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Budama-Kilinc Y, Gok B, Cetin Aluc C, Kecel-Gunduz S. In vitro and in silico evaluation of the design of nano-phyto-drug candidate for oral use against Staphylococcus aureus. PeerJ 2023; 11:e15523. [PMID: 37309371 PMCID: PMC10257901 DOI: 10.7717/peerj.15523] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 05/17/2023] [Indexed: 06/14/2023] Open
Abstract
Onopordum acanthium is a medicinal plant with many important properties, such as antibacterial, anticancer, and anti-hypotensive properties. Although various studies reported the biological activities of O. acanthium, there is no study on its nano-phyto-drug formulation. The aim of this study is to develop a candidate nano-drug based on phytotherapeutic constituents and evaluate its efficiency in vitro and in silico. In this context, poly (lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) of O. acanthium extract (OAE) were synthesized and characterized. It was determined that the average particle size of OAE-PLGA-NPs was 214.9 ± 6.77 nm, and the zeta potential was -8.03 ± 0.85 mV, and PdI value was 0.064 ± 0.013. The encapsulation efficiency of OAE-PLGA-NPs was calculated as 91%, and the loading capacity as 75.83%. The in vitro drug release study showed that OAE was released from the PLGA NPs with 99.39% over the 6 days. Furthermore, the mutagenic and cytotoxic activity of free OAE and OAE-PLGA-NPs were evaluated by the Ames test and MTT test, respectively. Although 0.75 and 0.37 mg/mL free OAE concentrations caused both frameshift mutation and base pair substitution (p < 0.05), the administered OAE-PLGA NP concentrations were not mutagenic. It was determined with the MTT analysis that the doses of 0.75 and 1.5 mg/mL of free OAE had a cytotoxic effect on the L929 fibroblast cell line (p < 0.05), and OAE-PLGA-NPs had no cytotoxic effect. Moreover, the interaction between the OAE and S. aureus was also investigated using the molecular docking analysis method. The molecular docking and molecular dynamics (MD) results were implemented to elucidate the S. aureus MurE inhibition potential of OAE. It was shown that quercetin in the OAE content interacted significantly with the substantial residues in the catalytic pocket of the S. aureus MurE enzyme, and quercetin performed four hydrogen bond interactions corresponding to a low binding energy of -6.77 kcal/mol with catalytic pocket binding residues, which are crucial for the inhibition mechanism of S. aureus MurE. Finally, the bacterial inhibition values of free OAE and OAE-PLGA NPs were determined against S. aureus using a microdilution method. The antibacterial results showed that the inhibition value of the OAE-PLGA NPs was 69%. In conclusion, from the in vitro and in silico results of the nano-sized OAE-PLGA NP formulation produced in this study, it was evaluated that the formulation may be recommended as a safe and effective nano-phyto-drug candidate against S. aureus.
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Affiliation(s)
- Yasemin Budama-Kilinc
- Bioengineering Department, Yildiz Technical University, Istanbul, Turkey
- Health Biotechnology Joint Research and Application Center of Excellence, Istanbul, Turkey
| | - Bahar Gok
- Graduate School of Natural and Applied Science, Yildiz Technical University, Istanbul, Turkey
| | - Cigdem Cetin Aluc
- Graduate School of Natural and Applied Science, Yildiz Technical University, Istanbul, Turkey
- Abdi Ibrahim Production Facilities, Abdi Ibrahim Pharmaceuticals, Istanbul, Turkey
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Kong LX, Wang Z, Shou YK, Zhou XD, Zong YW, Tong T, Liao M, Han Q, Li Y, Cheng L, Ren B. The FnBPA from methicillin-resistant Staphylococcus aureus promoted development of oral squamous cell carcinoma. J Oral Microbiol 2022; 14:2098644. [PMID: 35859766 PMCID: PMC9291692 DOI: 10.1080/20002297.2022.2098644] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Background Oral squamous cell carcinoma (OSCC) is the most common tumor in the oral cavity. Methicillin-resistant Staphylococcus aureus (MRSA) were highly detected in OSCC patients; however, the interactions and mechanisms between drug-resistant bacteria (MRSA) and OSCC are not clear. Aim The aim of this study was to investigate the promotion of MRSA on the development of OSCC. Methods MRSA and MSSA (methicillin-susceptible) strains were employed to investigate the effect on the proliferation of OSCC in vitro and vivo. Results All of the MRSA strains significantly increased the proliferation of OSCC cells and MRSA arrested the cell cycles of OSCC cells in the S phase. MRSA activated the expression of TLR-4, NF-κB and c-fos in OSCC cells. MRSA also promoted the development of squamous cell carcinoma in vivo. The virulence factor fnbpA gene was significantly upregulated in all MRSA strains. By neutralizing FnBPA, the promotions of MRSA on OSCC cell proliferation and development of squamous cell carcinoma were significantly decreased. Meanwhile, the activation of c-fos and NF-κB by MRSA was also significantly decreased by FnBPA antibody. Conclusion MRSA promoted development of OSCC, and the FnBPA protein was the critical virulence factor. Targeting virulence factors is a new method to block the interaction between a drug-resistant pathogen and development of tumors.
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Affiliation(s)
- Li-Xin Kong
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Zheng Wang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Yu-Ke Shou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Xue-Dong Zhou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Ya-Wen Zong
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Ting Tong
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Min Liao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Qi Han
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Yan Li
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Lei Cheng
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- Department of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Biao Ren
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
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El-Dershaby NH, El-Hawash SA, Kassab SE, Dabees HG, Abdel Moneim AE, Abdel Wahab IA, Abd-Alhaseeb MM, El-Miligy MMM. Rational design of biodegradable sulphonamide candidates treating septicaemia by synergistic dual inhibition of COX-2/PGE2 axis and DHPS enzyme. J Enzyme Inhib Med Chem 2022; 37:1737-1751. [PMID: 35707920 PMCID: PMC9225712 DOI: 10.1080/14756366.2022.2086868] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
A new series of co-drugs was designed based on hybridising the dihydropteroate synthase (DHPS) inhibitor sulphonamide scaffold with the COX-2 inhibitor salicylamide pharmacophore through biodegradable linkage to achieve compounds with synergistic dual inhibition of COX-2/PGE2 axis and DHPS enzyme to enhance antibacterial activity for treatment of septicaemia. Compounds 5 b, 5j, 5n and 5o demonstrated potent in vitro COX-2 inhibitory activity comparable to celecoxib. 5j and 5o exhibited ED50 lower than celecoxib in carrageenan-induced paw edoema test with % PGE2 inhibition higher than celecoxib. Furthermore, 5 b, 5j and 5n showed gastric safety profile like celecoxib. Moreover, in vivo antibacterial screening revealed that, 5j showed activity against S.aureus and E.coli higher than sulfasalazine. While, 5o revealed activity against E.coli higher than sulfasalazine and against S.aureus comparable to sulfasalazine. Compound 5j achieved the target goal as potent inhibitor of COX-2/PGE2 axis and in vivo broad-spectrum antibacterial activity against induced septicaemia in mice.
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Affiliation(s)
- Nada H El-Dershaby
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Damanhour University, Damanhour, Egypt
| | - Soad A El-Hawash
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
| | - Shaymaa E Kassab
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Damanhour University, Damanhour, Egypt.,Department of organic and Medicinal Chemistry, Faculty of Pharmacy, University of Sadat City, Menoufia,Egypt
| | - Hoda G Dabees
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Damanhour University, Damanhour, Egypt
| | - Ahmed E Abdel Moneim
- Department of Zoology and Entomology, Faculty of Science, Helwan University, Cairo, Egypt
| | - Ibrahim A Abdel Wahab
- Microbiology and Immunology Department, Faculty of Pharmacy, Pharos University in Alexandria, Alexandria, Egypt
| | - Mohammad M Abd-Alhaseeb
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Damanhur University, Damanhour, Egypt
| | - Mostafa M M El-Miligy
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
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Miek L, Jordan PM, Günther K, Pace S, Beyer T, Kowalak D, Hoerr V, Löffler B, Tuchscherr L, Serhan CN, Gerstmeier J, Werz O. Staphylococcus aureus controls eicosanoid and specialized pro-resolving mediator production via lipoteichoic acid. Immunology 2022; 166:47-67. [PMID: 35143048 PMCID: PMC9426618 DOI: 10.1111/imm.13449] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 01/18/2022] [Accepted: 01/19/2022] [Indexed: 01/07/2023] Open
Abstract
Staphylococcus aureus causes severe infections associated with inflammation, such as sepsis or osteomyelitis. Inflammatory processes are regulated by distinct lipid mediators (LMs) but how their biosynthetic pathways are orchestrated in S. aureus infections is elusive. We show that S. aureus strikingly not only modulates pro-inflammatory, but also inflammation-resolving LM pathways in murine osteomyelitis and osteoclasts as well as in human monocyte-derived macrophages (MDMs) with different phenotype. Targeted LM metabololipidomics using ultra-performance liquid chromatography-tandem mass spectrometry revealed massive generation of LM with distinct LM signature profiles in acute and chronic phases of S. aureus-induced murine osteomyelitis in vivo. In human MDM, S. aureus elevated cyclooxygenase-2 (COX-2) and microsomal prostaglandin E2 synthase-1 (mPGES-1), but impaired the levels of 15-lipoxygenase-1 (15-LOX-1), with respective changes in LM signature profiles initiated by these enzymes, that is, elevated PGE2 and impaired specialized pro-resolving mediators, along with reduced M2-like phenotypic macrophage markers. The cell wall component, lipoteichoic acid (LTA), mimicked the impact of S. aureus elevating COX-2/mPGES-1 expression via NF-κB and p38 MAPK signalling in MDM, while the impairment of 15-LOX-1 correlates with reduced expression of Lamtor1. In conclusion, S. aureus dictates LM pathways via LTA resulting in a shift from anti-inflammatory M2-like towards pro-inflammatory M1-like LM signature profiles.
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Affiliation(s)
- Laura Miek
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
| | - Paul M. Jordan
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
| | - Kerstin Günther
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
| | - Simona Pace
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
| | - Timo Beyer
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
| | - David Kowalak
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
| | - Verena Hoerr
- Institute of Medical MicrobiologyJena University HospitalJenaGermany
| | - Bettina Löffler
- Institute of Medical MicrobiologyJena University HospitalJenaGermany
| | - Lorena Tuchscherr
- Institute of Medical MicrobiologyJena University HospitalJenaGermany
| | - Charles N. Serhan
- Department of Anesthesiology, Perioperative and Pain MedicineHarvard Medical SchoolCenter for Experimental Therapeutics and Reperfusion InjuryBrigham and Women’s HospitalBostonMassachusettsUSA
| | - Jana Gerstmeier
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
| | - Oliver Werz
- Department of Pharmaceutical/Medicinal ChemistryInstitute of PharmacyFriedrich‐Schiller‐University JenaJenaGermany
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Dong J, Li W, Wang Q, Chen J, Zu Y, Zhou X, Guo Q. Relationships Between Oral Microecosystem and Respiratory Diseases. Front Mol Biosci 2022; 8:718222. [PMID: 35071321 PMCID: PMC8767498 DOI: 10.3389/fmolb.2021.718222] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 12/09/2021] [Indexed: 02/05/2023] Open
Abstract
Oral microecosystem is a very complicated ecosystem that is located in the mouth and comprises oral microbiome, diverse anatomic structures of oral cavity, saliva and interactions between oral microbiota and between oral microbiota and the host. More and more evidence from studies of epidemiology, microbiology and molecular biology is establishing a significant link between oral microecosystem and respiratory diseases. Microbiota settling down in oral microecosystem is known as the main source of lung microbiome and has been associated with the occurrence and development of respiratory diseases like pneumonia, chronic obstructive pulmonary disease, lung cancer, cystic fibrosis lung disease and asthma. In fact, it is not only indigenous oral microbes promote or directly cause respiratory infection and inflammation when inhaled into the lower respiratory tract, but also internal environment of oral microecosystem serves as a reservoir for opportunistic respiratory pathogens. Moreover, poor oral health and oral diseases caused by oral microecological dysbiosis (especially periodontal disease) are related with risk of multiple respiratory diseases. Here, we review the research status on the respiratory diseases related with oral microecosystem. Potential mechanisms on how respiratory pathogens colonize oral microecosystem and the role of indigenous oral microbes in pathogenesis of respiratory diseases are also summarized and analyzed. Given the importance of oral plaque control and oral health interventions in controlling or preventing respiratory infection and diseases, we also summarize the oral health management measures and attentions, not only for populations susceptible to respiratory infection like the elderly and hospitalized patients, but also for dentist or oral hygienists who undertake oral health care. In conclusion, the relationship between respiratory diseases and oral microecosystem has been established and supported by growing body of literature. However, etiological evidence on the role of oral microecosystem in the development of respiratory diseases is still insufficient. Further detailed studies focusing on specific mechanisms on how oral microecosystem participate in the pathogenesis of respiratory diseases could be helpful to prevent and treat respiratory diseases.
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Affiliation(s)
- Jiajia Dong
- Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Wei Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Qi Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Jiahao Chen
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yue Zu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Qiang Guo
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Live S. aureus and heat-killed S. aureus induce different inflammation-associated factors in bovine endometrial tissue in vitro. Mol Immunol 2021; 139:123-130. [PMID: 34481270 DOI: 10.1016/j.molimm.2021.07.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 04/27/2021] [Accepted: 07/17/2021] [Indexed: 11/21/2022]
Abstract
Staphylococcus aureus is majorly involved in bovine mastitis; however, it weakly induces pro-inflammatory factors in mammary gland epithelial cells. We aimed to clarify the involvement of S. aureus in other inflammation types and its relationship with inflammatory factor secretion in bovine endometritis. We used live S. aureus (LSA)- and heat-killed S. aureus (HK-SA)-treated bovine endometrial tissue in vitro. The HK-SA-treated group showed significantly higher IL-6, IL-1β, TNF-α, CXCL1/2 and TLR2 expression than the LSA-infected group. Contrastingly, the LSA-infected group showed significantly higher PTGS2, mPGES-1, and EP4 expression than the HK-SA treated group. There was no significant between-group difference in hyaluronan-binding protein 1 expression, which suggested similar inflammatory responses. H&E results indicated that LSA and HK-SA induced shedding of endometrial gland epithelial cells. The LSA-infected group showed higher high-mobility group box 1 protein expression than the HK-SA treated groups, which indicated differences in signaling pathway activation. Further, the LSA-treated group had higher JNK and p38 MAPK levels while the HK-SA-treated group had higher IκB-α levels. There was no significant between-group difference in the ERK signaling pathway. Our findings indicate that the pathogen-associated molecular patterns (PAMPs) of S. aureus activate pro-inflammatory factor expression via the TLR2-ERK-NF-κB signaling pathway. Contrastingly, LSA induced PGE2 accumulation via the TLR2/MAPKs signaling pathway. This is the first report that S. aureus and the PAMPs of S. aureus activate different signaling pathways and that LSA mainly induce PGE2 accumulation rather than cytokine secretion.
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Sheppe AEF, Santelices J, Czyz DM, Edelmann MJ. Yersinia pseudotuberculosis YopJ Limits Macrophage Response by Downregulating COX-2-Mediated Biosynthesis of PGE2 in a MAPK/ERK-Dependent Manner. Microbiol Spectr 2021; 9:e0049621. [PMID: 34319170 PMCID: PMC8552654 DOI: 10.1128/spectrum.00496-21] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 06/22/2021] [Indexed: 12/23/2022] Open
Abstract
Prostaglandin E2 (PGE2) is an essential immunomodulatory lipid released by cells in response to infection with many bacteria, yet its function in macrophage-mediated bacterial clearance is poorly understood. Yersinia overall inhibits the inflammatory circuit, but its effect on PGE2 production is unknown. We hypothesized that one of the Yersinia effector proteins is responsible for the inhibition of PGE2 biosynthesis. We identified that yopB-deficient Y. enterocolitica and Y. pseudotuberculosis deficient in the secretion of virulence proteins via a type 3 secretion system (T3SS) failed to inhibit PGE2 biosynthesis in macrophages. Consistently, COX-2-mediated PGE2 biosynthesis is upregulated in cells treated with heat-killed or T3SS-deficient Y. pseudotuberculosis but diminished in the presence of a MAPK/ERK inhibitor. Mutants expressing catalytically inactive YopJ induce similar levels of PGE2 as heat-killed or ΔyopB Y. pseudotuberculosis, reversed by YopJ complementation. Shotgun proteomics discovered host pathways regulated in a YopJ-mediated manner, including pathways regulating PGE2 synthesis and oxidative phosphorylation. Consequently, this study identified that YopJ-mediated inhibition of MAPK signal transduction serves as a mechanism targeting PGE2, an alternative means of inflammasome inhibition by Yersinia. Finally, we showed that EP4 signaling supports macrophage function in clearing intracellular bacteria. In summary, our unique contribution was to determine a bacterial virulence factor that targets COX-2 transcription, thereby enhancing the intracellular survival of yersiniae. Future studies should investigate whether PGE2 or its stable synthetic derivatives could serve as a potential therapeutic molecule to improve the outcomes of specific bacterial infections. Since other pathogens encode YopJ homologs, this mechanism is expected to be present in other infections. IMPORTANCE PGE2 is a critical immunomodulatory lipid, but its role in bacterial infection and pathogen clearance is poorly understood. We previously demonstrated that PGE2 leads to macrophage polarization toward the M1 phenotype and stimulates inflammasome activation in infected macrophages. Finally, we also discovered that PGE2 improved the clearance of Y. enterocolitica. The fact that Y. enterocolitica hampers PGE2 secretion in a type 3 secretion system (T3SS)-dependent manner and because PGE2 appears to assist macrophage in the clearance of this bacterium indicates that targeting of the eicosanoid pathway by Yersinia might be an adaption used to counteract host defenses. Our study identified a mechanism used by Yersinia that obstructs PGE2 biosynthesis in human macrophages. We showed that Y. pseudotuberculosis interferes with PGE2 biosynthesis by using one of its T3SS effectors, YopJ. Specifically, YopJ targets the host COX-2 enzyme responsible for PGE2 biosynthesis, which happens in a MAPK/ER-dependent manner. Moreover, in a shotgun proteomics study, we also discovered other pathways that catalytically active YopJ targets in the infected macrophages. YopJ was revealed to play a role in limiting host LPS responses, including repression of EGR1 and JUN proteins, which control transcriptional activation of proinflammatory cytokine production such as interleukin-1β. Since YopJ has homologs in other bacterial species, there are likely other pathogens that target and inhibit PGE2 biosynthesis. In summary, our study's unique contribution was to determine a bacterial virulence factor that targets COX-2 transcription. Future studies should investigate whether PGE2 or its stable synthetic derivatives could serve as a potential therapeutic target.
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Affiliation(s)
- Austin E. F. Sheppe
- Department of Microbiology and Cell Science, College of Agricultural and Life Sciences, University of Florida, Gainesville, Florida, USA
| | - John Santelices
- Department of Microbiology and Cell Science, College of Agricultural and Life Sciences, University of Florida, Gainesville, Florida, USA
| | - Daniel M. Czyz
- Department of Microbiology and Cell Science, College of Agricultural and Life Sciences, University of Florida, Gainesville, Florida, USA
| | - Mariola J. Edelmann
- Department of Microbiology and Cell Science, College of Agricultural and Life Sciences, University of Florida, Gainesville, Florida, USA
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Kang E, Park JE, Seo Y, Han JS. ( E)-5-hydroxy-7-methoxy-3-(2'-hydroxybenzyl)-4-chromanone isolated from Portulaca oleracea L. suppresses LPS-induced inflammation in RAW 264.7 macrophages by downregulating inflammatory factors. Immunopharmacol Immunotoxicol 2021; 43:611-621. [PMID: 34388059 DOI: 10.1080/08923973.2021.1963271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
CONTEXT Portulaca oleracea L. is herbaceous succulent annual plant, which belongs to the Portulacaceae family. Many studies have shown its wide spectrum of pharmacological activities such as anti-cancer and anti-diabetic effects. OBJECTIVES The objective of this study was to identify the anti-inflammatory effects of HM-chromanone isolated from Portulaca oleracea L. in LPS-stimulated RAW 264.7 macrophages. MATERIALS AND METHODS LPS (1 μg/ml)-stimulated mouse RAW 264.7 macrophages were used to assess the anti-inflammatory effect of HM-chromanone (10-50 μM). Cell viability was evaluated by MTT assay. In addition, the production of intracellular ROS, superoxide anion, lipid peroxide, NO, and PGE2, and activity of antioxidant enzymes were analyzed. The expressions of iNOS, COX-2, IκB, NF-κB, TNF-α, IL-1β and IL-6 were evaluated by western blot analysis. RESULTS HM-chromanone has demonstrated that there is no significant cytotoxic effect on the viability of RAW 264.7 macrophages. In LPS-stimulated RAW 264.7 cells, HM-chromanone treatment was found to significantly inhibit the production of intracellular ROS, superoxide anion and lipid peroxide, while enhancing the activity of antioxidant enzymes such as SOD, catalase, and GSH-px. Additionally, HM-chromanone treatment was observed to inhibit NO and PGE2 production by inhibiting the expression of iNOS and COX-2. Subsequently, HM-chromanone was observed to significantly suppress LPS-induced expression of IκB, NF-κB, TNF-α, IL-1β and IL-6. DISCUSSION AND CONCLUSION Overall, our results suggested that HM-chromanone suppresses LPS-induced inflammation in RAW 264.7 macrophages by downregulating the expression of inflammatory factors.
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Affiliation(s)
- Eunji Kang
- Department of Food Science and Nutrition, Pusan National University, Busan, Republic of Korea
| | - Jae Eun Park
- Department of Food Science and Nutrition, Pusan National University, Busan, Republic of Korea
| | - Youngwan Seo
- Division of Marine Bioscience, Korea Maritime and Ocean University, Busan, Republic of Korea
| | - Ji Sook Han
- Department of Food Science and Nutrition, Pusan National University, Busan, Republic of Korea
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Roles of Eicosanoids in Regulating Inflammation and Neutrophil Migration as an Innate Host Response to Bacterial Infections. Infect Immun 2021; 89:e0009521. [PMID: 34031130 DOI: 10.1128/iai.00095-21] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Eicosanoids are lipid-based signaling molecules that play a unique role in innate immune responses. The multiple types of eicosanoids, such as prostaglandins (PGs) and leukotrienes (LTs), allow the innate immune cells to respond rapidly to bacterial invaders. Bacterial pathogens alter cyclooxygenase (COX)-derived prostaglandins (PGs) in macrophages, such as PGE2 15d-PGJ2, and lipoxygenase (LOX)-derived leukotriene LTB4, which has chemotactic functions. The PG synthesis and secretion are regulated by substrate availability of arachidonic acid and by the COX-2 enzyme, and the expression of this protein is regulated at multiple levels, both transcriptionally and posttranscriptionally. Bacterial pathogens use virulence strategies such as type three secretion systems (T3SSs) to deliver virulence factors altering the expression of eicosanoid-specific biosynthetic enzymes, thereby modulating the host response to bacterial lipopolysaccharides (LPS). Recent advances have identified a novel role of eicosanoids in inflammasome activation during intracellular infection with bacterial pathogens. Specifically, PGE2 was found to enhance inflammasome activation, driving the formation of pore-induced intracellular traps (PITs), thus trapping bacteria from escaping the dying cell. Finally, eicosanoids and IL-1β released from macrophages are implicated in the efferocytosis of neighboring neutrophils. Neutrophils play an essential role in phagocytosing and degrading PITs and associated bacteria to restore homeostasis. This review focuses on the novel functions of host-derived eicosanoids in the host-pathogen interactions.
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Liu K, Mao W, Liu B, Li T, Wang X, Pei L, Cao J, Wang F. Prostaglandin E2 promotes Staphylococcus aureus infection via EP4 receptor in bovine endometrium. Microb Pathog 2021; 158:105019. [PMID: 34107344 DOI: 10.1016/j.micpath.2021.105019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 05/24/2021] [Accepted: 05/25/2021] [Indexed: 10/21/2022]
Abstract
Prostaglandin E2 (PGE2) enhances Staphylococcus aureus infection but its mechanism is not well understood. Here, we examined the effect of PGE2 on Staphylococcal Protein A (SPA) expression in bovine endometrium and determined the role of select PGE2 receptors (i.e., EP2 and EP4) in adhesion and internalization of S. aureus. S. aureus isolate SA113 was used for in vitro infection of bovine endometrial tissues and epithelial cells, with treatment conditions consisting of untreated control, SA113 treatment, SA113 + PGE2, SA113 + PGE2 + EP2 receptor antagonist (AH-6809), and SA113 + PGE2 + EP4 receptor antagonist (AH-23848). Immunofluorescence assay revealed that PGE2 could promote SPA expression in S. aureus-infected bovine endometrial tissues. PGE2 also enhanced the adhesion and internalization of S. aureus in bovine endometrial cells. The addition of EP4 antagonist, but not the EP2 antagonist, abrogated the ability of PGE2 to promote S. aureus SPA expression, adhesion, and internalization in endometrial cells. Our findings suggest that S. aureus infection in the endometrium is enhanced by PGE2 through the EP4 receptor. This result is essential for the development of new approach to treating S. aureus infection, such as the application of EP4 antagonist as an adjunct drug treatment.
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Affiliation(s)
- Kun Liu
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, Inner Mongolia Agricultural University, 010018, Hohhot, China; Key Laboratory of Clinical Diagnosis and Treatment Techniques for Anima Disease, Ministry of Agriculture, Hohhot, China; Laboratory of Veterinary Pathology, College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China.
| | - Wei Mao
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, Inner Mongolia Agricultural University, 010018, Hohhot, China; Key Laboratory of Clinical Diagnosis and Treatment Techniques for Anima Disease, Ministry of Agriculture, Hohhot, China.
| | - Bo Liu
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, Inner Mongolia Agricultural University, 010018, Hohhot, China; Key Laboratory of Clinical Diagnosis and Treatment Techniques for Anima Disease, Ministry of Agriculture, Hohhot, China.
| | - Tingting Li
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, Inner Mongolia Agricultural University, 010018, Hohhot, China; Key Laboratory of Clinical Diagnosis and Treatment Techniques for Anima Disease, Ministry of Agriculture, Hohhot, China.
| | - Xinfei Wang
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, Inner Mongolia Agricultural University, 010018, Hohhot, China; Key Laboratory of Clinical Diagnosis and Treatment Techniques for Anima Disease, Ministry of Agriculture, Hohhot, China.
| | - Le Pei
- Veterinary Research Institute, Inner Mongolia Academy of Agriculture and Animal Husbandry Sciences, Hohhot, China.
| | - Jinshan Cao
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, Inner Mongolia Agricultural University, 010018, Hohhot, China; Key Laboratory of Clinical Diagnosis and Treatment Techniques for Anima Disease, Ministry of Agriculture, Hohhot, China.
| | - Fenglong Wang
- Laboratory of Veterinary Pathology, College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China.
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11
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Motaung TE, Peremore C, Wingfield B, Steenkamp E. Plant-associated fungal biofilms-knowns and unknowns. FEMS Microbiol Ecol 2021; 96:5956487. [PMID: 33150944 DOI: 10.1093/femsec/fiaa224] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 11/03/2020] [Indexed: 02/07/2023] Open
Abstract
Nearly all microbes, including fungi, grow firmly attached to surfaces as a biofilm. Yet, attention toward fungal interactions with plants and the environment is dedicated to free-floating (planktonic) cells. Fungal biofilms are generally thought to configure interactions across and among plant populations. Despite this, plant fungal biofilm research lags far behind the research on biofilms of medically important fungi. The deficit in noticing and exploring this research avenue could limit disease management and plant improvement programs. Here, we provide the current state of knowledge of fungal biofilms and the different pivotal ecological roles they impart in the context of disease, through leveraging evidence across medically important fungi, secondary metabolite production, plant beneficial functions and climate change. We also provide views on several important information gaps potentially hampering plant fungal biofilm research, and propose a way forward to address these gaps.
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Affiliation(s)
- Thabiso E Motaung
- University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Chizné Peremore
- University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Brenda Wingfield
- University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Emma Steenkamp
- University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
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12
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Cieśluk M, Deptuła P, Piktel E, Fiedoruk K, Suprewicz Ł, Paprocka P, Kot P, Pogoda K, Bucki R. Physics Comes to the Aid of Medicine-Clinically-Relevant Microorganisms through the Eyes of Atomic Force Microscope. Pathogens 2020; 9:pathogens9110969. [PMID: 33233696 PMCID: PMC7699805 DOI: 10.3390/pathogens9110969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 11/16/2020] [Accepted: 11/18/2020] [Indexed: 12/01/2022] Open
Abstract
Despite the hope that was raised with the implementation of antibiotics to the treatment of infections in medical practice, the initial enthusiasm has substantially faded due to increasing drug resistance in pathogenic microorganisms. Therefore, there is a need for novel analytical and diagnostic methods in order to extend our knowledge regarding the mode of action of the conventional and novel antimicrobial agents from a perspective of single microbial cells as well as their communities growing in infected sites, i.e., biofilms. In recent years, atomic force microscopy (AFM) has been mostly used to study different aspects of the pathophysiology of noninfectious conditions with attempts to characterize morphological and rheological properties of tissues, individual mammalian cells as well as their organelles and extracellular matrix, and cells’ mechanical changes upon exposure to different stimuli. At the same time, an ever-growing number of studies have demonstrated AFM as a valuable approach in studying microorganisms in regard to changes in their morphology and nanomechanical properties, e.g., stiffness in response to antimicrobial treatment or interaction with a substrate as well as the mechanisms behind their virulence. This review summarizes recent developments and the authors’ point of view on AFM-based evaluation of microorganisms’ response to applied antimicrobial treatment within a group of selected bacteria, fungi, and viruses. The AFM potential in development of modern diagnostic and therapeutic methods for combating of infections caused by drug-resistant bacterial strains is also discussed.
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Affiliation(s)
- Mateusz Cieśluk
- Department of Medical Microbiology and Nanobiomedical Engineering, Medical University of Bialystok, PL-15222 Bialystok, Poland; (M.C.); (P.D.); (E.P.); (K.F.); (Ł.S.)
| | - Piotr Deptuła
- Department of Medical Microbiology and Nanobiomedical Engineering, Medical University of Bialystok, PL-15222 Bialystok, Poland; (M.C.); (P.D.); (E.P.); (K.F.); (Ł.S.)
| | - Ewelina Piktel
- Department of Medical Microbiology and Nanobiomedical Engineering, Medical University of Bialystok, PL-15222 Bialystok, Poland; (M.C.); (P.D.); (E.P.); (K.F.); (Ł.S.)
| | - Krzysztof Fiedoruk
- Department of Medical Microbiology and Nanobiomedical Engineering, Medical University of Bialystok, PL-15222 Bialystok, Poland; (M.C.); (P.D.); (E.P.); (K.F.); (Ł.S.)
| | - Łukasz Suprewicz
- Department of Medical Microbiology and Nanobiomedical Engineering, Medical University of Bialystok, PL-15222 Bialystok, Poland; (M.C.); (P.D.); (E.P.); (K.F.); (Ł.S.)
| | - Paulina Paprocka
- Department of Microbiology and Immunology, Institute of Medical Science, Collegium Medicum, Jan Kochanowski University in Kielce, PL-25317 Kielce, Poland; (P.P.); (P.K.)
| | - Patrycja Kot
- Department of Microbiology and Immunology, Institute of Medical Science, Collegium Medicum, Jan Kochanowski University in Kielce, PL-25317 Kielce, Poland; (P.P.); (P.K.)
| | - Katarzyna Pogoda
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland;
| | - Robert Bucki
- Department of Medical Microbiology and Nanobiomedical Engineering, Medical University of Bialystok, PL-15222 Bialystok, Poland; (M.C.); (P.D.); (E.P.); (K.F.); (Ł.S.)
- Correspondence:
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13
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Jia G, Liu X, Che N, Xia Y, Wang G, Xiong Z, Zhang H, Ai L. Human-origin Lactobacillus salivarius AR809 protects against immunosuppression in S. aureus-induced pharyngitis via Akt-mediated NF-κB and autophagy signaling pathways. Food Funct 2020; 11:270-284. [PMID: 31957758 DOI: 10.1039/c9fo02476j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Lactobacillus salivarius AR809 is a newly discovered probiotic strain from a healthy human pharynx and has potential ability to adhere to the pharyngeal epithelium and inhibit Staphylococcus aureus (S. aureus)-induced inflammatory response. Pharyngeal spray administration of AR809 exhibited protective effects in a S. aureus-induced mouse model of pharyngitis. The inhibitory effect and underlying molecular mechanism of AR809 on S. aureus-stimulated pharyngitis were further investigated. AR809 significantly increased phagocytosis and bactericidal activity, reduced the production of inflammatory mediators (intracellular reactive oxygen species (ROS), prostaglandin E2 (PGE2), cyclooxygenase-2 (COX-2), nitric oxide (NO), inducible NOS (iNOS)) and the expression of inflammatory cytokines (tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β)), and induced macrophages to adopt the M2 phenotype. AR809 also attenuated S. aureus-induced phosphorylations of protein kinase B (Akt) and rapamycin (mTOR), and elevated the autophagic protein (light chain 3 from II (LC3-II) and Beclin-1) level. Furthermore, AR809 inhibited nuclear transcription factor kappa-B (NF-κB) activation by suppressing the nuclear translocation of NF-κB p65. Likewise, 740Y-P (a PI3K activator) decreased the anti-inflammatory effect of AR809 against S. aureus-induced inflammatory response, while AR809 treatments with wortmannin (a PI3K inhibitor) markedly reversed this inflammatory response. AR809 prevents S. aureus-induced pharyngeal inflammatory response, possibly by regulating TLR/PI3K/Akt/mTOR signalling pathway-related autophagy and TLR/PI3K/Akt/IκB/NF-κB pathway activity, and therefore has potential for use in preventing pharyngitis and other inflammatory diseases.
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Affiliation(s)
- Guochao Jia
- Shanghai Engineering Research Center of Food Microbiology, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
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14
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Li Q, Hu Y, Zhou X, Liu S, Han Q, Cheng L. Role of Oral Bacteria in the Development of Oral Squamous Cell Carcinoma. Cancers (Basel) 2020; 12:cancers12102797. [PMID: 33003438 PMCID: PMC7600411 DOI: 10.3390/cancers12102797] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/17/2020] [Accepted: 09/24/2020] [Indexed: 12/13/2022] Open
Abstract
Oral squamous cell carcinoma (OSCC) is an invasive epithelial neoplasm that is influenced by various risk factors, with a low survival rate and an increasing death rate. In the past few years, with the verification of the close relationship between different types of cancers and the microbiome, research has focused on the compositional changes of oral bacteria and their role in OSCC. Generally, oral bacteria can participate in OSCC development by promoting cell proliferation and angiogenesis, influencing normal apoptosis, facilitating invasion and metastasis, and assisting cancer stem cells. The study findings on the association between oral bacteria and OSCC may provide new insight into methods for early diagnosis and treatment development.
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Affiliation(s)
| | | | | | | | - Qi Han
- Correspondence: (Q.H.); (L.C.)
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15
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Staphylococcus aureus Fibronectin Binding Protein A Mediates Biofilm Development and Infection. Infect Immun 2020; 88:IAI.00859-19. [PMID: 32041788 DOI: 10.1128/iai.00859-19] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 02/05/2020] [Indexed: 02/07/2023] Open
Abstract
Implanted medical device-associated infections pose significant health risks, as they are often the result of bacterial biofilm formation. Staphylococcus aureus is a leading cause of biofilm-associated infections which persist due to mechanisms of device surface adhesion, biofilm accumulation, and reprogramming of host innate immune responses. We found that the S. aureus fibronectin binding protein A (FnBPA) is required for normal biofilm development in mammalian serum and that the SaeRS two-component system is required for functional FnBPA activity in serum. Furthermore, serum-developed biofilms deficient in FnBPA were more susceptible to macrophage invasion, and in a model of biofilm-associated implant infection, we found that FnBPA is crucial for the establishment of infection. Together, these findings show that S. aureus FnBPA plays an important role in physical biofilm development and represents a potential therapeutic target for the prevention and treatment of device-associated infections.
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16
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Wang Y, Liu S, Li B, Jiang Y, Zhou X, Chen J, Li M, Ren B, Peng X, Zhou X, Cheng L. Staphylococcus aureus induces COX-2-dependent proliferation and malignant transformation in oral keratinocytes. J Oral Microbiol 2019; 11:1643205. [PMID: 31448061 PMCID: PMC6691923 DOI: 10.1080/20002297.2019.1643205] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 06/25/2019] [Accepted: 07/03/2019] [Indexed: 02/05/2023] Open
Abstract
The COX-2/PGE2 axis can play roles in mediating the progression of tumor. COX-2 induction was observed in oral cancer. In our previous study, we found Staphylococcus aureus, a pathogen prevalent in oral cancer, can activate the COX-2/PGE2 pathway in human oral keratinocyte (HOK) cells. Here, we investigated the proliferation of HOK cells affected by COX-2 induction and the role of COX-2 induction in the malignant transformation of HOK cells. We found S. aureus was able to facilitate HOK cell proliferation through upregulating COX-2 expression. With the induction of COX-2, expression of oral cancer-associated genes cyclin D1 was upregulated and p16 was downregulated. Transcriptome analysis showed that the “NF−kappa B signaling pathway” and “TNF signaling pathway” had the highest enrichment of differentially expressed genes (DEGs) with COX-2 over-expression. Seven upregulated genes (jun, tlr4, cxcl1, lif, cxcl3, tnfrsf1β, and il1β) in these two pathways were critical for the increased proliferation of HOK cells and might be associated with COX-2. Malignant transformation of cells was evaluated by soft agar colony formation assay and S. aureus infection promoted HOK cell colony formation. These results suggest the potential of S. aureus to induce the infection-associated malignant transformation of oral epitheliums through COX-2 activation.
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Affiliation(s)
- Yuxia Wang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, Hospital of Stomatology, Nankai University, Tianjin, China
| | - Shiyu Liu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Bolei Li
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yaling Jiang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xinxuan Zhou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China
| | - Jing Chen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Mingyun Li
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China
| | - Biao Ren
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China
| | - Xian Peng
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Lei Cheng
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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17
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Xu J, He J, Shen Y, Zhou X, Huang D, Gao Y, Haapasalo M. Influence of Endodontic Procedure on the Adherence of Enterococcus faecalis. J Endod 2019; 45:943-949. [PMID: 31130300 DOI: 10.1016/j.joen.2019.04.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 04/01/2019] [Accepted: 04/08/2019] [Indexed: 02/05/2023]
Abstract
INTRODUCTION The purpose of this study was to investigate the effects of instrumentation and irrigation on the initial adherence of Enterococcus faecalis to root canal dentin and to explore initial microbial adhesion to root filling materials. METHODS The following specimens were prepared: instrumented and uninstrumented dentin, dentin treated with different irrigation protocols, and root filling materials. The number of E. faecalis cells adhered on dentin was measured. The adhesion force of E. faecalis cells on different materials and the roughness of different surfaces were measured. The contact angle of the surfaces was recorded. The results were analyzed using the t test. RESULTS Instrumented dentin specimens had a significantly higher amount of E. faecalis adherence than uninstrumented dentin. There were higher numbers of adhering bacteria on the dentin when EDTA was used alone (P < .05) compared with other irrigants alone. The use of chlorhexidine (CHX) as the last irrigant for a certain time resulted in a reduced number of adhering bacteria when the specimens were first exposed to sodium hypochlorite (NaOCl) followed by EDTA. EDTA used alone had the highest adhesion force followed by NaOCl alone and CHX alone (P < .05). Dentin treated with EDTA alone had the highest roughness and contact angle followed by NaOCl alone and CHX alone (P < .05). CHX added as the final irrigant after NaOCl with EDTA irrigation reduced the contact angle (P < .05). Larger amounts of adhering bacteria and higher adhesion force were detected on the surface of gutta-percha and sealer than on the dentin surface (P < .05). CONCLUSIONS Instrumentation and irrigation alter the initial adherence of E. faecalis to root canal dentin and the surface properties of the dentin as well.
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Affiliation(s)
- Jialei Xu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Jinzhi He
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Ya Shen
- Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Dingming Huang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
| | - Yuan Gao
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
| | - Markus Haapasalo
- Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada
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18
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Jaggessar A, Mathew A, Tesfamichael T, Wang H, Yan C, Yarlagadda PK. Bacteria Death and Osteoblast Metabolic Activity Correlated to Hydrothermally Synthesised TiO₂ Surface Properties. Molecules 2019; 24:molecules24071201. [PMID: 30934764 PMCID: PMC6480334 DOI: 10.3390/molecules24071201] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/18/2019] [Accepted: 03/25/2019] [Indexed: 12/11/2022] Open
Abstract
Orthopaedic surgery comes with an inherent risk of bacterial infection, prolonged antibiotic therapy and revision surgery. Recent research has focused on nanostructured surfaces to improve the bactericidal and osseointegrational properties of implants. However, an understanding of the mechanical properties of bactericidal materials is lacking. In this work, the surface properties of hydrothermal TiO2 nanostructured surfaces are investigated for their effect on bactericidal efficiency and cellular metabolic activity of human osteoblast cells. TiO2 nanostructures, approximately 307 nm in height and 14 GPa stiffness, were the most effective structures against both gram-positive (Staphylococcus aureus) and gram-negative (Pseudomonas aeruginosa) bacteria. Statistical analysis significantly correlated structure height to the death of both bacteria strains. In addition, the surface contact angle and Young’s modulus were correlated to osteoblast metabolic activity. Hydrophilic surfaces with a contact angle between 35 and 50° produced the highest cellular metabolic activity rates after 24 h of incubation. The mechanical tests showed that nanostructures retain their mechanical stability and integrity over a long time-period, reaffirming the surfaces’ applicability for implants. This work provides a thorough examination of the surface, mechanical and wettability properties of multifunctional hydrothermally synthesised nanostructured materials, capable of killing bacteria whilst improving osteoblast metabolic rates, leading to improved osseointegration and antibacterial properties of orthopaedic implants.
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Affiliation(s)
- Alka Jaggessar
- Science and Engineering Faculty, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia.
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4059, Australia.
| | - Asha Mathew
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4059, Australia.
| | - Tuquabo Tesfamichael
- Science and Engineering Faculty, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia.
| | - Hongxia Wang
- Science and Engineering Faculty, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia.
| | - Cheng Yan
- Science and Engineering Faculty, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia.
| | - Prasad Kdv Yarlagadda
- Science and Engineering Faculty, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia.
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4059, Australia.
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19
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Cordero OJ, Varela-Calviño R. Oral hygiene might prevent cancer. Heliyon 2018; 4:e00879. [PMID: 30417145 PMCID: PMC6218413 DOI: 10.1016/j.heliyon.2018.e00879] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 09/26/2018] [Accepted: 10/19/2018] [Indexed: 12/21/2022] Open
Abstract
Many evidences support that species from the Human Oral Microbiome Database such as Fusobacterium nucleatum or Bacteroides, linked previously to periodontitis and appendicitis, play a role in colorectal cancer (CRC), including metastasis. These typically oral species are invasive anaerobes that form biofilms in their virulent state. Aspirin (a NSAID) has been recently included into routine CRC prevention rationale. NSAIDs can prevent the growth of neoplastic lesions by inhibiting COX enzymes and another set of recently identified COX-independent targets, which include the WNT, AMPK and MTOR signaling pathways, the crosstalk between nucleoli and NF-κB transcriptional activity in apoptosis, and the biochemistry of platelets. These are signaling pathways related to tumor-promoting inflammation. In this process, pathogens or simple deregulation of the microbiota play an important role in CRC. Aspirin and other NSAIDs are efficient inhibitors of biofilm formation and able to control periodontitis development preventing inflammation related to the microbiota of the gingival tissue, so its seems plausible to include this pathway in the mechanisms that aspirin uses to prevent CRC. We propose arguments suggesting that current oral hygiene methods and other future developments against periodontitis might prevent CRC and probably other cancers, alone or in combination with other options; and that the multidisciplinary studies needed to prove this hypothesis might be relevant for cancer prevention.
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Affiliation(s)
- Oscar J. Cordero
- University of Santiago de Compostela, Department of Biochemistry and Molecular Biology, Campus Vida, 15782 Santiago de Compostela, Spain
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20
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Abstract
The body is exposed to foreign pathogens every day, but remarkably, most pathogens are effectively cleared by the innate immune system without the need to invoke the adaptive immune response. Key cellular components of the innate immune system include macrophages and neutrophils and the recruitment and function of these cells are tightly regulated by chemokines and cytokines in the tissue space. Innate immune responses are also known to regulate development of adaptive immune responses often via the secretion of various cytokines. In addition to these protein regulators, numerous lipid mediators can also influence innate and adaptive immune functions. In this review, we cover one particular lipid regulator, prostaglandin E2 (PGE2) and describe its synthesis and signaling and what is known about the ability of this lipid to regulate immunity and host defense against viral, fungal and bacterial pathogens.
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Affiliation(s)
| | - Bethany B Moore
- Pulmonary and Critical Care Medicine Division, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA; Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI, USA.
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