1
|
Raghuraman P, Ramireddy S, Raman G, Park S, Sudandiradoss C. Understanding a point mutation signature D54K in the caspase activation recruitment domain of NOD1 capitulating concerted immunity via atomistic simulation. J Biomol Struct Dyn 2025; 43:3766-3782. [PMID: 38415678 DOI: 10.1080/07391102.2024.2322618] [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: 07/27/2023] [Accepted: 12/11/2023] [Indexed: 02/29/2024]
Abstract
Point mutation D54K in the human N-terminal caspase recruitment domain (CARD) of nucleotide-binding oligomerization domain -1 (NOD1) abrogates an imperative downstream interaction with receptor-interacting protein kinase (RIPK2) that entails combating bacterial infections and inflammatory dysfunction. Here, we addressed the molecular details concerning conformational changes and interaction patterns (monomeric-dimeric states) of D54K by signature-based molecular dynamics simulation. Initially, the sequence analysis prioritized D54K as a pathogenic mutation, among other variants, based on a sequence signature. Since the mutation is highly conserved, we derived the distant ortholog to predict the sequence and structural similarity between native and mutant. This analysis showed the utility of 33 communal core residues associated with structural-functional preservation and variations, concurrently served to infer the cryptic hotspots Cys39, Glu53, Asp54, Glu56, Ile57, Leu74, and Lys78 determining the inter helical fold forming homodimers for putative receptor interaction. Subsequently, the atomistic simulations with free energy (MM/PB(GB)SA) calculations predicted structural alteration that takes place in the N-terminal mutant CARD where coils changed to helices (45 α3- L4-α4-L6- α683) in contrast to native (45T2-L4-α4-L6-T483). Likewise, the C-terminal helices 93T1-α7105 connected to the loops distorted compared to native 93α6-L7105 may result in conformational misfolding that promotes functional regulation and activation. These structural perturbations of D54K possibly destabilize the flexible adaptation of critical homotypic NOD1CARD-CARDRIPK2 interactions (α4Asp42-Arg488α5 and α6Phe86-Lys471α4) is consistent with earlier experimental reports. Altogether, our findings unveil the conformational plasticity of mutation-dependent immunomodulatory response and may aid in functional validation exploring clinical investigation on CARD-regulated immunotherapies to prevent systemic infection and inflammation.
Collapse
Affiliation(s)
- P Raghuraman
- Department of Biotechnology, School of Bioscience and Technology, Vellore Institute of Technology, Vellore, India
- Department of Life Sciences, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - Sriroopreddy Ramireddy
- Department of Biotechnology, School of Bioscience and Technology, Vellore Institute of Technology, Vellore, India
- Department of Genetics and Molecular Biology, School of Health Sciences, The Apollo University, Chittoor, India
| | - Gurusamy Raman
- Department of Life Sciences, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - SeonJoo Park
- Department of Life Sciences, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - C Sudandiradoss
- Department of Biotechnology, School of Bioscience and Technology, Vellore Institute of Technology, Vellore, India
| |
Collapse
|
2
|
Zang W, Geng F, Liu J, Wang Z, Zhang S, Li Y, Lu Z, Pan Y. Porphyromonas gingivalis potentiates stem-like properties of oral squamous cell carcinoma by modulating SCD1-dependent lipid synthesis via NOD1/KLF5 axis. Int J Oral Sci 2025; 17:15. [PMID: 40016182 PMCID: PMC11868650 DOI: 10.1038/s41368-024-00342-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 11/22/2024] [Accepted: 12/10/2024] [Indexed: 03/01/2025] Open
Abstract
Cancer stem cells (CSCs) are widely acknowledged as primary mediators to the initiation and progression of tumors. The association between microbial infection and cancer stemness has garnered considerable scholarly interest in recent years. Porphyromonas gingivalis (P. gingivalis) is increasingly considered to be closely related to the development of oral squamous cell carcinoma (OSCC). Nevertheless, the role of P. gingivalis in the stemness of OSCC cells remains uncertain. Herein, we showed that P. gingivalis was positively correlated with CSC markers expression in human OSCC specimens, promoted the stemness and tumorigenicity of OSCC cells, and enhanced tumor formation in nude mice. Mechanistically, P. gingivalis increased lipid synthesis in OSCC cells by upregulating the expression of stearoyl-CoA desaturase 1 (SCD1) expression, a key enzyme involved in lipid metabolism, which ultimately resulted in enhanced acquisition of stemness. Moreover, SCD1 suppression attenuated P. gingivalis-induced stemness of OSCC cells, including CSCs markers expression, sphere formation ability, chemoresistance, and tumor growth, in OSCC cells both in vitro and in vivo. Additionally, upregulation of SCD1 in P. gingivalis-infected OSCC cells was associated with the expression of KLF5, and that was modulated by P. gingivalis-activated NOD1 signaling. Taken together, these findings highlight the importance of SCD1-dependent lipid synthesis in P. gingivalis-induced stemness acquisition in OSCC cells, suggest that the NOD1/KLF5 axis may play a key role in regulating SCD1 expression and provide a molecular basis for targeting SCD1 as a new option for attenuating OSCC cells stemness.
Collapse
Affiliation(s)
- Wenli Zang
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China
| | - Fengxue Geng
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China
| | - Junchao Liu
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China
| | - Zengxu Wang
- Department of Oral Maxillofacial-Head and Neck Surgery, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China
| | - Shuwei Zhang
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China
| | - Yuchao Li
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China
| | - Ze Lu
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China
| | - Yaping Pan
- Department of Periodontics and Oral Biology, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Shenyang, China.
| |
Collapse
|
3
|
Chirivi M, Contreras GA. Endotoxin-induced alterations of adipose tissue function: a pathway to bovine metabolic stress. J Anim Sci Biotechnol 2024; 15:53. [PMID: 38581064 PMCID: PMC10998405 DOI: 10.1186/s40104-024-01013-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 02/14/2024] [Indexed: 04/07/2024] Open
Abstract
During the periparturient period, dairy cows exhibit negative energy balance due to limited appetite and increased energy requirements for lactogenesis. The delicate equilibrium between energy availability and expenditure puts cows in a state of metabolic stress characterized by excessive lipolysis in white adipose tissues (AT), increased production of reactive oxygen species, and immune cell dysfunction. Metabolic stress, especially in AT, increases the risk for metabolic and inflammatory diseases. Around parturition, cows are also susceptible to endotoxemia. Bacterial-derived toxins cause endotoxemia by promoting inflammatory processes and immune cell infiltration in different organs and systems while impacting metabolic function by altering lipolysis, mitochondrial activity, and insulin sensitivity. In dairy cows, endotoxins enter the bloodstream after overcoming the defense mechanisms of the epithelial barriers, particularly during common periparturient conditions such as mastitis, metritis, and pneumonia, or after abrupt changes in the gut microbiome. In the bovine AT, endotoxins induce a pro-inflammatory response and stimulate lipolysis in AT, leading to the release of free fatty acids into the bloodstream. When excessive and protracted, endotoxin-induced lipolysis can impair adipocyte's insulin signaling pathways and lipid synthesis. Endotoxin exposure can also induce oxidative stress in AT through the production of reactive oxygen species by inflammatory cells and other cellular components. This review provides insights into endotoxins' impact on AT function, highlighting the gaps in our knowledge of the mechanisms underlying AT dysfunction, its connection with periparturient cows' disease risk, and the need to develop effective interventions to prevent and treat endotoxemia-related inflammatory conditions in dairy cattle.
Collapse
Affiliation(s)
- Miguel Chirivi
- Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI, USA
| | - G Andres Contreras
- Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI, USA.
| |
Collapse
|
4
|
Bernardini I, Fabrello J, Vecchiato M, Ferraresso S, Babbucci M, Peruzza L, Rovere GD, Masiero L, Marin MG, Bargelloni L, Gambaro A, Patarnello T, Matozzo V, Milan M. Effects of environmental concentrations of the fragrance amyl salicylate on the mediterranean mussel Mytilus galloprovincialis. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 307:119502. [PMID: 35605833 DOI: 10.1016/j.envpol.2022.119502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 04/06/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
Amyl salicylate (AS) is a fragrance massively used as a personal care product and following the discharged in wastewaters may end up in the aquatic environment representing a potential threat for the ecosystem and living organisms. AS was recently detected in water of the Venice Lagoon, a vulnerable area continuously subjected to the income of anthropogenic chemicals. The lagoon is a relevant area for mollusc farming, including the Mediterranean mussels (Mytilus galloprovincialis) having an important economic and ecological role. Despite high levels of AS occurred in water of the Lagoon of Venice, no studies investigated the possible consequences of AS exposures on species inhabiting this ecosystem to date. For the first time, we applied a multidisciplinary approach to investigate the potential effects of the fragrance AS on Mediterranean mussels. To reach such a goal, bioaccumulation, cellular, biochemical, and molecular analyses (RNA-seq and microbiota characterization) were measured in mussels treated for 7 and 14 days with different AS Venice lagoon environmental levels (0.1 and 0.5 μg L-1). Despite chemical investigations suggested low AS bioaccumulation capability, cellular and molecular analyses highlighted the disruption of several key cellular processes after the prolonged exposures to the high AS concentration. Among them, potential immunotoxicity and changes in transcriptional regulation of pathways involved in energy metabolism, stress response, apoptosis and cell death regulations have been observed. Conversely, exposure to the low AS concentration demonstrated weak transcriptional changes and transient increased representation of opportunistic pathogens, as Arcobacter genus and Vibrio aestuarianus. Summarizing, this study provides the first overview on the effects of AS on one of the most widely farmed mollusk species.
Collapse
Affiliation(s)
- I Bernardini
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - J Fabrello
- Department of Biology, University of Padova, Via Bassi 58/B, 35131, Padova, Italy
| | - M Vecchiato
- Institute of Polar Sciences - National Research Council (ISP-CNR), Via Torino 155, 30172, Venezia-Mestre, Venice, Italy; Department of Environmental Sciences, Informatics and Statistics (DAIS), Ca' Foscari University of Venice, Via Torino 155, 30172, Venezia-Mestre, Venice, Italy
| | - S Ferraresso
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - M Babbucci
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - L Peruzza
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - G Dalla Rovere
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - L Masiero
- Department of Biology, University of Padova, Via Bassi 58/B, 35131, Padova, Italy
| | - M G Marin
- Department of Biology, University of Padova, Via Bassi 58/B, 35131, Padova, Italy
| | - L Bargelloni
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - A Gambaro
- Institute of Polar Sciences - National Research Council (ISP-CNR), Via Torino 155, 30172, Venezia-Mestre, Venice, Italy; Department of Environmental Sciences, Informatics and Statistics (DAIS), Ca' Foscari University of Venice, Via Torino 155, 30172, Venezia-Mestre, Venice, Italy
| | - T Patarnello
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - V Matozzo
- Department of Biology, University of Padova, Via Bassi 58/B, 35131, Padova, Italy.
| | - M Milan
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| |
Collapse
|
5
|
Zhang Y, Li N, Yuan G, Yao H, Zhang D, Li N, Zhang G, Sun Y, Wang W, Zeng J, Xu N, Liu M, Wu L. Upregulation of NOD1 and NOD2 contribute to cancer progression through the positive regulation of tumorigenicity and metastasis in human squamous cervical cancer. BMC Med 2022; 20:55. [PMID: 35130902 PMCID: PMC8822783 DOI: 10.1186/s12916-022-02248-w] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 01/10/2022] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Metastatic cervical squamous cell carcinoma (CSCC) has poor prognosis and is recalcitrant to the current treatment strategies, which warrants the necessity to identify novel prognostic markers and therapeutic targets. Given that CSCC is a virus-induced malignancy, we hypothesized that the pattern recognition receptors (PRRs) involved in the innate immune response likely play a critical role in tumor development. METHODS A bioinformatics analysis, qPCR, IHC, immunofluorescence, and WB were performed to determine the expression of NOD1/NOD2. The biological characteristics of overexpression NOD1 or NOD2 CSCC cells were compared to parental cells: proliferation, migration/invasion and cytokines secretion were examined in vitro through CCK8/colony formation/cell cycle profiling/cell counting, wound healing/transwell, and ELISA assays, respectively. The proliferative and metastatic capacity of overexpression NOD1 or NOD2 CSCC cells were also evaluated in vivo. FCM, mRNA and protein arrays, ELISA, and WB were used to identify the mechanisms involved, while novel pharmacological treatment were evaluated in vitro and in vivo. Quantitative variables between two groups were compared by Student's t test (normal distribution) or Mann-Whitney U test (non-normal distribution), and one-way or two-way ANOVA was used for comparing multiple groups. Pearson χ2 test or Fisher's exact test was used to compare qualitative variables. Survival curves were plotted by the Kaplan-Meier method and compared by the log-rank test. P values of < 0.05 were considered statistically significant. RESULTS NOD1 was highly expressed in CSCC with lymph-vascular space invasion (LVSI, P < 0.01) and lymph node metastasis (LM, P < 0.01) and related to worse overall survival (OS, P = 0.016). In vitro and in vivo functional assays revealed that the upregulation of NOD1 or NOD2 in CSCC cells promoted proliferation, invasion, and migration. Mechanistically, NOD1 and NOD2 exerted their oncogenic effects by activating NF-κb and ERK signaling pathways and enhancing IL-8 secretion. Inhibition of the IL-8 receptor partially abrogated the effects of NOD1/2 on CSCC cells. CONCLUSIONS NOD1/2-NF-κb/ERK and IL-8 axis may be involved in the progression of CSCC; the NOD1 significantly enhanced the progression of proliferation and metastasis, which leads to a poor prognosis. Anti-IL-8 was identified as a potential therapeutic target for patients with NOD1high tumor.
Collapse
Affiliation(s)
- Yuanyuan Zhang
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Ning Li
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Guangwen Yuan
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Hongwen Yao
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Die Zhang
- Laboratory of Cell and Molecular Biology & State Key Laboratory of Molecular Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Nan Li
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Gongyi Zhang
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Yangchun Sun
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Wenpeng Wang
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Jia Zeng
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Ningzhi Xu
- Laboratory of Cell and Molecular Biology & State Key Laboratory of Molecular Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China
| | - Mei Liu
- Laboratory of Cell and Molecular Biology & State Key Laboratory of Molecular Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China.
| | - Lingying Wu
- Department of Gynecologic Oncology, National Cancer Center/ National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Panjiayuan, Chaoyang District, 100021, Beijing, People's Republic of China.
| |
Collapse
|
6
|
Chen H, Ji H, Kong X, Lei P, Yang Q, Wu W, Jin L, Sun D. Bacterial Ghosts-Based Vaccine and Drug Delivery Systems. Pharmaceutics 2021; 13:1892. [PMID: 34834306 PMCID: PMC8622331 DOI: 10.3390/pharmaceutics13111892] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/26/2021] [Accepted: 11/02/2021] [Indexed: 12/13/2022] Open
Abstract
Bacterial ghosts (BGs) are empty bacterial envelopes of Gram-negative bacteria produced by controlled expressions of cloned gene E, forming a lysis tunnel structure within the envelope of the living bacteria. Globally, BGs have been used as vaccine delivery systems and vaccine adjuvants. There is an increasing interest in the development of novel delivery systems that are based on BGs for biomedical applications. Due to intact reservation of bacterial cell membranes, BGs have an inherent immunogenicity, which enables targeted drug delivery and controlled release. As carrier vehicles, BGs protect drugs from interference by external factors. In recent years, there has been an increasing interest in BG-based delivery systems against tumors, inflammation, and infection, among others. Herein, we reviewed the preparation methods for BGs, interactions between BGs and the host, and further highlighted research progress in BG development.
Collapse
Affiliation(s)
- Haojie Chen
- Institute of Life Sciences & Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Wenzhou University, Wenzhou 325035, China; (H.C.); (H.J.); (X.K.); (P.L.); (W.W.)
| | - Hao Ji
- Institute of Life Sciences & Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Wenzhou University, Wenzhou 325035, China; (H.C.); (H.J.); (X.K.); (P.L.); (W.W.)
| | - Xiangjun Kong
- Institute of Life Sciences & Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Wenzhou University, Wenzhou 325035, China; (H.C.); (H.J.); (X.K.); (P.L.); (W.W.)
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao 999078, China
| | - Pengyu Lei
- Institute of Life Sciences & Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Wenzhou University, Wenzhou 325035, China; (H.C.); (H.J.); (X.K.); (P.L.); (W.W.)
| | - Qinsi Yang
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325000, China;
| | - Wei Wu
- Institute of Life Sciences & Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Wenzhou University, Wenzhou 325035, China; (H.C.); (H.J.); (X.K.); (P.L.); (W.W.)
- Key Laboratory for Biorheological Science and Technology of Ministry of Education & State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China
| | - Libo Jin
- Institute of Life Sciences & Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Wenzhou University, Wenzhou 325035, China; (H.C.); (H.J.); (X.K.); (P.L.); (W.W.)
| | - Da Sun
- Institute of Life Sciences & Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Wenzhou University, Wenzhou 325035, China; (H.C.); (H.J.); (X.K.); (P.L.); (W.W.)
| |
Collapse
|
7
|
Chuphal B, Rai U, Kumar R, Roy B. Molecular and functional characterization of spotted snakehead NOD1 with an emphasis on structural insights into iE-DAP binding motifs employing advanced bioinformatic tools. J Biomol Struct Dyn 2021; 40:7483-7495. [PMID: 33710949 DOI: 10.1080/07391102.2021.1898472] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Nucleotide-binding and oligomerization domain (NOD)-like receptors (NLRs) are cytosolic receptors implicated in recognition of intracellular pathogen associated molecular patterns (PAMPs) and danger associated molecular patterns (DAMPs). Depending upon their effector binding domain (EBD) at the C-terminal, the NLRs are categorized into NLRA, NLRB, NLRC, NLRP and NLRX. NOD1 is a pivotal player in immune responses against bacterial and viral invasions and interacts with pathogens via C-terminal leucine rich repeat (LRR) domain. This study aims at characterizing NOD1 in an economically important teleost of the Indian subcontinent, spotted snakehead Channa punctata. The understanding of pathogen-receptor interaction in teleosts is still obscure. In light of this, combinatorial approach involving protein modeling, docking, MD simulation and binding free energy calculation were employed to identify key motifs involved in binding iE-DAP. In silico analysis revealed that NOD1 consists of 943 amino acids comprising of one caspase recruitment domain (CARD) at N-terminal, one central NACHT domain and nine leucine rich repeat (LRR) regions at C-terminal. Structural dynamics study showed that the C-terminal β-sheet LRR4-7 region is involved in iE-DAP binding. NOD1 was ubiquitously and constitutively expressed in all tissues studied. Differential expression profile of NOD1 induced by Aeromonas hydrophila infection was also investigated. Lymphoid organs and phagocytes of infected spotted snakehead showed significant downregulation of NOD1 expression. The current study thus gives an insight into structural and functional dynamics of NOD1 which might have future prospect for structure-based drug designing in teleosts.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Bhawna Chuphal
- Department of Zoology, University of Delhi, Delhi, India
| | - Umesh Rai
- Department of Zoology, University of Delhi, Delhi, India
| | - Rakesh Kumar
- School of Life Sciences, Jawaharlal Nehru University, Delhi, India
| | - Brototi Roy
- Maitreyi College, University of Delhi, New Delhi, India
| |
Collapse
|
8
|
Jiang K, Nie H, Li D, Yan X. New insights into the Manila clam and PAMPs interaction based on RNA-seq analysis of clam through in vitro challenges with LPS, PGN, and poly(I:C). BMC Genomics 2020; 21:531. [PMID: 32738896 PMCID: PMC7430831 DOI: 10.1186/s12864-020-06914-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 07/14/2020] [Indexed: 12/22/2022] Open
Abstract
Background Manila clam (Ruditapes philippinarum) is a worldwide commercially important marine bivalve species. In recent years, however, microbial diseases caused high economic losses and have received increasing attention. To understand the molecular basis of the immune response to pathogen-associated molecular patterns (PAMPs) in R. philippinarum, transcriptome libraries of clam hepatopancreas were constructed at 24 h post-injection with Lipopolysaccharide (LPS), peptidoglycan (PGN), and polyinosinic-polycytidylic acid (poly(I:C)) and phosphate-buffered saline (PBS) control by using RNA sequencing technology (RNA-seq). Results A total of 832, 839, and 188 differentially expressed genes (DEGs) were found in LPS, PGN, and poly(I:C) challenge group compared with PBS control, respectively. Several immune-related genes and pathways were activated in response to the different PAMPs, suggesting these genes and pathways might specifically participate in the immune response to pathogens. Besides, the analyses provided useful complementary data to compare different PAMPs challenges in vivo. Functional enrichment analysis of DEGs demonstrated that PAMPs responsive signal pathways were related to apoptosis, signal transduction, immune system, and signaling molecules and interaction. Several shared or specific DEGs response to different PAMPs were revealed in R. philippinarum, including pattern recognition receptors (PRRs), antimicrobial peptides (AMPs), interferon-induced proteins (IFI), and some other immune-related genes were found in the present work. Conclusions This is the first study employing high throughput transcriptomic sequencing to provide valuable genomic resources and investigate Manila clam response to different PAMPs through in vivo challenges with LPS, PGN, and poly(I:C). The results obtained here provide new insights to understanding the immune characteristics of R. philippinarum response to different PAMPs. This information is critical to elucidate the molecular basis of R. philippinarum response to different pathogens invasion, which potentially can be used to develop effective control strategies for different pathogens.
Collapse
Affiliation(s)
- Kunyin Jiang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China.,Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China
| | - Hongtao Nie
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China. .,Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China.
| | - Dongdong Li
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China.,Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China
| | - Xiwu Yan
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China.,Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China
| |
Collapse
|
9
|
Liu X, Ma H, Fei L, Jiang M, Xia M, Bai L, Pi X, Chen S, Yu L. HPV-mediated down-regulation of NOD1 inhibits apoptosis in cervical cancer. Infect Agent Cancer 2020; 15:6. [PMID: 32021648 PMCID: PMC6993450 DOI: 10.1186/s13027-020-0272-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Accepted: 01/12/2020] [Indexed: 12/12/2022] Open
Abstract
Cervical cancer is the fourth most common malignant tumor in women worldwide. The persistent infection of high-risk Human Papillomavirus (hrHPV) is considered to be the primary cause of this disease. As an innate immune receptor, the nucleotide-binding oligomerization domain protein-1 (NOD1) recognizes the pathogen-associated molecular pattern (PAMP), subsequently initiating immune responses. NOD1 is also involved in the apoptotic signaling pathway and mutates in many cancer cells. In the study, we revealed that NOD1 expression decreased during the progression of cervical intraepithelial neoplasia to cervical cancer and that HPV16 E6/E7 oncoproteins induced down-regulation of NOD1. Moreover, the activation of NOD1 promoted the apoptosis of HPV16-positive cervical cancer cells. The data indicated that the dysregulation of NOD1-mediated inflammation and apoptosis may contribute to cervical intraepithelial neoplasia progression and cervical cancer.
Collapse
Affiliation(s)
- Xubin Liu
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Hanyu Ma
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Lingyan Fei
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Mengjie Jiang
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Meng Xia
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Lihong Bai
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Xufang Pi
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Shangwu Chen
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| | - Li Yu
- Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 People's Republic of China
| |
Collapse
|
10
|
Jiang HY, Najmeh S, Martel G, MacFadden-Murphy E, Farias R, Savage P, Leone A, Roussel L, Cools-Lartigue J, Gowing S, Berube J, Giannias B, Bourdeau F, Chan CHF, Spicer JD, McClure R, Park M, Rousseau S, Ferri LE. Activation of the pattern recognition receptor NOD1 augments colon cancer metastasis. Protein Cell 2020; 11:187-201. [PMID: 31956962 PMCID: PMC7026222 DOI: 10.1007/s13238-019-00687-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 12/13/2019] [Indexed: 01/02/2023] Open
Abstract
While emerging data suggest nucleotide oligomerization domain receptor 1 (NOD1), a cytoplasmic pattern recognition receptor, may play an important and complementary role in the immune response to bacterial infection, its role in cancer metastasis is entirely unknown. Hence, we sought to determine the effects of NOD1 on metastasis. NOD1 expression in paired human primary colon cancer, human and murine colon cancer cells were determined using immunohistochemistry and immunoblotting (WB). Clinical significance of NOD1 was assessed using TCGA survival data. A series of in vitro and in vivo functional assays, including adhesion, migration, and metastasis, was conducted to assess the effect of NOD1. C12-iE-DAP, a highly selective NOD1 ligand derived from gram-negative bacteria, was used to activate NOD1. ML130, a specific NOD1 inhibitor, was used to block C12-iE-DAP stimulation. Stable knockdown (KD) of NOD1 in human colon cancer cells (HT29) was constructed with shRNA lentiviral transduction and the functional assays were thus repeated. Lastly, the predominant signaling pathway of NOD1-activation was identified using WB and functional assays in the presence of specific kinase inhibitors. Our data demonstrate that NOD1 is highly expressed in human colorectal cancer (CRC) and human and murine CRC cell lines. Clinically, we demonstrate that this increased NOD1 expression negatively impacts survival in patients with CRC. Subsequently, we identify NOD1 activation by C12-iE-DAP augments CRC cell adhesion, migration and metastasis. These effects are predominantly mediated via the p38 mitogen activated protein kinase (MAPK) pathway. This is the first study implicating NOD1 in cancer metastasis, and thus identifying this receptor as a putative therapeutic target.
Collapse
Affiliation(s)
- Henry Y Jiang
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada.,Department of Experimental Surgery and Department of Surgery, McGill University, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Sara Najmeh
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada.,Department of Experimental Surgery and Department of Surgery, McGill University, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Guy Martel
- Meakins-Christie Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Montreal, QC, H4A 3J1, Canada
| | - Elyse MacFadden-Murphy
- Meakins-Christie Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Montreal, QC, H4A 3J1, Canada
| | - Raquel Farias
- Meakins-Christie Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Montreal, QC, H4A 3J1, Canada
| | - Paul Savage
- The Rosalind and Morris Goodman Cancer Research Centre, McGill University, 1160 Pine Avenue, Montreal, QC, H3A 1A3, Canada
| | - Arielle Leone
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada.,Department of Experimental Surgery and Department of Surgery, McGill University, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Lucie Roussel
- Meakins-Christie Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Montreal, QC, H4A 3J1, Canada
| | - Jonathan Cools-Lartigue
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada.,Department of Experimental Surgery and Department of Surgery, McGill University, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Stephen Gowing
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada.,Department of Experimental Surgery and Department of Surgery, McGill University, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Julie Berube
- Meakins-Christie Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Montreal, QC, H4A 3J1, Canada
| | - Betty Giannias
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada
| | - France Bourdeau
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada
| | - Carlos H F Chan
- Department of Surgery, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, Iowa City, IA, 52242, USA
| | - Jonathan D Spicer
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada.,Department of Experimental Surgery and Department of Surgery, McGill University, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Rebecca McClure
- Department of Pathology, Health Sciences North, 41 Ramsey Lake Road, Sudbury, ON, Canada
| | - Morag Park
- The Rosalind and Morris Goodman Cancer Research Centre, McGill University, 1160 Pine Avenue, Montreal, QC, H3A 1A3, Canada
| | - Simon Rousseau
- Meakins-Christie Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Montreal, QC, H4A 3J1, Canada
| | - Lorenzo E Ferri
- Thoracic and Upper GI Cancer Research Laboratories, Research Institute of McGill University Health Centre, 1001 Decarie Boulevard, Block E, Lab #E02-4134, Montreal, QC, H4A 3J1, Canada. .,Department of Experimental Surgery and Department of Surgery, McGill University, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada.
| |
Collapse
|
11
|
Köffel R, Wolfmeier H, Larpin Y, Besançon H, Schoenauer R, Babiychuk VS, Drücker P, Pabst T, Mitchell TJ, Babiychuk EB, Draeger A. Host-Derived Microvesicles Carrying Bacterial Pore-Forming Toxins Deliver Signals to Macrophages: A Novel Mechanism of Shaping Immune Responses. Front Immunol 2018; 9:1688. [PMID: 30100903 PMCID: PMC6072879 DOI: 10.3389/fimmu.2018.01688] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 07/10/2018] [Indexed: 12/20/2022] Open
Abstract
Bacterial infectious diseases are a leading cause of death. Pore-forming toxins (PFTs) are important virulence factors of Gram-positive pathogens, which disrupt the plasma membrane of host cells and can lead to cell death. Yet, host defense and cell membrane repair mechanisms have been identified: i.e., PFTs can be eliminated from membranes as microvesicles, thus limiting the extent of cell damage. Released into an inflammatory environment, these host-derived PFTs-carrying microvesicles encounter innate immune cells as first-line defenders. This study investigated the impact of microvesicle- or liposome-sequestered PFTs on human macrophage polarization in vitro. We show that microvesicle-sequestered PFTs are phagocytosed by macrophages and induce their polarization into a novel CD14+MHCIIlowCD86low phenotype. Macrophages polarized in this way exhibit an enhanced response to Gram-positive bacterial ligands and a blunted response to Gram-negative ligands. Liposomes, which were recently shown to sequester PFTs and so protect mice from lethal bacterial infections, show the same effect on macrophage polarization in analogy to host-derived microvesicles. This novel type of polarized macrophage exhibits an enhanced response to Gram-positive bacterial ligands. The specific recognition of their cargo might be of advantage in the efficiency of targeted bacterial clearance.
Collapse
Affiliation(s)
- René Köffel
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | | | - Yu Larpin
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | - Hervé Besançon
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | | | | | | | - Thomas Pabst
- Department of Medical Oncology, University Hospital Bern, Bern, Switzerland
| | - Timothy J Mitchell
- College of Medical and Dental Sciences, Institute of Microbiology and Infection, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | | | | |
Collapse
|
12
|
Dysregulation of signaling pathways associated with innate antibacterial immunity in patients with pancreatic cancer. Cent Eur J Immunol 2017; 41:404-418. [PMID: 28450804 PMCID: PMC5382886 DOI: 10.5114/ceji.2016.65140] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Accepted: 09/16/2016] [Indexed: 02/07/2023] Open
Abstract
Disorders of innate antibacterial response are of fundamental importance in the development of gastrointestinal cancers, including pancreatic cancer. Multi-regulatory properties of the Toll-like receptors (TLRs) (e.g., regulation of proliferation, the activity of NF-κB, gene transcription of apoptosis proteins, regulation of angiogenesis, HIF-1α protein expression) are used in experimental studies to better understand the pathogenesis of pancreatic cancer, for early diagnosis, and for more effective therapeutic intervention. There are known numerous examples of TLR agonists (e.g., TLR2/5 ligands, TLR6, TLR9) of antitumor effect. The direction of these studies is promising, but a small number of them does not allow for an accurate assessment of the impact of TLR expression disorders, proteins of these signaling pathways, or attempts to block or stimulate them, on the results of treatment of pancreatic cancer patients. It is known, however, that the expression disorders of proteins of innate antibacterial response signaling pathways occur not only in tumor tissue but also in peripheral blood leukocytes of pancreatic cancer patients (e.g., increased expression of TLR4, NOD1, TRAF6), which is one of the most important factors facilitating further tumor development. This review mainly focuses on the genetic aspects of signaling pathway disorders associated with innate antibacterial response in the pathogenesis and diagnosis of pancreatic cancer.
Collapse
|
13
|
Fritz JH, Girardin SE. How Toll-like receptors and Nod-like receptors contribute to innate immunity in mammals. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519050110060301] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Innate immune detection of pathogens relies on specific classes of microbial sensors called pattern-recognition molecules (PRM). In mammals, such PRM include Toll-like receptors (TLRs) and the intracellular proteins NOD1 and NOD2, which belong to the family of Nod-like receptors (NLRs). Over the last decade as these molecules were discovered, a function in innate immunity has been assigned for the majority of them and, for most, the microbial motifs that these molecules detect were identified. One of the next challenges in innate immunity is to establish a better understanding of the complex interplay between signaling pathways induced simultaneously by distinct PRMs and how this affects tailoring first-line responses and the induction of adaptive immunity to a given pathogen.
Collapse
Affiliation(s)
- Jörg H. Fritz
- Immunité Innée et Signalisation Laboratoire, Institut Pasteur, Paris, France
| | | |
Collapse
|
14
|
Gene expression disorders of innate antibacterial signaling pathway in pancreatic cancer patients: implications for leukocyte dysfunction and tumor progression. Cent Eur J Immunol 2014; 39:498-507. [PMID: 26155170 PMCID: PMC4439963 DOI: 10.5114/ceji.2014.47736] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 09/30/2014] [Indexed: 01/01/2023] Open
Abstract
The study was carried out to investigate changes in gene expression of innate antibacterial signaling pathways in patients with pancreatic cancer. Expression of the following genes was measured in peripheral blood leukocytes of 55 patients with pancreatic adenocarcinoma using real-time polymerase chain reaction (RT-PCR): TLR4, NOD1, MyD88, TRAF6 and HMGB1. The levels of expression of TLR4, NOD1 and TRAF6 genes were significantly elevated (p = 0.007; p = 0.001 and p = 0.01, respectively), while MyD88 expression was markedly reduced (p = 0.0002), as compared to controls. Expression of TLR4 and NOD1 exceeded the normal level more than 3.5-fold and there was a significant correlation found between the expression of these genes (r = 0.558, p < 0.001). TLR4, NOD1 and MyD88 genes were expressed at a similar level both before and after surgery. No significant changes in the expression of HMGB1 gene were observed. The results of the study clearly indicate abnormal expression of genes belonging to innate antibacterial signaling pathways in peripheral blood leukocytes of patients with pancreatic cancer, which may lead to leukocyte dysfunction. Overexpression of TLR4, NOD1 and TRAF6 genes, and decreased MyD88 gene expression may contribute to chronic inflammation and tumor progression by up-regulation of the innate antibacterial response. The parameters tested are useful for monitoring innate immunity gene disorders and pancreatic cancer progression.
Collapse
|
15
|
Bacterial peptidoglycan stimulates adipocyte lipolysis via NOD1. PLoS One 2014; 9:e97675. [PMID: 24828250 PMCID: PMC4020832 DOI: 10.1371/journal.pone.0097675] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 04/23/2014] [Indexed: 01/07/2023] Open
Abstract
Obesity is associated with inflammation that can drive metabolic defects such as hyperlipidemia and insulin resistance. Specific metabolites can contribute to inflammation, but nutrient intake and obesity are also associated with altered bacterial load in metabolic tissues (i.e. metabolic endotoxemia). These bacterial cues can contribute to obesity-induced inflammation. The specific bacterial components and host receptors that underpin altered metabolic responses are emerging. We previously showed that Nucleotide-binding oligomerization domain-containing protein 1 (NOD1) activation with bacterial peptidoglycan (PGN) caused insulin resistance in mice. We now show that PGN induces cell-autonomous lipolysis in adipocytes via NOD1. Specific bacterial PGN motifs stimulated lipolysis in white adipose tissue (WAT) explants from WT, but not NOD1−/− mice. NOD1-activating PGN stimulated mitogen activated protein kinases (MAPK),protein kinase A (PKA), and NF-κB in 3T3-L1 adipocytes. The NOD1-mediated lipolysis response was partially reduced by inhibition of ERK1/2 or PKA alone, but not c-Jun N-terminal kinase (JNK). NOD1-stimulated lipolysis was partially dependent on NF-κB and was completely suppressed by inhibiting ERK1/2 and PKA simultaneously or hormone sensitive lipase (HSL). Our results demonstrate that bacterial PGN stimulates lipolysis in adipocytes by engaging a stress kinase, PKA, NF-κB-dependent lipolytic program. Bacterial NOD1 activation is positioned as a component of metabolic endotoxemia that can contribute to hyperlipidemia, systemic inflammation and insulin resistance by acting directly on adipocytes.
Collapse
|
16
|
Maharana J, Patra MC, De BC, Sahoo BR, Behera BK, De S, Pradhan SK. Structural insights into the MDP binding and CARD-CARD interaction in zebrafish (Danio rerio) NOD2: a molecular dynamics approach. J Mol Recognit 2014; 27:260-75. [DOI: 10.1002/jmr.2357] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Revised: 12/20/2013] [Accepted: 12/20/2013] [Indexed: 01/01/2023]
Affiliation(s)
- Jitendra Maharana
- Biotechnology Laboratory; Central Inland Fisheries Research Institute; Kolkata 700120 West Bengal India
| | - Mahesh Chandra Patra
- BIF-Centre, Department of Bioinformatics; Orissa University of Agriculture and Technology; Bhubaneswar 751003 Odisha India
- Animal Genomics Laboratory, Animal Biotechnology Centre; National Dairy Research Institute; Karnal 132001 Haryana India
| | - Bidhan Chandra De
- Biotechnology Laboratory; Central Inland Fisheries Research Institute; Kolkata 700120 West Bengal India
| | - Bikash Ranjan Sahoo
- BIF-Centre, Department of Bioinformatics; Orissa University of Agriculture and Technology; Bhubaneswar 751003 Odisha India
- Laboratory of Molecular Biophysics, Institute of Protein Research; Osaka University; Osaka Prefecture 5650871 Japan
| | - Bijay Kumar Behera
- Biotechnology Laboratory; Central Inland Fisheries Research Institute; Kolkata 700120 West Bengal India
| | - Sachinandan De
- Animal Genomics Laboratory, Animal Biotechnology Centre; National Dairy Research Institute; Karnal 132001 Haryana India
| | - Sukanta Kumar Pradhan
- BIF-Centre, Department of Bioinformatics; Orissa University of Agriculture and Technology; Bhubaneswar 751003 Odisha India
| |
Collapse
|
17
|
|
18
|
Towhid ST, Nega M, Schmidt EM, Schmid E, Albrecht T, Münzer P, Borst O, Götz F, Lang F. Stimulation of platelet apoptosis by peptidoglycan from Staphylococcus aureus 113. Apoptosis 2013; 17:998-1008. [PMID: 22752708 DOI: 10.1007/s10495-012-0718-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Peptidoglycan (PGN), a component of bacterial cell wall and belonging to "Microbe-Associated Molecular Patterns" (MAMP) triggers host reactions contributing to the pathophysiology of infectious disease. Host cell responses to PGN exposure include apoptosis. Bacterial infections may result in activation of blood platelets and thrombocytopenia. The present study explored, whether HPLC-purified fractions of PGNs from Staphylococcus aureus 113 triggers apoptosis of platelets. To this end platelets were exposed to PGN fractions and annexin-V binding determined to depict cell membrane scrambling, DiOC6 fluorescence to estimate depolarization of mitochondrial potential, Fluo-3AM staining for intracellular Ca(2+) activity ([Ca(2+)](i)) and immunofluorescence to quantify protein abundance of active caspase-3. As a result, a 30 min exposure to monomeric fraction (mPGN) (≥50 ng/ml) was followed by annexin-V binding, paralleled by increase of [Ca(2+)](i), mitochondrial depolarization, caspase-3 activation and integrin α(IIb)β(3) upregulation. The annexin-V binding was significantly blunted by anti-TLR-2 antibodies, in absence of extracellular Ca(2+), and by pancaspase inhibitor zVAD-FMK (1 μM). In conclusion, PGN triggers apoptosis of platelets in activation-dependent manner, characterized by mitochondrial depolarization, caspase-3 activation and cell membrane scrambling.
Collapse
Affiliation(s)
- Syeda T Towhid
- Department of Physiology, University of Tübingen, Gmelinstr. 5, 72076, Tübingen, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Initial immunopathogenesis of multiple sclerosis: innate immune response. Clin Dev Immunol 2013; 2013:413465. [PMID: 24174969 PMCID: PMC3794540 DOI: 10.1155/2013/413465] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Revised: 07/01/2013] [Accepted: 08/09/2013] [Indexed: 12/13/2022]
Abstract
Multiple sclerosis (MS) is an inflammatory, demyelinating, and neurodegenerative disease of the central nervous system. The hallmark to MS is the demyelinated plaque, which consists of a well-demarcated hypocellular area characterized by the loss of myelin, the formation of astrocytic scars, and the mononuclear cell infiltrates concentrated in perivascular spaces composed of T cells, B lymphocytes, plasma cells, and macrophages. Activation of resident cells initiates an inflammatory cascade, leading to tissue destruction, demyelination, and neurological deficit. The immunological phenomena that lead to the activation of autoreactive T cells to myelin sheath components are the result of multiple and complex interactions between environment and genetic background conferring individual susceptibility. Within the CNS, an increase of TLR expression during MS is observed, even in the absence of any apparent microbial involvement. In the present review, we focus on the role of the innate immune system, the first line of defense of the organism, as promoter and mediator of cross reactions that generate molecular mimicry triggering the inflammatory response through an adaptive cytotoxic response in MS.
Collapse
|
20
|
Shiny A, Regin B, Balachandar V, Gokulakrishnan K, Mohan V, Babu S, Balasubramanyam M. Convergence of innate immunity and insulin resistance as evidenced by increased nucleotide oligomerization domain (NOD) expression and signaling in monocytes from patients with type 2 diabetes. Cytokine 2013; 64:564-70. [PMID: 24018334 DOI: 10.1016/j.cyto.2013.08.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 06/17/2013] [Accepted: 08/02/2013] [Indexed: 01/01/2023]
Abstract
Despite the well known role of nucleotide oligomerization domain (NOD) receptor proteins in innate immunity, their association with diabetes is less explored. Here we report the transcriptional level of NODs and their downstream molecular signatures in CD14(+) monocytes from subjects with different grades of glucose tolerance. NOD1 and NOD2 mRNA expression were significantly up-regulated in monocytes from patients with type 2 diabetes (T2DM) and positively correlated with HOMA-IR and poor glycemic control. Patients with T2DM also exhibited increased monocyte activation markers (CD11b and CD36) and proinflammatory signals downstream of NOD (RIPK2 and NFκB) along with the increased circulatory levels of TNF-α and IL-6. In vitro stimulation of monocytes with NOD specific ligands-i-EDAP and MDP significantly up regulated the mRNA expression of NOD1 and NOD2 respectively in T2DM. Our study exposes up regulation of NODs in monocytes as an important component of inflammation and insulin resistance in patients with T2DM.
Collapse
Affiliation(s)
- Abhijit Shiny
- Department of Cell and Molecular Biology, Madras Diabetes Research Foundation and Dr. Mohan's Diabetes Specialities Centre, Gopalapuram, Chennai, India
| | | | | | | | | | | | | |
Collapse
|
21
|
Maharana J, Swain B, Sahoo BR, Dikhit MR, Basu M, Mahapatra AS, Jayasankar P, Samanta M. Identification of MDP (muramyl dipeptide)-binding key domains in NOD2 (nucleotide-binding and oligomerization domain-2) receptor of Labeo rohita. FISH PHYSIOLOGY AND BIOCHEMISTRY 2013; 39:1007-1023. [PMID: 23255217 DOI: 10.1007/s10695-012-9758-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Accepted: 12/06/2012] [Indexed: 06/01/2023]
Abstract
In lower eukaryotes-like fish, innate immunity contributed by various pattern recognition receptor (PRR) plays an essential role in protection against diseases. Nucleotide-binding and oligomerization domain (NOD)-2 is a cytoplasmic PRR that recognizes MDP (muramyl dipeptide) of the Gram positive and Gram negative bacteria as ligand and activates signalling to induce innate immunity. Hypothesizing a similar NOD2 signalling pathway of higher eukaryotes, the peripheral blood leucocytes (PBLs) of rohu (Labeo rohita) was stimulated with MDP. The data of quantitative real-time PCR (qRT-PCR) revealed MDP-mediated inductive expression of NOD2 and its down-stream molecule RICK/RIP2 (receptor-interacting serine-threonine protein kinase-2). This observation suggested the existence of MDP-binding sites in rohu NOD2 (rNOD2). To investigate it, 3D model of ligand-binding leucine-rich repeat (LRR) region of rNOD2 (rNOD2-LRR) was constructed following ab initio and threading approaches in I-TASSER web server. Structural refinement of the model was performed by energy minimization, and MD (molecular dynamics) simulation was performed in GROMACS (Groningen Machine for Chemical Simulations). The refined model of rNOD2-LRR was validated through SAVES, ProSA, ProQ, WHAT IF and MolProbity servers, and molecular docking with MDP was carried out in GOLD 4.1. The result of docking identified LRR3-7 comprising Lys820, Phe821, Asn822, Arg847, Gly849, Trp877, Trp901 and Trp931 as MDP-binding critical amino acids in rNOD2. This is the first study in fish to provide an insight into the 3D structure of NOD2-LRR region and its important motifs that are expected to be engaged in MDP binding and innate immunity.
Collapse
Affiliation(s)
- Jitendra Maharana
- Fish Health Management Division, Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar 751002, Odisha, India
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Abed M, Towhid ST, Pakladok T, Alesutan I, Götz F, Gulbins E, Lang F. Effect of bacterial peptidoglycan on erythrocyte death and adhesion to endothelial cells. Int J Med Microbiol 2013; 303:182-9. [PMID: 23537625 DOI: 10.1016/j.ijmm.2013.01.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 01/16/2013] [Accepted: 01/27/2013] [Indexed: 11/20/2022] Open
Abstract
Peptidoglycans, bacterial wall components, have previously been shown to trigger eryptosis, the suicidal erythrocyte death, characterized by cell shrinkage and cell membrane scrambling with phosphatidylserine exposure at the cell surface. Phosphatidylserine exposing erythrocytes adhere to the vascular wall at least partially by interaction of erythrocytic phosphatidylserine with endothelial CXC chemokine ligand 16 (CXCL16). The present study explored whether peptidoglycan exposure fosters the adhesion of erythrocytes to human umbilical vein endothelial cells (HUVEC). To this end, HUVEC were treated for 48 h with peptidoglycan (10 μg/ml) and CXCL16 abundance determined by confocal microscopy and FACS analysis. Moreover, human erythrocytes were exposed for 48 h to peptidoglycan (10 μg/ml) and phosphatidylserine exposure estimated from binding of fluorescent annexin-V, cell volume from forward scatter in FACS analysis and erythrocyte adhesion to human umbilical vein endothelial cells (HUVEC) from trapping of labeled erythrocytes in a flow chamber. As a result, bacterial peptidoglycan exposure was followed by increased CXCL16 expression in HUVEC as well as erythrocyte shrinkage, phosphatidylserine exposure and adhesion to HUVEC under flow conditions at arterial shear rates. The adhesion was significantly attenuated but not abrogated in the presence of either, erythrocyte phosphatidylserine-coating annexin-V (5 μl/ml) or CXCL16 neutralizing antibody directed against endothelial CXCL16 (4 μg/ml). In conclusion, exposure to peptidoglycan increases endothelial CXCL16 expression and leads to eryptosis followed by phosphatidylserine- and CXCL16-mediated adhesion of eryptotic erythrocytes to vascular endothelial cells.
Collapse
Affiliation(s)
- Majed Abed
- Department of Physiology, University of Tuebingen, Tuebingen, Germany
| | | | | | | | | | | | | |
Collapse
|
23
|
Veyrier FJ, Williams AH, Mesnage S, Schmitt C, Taha MK, Boneca IG. De-O-acetylation of peptidoglycan regulates glycan chain extension and affectsin vivosurvival ofNeisseria meningitidis. Mol Microbiol 2013; 87:1100-12. [DOI: 10.1111/mmi.12153] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/09/2013] [Indexed: 01/21/2023]
Affiliation(s)
| | | | - Stéphane Mesnage
- Centre de Recherches des Cordeliers; Inserm U872; 15 rue de l'Ecole de Médecine; Paris; F-75006; France
| | - Christine Schmitt
- Institut Pasteur; Plate-forme de Microscopie Ultrastructurale; Département de Biologie Cellulaire et Infection; Paris; F-75015; France
| | - Muhamed-Kheir Taha
- Institut Pasteur; Infections Bactériennes Invasives; Département Infection et Epidémiologie; 28 Rue du Dr. Roux; Paris; F-75015; France
| | | |
Collapse
|
24
|
Amatngalim GD, Nijnik A, Hiemstra PS, Hancock REW. Cathelicidin peptide LL-37 modulates TREM-1 expression and inflammatory responses to microbial compounds. Inflammation 2012; 34:412-25. [PMID: 20811938 DOI: 10.1007/s10753-010-9248-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Inflammatory diseases remain an important cause of morbidity and mortality. Cathelicidins are immunomodulatory and antimicrobial peptides with potent anti-endotoxic properties. Although the effects of the human cathelicidin LL-37 on cellular responses to Toll-like receptor (TLR) ligands have been investigated, its effects on responses to other pro-inflammatory stimuli have not been well studied. Triggering receptor expressed on myeloid cells (TREM-1) acts to amplify inflammatory responses and plays important roles in the pathogenesis of endotoxemia. In this work, the effects of LL-37 on responses to TREM-1 stimulation, alone and in the presence of a range of microbial compounds, were analyzed. It was shown that in peripheral blood mononuclear cells LL-37 strongly suppressed synergistic responses to TREM-1 and TLR4 stimulation, partly through the inhibition of TREM-1 expression on monocytes; similar effects were observed using the TLR2 ligand lipoteichoic acid. In contrast, LL-37 stimulated TREM-1 upregulation by peptidoglycan (PGN, TLR2 ligand that is also recognized via nucleotide-binding oligomerization domain containing 2 after fragmentation and intracellular uptake), as well as the responses to combined TREM-1 and PGN stimulation, possibly via the p38 mitogen-activated protein kinase pathway. LL-37 did not affect TREM-1-induced neutrophil degranulation or the production of reactive oxygen species and interleukin-8 by neutrophils. These findings provide further insight into the roles of LL-37 during inflammation and may have implications for its in vivo immunomodulatory properties and for the design of synthetic cathelicidin derivatives as anti-inflammatory and anti-endotoxic molecules.
Collapse
Affiliation(s)
- Gimano D Amatngalim
- Department of Microbiology and Immunology, Centre for Microbial Diseases and Immunity Research, University of British Columbia, 2259 Lower Mall Research Station, Vancouver, V6T 1Z4, Canada
| | | | | | | |
Collapse
|
25
|
Danelishvili L, Everman JL, McNamara MJ, Bermudez LE. Inhibition of the Plasma-Membrane-Associated Serine Protease Cathepsin G by Mycobacterium tuberculosis Rv3364c Suppresses Caspase-1 and Pyroptosis in Macrophages. Front Microbiol 2012; 2:281. [PMID: 22275911 PMCID: PMC3257866 DOI: 10.3389/fmicb.2011.00281] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Accepted: 12/28/2011] [Indexed: 01/07/2023] Open
Abstract
Tuberculosis is a disease associated with the infection of a great part of the world’s population and is responsible for the death of two to three million people annually. Mycobacterium tuberculosis infects macrophages and subverts its mechanisms of killing. The pathogen suppresses macrophage apoptosis by many different mechanisms. We describe that, upon uptake by macrophages, M. tuberculosis overexpresses an operon Rv3361c-Rv3365c and secretes Rv3364c. The Rv3365c knockout strain is deficient in apoptosis inhibition. The Rv3364c protein binds to the serine protease cathepsin G on the membrane, inhibiting its enzymatic activity and the downstream activation of caspase-1-dependent apoptosis. In summary, M. tuberculosis prevents macrophage pyroptosis by a novel mechanism involving cytoplasmic surveillance proteins.
Collapse
Affiliation(s)
- Lia Danelishvili
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University Corvallis, OR, USA
| | | | | | | |
Collapse
|
26
|
Schertzer JD, Tamrakar AK, Magalhães JG, Pereira S, Bilan PJ, Fullerton MD, Liu Z, Steinberg GR, Giacca A, Philpott DJ, Klip A. NOD1 activators link innate immunity to insulin resistance. Diabetes 2011; 60:2206-15. [PMID: 21715553 PMCID: PMC3161332 DOI: 10.2337/db11-0004] [Citation(s) in RCA: 204] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Insulin resistance associates with chronic inflammation, and participatory elements of the immune system are emerging. We hypothesized that bacterial elements acting on distinct intracellular pattern recognition receptors of the innate immune system, such as bacterial peptidoglycan (PGN) acting on nucleotide oligomerization domain (NOD) proteins, contribute to insulin resistance. RESEARCH DESIGN AND METHODS Metabolic and inflammatory properties were assessed in wild-type (WT) and NOD1/2(-/-) double knockout mice fed a high-fat diet (HFD) for 16 weeks. Insulin resistance was measured by hyperinsulinemic euglycemic clamps in mice injected with mimetics of meso-diaminopimelic acid-containing PGN or the minimal bioactive PGN motif, which activate NOD1 and NOD2, respectively. Systemic and tissue-specific inflammation was assessed using enzyme-linked immunosorbent assays in NOD ligand-injected mice. Cytokine secretion, glucose uptake, and insulin signaling were assessed in adipocytes and primary hepatocytes exposed to NOD ligands in vitro. RESULTS NOD1/2(-/-) mice were protected from HFD-induced inflammation, lipid accumulation, and peripheral insulin intolerance. Conversely, direct activation of NOD1 protein caused insulin resistance. NOD1 ligands induced peripheral and hepatic insulin resistance within 6 h in WT, but not NOD1(-/-), mice. NOD2 ligands only modestly reduced peripheral glucose disposal. NOD1 ligand elicited minor changes in circulating proinflammatory mediators, yet caused adipose tissue inflammation and insulin resistance of muscle AS160 and liver FOXO1. Ex vivo, NOD1 ligand caused proinflammatory cytokine secretion and impaired insulin-stimulated glucose uptake directly in adipocytes. NOD1 ligand also caused inflammation and insulin resistance directly in primary hepatocytes from WT, but not NOD1(-/-), mice. CONCLUSIONS We identify NOD proteins as innate immune components that are involved in diet-induced inflammation and insulin intolerance. Acute activation of NOD proteins by mimetics of bacterial PGNs causes whole-body insulin resistance, bolstering the concept that innate immune responses to distinctive bacterial cues directly lead to insulin resistance. Hence, NOD1 is a plausible, new link between innate immunity and metabolism.
Collapse
Affiliation(s)
- Jonathan D. Schertzer
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Akhilesh K. Tamrakar
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Joao G. Magalhães
- Department of Immunology, Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Sandra Pereira
- Department of Physiology, Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Philip J. Bilan
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | | | - Zhi Liu
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | | | - Adria Giacca
- Department of Physiology, Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Dana J. Philpott
- Department of Immunology, Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Amira Klip
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada
- Corresponding author: Amira Klip,
| |
Collapse
|
27
|
Hubbard VM, Cadwell K. Viruses, autophagy genes, and Crohn's disease. Viruses 2011; 3:1281-311. [PMID: 21994779 PMCID: PMC3185787 DOI: 10.3390/v3071281] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 07/12/2011] [Accepted: 07/13/2011] [Indexed: 02/08/2023] Open
Abstract
The etiology of the intestinal disease Crohn's disease involves genetic factors as well as ill-defined environmental agents. Several genetic variants linked to this disease are associated with autophagy, a process that is critical for proper responses to viral infections. While a role for viruses in this disease remains speculative, accumulating evidence indicate that this possibility requires serious consideration. In this review, we will examine the three-way relationship between viruses, autophagy genes, and Crohn's disease and discuss how host-pathogen interactions can mediate complex inflammatory disorders.
Collapse
Affiliation(s)
| | - Ken Cadwell
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-212-263-8891; Fax: +1-212-263-5711
| |
Collapse
|
28
|
Scott DA, Bagaitkar J. Smoking, Infectious Diseases and Innate Immune (Dys)function. CIGARETTE SMOKE TOXICITY 2011:191-215. [DOI: 10.1002/9783527635320.ch10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2025]
|
29
|
Słotwiński R, Słotwińska S, Kędziora S, Bałan BJ. Innate immunity signaling pathways: links between immunonutrition and responses to sepsis. Arch Immunol Ther Exp (Warsz) 2011; 59:139-50. [PMID: 21298487 DOI: 10.1007/s00005-011-0117-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2010] [Accepted: 07/30/2010] [Indexed: 01/12/2023]
Abstract
Septic infections in patients treated in intensive care units show the highest mortality rates. Despite advances in treatment methods, there is still no therapy available to efficiently reduce the excessive inflammatory response, which can increase the risk of multiple organ failure. One of the ways to discover new, more efficient treatment methods involves regulating the mechanisms of inflammatory response to a massive infection. Toll-like receptors (TLRs) that recognize pathogen-associated molecular patterns play a significant role in innate antibacterial and inflammatory responses. The regulatory impact of immunonutrition on TLR expression in septic patients seems to be a promising research direction. This paper presents the main mechanisms for the innate immune response to lipopolysaccharide, based on the research results for both TLR-dependent and independent signaling pathways. Special emphasis was put on the research results for the TLR-dependent immune response and the anti-bacterial/anti-inflammatory response after applying immunonutrition with increased concentrations of glutamine and unsaturated fatty acids.
Collapse
Affiliation(s)
- Robert Słotwiński
- Department of Surgical Research and Transplantology, Polish Academy of Sciences Medical Research Center, Warsaw, Poland.
| | | | | | | |
Collapse
|
30
|
Saïd-Sadier N, Padilla E, Langsley G, Ojcius DM. Aspergillus fumigatus stimulates the NLRP3 inflammasome through a pathway requiring ROS production and the Syk tyrosine kinase. PLoS One 2010; 5:e10008. [PMID: 20368800 PMCID: PMC2848854 DOI: 10.1371/journal.pone.0010008] [Citation(s) in RCA: 231] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Accepted: 03/16/2010] [Indexed: 11/30/2022] Open
Abstract
Invasive aspergillosis (IA) is a life-threatening disease that occurs in immunodepressed patients when infected with Aspergillus fumigatus. This fungus is the second most-common causative agent of fungal disease after Candida albicans. Nevertheless, much remains to be learned about the mechanisms by which A. fulmigatus activates the innate immune system. We investigated the inflammatory response to conidia and hyphae of A. fumigatus and specifically, their capacity to trigger activation of an inflammasome. Our results show that in contrast to conidia, hyphal fragments induce NLRP3 inflammasome assembly, caspase-1 activation and IL-1β release from a human monocyte cell line. The ability of Aspergillus hyphae to activate the NLRP3 inflammasome in the monocytes requires K+ efflux and ROS production. In addition, our data show that NLRP3 inflammasome activation as well as pro-IL-1β expression relies on the Syk tyrosine kinase, which is downstream from the pathogen recognition receptor Dectin-1, reinforcing the importance of Dectin-1 in the innate immune response against fungal infection. Furthermore, we show that treatment of monocytes with corticosteroids inhibits transcription of the gene encoding IL-1β. Thus, our data demonstrate that the innate immune response against A. fumigatus infection involves a two step activation process, with a first signal promoting expression and synthesis of pro-IL-1β; and a second signal, involving Syk-induced activation of the NLRP3 inflammasome and caspase-1, allowing processing and secretion of the mature cytokine.
Collapse
Affiliation(s)
- Najwane Saïd-Sadier
- Health Sciences Research Institute and School of Natural Sciences, University of California Merced, Merced, California, United States of America
- Graduate Group “Biochimie, Biothérapies, Biologie Moléculaire et Infectiologie”, Université Paris Diderot, Paris, France
| | - Eduardo Padilla
- Health Sciences Research Institute and School of Natural Sciences, University of California Merced, Merced, California, United States of America
| | - Gordon Langsley
- Graduate Group “Biochimie, Biothérapies, Biologie Moléculaire et Infectiologie”, Université Paris Diderot, Paris, France
- Institut Cochin, Université Paris Descartes, CNRS UMR 8104, INSERM U1016, Paris, France
| | - David M. Ojcius
- Health Sciences Research Institute and School of Natural Sciences, University of California Merced, Merced, California, United States of America
- * E-mail:
| |
Collapse
|
31
|
Messlik A, Schmechel S, Kisling S, Bereswill S, Heimesaat MM, Fischer A, Göbel U, Haller D. Loss of Toll-like receptor 2 and 4 leads to differential induction of endoplasmic reticulum stress and proapoptotic responses in the intestinal epithelium under conditions of chronic inflammation. J Proteome Res 2010; 8:4406-17. [PMID: 19681597 DOI: 10.1021/pr9000465] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Toll-like receptors (TLRs) play an important role in the recognition of microbial molecular patterns of infectious and commensal bacteria and their expression in various tissues including the intestinal epithelium orchestration of the innate and adaptive immune defense mechanisms. Changes in the TLR signaling pathways due to host genetic predispositions may turn a physiological response into a pathological situation including failure of bacterial clearance and development of chronic inflammation. The aim of this study was to characterize the role of TLR2 or TLR4 deficiency in epithelial cell stress responses under noninflamed and inflamed conditions using TLR-deficient mice and TLR(-/-) cross-bred IL-10-deficient mice as a model for genetically driven experimental colitis. Primary intestinal epithelial cells (IEC) were isolated from specific-pathogen-free wild-type, TLR2-, TLR4-, IL-10-, IL-10XTLR2- and IL-10XTLR4-deficient mice at the age of 1, 8, and 16 weeks. Histopathological analysis showed absence of tissue pathology (score 0-12) in distal colon sections of TLR2- and TLR4-deficient mice. In addition, TLR2- but not TLR4-deficient mice cross-bred to the IL-10-deficient background develop moderate colitis, suggesting different effects of these pattern recognition receptors in regulating disease mechanisms. Proteome analysis revealed significantly regulated proteins associated with endoplasmic reticulum (ER) and mitochondrial stress responses in the epithelium. In contrast to TLR2(-/-) and IL-10XTLR2(-/-) mice, the induction of the ER-associated chaperone grp-78 was dissociated from the activation of proapoptotic caspase 3 cleavage in noninflamed TLR4(-/-) and IL10XTLR4(-/-) mice. These results suggest that ER-associated cellular stress responses play an important role in epithelial cells homeostasis leading to beneficial but also deleterious effects. We hypothesize that ER stress-associated processes in the absence of TLR2 and TLR4 differentially affect host responses and epithelial functions under conditions of genetically driven chronic intestinal inflammation.
Collapse
Affiliation(s)
- Anja Messlik
- Chair for Biofunctionality, CDD-Center for Diet and Disease, ZIEL-Research Center for Nutrition and Food Science, Technische Universität München, Am Forum 5, Freising-Weihenstephan, Germany
| | | | | | | | | | | | | | | |
Collapse
|
32
|
Lee SW, Han SW, Sririyanum M, Park CJ, Seo YS, Ronald PC. RETRACTED: A type I-secreted, sulfated peptide triggers XA21-mediated innate immunity. Science 2009; 326:850-3. [PMID: 19892983 DOI: 10.1126/science.1173438] [Citation(s) in RCA: 165] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The rice Xa21 gene confers immunity to most strains of the bacterium Xanthomonas oryzae pv. oryzae (Xoo). Liquid chromatography-tandem mass spectrometry analysis of biologically active fractions from Xoo supernatants led to the identification of a 194-amino acid protein designated Ax21 (activator of XA21-mediated immunity). A sulfated, 17-amino acid synthetic peptide (axY(S)22) derived from the N-terminal region of Ax21 is sufficient for activity, whereas peptides lacking tyrosine sulfation are biologically inactive. Using coimmunoprecipitation, we found that XA21 is required for axY(S)22 binding and recognition. axY(S)22 is 100% conserved in all analyzed Xanthomonas species, confirming that Ax21 is a pathogen-associated molecular pattern and that XA21 is a pattern recognition receptor.
Collapse
Affiliation(s)
- Sang-Won Lee
- Department of Plant Pathology, University of California, Davis, CA 95616, USA
| | | | | | | | | | | |
Collapse
|
33
|
Nonhematopoietic cells control the outcome of infection with Listeria monocytogenes in a nucleotide oligomerization domain 1-dependent manner. Infect Immun 2009; 77:2908-18. [PMID: 19398545 DOI: 10.1128/iai.01068-08] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We analyzed the defensive role of the cytosolic innate recognition receptor nucleotide oligomerization domain 1 (NOD1) during infection with Listeria monocytogenes. Mice lacking NOD1 showed increased susceptibility to systemic intraperitoneal and intravenous infection with high or low doses of L. monocytogenes, as measured by the bacterial load and survival. NOD1 also controlled dissemination of L. monocytogenes into the brain. The increased susceptibility to reinfection of NOD1(-/-) mice was not associated with impaired triggering of listeria-specific T cells, and similar levels of costimulatory molecules or activation of dendritic cells was observed. Higher numbers of F480(+) Gr1(+) inflammatory monocytes and lower numbers of F480(-) Gr1(+) neutrophils were recruited into the peritoneum of infected WT mice than into the peritoneum of infected NOD1(-/-) mice. We determined that nonhematopoietic cells accounted for NOD1-mediated resistance to L. monocytogenes in bone marrow radiation chimeras. The levels of NOD1 mRNA in fibroblasts and bone marrow-derived macrophages (BMM) were upregulated after infection with L. monocytogenes or stimulation with different Toll-like receptor ligands. NOD1(-/-) BMM, astrocytes, and fibroblasts all showed enhanced intracellular growth of L monocytogenes compared to WT controls. Gamma interferon-mediated nitric oxide production and inhibition of L. monocytogenes growth were hampered in NOD1(-/-) BMM. Thus, NOD1 confers nonhematopoietic cell-mediated resistance to infection with L. monocytogenes and controls intracellular bacterial growth in different cell populations in vitro.
Collapse
|
34
|
Farkas L, Stoelcker B, Jentsch N, Heitzer S, Pfeifer M, Schulz C. Muramyldipeptide modulates CXCL-8 release of BEAS-2B cells via NOD2. Scand J Immunol 2008; 68:315-22. [PMID: 18647246 DOI: 10.1111/j.1365-3083.2008.02145.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Chronic inflammation and acute exacerbations are pathophysiological features of chronic obstructive pulmonary disease (COPD). An impaired immune response to bacterial pathogens can contribute to both of them. Nucleotide oligomerization domain 2 (NOD2) is an intracellular receptor of innate immunity for muramyldipeptide (MDP). Mutations of the NOD2 gene followed by decreased recognition of MDP are associated with chronic intestinal inflammation and pulmonary complications of patients with allogenic stem cell transplant and sepsis. Our study provides evidence that NOD2, toll-like receptor 4 (TLR4) and the adapter protein receptor-interacting protein 2 (RIP2) are induced by tumor-necrosis factor-alpha (TNF-alpha) and interferon-gamma (IFN-gamma) in the bronchial epithelial cell line BEAS-2B. We also demonstrate that lipopolysaccharide (LPS) can further increase NOD2 transcription in a TNF-alpha and IFN-gamma-induced activation state. In addition, we show that, while MDP fails to enhance CXCL-8 release from otherwise unstimulated BEAS-2B cells, a 12 h prestimulation period with TNF-alpha and IFN-gamma primes the cells for an additional increase of CXCL-8 secretion via induction of NOD2 and RIP2. LPS itself significantly augments CXCL-8 production and co-administration of MDP further increases cytokine secretion. Finally, overexpression of an SNP13 mutant decreased MDP-induced chemokine production in BEAS-2B cells compared with NOD2 wild type overexpression. Taken together, our work indicates that MDP and NOD2 play an important role for CXCL-8 release of BEAS-2B cells following LPS-challenge via synergistic interactions between MDP and LPS.
Collapse
Affiliation(s)
- L Farkas
- Klinik und Poliklinik für Innere Medizin II, Universität Regensburg, Regensburg, Germany.
| | | | | | | | | | | |
Collapse
|
35
|
Huang S, Zhao L, Kim K, Lee DS, Hwang DH. Inhibition of Nod2 signaling and target gene expression by curcumin. Mol Pharmacol 2008; 74:274-81. [PMID: 18413660 PMCID: PMC2593422 DOI: 10.1124/mol.108.046169] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Nod2 is an intracellular pattern recognition receptor that detects a conserved moiety of bacterial peptidoglycan and subsequently activates proinflammatory signaling pathways. Mutations in Nod2 have been implicated to be linked to inflammatory granulomatous disorders, such as Crohn's disease and Blau syndrome. Many phytochemicals possess anti-inflammatory properties. However, it is not known whether any of these phytochemicals might modulate Nod2-mediated immune responses and thus might be of therapeutic value for the intervention of these inflammatory diseases. In this report, we demonstrate that curcumin, a polyphenol found in the plant Curcuma longa, and parthenolide, a sesquiterpene lactone, suppress both ligand-induced and lauric acid-induced Nod2 signaling, leading to the suppression of nuclear factor-kappaB activation and target gene interleukin-8 expression. We provide molecular and biochemical evidence that the suppression is mediated through the inhibition of Nod2 oligomerization and subsequent inhibition of downstream signaling. These results demonstrate for the first time that curcumin and parthenolide can directly inhibit Nod2-mediated signaling pathways at the receptor level and suggest that Nod2-mediated inflammatory responses can be modulated by these phytochemicals. It remains to be determined whether these phytochemicals possess protective or therapeutic efficacy against Nod2-mediated inflammatory disorders.
Collapse
Affiliation(s)
- Shurong Huang
- Western Human Nutrition Research Center, United States Department of Agriculture, Agricultural Research Service, Davis, CA 95616, USA
| | | | | | | | | |
Collapse
|
36
|
Falsig J, van Beek J, Hermann C, Leist M. Molecular basis for detection of invading pathogens in the brain. J Neurosci Res 2008; 86:1434-47. [DOI: 10.1002/jnr.21590] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
37
|
Clavel T, Haller D. Bacteria- and host-derived mechanisms to control intestinal epithelial cell homeostasis: implications for chronic inflammation. Inflamm Bowel Dis 2007; 13:1153-64. [PMID: 17476679 DOI: 10.1002/ibd.20174] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The genetic predisposition to deregulated mucosal immune responses and the concurrent prevalence of certain environmental triggers in developed countries are strong etiologic factors for the development of inflammatory bowel diseases in human subjects, including Crohn's disease and ulcerative colitis. Numerous clinical and experimental studies have shown that the intestinal microbes are critical for the initiation and progression of chronic intestinal inflammation. Activation of pattern recognition receptor signaling via members of the Toll-like receptor (TLR) and the nucleotide-binding oligomerization domain (NOD)-like families initiates inflammatory defense mechanisms that are required to alert and protect the host. Key inflammatory mechanisms such as nuclear transcription factor kappaB (NF-kappaB) activation and endoplasmic reticulum stress responses are controlled by a complex network of pathways that includes intrinsic feedback effectors and is targeted by immunosuppressive cytokines such as interleukin 10 (IL-10) and transforming growth factor (TGF)-beta. In the absence or after functional loss of these antiinflammatory feedback signals, physiological defense mechanisms may turn into pathological responses. The data discussed in the present review suggest that disturbances in the homeostasis between bacteria- and host-derived signals at the epithelial cell level lead to a break in the intestinal barrier function and to the development of mucosal immune disorders in genetically susceptible hosts.
Collapse
Affiliation(s)
- Thomas Clavel
- Technical University of Munich, Experimental Nutritional Medicine, Else Kröner-Fresenius-Center, Freising-Weihenstephan, Germany
| | | |
Collapse
|
38
|
Wu L, Feng BS, He SH, Zheng PY, Croitoru K, Yang PC. Bacterial peptidoglycan breaks down intestinal tolerance via mast cell activation: the role of TLR2 and NOD2. Immunol Cell Biol 2007; 85:538-45. [PMID: 17563761 DOI: 10.1038/sj.icb.7100079] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Intestinal microbes are believed to be involved in the pathogenesis of inflammatory bowel disease. Microbes and their products are generally well tolerated by intestinal epithelial cells in the intestinal tract of healthy individuals. It is of significance to understand what breaks down the established tolerance leading to intestinal barrier dysfunction and intestinal inflammation. T84 monolayer transported peptidoglycan (PGN) was determined by enzyme-linked immune assay. Mast cell line HMC-1 cell activation in response to PGN stimulation was observed with electron microscopy and measurement of histamine release. T84 monolayer barrier function was determined by recording the transepithelial electric resistance (TER) and measuring the permeability in response to PGN-induced HMC-1 cell activation. Expression of Toll-like receptor (TLR) 2 and nucleotide-binding oligomerization domain (NOD) 2 were determined by immunocytochemistry, real-time reverse transcription (RT)-PCR and Western blot. Exposure to PGN alone did not alter TER and permeability of T84 monolayers. T84 monolayers transported PGN from the apical chamber to the basal chamber of transwell system. TLR2 expressed on the surface of HMC-1 cells. HMC-1 cells absorbed PGN. HMC-1 cells released histamine in response to the PGN stimulation, which was blocked by pretreatment with antibodies or small interfering RNA against TLR2 or NOD2. In a co-culture system, T84 monolayer transported PGN activated HMC-1 cells and increased the horseradish peroxidase flux. TLR2 mediated the PGN-absorption in HMC-1 cells. Blockade of TLR2 or NOD2 abolished PGN-induced HMC-1 cell activation and T84 monolayer barrier dysfunction. T84 monolayer transported PGN activates HMC-1 cells to release chemical mediators to induce T84 monolayer dysfunction that are mediated by TLR2 and NOD2.
Collapse
Affiliation(s)
- Linda Wu
- Pathology & Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | | | | | | | | | | |
Collapse
|
39
|
Werner T, Haller D. Intestinal epithelial cell signalling and chronic inflammation: From the proteome to specific molecular mechanisms. Mutat Res 2007; 622:42-57. [PMID: 17628614 DOI: 10.1016/j.mrfmmm.2007.05.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Advancing knowledge regarding the cellular mechanisms of intestinal inflammation has led to a better understanding of the disease pathology in patients with inflammatory bowel disease (IBD) including Crohn's disease and ulcerative colitis. It has become clear from numerous studies that enteric bacteria are a critical component in the development and prevention/treatment of chronic intestinal inflammation. An emerging new paradigm suggests that changes in the homeostasis of bacteria- and host-derived signal transduction at the intestinal epithelial cell (IEC) level may lead to a break in barrier function and the development of adaptive immune disturbances. The functional loss of anti-inflammatory host-derived signals in the gut including the immunosuppressive cytokines Interleukin 10 (IL-10) and transforming growth factor (TGF)-beta are of high relevance to the pathogenesis of IBD. The development of analytical tools including two-dimensional (2D) high-resolution protein separation techniques and peptide mass fingerprinting via high-sensitivity mass-spectrometers (MS) allows the quantitative assessment of protein expression changes in disease-relevant cell types. By using these advanced methods, the characterization of the epithelial cell proteome from murine models of experimental colitis and human IBD patients identified novel disease-related mechanisms with respect to the regulation of the glucose-regulated endoplasmic reticulum stress response protein 78 (grp-78). In conclusion, the identification and functional analysis of differentially expressed proteins in purified intestinal target cell types will help to add important insights to the understanding of the molecular pathogenesis of these immune-mediated chronic intestinal disorders.
Collapse
Affiliation(s)
- Tanja Werner
- Technical University of Munich, Experimental Nutritional Medicine, Else-Kroener-Fresenius-Center, Am Forum 5, 85350 Freising-Weihenstephan, Germany
| | | |
Collapse
|
40
|
García-Suárez MDM, Vázquez F, Méndez FJ. Streptococcus pneumoniae virulence factors and their clinical impact: An update. Enferm Infecc Microbiol Clin 2007; 24:512-7. [PMID: 16987470 DOI: 10.1157/13092469] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The morbidity and mortality rates associated with Streptococcus pneumoniae remain very high worldwide. The virulence of this bacterium is largely dependent on its polysaccharide capsule, which is quite heterogeneous and represents a serious obstacle for designing effective vaccines. However, it has been demonstrated that numerous protein virulence factors are involved in the pathogenesis of pneumococcal disease. An important related finding from experimental animal models is that non-capsulated strains of pneumococci are protective against capsulated ones. Hence, new vaccine designs are focused on the surface proteins (e. g., PspA and PspC) and on the cytolysin, pneumolysin. Moreover, several virulence factors have potential value for pneumococcal diagnosis by urinalysis. In this paper, we review the virulence factors involved in bacteria-host interactions, and the new developments in vaccines and diagnostic methods.
Collapse
Affiliation(s)
- María del Mar García-Suárez
- Area de Microbiología, Departamento de Biología Funcional, Facultad de Medicina, Universidad de Oviedo, España.
| | | | | |
Collapse
|
41
|
Zhao L, Kwon MJ, Huang S, Lee JY, Fukase K, Inohara N, Hwang DH. Differential Modulation of Nods Signaling Pathways by Fatty Acids in Human Colonic Epithelial HCT116 Cells. J Biol Chem 2007; 282:11618-28. [PMID: 17303577 DOI: 10.1074/jbc.m608644200] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Nucleotide-binding oligomerization domain-containing proteins (Nods) are intracellular pattern recognition receptors recognizing conserved moieties of bacterial peptidoglycan through their leucine-rich repeats domain. The agonists for Nods activate proinflammatory signaling pathways, including NF-kappaB pathways. The results from our previous studies showed that the activation of TLR4 and TLR2, leucine-rich repeat-containing pattern recognition receptors, were differentially modulated by saturated and n-3 polyunsaturated fatty acids in macrophages and dendritic cells. Here, we show the differential modulation of NF-kappaB activation and interleukin-8 (IL-8) expression in colonic epithelial cells HCT116 by saturated and unsaturated fatty acids mediated through Nods proteins. Lauric acid (C12:0) dose dependently activated NF-kappaB and induced IL-8 expression in HCT116 cells, which express both Nod1 and Nod2, but not detectable amounts of TLR2 and TLR4. These effects of lauric acid were inhibited by dominant negative forms of Nod1 or Nod2, but not by dominant negative forms of TLR2, TLR4, and TLR5. The effects of lauric acid were also attenuated by small RNA interference targeting Nod1 or Nod2. In contrast, polyunsaturated fatty acids, especially n-3 polyunsaturated fatty acids, inhibited the activation of NF-kappaB and IL-8 expression induced by lauric acid or known Nods ligands in HCT116. Furthermore, lauric acid induced, but docosahexaenoic acid inhibited lauric acid- or Nod2 ligand MDP-induced, Nod2 oligomerization in HEK293T cells transfected with Nod2. Together, these results provide new insights into the role of dietary fatty acids in modulating inflammation in colon epithelial cells. The results suggest that Nods may be involved in inducing sterile inflammation, one of the key etiological conditions in the development of many chronic inflammatory diseases.
Collapse
Affiliation(s)
- Ling Zhao
- Western Human Nutrition Research Center, The Agricultural Research Service-United States Department of Agriculture, Davis, California 95616, USA
| | | | | | | | | | | | | |
Collapse
|
42
|
Ferencík M, Stvrtinová V, Hulín I, Novák M. Inflammation — a lifelong companion. Folia Microbiol (Praha) 2007; 52:159-73. [PMID: 17575915 DOI: 10.1007/bf02932155] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Inflammation is a key component of the immune system. It has important functions in both defense and pathophysiological events maintaining the dynamic homeostasis of a host organism including its tissues, organs and individual cells. On the cellular level it is controlled by more than 400 currently known genes. Their polymorphisms and environmental conditions give rise to different genotypes in human population. Pro-inflammatory genotype, which dominates in the present population, may be advantageous in childhood but not in elderly people because it is characterized by an increased vulnerability to, and intensity of, inflammatory reactions. These reactions may be the possible reasons of chronic inflammatory diseases, especially in old age. Better understanding of complex molecular and cellular inflammatory mechanisms is indispensable for detailed knowledge of pathogenesis of many diseases, their prevention and directed drug therapy. Here we summarize the basic current knowledge on these mechanisms.
Collapse
Affiliation(s)
- M Ferencík
- Faculty of Medicine, Comenius University, 811 08 Bratislava, Slovakia.
| | | | | | | |
Collapse
|
43
|
Carneiro LAM, Travassos LH, Girardin SE. Nod-like receptors in innate immunity and inflammatory diseases. Ann Med 2007; 39:581-93. [PMID: 18038361 DOI: 10.1080/07853890701576172] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Over the past few years the field of innate immunity has undergone a revolution with the discovery of pattern recognition molecules (PRM) and their role in microbe detection. Among these molecules, the Nod-like receptors (NLRs) have emerged as key microbial sensors that participate in the global immune responses to pathogens and contribute to the resolution of infections. This growing group of proteins is divided into subfamilies with basis in their different signaling domains. Prominent among them are Nod1, Nod2, Nalp3, Ipaf, and Naip that have been shown to play important roles against intracellular bacteria. Furthermore, mutations in the genes that encode these proteins have been associated with complex inflammatory disorders including Crohn's disease, asthma, familial cold urticaria, Muckle-Wells syndrome, and Blau syndrome. In this review we will present the current knowledge on the role of these proteins in immunity and inflammatory diseases.
Collapse
Affiliation(s)
- Leticia A M Carneiro
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
| | | | | |
Collapse
|
44
|
Okano S, Hurley DJ, Bergh MS, Vandenplas ML, Budsberg SC, Moore JN. Optimization of conditions for in vitro production of radical oxygen species and expression of tissue factor by canine mononuclear cells and granulocytes for use in high-throughput assays. Vet Immunol Immunopathol 2006; 112:234-42. [PMID: 16750570 DOI: 10.1016/j.vetimm.2006.03.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2005] [Revised: 01/23/2006] [Accepted: 03/13/2006] [Indexed: 10/24/2022]
Abstract
The purpose of this study was to optimize conditions for high throughput measurement of radical oxygen species (ROS) production and expression of tissue factor, also termed procoagulant activity, by canine leukocytes. Granulocytes and mononuclear cells were separated by density gradient centrifugation from peripheral blood collected on several occasions from three healthy large breed dogs. To determine optimal conditions for ROS production, granulocytes were incubated for 1 or 3h in PBG (PBS containing 0.5% BSA and 5mM glucose) or RPMI containing 10% fetal bovine serum (FBS); lipopolysaccharide (LPS), zymosan, peptidoglycan (PGN) and phorbol myristate acetate (PMA) were used as stimuli. ROS was assessed by conversion of the nonfluorescent dye dihydrorhodamine 123 to fluorescent rhodamine 123 by radical species released into the media. To identify optimal conditions for expression of tissue factor, mononuclear cells were incubated for 5h in RPMI containing different concentrations of heat-inactivated FBS (HI-FBS), and LPS, zymosan, PGN or PMA as stimuli. Expression of tissue factor was determined using a one-stage recalcification assay performed in an automated nephelometric coagulation analyzer. Neither LPS nor zymosan increased ROS production by granulocytes incubated in PBG media. In contrast, granulocytes incubated in RPMI had dose-dependent increases in ROS production in response to zymosan and PGN. ROS production was significantly increased by incubation with concentrations of LPS of 0.01microg/ml or greater, and by zymosan concentrations of 0.1microg/ml or greater. ROS production in response to incubation with PMA was significantly increased starting at 10(-7)M, and was significantly greater for cells incubated in RPMI than cells incubated in PBG. LPS-, zymosan- and PGN-stimulated procoagulant activity increased in a dose-dependent manner, whereas PMA-stimulated procoagulant activity peaked at 10(-7)M. Increasing concentrations of HI-FBS significantly increased LPS-, zymosan- and PGN-induced procoagulant activity of mononuclear cells. Results obtained in this study indicate production of ROS by canine granulocytes is optimal when these cells are incubated for 3h in RPMI with LPS (0.1microg/ml), zymosan (10 microg/ml), PGN (10 microg/ml), and PMA (10(-7)M). Furthermore, canine mononuclear cells express procoagulant activity in response to LPS, zymosan, PGN, and PMA, and responses to LPS, zymosan and PGN are enhanced by the addition of HI-FBS. These findings suggest that HI-FBS retains important serum proteins that facilitate interactions between each of these bacterial or yeast derived products and the mononuclear cells. Consequently, future studies regarding the regulation of procoagulant activity by canine mononuclear cells should be performed in the presence of HI-FBS. Both assays utilized in this study allow high throughput of samples, and therefore are appropriate choices for rapid screening of conditions and/or therapeutic interventions affecting the canine inflammatory system.
Collapse
Affiliation(s)
- Shozo Okano
- Department of Small Animal Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
| | | | | | | | | | | |
Collapse
|
45
|
Okano S, Hurley DJ, Vandenplas ML, Moore JN. Effect of fetal bovine serum and heat-inactivated fetal bovine serum on microbial cell wall-induced expression of procoagulant activity by equine and canine mononuclear cells in vitro. Am J Vet Res 2006; 67:1020-4. [PMID: 16740096 DOI: 10.2460/ajvr.67.6.1020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine the effect of fetal bovine serum (FBS) and heat-inactivated FBS (HI-FBS) on lipopolysaccharide (LPS)- and zymosan-induced procoagulant activity of equine and canine mononuclear cells. SAMPLE POPULATION Mononuclear cells from 18 horses and 3 dogs. PROCEDURES Cells were incubated with various concentrations of FBS, HI-FBS, LPS, zymosan, polymyxin B, and anti-LPS-binding protein monoclonal antibody or combinations of these constituents. A 1 stage recalcification assay was used to determine procoagulant activity. RESULTS Addition of FBS to media significantly increased procoagulant activity; equine and canine cells were stimulated by 1% and 10% FBS, respectively. Coincubation of cells with FBS and polymyxin B did not reduce this effect, suggesting that the response was not attributable to LPS contamination. Addition of HI-FBS to media did not stimulate procoagulant activity of equine or canine cells, and the sensitivity of the equine cells to LPS was significantly increased by HI-FBS. This increased LPS sensitivity was reduced 40% with monoclonal antibody directed against human recombinant LPS-binding protein. Increasing concentrations of HIFBS significantly increased LPS- and zymosan-induced procoagulant activity of canine cells. CONCLUSION AND CLINICAL RELEVANCE Procoagulant activity production in equine and canine mononuclear cells was significantly increased by addition of FBS, whereas heat inactivation of FBS eliminated this effect. Heat inactivation did not eliminate the function of serum proteins involved in enhancement of LPS and zymosan-induced procoagulant activity. Results suggest that HI-FBS can be used as a source of serum proteins that increase the sensitivity of mononuclear cells to bacterial and yeast cell wall components.
Collapse
Affiliation(s)
- Shozo Okano
- Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori 034-8628, Japan
| | | | | | | |
Collapse
|
46
|
Haller D. Intestinal epithelial cell signalling and host-derived negative regulators under chronic inflammation: to be or not to be activated determines the balance towards commensal bacteria. Neurogastroenterol Motil 2006; 18:184-99. [PMID: 16487409 DOI: 10.1111/j.1365-2982.2006.00762.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Advancing knowledge regarding the cellular mechanisms of intestinal inflammation has led to a better understanding of the disease pathology in patients with chronic disorders of the gut including inflammatory bowel disease, coeliac disease, lymphocytic colitis and irritable bowel syndrome. An emerging new paradigm suggests that changes in the homeostasis of bacteria- and host-derived signal transduction at the epithelial cell level may lead to functional and immune disturbances of the intestinal epithelium. It has become clear from numerous studies that enteric bacteria are a critical component in the development and prevention/treatment of chronic intestinal inflammation. Signal-specific activation of mitogen-activated protein kinases (MAPK), interferon-regulated factors (IRF) and the transcription factor NF-kappaB through pattern recognition receptor signalling effectively induce inflammatory defence mechanisms. Unbalanced activation of these innate signalling pathways because of host genetic predispositions and/or the lack of adequate anti-inflammatory feedback mechanisms may turn a physiological response into a pathological situation including failure of bacterial clearance and development of chronic inflammation. Host-derived regulators from the immune and enteric nerve system crosstalk to the innate signalling network of the intestinal epithelium in order to shape the extent and duration of inflammatory processes.
Collapse
Affiliation(s)
- D Haller
- Technical University of Munich, Else-Kroener-Fresenius Centre for Experimental Nutritional Medicine, Freising-Weihenstephan, Germany.
| |
Collapse
|
47
|
Hamann L, Glaeser C, Hamprecht A, Gross M, Gomma A, Schumann RR. Toll-like receptor (TLR)-9 promotor polymorphisms and atherosclerosis. Clin Chim Acta 2006; 364:303-7. [PMID: 16125159 DOI: 10.1016/j.cca.2005.07.017] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2005] [Revised: 07/25/2005] [Accepted: 07/26/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND Currently, the primary cause of atherosclerosis remains controversial: while oxidized or enzymatically altered LDL is widely accepted as one cause of the inflamed lesion, microorganisms such as C. pneumoniae or cytomegalovirus (CMV) also have recently been postulated to be involved in the pathogenesis of atherosclerosis. Microbial products activate innate immune cells of the host via Toll-like receptors (TLRs). Common polymorphisms of the TLR-2 and TLR-4 genes have been shown to be associated with an increased risk for restenosis after PTCA, and a lower risk of carotid atherosclerosis, respectively. Microbial DNA has been shown to activate immune cells via the cytosolic TLR-9. Specially, C. pneumonia and CMV as intracellular pathogens may be potent trigger of TLR-9 signaling. Therefore, we investigated whether the two common promotor polymorphisms of the TLR-9 gene are correlated with atherogenesis. METHODS The T-1237C and the T-1486C polymorphisms were analyzed by Real Time PCR in 202 (derivation study, age 58.1, SD 10.0) and 182 (validation study, age 59.7, SD 9.6) patients that underwent angioplasty and 188 healthy controls (age 52.5, SD 6.1). Restenosis was defined as >50% luminal diameter reduction at follow-up angiography. RESULTS We found the two polymorphism being able to create new potential binding sites for transcription factors, however, no association of the TLR-9 polymorphisms with atherogenesis or restenosis was detectable. CONCLUSION Our data indicate that the two TLR-9 promotor polymorphisms are not involved in atherogenesis.
Collapse
Affiliation(s)
- Lutz Hamann
- Institute for Microbiology and Hygiene, Charité University Medical Center, Medicine, Dorotheenstrasse 96, 10117 Berlin, Germany.
| | | | | | | | | | | |
Collapse
|
48
|
Schaible UE, Kaufmann SHE. A nutritive view on the host-pathogen interplay. Trends Microbiol 2005; 13:373-80. [PMID: 15993074 DOI: 10.1016/j.tim.2005.06.009] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2005] [Revised: 06/06/2005] [Accepted: 06/20/2005] [Indexed: 01/01/2023]
Abstract
The interaction between pathogenic microbes and their host is determined by survival strategies on both sides, including competition for essential nutrients. During evolution, pathogenic microbes developed ways to access certain nutrients from the host, which, by contrast, can be exploited by the host for defence by restricting the availability of these nutrients. In this article, we review ecological aspects of the host-pathogen relationship and describe examples for competitive nutrient usage. We also discuss the beneficial probiotic microbes of the mammalian gut, which influence their environment including inflammatory host responses, and how they might be supported by prebiotic diets.
Collapse
Affiliation(s)
- Ulrich E Schaible
- Max-Planck-Institute for Infection Biology, Department of Immunology, Schumannstrasse 21-22, D-10117 Berlin, Germany.
| | | |
Collapse
|
49
|
Blüml S, Kirchberger S, Bochkov VN, Krönke G, Stuhlmeier K, Majdic O, Zlabinger GJ, Knapp W, Binder BR, Stöckl J, Leitinger N. Oxidized phospholipids negatively regulate dendritic cell maturation induced by TLRs and CD40. THE JOURNAL OF IMMUNOLOGY 2005; 175:501-8. [PMID: 15972685 DOI: 10.4049/jimmunol.175.1.501] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Maturation of dendritic cells (DCs) induced by pathogen-derived signals via TLRs is a crucial step in the initiation of an adaptive immune response and therefore has to be well controlled. In this study, we demonstrate that oxidized phospholipids (ox-PLs), which are generated during infections, apoptosis, and tissue damage, interfere with DC activation, preventing their maturation. ox-PLs blocked TLR-3- and TLR-4-mediated induction of the costimulatory molecules CD40, CD80, CD83, and CD86, the cytokines IL-12 and TNF, as well as lymphocyte stimulatory capacity. CD40 and TLR-2-mediated cytokine production was also inhibited, whereas up-regulation of costimulatory molecules via these receptors was not affected by ox-PLs. Thus, formation of ox-PLs during the course of an inflammatory response may represent a negative-feedback loop preventing excessive and sustained immune reactions through regulating DC maturation.
Collapse
Affiliation(s)
- Stefan Blüml
- Institute of Immunology, Medical University of Vienna, Medical University of Vienna, Vienna, Austria
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Murray PJ. NOD proteins: an intracellular pathogen-recognition system or signal transduction modifiers? Curr Opin Immunol 2005; 17:352-8. [PMID: 15950446 DOI: 10.1016/j.coi.2005.05.006] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2005] [Accepted: 05/27/2005] [Indexed: 12/30/2022]
Abstract
NOD1 and NOD2 are members of a diverse family of cytoplasmic proteins that contain C-terminal leucine-rich repeats. Because of their similarity to a family of plant proteins involved in pathogen resistance, and because mutations in Card15, encoding NOD2, are frequently found in familial cases of Crohn's disease--an intestinal malady of excessive inflammation--NOD proteins have been proposed to fulfill a role in the intracellular sensing of bacteria. Indeed, NOD proteins seem to alter the ability of cells to respond to fragments from bacterial cell walls. This system could function analogously to the Toll-like receptors--extracellular proteins that play an essential role in pathogen recognition. However, the idea of an intracellular system that specifically recognizes bacterial cell components is controversial and alternative functions of NODs are possible including regulating signal transduction systems.
Collapse
Affiliation(s)
- Peter J Murray
- Department of Infectious Diseases, St. Jude Children's Research Hospital, 332 North Lauderdale, Memphis, TN 38105, USA.
| |
Collapse
|