanhai District of Foshan City, 528000, Foshan, Guangdong, China
| | - Yanwen Luo
- Department of Laboratory Medicine, The Fourth People's Hospital of Nanhai District of Foshan City, 528000, Foshan, Guangdong, China
| | - Honghong Tian
- Department of Laboratory Medicine, Foshan Fourth People's Hospital, 528041, Foshan, Guangdong, China
| | - Lei Zhou
- Institute of Green Chemistry and Molecular Engineering, School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, China.
| | - Zhenhua Chen
- Department of Laboratory Medicine, The Fourth People's Hospital of Nanhai District of Foshan City, 528000, Foshan, Guangdong, China.
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4
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Thrikawala S, Niu M, Keller NP, Rosowski EE. Cyclooxygenase production of PGE2 promotes phagocyte control of A. fumigatus hyphal growth in larval zebrafish. PLoS Pathog 2022; 18:e1010040. [PMID: 35333905 PMCID: PMC8986117 DOI: 10.1371/journal.ppat.1010040] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 04/06/2022] [Accepted: 03/03/2022] [Indexed: 11/30/2022] Open
Abstract
Invasive aspergillosis is a common opportunistic infection, causing >50% mortality in infected immunocompromised patients. The specific molecular mechanisms of the innate immune system that prevent pathogenesis of invasive aspergillosis in immunocompetent individuals are not fully understood. Here, we used a zebrafish larva-Aspergillus infection model to identify cyclooxygenase (COX) enzyme signaling as one mechanism that promotes host survival. Larvae exposed to the pan-COX inhibitor indomethacin succumb to infection at a significantly higher rate than control larvae. COX signaling is both macrophage- and neutrophil-mediated. However, indomethacin treatment has no effect on phagocyte recruitment. Instead, COX signaling promotes phagocyte-mediated inhibition of germination and invasive hyphal growth. Increased germination and invasive hyphal growth is also observed in infected F0 crispant larvae with mutations in genes encoding for COX enzymes (ptgs2a/b). Protective COX-mediated signaling requires the receptor EP2 and exogenous prostaglandin E2 (PGE2) rescues indomethacin-induced decreased immune control of fungal growth. Collectively, we find that COX signaling activates the PGE2-EP2 pathway to increase control A. fumigatus hyphal growth by phagocytes in zebrafish larvae.
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Affiliation(s)
- Savini Thrikawala
- Department of Biological Sciences, Clemson University, Clemson, South Carolina, United States of America
| | - Mengyao Niu
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Nancy P. Keller
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Emily E. Rosowski
- Department of Biological Sciences, Clemson University, Clemson, South Carolina, United States of America
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5
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Wang C, Zeng ZQ, Zhuang WY. Comparative molecular evolution of chitinases in ascomycota with emphasis on mycoparasitism lifestyle. Microb Genom 2021; 7. [PMID: 34516366 PMCID: PMC8715425 DOI: 10.1099/mgen.0.000646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Chitinases are involved in multiple aspects of fungal life cycle, such as cell wall remodelling, chitin degradation and mycoparasitism lifestyle. To improve our knowledge of the chitinase molecular evolution of Ascomycota, the gene family of 72 representatives of this phylum was identified and subjected to phylogenetic, evolution trajectory and selective pressure analyses. Phylogenetic analysis showed that the chitinase gene family size and enzyme types varied significantly, along with species evolution, especially for groups B and C. In addition, two new subgroups, C3 and C4, are recognized in group C chitinases. Random birth and death testing indicated that gene expansion and contraction occurred in most of the taxa, particularly for species in the order Hypocreales (class Sordariomycetes). From an enzyme function point of view, we speculate that group A chitinases are mainly involved in species growth and development, while the expansion of genes in group B chitinases is related to fungal mycoparasitic and entomopathogenic abilities, and, to a certain extent, the expansion of genes in group C chitinases seems to be correlated with the host range broadening of some plant-pathogenic fungi in Sordariomycetes. Further selection pressure testing revealed that chitinases and the related amino acid sites were under positive selection in the evolutionary history, especially at the nodes sharing common ancestors and the terminal branches of Hypocreales. These results give a reasonable explanation for the size and function differences of chitinase genes among ascomycetes, and provide a scientific basis for understanding the evolutionary trajectories of chitinases, particularly that towards a mycoparasitic lifestyle.
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Affiliation(s)
- Chao Wang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China.,Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, PR China
| | - Zhao-Qing Zeng
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Wen-Ying Zhuang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
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6
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Jiang Z, Hu S, Ma J, Liu Y, Qiao Z, Yan Q, Gao Y, Yang S. Crystal structure of a chitinase (RmChiA) from the thermophilic fungus Rhizomucor miehei with a real active site tunnel. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2021; 1869:140709. [PMID: 34358705 DOI: 10.1016/j.bbapap.2021.140709] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 07/13/2021] [Accepted: 08/02/2021] [Indexed: 02/05/2023]
Abstract
A chitinase gene (RmChiA) encoding 445 amino acid (aa) residues from a fungus Rhizomucor miehei was cloned and overexpressed in Escherichia coli. Two kinds of RmChiA crystal forms, with space groups P32 2 1 and P1, were obtained by sitting-drop vapor diffusion and the structures were determined by X-ray diffraction. The overall structure of RmChiA monomer, which is the first structure of bacterial-type chitinases from nonpathogenic fungi, adopts a canonical triosephosphate isomerase (TIM) barrel fold with two protruding chitinase insertion domains. RmChiA exhibited a unique NxDxE catalytical motif and a real active site tunnel structure, which are firstly found in GH family 18 chitinases. The motif had high structural homolog with the typical DxDxE motif in other GH family 18 chitinases. The tunnel is formed by two unusual long loops, containing 15 aa and 45 aa respectively, linked by a disulfide bond across the substrate-binding cleft. Mutation experiments found that opening the roof of tunnel structure increased the hydrolysis efficiency of RmChiA, but the thermostability of the mutants decreased. Moreover, the tunnel structure endowed RmChiA with the exo-chitinase character.
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Affiliation(s)
- Zhengqiang Jiang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Songqing Hu
- College of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Junwen Ma
- Bioresource Utilization Laboratory, College of Engineering, China Agricultural University, Beijing 100083, China
| | - Yuchun Liu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Zhu Qiao
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore
| | - Qiaojuan Yan
- Bioresource Utilization Laboratory, College of Engineering, China Agricultural University, Beijing 100083, China
| | - Yonggui Gao
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore
| | - Shaoqing Yang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
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7
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Gu X, Hua YH, Zhang YD, Bao DI, Lv J, Hu HF. The Pathogenesis of Aspergillus fumigatus, Host Defense Mechanisms, and the Development of AFMP4 Antigen as a Vaccine. Pol J Microbiol 2021; 70:3-11. [PMID: 33815522 PMCID: PMC8008755 DOI: 10.33073/pjm-2021-003] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 01/10/2021] [Accepted: 01/11/2021] [Indexed: 12/12/2022] Open
Abstract
Aspergillus fumigatus is one of the ubiquitous fungi with airborne conidia, which accounts for most aspergillosis cases. In immunocompetent hosts, the inhaled conidia are rapidly eliminated. However, immunocompromised or immunodeficient hosts are particularly vulnerable to most Aspergillus infections and invasive aspergillosis (IA), with mortality from 50% to 95%. Despite the improvement of antifungal drugs over the last few decades, the therapeutic effect for IA patients is still limited and does not provide significant survival benefits. The drawbacks of antifungal drugs such as side effects, antifungal drug resistance, and the high cost of antifungal drugs highlight the importance of finding novel therapeutic and preventive approaches to fight against IA. In this article, we systemically addressed the pathogenic mechanisms, defense mechanisms against A. fumigatus, the immune response, molecular aspects of host evasion, and vaccines' current development against aspergillosis, particularly those based on AFMP4 protein, which might be a promising antigen for the development of anti-A. fumigatus vaccines.
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Affiliation(s)
- Xiang Gu
- College of Law and Political Science, Nanjing University of Information Science and Technology, Nanjing, China.,The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong, China
| | - Yan-Hong Hua
- The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong, China
| | - Yang-Dong Zhang
- The PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - D I Bao
- The PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Jin Lv
- The PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Hong-Fang Hu
- The PLA Rocket Force Characteristic Medical Center, Beijing, China
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8
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Mackel JJ, Garth JM, Jones M, Ellis DA, Blackburn JP, Yu Z, Matalon S, Curtiss M, Lund FE, Hastie AT, Meyers DA, Steele C. Chitinase 3-like-1 protects airway function despite promoting type 2 inflammation during fungal-associated allergic airway inflammation. Am J Physiol Lung Cell Mol Physiol 2021; 320:L615-L626. [PMID: 33533316 DOI: 10.1152/ajplung.00528.2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Joseph J Mackel
- Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama
| | - Jaleesa M Garth
- Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama
| | - MaryJane Jones
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana
| | - Diandra A Ellis
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana
| | | | - Zhihong Yu
- Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama
| | - Sadis Matalon
- Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama
| | - Miranda Curtiss
- Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama.,Department of Microbiology, University of Alabama Birmingham, Birmingham, Alabama
| | - Frances E Lund
- Department of Microbiology, University of Alabama Birmingham, Birmingham, Alabama
| | - Annette T Hastie
- Department of Medicine, Wake Forest University, Winston-Salem, North Carolina
| | | | - Chad Steele
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana
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9
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Li XP, Zhang J. A live attenuated Edwardsiella tarda vaccine induces immunological expression pattern in Japanese flounder (Paralichthys olivaceus) in the early phase of immunization. Comp Biochem Physiol C Toxicol Pharmacol 2021; 239:108872. [PMID: 32814144 DOI: 10.1016/j.cbpc.2020.108872] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 08/03/2020] [Accepted: 08/09/2020] [Indexed: 12/29/2022]
Abstract
A previous study showed that an attenuated Edwardsiella tarda strain, TXhfq, as a live vaccine could elicit protective immune effects in fish against E. tarda infection. In the current study, in order to clarify the molecular mechanism of fish immune response at the early stage after TXhfq vaccination, RNA-Seq technology was used to compare the transcriptomes of skin, intestine, and spleen between bath-vaccinated and unvaccinated Japanese flounder (Paralichthys olivaceus). An average of 46.6 million clean reads per library was obtained, ~88.04% of which were successfully mapped to the reference genome, and approximately 24,600 genes were detected in each sample. A total of 565, 878, and 1258 differential expression genes (DEGs) were found in skin, intestine, and spleen, respectively, including 1263 up-regulated genes and 1438 down-regulated genes. The DEGs exhibited different characteristics in each tissue. One hundred and sixteen DEGs belonging to six immune related categories were scrutinized, i.e., inflammatory factors, cytokines, complement and coagulation system, mucins, phagocytosis, and antigen processing and presentation. A protein-protein interaction network was constructed to get the interaction network between immune genes during the early stage of immunization. The top six hub genes highly regulated by TXhfq formed complicated interaction relationship with each other, which were involved in immune processes, notably inflammation and phagocytosis. Our results provide valuable information for the understanding of the immune mechanism underlying the protection of live attenuated vaccines in fish.
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Affiliation(s)
- Xue-Peng Li
- CAS Key Laboratory of Experimental Marine Biology, CAS Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; School of Ocean, Yantai University, Yantai, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Jian Zhang
- CAS Key Laboratory of Experimental Marine Biology, CAS Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; School of Ocean, Yantai University, Yantai, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China.
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10
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Satitsri S, Muanprasat C. Chitin and Chitosan Derivatives as Biomaterial Resources for Biological and Biomedical Applications. Molecules 2020; 25:molecules25245961. [PMID: 33339290 PMCID: PMC7766609 DOI: 10.3390/molecules25245961] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 12/09/2020] [Accepted: 12/10/2020] [Indexed: 01/30/2023] Open
Abstract
Chitin is a long-chain polymer of N-acetyl-glucosamine, which is regularly found in the exoskeleton of arthropods including insects, shellfish and the cell wall of fungi. It has been known that chitin can be used for biological and biomedical applications, especially as a biomaterial for tissue repairing, encapsulating drug for drug delivery. However, chitin has been postulated as an inducer of proinflammatory cytokines and certain diseases including asthma. Likewise, chitosan, a long-chain polymer of N-acetyl-glucosamine and d-glucosamine derived from chitin deacetylation, and chitosan oligosaccharide, a short chain polymer, have been known for their potential therapeutic effects, including anti-inflammatory, antioxidant, antidiarrheal, and anti-Alzheimer effects. This review summarizes potential utilization and limitation of chitin, chitosan and chitosan oligosaccharide in a variety of diseases. Furthermore, future direction of research and development of chitin, chitosan, and chitosan oligosaccharide for biomedical applications is discussed.
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11
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Godwin MS, Jones M, Blackburn JP, Yu Z, Matalon S, Hastie AT, Meyers DA, Steele C. The chemokine CX3CL1/fractalkine regulates immunopathogenesis during fungal-associated allergic airway inflammation. Am J Physiol Lung Cell Mol Physiol 2020; 320:L393-L404. [PMID: 33325803 DOI: 10.1152/ajplung.00376.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Individuals that present with difficult-to-control asthma and sensitivity to one or more fungal species are categorized as a subset of severe asthma patients belonging to a group herein referred to as severe asthma with fungal sensitization (SAFS). We have previously reported the identification of numerous cytokines and chemokines that were elevated in human asthmatics that were sensitized to fungi vs. nonfungal sensitized asthmatics. Here, we show that the unique chemokine CX3CL1 (fractalkine) is elevated in both bronchoalveolar lavage fluid and sputum from human asthmatics sensitized to fungi, implicating an association with CX3CL1 in fungal asthma severity. In an experimental model of fungal-associated allergic airway inflammation, we demonstrate that the absence of CX3CR1 signaling unexpectedly resulted in a profound impairment in lung function. Histological assessment of lung tissue revealed an unrestricted inflammatory response that was subsequently characterized by enhanced levels of neutrophils, eosinophils, and inflammatory monocytes. Neutrophilic inflammation correlated with elevated IL-17A, proinflammatory cytokines (TNF-α, IL-1α, and IL-1β), neutrophil survival factors (granulocyte colony-stimulating factor), and neutrophil-targeting chemokines (CCL3 and CCL4). Eosinophilia correlated with elevated type 2 responses (IL-5 and IL-13) whereas inflammatory monocyte levels correlated with elevated type 1 responses (IFN-γ and CXCL9) and survival factors (macrophage colony-stimulating factor). Despite enhanced inflammatory responses, the immunoregulatory cytokine IL-10 and the natural inhibitor of IL-1 signaling, IL-1RA, were significantly elevated rather than impaired. Regulatory T-cell levels were unchanged, as were levels of the anti-inflammatory cytokines IL-35 and IL-38. Taken together, the CX3CL1/CX3CR1 axis preserves lung function during fungal-associated allergic airway inflammation through a nonclassical immunoregulatory mechanism.
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Affiliation(s)
- Matthew S Godwin
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana
| | - MaryJane Jones
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana
| | - Jonathan P Blackburn
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Zhihong Yu
- Department of Anesthesiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Sadis Matalon
- Department of Anesthesiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Annette T Hastie
- Department of Medicine, Wake Forest University, Winston-Salem, North Carolina
| | | | - Chad Steele
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana
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12
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Koralewski R, Dymek B, Mazur M, Sklepkiewicz P, Olejniczak S, Czestkowski W, Matyszewski K, Andryianau G, Niedziejko P, Kowalski M, Gruza M, Borek B, Jedrzejczak K, Bartoszewicz A, Pluta E, Rymaszewska A, Kania M, Rejczak T, Piasecka S, Mlacki M, Mazurkiewicz M, Piotrowicz M, Salamon M, Zagozdzon A, Napiorkowska-Gromadzka A, Bartlomiejczak A, Mozga W, Dobrzański P, Dzwonek K, Golab J, Nowotny M, Olczak J, Golebiowski A. Discovery of OATD-01, a First-in-Class Chitinase Inhibitor as Potential New Therapeutics for Idiopathic Pulmonary Fibrosis. J Med Chem 2020; 63:15527-15540. [PMID: 33078933 DOI: 10.1021/acs.jmedchem.0c01179] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Chitotriosidase (CHIT1) and acidic mammalian chitinase (AMCase) are the enzymatically active chitinases that have been implicated in the pathology of chronic lung diseases such as asthma and interstitial lung diseases (ILDs), including idiopathic pulmonary fibrosis (IPF) and sarcoidosis. The clinical and preclinical data suggest that pharmacological inhibition of CHIT1 might represent a novel therapeutic approach in IPF. Structural modification of an advanced lead molecule 3 led to the identification of compound 9 (OATD-01), a highly active CHIT1 inhibitor with both an excellent PK profile in multiple species and selectivity against a panel of other off-targets. OATD-01 given orally once daily in a range of doses between 30 and 100 mg/kg showed significant antifibrotic efficacy in an animal model of bleomycin-induced pulmonary fibrosis. OATD-01 is the first-in-class CHIT1 inhibitor, currently completed phase 1b of clinical trials, to be a potential treatment for IPF.
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Affiliation(s)
- Robert Koralewski
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Barbara Dymek
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Marzena Mazur
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | | | - Sylwia Olejniczak
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | | | | | - Gleb Andryianau
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Piotr Niedziejko
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Michal Kowalski
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Mariusz Gruza
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Bartłomiej Borek
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Karol Jedrzejczak
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | | | - Elżbieta Pluta
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | | | - Magdalena Kania
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Tomasz Rejczak
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Sylwia Piasecka
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Michal Mlacki
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | | | - Michał Piotrowicz
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Magdalena Salamon
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | | | | | - Aneta Bartlomiejczak
- Structural Biology Center, International Institute of Molecular and Cell Biology, Trojdena 4, 02-109 Warsaw, Poland
| | - Witold Mozga
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Paweł Dobrzański
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Karolina Dzwonek
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Jakub Golab
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland.,Department of Immunology, Medical University of Warsaw, Nielubowicza 5, 02-097 Warsaw, Poland
| | - Marcin Nowotny
- Structural Biology Center, International Institute of Molecular and Cell Biology, Trojdena 4, 02-109 Warsaw, Poland
| | - Jacek Olczak
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Adam Golebiowski
- OncoArendi Therapeutics SA, Żwirki i Wigury 101, 02-089 Warsaw, Poland
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13
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Chang D, Sharma L, Dela Cruz CS. Chitotriosidase: a marker and modulator of lung disease. Eur Respir Rev 2020; 29:29/156/190143. [PMID: 32350087 PMCID: PMC9488994 DOI: 10.1183/16000617.0143-2019] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 12/02/2019] [Indexed: 12/18/2022] Open
Abstract
Chitotriosidase (CHIT1) is a highly conserved and regulated chitinase secreted by activated macrophages; it is a member of the 18-glycosylase family (GH18). CHIT1 is the most prominent chitinase in humans, can cleave chitin and participates in the body's immune response and is associated with inflammation, infection, tissue damage and remodelling processes. Recently, CHIT1 has been reported to be involved in the molecular pathogenesis of pulmonary fibrosis, bronchial asthma, COPD and pulmonary infections, shedding new light on the role of these proteins in lung pathophysiology. The potential roles of CHIT1 in lung diseases are reviewed in this article. This is the first review of chitotriosidase in lung diseasehttp://bit.ly/2LpZUQI
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Affiliation(s)
- De Chang
- The 3rd Medical Center of Chinese PLA General Hospital, Beijing, China.,Section of Pulmonary and Critical Care and Sleep Medicine, Dept of Medicine, Yale University School of Medicine, New Haven, CT, USA.,Both authors contributed equally
| | - Lokesh Sharma
- Section of Pulmonary and Critical Care and Sleep Medicine, Dept of Medicine, Yale University School of Medicine, New Haven, CT, USA.,Both authors contributed equally
| | - Charles S Dela Cruz
- Section of Pulmonary and Critical Care and Sleep Medicine, Dept of Medicine, Yale University School of Medicine, New Haven, CT, USA
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14
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Godwin MS, Reeder KM, Garth JM, Blackburn JP, Jones M, Yu Z, Matalon S, Hastie AT, Meyers DA, Steele C. IL-1RA regulates immunopathogenesis during fungal-associated allergic airway inflammation. JCI Insight 2019; 4:129055. [PMID: 31550242 DOI: 10.1172/jci.insight.129055] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 09/19/2019] [Indexed: 12/12/2022] Open
Abstract
Severe asthma with fungal sensitization (SAFS) defines a subset of human asthmatics with allergy to 1 or more fungal species and difficult-to-control asthma. We have previously reported that human asthmatics sensitized to fungi have worse lung function and a higher degree of atopy, which was associated with higher IL-1 receptor antagonist (IL-1RA) levels in bronchoalveolar lavage fluid. IL-1RA further demonstrated a significant negative association with bronchial hyperresponsiveness to methacholine. Here, we show that IL-1α and IL-1β are elevated in both bronchoalveolar lavage fluid and sputum from human asthmatics sensitized to fungi, implicating an association with IL-1α, IL-1β, or IL-1RA in fungal asthma severity. In an experimental model of fungal-associated allergic airway inflammation, we demonstrate that IL-1R1 signaling promotes type 1 (IFN-γ, CXCL9, CXCL10) and type 17 (IL-17A, IL-22) responses that were associated with neutrophilic inflammation and increased airway hyperreactivity. Each of these were exacerbated in the absence of IL-1RA. Administration of human recombinant IL-1RA (Kineret/anakinra) during fungal-associated allergic airway inflammation improved airway hyperreactivity and lowered type 1 and type 17 responses. Taken together, these data suggest that IL-1R1 signaling contributes to fungal asthma severity via immunopathogenic type 1 and type 17 responses and can be targeted for improving allergic asthma severity.
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Affiliation(s)
- Matthew S Godwin
- Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - Kristen M Reeder
- Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - Jaleesa M Garth
- Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - Jonathan P Blackburn
- Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - MaryJane Jones
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana, USA
| | - Zhihong Yu
- Department of Anesthesiology, UAB, Birmingham, Alabama, USA
| | - Sadis Matalon
- Department of Anesthesiology, UAB, Birmingham, Alabama, USA
| | - Annette T Hastie
- Department of Medicine, Wake Forest University, Winston-Salem, North Carolina, USA
| | - Deborah A Meyers
- Department of Medicine, University of Arizona, Tucson, Arizona, USA
| | - Chad Steele
- Department of Microbiology and Immunology, Tulane University, New Orleans, Louisiana, USA
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15
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Mazur M, Dymek B, Koralewski R, Sklepkiewicz P, Olejniczak S, Mazurkiewicz M, Piotrowicz M, Salamon M, Jędrzejczak K, Zagozdzon A, Czestkowski W, Matyszewski K, Borek B, Bartoszewicz A, Pluta E, Rymaszewska A, Mozga W, Stefaniak F, Dobrzański P, Dzwonek K, Golab J, Golebiowski A, Olczak J. Development of Dual Chitinase Inhibitors as Potential New Treatment for Respiratory System Diseases. J Med Chem 2019; 62:7126-7145. [PMID: 31291098 DOI: 10.1021/acs.jmedchem.9b00681] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Acidic mammalian chitinase (AMCase) and chitotriosidase-1 (CHIT1) are two enzymatically active proteins produced by mammals capable of cleaving the glycosidic bond in chitin. Based on the clinical findings and animal model studies, involvement of chitinases has been suggested in several respiratory system diseases including asthma, COPD, and idiopathic pulmonary fibrosis. Exploration of structure-activity relationships within the series of 1-(3-amino-1H-1,2,4-triazol-5-yl)-piperidin-4-amines, which was earlier identified as a scaffold of potent AMCase inhibitors, led us to discover highly active dual (i.e., AMCase and CHIT1) inhibitors with very good pharmacokinetic properties. Among them, compound 30 was shown to reduce the total number of cells in bronchoalveolar lavage fluid of mice challenged with house dust mite extract after oral administration (50 mg/kg, qd). In addition, affinity toward the hERG potassium channel of compound 30 was significantly reduced when compared to the earlier reported chitinase inhibitors.
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Affiliation(s)
- Marzena Mazur
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Barbara Dymek
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Robert Koralewski
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Piotr Sklepkiewicz
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Sylwia Olejniczak
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | | | - Michał Piotrowicz
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Magdalena Salamon
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Karol Jędrzejczak
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | | | | | | | - Bartłomiej Borek
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | | | - Elżbieta Pluta
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | | | - Witold Mozga
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Filip Stefaniak
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland.,Laboratory of Bioinformatics and Protein Engineering , International Institute of Molecular and Cell Biology in Warsaw , Ks. Trojdena 4 , 02-109 Warsaw , Poland
| | - Paweł Dobrzański
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Karolina Dzwonek
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Jakub Golab
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland.,Department of Immunology , Medical University of Warsaw , Nielubowicza 5 , 02-097 Warsaw , Poland
| | - Adam Golebiowski
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
| | - Jacek Olczak
- OncoArendi Therapeutics SA , Żwirki i Wigury 101 , 02-089 Warsaw , Poland
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16
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de Jesus Carrion S, Abbondante S, Clark HL, Marshall ME, Mouyna I, Beauvais A, Sun Y, Taylor PR, Leal SM, Armstrong B, Carrera W, Latge JP, Pearlman E. Aspergillus fumigatus corneal infection is regulated by chitin synthases and by neutrophil-derived acidic mammalian chitinase. Eur J Immunol 2019; 49:918-927. [PMID: 30903663 PMCID: PMC6999821 DOI: 10.1002/eji.201847851] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 01/24/2019] [Accepted: 03/19/2019] [Indexed: 01/14/2023]
Abstract
Aspergillus fumigatus is an important cause of pulmonary and systemic infections in immune compromised individuals, and of corneal ulcers and blindness in immune competent patients. To examine the role of chitin synthases in Aspergillus corneal infection, we analyzed Aspergillus mutants of chitin synthase family 1 and family 2, and found that compared with the parent strain, the quadruple mutants from both families were more readily killed by neutrophils in vitro, and that both also exhibited impaired hyphal growth in the cornea. Further, inhibition of chitin synthases using Nikkomycin Z enhanced neutrophil killing in vitro and in vivo in a murine model of A. fumigatus corneal infection. Acidic mammalian chitinase (AMCase) is mostly produced by macrophages in asthmatic lungs; however, we now demonstrate that neutrophils are a major source of AMCase, which inhibits hyphal growth. In A. fumigatus corneal infection, neutrophils are the major source of AMCase, and addition of AMCase inhibitors or adoptive transfer of neutrophils from AMCase-/- mice resulted in impaired hyphal killing. Together, these findings identify chitin synthases as important fungal virulence factors and neutrophil-derived AMCase as an essential mediator of host defense.
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Affiliation(s)
- Steven de Jesus Carrion
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | | | - Heather L. Clark
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | | | | | - Anne Beauvais
- Unité des Aspergillus, Institut Pasteur, Paris, France
| | - Yan Sun
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | - Patricia R. Taylor
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | - Sixto M. Leal
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | - Brittany Armstrong
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | - William Carrera
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | | | - Eric Pearlman
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, USA,Department of Ophthalmology, University of California, Irvine, USA
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17
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Zacharias CA, Sheppard DC. The role of Aspergillus fumigatus polysaccharides in host-pathogen interactions. Curr Opin Microbiol 2019; 52:20-26. [PMID: 31121411 DOI: 10.1016/j.mib.2019.04.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 04/10/2019] [Accepted: 04/17/2019] [Indexed: 02/06/2023]
Abstract
Aspergillus fumigatus is a saprophytic mold that can cause infection in patients with impaired immunity or chronic lung diseases. The polysaccharide-rich cell wall of this fungus is a key point of contact with the host immune system. The availability of purified cell wall polysaccharides and mutant strains deficient in the production of these glycans has revealed that these glycans play an important role in the pathogenesis of A. fumigatus infections. Herein, we review our current understanding of the key polysaccharides present within the A. fumigatus cell wall, and their interactions with host cells and secreted factors during infection.
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Affiliation(s)
- Caitlin A Zacharias
- Department of Microbiology and Immunology, McGill University, Montreal, QC H3A 2B4, Canada; Department of Medicine, Infectious Diseases and Immunity in Global Health Program, Centre for Translational Biology, McGill University Health Centre, Montreal, QC H4A 3J1, Canada
| | - Donald C Sheppard
- Department of Microbiology and Immunology, McGill University, Montreal, QC H3A 2B4, Canada; Department of Medicine, Infectious Diseases and Immunity in Global Health Program, Centre for Translational Biology, McGill University Health Centre, Montreal, QC H4A 3J1, Canada.
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18
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Mackel JJ, Steele C. Host defense mechanisms against Aspergillus fumigatus lung colonization and invasion. Curr Opin Microbiol 2019; 52:14-19. [PMID: 31103956 DOI: 10.1016/j.mib.2019.04.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 04/11/2019] [Indexed: 12/13/2022]
Abstract
The human lung is continually exposed to airborne conidia of the fungus Aspergillus fumigatus (AF) and related species. The innate immune system efficiently eliminates inhaled AF conidia from the lung in normal individuals, but immunocompromised patients are at risk for highly lethal invasive aspergillosis (IA). Some individuals not at risk for IA may still suffer from failed clearance of AF in the form of noninvasive colonization associated with conditions such as allergic bronchopulmonary aspergillosis. Understanding of normal innate immune function against AF as well as failures of these functions will enable better treatment of these patient groups. In this review, we will focus on recent research that elucidates mechanisms of host defense and their failures resulting in colonization as well as tissue invasion.
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Affiliation(s)
- Joseph J Mackel
- Department of Microbiology and Immunology, Tulane University, New Orleans, LA, United States
| | - Chad Steele
- Department of Microbiology and Immunology, Tulane University, New Orleans, LA, United States.
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19
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Targeting Cytokines as Evolving Treatment Strategies in Chronic Inflammatory Airway Diseases. Int J Mol Sci 2018; 19:ijms19113402. [PMID: 30380761 PMCID: PMC6275012 DOI: 10.3390/ijms19113402] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 10/25/2018] [Accepted: 10/27/2018] [Indexed: 12/13/2022] Open
Abstract
Cytokines are key players in the initiation and propagation of inflammation in chronic inflammatory airway diseases such as chronic obstructive pulmonary disease (COPD), bronchiectasis and allergic asthma. This makes them attractive targets for specific novel anti-inflammatory treatment strategies. Recently, both interleukin-1 (IL-1) and IL-6 have been associated with negative health outcomes, mortality and a pro-inflammatory phenotype in COPD. IL-6 in COPD was shown to correlate negatively with lung function, and IL-1beta was induced by cigarette smoke in the bronchial epithelium, causing airway inflammation. Furthermore, IL-8 has been shown to be a pro-inflammatory marker in bronchiectasis, COPD and allergic asthma. Clinical trials using specific cytokine blockade therapies are currently emerging and have contributed to reduce exacerbations and steroid use in COPD. Here, we present a review of the current understanding of the roles of cytokines in the pathophysiology of chronic inflammatory airway diseases. Furthermore, outcomes of clinical trials in cytokine blockade as novel treatment strategies for selected patient populations with those diseases will be discussed.
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