1
|
Zhou X, Ma S, Xu Y, Sun C, Liao J, Song M, Li G, Yuchen L, Chen P, Hu Y, Wang Y, Yu B. Nicotine promotes Staphylococcus aureus-induced osteomyelitis by activating the Nrf2/Slc7a11 signaling axis. Int Immunopharmacol 2024; 135:112223. [PMID: 38772295 DOI: 10.1016/j.intimp.2024.112223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 05/03/2024] [Accepted: 05/05/2024] [Indexed: 05/23/2024]
Abstract
Although smoking is a significant risk factor for osteomyelitis, there is limited experimental evidence that nicotine, a key tobacco constituent, is associated with this condition, leaving its mechanistic implications uncharacterized. This study revealed that nicotine promotes Staphylococcus aureus-induced osteomyelitis by increasing Nrf2 and Slc7a11 expression in vivo and in vitro. Inhibition of Slc7a11 using Erastin augmented bacterial phagocytosis/killing capabilities and fortified antimicrobial responses in an osteomyelitis model. Moreover, untargeted metabolomic analysis demonstrated that Erastin mitigated the effects of nicotine on S. aureus-induced osteomyelitis by altering glutamate/glutathione metabolism. These findings suggest that nicotine aggravates S. aureus-induced osteomyelitis by activating the Nrf2/Slc7a11 signaling pathway and that Slc7a11 inhibition can counteract the detrimental health effects of nicotine.
Collapse
Affiliation(s)
- Xuyou Zhou
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Sushuang Ma
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, The Fifth Affiliated Hospital, Southerm Medical University, Guangzhou, China
| | - Yuan Xu
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Chongkai Sun
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Juncheng Liao
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Mingrui Song
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Guanzhi Li
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Liu Yuchen
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Peng Chen
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopedics, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, China
| | - Yanjun Hu
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yutian Wang
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China.
| | - Bin Yu
- Guangdong Provincial Key Laboratory of Bone and Cartilage Regenerative Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, China.
| |
Collapse
|
2
|
Sistanizad M, Salarian S, Kouchek M, Shojaei S, Miri M, Masbough F. Effect of calcitriol supplementation on infectious biomarkers in patients with positive systemic inflammatory response: A Randomized Controlled Trial. Ann Med Surg (Lond) 2024; 86:875-880. [PMID: 38333320 PMCID: PMC10849351 DOI: 10.1097/ms9.0000000000001643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 12/10/2023] [Indexed: 02/10/2024] Open
Abstract
Background Sepsis is one of the common causes of hospitalization of patients in intensive care units. A significant role for vitamin D in sepsis has been proposed, which is due to its active metabolite, calcitriol. Aims Evaluate the effect of calcitriol supplementation on infectious biomarkers, including procalcitonin and presepsin. Methods Patients with sepsis were divided into intervention and control group. Patients in the intervention group received intravenous calcitriol daily for 3 days. The serum levels of procalcitonin and presepsin were evaluated on days 0, 3, and 5 after administration. Results Fifty-two SIRS-positive patients were evaluated. Baseline characteristics, changes in Sequential Organ Failure Assessment (SOFA) score and blood levels of vitamin D were not significantly different between the two groups. Procalcitonin levels on day 5 and the differences between day 5 and 0 were significantly lower in the intervention group (P = 0.02). Presepsin on the third and fifth days in the intervention group was reduced, but in the control group, there was an ascending trend. However, there was no significant difference between the two groups on days 3 and 5 (P = 0.17 and P = 0.06, respectively) or between days 3 as well as 5 and the baseline presepsin level (P = 0.93 and P = 0.92, respectively). The ICU length of stay and 28-day mortality did not differ significantly either between the two arms of the study. Conclusions Finally, the results of this study showed that the administration of intravenous calcitriol could reduce the levels of procalcitonin but did not have a significant effect on presepsin.
Collapse
Affiliation(s)
- Mohammad Sistanizad
- Department of Clinical Pharmacy, School of Pharmacy
- Prevention of Cardiovascular Disease Research Center
| | - Sara Salarian
- Department of Critical Care Medicine, Imam Hossein Medical and Educational Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehran Kouchek
- Department of Critical Care Medicine, Imam Hossein Medical and Educational Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyedpouzhia Shojaei
- Department of Critical Care Medicine, Imam Hossein Medical and Educational Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - MirMohammad Miri
- Department of Critical Care Medicine, Imam Hossein Medical and Educational Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | |
Collapse
|
3
|
Jastrząb B, Szepietowski JC, Matusiak Ł. Hidradenitis suppurativa and follicular occlusion syndrome: Where is the pathogenetic link? Clin Dermatol 2023; 41:576-583. [PMID: 37690621 DOI: 10.1016/j.clindermatol.2023.08.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
The follicular occlusion tetrad complex encompasses several entities (hidradenitis suppurativa, acne conglobata, dissecting cellulitis of the scalp, and pilonidal cyst) that share common clinical features, risk factors, and pathophysiology. Follicular occlusion is a crucial triggering mechanism in the etiology in each of these disorders, leading to development of distinctive skin lesions such as deep-seated nodules, abscesses, comedones, and draining sinuses, often with accompanying scarring. Despite the fact that the follicular occlusion tetrad components manifest multiple similarities, they also exhibit many differences among themselves and require individual approaches and treatment.
Collapse
Affiliation(s)
- Beata Jastrząb
- Department of Dermatology, Venereology, and Allergology, Wroclaw Medical University, Wroclaw, Poland
| | - Jacek C Szepietowski
- Department of Dermatology, Venereology, and Allergology, Wroclaw Medical University, Wroclaw, Poland.
| | - Łukasz Matusiak
- Department of Dermatology, Venereology, and Allergology, Wroclaw Medical University, Wroclaw, Poland
| |
Collapse
|
4
|
Witte K, Wolk K, Witte-Händel E, Krause T, Kokolakis G, Sabat R. Targeting Metabolic Syndrome in Hidradenitis Suppurativa by Phytochemicals as a Potential Complementary Therapeutic Strategy. Nutrients 2023; 15:3797. [PMID: 37686829 PMCID: PMC10490062 DOI: 10.3390/nu15173797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 08/09/2023] [Accepted: 08/21/2023] [Indexed: 09/10/2023] Open
Abstract
Hidradenitis suppurativa (HS) is a chronic inflammatory disease characterized by the appearance of painful inflamed nodules, abscesses, and pus-draining sinus tracts in the intertriginous skin of the groins, buttocks, and perianal and axillary regions. Despite its high prevalence of ~0.4-1%, therapeutic options for HS are still limited. Over the past 10 years, it has become clear that HS is a systemic disease, associated with various comorbidities, including metabolic syndrome (MetS) and its sequelae. Accordingly, the life expectancy of HS patients is significantly reduced. MetS, in particular, obesity, can support sustained inflammation and thereby exacerbate skin manifestations and the chronification of HS. However, MetS actually lacks necessary attention in HS therapy, underlining the high medical need for novel therapeutic options. This review directs attention towards the relevance of MetS in HS and evaluates the potential of phytomedical drug candidates to alleviate its components. It starts by describing key facts about HS, the specifics of metabolic alterations in HS patients, and mechanisms by which obesity may exacerbate HS skin alterations. Then, the results from the preclinical studies with phytochemicals on MetS parameters are evaluated and the outcomes of respective randomized controlled clinical trials in healthy people and patients without HS are presented.
Collapse
Affiliation(s)
- Katrin Witte
- Psoriasis Research and Treatment Center, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
- Inflammation and Regeneration of Skin, BIH Center for Regenerative Therapies, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 13353 Berlin, Germany
| | - Kerstin Wolk
- Psoriasis Research and Treatment Center, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
- Inflammation and Regeneration of Skin, BIH Center for Regenerative Therapies, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 13353 Berlin, Germany
| | - Ellen Witte-Händel
- Psoriasis Research and Treatment Center, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Torben Krause
- Psoriasis Research and Treatment Center, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Georgios Kokolakis
- Psoriasis Research and Treatment Center, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Robert Sabat
- Psoriasis Research and Treatment Center, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| |
Collapse
|
5
|
Woodhams DC, McCartney J, Walke JB, Whetstone R. The adaptive microbiome hypothesis and immune interactions in amphibian mucus. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2023; 145:104690. [PMID: 37001710 PMCID: PMC10249470 DOI: 10.1016/j.dci.2023.104690] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 03/21/2023] [Accepted: 03/22/2023] [Indexed: 05/20/2023]
Abstract
The microbiome is known to provide benefits to hosts, including extension of immune function. Amphibians are a powerful immunological model for examining mucosal defenses because of an accessible epithelial mucosome throughout their developmental trajectory, their responsiveness to experimental treatments, and direct interactions with emerging infectious pathogens. We review amphibian skin mucus components and describe the adaptive microbiome as a novel process of disease resilience where competitive microbial interactions couple with host immune responses to select for functions beneficial to the host. We demonstrate microbiome diversity, specificity of function, and mechanisms for memory characteristic of an adaptive immune response. At a time when industrialization has been linked to losses in microbiota important for host health, applications of microbial therapies such as probiotics may contribute to immunotherapeutics and to conservation efforts for species currently threatened by emerging diseases.
Collapse
Affiliation(s)
- Douglas C Woodhams
- Department of Biology, University of Massachusetts Boston, Boston, MA, 02125, USA.
| | - Julia McCartney
- Department of Biology, University of Massachusetts Boston, Boston, MA, 02125, USA
| | - Jenifer B Walke
- Department of Biology, Eastern Washington University, Cheney, WA, 99004-2440, USA
| | - Ross Whetstone
- Department of Biology, University of Massachusetts Boston, Boston, MA, 02125, USA
| |
Collapse
|
6
|
Nicotine Affects Multiple Biological Processes in EpiDermTM Organotypic Tissues and Keratinocyte Monolayers. ATMOSPHERE 2022. [DOI: 10.3390/atmos13050810] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Dermal exposure to nicotine is common due to the widespread use of tobacco products. Here, we assessed the effects of nicotine at concentrations found in thirdhand smoke (THS) contaminated environments and electronic cigarette (EC) spills or leaks on a 3D human skin model (EpiDermTM) and on submerged keratinocyte cultures. Air liquid interface treatment of EpiDermTM with 10 or 400 μg/mL of nicotine for 24 h followed by proteomics analysis showed altered pathways related to inflammation, protein synthesis, cell–cell adhesion, apoptosis, and mitochondrial function. Submerged cultured keratinocytes were used to validate the proteomics data and further characterize the response of skin cells to nicotine. Mitochondrial phenotype changed from networked to punctate in keratinocytes treated with 10 or 400 μg/mL of nicotine for 48 h and 24 h, respectively. After 72 h, all concentrations of nicotine caused a significant decrease in the networked phenotype. In Western blots, keratinocytes exposed to 400 μg/mL of nicotine had a significant decrease in mitofusin 2, while mitofusin 1 decreased after 72 h. The shift from networked to punctate mitochondria correlated with a decrease in mitofusin 1/2, a protein needed to establish and maintain the networked phenotype. Mitochondrial changes were reversible after a 24 h recovery period. Peroxisomes exposed to 400 μg/mL of nicotine for 24 h became enlarged and were fewer in number. Nicotine concentrations in THS and EC spills altered the proteome profile in EpiDermTM and damaged organelles including mitochondria and peroxisomes, which are involved in ROS homeostasis. These changes may exacerbate skin infections, inhibit wound healing, and cause oxidative damage to cells in the skin.
Collapse
|
7
|
Chrna5 is overexpressed in psoriasis patients and promotes psoriasis-like inflammation in mouse models. J Invest Dermatol 2022; 142:2978-2987.e6. [PMID: 35513071 DOI: 10.1016/j.jid.2022.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 04/05/2022] [Accepted: 04/07/2022] [Indexed: 11/20/2022]
Abstract
It is well known that psoriasis is closely related to smoking, and the cholinergic receptor nicotinic subunit alpha-5 (Chrna5) plays an important role in smoking-related diseases. However, studies on the relationship between Chrna5 and psoriasis are limited. This study aimed to examine the role of Chrna5 in psoriasis development and pathogenesis. Analysis in psoriatic tissues and imiquimod (IMQ)-induced mouse models showed that Chrna5 was highly expressed in psoriatic lesional skin. To further verify the function of Chrna5, we constructed Chrna5-knockout mice and induced the psoriasis model. We found that Chrna5 knockout significantly reduced the severity of psoriasis and could regulate inflammation via the mitogen-activated protein kinase kinase kinase 1 (MEKK1)/c-Jun NH(2)-terminal kinase (JNK)-MAPK/NF-κB pathway. The single-cell sequencing results revealed that after Chrna5 knockout, the keratinocyte subpopulation was significantly reduced and the related Janus kinase/signal transduction and activator of transcription (JAK/STAT) signaling pathway was downregulated, further indicating the importance of Chrna5 in psoriasis. Human keratinocytes were analyzed, and silencing Chrna5 inhibited keratinocyte proliferation and migration. In summary, Chrna5 played important roles in the development and pathogenesis of psoriasis, and targeting Chrna5 may be an effective strategy for the treatment of psoriasis.
Collapse
|
8
|
Patel BK, Patel KH, Huang RY, Lee CN, Moochhala SM. The Gut-Skin Microbiota Axis and Its Role in Diabetic Wound Healing-A Review Based on Current Literature. Int J Mol Sci 2022; 23:ijms23042375. [PMID: 35216488 PMCID: PMC8880500 DOI: 10.3390/ijms23042375] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 12/18/2022] Open
Abstract
Diabetic foot ulcers (DFU) are a growing concern worldwide as they pose complications in routine clinical practices such as diagnosis and management. Bacterial interactions on the skin surface are vital to the pathophysiology of DFU and may control delayed wound healing. The microbiota from our skin directly regulates cutaneous health and disease by interacting with the numerous cells involved in the wound healing mechanism. Commensal microbiota, in particular, interact with wound-repairing skin cells to enhance barrier regeneration. The observed microbes in DFU include Staphylococcus, Streptococcus, Corynebacterium, Pseudomonas, and several anaerobes. Skin commensal microbes, namely S. epidermidis, can regulate the gamma delta T cells and induce Perforin-2 expression. The increased expression of Perforin-2 by skin cells destroyed S. aureus within the cells, facilitating wound healing. Possible crosstalk between the human commensal microbiome and different cell types involved in cutaneous wound healing promotes the immune response and helps to maintain the barrier function in humans. Wound healing is a highly well-coordinated, complex mechanism; it can be devastating if interrupted. Skin microbiomes are being studied in relation to the gut-skin axis along with their effects on dermatologic conditions. The gut-skin axis illustrates the connection wherein the gut can impact skin health due to its immunological and metabolic properties. The precise mechanism underlying gut-skin microbial interactions is still unidentified, but the immune and endocrine systems are likely to be involved. Next-generation sequencing and the development of bioinformatics pipelines may considerably improve the understanding of the microbiome-skin axis involved in diabetic wound healing in a much more sophisticated way. We endeavor to shed light on the importance of these pathways in the pathomechanisms of the most prevalent inflammatory conditions including the diabetes wound healing, as well as how probiotics may intervene in the gut-skin axis.
Collapse
Affiliation(s)
- Bharati Kadamb Patel
- Department of Surgery, National University of Singapore, Singapore 119228, Singapore; (B.K.P.); (C.N.L.)
| | | | - Ryan Yuki Huang
- Canyon Crest Academy, San Diego, CA 92130, USA;
- Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA 92093, USA
| | - Chuen Neng Lee
- Department of Surgery, National University of Singapore, Singapore 119228, Singapore; (B.K.P.); (C.N.L.)
| | - Shabbir M. Moochhala
- Department of Surgery, National University of Singapore, Singapore 119228, Singapore; (B.K.P.); (C.N.L.)
- Department of Pharmacology, National University of Singapore, Singapore 117600, Singapore
- Correspondence:
| |
Collapse
|
9
|
He X, Wang L, Liu L, Gao J, Long B, Chi F, Hu T, Wan Y, Gong Z, Li L, Zhen P, Zhang T, Cao H, Huang SH. Endogenous α7 nAChR Agonist SLURP1 Facilitates Escherichia coli K1 Crossing the Blood-Brain Barrier. Front Immunol 2021; 12:745854. [PMID: 34721415 PMCID: PMC8552013 DOI: 10.3389/fimmu.2021.745854] [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] [Received: 07/22/2021] [Accepted: 09/13/2021] [Indexed: 12/11/2022] Open
Abstract
Alpha 7 nicotinic acetylcholine receptor (α7 nAChR) is critical for the pathogenesis of Escherichia coli (E. coli) K1 meningitis, a severe central nervous system infection of the neonates. However, little is known about how E. coli K1 manipulates α7 nAChR signaling. Here, through employing immortalized cell lines, animal models, and human transcriptional analysis, we showed that E. coli K1 infection triggers releasing of secreted Ly6/Plaur domain containing 1 (SLURP1), an endogenous α7 nAChR ligand. Exogenous supplement of SLURP1, combined with SLURP1 knockdown or overexpression cell lines, showed that SLURP1 is required for E. coli K1 invasion and neutrophils migrating across the blood-brain barrier (BBB). Furthermore, we found that SLURP1 is required for E. coli K1-induced α7 nAChR activation. Finally, the promoting effects of SLURP1 on the pathogenesis of E. coli K1 meningitis was significantly abolished in the α7 nAChR knockout mice. These results reveal that E. coli K1 exploits SLURP1 to activate α7 nAChR and facilitate its pathogenesis, and blocking SLURP1-α7 nAChR interaction might represent a novel therapeutic strategy for E. coli K1 meningitis.
Collapse
Affiliation(s)
- Xiaolong He
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China.,Department of Infectious Disease, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-Sen University, Jiangmen, China
| | - Lei Wang
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China
| | - Liqun Liu
- Saban Research Institute, University of Southern California, Children's Hospital Los Angeles, Los Angeles, CA, United States.,Department of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Jie Gao
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China.,Department of Infectious Disease, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-Sen University, Jiangmen, China
| | - Beiguo Long
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China
| | - Feng Chi
- Saban Research Institute, University of Southern California, Children's Hospital Los Angeles, Los Angeles, CA, United States
| | - Tongtong Hu
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China
| | - Yu Wan
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China
| | - Zelong Gong
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China
| | - Li Li
- Saban Research Institute, University of Southern California, Children's Hospital Los Angeles, Los Angeles, CA, United States.,Kunming Key Laboratory of Children Infection and Immunity, Yunnan Institute of Pediatrics, Kunming Children's Hospital, Kunming, China
| | - Peilin Zhen
- Department of Infectious Disease, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-Sen University, Jiangmen, China
| | - Tiesong Zhang
- Kunming Key Laboratory of Children Infection and Immunity, Yunnan Institute of Pediatrics, Kunming Children's Hospital, Kunming, China
| | - Hong Cao
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China
| | - Sheng-He Huang
- Department of Microbiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China.,Saban Research Institute, University of Southern California, Children's Hospital Los Angeles, Los Angeles, CA, United States.,Kunming Key Laboratory of Children Infection and Immunity, Yunnan Institute of Pediatrics, Kunming Children's Hospital, Kunming, China
| |
Collapse
|
10
|
AlQasrawi D, Naser E, Naser SA. Nicotine Increases Macrophage Survival through α7nAChR/NF-κB Pathway in Mycobacterium avium paratuberculosis Infection. Microorganisms 2021; 9:microorganisms9051086. [PMID: 34070119 PMCID: PMC8158352 DOI: 10.3390/microorganisms9051086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/06/2021] [Accepted: 05/13/2021] [Indexed: 11/25/2022] Open
Abstract
Recently, we reported that nicotine plays a role in the failure of the macrophage in the clearance of Mycobacterium avium subspecies paratuberculosis (MAP) during infection in Crohn’s disease smokers. We also demonstrated that nicotine enhances macrophages cellular survival during MAP infection. Blocking α7 nicotinic acetylcholine receptor (α7nAChR) with the pharmacological antagonist—mecamylamine—subverted the anti-inflammatory effect of nicotine in macrophages. Yet, it is still unknown how α7nAChR is involved in the modulation of the macrophage response during MAP infection. Here, we studied the mechanistic role of nicotine-α7nAChR interaction in modulating NF-ĸB survival pathway, autophagy, and effect on cathelicidin production in MAP-infected macrophages using THP-1 cell lines. Our results showed that nicotine upregulated α7nAChR expression by 5-folds during MAP infection compared to controls. Bcl-2 expression was also significantly increased after nicotine exposure. Moreover, Nicotine inhibited autophagosome formation whereas infection with MAP in absence of nicotine has significantly increased LC-3b in macrophages. Nicotine also further upregulated NF-ĸB subunits expression including Rel-B and p100, and increased nuclear translocation of p52 protein. We also discovered that cathelicidin production was significantly suppressed in MAP-infected macrophages, treatment with nicotine showed no effect. Overall, the study provides new insight toward understanding the cellular role of nicotine through α7nAChR/NF-ĸB p100/p52 signaling pathway in inducing anti-apoptosis and macrophage survival during MAP infection in Crohn’s disease smokers.
Collapse
Affiliation(s)
- Dania AlQasrawi
- Division of Molecular Microbiology, Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32816, USA
| | - Ebraheem Naser
- College of Pharmacy, University of Florida, Gainesville, FL 32611, USA
| | - Saleh A Naser
- Division of Molecular Microbiology, Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32816, USA
| |
Collapse
|
11
|
Brief Report: Increased Cotinine Concentrations are Associated With Reduced Expression of Cathelicidin (LL-37) and NOD-2 in Alveolar Macrophages of PLWH Who Smoke. J Acquir Immune Defic Syndr 2021; 85:670-673. [PMID: 32852363 DOI: 10.1097/qai.0000000000002491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
There is a strong link between cigarette smoking and pulmonary complications among people living with HIV. However, the effects of smoking on the local lung immune environment in this population remain unclear. Bronchoalveolar lavage and saliva were collected from HIV-infected smokers involved in a prospective study investigating alveolar macrophage expression of host defense molecules. Salivary cotinine concentrations were inversely related to expression of the immune cell receptor nucleotide-binding oligomerization domain-2 and the cathelicidin antimicrobial peptide LL-37. The negative correlation between salivary cotinine and LL-37 was particularly strong. Our study provides insight into how nicotine may adversely affect lung innate immunity in HIV.
Collapse
|
12
|
Miramontes CV, Rodríguez-Carlos A, Marin-Luévano SP, Trejo Martínez LA, de Haro Acosta J, Enciso-Moreno JA, Rivas-Santiago B. Nicotine promotes the intracellular growth of Mycobacterium tuberculosis in epithelial cells. Tuberculosis (Edinb) 2020; 127:102026. [PMID: 33262029 DOI: 10.1016/j.tube.2020.102026] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 10/13/2020] [Accepted: 11/10/2020] [Indexed: 10/22/2022]
Abstract
Several epidemiological studies have identified the cigarette smoke as a risk factor for the infection and development of tuberculosis. Nicotine is considered the main immunomodulatory molecule of the cigarette. In the present study, we evaluated the effect of nicotine in the growth of M. tuberculosis. Lung epithelial cells and macrophages were infected with M. tuberculosis and/or treated with nicotine. The results show that nicotine increased the growth of M. tuberculosis mainly in type II pneumocytes (T2P) but not in airway basal epithelial cells nor macrophages. Further, it was observed that nicotine decreased the production of β-defensin-2, β-defensin-3, and the cathelicidin LL-37 in all the evaluated cells at 24 and 72 h post-infection. The modulation of the expression of antimicrobial peptides appears to be partially mediated by the nicotinic acetylcholine receptor α7 since the blockade of this receptor partially reverted the production of antimicrobial peptides. In summary, it was found that nicotine decreases the production of HBD-2, HBD-3, and LL-37 in T2P during the infection with M. tuberculosis promoting its intracellular growth.
Collapse
Affiliation(s)
- Claudia Valdez Miramontes
- Medical Research Unit-Zacatecas. Mexican Institute for Social Security- IMSS, Zacatecas, Mexico; Center for Research in Health Sciences and Biomedicine Autonomous University of San Luis Potosí, Mexico
| | - Adrián Rodríguez-Carlos
- Medical Research Unit-Zacatecas. Mexican Institute for Social Security- IMSS, Zacatecas, Mexico
| | - Sara P Marin-Luévano
- Medical Research Unit-Zacatecas. Mexican Institute for Social Security- IMSS, Zacatecas, Mexico
| | - Luis A Trejo Martínez
- Medical Research Unit-Zacatecas. Mexican Institute for Social Security- IMSS, Zacatecas, Mexico
| | - Jeny de Haro Acosta
- Medical Research Unit-Zacatecas. Mexican Institute for Social Security- IMSS, Zacatecas, Mexico
| | - José A Enciso-Moreno
- Medical Research Unit-Zacatecas. Mexican Institute for Social Security- IMSS, Zacatecas, Mexico
| | - Bruno Rivas-Santiago
- Medical Research Unit-Zacatecas. Mexican Institute for Social Security- IMSS, Zacatecas, Mexico.
| |
Collapse
|
13
|
Chan ED, Bai X. Further evidence that cigarette smoke and nicotine compromise host immunity against tuberculosis (invited editorial). Tuberculosis (Edinb) 2020; 127:102035. [PMID: 33317928 DOI: 10.1016/j.tube.2020.102035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 11/23/2020] [Indexed: 10/22/2022]
Affiliation(s)
- Edward D Chan
- Pulmonary Section, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, CO, USA; Department of Academic Affairs, National Jewish Health, Denver, CO, USA; Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
| | - Xiyuan Bai
- Pulmonary Section, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, CO, USA; Department of Academic Affairs, National Jewish Health, Denver, CO, USA; Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
| |
Collapse
|
14
|
Wolk K, Join-Lambert O, Sabat R. Aetiology and pathogenesis of hidradenitis suppurativa. Br J Dermatol 2020; 183:999-1010. [PMID: 33048349 DOI: 10.1111/bjd.19556] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/06/2020] [Indexed: 02/06/2023]
Abstract
Hidradenitis suppurativa (HS) is a chronic inflammatory disorder. Patients develop inflamed nodules and abscesses and, at later stages of disease, epithelialized tunnels and scars in skinfolds of axillary, inguinal, gluteal and perianal areas. Quality of life is affected due to severe pain, purulent secretion, restricted mobility and systemic involvement. Genetics and lifestyle factors including smoking and obesity contribute to the development of HS. These factors lead to microbiome alteration, subclinical inflammation around the terminal hair follicles, and infundibular hyperkeratosis, resulting in plugging and rupture of the follicles. Cell-damage-associated molecules and propagating bacteria trigger inflammation and lead to massive immune cell infiltration that clinically manifests as inflamed nodules and abscesses. The immune system plays a key role also in the progression and chronification of skin alterations. Innate proinflammatory cytokines (e.g. interleukin-1β and tumour necrosis factor-α), mediators of activated T helper (Th)1 and Th17 cells (e.g. interleukin-17 and interferon-γ), and effector mechanisms of neutrophilic granulocytes, macrophages and plasma cells are involved. Simultaneously, skin lesions contain anti-inflammatory mediators (e.g. interleukin-10) and show limited activity of Th22 and regulatory T cells. The inflammatory vicious circle finally results in pain, purulence, tissue destruction and scarring. Chronic inflammation in patients with HS is also frequently detected in organs other than the skin, as indicated by their comorbidities. All these aspects represent a challenge for the development of therapeutic approaches, which are urgently needed for this debilitating disease. This scholarly review focuses on the causes and pathogenetic mechanisms of HS and the potential therapeutic value of this knowledge.
Collapse
Affiliation(s)
- K Wolk
- Berlin-Brandenburg Centre for Regenerative Therapies, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - O Join-Lambert
- Groupe de Recherche sur l'Adaptation Microbienne (GRAM 2.0, EA 2656), Normandie University, UNICAEN, UNIROUEN, Caen, France.,Department of Microbiology, CHU de Caen Normandie, Caen, France
| | - R Sabat
- Interdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Psoriasis Research and Treatment Centre, Charité-Universitätsmedizin Berlin, Berlin, Germany
| |
Collapse
|
15
|
Deng J, Tan LH, Kohanski MA, Kennedy DW, Bosso JV, Adappa ND, Palmer JN, Shi J, Cohen NA. Solitary chemosensory cells are innervated by trigeminal nerve endings and autoregulated by cholinergic receptors. Int Forum Allergy Rhinol 2020; 11:877-884. [DOI: 10.1002/alr.22695] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 07/31/2020] [Accepted: 08/18/2020] [Indexed: 02/06/2023]
Affiliation(s)
- Jie Deng
- Otorhinolaryngology Hospital, The First Affiliated Hospital Sun Yat‐sen University Guangzhou China
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
| | - Li Hui Tan
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
| | - Michael A. Kohanski
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
| | - David W. Kennedy
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
| | - John V. Bosso
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
| | - Nithin D. Adappa
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
| | - James N. Palmer
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
| | - Jianbo Shi
- Otorhinolaryngology Hospital, The First Affiliated Hospital Sun Yat‐sen University Guangzhou China
| | - Noam A. Cohen
- Division of Rhinology, Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine University of Pennsylvania Philadelphia PA
- Corporal Michael J. Crescenz Veterans Administration Medical Center Philadelphia PA
- Monell Chemical Senses Center Philadelphia PA
| |
Collapse
|
16
|
Sung Kim H, Yosipovitch G. THE SKIN MICROBIOTA AND ITCH: Is There a Link? THE JOURNAL OF CLINICAL AND AESTHETIC DERMATOLOGY 2020; 13:S39-S46. [PMID: 33282109 PMCID: PMC7710288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Itch is an unpleasant sensation that emanates primarily from the skin. The chemical mediators that drive neuronal activity originate from a complex interaction between keratinocytes, inflammatory cells, nerve endings, and the skin microbiota, relaying itch signals to the brain. Stress also exacerbates itch via the skin-brain axis. Recently, the microbiota has surfaced as a major player to regulate this axis, notably during stress settings aroused by actual or perceived homeostatic challenge. The routes of communication between the microbiota and brain are slowly being unraveled and involve neurochemicals (i.e., acetylcholine, histamine, catecholamines, and corticotropin) that originate from the microbiota itself. By focusing on itch biology and by referring to the more established field of pain research, this review examines the possible means by which the skin microbiota contributes to itch.
Collapse
Affiliation(s)
- Hei Sung Kim
- Dr. Kim is with the Department of Dermatology and Cutaneous Surgery at Miami Itch Center, Miller School of Medicine at University of Miami in Miami, Florida, the Department of Dermatology at Incheon St. Mary's Hospital, The Catholic University of Korea in Seoul, Korea, and the Department of Biomedicine and Health Sciences, at The Catholic University of Korea in Seoul, Korea
- Dr. Yosipovitch is with the Department of Dermatology and Cutaneous Surgery at Miami Itch Center, Miller School of Medicine at the University of Miami in Miami, Florida
| | - Gil Yosipovitch
- Dr. Kim is with the Department of Dermatology and Cutaneous Surgery at Miami Itch Center, Miller School of Medicine at University of Miami in Miami, Florida, the Department of Dermatology at Incheon St. Mary's Hospital, The Catholic University of Korea in Seoul, Korea, and the Department of Biomedicine and Health Sciences, at The Catholic University of Korea in Seoul, Korea
- Dr. Yosipovitch is with the Department of Dermatology and Cutaneous Surgery at Miami Itch Center, Miller School of Medicine at the University of Miami in Miami, Florida
| |
Collapse
|
17
|
Liu P, Guo L, Mao H, Gu Z. Serum proteomics analysis reveals the thermal fitness of crossbred dairy buffalo to chronic heat stress. J Therm Biol 2020; 89:102547. [PMID: 32364989 DOI: 10.1016/j.jtherbio.2020.102547] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 02/15/2020] [Accepted: 02/16/2020] [Indexed: 12/11/2022]
Abstract
Chronic heat stress (CHS) reduces the production efficiency of the buffalo dairy industry. Relatively low-abundance proteins with particular functions in biological processes are changed by CHS. The present study aimed to quantify the differences in low-abundance proteins of crossbred dairy buffaloes under CHS and thermal-neutral (TN) conditions. With label-free quantification, 344 low-abundance proteins were identified in serum. Of these, 17 differentially expressed low-abundance proteins with known functions were detected, and six of the differentially expressed proteins related to heat stress were validated with parallel reaction monitoring. Lipase (LPL), glutathione peroxidase 3 (GPX3), cathelicidin-2 (CATHL2), ceruloplasmin (CP), and hemoglobin subunit alpha 1 (HBA1) cooperatively played roles in the thermal fitness of dairy buffalo by decreasing heat production and increasing blood oxygen delivery. Also, dairy buffaloes may adapt to CHS and hypoxia with high levels of RBCs, HBA1 and CP to increase blood oxygen delivery capacity.
Collapse
Affiliation(s)
- Ping Liu
- Yunnan Agricultural University, Black dargon pool, China.
| | - Lulu Guo
- Yunnan Agricultural University, Black dargon pool, China.
| | - Huaming Mao
- Yunnan Agricultural University, Black dargon pool, China.
| | - Zhaobing Gu
- Yunnan Agricultural University, Black dargon pool, China.
| |
Collapse
|
18
|
AlQasrawi D, Abdelli LS, Naser SA. Mystery Solved: Why Smoke Extract Worsens Disease in Smokers with Crohn's Disease and Not Ulcerative Colitis? Gut MAP! Microorganisms 2020; 8:microorganisms8050666. [PMID: 32370298 PMCID: PMC7284734 DOI: 10.3390/microorganisms8050666] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 04/27/2020] [Accepted: 04/29/2020] [Indexed: 12/16/2022] Open
Abstract
Cigarette smoke (CS) exacerbates symptoms in Crohn’s disease (CD) patients while protecting those with ulcerative colitis (UC). CD has been associated with immuno-dysregulation, mucosal dysfunction, and infection. Among the CD-debated pathogens are Mycobacterium avium subsp. paratuberculosis (MAP), adherent invasive Escherichia coli (AIEC), and Klebsiella pneumoniae. The mechanism of how CS modulates nicotinic acetylcholine receptor-α7 (α7nAChR) and elicits inflammatory response in CD-like macrophages is unknown. Here, we investigated the effect of CS/nicotine on macrophages infected with CD-associated pathogens. We measured apoptosis, bacterial viability, macrophage polarization, and gene expression/cytokine levels involved in macrophage response to nicotine/CS extracts from Havana-Leave extract (HLE-nicotine rich) and germplasm line of Maryland tobacco (LAMD-nicotine less). Nicotine (4 µg/mL) and HLE extracts (0.18%) significantly favored anti-inflammatory response in macrophages (increased CD-206 (M2) and IL-10, and decreased M1/M2 ratio; p < 0.05). While macrophages infected with MAP or treated with LPS promoted pro-inflammatory response. Further treatment of these macrophages with nicotine or HLE extracts caused higher inflammatory response (increased iNOS (M1), TNF-α, IL-6, and M1/M2 ratio, p < 0.05), increased MAP burden, and decreased apoptosis. Pre-conditioning macrophages with nicotine ahead of infection resulted in lower pro-inflammatory response. Blocking α7nAChR with an antagonist voided the effect of nicotine on macrophages. Overall, the study provides an insight toward understanding the contradictory effect of nicotine on Inflammatory Bowel Disease patients and about the mechanistic role of α7nAChR in modulation of macrophages in tobacco smokers.
Collapse
Affiliation(s)
| | | | - Saleh A. Naser
- Correspondence: ; Tel.: +1-407-823-0955; Fax: +1-407-823-0956
| |
Collapse
|
19
|
The Skin Microbiota and Itch: Is There a Link? J Clin Med 2020; 9:jcm9041190. [PMID: 32331207 PMCID: PMC7230651 DOI: 10.3390/jcm9041190] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 04/18/2020] [Accepted: 04/20/2020] [Indexed: 02/07/2023] Open
Abstract
Itch is an unpleasant sensation that emanates primarily from the skin. The chemical mediators that drive neuronal activity originate from a complex interaction between keratinocytes, inflammatory cells, nerve endings and the skin microbiota, relaying itch signals to the brain. Stress also exacerbates itch via the skin–brain axis. Recently, the microbiota has surfaced as a major player to regulate this axis, notably during stress settings aroused by actual or perceived homeostatic challenge. The routes of communication between the microbiota and brain are slowly being unraveled and involve neurochemicals (i.e., acetylcholine, histamine, catecholamines, corticotropin) that originate from the microbiota itself. By focusing on itch biology and by referring to the more established field of pain research, this review examines the possible means by which the skin microbiota contributes to itch.
Collapse
|
20
|
Abstract
Hidradenitis suppurativa (HS; also designated as acne inversa) is a chronic inflammatory disorder, which affects the intertriginous skin and is associated with numerous systemic comorbidities. The estimated prevalence of HS is ~1% in most studied countries. Typically starting in early adulthood, cutaneous inflamed nodules, abscesses and pus-discharging tunnels develop in axillary, inguinal, gluteal and perianal body sites. The comorbidities of HS include metabolic and cardiovascular disorders, which contribute to reduced life expectancy. A genetic predisposition, smoking, obesity and hormonal factors are established aetiological factors for HS. Cutaneous changes seem to start around hair follicles and involve activation of cells of the innate and adaptive immune systems, with pivotal roles for pro-inflammatory cytokines such as tumour necrosis factor, IL-1β and IL-17. The unrestricted and chronic immune response eventually leads to severe pain, pus discharge, irreversible tissue destruction and scar development. HS has profound negative effects on patients' quality of life, which often culminate in social withdrawal, unemployment, depression and suicidal thoughts. The therapeutic options for HS comprise antibiotic treatment, neutralization of tumour necrosis factor and surgical intervention together with lifestyle modification. Nevertheless, there is an enormous need for awareness of HS, understanding of its pathogenesis and novel treatments.
Collapse
|
21
|
Woodhams DC, Rollins-Smith LA, Reinert LK, Lam BA, Harris RN, Briggs CJ, Vredenburg VT, Patel BT, Caprioli RM, Chaurand P, Hunziker P, Bigler L. Probiotics Modulate a Novel Amphibian Skin Defense Peptide That Is Antifungal and Facilitates Growth of Antifungal Bacteria. MICROBIAL ECOLOGY 2020; 79:192-202. [PMID: 31093727 DOI: 10.1007/s00248-019-01385-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 04/25/2019] [Indexed: 06/09/2023]
Abstract
Probiotics can ameliorate diseases of humans and wildlife, but the mechanisms remain unclear. Host responses to interventions that change their microbiota are largely uncharacterized. We applied a consortium of four natural antifungal bacteria to the skin of endangered Sierra Nevada yellow-legged frogs, Rana sierrae, before experimental exposure to the pathogenic fungus Batrachochytrium dendrobatidis (Bd). The probiotic microbes did not persist, nor did they protect hosts, and skin peptide sampling indicated immune modulation. We characterized a novel skin defense peptide brevinin-1Ma (FLPILAGLAANLVPKLICSITKKC) that was downregulated by the probiotic treatment. Brevinin-1Ma was tested against a range of amphibian skin cultures and found to inhibit growth of fungal pathogens Bd and B. salamandrivorans, but enhanced the growth of probiotic bacteria including Janthinobacterium lividum, Chryseobacterium ureilyticum, Serratia grimesii, and Pseudomonas sp. While commonly thought of as antimicrobial peptides, here brevinin-1Ma showed promicrobial function, facilitating microbial growth. Thus, skin exposure to probiotic bacterial cultures induced a shift in skin defense peptide profiles that appeared to act as an immune response functioning to regulate the microbiome. In addition to direct microbial antagonism, probiotic-host interactions may be a critical mechanism affecting disease resistance.
Collapse
Affiliation(s)
- Douglas C Woodhams
- Department of Biology, University of Massachusetts Boston, Boston, MA, 02125, USA.
| | - Louise A Rollins-Smith
- Departments of Pathology, Microbiology and Immunology and Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232, USA
- Department of Biological Science, Vanderbilt University School of Medicine, Nashville, TN, 37235, USA
| | - Laura K Reinert
- Departments of Pathology, Microbiology and Immunology and Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232, USA
| | - Briana A Lam
- Department of Biology, James Madison University, Harrisonburg, VA, 22807, USA
| | - Reid N Harris
- Department of Biology, James Madison University, Harrisonburg, VA, 22807, USA
| | - Cheryl J Briggs
- Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA, 93106-9610, USA
| | - Vance T Vredenburg
- Department of Biology, San Francisco State University, San Francisco, CA, 94132-1722, USA
| | - Bhumi T Patel
- Department of Biology, University of Massachusetts Boston, Boston, MA, 02125, USA
| | - Richard M Caprioli
- Mass Spectrometry Research Center and Department of Biochemistry, Vanderbilt University, Nashville, TN, 37232-8575, USA
| | - Pierre Chaurand
- Department of Chemistry, Université de Montréal, Montreal, QC, H3T 1J4, Canada
| | - Peter Hunziker
- Functional Genomics Center Zurich, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Laurent Bigler
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| |
Collapse
|
22
|
Yu Y, Yang W, Li Y, Cong Y. Enteroendocrine Cells: Sensing Gut Microbiota and Regulating Inflammatory Bowel Diseases. Inflamm Bowel Dis 2020; 26:11-20. [PMID: 31560044 PMCID: PMC7539793 DOI: 10.1093/ibd/izz217] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Indexed: 12/12/2022]
Abstract
Host sensing in the gut microbiota has been crucial in the regulation of intestinal homeostasis. Although inflammatory bowel diseases (IBDs), multifactorial chronic inflammatory conditions of the gastrointestinal tract, have been associated with intestinal dysbiosis, the detailed interactions between host and gut microbiota are still not completely understood. Enteroendocrine cells (EECs) represent 1% of the intestinal epithelium. Accumulating evidence indicates that EECs are key sensors of gut microbiota and/or microbial metabolites. They can secrete cytokines and peptide hormones in response to microbiota, either in traditional endocrine regulation or by paracrine impact on proximal tissues and/or cells or via afferent nerve fibers. Enteroendocrine cells also play crucial roles in mucosal immunity, gut barrier function, visceral hyperalgesia, and gastrointestinal (GI) motility, thereby regulating several GI diseases, including IBD. In this review, we will focus on EECs in sensing microbiota, correlating enteroendocrine perturbations with IBD, and the underlying mechanisms.
Collapse
Affiliation(s)
- Yanbo Yu
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, P.R. China,Department of Microbiology and Immunology and Branch, Galveston, Texas, USA
| | - Wenjing Yang
- Department of Microbiology and Immunology and Branch, Galveston, Texas, USA
| | - Yanqing Li
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, P.R. China
| | - Yingzi Cong
- Department of Microbiology and Immunology and Branch, Galveston, Texas, USA,Department of Pathology, University of Texas Medical Branch, Galveston, Texas, USA,Address correspondence to: Yingzi Cong, PhD, Department of Microbiology and Immunology, University of Texas Medical Branch, 4.142C Medical Research Building, 301 University Blvd, Galveston, TX 77555-1019 ()
| |
Collapse
|
23
|
[Influence of nutrition, common autoimmune diseases and smoking on the incidence of foot mycoses]. Hautarzt 2019; 70:581-593. [PMID: 31172201 DOI: 10.1007/s00105-019-4441-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND Foot mycoses, including onychomycoses, are worldwide infectious diseases. As part of a regional survey using randomly selected residents of in Mecklenburg-Western Pomerania, we investigated the impact of dietary habits, the presence of most frequent autoimmune diseases and current smoking on fungal skin infections in order to reveal potential new risk factors to elucidate potential preventive interventions. OBJECTIVES The identification of potential new factors that influence the development of mycosis was performed in order to derive possible preventive measures. METHODS In the Study of Health in Pomerania (SHIP) in Mecklengburg-Western Pomerania, 2523 inhabitants were examined for mycotic lesions and asked about nutritional habits, the presence of atopic dermatitis, allergic rhinitis, psoriasis and smoking habits. RESULTS In all, 8% of probands were diagnosed with mycosis, 6.5% onychomycosis, 3.7% tinea pedis and 0.2% tinea corporis. Psoriasis, allergic rhinitis and atopic dermatitis and frequent consumption of cooked potatoes, oatmeal and corn flakes, cereals, pasta and rice were significantly associated with tinea pedis. Onychomycosis was positively associated with consumption of cooked potatoes. Cigarette consumption proved protective for tinea pedis and dermatophyte colonization. CONCLUSIONS The autoimmune disorders psoriasis and atopic dermatitis and allergic rhinitis seem to predispose to foot mycosis. Recalcitrant mycosis should raise the question of diets high in carbohydrates. Nicotine abuse seems to protect against skin mycosis and colonization.
Collapse
|
24
|
Liu C, Ouyang W, Xia J, Sun X, Zhao L, Xu F. Tumor Necrosis Factor-α Is Required for Mast Cell-Mediated Host Immunity Against Cutaneous Staphylococcus aureus Infection. J Infect Dis 2019; 218:64-74. [PMID: 29741644 DOI: 10.1093/infdis/jiy149] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Accepted: 04/17/2018] [Indexed: 01/09/2023] Open
Abstract
Background Mast cells (MCs) play a key role in immune process response to invading pathogens. Methods This study assessed the involvement of MCs in controlling Staphylococcus aureus infection in a cutaneous infection model of MC-deficient (KitW-sh/W-sh) mice. Results KitW-sh/W-sh mice developed significantly larger skin lesions after the cutaneous S. aureus challenge, when compared to wild-type (WT) mice, while MC dysfunction reduced the inflammation response to S. aureus. The levels of tumor necrosis factor (TNF)-α in skin tissues were significantly decreased in KitW-sh/W-sh mice upon infection. Moreover, the exogenous administration of MCs or recombinant TNF-α effectively restored the immune response against S. aureus in KitW-sh/W-sh mice via the recruitment of neutrophils to the infected site. These results indicate that the effects of MC deficiency are largely attributed to the decrease in production of TNF-α in cutaneous S. aureus infection. In addition, S. aureus-induced MC activation was dependent on the c-kit receptor-activated phosphoinositide 3-kinase (PI3K)/AKT/P65-nuclear factor (NF-κB) pathway, which was confirmed by treatment with Masitinib (a c-kit receptor inhibitor), Wortmannin (a PI3K inhibitor), and pyrrolidine dithiocarbamate (a NF-κB inhibitor), respectively. Conclusions The present study identifies the critical role of MCs in the host defense against S. aureus infection.
Collapse
Affiliation(s)
- Chao Liu
- Department of Infectious Diseases, Zhejiang University School of Medicine, Hangzhou, China
| | - Wei Ouyang
- Department of Infectious Diseases, Zhejiang University School of Medicine, Hangzhou, China
| | - Jingyan Xia
- Department of Radiation Oncology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaoru Sun
- Department of Infectious Diseases, Zhejiang University School of Medicine, Hangzhou, China
| | - Liying Zhao
- Department of Infectious Diseases, Zhejiang University School of Medicine, Hangzhou, China
| | - Feng Xu
- Department of Infectious Diseases, Zhejiang University School of Medicine, Hangzhou, China
| |
Collapse
|
25
|
New therapeutic targets for the prevention of infectious acute exacerbations of COPD: role of epithelial adhesion molecules and inflammatory pathways. Clin Sci (Lond) 2019; 133:1663-1703. [PMID: 31346069 DOI: 10.1042/cs20181009] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/27/2019] [Accepted: 06/28/2019] [Indexed: 12/15/2022]
Abstract
Chronic respiratory diseases are among the leading causes of mortality worldwide, with the major contributor, chronic obstructive pulmonary disease (COPD) accounting for approximately 3 million deaths annually. Frequent acute exacerbations (AEs) of COPD (AECOPD) drive clinical and functional decline in COPD and are associated with accelerated loss of lung function, increased mortality, decreased health-related quality of life and significant economic costs. Infections with a small subgroup of pathogens precipitate the majority of AEs and consequently constitute a significant comorbidity in COPD. However, current pharmacological interventions are ineffective in preventing infectious exacerbations and their treatment is compromised by the rapid development of antibiotic resistance. Thus, alternative preventative therapies need to be considered. Pathogen adherence to the pulmonary epithelium through host receptors is the prerequisite step for invasion and subsequent infection of surrounding structures. Thus, disruption of bacterial-host cell interactions with receptor antagonists or modulation of the ensuing inflammatory profile present attractive avenues for therapeutic development. This review explores key mediators of pathogen-host interactions that may offer new therapeutic targets with the potential to prevent viral/bacterial-mediated AECOPD. There are several conceptual and methodological hurdles hampering the development of new therapies that require further research and resolution.
Collapse
|
26
|
Shulepko MA, Kulbatskii DS, Bychkov ML, Lyukmanova EN. Human Nicotinic Acetylcholine Receptors: Part II. Non-Neuronal Cholinergic System. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2019. [DOI: 10.1134/s1068162019020122] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
27
|
Kishibe M, Griffin TM, Goslawski M, Sinacore J, Kristian SA, Radek KA. Topical nicotinic receptor activation improves wound bacterial infection outcomes and TLR2-mediated inflammation in diabetic mouse wounds. Wound Repair Regen 2018; 26:403-412. [PMID: 30264418 DOI: 10.1111/wrr.12674] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 09/14/2018] [Accepted: 09/18/2018] [Indexed: 01/13/2023]
Abstract
The cholinergic anti-inflammatory pathway can directly affect skin antibacterial responses via nicotinic acetylcholine receptors (nAChRs). In particular, α7 nAChR (CHRNA7) present in the epidermis modulates the host response to wounding and/or wound bacterial infection. While physiologic inflammation is required to initiate normal wound repair and can be triggered by Toll-like receptor (TLR) activation, chronic inflammation is frequently observed in diabetic wounds and can occur, in part, via excessive TLR2 activation or production. Consequently, this can delay physiologic wound healing responses and increase diabetic host susceptibility to bacterial infection. In this study, we demonstrate that topical nAChR activation diminishes bacterial survival and systemic dissemination in a mouse model of diabetic wound infection, while reducing wound TLR2 production, relative to control mice. We further determined that the antimicrobial peptide activity of diabetic mouse wounds is increased compared to control mice, but this effect is lost following topical nAChR activation. Finally, we observed that human diabetic wounds exhibit impaired α7 nAChR (CHRNA7) abundance and localization relative to human control (nondiabetic) skin. These findings suggest that topical administration of nAChR agonists may improve wound healing and infection outcomes in diabetic wounds by dampening TLR2-mediated inflammation and antimicrobial peptide response, and that the diabetic microenvironment may promote aberrant CHRNA7 production/activation that likely contributes to diabetic wound pathogenesis.
Collapse
Affiliation(s)
- Mari Kishibe
- Health Sciences Division, The Burn and Shock Trauma Research Institute, Loyola University Chicago, Maywood, Illinois.,Department of Surgery, Loyola University Chicago, Maywood, Illinois
| | - Tina M Griffin
- Health Sciences Division, The Burn and Shock Trauma Research Institute, Loyola University Chicago, Maywood, Illinois.,Department of Surgery, Loyola University Chicago, Maywood, Illinois
| | - Melissa Goslawski
- Infectious Disease and Immunology Research Institute, Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois
| | - James Sinacore
- Infectious Disease and Immunology Research Institute, Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois.,Department of Public Health Science, Loyola University Chicago, Maywood, Illinois
| | - Sascha A Kristian
- Health Sciences Division, The Burn and Shock Trauma Research Institute, Loyola University Chicago, Maywood, Illinois.,Department of Surgery, Loyola University Chicago, Maywood, Illinois
| | - Katherine A Radek
- Health Sciences Division, The Burn and Shock Trauma Research Institute, Loyola University Chicago, Maywood, Illinois.,Department of Surgery, Loyola University Chicago, Maywood, Illinois.,Infectious Disease and Immunology Research Institute, Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois.,Health Science Division, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois
| |
Collapse
|
28
|
Eissa N, Hussein H, Hendy GN, Bernstein CN, Ghia JE. Chromogranin-A and its derived peptides and their pharmacological effects during intestinal inflammation. Biochem Pharmacol 2018; 152:315-326. [PMID: 29656116 DOI: 10.1016/j.bcp.2018.04.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 04/10/2018] [Indexed: 02/07/2023]
Abstract
The gastrointestinal tract is the largest endocrine organ that produces a broad range of active peptides. Mucosal changes during inflammation alter the distribution and products of enteroendocrine cells (EECs) that play a role in immune activation and regulation of gut homeostasis by mediating communication between the nervous, endocrine and immune systems. Patients with inflammatory bowel disease (IBD) typically have altered expression of chromogranin (CHG)-A (CHGA), a major soluble protein secreted by EECs that functions as a pro-hormone. CHGA gives rise to several bioactive peptides that have direct or indirect effects on intestinal inflammation. In IBD, CHGA and its derived peptides are correlated with the disease activity. In this review we describe the potential immunomodulatory roles of CHGA and its derived peptides and their clinical relevance during the progression of intestinal inflammation. Targeting CHGA and its derived peptides could be of benefit for the diagnosis and clinical management of IBD patients.
Collapse
Affiliation(s)
- Nour Eissa
- Department of Immunology, College of Medicine, University of Manitoba, Winnipeg, MB, Canada; Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, MB, Canada; IBD Clinical and Research Centre, University of Manitoba, Winnipeg, MB, Canada
| | - Hayam Hussein
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Ohio State University, Columbus, OH, USA
| | - Geoffrey N Hendy
- Metabolic Disorders and Complications, McGill University Health Centre-Research Institute, Departments of Medicine, Physiology, and Human Genetics, McGill University, Montréal, QC, Canada
| | - Charles N Bernstein
- IBD Clinical and Research Centre, University of Manitoba, Winnipeg, MB, Canada; Section of Gastroenterology, Department of Internal Medicine, College of Medicine, University of Manitoba, Winnipeg, MB, Canada
| | - Jean-Eric Ghia
- Department of Immunology, College of Medicine, University of Manitoba, Winnipeg, MB, Canada; Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, MB, Canada; IBD Clinical and Research Centre, University of Manitoba, Winnipeg, MB, Canada; Section of Gastroenterology, Department of Internal Medicine, College of Medicine, University of Manitoba, Winnipeg, MB, Canada.
| |
Collapse
|
29
|
Burn Injury Alters Epidermal Cholinergic Mediators and Increases HMGB1 and Caspase 3 in Autologous Donor Skin and Burn Margin. Shock 2018; 47:175-183. [PMID: 27648692 DOI: 10.1097/shk.0000000000000752] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Burn wound healing complications, such as graft failure or infection, are a major source of morbidity and mortality in burn patients. The mechanisms by which local burn injury alters epidermal barrier function in autologous donor skin and surrounding burn margin are largely undefined. We hypothesized that defects in the epidermal cholinergic system may impair epidermal barrier function and innate immune responses. The objective was to identify alterations in the epidermal cholinergic pathway, and their downstream targets, associated with inflammation and cell death. We established that protein levels, but not gene expression, of the α7 nicotinic acetylcholine receptor (CHRNA7) were significantly reduced in both donor and burn margin skin. Furthermore, the gene and protein levels of an endogenous allosteric modulator of CHRNA7, secreted mammalian Ly-6/ urokinase-type plasminogen activator receptor-related protein-1, and acetylcholine were significantly elevated in donor and burn margin skin. As downstream proteins of inflammatory and cell death targets of nAChR activation, we found significant elevations in epidermal High Mobility Group Box Protein 1 and caspase 3 in donor and burn margin skin. Lastly, we employed a novel in vitro keratinocyte burn model to establish that burn injury influences the gene expression of these cholinergic mediators and their downstream targets. These results indicate that defects in cholinergic mediators and inflammatory/apoptotic molecules in donor and burn margin skin may directly contribute to graft failure or infection in burn patients.
Collapse
|
30
|
Predictors of colonization with Staphylococcus species among patients scheduled for cardiac and orthopedic interventions at tertiary care hospitals in north-eastern Germany-a prevalence screening study. Eur J Clin Microbiol Infect Dis 2017; 37:633-641. [PMID: 29270860 DOI: 10.1007/s10096-017-3154-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 11/28/2017] [Indexed: 02/08/2023]
Abstract
As methicillin-resistant Staphylococcus aureus (MRSA) colonization and infection in humans are a global challenge. In Mecklenburg and Western Pomerania (Germany) 1,517 patients who underwent surgical interventions were systematically screened for MRSA and MSSA colonization on the day of hospital admission and discharge. Demographic data, risk factors and colonization status of the (i) nose, (ii) throat, (iii) groin, and (iv) thorax or site of surgical intervention were determined. Of the 1,433 patients who were included for further evaluation, 331 (23.1%) were colonized with MSSA, while only 17 (1.2%) were MRSA carriers on the day of hospital admission. A combination of nose, throat and groin swabs returned a detection rate of 98.3% for MSSA/MRSA. Trauma patients had lower prevalence of MRSA/MSSA (OR 0.524, 95% CI: 0.37-0.75; p < 0.001) than patients with intended orthopedic interventions. Males showed significantly higher nasal S. aureus carrier rates than females (odds ratio (OR) = 1.478; 95% CI: 1.14-1.92; p = 0.003). Nasal S. aureus colonization was less frequent among male smokers as compared to non-smokers (chi2 = 16.801; phi = 0.154; p < 0.001). Age, gender and smoking had a significant influence on S. aureus colonization. Combining at least three different swabbing sites should be considered for standard screening procedure to determine S. aureus colonization at patients scheduled for cardiac or orthopedic interventions at tertiary care hospitals.
Collapse
|
31
|
Bai X, Stitzel JA, Bai A, Zambrano CA, Phillips M, Marrack P, Chan ED. Nicotine Impairs Macrophage Control of Mycobacterium tuberculosis. Am J Respir Cell Mol Biol 2017; 57:324-333. [PMID: 28398760 DOI: 10.1165/rcmb.2016-0270oc] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Pure nicotine impairs macrophage killing of Mycobacterium tuberculosis (MTB), but it is not known whether the nicotine component in cigarette smoke (CS) plays a role. Moreover, the mechanisms by which nicotine impairs macrophage immunity against MTB have not been explored. To neutralize the effects of nicotine in CS extract, we used a competitive inhibitor to the nicotinic acetylcholine receptor (nAChR)-mecamylamine-as well as macrophages derived from mice with genetic disruption of specific subunits of nAChR. We also determined whether nicotine impaired macrophage autophagy and whether nicotine-exposed T regulatory cells (Tregs) could subvert macrophage anti-MTB immunity. Mecamylamine reduced the CS extract increase in MTB burden by 43%. CS extract increase in MTB was also significantly attenuated in macrophages from mice with genetic disruption of either the α7, β2, or β4 subunit of nAChR. Nicotine inhibited autophagosome formation in MTB-infected THP-1 cells and primary murine alveolar macrophages, as well as increased the intracellular MTB burden. Nicotine increased migration of THP-1 cells, consistent with the increased number of macrophages found in the lungs of smokers. Nicotine induced Tregs to produce transforming growth factor-β. Naive mouse macrophages co-cultured with nicotine-exposed Tregs had significantly greater numbers of viable MTB recovered with increased IL-10 production and urea production, but no difference in secreted nitric oxide as compared with macrophages cocultured with unexposed Tregs. We conclude that nicotine in CS plays an important role in subverting macrophage control of MTB infection.
Collapse
Affiliation(s)
- Xiyuan Bai
- 1 Department of Medicine, Denver Veterans Affairs Medical Center, Denver, Colorado.,Departments of 2 Medicine.,3 Academic Affairs, and.,4 Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine, Aurora, Colorado; and
| | - Jerry A Stitzel
- 5 Department of Integrative Physiology, Institute for Behavioral Genetics, University of Colorado Boulder, Boulder, Colorado
| | - An Bai
- 1 Department of Medicine, Denver Veterans Affairs Medical Center, Denver, Colorado.,Departments of 2 Medicine.,3 Academic Affairs, and
| | - Cristian A Zambrano
- 5 Department of Integrative Physiology, Institute for Behavioral Genetics, University of Colorado Boulder, Boulder, Colorado
| | | | - Philippa Marrack
- 6 Immunology, and.,7 Howard Hughes Medical Institute, National Jewish Health, Denver, Colorado
| | - Edward D Chan
- 1 Department of Medicine, Denver Veterans Affairs Medical Center, Denver, Colorado.,Departments of 2 Medicine.,3 Academic Affairs, and.,4 Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine, Aurora, Colorado; and
| |
Collapse
|
32
|
Cutaneous Burn Injury Modulates Urinary Antimicrobial Peptide Responses and the Urinary Microbiome. Crit Care Med 2017; 45:e543-e551. [PMID: 28333758 DOI: 10.1097/ccm.0000000000002304] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVES Characterization of urinary bacterial microbiome and antimicrobial peptides after burn injury to identify potential mechanisms leading to urinary tract infections and associated morbidities in burn patients. DESIGN Retrospective cohort study using human urine from control and burn subjects. SETTING University research laboratory. PATIENTS Burn patients. INTERVENTIONS None. MEASUREMENTS AND MAIN RESULTS Urine samples from catheterized burn patients were collected hourly for up to 40 hours. Control urine was collected from "healthy" volunteers. The urinary bacterial microbiome and antimicrobial peptide levels and activity were compared with patient outcomes. We observed a significant increase in urinary microbial diversity in burn patients versus controls, which positively correlated with a larger percent burn and with the development of urinary tract infection and sepsis postadmission, regardless of age or gender. Urinary psoriasin and β-defensin antimicrobial peptide levels were significantly reduced in burn patients at 1 and 40 hours postadmission. We observed a shift in antimicrobial peptide hydrophobicity and activity between control and burn patients when urinary fractions were tested against Escherichia coli and Enterococcus faecalis urinary tract infection isolates. Furthermore, the antimicrobial peptide activity in burn patients was more effective against E. coli than E. faecalis. Urinary tract infection-positive burn patients with altered urinary antimicrobial peptide activity developed either an E. faecalis or Pseudomonas aeruginosa urinary tract infection, suggesting a role for urinary antimicrobial peptides in susceptibility to select uropathogens. CONCLUSIONS Our data reveal potential links for urinary tract infection development and several morbidities in burn patients through alterations in the urinary microbiome and antimicrobial peptides. Overall, this study supports the concept that early assessment of urinary antimicrobial peptide responses and the bacterial microbiome may be used to predict susceptibility to urinary tract infections and sepsis in burn patients.
Collapse
|
33
|
Troger J, Theurl M, Kirchmair R, Pasqua T, Tota B, Angelone T, Cerra MC, Nowosielski Y, Mätzler R, Troger J, Gayen JR, Trudeau V, Corti A, Helle KB. Granin-derived peptides. Prog Neurobiol 2017; 154:37-61. [PMID: 28442394 DOI: 10.1016/j.pneurobio.2017.04.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 04/10/2017] [Accepted: 04/16/2017] [Indexed: 12/14/2022]
Abstract
The granin family comprises altogether 7 different proteins originating from the diffuse neuroendocrine system and elements of the central and peripheral nervous systems. The family is dominated by three uniquely acidic members, namely chromogranin A (CgA), chromogranin B (CgB) and secretogranin II (SgII). Since the late 1980s it has become evident that these proteins are proteolytically processed, intragranularly and/or extracellularly into a range of biologically active peptides; a number of them with regulatory properties of physiological and/or pathophysiological significance. The aim of this comprehensive overview is to provide an up-to-date insight into the distribution and properties of the well established granin-derived peptides and their putative roles in homeostatic regulations. Hence, focus is directed to peptides derived from the three main granins, e.g. to the chromogranin A derived vasostatins, betagranins, pancreastatin and catestatins, the chromogranin B-derived secretolytin and the secretogranin II-derived secretoneurin (SN). In addition, the distribution and properties of the chromogranin A-derived peptides prochromacin, chromofungin, WE14, parastatin, GE-25 and serpinins, the CgB-peptide PE-11 and the SgII-peptides EM66 and manserin will also be commented on. Finally, the opposing effects of the CgA-derived vasostatin-I and catestatin and the SgII-derived peptide SN on the integrity of the vasculature, myocardial contractility, angiogenesis in wound healing, inflammatory conditions and tumors will be discussed.
Collapse
Affiliation(s)
- Josef Troger
- Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria.
| | - Markus Theurl
- Department of Internal Medicine, Medical University of Innsbruck, Innsbruck, Austria
| | - Rudolf Kirchmair
- Department of Internal Medicine, Medical University of Innsbruck, Innsbruck, Austria
| | - Teresa Pasqua
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende, Italy
| | - Bruno Tota
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende, Italy
| | - Tommaso Angelone
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende, Italy
| | - Maria C Cerra
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende, Italy
| | - Yvonne Nowosielski
- Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria
| | - Raphaela Mätzler
- Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria
| | - Jasmin Troger
- Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria
| | | | - Vance Trudeau
- Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
| | - Angelo Corti
- Vita-Salute San Raffaele University and Division of Experimental Oncology, San Raffaele Scientific Institute, Milan, Italy
| | - Karen B Helle
- Department of Biomedicine, University of Bergen, Norway
| |
Collapse
|
34
|
Impact of a chronic smoking habit on the osteo-immunoinflammatory mediators in the peri-implant fluid of clinically healthy dental implants. Arch Oral Biol 2016; 70:55-61. [PMID: 27328151 DOI: 10.1016/j.archoralbio.2016.05.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 12/08/2015] [Accepted: 05/20/2016] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the influence of chronic cigarette smoking on the profile of osteo-immunoinflammatory markers in the peri-implant crevicular fluid (PICF) from clinically healthy implants DESIGNS: Twenty-five smokers and 23 non-smoker subjects with a unitary screwed implant-supported crown in the molar or pre-molar region were enrolled in this study. The implants should have been in functioning for at least 12 months, and the peri-implant tissue should be clinically healthy [probing depth (PD)<4mm with no bleeding on probing (BoP) and no evidence of radiographic bone loss beyond bone remodeling]. The levels of interferon (INF)-γ, interleukin (IL)-4, IL-17, IL-1β, IL-10, IL-6, IL-8, tumor necrosis factor (TNF)-α, matrix metalloproteinase (MMP)-2, MMP-9, osteoprotegerin (OPG), soluble receptor activator of nuclear factor-κβ ligand (RANKL), osteocalcin (OC), osteopontin (OPN), transforming growth factor (TGF)-β, and cross-linked telopeptide of type I collagen (ICTP) in the PICF were quantified by a multiplexed bead immunoassay. RESULTS The smokers presented reduced levels of IL-4, IL-8, and TNF-α compared with the non-smoker individuals (p<0.05). In addition, although lower OPG levels were detected in the PICF of the smokers, the RANKL/OPG ratio did not show a significant difference (p>0.05). Moreover, higher ICTP concentrations and a higher TH1/TH2 ratio were observed in the PICF of the smoker patients (p<0.05). No differences between the groups were observed for the other markers evaluated (p>0.05). CONCLUSIONS Smoking habit modulate peri-implant cytokine profile, leading to reductions in IL-4, -8 TNF-α, and OPG levels and an increased ICTP and TH1/TH2 ratio in peri-implant crevicular fluid.
Collapse
|
35
|
Wang S, Peng L, Gai Z, Zhang L, Jong A, Cao H, Huang SH. Pathogenic Triad in Bacterial Meningitis: Pathogen Invasion, NF-κB Activation, and Leukocyte Transmigration that Occur at the Blood-Brain Barrier. Front Microbiol 2016; 7:148. [PMID: 26925035 PMCID: PMC4760054 DOI: 10.3389/fmicb.2016.00148] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 01/26/2016] [Indexed: 12/13/2022] Open
Abstract
Bacterial meningitis remains the leading cause of disabilities worldwide. This life-threatening disease has a high mortality rate despite the availability of antibiotics and improved critical care. The interactions between bacterial surface components and host defense systems that initiate bacterial meningitis have been studied in molecular and cellular detail over the past several decades. Bacterial meningitis commonly exhibits triad hallmark features (THFs): pathogen penetration, nuclear factor-kappaB (NF-κB) activation in coordination with type 1 interferon (IFN) signaling and leukocyte transmigration that occur at the blood-brain barrier (BBB), which consists mainly of brain microvascular endothelial cells (BMEC). This review outlines the progression of these early inter-correlated events contributing to the central nervous system (CNS) inflammation and injury during the pathogenesis of bacterial meningitis. A better understanding of these issues is not only imperative to elucidating the pathogenic mechanism of bacterial meningitis, but may also provide the in-depth insight into the development of novel therapeutic interventions against this disease.
Collapse
Affiliation(s)
- Shifu Wang
- Department of Children's Medical Laboratory Diagnosis Center, Qilu Children's Hospital of Shandong UniversityJinan, China; Children's Hospital Los Angeles, Keck School of Medicine, University of Southern CaliforniaLos Angeles, CA, USA
| | - Liang Peng
- Department of Clinical Laboratory, The Second Affiliated Hospital of Guangzhou Medical University Guangzhou, China
| | - Zhongtao Gai
- Department of Children's Medical Laboratory Diagnosis Center, Qilu Children's Hospital of Shandong University Jinan, China
| | - Lehai Zhang
- Department of Children's Medical Laboratory Diagnosis Center, Qilu Children's Hospital of Shandong University Jinan, China
| | - Ambrose Jong
- Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California Los Angeles, CA, USA
| | - Hong Cao
- Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Microbiology, School of Public Health and Tropical Medicine, Southern Medical University Guangzhou, China
| | - Sheng-He Huang
- Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California Los Angeles, CA, USA
| |
Collapse
|
36
|
Pereira MR, Leite PEC. The Involvement of Parasympathetic and Sympathetic Nerve in the Inflammatory Reflex. J Cell Physiol 2016; 231:1862-9. [DOI: 10.1002/jcp.25307] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 01/06/2016] [Indexed: 12/12/2022]
Affiliation(s)
| | - Paulo Emílio Corrêa Leite
- Laboratory of Bioengineering and in Vitro Toxicology; Directory of Metrology Applied to Life Sciences (LABET)-Dimav; National Institute of Metrology Quality and Technology-INMETRO; Duque de Caxias Rio de Janeiro Brazil
| |
Collapse
|
37
|
Dong J, Segawa R, Mizuno N, Hiratsuka M, Hirasawa N. Inhibitory effects of nicotine derived from cigarette smoke on thymic stromal lymphopoietin production in epidermal keratinocytes. Cell Immunol 2016; 302:19-25. [PMID: 26786889 DOI: 10.1016/j.cellimm.2016.01.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 12/31/2015] [Accepted: 01/01/2016] [Indexed: 01/02/2023]
Abstract
Thymic stromal lymphopoietin (TSLP) is regarded as the main factor responsible for the pathogenesis of atopic dermatitis (AD). Cigarette smoke is an aggravating factor for allergies, but has been reported to decrease the risk of AD. In the present study, we evaluated the role of nicotine, the main constituent in cigarette smoke extract, and its underlying mechanism of action in the regulation of TSLP expression. We found that nicotine significantly inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced TSLP expression in BALB/c mice and the mouse keratinocyte cell line PAM212. Nicotine inhibition of TSLP production was abolished by pretreatments with α7 nicotinic acetylcholine receptor (α7 nAChR) antagonists, AMP-activated protein kinase (AMPK) inhibitor, and phosphoinositide 3-kinase (PI3K) inhibitors. The same inhibitors abolished inhibition of nuclear factor-κB (NF-κB) activation by nicotine. These results suggest that nicotine inhibits the expression of TSLP by suppressing the activation of NF-κB through the α7 nAChR-PI3K-AMPK signaling pathway.
Collapse
Affiliation(s)
- Jiangxu Dong
- Laboratory of Pharmacotherapy of Life-Style Related Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Ryosuke Segawa
- Laboratory of Pharmacotherapy of Life-Style Related Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Natsumi Mizuno
- Laboratory of Pharmacotherapy of Life-Style Related Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Masahiro Hiratsuka
- Laboratory of Pharmacotherapy of Life-Style Related Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Noriyasu Hirasawa
- Laboratory of Pharmacotherapy of Life-Style Related Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.
| |
Collapse
|
38
|
Chernyavsky AI, Galitovskiy V, Grando SA. Molecular mechanisms of synergy of corneal muscarinic and nicotinic acetylcholine receptors in upregulation of E-cadherin expression. Int Immunopharmacol 2015; 29:15-20. [DOI: 10.1016/j.intimp.2015.04.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 03/31/2015] [Accepted: 04/17/2015] [Indexed: 12/20/2022]
|
39
|
|
40
|
Kishibe M, Griffin TM, Radek KA. Keratinocyte nicotinic acetylcholine receptor activation modulates early TLR2-mediated wound healing responses. Int Immunopharmacol 2015; 29:63-70. [PMID: 26071220 DOI: 10.1016/j.intimp.2015.05.047] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 05/18/2015] [Accepted: 05/29/2015] [Indexed: 12/23/2022]
Abstract
The cholinergic anti-inflammatory pathway spans several macro- and micro-environments to control inflammation via α7 nicotinic acetylcholine receptors (nAChRs). Physiologic inflammation is necessary for normal wound repair and is triggered, in part, via Toll-like receptors (TLRs). Here, we demonstrate that keratinocyte nAChR activation dampens TLR2-mediated migration and pro-inflammatory cytokine and antimicrobial peptide (AMP) production, which is restored by a α7-selective nAChR antagonist. The mechanism of this response occurs by blocking the NF-κB and Erk1/2 pathway during early and late wound healing. In a mouse model of Staphylococcus aureus wound infection, topical nAChR activation reduces wound AMP and TLR2 production to augment bacterial survival in wild-type mice. These findings suggest that aberrant α7 nAChR activation may impair normal wound healing responses, and that pharmacologic administration of topical nAChR antagonists may improve wound healing outcomes in wounds necessitating a more robust inflammatory response.
Collapse
Affiliation(s)
- Mari Kishibe
- The Burn and Shock Trauma Research Institute, Loyola University Chicago, Health Science Division, Maywood, IL, USA; Department of Surgery, Loyola University Chicago, Health Science Division, Maywood, IL, USA.
| | - Tina M Griffin
- The Burn and Shock Trauma Research Institute, Loyola University Chicago, Health Science Division, Maywood, IL, USA; Department of Surgery, Loyola University Chicago, Health Science Division, Maywood, IL, USA
| | - Katherine A Radek
- The Burn and Shock Trauma Research Institute, Loyola University Chicago, Health Science Division, Maywood, IL, USA; Department of Surgery, Loyola University Chicago, Health Science Division, Maywood, IL, USA; Infectious Disease and Immunology Research Institute in the Department of Microbiology and Immunology, Loyola University Chicago, Health Science Division, Maywood, IL, USA; Stritch School of Medicine, Loyola University Chicago, Health Science Division, Maywood, IL, USA
| |
Collapse
|
41
|
Leaf DE, Croy HE, Abrahams SJ, Raed A, Waikar SS. Cathelicidin antimicrobial protein, vitamin D, and risk of death in critically ill patients. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2015; 19:80. [PMID: 25887571 PMCID: PMC4357206 DOI: 10.1186/s13054-015-0812-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 02/13/2015] [Indexed: 12/28/2022]
Abstract
INTRODUCTION Decreased production of cathelicidin antimicrobial protein-18 (hCAP18) has been proposed to be a key mechanism linking decreased 25-hydroxyvitamin D (25D) levels with adverse outcomes among critically ill patients. However, few studies in humans have directly assessed plasma hCAP18 levels, and no study has evaluated the association between hCAP18 levels and adverse outcomes among critically ill patients. METHODS We performed a single-center, prospective cohort study among 121 critically ill patients admitted to intensive care units (ICUs) between 2008 and 2012. We measured plasma hCAP18, 25D, D-binding protein, and parathyroid hormone levels on ICU day 1. The primary endpoint was 90-day mortality. Secondary endpoints included hospital mortality, sepsis, acute kidney injury, duration of mechanical ventilation, and hospital length of stay. RESULTS ICU day 1 hCAP18 levels were directly correlated with 25D levels (Spearman's rho (rs) = 0.30, P = 0.001). In multivariate analyses adjusted for age and Acute Physiology and Chronic Health Evaluation II (APACHE II) score, patients with hCAP18 levels in the lowest compared to highest tertile on ICU day 1 had a 4.49 (1.08 to 18.67) greater odds of 90-day mortality, and also had greater odds of sepsis. ICU day 1 levels of other analytes were not associated with 90-day mortality. CONCLUSIONS Lower 25D levels on ICU day 1 are associated with lower hCAP18 levels, which are in turn associated with a greater risk of 90-day mortality. These findings provide a potential mechanistic basis for the frequently observed association between low 25D levels and poor outcomes in critically ill patients.
Collapse
Affiliation(s)
- David E Leaf
- Division of Renal Medicine, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.
| | - Heather E Croy
- Division of Renal Medicine, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.
| | - Sara J Abrahams
- Division of Renal Medicine, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.
| | - Anas Raed
- Division of Renal Medicine, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.
| | - Sushrut S Waikar
- Division of Renal Medicine, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.
| |
Collapse
|
42
|
Sussan TE, Gajghate S, Thimmulappa RK, Ma J, Kim JH, Sudini K, Consolini N, Cormier SA, Lomnicki S, Hasan F, Pekosz A, Biswal S. Exposure to electronic cigarettes impairs pulmonary anti-bacterial and anti-viral defenses in a mouse model. PLoS One 2015; 10:e0116861. [PMID: 25651083 PMCID: PMC4317176 DOI: 10.1371/journal.pone.0116861] [Citation(s) in RCA: 293] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 11/24/2014] [Indexed: 12/17/2022] Open
Abstract
Electronic cigarettes (E-cigs) have experienced sharp increases in popularity over the past five years due to many factors, including aggressive marketing, increased restrictions on conventional cigarettes, and a perception that E-cigs are healthy alternatives to cigarettes. Despite this perception, studies on health effects in humans are extremely limited and in vivo animal models have not been generated. Presently, we determined that E-cig vapor contains 7x1011 free radicals per puff. To determine whether E-cig exposure impacts pulmonary responses in mice, we developed an inhalation chamber for E-cig exposure. Mice that were exposed to E-cig vapor contained serum cotinine concentrations that are comparable to human E-cig users. E-cig exposure for 2 weeks produced a significant increase in oxidative stress and moderate macrophage-mediated inflammation. Since, COPD patients are susceptible to bacterial and viral infections, we tested effects of E-cigs on immune response. Mice that were exposed to E-cig vapor showed significantly impaired pulmonary bacterial clearance, compared to air-exposed mice, following an intranasal infection with Streptococcus pneumonia. This defective bacterial clearance was partially due to reduced phagocytosis by alveolar macrophages from E-cig exposed mice. In response to Influenza A virus infection, E-cig exposed mice displayed increased lung viral titers and enhanced virus-induced illness and mortality. In summary, this study reports a murine model of E-cig exposure and demonstrates that E-cig exposure elicits impaired pulmonary anti-microbial defenses. Hence, E-cig exposure as an alternative to cigarette smoking must be rigorously tested in users for their effects on immune response and susceptibility to bacterial and viral infections.
Collapse
Affiliation(s)
- Thomas E. Sussan
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
- * E-mail: (TES); (SB)
| | - Sachin Gajghate
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Rajesh K. Thimmulappa
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Jinfang Ma
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Jung-Hyun Kim
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Kuladeep Sudini
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Nicola Consolini
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Stephania A. Cormier
- Children′s Research Foundation Institute, University of Tennessee Health Science Center, 50 N. Dunlap, Memphis, Tennessee, United States of America
| | - Slawo Lomnicki
- Department of Environmental Sciences, Louisiana State University, Baton Rouge, Louisiana, United States of America
| | - Farhana Hasan
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana, United States of America
| | - Andrew Pekosz
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Shyam Biswal
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, Maryland, United States of America
- * E-mail: (TES); (SB)
| |
Collapse
|
43
|
Decreased plasma Chromogranin A361-372 (Catestatin) but not Chromogranin A17-38 (Vasostatin) in female dogs with bacterial uterine infection (pyometra). BMC Vet Res 2015; 11:14. [PMID: 25636335 PMCID: PMC4318355 DOI: 10.1186/s12917-015-0328-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 01/19/2015] [Indexed: 11/10/2022] Open
Abstract
Background Pyometra often induces systemic inflammatory response syndrome (SIRS) and early diagnosis is crucial for survival. Chromogranin A (CgA) is a neuroendocrine secretory protein that is co-released with catecholamines from the adrenal medulla and sympathetic nerve endings. A prognostic value of CgA has been found in humans that are critically ill or that have SIRS associated with infection. CgA has not yet been studied in dogs with bacterial infection. The aim of the study was to investigate CgA, measured by Chromogranin A361-372 (Catestatin; Cst) and Chromogranin A17-38 (Vasostatin; VS) in healthy dogs and in dogs with pyometra. Results Fifty dogs with pyometra, sampled prior to surgery and 64 healthy female dogs were included. In 19 pyometra cases, blood samples were also collected postoperatively. Concentrations of Cst and VS were measured in heparinised plasma and Cst also measured in EDTA plasma, by in-house radioimmunoassays. Student’s t-test and Wilcoxon two-sample test was used to test for differences between dog groups. Pre- and postoperative samples in dogs with pyometra were analysed by paired t-test. Pearson correlation was used to investigate associations of laboratory variables and hospitalization. P < 0.05 was considered significant. Concentrations of Cst were decreased in pyometra dogs (mean ± SE, 1.01 ± 0.05 nmol/L) compared to healthy dogs (mean ± SE, 1.70 ± 0.03 nmol/L) (p ≤ 0.0001). VS concentrations did not differ significantly between dogs with pyometra (0.40 ± 0.04 nmol/L) and healthy dogs (0.42 ± 0.03 nmol/L). Mean ± SE pre- and postoperative concentration of Cst (1.0 ± 0.04 nmol/L and 0.9 ± 0.2 nmol/L) and VS (0.36 ± 0.04 nmol/L and 0.36 ± 0.04 nmol/L) in dogs with pyometra did not differ significantly. Neither Cst nor VS concentrations were associated with duration of hospitalization and were not significantly different in the four dogs with pyometra that had prolonged (≥3 d) postoperative hospitalization. Conclusion Concentrations of Cst, but not VS, were decreased in pyometra. Cst and VS concentrations before and after ovariohysterectomy did not differ significantly and were not associated with duration of hospitalization. Further studies are warranted to evaluate a possible diagnostic or prognostic value for Cst and VS. Electronic supplementary material The online version of this article (doi:10.1186/s12917-015-0328-6) contains supplementary material, which is available to authorized users.
Collapse
|
44
|
Holmes CJ, Plichta JK, Gamelli RL, Radek KA. Dynamic Role of Host Stress Responses in Modulating the Cutaneous Microbiome: Implications for Wound Healing and Infection. Adv Wound Care (New Rochelle) 2015; 4:24-37. [PMID: 25566412 DOI: 10.1089/wound.2014.0546] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 06/01/2014] [Indexed: 01/06/2023] Open
Abstract
Significance: Humans are under constant bombardment by various stressors, including psychological anxiety and physiologic injury. Understanding how these stress responses influence the innate immune system and the skin microbiome remains elusive due to the complexity of the neuroimmune and stress response pathways. Both animal and human studies have provided critical information upon which to further elucidate the mechanisms by which mammalian stressors impair normal wound healing and/or promote chronic wound progression. Recent Advances: Development of high-throughput genomic and bioinformatic approaches has led to the discovery of both an epidermal and dermal microbiome with distinct characteristics. This technology is now being used to identify statistical correlations between specific microbiota profiles and clinical outcomes related to cutaneous wound healing and the response to pathogenic infection. Studies have also identified more prominent roles for typical skin commensal organisms in maintaining homeostasis and modulating inflammatory responses. Critical Issues: It is well-established that stress-induced factors, including catecholamines, acetylcholine, and glucocorticoids, increase the risk of impaired wound healing and susceptibility to infection. Despite the characterization of the cutaneous microbiome, little is known regarding the impact of these stress-induced molecules on the development and evolution of the cutaneous microbiome during wound healing. Future Directions: Further characterization of the mechanisms by which stress-induced molecules influence microbial proliferation and metabolism in wounds is necessary to identify altered microbial phenotypes that differentially influence host innate immune responses required for optimal healing. These mechanisms may yield beneficial as targets for manipulation of the microbiome to further benefit the host after cutaneous injury.
Collapse
Affiliation(s)
- Casey J. Holmes
- Department of Surgery, Loyola University Chicago, Health Sciences Division, Maywood, Illinois
- Burn Shock Trauma Research Institute, Loyola University Chicago, Health Sciences Division, Maywood, Illinois
| | - Jennifer K. Plichta
- Department of Surgery, Loyola University Chicago, Health Sciences Division, Maywood, Illinois
| | - Richard L. Gamelli
- Department of Surgery, Loyola University Chicago, Health Sciences Division, Maywood, Illinois
- Burn Shock Trauma Research Institute, Loyola University Chicago, Health Sciences Division, Maywood, Illinois
| | - Katherine A. Radek
- Department of Surgery, Loyola University Chicago, Health Sciences Division, Maywood, Illinois
- Burn Shock Trauma Research Institute, Loyola University Chicago, Health Sciences Division, Maywood, Illinois
| |
Collapse
|
45
|
Nienhouse V, Gao X, Dong Q, Nelson DE, Toh E, McKinley K, Schreckenberger P, Shibata N, Fok CS, Mueller ER, Brubaker L, Wolfe AJ, Radek KA. Interplay between bladder microbiota and urinary antimicrobial peptides: mechanisms for human urinary tract infection risk and symptom severity. PLoS One 2014; 9:e114185. [PMID: 25486068 PMCID: PMC4259481 DOI: 10.1371/journal.pone.0114185] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 11/05/2014] [Indexed: 12/11/2022] Open
Abstract
Resident bacterial communities (microbiota) and host antimicrobial peptides (AMPs) are both essential components of normal host innate immune responses that limit infection and pathogen induced inflammation. However, their interdependence has not been investigated in the context of urinary tract infection (UTI) susceptibility. Here, we explored the interrelationship between the urinary microbiota and host AMP responses as mechanisms for UTI risk. Using prospectively collected day of surgery (DOS) urine specimens from female pelvic floor surgery participants, we report that the relative abundance and/or frequency of specific urinary microbiota distinguished between participants who did or did not develop a post-operative UTI. Furthermore, UTI risk significantly correlated with both specific urinary microbiota and β-defensin AMP levels. Finally, urinary AMP hydrophobicity and protease activity were greater in participants who developed UTI, and correlated positively with both UTI risk and pelvic floor symptoms. These data demonstrate an interdependency between the urinary microbiota, AMP responses and symptoms, and identify a potential mechanism for UTI risk. Assessment of bacterial microbiota and host innate immune AMP responses in parallel may identify increased risk of UTI in certain populations.
Collapse
Affiliation(s)
- Vanessa Nienhouse
- The Burn and Shock Trauma Research Institute at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Microbiology and Immunology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Stritch School of Medicine at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Infectious Disease and Immunology Research Institute at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Xiang Gao
- Department of Biological Sciences, University of North Texas, Denton, Texas, United States of America
- Department of Computer Science and Engineering, University of North Texas, Denton, Texas, United States of America
| | - Qunfeng Dong
- Department of Biological Sciences, University of North Texas, Denton, Texas, United States of America
- Department of Computer Science and Engineering, University of North Texas, Denton, Texas, United States of America
| | - David E. Nelson
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Evelyn Toh
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Kathleen McKinley
- Department of Pathology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Paul Schreckenberger
- Stritch School of Medicine at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Infectious Disease and Immunology Research Institute at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Pathology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Noriko Shibata
- Department of Microbiology and Immunology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Infectious Disease and Immunology Research Institute at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Cynthia S. Fok
- Stritch School of Medicine at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Obstetrics/Gynecology, Division of Female Pelvic Medicine and Reconstructive Surgery at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Urology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Elizabeth R. Mueller
- Stritch School of Medicine at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Obstetrics/Gynecology, Division of Female Pelvic Medicine and Reconstructive Surgery at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Urology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Linda Brubaker
- Stritch School of Medicine at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Obstetrics/Gynecology, Division of Female Pelvic Medicine and Reconstructive Surgery at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Urology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Alan J. Wolfe
- Department of Microbiology and Immunology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Stritch School of Medicine at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Infectious Disease and Immunology Research Institute at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
| | - Katherine A. Radek
- The Burn and Shock Trauma Research Institute at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Microbiology and Immunology at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Stritch School of Medicine at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Infectious Disease and Immunology Research Institute at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- Department of Surgery at Loyola University Chicago, Health Sciences Division, Maywood, Illinois, United States of America
- * E-mail:
| |
Collapse
|
46
|
Leaf DE, Raed A, Donnino MW, Ginde AA, Waikar SS. Randomized controlled trial of calcitriol in severe sepsis. Am J Respir Crit Care Med 2014; 190:533-41. [PMID: 25029202 DOI: 10.1164/rccm.201405-0988oc] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Vitamin D and its metabolites have potent immunomodulatory effects in vitro, including up-regulation of cathelicidin, a critical antimicrobial protein. OBJECTIVES We investigated whether administration of 1,25-dihydroxyvitamin D (calcitriol) to critically ill patients with sepsis would have beneficial effects on markers of innate immunity, inflammation, and kidney injury. METHODS We performed a double-blind, randomized, placebo-controlled, physiologic study among 67 critically ill patients with severe sepsis or septic shock. Patients were randomized to receive a single dose of calcitriol (2 μg intravenously) versus placebo. The primary outcome was plasma cathelicidin protein levels assessed 24 hours after study drug administration. Secondary outcomes included leukocyte cathelicidin mRNA expression, plasma cytokine levels (IL-10, IL-6, tumor necrosis factor-α, IL-1β, and IL-2), and urinary kidney injury markers. MEASUREMENTS AND MAIN RESULTS Patients randomized to calcitriol (n = 36) versus placebo (n = 31) had similar plasma cathelicidin protein levels at 24 hours (P = 0.16). Calcitriol-treated patients had higher cathelicidin (P = 0.04) and IL-10 (P = 0.03) mRNA expression than placebo-treated patients 24 hours after study drug administration. Plasma cytokine levels (IL-10, IL-6, tumor necrosis factor-α, IL-1β, and IL-2) and urinary kidney injury markers were similar in calcitriol- versus placebo-treated patients (P > 0.05 for all comparisons). Calcitriol had no effect on clinical outcomes nor were any adverse effects observed. CONCLUSIONS Calcitriol administration did not increase plasma cathelicidin protein levels in critically ill patients with sepsis and had mixed effects on other immunomodulatory markers. Additional phase II trials investigating the dose and timing of calcitriol as a therapeutic agent in specific sepsis phenotypes may be warranted. Clinical trial registered with www.clinicaltrials.gov (NCT 01689441).
Collapse
Affiliation(s)
- David E Leaf
- 1 Division of Renal Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | | | | | | | | |
Collapse
|
47
|
Chan ED, Kinney WH, Honda JR, Bishwakarma R, Gangavelli A, Mya J, Bai X, Ordway DJ. Tobacco exposure and susceptibility to tuberculosis: is there a smoking gun? Tuberculosis (Edinb) 2014; 94:544-50. [PMID: 25305002 DOI: 10.1016/j.tube.2014.08.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Revised: 08/14/2014] [Accepted: 08/19/2014] [Indexed: 12/22/2022]
Abstract
In many regions of the world, there is a great overlap between the prevalence of cigarette smoke exposure and tuberculosis. Despite the large body of epidemiologic evidence that tobacco smoke exposure is associated with increased tuberculosis infection, active disease, severity of disease, and mortality from tuberculosis, these studies cannot distinguish whether the mechanism is principally through direct impairment of anti-tuberculosis immunity by cigarette smoke or due to potential confounders that increase risk for tuberculosis and are commonly associated with smoking--such as poverty, malnutrition, and crowded living conditions. While there are several in vivo murine and in vitro macrophage studies showing cigarette smoke impairs control of tuberculous infection, little is known of the molecular and cellular mechanisms by which this impairment occurs. Herein, we highlight the key findings of these studies. Additionally, we review key immune cells that play critical roles in host-defense or pathogenesis of tuberculosis and generate a hypothesis-driven discussion of the possible mechanisms by which cigarette smoke impairs or enhances their functions, respectively, ultimately resulting in compromised immunity against tuberculosis.
Collapse
Affiliation(s)
- Edward D Chan
- Department of Medicine, Denver Veterans Affairs Medical Center, 1055 Clermont St, Denver, CO 80220, USA; Departments of Medicine and Academic Affairs, D509, Neustadt Building, National Jewish Health, 1400 Jackson St, Denver, CO 80206, USA; Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Anschutz Medical Campus, Research 2, Box C-272, 9th Floor, 12700 East 19th Avenue, Aurora, CO 80045, USA.
| | - William H Kinney
- Departments of Medicine and Academic Affairs, D509, Neustadt Building, National Jewish Health, 1400 Jackson St, Denver, CO 80206, USA
| | - Jennifer R Honda
- Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Anschutz Medical Campus, Research 2, Box C-272, 9th Floor, 12700 East 19th Avenue, Aurora, CO 80045, USA
| | - Raju Bishwakarma
- Departments of Medicine and Academic Affairs, D509, Neustadt Building, National Jewish Health, 1400 Jackson St, Denver, CO 80206, USA
| | - Avani Gangavelli
- Departments of Medicine and Academic Affairs, D509, Neustadt Building, National Jewish Health, 1400 Jackson St, Denver, CO 80206, USA
| | - Jenny Mya
- Departments of Medicine and Academic Affairs, D509, Neustadt Building, National Jewish Health, 1400 Jackson St, Denver, CO 80206, USA
| | - Xiyuan Bai
- Departments of Medicine and Academic Affairs, D509, Neustadt Building, National Jewish Health, 1400 Jackson St, Denver, CO 80206, USA
| | - Diane J Ordway
- Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, 1682 Campus Delivery, Fort Collins, CO 80523, USA
| |
Collapse
|
48
|
Vagus nerve through α7 nAChR modulates lung infection and inflammation: models, cells, and signals. BIOMED RESEARCH INTERNATIONAL 2014; 2014:283525. [PMID: 25136575 PMCID: PMC4127262 DOI: 10.1155/2014/283525] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 05/08/2014] [Accepted: 05/15/2014] [Indexed: 12/27/2022]
Abstract
Cholinergic anti-inflammatory pathway (CAP) bridges immune and nervous systems and plays pleiotropic roles in modulating inflammation in animal models by targeting different immune, proinflammatory, epithelial, endothelial, stem, and progenitor cells and signaling pathways. Acute lung injury (ALI) is a devastating inflammatory disease. It is pathogenically heterogeneous and involves many cells and signaling pathways. Here, we emphasized the research regarding the modulatory effects of CAP on animal models, cell population, and signaling pathways that involved in the pathogenesis of ALI. By comparing the differential effects of CAP on systemic and pulmonary inflammation, we postulated that a pulmonary parasympathetic inflammatory reflex is formed to sense and respond to pathogens in the lung. Work targeting the formation and function of pulmonary parasympathetic inflammatory reflex would extend our understanding of how vagus nerve senses, recognizes, and fights with pathogens and inflammatory responses.
Collapse
|
49
|
Local burn injury impairs epithelial permeability and antimicrobial peptide barrier function in distal unburned skin. Crit Care Med 2014; 42:e420-31. [PMID: 24717471 DOI: 10.1097/ccm.0000000000000309] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVES Our objective was to characterize the mechanisms by which local burn injury compromises epithelial barrier function in burn margin, containing the elements necessary for healing of the burn site, and in distal unburned skin, which serves as potential donor tissue. DESIGN Experimental mouse scald burn injury. SETTING University Research Laboratory. SUBJECTS C57/Bl6 Male mice, 8-12 weeks old. INTERVENTIONS To confirm that dehydration was not contributing to our observed barrier defects, in some experiments mice received 1 mL of saline fluid immediately after burn, while a subgroup received an additional 0.5 mL at 4 hours and 1 mL at 24 hours following burn. We then assessed skin pH and transepidermal water loss every 12 hours on the burn wounds for 72 hours postburn. MEASUREMENTS AND MAIN RESULTS Burn margin exhibited increased epidermal barrier permeability indicated by higher pH, greater transepidermal water loss, and reduced lipid synthesis enzyme expression and structural protein production up to 96 hours postburn. By contrast, antimicrobial peptide production and protease activity were elevated in burn margin. Skin extracts from burn margin did not exhibit changes in the ability to inhibit bacterial growth. However, distal unburned skin from burned mice also demonstrated an impaired response to barrier disruption, indicated by elevated transepidermal water loss and reduced lipid synthesis enzyme and structural protein expression up to 96 hours postburn. Furthermore, skin extracts from distal unburned skin exhibited greater protease activity and a reduced capacity to inhibit bacterial growth of several skin pathogens. Finally, we established that antimicrobial peptide levels were also altered in the lung and bladder, which are common sites of secondary infection in burn-injured patients. CONCLUSIONS These findings reveal several undefined deficiencies in epithelial barrier function at the burn margin, potential donor skin sites, and organs susceptible to secondary infection. These functional and biochemical data provide novel insights into the mechanisms for graft failure and secondary infection after burn injury.
Collapse
|
50
|
Küng D, Bigler L, Davis LR, Gratwicke B, Griffith E, Woodhams DC. Stability of microbiota facilitated by host immune regulation: informing probiotic strategies to manage amphibian disease. PLoS One 2014; 9:e87101. [PMID: 24489847 PMCID: PMC3906108 DOI: 10.1371/journal.pone.0087101] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 12/19/2013] [Indexed: 01/16/2023] Open
Abstract
Microbial communities can augment host immune responses and probiotic therapies are under development to prevent or treat diseases of humans, crops, livestock, and wildlife including an emerging fungal disease of amphibians, chytridiomycosis. However, little is known about the stability of host-associated microbiota, or how the microbiota is structured by innate immune factors including antimicrobial peptides (AMPs) abundant in the skin secretions of many amphibians. Thus, conservation medicine including therapies targeting the skin will benefit from investigations of amphibian microbial ecology that provide a model for vertebrate host-symbiont interactions on mucosal surfaces. Here, we tested whether the cutaneous microbiota of Panamanian rocket frogs, Colostethus panamansis, was resistant to colonization or altered by treatment. Under semi-natural outdoor mesocosm conditions in Panama, we exposed frogs to one of three treatments including: (1) probiotic - the potentially beneficial bacterium Lysinibacillus fusiformis, (2) transplant – skin washes from the chytridiomycosis-resistant glass frog Espadarana prosoblepon, and (3) control – sterile water. Microbial assemblages were analyzed by a culture-independent T-RFLP analysis. We found that skin microbiota of C. panamansis was resistant to colonization and did not differ among treatments, but shifted through time in the mesocosms. We describe regulation of host AMPs that may function to maintain microbial community stability. Colonization resistance was metabolically costly and microbe-treated frogs lost 7–12% of body mass. The discovery of strong colonization resistance of skin microbiota suggests a well-regulated, rather than dynamic, host-symbiont relationship, and suggests that probiotic therapies aiming to enhance host immunity may require an approach that circumvents host mechanisms maintaining equilibrium in microbial communities.
Collapse
Affiliation(s)
- Denise Küng
- Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
| | - Laurent Bigler
- Institute of Organic Chemistry, University of Zurich, Zurich, Switzerland
| | - Leyla R. Davis
- Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
| | - Brian Gratwicke
- Center for Species Survival, Conservation and Science, National Zoological Park, Smithsonian Institution, Washington DC, United States of America
| | - Edgardo Griffith
- El Valle Amphibian Conservation Center, El Valle, República de Panamá
| | - Douglas C. Woodhams
- Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
- Smithsonian Tropical Research Institute, Balboa, Ancón, Panamá, República de Panamá
- * E-mail:
| |
Collapse
|