1
|
Farouk F, Shebl RI. LC-MS/MS determination of pyocyanin-N-acetyl cysteine adduct: application for understanding Pseudomonas aeruginosa virulence factor neutralization. ANAL SCI 2024; 40:891-905. [PMID: 38472735 DOI: 10.1007/s44211-024-00531-9] [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: 11/04/2023] [Accepted: 02/06/2024] [Indexed: 03/14/2024]
Abstract
Combating Pseudomonas aeruginosa infection is challenging. It secretes pyocyanin (PCN) pigment that contributes to its virulence. Neutralizing PCN via reaction with thiol-containing compounds may represent a potential therapeutic option. This study investigates the neutralization reaction between PCN and N-acetyl cysteine (NAC) for bacterial inhibition and explores its mechanism of action. The neutralization adduct (PCN-NAC) was synthesized by reacting the purified PCN and NAC. The adduct was analyzed and its structure was elucidated. LC-MS/MS method was developed for the determination of PCN-NAC in P. aeruginosa cultures post-treatment with NAC (0-5 mg/mL). The corresponding anti-bacterial potential was estimated and compared to nanoparticles (NPs) alone and under stress conditions. In silico studies were performed to support explaining the mechanism of action. Results revealed that PCN-NAC was exclusively detected in NAC-treated cultures in a concentration-dependent manner. PCN-NAC concentration (230-915 µg/mL) was directly proportional to the reduction in the bacterial viable count (28.3% ± 7.1-87.5% ± 5.9) and outperformed all tested NPs, where chitosan NPs induced 56.9% ± 7.9 inhibition, followed by zinc NPs (49.4% ± 0.9) and gold NPs (17.8% ± 7.5) even post-exposure to different stress conditions. A concomitant reduction in PCN concentration was detected. In silico studies revealed possible interactions between key bacterial proteins and PCN-NAC rather than the NAC itself. These results pose NAC as a potential choice for the management of P. aeruginosa infection, where it neutralizes PCN via the formation of PCN-NAC adduct.
Collapse
Affiliation(s)
- Faten Farouk
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Ahram Canadian University, Giza, Egypt.
| | - Rania Ibrahim Shebl
- Microbiology and Immunology Department, Faculty of Pharmacy, Ahram Canadian University, Giza, Egypt
| |
Collapse
|
2
|
Mudaliar SB, Bharath Prasad AS. A biomedical perspective of pyocyanin from Pseudomonas aeruginosa: its applications and challenges. World J Microbiol Biotechnol 2024; 40:90. [PMID: 38341389 PMCID: PMC10858844 DOI: 10.1007/s11274-024-03889-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 01/08/2024] [Indexed: 02/12/2024]
Abstract
Pyocyanin is a bioactive pigment produced by Pseudomonas aeruginosa. It is an important virulence factor that plays a critical role in P. aeruginosa infections as a redox-active secondary metabolite and a quorum sensing (QS) signaling molecule. Pyocyanin production from chorismic acid requires the involvement of two homologous operons, phz1 and phz2, which are activated by QS regulatory proteins. Pyocyanin inhibits the proliferation of bacterial, fungal, and mammalian cells by inducing oxidative stress due to which it acts as a potent antibacterial, antifungal, and anticancer agent. Its potential role as a neuroprotectant needs further exploration. However, pyocyanin exacerbates the damaging effects of nosocomial infections caused by P. aeruginosa in immunocompromised individuals. Further, cystic fibrosis (CF) patients are highly susceptible to persistent P. aeruginosa infections in the respiratory system. The bacterial cells form colonies and three interconnected QS networks-pqs, las, and rhl-get activated, thus stimulating the cells to produce pyocyanin which exacerbates pulmonary complications. As an opportunistic pathogen, P. aeruginosa produces pyocyanin to impede the recovery of injuries like burn wounds through its anti-proliferative activity. Moreover, pyocyanin plays a vital role in compounding P. aeruginosa infections by promoting biofilm formation. This review begins with a brief description of the characteristics of pyocyanin, its activity, and the different aspects of its production including its biosynthesis, the role of QS, and the effect of environmental factors. It then goes on to explore the potential applications of pyocyanin as a biotherapeutic molecule while also highlighting the biomedical challenges and limitations that it presents.
Collapse
Affiliation(s)
- Samriti Balaji Mudaliar
- Department of Public Health & Genomics, Manipal School of Life Sciences (MSLS), Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, 576104, India
| | - Alevoor Srinivas Bharath Prasad
- Department of Public Health & Genomics, Manipal School of Life Sciences (MSLS), Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, 576104, India.
| |
Collapse
|
3
|
Sen CK, Roy S, Khanna S. Diabetic Peripheral Neuropathy Associated with Foot Ulcer: One of a Kind. Antioxid Redox Signal 2023. [PMID: 35850520 DOI: 10.1089/ars.2022.0093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Significance: Diabetic peripheral neuropathy (DPN) associated with a diabetic foot ulcer (DFU) is likely to be complicated with critical factors such as biofilm infection and compromised skin barrier function of the diabetic skin. Repaired skin with a history of biofilm infection is known to be compromised in barrier function. Loss of barrier function is also observed in the oxidative stress affected diabetic and aged skin. Recent Advances: Loss of barrier function makes the skin prone to biofilm infection and cellulitis, which contributes to chronic inflammation and vasculopathy. Hyperglycemia favors biofilm formation as glucose lowering led to reduction in biofilm development. While vasculopathy limits oxygen supply, the O2 cost of inflammation is high increasing hypoxia severity. Critical Issues: The host nervous system can be inhabited by bacteria. Because electrical impulses are a part of microbial physiology, polymicrobial colonization of the host's neural circuit is likely to influence transmission of action potential. The identification of perineural apatite in diabetic patients with peripheral neuropathy suggests bacterial involvement. DPN starts in both feet at the same time. Future Directions: Pair-matched studies of DPN in the foot affected with DFU (i.e., DFU-DPN) compared with DPN in the without ulcer, and intact skin barrier function, are likely to provide critical insight that would help inform effective care strategies. This review characterizes DFU-DPN from a translational science point of view presenting a new paradigm that recognizes the current literature in the context of factors that are unique to DFU-DPN.
Collapse
Affiliation(s)
- Chandan K Sen
- Indiana Center for Regenerative Medicine & Engineering, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Sashwati Roy
- Indiana Center for Regenerative Medicine & Engineering, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Savita Khanna
- Indiana Center for Regenerative Medicine & Engineering, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana, USA
| |
Collapse
|
4
|
Peng W, Li H, Zhao X, Shao B, Zhu K. Pyocyanin Modulates Gastrointestinal Transformation and Microbiota. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:2722-2732. [PMID: 35171599 DOI: 10.1021/acs.jafc.1c07726] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Phenazines are ubiquitously produced by Pseudomonas spp. in the environment and are widely used in agriculture and clinical therapies, making their accumulation through the food chain cause potential risks to human health. Here, we utilized pyocyanin (PYO) as a representative to study the effects of phenazines on digestive tracts. Pharmacokinetic analysis showed that PYO exhibited low systemic exposure, slow elimination, and low accumulation in both rat and pig models. PYO was subsequently found to induce intestinal microbiota dysbiosis, destroy the mucus layer and physical barrier, and even promote gut vascular barrier (GVB) impairment, consequently increasing the gut permeability. Additionally, integral and metabolomic analyses of the liver demonstrated that PYO induced liver inflammation and metabolic disorders. The metabolic analysis further confirmed that all of the metabolites of PYO retain the nitrogen-containing tricyclic structural skeleton of phenazines, which was the core bioactivity of phenazine compounds. These findings elucidated that PYO could be metabolized by animals. Meanwhile, high levels of PYO could induce intestinal barrier impairment and liver damage, suggesting that we should be alert to the accumulation of phenazines.
Collapse
Affiliation(s)
- Wenjing Peng
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Hui Li
- Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Center for Disease Prevention and Control, Beijing 100013, China
| | - Xiaole Zhao
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Bing Shao
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
- Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Center for Disease Prevention and Control, Beijing 100013, China
| | - Kui Zhu
- National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| |
Collapse
|
5
|
Ruenchit P, Whangviboonkij N, Sawasdipokin H, Phumisantiphong U, Chaicumpa W. A Search for Anti- Naegleria fowleri Agents Based on Competitive Exclusion Behavior of Microorganisms in Natural Aquatic Environments. Pathogens 2021; 10:pathogens10020142. [PMID: 33535404 PMCID: PMC7911858 DOI: 10.3390/pathogens10020142] [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: 12/22/2020] [Revised: 01/28/2021] [Accepted: 01/28/2021] [Indexed: 11/16/2022] Open
Abstract
Naegleria fowleri causes deadly primary amoebic meningoencephalitis (PAM) in humans. Humans obtain the infection by inhaling water or dust contaminated with amebae into the nostrils, wherefrom the pathogen migrates via the olfactory nerve to cause brain inflammation and necrosis. Current PAM treatment is ineffective and toxic. Seeking new effective and less toxic drugs for the environmental control of the amoeba population to reduce human exposure is logical for the management of N. fowleri infection. On the basis of the concept of competitive exclusion, where environmental microorganisms compete for resources by secreting factors detrimental to other organisms, we tested cell-free culture supernatants (CFSs) of three bacteria isolated from a fresh water canal, i.e., Pseudomonas aeruginosa, Pseudomonas otitidis, and Enterobacter cloacae, were tested against N. fowleri. The CFSs inhibited growth and caused morphological changes in N. fowleri. At low dose, N. fowleri trophozoites exposed to P. aeruginosa pyocyanin were seen to shrink and become rounded, while at high dose, the trophozoites were fragmented. While the precise molecular mechanisms of pyocyanin and products of P. otitidis and E. cloacae that also exert anti-N. fowleri activity await clarification. Our findings suggest that P. aeruginosa pyocyanin may have a role in the control of amphizoic N. fowleri in the environment.
Collapse
Affiliation(s)
- Pichet Ruenchit
- Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand; (N.W.); (H.S.)
- Correspondence: ; Tel.: +66-2-419-6484; Fax: +66-2-419-6470
| | - Narisara Whangviboonkij
- Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand; (N.W.); (H.S.)
| | - Hathai Sawasdipokin
- Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand; (N.W.); (H.S.)
| | - Uraporn Phumisantiphong
- Department of Clinical Pathology, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Bangkok 10300, Thailand;
| | - Wanpen Chaicumpa
- Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand;
| |
Collapse
|
6
|
Marreiro de Sales-Neto J, Lima ÉA, Cavalcante-Silva LHA, Vasconcelos U, Rodrigues-Mascarenhas S. Anti-inflammatory potential of pyocyanin in LPS-stimulated murine macrophages. Immunopharmacol Immunotoxicol 2019; 41:102-108. [PMID: 30623710 DOI: 10.1080/08923973.2018.1555845] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Context: Pyocyanin is a typical Pseudomonas aeruginosa virulence factor, a common Gram-negative rod responsible for a wide range of severe nosocomial infections. There is evidence indicating that pyocyanin has multiple biological activities, but little is known about anti-inflammatory properties. Objective: This study investigated pyocyanin effect on nitric oxide and cytokine production in lipopolysaccharide (LPS)-activated murine peritoneal macrophages. Materials and methods: Macrophages were incubated in the presence and absence of pyocyanin (1, 5, 10, 50, and 100 µM) with and without LPS (1 µg/mL). Nitric oxide production was determined by Griess reagent and tumor necrosis factor (TNF)-α and interleukin (IL)-1β production was assessed by enzyme-linked immunosorbent assay. In addition, pyocyanin effects on zymosan A-induced peritonitis in mice were evaluated. Results: Pyocyanin (5 and 10 µM) decreased nitric oxide, TNF-α, and IL-1β production independent of macrophage death. On the other hand, in vivo, pyocyanin (5 mg/kg) was not able to affect leukocyte migration into the site of inflammation. Discussion and conclusion: Thus, our findings suggest that pyocyanin exerts anti-inflammatory effects on murine peritoneal macrophages, downregulating nitric oxide, TNF-α, and IL-1β levels, which seems to be independent of cell migration. These effects may represent a mechanism of immune evasion; nevertheless more detailed studies should be performed to confirm this hypothesis.
Collapse
Affiliation(s)
| | - É A Lima
- a Departamento de Biologia Celular e Molecular , Universidade Federal da Paraíba , João Pessoa , Brazil
| | - L H A Cavalcante-Silva
- a Departamento de Biologia Celular e Molecular , Universidade Federal da Paraíba , João Pessoa , Brazil
| | - U Vasconcelos
- b Departamento de Biotecnologia , Universidade Federal da Paraíba , João Pessoa , Brazil
| | - S Rodrigues-Mascarenhas
- a Departamento de Biologia Celular e Molecular , Universidade Federal da Paraíba , João Pessoa , Brazil
| |
Collapse
|
7
|
Li JL, Yang N, Huang L, Chen D, Zhao Y, Tang MM, Fan H, Bao X. Pyocyanin Inhibits Chlamydia Infection by Disabling Infectivity of the Elementary Body and Disrupting Intracellular Growth. Antimicrob Agents Chemother 2018; 62:e02260-17. [PMID: 29610203 PMCID: PMC5971585 DOI: 10.1128/aac.02260-17] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 03/19/2018] [Indexed: 11/20/2022] Open
Abstract
The obligate intracellular bacterium Chlamydia is a widespread human pathogen that causes serious problems, including (but not limited to) infertility and blindness. Our search for novel antichlamydial metabolites from marine-derived microorganisms led to the isolation of pyocyanin, a small compound from Pseudomonas aeruginosa Pyocyanin is an effective antichlamydial for all three Chlamydia spp. tested. It has a 50% inhibitory concentration (IC50) of 0.019 to 0.028 μM, which is comparable to the IC50 of tetracycline. At concentrations as low as 0.0039 μM, pyocyanin disables infectivity of the chlamydial elementary body (EB). At 0.5 μM or higher concentrations, the continuous presence of pyocyanin also inhibits chlamydial growth in the inclusion during later stages of the developmental cycle. Oxidative stress, a major known antimicrobial mechanism of pyocyanin, appears to be responsible only for the inhibition of bacterial growth and not for the disinfection of EBs. Pyocyanin is well-tolerated by probiotic vaginal Lactobacillus spp. Our findings suggest that pyocyanin is of therapeutic value for chlamydial infections and can serve as a valuable chemical probe for studying chlamydial biology.
Collapse
Affiliation(s)
- Jian Lin Li
- School of Pharmacy, Nantong University, Nantong, China
| | - Ningjing Yang
- School of Pharmacy, Nantong University, Nantong, China
| | - Lei Huang
- School of Pharmacy, Nantong University, Nantong, China
- Department of Pharmacy, The First People's Hospital of Yanchen, Yanchen, China
| | - Dandan Chen
- Department of Pharmacy, The Second People's Hospital of Nantong, Nantong, China
| | - Yu Zhao
- School of Pharmacy, Nantong University, Nantong, China
| | - M Matt Tang
- Robert Wood Johnson Medical School, Rutgers University, Piscataway, New Jersey, USA
| | - Huizhou Fan
- Robert Wood Johnson Medical School, Rutgers University, Piscataway, New Jersey, USA
| | - Xiaofeng Bao
- School of Pharmacy, Nantong University, Nantong, China
| |
Collapse
|
8
|
Arora D, Hall S, Anoopkumar-Dukie S, Morrison R, McFarland A, Perkins AV, Davey AK, Grant GD. Pyocyanin induces systemic oxidative stress, inflammation and behavioral changes in vivo. Toxicol Mech Methods 2018; 28:410-414. [DOI: 10.1080/15376516.2018.1429038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Devinder Arora
- School of Pharmacy and Pharmacology, Griffith University, Queensland, Australia
- Quality Use of Medicines Network, Griffith University, Queensland, Australia
- Menzies Institute, Griffith University, Queensland, Australia
| | - Susan Hall
- School of Pharmacy and Pharmacology, Griffith University, Queensland, Australia
- Quality Use of Medicines Network, Griffith University, Queensland, Australia
- Menzies Institute, Griffith University, Queensland, Australia
| | - Shailendra Anoopkumar-Dukie
- School of Pharmacy and Pharmacology, Griffith University, Queensland, Australia
- Quality Use of Medicines Network, Griffith University, Queensland, Australia
- Menzies Institute, Griffith University, Queensland, Australia
| | - Rachel Morrison
- School of Pharmacy and Pharmacology, Griffith University, Queensland, Australia
| | - Amelia McFarland
- School of Pharmacy and Pharmacology, Griffith University, Queensland, Australia
- Quality Use of Medicines Network, Griffith University, Queensland, Australia
- Menzies Institute, Griffith University, Queensland, Australia
| | - Anthony V. Perkins
- Menzies Institute, Griffith University, Queensland, Australia
- School of Medical Science, Griffith University, Gold Coast, Australia
| | - Andrew K. Davey
- School of Pharmacy and Pharmacology, Griffith University, Queensland, Australia
- Quality Use of Medicines Network, Griffith University, Queensland, Australia
- Menzies Institute, Griffith University, Queensland, Australia
| | - Gary D. Grant
- School of Pharmacy and Pharmacology, Griffith University, Queensland, Australia
- Quality Use of Medicines Network, Griffith University, Queensland, Australia
- Menzies Institute, Griffith University, Queensland, Australia
| |
Collapse
|
9
|
Lang E, Bissinger R, Qadri SM, Lang F. Suicidal death of erythrocytes in cancer and its chemotherapy: A potential target in the treatment of tumor-associated anemia. Int J Cancer 2017; 141:1522-1528. [DOI: 10.1002/ijc.30800] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 05/02/2017] [Accepted: 05/17/2017] [Indexed: 01/18/2023]
Affiliation(s)
- Elisabeth Lang
- Department of Molecular Medicine II; Heinrich Heine University of Düsseldorf; Düsseldorf Germany
| | - Rosi Bissinger
- Department of Internal Medicine III; Eberhard-Karls-University of Tübingen; Tübingen Germany
| | - Syed M. Qadri
- Department of Pathology and Molecular Medicine; McMaster University; Hamilton ON Canada
- Centre for Innovation, Canadian Blood Services; Hamilton ON Canada
| | - Florian Lang
- Department of Internal Medicine III; Eberhard-Karls-University of Tübingen; Tübingen Germany
| |
Collapse
|
10
|
Genomic analyses of multidrug resistant Pseudomonas aeruginosa PA1 resequenced by single-molecule real-time sequencing. Biosci Rep 2016; 36:BSR20160282. [PMID: 27765811 PMCID: PMC5293553 DOI: 10.1042/bsr20160282] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 10/17/2016] [Accepted: 10/20/2016] [Indexed: 11/17/2022] Open
Abstract
As a third-generation sequencing (TGS) method, single-molecule real-time (SMRT) technology provides long read length, and it is well suited for resequencing projects and de novo assembly. In the present study, Pseudomonas aeruginosa PA1 was characterized and resequenced using SMRT technology. PA1 was also subjected to genomic, comparative and pan-genomic analyses. The multidrug resistant strain PA1 possesses a 6,498,072 bp genome and a sequence type of ST-782. The genome of PA1 was also visualized, and the results revealed the details of general genome annotations, virulence factors, regulatory proteins (RPs), secretion system proteins, type II toxin–antitoxin (T–A) pairs and genomic islands. Whole genome comparison analysis suggested that PA1 exhibits similarity to other P. aeruginosa strains but differs in terms of horizontal gene transfer (HGT) regions, such as prophages and genomic islands. Phylogenetic analyses based on 16S rRNA sequences demonstrated that PA1 is closely related to PAO1, and P. aeruginosa strains can be divided into two main groups. The pan-genome of P. aeruginosa consists of a core genome of approximately 4,000 genes and an accessory genome of at least 6,600 genes. The present study presented a detailed, visualized and comparative analysis of the PA1 genome, to enhance our understanding of this notorious pathogen.
Collapse
|
11
|
Cellular Effects of Pyocyanin, a Secreted Virulence Factor of Pseudomonas aeruginosa. Toxins (Basel) 2016; 8:toxins8080236. [PMID: 27517959 PMCID: PMC4999852 DOI: 10.3390/toxins8080236] [Citation(s) in RCA: 244] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 08/03/2016] [Accepted: 08/03/2016] [Indexed: 11/17/2022] Open
Abstract
Pyocyanin has recently emerged as an important virulence factor produced by Pseudomonas aeruginosa. The redox-active tricyclic zwitterion has been shown to have a number of potential effects on various organ systems in vitro, including the respiratory, cardiovascular, urological, and central nervous systems. It has been shown that a large number of the effects to these systems are via the formation of reactive oxygen species. The limitations of studies are, to date, focused on the localized effect of the release of pyocyanin (PCN). It has been postulated that, given its chemical properties, PCN is able to readily cross biological membranes, however studies have yet to be undertaken to evaluate this effect. This review highlights the possible manifestations of PCN exposure; however, most studies to date are in vitro. Further high quality in vivo studies are needed to fully assess the physiological manifestations of PCN exposure on the various body systems.
Collapse
|
12
|
Qadri SM, Donkor DA, Bhakta V, Eltringham-Smith LJ, Dwivedi DJ, Moore JC, Pepler L, Ivetic N, Nazi I, Fox-Robichaud AE, Liaw PC, Sheffield WP. Phosphatidylserine externalization and procoagulant activation of erythrocytes induced by Pseudomonas aeruginosa virulence factor pyocyanin. J Cell Mol Med 2016; 20:710-20. [PMID: 26781477 PMCID: PMC5125577 DOI: 10.1111/jcmm.12778] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 12/04/2015] [Indexed: 12/16/2022] Open
Abstract
The opportunistic pathogen Pseudomonas aeruginosa causes a wide range of infections in multiple hosts by releasing an arsenal of virulence factors such as pyocyanin. Despite numerous reports on the pleiotropic cellular targets of pyocyanin toxicity in vivo, its impact on erythrocytes remains elusive. Erythrocytes undergo an apoptosis‐like cell death called eryptosis which is characterized by cell shrinkage and phosphatidylserine (PS) externalization; this process confers a procoagulant phenotype on erythrocytes as well as fosters their phagocytosis and subsequent clearance from the circulation. Herein, we demonstrate that P. aeruginosa pyocyanin‐elicited PS exposure and cell shrinkage in erythrocyte while preserving the membrane integrity. Mechanistically, exposure of erythrocytes to pyocyanin showed increased cytosolic Ca2+ activity as well as Ca2+‐dependent proteolytic processing of μ‐calpain. Pyocyanin further up‐regulated erythrocyte ceramide abundance and triggered the production of reactive oxygen species. Pyocyanin‐induced increased PS externalization in erythrocytes translated into enhanced prothrombin activation and fibrin generation in plasma. As judged by carboxyfluorescein succinimidyl‐ester labelling, pyocyanin‐treated erythrocytes were cleared faster from the murine circulation as compared to untreated erythrocytes. Furthermore, erythrocytes incubated in plasma from patients with P. aeruginosa sepsis showed increased PS exposure as compared to erythrocytes incubated in plasma from healthy donors. In conclusion, the present study discloses the eryptosis‐inducing effect of the virulence factor pyocyanin, thereby shedding light on a potentially important mechanism in the systemic complications of P. aeruginosa infection.
Collapse
Affiliation(s)
- Syed M Qadri
- Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada.,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - David A Donkor
- Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada.,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Varsha Bhakta
- Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada
| | | | - Dhruva J Dwivedi
- Thrombosis and Atherosclerosis Research Institute (TaARI), McMaster University, Hamilton, ON, Canada.,Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Jane C Moore
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Laura Pepler
- Thrombosis and Atherosclerosis Research Institute (TaARI), McMaster University, Hamilton, ON, Canada.,Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Nikola Ivetic
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, Canada
| | - Ishac Nazi
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Alison E Fox-Robichaud
- Thrombosis and Atherosclerosis Research Institute (TaARI), McMaster University, Hamilton, ON, Canada.,Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Patricia C Liaw
- Thrombosis and Atherosclerosis Research Institute (TaARI), McMaster University, Hamilton, ON, Canada.,Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - William P Sheffield
- Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada.,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| |
Collapse
|