101
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Hu XP, Yin FW, Zhou DY, Xie HK, Zhu BW, Ma XC, Tian XG, Wang C, Shahidi F. Stability of resveratrol esters with caprylic acid during simulated in vitro gastrointestinal digestion. Food Chem 2018; 276:675-679. [PMID: 30409647 DOI: 10.1016/j.foodchem.2018.10.062] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 10/01/2018] [Accepted: 10/11/2018] [Indexed: 02/07/2023]
Abstract
Lipophenols, esterified phenols with fatty acids, have attracted increasing attention because of their better protective effects in lipid-based food matrices from oxidation. However, little is known about their digestion. In this study, the digestive stability of resveratrol (RSV) esters with caprylic acid (RCAPs) in a model gastrointestinal digestion system was evaluated. The results demonstrated that RCAPs were relatively stable without hydrolysis in mouth and gastric phases. However, in the intestinal phase, pancreatic lipase rather than phospholipase A2 could hydrolyze monoester and diesters to free RSV. After 120 min of incubation at 37 °C, 53.68% of monoester and 11.36% of diesters were hydrolyzed. However, no hydrolysis of the triester was noticed. Obviously, the level of hydrolysis of RCAPs was negatively correlated with the degree of substitution. Therefore, it was speculated that RSV in fatty acid ester forms could partially be absorbed by intestinal lumen in the form of free RSV.
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Affiliation(s)
- Xiao-Pei Hu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China
| | - Fa-Wen Yin
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, PR China
| | - Da-Yong Zhou
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, PR China; National Engineering Research Center of Seafood, Dalian 116034, PR China
| | - Hong-Kai Xie
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China
| | - Bei-Wei Zhu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China; School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, PR China; National Engineering Research Center of Seafood, Dalian 116034, PR China.
| | - Xiao-Chi Ma
- School of Pharmacy, Dalian Medical University, Dalian 116044, PR China.
| | - Xiang-Ge Tian
- School of Pharmacy, Dalian Medical University, Dalian 116044, PR China
| | - Chao Wang
- School of Pharmacy, Dalian Medical University, Dalian 116044, PR China
| | - Fereidoon Shahidi
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, NL A1B3X9, Canada
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102
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Samuchiwal SK, Balestrieri B. Harmful and protective roles of group V phospholipase A 2: Current perspectives and future directions. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1864:819-826. [PMID: 30308324 DOI: 10.1016/j.bbalip.2018.10.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 09/27/2018] [Accepted: 10/01/2018] [Indexed: 12/17/2022]
Abstract
Group V Phospholipase A2 (Pla2g5) is a member of the PLA2 family of lipid-generating enzymes. It is expressed in immune and non-immune cell types and is inducible during several pathologic conditions serving context-specific functions. In this review, we recapitulate the protective and detrimental functions of Pla2g5 investigated through preclinical and translational approaches. This article is part of a Special Issue entitled Novel functions of phospholipase A2 Guest Editors: Makoto Murakami and Gerard Lambeau.
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Affiliation(s)
- Sachin K Samuchiwal
- Department of Medicine, Harvard Medical School, Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - Barbara Balestrieri
- Department of Medicine, Harvard Medical School, Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA 02115, USA.
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103
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Tang H, Wang L, Chen Y, He J, Qu L, Guo Y, Liu Y, Liu X, Lin H. Ovulation is associated with the LH-dependent induction of pla2g4aa in zebrafish. Mol Cell Endocrinol 2018; 473:53-60. [PMID: 29326060 DOI: 10.1016/j.mce.2018.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 12/17/2017] [Accepted: 01/07/2018] [Indexed: 01/14/2023]
Abstract
The effects of the preovulatory luteinizing hormone (LH) surge on the ovulatory process are mediated by prostaglandins (PGs), the synthesis of which involves prostaglandin synthetase and cytosolic phospholipase A2 (cPLA2). In our previous study, we systematically investigated the function of prostaglandin endoperoxide synthase (ptgs) genes on ovulation in zebrafish. However, the role of cPLA2 in ovulation was not determined in zebrafish. In this study, we investigated the function of cpla2α in PGs production and ovulation in periovulatory follicles. Our data showed that the expression of pla2g4aa increased during zebrafish folliculogenesis and the follicular layer was the primary region with expression of pla2g4aa. In addition, the expression of pla2g4aa was regulated by LH in vitro and in vivo. Furthermore, injection of AACOCF3, a specific inhibitor of cPLA2, significantly reduced ovarian PGs level and blocked hCG-induced ovulation. Collectively, these findings suggest that pla2g4aa is related to the ovulation process in zebrafish.
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Affiliation(s)
- Haipei Tang
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Le Wang
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yu Chen
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jianan He
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Ling Qu
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yin Guo
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yun Liu
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
| | - Xiaochun Liu
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China.
| | - Haoran Lin
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China
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104
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Wang Y, Wang Q, Bao X, Ding Y, Shentu J, Cui W, Chen X, Wei X, Xu S. Taxifolin prevents β-amyloid-induced impairments of synaptic formation and deficits of memory via the inhibition of cytosolic phospholipase A 2/prostaglandin E 2 content. Metab Brain Dis 2018. [PMID: 29542038 DOI: 10.1007/s11011-018-0207-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Taxifolin is a potent flavonoid with anti-inflammatory activity. Taxifolin has been reported to decrease the accumulation of β-amyloid (Aβ), and reduce Aβ-induced neurotoxicity. However, the detail molecular mechanism of taxifolin against Aβ-induced neurotoxicity is largely unknown. In this study, we revealed the protective effects and the underlying mechanisms of taxifolin on the impairments of cognitive function and synapse formation induced by soluble Aβ oligomers. Our results showed that taxifolin prevented neuronal cell death in a concentration-dependent manner. The recognition memory in novel object recognition tasks and the spatial memory in Morris water maze tests are significantly lower in the Alzheimer's disease (AD) model mice induced by hippocampal injection of Aβ42. Taxifolin treatment prevented the recognitive and spatial memory deficits of the AD mice. 10 mg/kg taxifolin treatment also significantly prevented the decreased expression levels of PSD 95 induced by Aβ42. Live cell imaging study showed that 2 h pre-treatment of taxifolin prevented the decrease in the number of filopodium and spine induced by Aβ42 oligomers. Aβ42 oligomers significantly increased the production of cytosolic phospholipase A2 (cPLA2), a crucial enzyme of pro-inflammatory mediator, and prostaglandin E2 (PGE2), a neuroinflammatory molecule. Taxifolin significantly reduced the content of cPLA2 and PGE2 induced by Aβ42 both in the primary hippocampal neurons and hippocampal tissues. These results indicated that taxifolin might prevent Aβ42 oligomer-induced synapse and cognitive impairments through decreasing cPLA2 and PGE2. Our study provided novel insights into the cellular mechanisms for the protective effects of taxifolin on AD.
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Affiliation(s)
- Yuanyuan Wang
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Qinwen Wang
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Xiaoming Bao
- The No.2 Hospital of Ningbo, Ningbo, Zhejiang, 315010, China
| | - Yanfei Ding
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Jieyi Shentu
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Wei Cui
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Xiaowei Chen
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Xiaofei Wei
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Shujun Xu
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine Ningbo University, Ningbo, Zhejiang, 315211, China.
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105
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Lippestad M, Hodges RR, Utheim TP, Serhan CN, Dartt DA. Signaling pathways activated by resolvin E1 to stimulate mucin secretion and increase intracellular Ca 2+ in cultured rat conjunctival goblet cells. Exp Eye Res 2018; 173:64-72. [PMID: 29702100 PMCID: PMC6488018 DOI: 10.1016/j.exer.2018.04.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 04/18/2018] [Accepted: 04/23/2018] [Indexed: 12/31/2022]
Abstract
Glycoconjugate mucin secretion from conjunctival goblet cells is tightly regulated by nerves and specialized pro-resolving mediators (SPMs) to maintain ocular surface health. Here we investigated the actions of the SPM resolvin E1 (RvE1) on cultured rat conjunctival goblet cell glycoconjugate secretion and intracellular [Ca2+] ([Ca2+]i) and the signaling pathways used by RvE1. Goblet cells were cultured from rat conjunctiva in RPMI medium. The amount of RvE1-stimulated glycoconjugate mucin secretion was determined using an enzyme-linked lectin assay with Ulex Europaeus Agglutinin 1 lectin. Cultured goblet cells were also incubated with the Ca2+ indicator dye fura 2/AM and [Ca2+]i was measured. Cultured goblet cells were incubated with inhibitors to phospholipase (PL-) C, D, and A2 signaling pathways. RvE1 stimulated glycoconjugate secretion in a concentration dependent manner and was inhibited with the Ca2+ chelator BAPTA. The Ca2+i response was also increased in a concentration manner when stimulated by RvE1. Inhibition of PLC, PLD, and PLA2, but not Ca2+/calmodulin-dependent kinase blocked RvE1-stimulated increase in [Ca2+]i and glycoconjugate secretion. We conclude that under normal, physiological conditions RvE1 stimulates multiple pathways to increase glycoconjugate secretion and [Ca2+]i. RvE1 could be an important regulator of goblet cell glycoconjugate mucin secretion to maintain ocular surface health.
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Affiliation(s)
- Marit Lippestad
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, MA, USA; Faculty of Medicine, University of Oslo, Oslo, Norway; Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Robin R Hodges
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - Tor P Utheim
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, MA, USA; Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway; Department of Plastic and Reconstructive Surgery, University of Oslo, Oslo, Norway
| | - Charles N Serhan
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Darlene A Dartt
- Schepens Eye Research Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, MA, USA; Department of Plastic and Reconstructive Surgery, University of Oslo, Oslo, Norway.
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106
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Zhang D, Li J, Sun S, Huang C. The inhibitory effect of saPLIγ, a snake sourced PLA 2 inhibitor on carrageenan-induced inflammation in mice. Toxicon 2018; 151:89-95. [PMID: 30003915 DOI: 10.1016/j.toxicon.2018.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/07/2018] [Accepted: 07/05/2018] [Indexed: 12/23/2022]
Abstract
SaPLIγ is a natural phospholipase A2 (PLA2) inhibitor, isolated from Sinonatrix annularis, that has been demonstrated to protect against envenomation by other venomous snakes. As snake venom PLA2s and mammalian secretory PLA2s are similar, saPLIγ is thought to have potential to alleviate inflammatory reactions in which PLA2s act as a key enzyme for arachidonic acid release. The aim of this study was to investigate the anti-inflammatory effects and mechanisms of action of saPLIγ in an animal model of carrageenan-induced acute inflammation. The results indicated that saPLIγ inhibited PLA2 subtypes extensively, especially IIA-PLA2, in a dose-dependent manner. Paw swelling in mice was reduced markedly by intraperitoneal saPLIγ 2.5 mg/kg, and the effect was significantly better than observed with dexamethasone at the same dose. Lower neutrophil infiltration and tissue edema was observed in the paws of saPLIγ-treated mice. Additionally, carrageenan-induced cyclooxygenase-2 (COX-2) and pro-inflammatory cytokines (TNFα and IL-1β) were also significantly down-regulated by saPLIγ in a dose-dependent manner. These results suggested that saPLIγ had effective anti-inflammatory effects in vivo, and these were produced by blocking mammalian IB, IIA, V and X sPLA2 subtypes.
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Affiliation(s)
- Denghong Zhang
- Department of Biochemistry, College of Basic Medical Science, Nanchang University, Jiangxi province, China
| | - Jingjing Li
- Department of Biochemistry, College of Basic Medical Science, Nanchang University, Jiangxi province, China
| | - Shimin Sun
- Department of Biochemistry, College of Basic Medical Science, Nanchang University, Jiangxi province, China
| | - Chunhong Huang
- Department of Biochemistry, College of Basic Medical Science, Nanchang University, Jiangxi province, China.
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107
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Kim Y, Ahmed S, Stanley D, An C. Eicosanoid-mediated immunity in insects. Dev Comp Immunol 2018; 83:130-143. [PMID: 29225005 DOI: 10.1016/j.dci.2017.12.005] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 12/02/2017] [Accepted: 12/07/2017] [Indexed: 06/07/2023]
Abstract
Eicosanoid is a collective term for oxygenated metabolites of C20 polyunsaturated fatty acids. As seen in mammals, eicosanoids play crucial roles in mediating various physiological processes, including immune responses, in insects. Upon microbial pathogen infection, non-self recognition signals are propagated to nearly immune effectors such as hemocytes and fat body using various immune mediators, in which eicosanoid signals act as the ultimate downstream mediator. The chemical diversity of eicosanoids may operate to mediate various immune responses. Some entomopathogenic bacteria suppress eicosanoid biosynthesis, which inhibits host insect immunity and promotes their pathogenicity. This review introduces immune responses mediated by various eicosanoids. Then it explains the cross-talks of eicosanoids with other immune mediators including cytokines, biogenic monoamines, and nitric oxide to clarify the complexity of insect immune mediation. Finally, we highlight the biological significance of eicosanoids by demonstrating bacterial pathogenicity inhibiting a key enzyme - phospholipase A2 - in eicosanoid biosynthesis using their secondary metabolites to defend host insect immune attack.
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Affiliation(s)
- Yonggyun Kim
- Department of Plant Medicals, College of Natural Sciences, Andong National University, Andong 36729, Republic of Korea.
| | - Shabbir Ahmed
- Department of Plant Medicals, College of Natural Sciences, Andong National University, Andong 36729, Republic of Korea
| | - David Stanley
- USDA- ARS, Biological Control of Insects Research Laboratory, 1503 S. Providence Road, Columbia MO 65203, USA
| | - Chunju An
- Department of Entomology, China Agricultural University, Beijing 100193, China
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108
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Ghorani V, Marefati N, Shakeri F, Rezaee R, Boskabady M, Boskabady MH. The Effects of Allium Cepa Extract on Tracheal Responsiveness, Lung Inflammatory Cells and Phospholipase A2 Level in Asthmatic Rats. Iran J Allergy Asthma Immunol 2018; 17:221-231. [PMID: 29908539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Accepted: 06/10/2018] [Indexed: 06/08/2023]
Abstract
Antioxidant, antimicrobial, anti-hyperglycaemic, anti-diabetic and anti-inflammatory effects of Allium cepa (A. cepa) have been previously shown. In this study, the effects of A. cepa aqueous-alcoholic extract on tracheal responsiveness, lung inflammatory cells and phospholipase A2 (PLA2) level in bronchoalveolar fluid (BALF) of asthmatic rats were examined. Wistar rats were randomly divided into control group (C), asthmatic group (A), asthmatic group (A) treated with A. cepa extract (AC, 0.175, 0.35, and 0.7 mg/mL) and dexamethasone (D, 1.25 μg/mL). The extract of A. cepa and dexamethasone were added to animal's drinking water during sensitization period. Tracheal responsiveness to methacholine and ovalbumin, lung inflammatory cells and PLA2 level in BALF were assessed. Tracheal responsiveness to methacholine and ovalbumin, PLA2 level, total and most differential WBC count were increased but lymphocytes was decreased in asthmatic animals compared to group C (p<0.05 to p<0.001). Treatment of sensitized rats with dexamethasone and all concentrations of A. cepa lead to a significant decrease in total WBC and PLA2 level compared to asthmatic group (p<0.001). The two higher concentrations of A. cepa also significantly decreased tracheal responsiveness, neutrophil and eosinophil counts but led to a significant increase in lymphocytes count compared to asthmatic group (p<0.05 to p<0.001). Treatment of sensitized group with the highest concentration of A. cepa also significantly reduced monocyte count compared to asthmatic group (p<0.001). Anti-inflammatory and preventive effects of A. cepa on tracheal responsiveness and lung inflammation in asthmatic animals may suggest its potential therapeutic effect on airway diseases such as asthma.
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Affiliation(s)
- Vahideh Ghorani
- Pharmaciutical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran AND Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Narges Marefati
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran AND Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farzaneh Shakeri
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran AND Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ramin Rezaee
- Clinical Research Unit, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Marzie Boskabady
- Dental Materials Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran AND Department of Pediatric Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Hossein Boskabady
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran AND Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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109
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Liebscher S, Ambrose RL, Aktepe TE, Mikulasova A, Prier JE, Gillespie LK, Lopez-Denman AJ, Rupasinghe TWT, Tull D, McConville MJ, Mackenzie JM. Phospholipase A2 activity during the replication cycle of the flavivirus West Nile virus. PLoS Pathog 2018; 14:e1007029. [PMID: 29709018 PMCID: PMC5945048 DOI: 10.1371/journal.ppat.1007029] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Revised: 05/10/2018] [Accepted: 04/15/2018] [Indexed: 02/06/2023] Open
Abstract
Positive-sense RNA virus intracellular replication is intimately associated with membrane platforms that are derived from host organelles and comprised of distinct lipid composition. For flaviviruses, such as West Nile virus strain Kunjin virus (WNVKUN) we have observed that these membrane platforms are derived from the endoplasmic reticulum and are rich in (at least) cholesterol. To extend these studies and identify the cellular lipids critical for WNVKUN replication we utilized a whole cell lipidomics approach and revealed an elevation in phospholipase A2 (PLA2) activity to produce lyso-phosphatidylcholine (lyso-PChol). We observed that the PLA2 enzyme family is activated in WNVKUN-infected cells and the generated lyso-PChol lipid moieties are sequestered to the subcellular sites of viral replication. The requirement for lyso-PChol was confirmed using chemical inhibition of PLA2, where WNVKUN replication and production of infectious virus was duly affected in the presence of the inhibitors. Importantly, we could rescue chemical-induced inhibition with the exogenous addition of lyso-PChol species. Additionally, electron microscopy results indicate that lyso-PChol appears to contribute to the formation of the WNVKUN membranous replication complex (RC); particularly affecting the morphology and membrane curvature of vesicles comprising the RC. These results extend our current understanding of how flaviviruses manipulate lipid homeostasis to favour their own intracellular replication. Positive-sense RNA viruses remodel the host cytoplasmic membrane architecture to induce the formation of membranous organelles termed viral replication complexes. These complexes aid the virus in providing a more efficient microenvironment for replication but additionally shield immune-stimulatory molecules from the immune response. In this report we have performed whole cell lipidomic approaches to identify a key role for the host phospholipase A2 enzyme family in generating lyso-phospholipids to remodel cellular membranes and shape the West Nile virus (WNV) replication complex. We observed elevated PLA2 activity levels in WNV-infected cell cultures from mammalian as well as arthropod origins suggesting a generic requirement of phospholipid hydrolysis for flavivirus replication. Furthermore, we found that chemical inhibition of these enzymes severely affected the ability of WNV to replicate in cells, and we could attribute this defect to an altered ultrastructural morphology of the viral replication complex. This study provides evidence for a mechanism for the biogenesis of the flavivirus replication complex and the specific utilisation of a host lipid to invoke specific membrane curvature, generating a crucial membrane organelle required for efficient virus replication.
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Affiliation(s)
- Susann Liebscher
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Rebecca L. Ambrose
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Turgut E. Aktepe
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Andrea Mikulasova
- Department of Microbiology, La Trobe University, Melbourne, VIC, Australia
| | - Julia E. Prier
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Leah K. Gillespie
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Adam J. Lopez-Denman
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
- Department of Microbiology, La Trobe University, Melbourne, VIC, Australia
| | - Thusitha W. T. Rupasinghe
- Metabolomics Australia, Bio21 Molecular Science and Biotechnology Institute, Department of Biochemistry and Molecular Biology at University of Melbourne, Melbourne, VIC, Australia
| | - Dedreia Tull
- Metabolomics Australia, Bio21 Molecular Science and Biotechnology Institute, Department of Biochemistry and Molecular Biology at University of Melbourne, Melbourne, VIC, Australia
| | - Malcolm J. McConville
- Metabolomics Australia, Bio21 Molecular Science and Biotechnology Institute, Department of Biochemistry and Molecular Biology at University of Melbourne, Melbourne, VIC, Australia
| | - Jason M. Mackenzie
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
- * E-mail:
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110
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Lin Y, Bogdanov M, Lu S, Guan Z, Margolin W, Weiss J, Zheng L. The phospholipid-repair system LplT/Aas in Gram-negative bacteria protects the bacterial membrane envelope from host phospholipase A 2 attack. J Biol Chem 2018; 293:3386-3398. [PMID: 29348168 PMCID: PMC5836115 DOI: 10.1074/jbc.ra117.001231] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 01/15/2018] [Indexed: 11/06/2022] Open
Abstract
Secretory phospholipases A2 (sPLA2s) are potent components of mammalian innate-immunity antibacterial mechanisms. sPLA2 enzymes attack bacteria by hydrolyzing bacterial membrane phospholipids, causing membrane disorganization and cell lysis. However, most Gram-negative bacteria are naturally resistant to sPLA2 Here we report a novel resistance mechanism to mammalian sPLA2 in Escherichia coli, mediated by a phospholipid repair system consisting of the lysophospholipid transporter LplT and the acyltransferase Aas in the cytoplasmic membrane. Mutation of the lplT or aas gene abolished bacterial lysophospholipid acylation activity and drastically increased bacterial susceptibility to the combined actions of inflammatory fluid components and sPLA2, resulting in bulk phospholipid degradation and loss of colony-forming ability. sPLA2-mediated hydrolysis of the three major bacterial phospholipids exhibited distinctive kinetics and deacylation of cardiolipin to its monoacyl-derivative closely paralleled bacterial death. Characterization of the membrane envelope in lplT- or aas-knockout mutant bacteria revealed reduced membrane packing and disruption of lipid asymmetry with more phosphatidylethanolamine present in the outer leaflet of the outer membrane. Moreover, modest accumulation of lysophospholipids in these mutant bacteria destabilized the inner membrane and rendered outer membrane-depleted spheroplasts much more sensitive to sPLA2 These findings indicated that LplT/Aas inactivation perturbs both the outer and inner membranes by bypassing bacterial membrane maintenance mechanisms to trigger specific interfacial activation of sPLA2 We conclude that the LplT/Aas system is important for maintaining the integrity of the membrane envelope in Gram-negative bacteria. Our insights may help inform new therapeutic strategies to enhance host sPLA2 antimicrobial activity.
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Affiliation(s)
- Yibin Lin
- From the Center for Membrane Biology, Department of Biochemistry and Molecular Biology and
| | | | - Shuo Lu
- From the Center for Membrane Biology, Department of Biochemistry and Molecular Biology and
| | - Ziqiang Guan
- the Department of Biochemistry, Duke University School of Medicine, Durham, North Carolina 27710, and
| | - William Margolin
- Microbiology and Molecular Genetics, University of Texas McGovern Medical School, Houston, Texas 77030
| | - Jerrold Weiss
- the Inflammation Program and Departments of Internal Medicine and Microbiology, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242
| | - Lei Zheng
- From the Center for Membrane Biology, Department of Biochemistry and Molecular Biology and
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Wadsäter M, Barauskas J, Tiberg F, Nylander T. The lipolytic degradation of highly structured cubic micellar nanoparticles of soy phosphatidylcholine and glycerol dioleate by phospholipase A 2 and triacylglycerol lipase. Chem Phys Lipids 2018; 211:86-92. [PMID: 29132829 DOI: 10.1016/j.chemphyslip.2017.11.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Revised: 10/05/2017] [Accepted: 11/09/2017] [Indexed: 11/23/2022]
Abstract
The effects of different lipolytic enzymes on the structure of lipid liquid crystalline nano-particles (LCNP) have been investigated by cryogenic transmission electron microscopy (cryo-TEM) and synchrotron small angle X-ray diffraction (SAXD). Here we used highly structured cubic micellar (Fd3m) nanoparticles of 50/50 (wt%/wt%) soy phosphatidyl choline (SPC)/glycerol dioleate (GDO) as substrate. Two types of lipolytic enzymes were used, phospholipase A2 (PLA2) that catalyses degradation of the phospholipid component, SPC, and porcine pancreatic triacylglycerol lipase (TGL) that facilitate the hydrolysis of the diglyceride, GDO. Evolution of the structure was found to be very different and linked to specificity of the two types of enzymes. PLA2, which hydrolyses the lamellar forming component, SPC, induces a reversed micellar lipid phase, while TGL which hydrolysis the reverse phase forming compound, GDO, induces a lamellar phase.
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Affiliation(s)
- Maria Wadsäter
- Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-22100, Lund, Sweden.
| | - Justas Barauskas
- Camurus AB, Ideon Science Park, Gamma Building, Sölvegatan 41, SE-22379, Lund, Sweden(1); Biomedical Science, Faculty of Health and Society, Malmö University, SE-20506, Malmö, Sweden.
| | - Fredrik Tiberg
- Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-22100, Lund, Sweden; Camurus AB, Ideon Science Park, Gamma Building, Sölvegatan 41, SE-22379, Lund, Sweden(1)
| | - Tommy Nylander
- Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-22100, Lund, Sweden.
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Bond J, Tran Quang C, Hypolite G, Belhocine M, Bergon A, Cordonnier G, Ghysdael J, Macintyre E, Boissel N, Spicuglia S, Asnafi V. Novel Intergenically Spliced Chimera, NFATC3-PLA2G15, Is Associated with Aggressive T-ALL Biology and Outcome. Mol Cancer Res 2018; 16:470-475. [PMID: 29330284 DOI: 10.1158/1541-7786.mcr-17-0442] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 10/16/2017] [Accepted: 11/27/2017] [Indexed: 11/16/2022]
Abstract
Leukemias are frequently characterized by the expression of oncogenic fusion chimeras that normally arise due to chromosomal rearrangements. Intergenically spliced chimeric RNAs (ISC) are transcribed in the absence of structural genomic changes, and aberrant ISC expression is now recognized as a potential driver of cancer. To better understand these potential oncogenic drivers, high-throughput RNA sequencing was performed on T-acute lymphoblastic leukemia (T-ALL) patient specimens (n = 24), and candidate T-ALL-related ISCs were identified (n = 55; a median of 4/patient). In-depth characterization of the NFATC3-PLA2G15 chimera, which was variably expressed in primary T-ALL, was performed. Functional assessment revealed that the fusion had lower activity than wild-type NFATC3 in vitro, and T-ALLs with elevated NFATC3-PLA2G15 levels had reduced transcription of canonical NFAT pathway genes in vivo Strikingly, high expression of the NFATC3-PLA2G15 chimera correlated with aggressive disease biology in murine patient-derived T-ALL xenografts, and poor prognosis in human T-ALL patients. Mol Cancer Res; 16(3); 470-5. ©2018 AACR.
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Affiliation(s)
- Jonathan Bond
- Université Paris Descartes Sorbonne Cité, Institut Necker-Enfants Malades (INEM), Institut National de Recherche Médicale (INSERM) U1151, and Laboratory of Onco-Haematology, Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Necker Enfants-Malades, Paris, France.
| | - Christine Tran Quang
- Institut Curie, PSL Research University, CNRS UMR 3348, Orsay, France
- Université Paris Sud, Université Paris-Saclay, CNRS UMR 3348, Orsay, France
| | - Guillaume Hypolite
- Université Paris Descartes Sorbonne Cité, Institut Necker-Enfants Malades (INEM), Institut National de Recherche Médicale (INSERM) U1151, and Laboratory of Onco-Haematology, Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Necker Enfants-Malades, Paris, France
| | - Mohamed Belhocine
- Technological Advances for Genomics and Clinics (TAGC), INSERM U1090, Aix-Marseille University UMR-S 1090, Marseille, France
| | - Aurélie Bergon
- Technological Advances for Genomics and Clinics (TAGC), INSERM U1090, Aix-Marseille University UMR-S 1090, Marseille, France
| | - Gaëlle Cordonnier
- Université Paris Descartes Sorbonne Cité, Institut Necker-Enfants Malades (INEM), Institut National de Recherche Médicale (INSERM) U1151, and Laboratory of Onco-Haematology, Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Necker Enfants-Malades, Paris, France
| | - Jacques Ghysdael
- Institut Curie, PSL Research University, CNRS UMR 3348, Orsay, France
- Université Paris Sud, Université Paris-Saclay, CNRS UMR 3348, Orsay, France
| | - Elizabeth Macintyre
- Université Paris Descartes Sorbonne Cité, Institut Necker-Enfants Malades (INEM), Institut National de Recherche Médicale (INSERM) U1151, and Laboratory of Onco-Haematology, Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Necker Enfants-Malades, Paris, France
| | - Nicolas Boissel
- Université Paris Diderot, Institut Universitaire d'Hématologie, EA-3518, Assistance Publique-Hôpitaux de Paris, University Hospital Saint-Louis, Paris, France
| | - Salvatore Spicuglia
- Technological Advances for Genomics and Clinics (TAGC), INSERM U1090, Aix-Marseille University UMR-S 1090, Marseille, France
| | - Vahid Asnafi
- Université Paris Descartes Sorbonne Cité, Institut Necker-Enfants Malades (INEM), Institut National de Recherche Médicale (INSERM) U1151, and Laboratory of Onco-Haematology, Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Necker Enfants-Malades, Paris, France.
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Wang Y, Zhang J, Zhang D, Xiao H, Xiong S, Huang C. Exploration of the Inhibitory Potential of Varespladib for Snakebite Envenomation. Molecules 2018; 23:molecules23020391. [PMID: 29439513 PMCID: PMC6017252 DOI: 10.3390/molecules23020391] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 02/08/2018] [Accepted: 02/09/2018] [Indexed: 11/22/2022] Open
Abstract
Phospholipase A2s (PLA2) is a major component of snake venom with diverse pathologic toxicities and, therefore, a potential target for antivenom therapy. Varespladib was initially designed as an inhibitor of mammal PLA2s, and was recently repurposed to a broad-spectrum inhibitor of PLA2 in snake venom. To evaluate the protective abilities of varespladib to hemorrhage, myonecrosis, and systemic toxicities that are inflicted by different crude snake venoms, subcutaneous ecchymosis, muscle damage, and biochemical variation in serum enzymes derived from the envenomed mice were determined, respectively. Varespladib treatment showed a significant inhibitory effect to snake venom PLA2, which was estimated by IC50 in vitro and ED50 in vivo. In animal models, the severely hemorrhagic toxicity of D. acutus and A. halys venom was almost fully inhibited after administration of varespladib. Moreover, signs of edema in gastrocnemius muscle were remarkably attenuated by administration of varespladib, with a reduced loss of myonecrosis and desmin. Serum levels of creatine kinase, lactate dehydrogenase isoenzyme 1, aspartate transaminase, and alanine transaminase were down-regulated after treatment with varespladib, which indicated the protection to viscera injury. In conclusion, varespladib may be a potential first-line drug candidate in snakebite envenomation first aid or clinical therapy.
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Affiliation(s)
- Yiding Wang
- School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China.
| | - Jing Zhang
- School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China.
| | - Denghong Zhang
- School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China.
| | - Huixiang Xiao
- School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China.
| | - Shengwei Xiong
- School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China.
| | - Chunhong Huang
- School of Basic Medical Sciences, Nanchang University, Nanchang 330006, China.
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114
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Goldenberg J, Cipriani V, Jackson TNW, Arbuckle K, Debono J, Dashevsky D, Panagides N, Ikonomopoulou MP, Koludarov I, Li B, Santana RC, Nouwens A, Jones A, Hay C, Dunstan N, Allen L, Bush B, Miles JJ, Ge L, Kwok HF, Fry BG. Proteomic and functional variation within black snake venoms (Elapidae: Pseudechis). Comp Biochem Physiol C Toxicol Pharmacol 2018; 205:53-61. [PMID: 29353015 DOI: 10.1016/j.cbpc.2018.01.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 01/03/2018] [Accepted: 01/10/2018] [Indexed: 10/18/2022]
Abstract
Pseudechis (black snakes) is an Australasian elapid snake genus that inhabits much of mainland Australia, with two representatives confined to Papua New Guinea. The present study is the first to analyse the venom of all 9 described Pseudechis species (plus one undescribed species) to investigate the evolution of venom composition and functional activity. Proteomic results demonstrated that the typical Pseudechis venom profile is dominated by phospholipase A2 toxins. Strong cytotoxicity was the dominant function for most species. P. porphyriacus, the most basal member of the genus, also exhibited the most divergent venom composition, being the only species with appreciable amounts of procoagulant toxins. The relatively high presence of factor Xa recovered in P. porphyriacus venom may be related to a predominantly amphibian diet. Results of this study provide important insights to guide future ecological and toxinological investigations.
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Affiliation(s)
- Jonathan Goldenberg
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia; Evolution and Optics of Nanostructures Group, Department of Biology, University of Ghent, Ledeganckstraat 35, Ghent 9000, Belgium
| | - Vittoria Cipriani
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Timothy N W Jackson
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia; Australian Venom Research Unit, Department of Pharmacology, University of Melbourne, Parkville, VIC 3000, Australia
| | - Kevin Arbuckle
- Department of Biosciences, College of Science, Swansea University, Swansea SA2, 8PP, UK
| | - Jordan Debono
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Daniel Dashevsky
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Nadya Panagides
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Maria P Ikonomopoulou
- QIMR Berghofer Institute of Medical Research, Herston, QLD 4049, Australia; School of Medicine, The University of Queensland, Herston, QLD 4002, Australia; Madrid Institute for Advanced Studies (IMDEA) in Food, CEI UAM+CSIC, Madrid 28049, Spain
| | - Ivan Koludarov
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Bin Li
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau, China
| | - Renan Castro Santana
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Amanda Nouwens
- School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Alun Jones
- Institute for Molecular Biosciences, University of Queensland, Slt Lucia, QLD 4072, Australia
| | - Chris Hay
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | | | - Luke Allen
- Venom Supplies, Tanunda, SA 5352, Australia
| | - Brian Bush
- Snakes Harmful & Harmless, 9 Birch Place, Stoneville, WA 6081, Australia
| | - John J Miles
- QIMR Berghofer Institute of Medical Research, Herston, QLD 4049, Australia; Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, QLD 4878, Australia
| | - Lilin Ge
- School of Pharmacy, Nanjing University of Chinese Medicine, Qixia District, Nanjing, China
| | - Hang Fai Kwok
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau, China.
| | - Bryan G Fry
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia.
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115
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Dobson J, Yang DC, Op den Brouw B, Cochran C, Huynh T, Kurrupu S, Sánchez EE, Massey DJ, Baumann K, Jackson TNW, Nouwens A, Josh P, Neri-Castro E, Alagón A, Hodgson WC, Fry BG. Rattling the border wall: Pathophysiological implications of functional and proteomic venom variation between Mexican and US subspecies of the desert rattlesnake Crotalus scutulatus. Comp Biochem Physiol C Toxicol Pharmacol 2018; 205:62-69. [PMID: 29074260 PMCID: PMC5825281 DOI: 10.1016/j.cbpc.2017.10.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2017] [Revised: 10/19/2017] [Accepted: 10/19/2017] [Indexed: 12/11/2022]
Abstract
While some US populations of the Mohave rattlesnake (Crotalus scutulatus scutulatus) are infamous for being potently neurotoxic, the Mexican subspecies C. s. salvini (Huamantlan rattlesnake) has been largely unstudied beyond crude lethality testing upon mice. In this study we show that at least some populations of this snake are as potently neurotoxic as its northern cousin. Testing of the Mexican antivenom Antivipmyn showed a complete lack of neutralisation for the neurotoxic effects of C. s. salvini venom, while the neurotoxic effects of the US subspecies C. s. scutulatus were time-delayed but ultimately not eliminated. These results document unrecognised potent neurological effects of a Mexican snake and highlight the medical importance of this subspecies, a finding augmented by the ineffectiveness of the Antivipmyn antivenom. These results also influence our understanding of the venom evolution of Crotalus scutulatus, suggesting that neurotoxicity is the ancestral feature of this species, with the US populations which lack neurotoxicity being derived states.
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Affiliation(s)
- James Dobson
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Daryl C Yang
- Department of Pharmacology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Bianca Op den Brouw
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Chip Cochran
- Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, CA 92350, USA
| | - Tam Huynh
- Department of Pharmacology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Sanjaya Kurrupu
- Department of Pharmacology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Elda E Sánchez
- National Natural Toxins Research Center (NNTRC), Department of Chemistry, Texas A&M University-Kingsville, MSC 224, 975 West Avenue B, Kingsville, TX 78363, USA
| | - Daniel J Massey
- Arizona Poison and Drug Information Center, 1295 N Martin Room B308, Tucson, AZ 85721, USA; Banner University Medical Center, 1501 N. Campbell Ave, Tucson, AZ 85745, USA
| | - Kate Baumann
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Timothy N W Jackson
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia; Australian Venom Research Unit, Department of Pharmacology, University of Melbourne, Parkville, Victoria 3000, Australia
| | - Amanda Nouwens
- School of Chemistry and Molecular Biology, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Peter Josh
- School of Chemistry and Molecular Biology, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Edgar Neri-Castro
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, Mexico
| | - Alejandro Alagón
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, Mexico
| | - Wayne C Hodgson
- Department of Pharmacology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Bryan G Fry
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia.
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116
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Schreiber R, Ousingsawat J, Wanitchakool P, Sirianant L, Benedetto R, Reiss K, Kunzelmann K. Regulation of TMEM16A/ANO1 and TMEM16F/ANO6 ion currents and phospholipid scrambling by Ca 2+ and plasma membrane lipid. J Physiol 2018; 596:217-229. [PMID: 29134661 PMCID: PMC5767690 DOI: 10.1113/jp275175] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 11/08/2017] [Indexed: 12/12/2022] Open
Abstract
KEY POINTS TMEM16 proteins can operate as Ca2+ -activated Cl- channels or scramble membrane phospholipids, which are both highly relevant mechanisms during disease. Overexpression of TMEM16A and TMEM16F were found to be partially active at 37°C and at resting intracellular Ca2+ concentrations. We show that TMEM16 Cl- currents and phospholipid scrambling can be activated by modification of plasma membrane phospholipids, through reactive oxygen species and phospholipase A2. While phospholipids and Cl- ions are likely to use the same pore within TMEM16F, TMEM16A only conducts Cl- ions. Lipid regulation of TMEM16 proteins is highly relevant during inflammation and regulated cell death such as apoptosis and ferroptosis. ABSTRACT TMEM16/anoctamin (ANO) proteins form Ca2+ -activated ion channels or phospholipid scramblases. We found that both TMEM16A/ANO1 and TMEM16F/ANO6 produced Cl- currents when activated by intracellular Ca2+ , but only TMEM16F was able to expose phosphatidylserine to the outer leaflet of the plasma membrane. Mutations within TMEM16F or TMEM16A/F chimeras similarly changed Cl- currents and phospholipid scrambling, suggesting the same intramolecular pathway for Cl- and phospholipids. When overexpressed, TMEM16A and TMEM16F produced spontaneous Cl- currents at 37°C even at resting intracellular Ca2+ levels, which was abolished by inhibition of phospholipase A2 (PLA2 ). Connversely, activation of PLA2 or application of active PLA2 , as well as lipid peroxidation induced by reactive oxygen species (ROS) using staurosporine or tert-butyl hydroperoxide, enhanced ion currents by TMEM16A/F and in addition activated phospholipid scrambling by TMEM16F. Thus, TMEM16 proteins are activated by an increase in intracellular Ca2+ , or independent of intracellular Ca2+ , by modifications occurring in plasma and intracellular membrane phospholipids. These results may help to explain why regions distant to the TMEM16 pore and the Ca2+ binding sites control Cl- currents and phospholipid scrambling. Regulation of TMEM16 proteins through modification of membrane phospholipids occurs during regulated cell death such as apoptosis and ferroptosis. It contributes to inflammatory and nerve injury-induced hypersensitivity and generation of pain and therefore provides a regulatory mechanism that is particularly relevant during disease.
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Affiliation(s)
- Rainer Schreiber
- Institut für PhysiologieUniversität RegensburgUniversitätsstraße 31D‐93053RegensburgGermany
| | - Jiraporn Ousingsawat
- Institut für PhysiologieUniversität RegensburgUniversitätsstraße 31D‐93053RegensburgGermany
| | | | - Lalida Sirianant
- Institut für PhysiologieUniversität RegensburgUniversitätsstraße 31D‐93053RegensburgGermany
| | - Roberta Benedetto
- Institut für PhysiologieUniversität RegensburgUniversitätsstraße 31D‐93053RegensburgGermany
| | - Karina Reiss
- Department of DermatologyUniversity of KielSchittenhelmstrasse 7Kiel24105Germany
| | - Karl Kunzelmann
- Institut für PhysiologieUniversität RegensburgUniversitätsstraße 31D‐93053RegensburgGermany
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117
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Abstract
Hybrid vesicles, comprising blends of amphiphilic block copolymers and phospholipids, have attracted significant attention recently because of their unique combination of chemical and physical properties. We report a method to make unilamellar hybrid vesicles with diameters of 100 nm by mixing polybutadiene-block-poly(ethylene oxide) and phosphocholine lipids using a combination of solvent inversion and sonication. We show that homogeneous hybrid vesicles are formed when one component is a minor fraction. At compositions with balanced mass fractions, separate populations of similarly sized pure liposomes and hybrid vesicles are indicated. We investigate the release kinetics of calcein encapsulated in the lumen as hybrid large and giant unilamellar vesicles (LUVs and GUVs) of different compositions are exposed to phospholipase A2 (PLA2). PLA2 hydrolyzes lipids, which leads to dissolution of lipid domains and provides a trigger for the release of calcein as pores are formed. We demonstrate that depending on the polymer mole fraction, block copolymers can either protect or boost the rate of lipid degradation and thereby the release rate from nanoscale hybrid vesicles. Strong indications of lipid phase separation into nanoscale domains in LUVs are observed. Most importantly, hybrid GUV with lipids in the fluid phase release calcein slowly as lipids in the liquid-disordered phase do not phase-separate, but they show the fastest release of all blends as LUVs. This indicates phase separation on the nanoscale in contrast to on the microscale, but it also indicates retained high mobility of lipids between the nanoscale domains, which is absent for lipids in the gel phase. Our results demonstrate several ways in which nanoscale hybrid vesicles can and should be optimized for PLA2-triggered release of water-soluble compounds.
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Affiliation(s)
- Mudassar Mumtaz Virk
- Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna , Muthgasse 11, 1190 Vienna, Austria
| | - Erik Reimhult
- Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna , Muthgasse 11, 1190 Vienna, Austria
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118
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Bernacchioni C, Cencetti F, Ouro A, Bruno M, Gomez-Muñoz A, Donati C, Bruni P. Lysophosphatidic Acid Signaling Axis Mediates Ceramide 1-Phosphate-Induced Proliferation of C2C12 Myoblasts. Int J Mol Sci 2018; 19:ijms19010139. [PMID: 29300303 PMCID: PMC5796088 DOI: 10.3390/ijms19010139] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 12/23/2017] [Accepted: 12/28/2017] [Indexed: 02/07/2023] Open
Abstract
Sphingolipids are not only crucial for membrane architecture but act as critical regulators of cell functions. The bioactive sphingolipid ceramide 1-phosphate (C1P), generated by the action of ceramide kinase, has been reported to stimulate cell proliferation, cell migration and to regulate inflammatory responses via activation of different signaling pathways. We have previously shown that skeletal muscle is a tissue target for C1P since the phosphosphingolipid plays a positive role in myoblast proliferation implying a role in muscle regeneration. Skeletal muscle displays strong capacity of regeneration thanks to the presence of quiescent adult stem cells called satellite cells that upon trauma enter into the cell cycle and start proliferating. However, at present, the exact molecular mechanism by which C1P triggers its mitogenic effect in myoblasts is lacking. Here, we report for the first time that C1P stimulates C2C12 myoblast proliferation via lysophosphatidic acid (LPA) signaling axis. Indeed, C1P subsequently to phospholipase A2 activation leads to LPA1 and LPA3 engagement, which in turn drive Akt (protein kinase B) and ERK1/2 (extracellular signal-regulated kinases 1/2) activation, thus stimulating DNA synthesis. The present findings shed new light on the key role of bioactive sphingolipids in skeletal muscle and provide further support to the notion that these pleiotropic molecules might be useful therapeutic targets for skeletal muscle regeneration.
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Affiliation(s)
- Caterina Bernacchioni
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale GB Morgagni 50, 50134 Firenze, Italy.
- Istituto Interuniversitario di Miologia (IIM), Italy.
| | - Francesca Cencetti
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale GB Morgagni 50, 50134 Firenze, Italy.
- Istituto Interuniversitario di Miologia (IIM), Italy.
| | - Alberto Ouro
- Department of Biochemistry and Molecular Biology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48080 Bilbao, Spain.
- Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel.
| | - Marina Bruno
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale GB Morgagni 50, 50134 Firenze, Italy.
| | - Antonio Gomez-Muñoz
- Department of Biochemistry and Molecular Biology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48080 Bilbao, Spain.
| | - Chiara Donati
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale GB Morgagni 50, 50134 Firenze, Italy.
- Istituto Interuniversitario di Miologia (IIM), Italy.
| | - Paola Bruni
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Viale GB Morgagni 50, 50134 Firenze, Italy.
- Istituto Interuniversitario di Miologia (IIM), Italy.
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Smichi N, Achouri N, Noiriel A, Arondel V, Abousalham A, Gargouri Y, Miled N, Fendri A. Heterologous Expression and Functional Characterization of Sparidae Fish Digestive Phospholipase A 2. Methods Mol Biol 2018; 1835:179-189. [PMID: 30109652 DOI: 10.1007/978-1-4939-8672-9_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, we have produced for the first time a fish phospholipase (PLA2) in heterologous system (E. coli). The Diplodus annularis PLA2 (DaPLA2) was then refolded from inclusion bodies and purified by Ni-affinity chromatography. We used the pH-stat method (with emulsified phosphatidylcholine as substrate) and the monomolecular film technique (using various glycerophospholipids substrates spread in the form of monomolecular films at the air-water interface) to access the biochemical and kinetic properties of the recombinant DaPLA2. The DaPLA2 was found to be active and stable at higher temperatures (37-50 °C) than expected. Interestingly, DaPLA2 hydrolyzes efficiently both purified phosphatidylglycerol and phosphatidylethanolamine at 20 mN/m. These analytical results corroborate with the fact that the catalytic activity of DaPLA2, measured with the pH-stat using egg yolk as substrate, is mainly due to the hydrolysis of the PE fraction present in egg yolk, whereas the phosphatidylglycerol is a hallmark substrate for the most secreted PLA2-IB.
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Affiliation(s)
- Nabil Smichi
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS, University of Sfax, Sfax, Tunisia.
| | - Neila Achouri
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS, University of Sfax, Sfax, Tunisia
| | - Alexandre Noiriel
- Métabolisme, Enzymes et Mécanismes Moléculaires (MEM2), Univ Lyon, Université Lyon 1, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, UMR 5246 CNRS, Villeurbanne Cedex, France
| | - Vincent Arondel
- Laboratoire de Biogenèse Membranaire, CNRS, UMR 5200, INRA Bordeaux Aquitaine, BP81, Villenave d'Ornon Cedex, Bordeaux, France
| | - Abdelkarim Abousalham
- Métabolisme, Enzymes et Mécanismes Moléculaires (MEM2), Univ Lyon, Université Lyon 1, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, UMR 5246 CNRS, Villeurbanne Cedex, France
| | - Youssef Gargouri
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS, University of Sfax, Sfax, Tunisia
| | - Nabil Miled
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS, University of Sfax, Sfax, Tunisia
| | - Ahmed Fendri
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS, University of Sfax, Sfax, Tunisia
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Bate C, Williams A. Monomeric amyloid-β reduced amyloid-β oligomer-induced synapse damage in neuronal cultures. Neurobiol Dis 2017; 111:48-58. [PMID: 29272738 DOI: 10.1016/j.nbd.2017.12.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 11/12/2017] [Accepted: 12/12/2017] [Indexed: 12/25/2022] Open
Abstract
Alzheimer's disease is a progressive neurodegenerative disease characterized by the accumulation of amyloid-β (Aβ) in the brain. Aβ oligomers are believed to cause synapse damage resulting in the memory deficits that are characteristic of this disease. Since the loss of synaptic proteins in the brain correlates closely with the degree of dementia in Alzheimer's disease, the process of Aβ-induced synapse damage was investigated in cultured neurons by measuring the loss of synaptic proteins. Soluble Aβ oligomers, derived from Alzheimer's-affected brains, caused the loss of cysteine string protein and synaptophysin from neurons. When applied to synaptosomes Aβ oligomers increased cholesterol concentrations and caused aberrant activation of cytoplasmic phospholipase A2 (cPLA2). In contrast, Aβ monomer preparations did not affect cholesterol concentrations or activate synaptic cPLA2, nor did they damage synapses. The Aβ oligomer-induced aggregation of cellular prion proteins (PrPC) at synapses triggered the activation of cPLA2 that leads to synapse degeneration. Critically, Aβ monomer preparations did not cause the aggregation of PrPC; rather they reduced the Aβ oligomer-induced aggregation of PrPC. The presence of Aβ monomer preparations also inhibited the Aβ oligomer-induced increase in cholesterol concentrations and activation of cPLA2 in synaptosomes and protected neurons against the Aβ oligomer-induced synapse damage. These results support the hypothesis that Aβ monomers are neuroprotective. We hypothesise that synapse damage may result from a pathological Aβ monomer:oligomer ratio rather than the total concentrations of Aβ within the brain.
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Affiliation(s)
- Clive Bate
- Department of Pathology and Pathogen Biology, Royal Veterinary College, Hawkshead Lane, North Mymms, Herts AL9 7TA, UK.
| | - Alun Williams
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, UK.
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Sampaio LS, da Silva PA, Ribeiro VS, Castro-Chaves C, Lara LS, Vieyra A, Einicker-Lamas M. Bioactive lipids are altered in the kidney of chronic undernourished rats: is there any correlation with the progression of prevalent nephropathies? Lipids Health Dis 2017; 16:245. [PMID: 29246161 PMCID: PMC5732436 DOI: 10.1186/s12944-017-0634-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 12/03/2017] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Undernutrition during childhood leads to chronic diseases in adult life including hypertension, diabetes and chronic kidney disease. Here we explore the hypothesis that physiological alterations in the bioactive lipids pattern within kidney tissue might be involved in the progression of chronic kidney disease. METHODS Membrane fractions from kidney homogenates of undernourished rats (RBD) were submitted to lipid extraction and analysis by thin layer chromatography and cholesterol determination. RESULTS Kidneys from RBD rats had 25% lower cholesterol content, which disturb membrane microdomains, affecting Ca2+ homeostasis and the enzymes responsible for important lipid mediators such as phosphatidylinositol-4 kinase, sphingosine kinase, diacylglicerol kinase and phospholipase A2. We observed a decrease in phosphatidylinositol(4)-phosphate (8.8 ± 0.9 vs. 3.6 ± 0.7 pmol.mg-1.mim-1), and an increase in phosphatidic acid (2.2 ± 0.8 vs. 3.8 ± 1.3 pmol.mg-1.mim-1), being these lipid mediators involved in the regulation of key renal functions. Ceramide levels are augmented in kidney tissue from RBD rats (18.7 ± 1.4 vs. 21.7 ± 1.5 fmol.mg-1.min-1) indicating an ongoing renal lesion. CONCLUSION Results point to an imbalance in the bioactive lipid generation with further consequences to key events related to kidney function, thus contributing to the establishment of chronic kidney disease.
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Affiliation(s)
- Luzia S Sampaio
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil
| | - Paulo A da Silva
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil
- Programa de Pós-Graduação em Biomedicina Translacional, Universidade do Grande Rio, Duque de Caxias, RJ, Brazil
| | | | | | - Lucienne S Lara
- Instituto de Ciências Biomédicas, UFRJ, Rio de Janeiro, RJ, Brazil
| | - Adalberto Vieyra
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil
- Programa de Pós-Graduação em Biomedicina Translacional, Universidade do Grande Rio, Duque de Caxias, RJ, Brazil
- Centro Nacional de Biologia Estrutural e Bioimagem (CENABIO), UFRJ, Rio de Janeiro, Brazil
| | - M Einicker-Lamas
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil.
- Present Address: Laboratório de Biomembranas, Sala G1-037, Bloco G, Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Ilha do Fundão, Rio de Janeiro, RJ, 21941-902, Brazil.
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Neale V, Sotillo J, Seymour JE, Wilson D. The Venom of the Spine-Bellied Sea Snake (Hydrophis curtus): Proteome, Toxin Diversity and Intraspecific Variation. Int J Mol Sci 2017; 18:ijms18122695. [PMID: 29231898 PMCID: PMC5751296 DOI: 10.3390/ijms18122695] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 11/26/2017] [Accepted: 11/27/2017] [Indexed: 11/19/2022] Open
Abstract
The spine-bellied sea snake (Hydrophis curtus) is known to cause human deaths, yet its venom composition has not yet been proteomically characterised. An in-depth proteomic analysis was performed on H. curtus venom from two different seasons, January and June, corresponding to adults and subadults, respectively. Venoms from adult and subadult H. curtus individuals were compared using reversed-phase high-performance liquid chromatography (RP-HPLC), matrix-assisted laser desorption ionisation-time of flight (MALDI-TOF) mass spectrometry and liquid chromatography electrospray ionisation mass spectrometry (LC-ESI-MS) to detect intraspecific variation, and the molecular weight data obtained with ESI-MS were used to assess toxin diversity. RP-HPLC and LC-ESI-MS/MS were used to characterise the venom proteome and estimate the relative abundances of protein families present. The most abundant protein family in January and June venoms is phospholipase A2 (PLA2: January 66.7%; June 54.5%), followed by three-finger toxins (3FTx: January 30.4%; June 40.4%) and a minor component of cysteine-rich secretory proteins (CRISP: January 2.5%; June 5%). Trace amounts of snake venom metalloproteinases (SVMP), C-type lectins and housekeeping and regulatory proteins were also found. Although the complexity of the venom is low by number of families present, each family contained a more diverse set of isoforms than previously reported, a finding that may have implications for the development of next-generation sea snake antivenoms. Intraspecific variability was shown to be minor with one obvious exception of a 14,157-Da protein that was present in some January (adult) venoms, but not at all in June (subadult) venoms. There is also a greater abundance of short-chain neurotoxins in June (subadult) venom compared with January (adult) venom. These differences potentially indicate the presence of seasonal, ontogenetic or sexual variation in H. curtus venom.
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Affiliation(s)
- Vanessa Neale
- College of Public Health, Medical and Veterinary Sciences, James Cook University, McGregor Road, Smithfield, Cairns 4878, Australia.
- Australian Institute of Tropical Health and Medicine (AITHM) and Centre for Biodiscovery and Molecular Development of Therapeutics (CBMDT), James Cook University, McGregor Road, Smithfield, Cairns 4878, Australia.
| | - Javier Sotillo
- Australian Institute of Tropical Health and Medicine (AITHM) and Centre for Biodiscovery and Molecular Development of Therapeutics (CBMDT), James Cook University, McGregor Road, Smithfield, Cairns 4878, Australia.
| | - Jamie E Seymour
- Australian Institute of Tropical Health and Medicine (AITHM) and Centre for Biodiscovery and Molecular Development of Therapeutics (CBMDT), James Cook University, McGregor Road, Smithfield, Cairns 4878, Australia.
| | - David Wilson
- Australian Institute of Tropical Health and Medicine (AITHM) and Centre for Biodiscovery and Molecular Development of Therapeutics (CBMDT), James Cook University, McGregor Road, Smithfield, Cairns 4878, Australia.
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Sadekuzzaman M, Gautam N, Kim Y. A novel calcium-independent phospholipase A 2 and its physiological roles in development and immunity of a lepidopteran insect, Spodoptera exigua. Dev Comp Immunol 2017; 77:210-220. [PMID: 28851514 DOI: 10.1016/j.dci.2017.08.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 08/23/2017] [Accepted: 08/23/2017] [Indexed: 06/07/2023]
Abstract
Phospholipase A2 (PLA2) catalyzes hydrolysis of ester linkage at sn-2 position of phospholipids. At least 15 groups (I-XV) of PLA2 gene superfamily are associated with various physiological processes such as digestion, secretion, immunity, and maintenance of membrane integrity. This study suggests that various insects encode putative Group VI PLA2s representing intracellular and calcium-independent PLA2s (iPLA2). These insect iPLA2s are separated into at least two subgroups: iPLA2A (Group VIA-like) and iPLA2B (non-Group VIA). Most insects encode genes of iPLA2B type, although their biological functions are currently unknown. This study predicted a novel iPLA2 from Spodoptera exigua (a lepidopteran insect) (SeiPLA2B) and analyzed its physiological functions by RNA interference (RNAi). SeiPLA2B encodes 336 amino acid sequence with a predicted size of about 36.6 kDa and an isoelectric point at pH 8.61. It possesses a lipase catalytic site, but does not have ankyrin repeats in the amino terminal region. Phylogenetic analysis indicated that SeiPLA2B was clustered with other Group VI iPLA2s, in which SeiPLA2B was closely associated with Group VIF gene while SeiPLA2A was closely related to Group VIA gene. SeiPLA2B was expressed in all developmental stages of S. exigua. In larval stage, SeiPLA2B was expressed in fat body, hemocyte, and epidermis, but not in digestive tract. SeiPLA2B RNAi significantly reduced PLA2 enzyme activities and resulted in developmental retardation and immunosuppression. Though RNAi treatment did not significantly change fatty acid composition in fat body lipids, it significantly increased lipid peroxidation. Taken together, our results suggest that SeiPLA2B plays important roles in the development and immunity of S. exigua.
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Affiliation(s)
- Md Sadekuzzaman
- Department of Bio-Sciences, Andong National University, Andong 36729, Republic of Korea
| | - Neelam Gautam
- Department of Bio-Sciences, Andong National University, Andong 36729, Republic of Korea
| | - Yonggyun Kim
- Department of Bio-Sciences, Andong National University, Andong 36729, Republic of Korea.
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Lopes Pires ME, Clarke SR, Marcondes S, Gibbins JM. Lipopolysaccharide potentiates platelet responses via toll-like receptor 4-stimulated Akt-Erk-PLA2 signalling. PLoS One 2017; 12:e0186981. [PMID: 29136006 PMCID: PMC5685579 DOI: 10.1371/journal.pone.0186981] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 10/11/2017] [Indexed: 02/06/2023] Open
Abstract
Lipopolysaccharide (LPS) from the cell envelope of Gram-negative bacteria is a principal cause of the symptoms of sepsis. LPS has been reported to modulate the function of platelets although the underlying mechanisms of LPS action in these cells remain unclear. Platelets express the Toll-like receptor 4 (TLR4) which serves as a receptor for LPS, although the potential role of TLR4 and associated cell signalling in controlling platelet responses to LPS has not been extensively explored. In this study, we therefore investigated the actions of LPS prepared from different strains of Escherichia coli on platelet function, the underlying signalling mechanisms, and the potential role of TLR4 in orchestrating these. We report that LPS increased the aggregation of washed platelets stimulated by thromboxane (U46619) or GPVI collagen receptor agonists, effects that were prevented by a TLR4 antagonist. Associated with this, LPS enhanced fibrinogen binding, P-selectin exposure and reactive oxygen species (ROS) release. Increase of ROS was found to be important for the actions of LPS on platelets, since these were inhibited in the presence of superoxide dismutase or catalase. The effects of LPS were associated with phosphorylation of Akt, ERK1/2 and PLA2 in stimulated platelets, and inhibitors of PI3-kinase, Akt and ERK1/2 reduced significantly LPS enhanced platelet function and associated ROS production. Furthermore, inhibition of platelet cyclooxygenase or the thromboxane receptor, revealed an important role for thromboxane A2. We therefore conclude that LPS increases human platelet activation through a TLR4-PI3K-Akt-ERK1/2-PLA2 -dependent pathway that is dependent on ROS and TXA2 formation.
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Affiliation(s)
- Maria E. Lopes Pires
- School of Biological Science, Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, Berkshire, United Kingdom
| | - Simon R. Clarke
- School of Biological Science, Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, Berkshire, United Kingdom
| | - Sisi Marcondes
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Jonathan M. Gibbins
- School of Biological Science, Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, Berkshire, United Kingdom
- * E-mail:
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Han GD, Na J, Chun YS, Kumar S, Kim W, Kim Y. Chlorine dioxide enhances lipid peroxidation through inhibiting calcium-independent cellular PLA 2 in larvae of the Indianmeal moth, Plodia interpunctella. Pestic Biochem Physiol 2017; 143:48-56. [PMID: 29183610 DOI: 10.1016/j.pestbp.2017.09.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 09/15/2017] [Accepted: 09/16/2017] [Indexed: 06/07/2023]
Abstract
Polyunsaturated fatty acids usually undergo lipid peroxidation induced by reactive oxygen species (ROS). Calcium-independent cellular phospholipase A2 (iPLA2) can maintain fatty acid compositions in phospholipids depending on physiological conditions. An insect iPLA2 (Pi-iPLA2) was predicted from the transciptome of the Indianmeal moth, Plodia interpunctella. It encodes 835 amino acids. It possesses five ankyrin repeats in the N terminal and patatin lipase domain in the C terminal. Pi-iPLA2 was expressed in all developmental stages of the Indianmeal moth. In the larval stage, it was expressed in all tissues tested. RNA interference (RNAi) specific to Pi-iPLA2 was performed using specific double-stranded RNA (dsRNA). It resulted in almost 70% of reduction in gene expression. Under such RNAi condition, P. interpunctella exhibited significant accumulation of lipid peroxidation based on the amount of malondialdehyde. RNAi of Pi-PLA2 expression also impaired cellular immune response of P. interpunctella. Chlorine dioxide (ClO2), an insecticidal agent by generating ROS, increased lipid peroxidation in a dose-dependent manner. However, the addition of vitamin E (an antioxidant) reduced the formation of lipid peroxidation. ClO2 treatment significantly reduced expression of Pi-iPLA2 but increased lipid peroxidation in larval fat body of P. interpunctella. Furthermore, larvae treated with dsRNA specific to Pi-iPLA2 were significantly susceptible to ClO2 treatment. These results suggest that Pi-iPLA2 plays a crucial role in repairing damaged fatty acids from phospholipids. Our results also suggest that ClO2 can elevate lipid peroxidation through inhibiting Pi-iPLA2 expression in addition to direct ROS production.
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Affiliation(s)
- Gyung Deok Han
- Department of Biosystems and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Jahyun Na
- Institute of Life Science and Natural resources, Korea University, Seoul 02841, Republic of Korea
| | - Yong Shik Chun
- Institute of Life Science and Natural resources, Korea University, Seoul 02841, Republic of Korea
| | - Sunil Kumar
- Department of Bioresource Sciences, Andong National University, Andong 36729, Republic of Korea
| | - Wook Kim
- Department of Biosystems and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
| | - Yonggyun Kim
- Department of Bioresource Sciences, Andong National University, Andong 36729, Republic of Korea.
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杨 泳, 郭 欣, 俞 志, 马 加, 刘 星, 李 丽, 肖 高, 刘 晓, 李 鑫, 沈 劲, 李 艳, 刘 睿. [Relationship between cytoplasmic phospholipase A2 and nuclear factor κB in one lung ventilation-induced lung injury in rabbits]. Nan Fang Yi Ke Da Xue Xue Bao 2017; 37:1345-1350. [PMID: 29070464 PMCID: PMC6743963 DOI: 10.3969/j.issn.1673-4254.2017.10.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To elucidate the mechanisms of up regulated expression of cytoplasmic phospholipase A2 (CPLA2) induced by one lung ventilation (OLV) by investigating the interactions between nuclear factor kappaB (NF-κB) and C-PLA2. METHODS Forty-eight healthy Japanese white rabbits were randomized into control group, solvent treatment group (group S), NF-κB inhibitor (PDTC)/solvent treatment group ( group PS), C-PLA2 inhibitor (AACOCF3)/solvent treatment group (group AS), OLV group (group O), solvent treatment plus OLV group (SO group), NFκB inhibitor (PDTC)/solvent treatment plus OLV group (group PSO) and CPLA2 inhibitor (AACOCF3)/solvent treatment plus OLV group (group ASO). ELISA was used to detect arachidonic acid (AA) content in the lung tissues, and NFκB and CPLA2 expressions were detected by Western blotting and quantitative PCR. Lung injuries were assessed based on the lung histological score, and the polymorphonuclear leukocyte count in the bronchial alveolar lavage fluid, myeloperoxidase (MPO) content in the lung tissues, and lung wet/dry weight (W/D) raito were determined. RESULTS Treatment of the rabbits with the solvent did not produce any adverse effects. OLV caused obvious lung injury in the rabbits and up regulated the expressions of CPLA2 and NFκB in the lung tissues (P<0.05). In rabbits without OLV, treatment with AACOCF3 or PDTC significantly down regulated both CPLA2 and NFκB expressions without affecting the other parameters. In rabbits with OLV, treatment with AACOCF3 or PDTC obviously lowered CPLA2 and NFκB expressions and lessened the OLV-induced lung injuries. CONCLUSION Both C-PLA2 and NF-κB play important roles and show interactions in OLV-induced lung injury in rabbits.
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Affiliation(s)
- 泳 杨
- 昆明医科大学医学机能实验中心, 云南 昆明 650500Experimental Center of Medical Function, Kunming Medical University, Kunming 650500, China
| | - 欣 郭
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
| | - 志成 俞
- 昆明医科大学医学机能实验中心, 云南 昆明 650500Experimental Center of Medical Function, Kunming Medical University, Kunming 650500, China
| | - 加庆 马
- 昆明医科大学医学机能实验中心, 云南 昆明 650500Experimental Center of Medical Function, Kunming Medical University, Kunming 650500, China
| | - 星玲 刘
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
| | - 丽莎 李
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
| | - 高鹏 肖
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
| | - 晓萌 刘
- 昆明医科大学医学机能实验中心, 云南 昆明 650500Experimental Center of Medical Function, Kunming Medical University, Kunming 650500, China
| | - 鑫楠 李
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
| | - 劲松 沈
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
| | - 艳华 李
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
| | - 睿 刘
- 云南省第一人民医院麻醉科, 云南 昆明 650032Department of Anesthesiology, The First People's Hospital of Yunnan Province, Kunming 650032, China
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Moawad AR, Fernandez MC, Scarlata E, Dodia C, Feinstein SI, Fisher AB, O'Flaherty C. Deficiency of peroxiredoxin 6 or inhibition of its phospholipase A 2 activity impair the in vitro sperm fertilizing competence in mice. Sci Rep 2017; 7:12994. [PMID: 29021631 PMCID: PMC5636886 DOI: 10.1038/s41598-017-13411-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 09/22/2017] [Indexed: 01/27/2023] Open
Abstract
Prdx6 -/- male mice are subfertile, and the deficiency or inactivation of Peroxiredoxins (PRDXs) is associated with human male infertility. We elucidate the impact of the lack of PRDX6 or inhibition of its calcium-independent phospholipase A2 (Ca2+-iPLA2) activity by MJ33 on fertilization competence of mouse spermatozoa. Sperm motility, viability, fertilization and blastocyst rates were lower in Prdx6 -/- spermatozoa than in C57BL/6J wild-type (WT) controls (p ≤ 0.05). MJ33 inhibited the PRDX6 Ca2+-iPLA2 activity and reduced these parameters in WT spermatozoa compared with controls (p ≤ 0.05). Levels of lipid peroxidation and of superoxide anion (O2•─) were higher in Prdx6 -/- than in WT spermatozoa (p ≤ 0.05). MJ33 increased the levels of lipid peroxidation and mitochondrial O2•─ production in treated versus non-treated WT spermatozoa. Acrosome reaction, binding to zona pellucida and fusion with the oolemma were lower in Prdx6 -/- capacitated spermatozoa than WT capacitated controls and lower in WT spermatozoa treated with the PRDX6 inhibitor. In conclusion, the inhibition of the PRDX6 Ca2+-iPLA2 activity promotes an oxidative stress affecting viability, motility, and the ability of mouse spermatozoa to fertilize oocytes. Thus, PRDX6 has a critical role in the protection of the mouse spermatozoon against oxidative stress to assure fertilizing competence.
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Affiliation(s)
- Adel R Moawad
- The Research Institute of the McGill University Health Centre, McGill University, Montréal, Québec, Canada
- Departments of Surgery (Urology Division), McGill University, Montréal, Québec, Canada
- Department of Theriogenology Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Maria C Fernandez
- The Research Institute of the McGill University Health Centre, McGill University, Montréal, Québec, Canada
- Departments of Surgery (Urology Division), McGill University, Montréal, Québec, Canada
| | - Eleonora Scarlata
- The Research Institute of the McGill University Health Centre, McGill University, Montréal, Québec, Canada
- Departments of Surgery (Urology Division), McGill University, Montréal, Québec, Canada
| | - Chandra Dodia
- Institute for Environmental Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Sheldon I Feinstein
- Institute for Environmental Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Aron B Fisher
- Institute for Environmental Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Cristian O'Flaherty
- The Research Institute of the McGill University Health Centre, McGill University, Montréal, Québec, Canada.
- Departments of Surgery (Urology Division), McGill University, Montréal, Québec, Canada.
- Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada.
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128
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Abstract
Since the landmark discovery of α,β-unsaturated 4-hydroxyalkenals by Esterbauer and colleagues most studies have addressed the consequences of the tendency of these lipid peroxidation products to form covalent adducts with macromolecules and modify cellular functions. Many studies describe detrimental and cytotoxic effects of 4-hydroxy-2E-nonenal (4-HNE) in myriad tissues and organs and many pathologies. Other studies similarly assigned unfavorable effects to 4-hydroxy-2E-hexenal (4-HHE) and 4-hydroxy-2E,6Z-dodecadienal (4-HDDE). Nutrient overload (e.g., hyperglycemia, hyperlipidemia) modifies lipid metabolism in cells and promotes lipid peroxidation and the generation of α,β-unsaturated 4-hydroxyalkenals. Advances glycation- and lipoxidation end products (AGEs and ALEs) have been associated with the development of insulin resistance and pancreatic beta cell dysfunction and the etiology of type 2 diabetes and its peripheral complications. Less acknowledged are genuine signaling properties of 4-hydroxyalkenals in hormetic processes that provide defense against the consequences of nutrient overload. This review addresses recent findings on such lipohormetic mechanisms that are associated with lipid peroxidation in pancreatic beta cells. This article is part of a Special Issue entitled SI: LIPID OXIDATION PRODUCTS, edited by Giuseppe Poli.
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Affiliation(s)
- Shlomo Sasson
- Institute for Drug Research, Section of Pharmacology, Diabetes Research Unit, Hebrew University Faculty of Medicine, Jerusalem 9112001, Israel.
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129
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Shu S, Xu Y, Xie L, Ouyang Y. The role of C/EBPβ phosphorylation in modulating membrane phospholipids repairing in LPS-induced human lung/bronchial epithelial cells. Gene 2017; 629:76-85. [PMID: 28760550 PMCID: PMC7125708 DOI: 10.1016/j.gene.2017.07.076] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 06/22/2017] [Accepted: 07/27/2017] [Indexed: 11/19/2022]
Abstract
Acute lung injury/acute respiratory distress syndrome (ALI/ARDS) is a common critical emergency with high mortality in clinical practice. The key mechanism of ALI/ARDS is that the excessive inflammatory response damages the integrity of alveolar and bronchial cell membrane and thus affects their basic function. Phospholipids are the main component of cell membranes. Phospholipase A2 (PLA2), which catalyzes the cleavage of membrane phospholipids, is the most important inflammatory mediator of ALI. However, clara cell secretory protein 1 (CCSP1), an endogenous PLA2 inhibitor can increase the self-defense of membrane phospholipids. Thus, CCSP1 up-regulation and PLA2 inhibition constitutes an effective method for ensuring the stability of membrane phospholipids and for the treatment of ALI/ARDS. In the present study, we developed an in vitro model of ALI via lipopolysaccharide (LPS) stimulation of a human bronchial epithelial cell line, BEAS-2B, and assessed the mRNA and protein levels of CCSP1 and PLA2 in the model cells. The results demonstrated LPS induction inhibited the transcription and protein expression of CCSP1, but only the protein level of membrane associated PLA2 was increased, suggesting that in the in vitro ALI model, abnormally regulated CCSP1 transcription plays a crucial role in the damage of cell membrane. To find out the reason that CCSP1 expression was decreased in the ALI model, we predicted, by means of bioinformatics, putative transcription factors which would bind to CCSP1 promoter, examined their background and expression, and found that a transcription factor, CCAAT/enhancer binding protein β (C/EBP β), was correlated with the transcription of CCSP1 in the in vitro ALI model, and its phosphorylation in the model was decreased. CHIP-PCR and luciferase reporter assay revealed that C/EBP β bound to CCSP1 promoter and facilitated its transcription. Therefore, we conclude that there is a C/EBP β/CCSP1/PLA2 pathway in the in vitro ALI model. The study of underlying mechanism show that the activity of C/EBP β depends on its phosphorylation:LPS stimulation reduced C/EBP β phosphorylation and suppressed the transcription of CCSP1 in BEAS-2B cells, which resulted in enhanced PLA2 and the consequent membrane damage. And further study shows that overexpression of CDK2(Cyclindependent kinase 2), promoted the phosphorylation of C/EBP β and inhibited PLA2 through the C/EBP β/CCSP1/PLA2 pathway, so as to attenuate membrane damage. The significance of this study lies in that artificial C/EBP β phosphorylation regulation may ease the membrane damage in ALI and improve membrane repair. CDK2 over-expression promotes C/EBPβ phosphorylation and improves membrane repair through C/EBPβ/CCSP/PLA2 pathway in ALI.
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Affiliation(s)
- Shiyu Shu
- Anesthesiology Department, Children's Hospital of FudanUniversity,Shanghai,201102, China.
| | - Yan Xu
- Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014,China
| | - Ling Xie
- Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014,China
| | - Yufang Ouyang
- Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014,China
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130
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Østrem RG, Parhamifar L, Pourhassan H, Clergeaud G, Nielsen OL, Kjær A, Hansen AE, Andresen TL. Secretory phospholipase A 2 responsive liposomes exhibit a potent anti-neoplastic effect in vitro, but induce unforeseen severe toxicity in vivo. J Control Release 2017; 262:212-221. [PMID: 28754610 DOI: 10.1016/j.jconrel.2017.07.031] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 06/30/2017] [Accepted: 07/24/2017] [Indexed: 01/22/2023]
Abstract
The clinical use of liposomal drug delivery vehicles is often hindered by insufficient drug release. Here we present the rational design of liposomes optimized for secretory phospholipase A2 (sPLA2) triggered drug release, and test their utility in vitro and in vivo. We hypothesized that by adjusting the level of cholesterol in anionic, unsaturated liposomes we could tune the enzyme specificity based on membrane fluidity, thus obtaining liposomes with an improved therapeutic outcome and reduced side effects. Cholesterol is generally important as a component in the membranes of liposome drug delivery systems due to its stabilizing effects in vivo. The incorporation of cholesterol in sPLA2 sensitive liposomes has not previously been possible due to reduced sPLA2 activity. However, in the present work we solved this challenge by optimizing membrane fluidity. In vitro release studies revealed enzyme specific drug release. Treatment of two different cancer cell lines with liposomal oxaliplatin revealed efficient growth inhibition compared to that of clinically used stealth liposomes. The in vivo therapeutic effect was evaluated in nude NMRI mice using the sPLA2 secreting mammary carcinoma cell line MT-3. Three days after first treatment all mice having received the novel sPLA2 sensitive liposome formulation were euthanized due to severe systemic toxicity. Thus the present study demonstrates that great caution should be implemented when utilizing sPLA2 sensitive liposomes and that the real utility can only be disclosed in vivo. The present studies have clinical implications, as sPLA2 sensitive formulations are currently undergoing clinical trials (LiPlaCis®).
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Affiliation(s)
- Ragnhild Garborg Østrem
- Technical University of Denmark, Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, Produktionstorvet, 2800 Kgs. Lyngby, Denmark
| | - Ladan Parhamifar
- Technical University of Denmark, Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, Produktionstorvet, 2800 Kgs. Lyngby, Denmark
| | - Houman Pourhassan
- Technical University of Denmark, Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, Produktionstorvet, 2800 Kgs. Lyngby, Denmark
| | - Gael Clergeaud
- Technical University of Denmark, Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, Produktionstorvet, 2800 Kgs. Lyngby, Denmark
| | - Ole Lerberg Nielsen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Ridebanevej 3, 1870 Frederiksberg C, Denmark
| | - Andreas Kjær
- Cluster for Molecular Imaging, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - Anders Elias Hansen
- Technical University of Denmark, Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, Produktionstorvet, 2800 Kgs. Lyngby, Denmark; Cluster for Molecular Imaging, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - Thomas Lars Andresen
- Technical University of Denmark, Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, Produktionstorvet, 2800 Kgs. Lyngby, Denmark.
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131
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Giurdanella G, Lazzara F, Caporarello N, Lupo G, Anfuso CD, Eandi CM, Leggio GM, Drago F, Bucolo C, Salomone S. Sulodexide prevents activation of the PLA2/COX-2/VEGF inflammatory pathway in human retinal endothelial cells by blocking the effect of AGE/RAGE. Biochem Pharmacol 2017; 142:145-154. [PMID: 28651842 DOI: 10.1016/j.bcp.2017.06.130] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 06/21/2017] [Indexed: 12/13/2022]
Abstract
Diabetic retinopathy is characterized by the breakdown of endothelial blood-retinal barrier. We tested the hypothesis that sulodexide (SDX), a highly purified glycosaminoglycan composed of 80% iduronylglycosaminoglycan sulfate and 20% dermatan sulfate, protects human retinal endothelial cells (HREC) from high glucose (HG)-induced damage, through the suppression of inflammatory ERK/cPLA2/COX-2/PGE2 pathway, by blocking the effect of advanced glycation end-products (AGEs). HREC were treated with HG (25mM) or AGEs (glycated-BSA, 2mg/ml) for 48h, with or without SDX (60μg/ml) or aflibercept (AFL, 40μg/ml), a VEGF-trap. SDX protected HREC from HG-induced damage (MTT and LDH release) and preserved their blood-retinal barrier-like properties (Trans Endothelial Electrical Resistance and junction proteins, claudin-5, VE-cadherin and occludin, immunofluorescence and immunoblot) as well as their angiogenic potential (Tube Formation Assay). Both HG and AGEs increased phosphoERK and phospho-cPLA2, an effect counteracted by SDX and, less efficiently, by AFL. Both HG and exogenous VEGF (80ng/ml) increased PGE2 release, an effect partially reverted by SDX for HG and by AFL for VEGF. Analysis of NFκB activity revealed that HG increased the abundance of p65 in the nuclear fraction (nuclear translocation), an effect entirely reverted by SDX, but only partially by AFL. SDX, AFL and SDX+AFL protected HREC even when added 24h after HG. These data show that SDX protects HREC from HG damage and suggest that it counteracts the activation of ERK/cPLA2/COX-2/PGE2 pathway by reducing AGE-related signaling and downstream NFκB activity. This mechanism, partially distinct from VEGF blockade, may contribute to the therapeutic effect of SDX.
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Affiliation(s)
- Giovanni Giurdanella
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy
| | - Francesca Lazzara
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy
| | - Nunzia Caporarello
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy
| | - Gabriella Lupo
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy
| | | | - Chiara M Eandi
- Institut de la Vision, UMRS_968 Inserm/Université Pierre et Marie Curie, Equipe 14, Paris, France; Department of Surgical Sciences, Eye Clinic, University of Torino, Torino, Italy
| | - Gian Marco Leggio
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy; Center for Research in Ocular Pharmacology - CERFO, University of Catania, Catania, Italy
| | - Filippo Drago
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy; Center for Research in Ocular Pharmacology - CERFO, University of Catania, Catania, Italy
| | - Claudio Bucolo
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy; Center for Research in Ocular Pharmacology - CERFO, University of Catania, Catania, Italy
| | - Salvatore Salomone
- Department of Biomedical and Biotechnological Sciences, School of Medicine, Catania, Italy; Center for Research in Ocular Pharmacology - CERFO, University of Catania, Catania, Italy.
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132
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Pawlowski CL, Li W, Sun M, Ravichandran K, Hickman D, Kos C, Kaur G, Sen Gupta A. Platelet microparticle-inspired clot-responsive nanomedicine for targeted fibrinolysis. Biomaterials 2017; 128:94-108. [PMID: 28314136 PMCID: PMC6526940 DOI: 10.1016/j.biomaterials.2017.03.012] [Citation(s) in RCA: 105] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Revised: 03/02/2017] [Accepted: 03/10/2017] [Indexed: 12/14/2022]
Abstract
Intravascular administration of plasminogen activators is a clinically important thrombolytic strategy to treat occlusive vascular conditions. A major issue with this strategy is the systemic off-target drug action, which affects hemostatic capabilities and causes substantial hemorrhagic risks. This issue can be potentially resolved by designing technologies that allow thrombus-targeted delivery and site-specific action of thrombolytic drugs. To this end, leveraging a liposomal platform, we have developed platelet microparticle (PMP)-inspired nanovesicles (PMINs), that can protect encapsulated thrombolytic drugs in circulation to prevent off-target uptake and action, anchor actively onto thrombus via PMP-relevant molecular mechanisms and allow drug release via thrombus-relevant enzymatic trigger. Specifically, the PMINs can anchor onto thrombus via heteromultivalent ligand-mediated binding to active platelet integrin GPIIb-IIIa and P-selectin, and release the thrombolytic payload due to vesicle destabilization triggered by clot-relevant enzyme phospholipase-A2. Here we report on the evaluation of clot-targeting efficacy, lipase-triggered drug release and resultant thrombolytic capability of the PMINs in vitro, and subsequently demonstrate that intravenous delivery of thrombolytic-loaded PMINs can render targeted fibrinolysis without affecting systemic hemostasis, in vivo, in a carotid artery thrombosis model in mice. Our studies establish significant promise of the PMIN technology for safe and site-targeted nanomedicine therapies in the vascular compartment.
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Affiliation(s)
- Christa L Pawlowski
- Case Western Reserve University, Department of Biomedical Engineering, Cleveland, OH 44106, USA
| | - Wei Li
- Cleveland Clinic Foundation, Department of Cellular and Molecular Medicine, Cleveland, OH 44195, USA
| | - Michael Sun
- Case Western Reserve University, Department of Biomedical Engineering, Cleveland, OH 44106, USA
| | | | - DaShawn Hickman
- Case Western Reserve University, Department of Biomedical Engineering, Cleveland, OH 44106, USA
| | - Clarissa Kos
- Case Western Reserve University, Department of Biomedical Engineering, Cleveland, OH 44106, USA
| | - Gurbani Kaur
- Hathaway Brown School, Shaker Heights, OH 44122, USA
| | - Anirban Sen Gupta
- Case Western Reserve University, Department of Biomedical Engineering, Cleveland, OH 44106, USA.
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133
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Debono J, Dobson J, Casewell NR, Romilio A, Li B, Kurniawan N, Mardon K, Weisbecker V, Nouwens A, Kwok HF, Fry BG. Coagulating Colubrids: Evolutionary, Pathophysiological and Biodiscovery Implications of Venom Variations between Boomslang (Dispholidus typus) and Twig Snake (Thelotornis mossambicanus). Toxins (Basel) 2017; 9:E171. [PMID: 28534833 PMCID: PMC5450719 DOI: 10.3390/toxins9050171] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 05/15/2017] [Accepted: 05/15/2017] [Indexed: 12/27/2022] Open
Abstract
Venoms can deleteriously affect any physiological system reachable by the bloodstream, including directly interfering with the coagulation cascade. Such coagulopathic toxins may be anticoagulants or procoagulants. Snake venoms are unique in their use of procoagulant toxins for predatory purposes. The boomslang (Dispholidus typus) and the twig snakes (Thelotornis species) are iconic African snakes belonging to the family Colubridae. Both species produce strikingly similar lethal procoagulant pathologies. Despite these similarities, antivenom is only produced for treating bites by D. typus, and the mechanisms of action of both venoms have been understudied. In this study, we investigated the venom of D. typus and T. mossambicanus utilising a range of proteomic and bioactivity approaches, including determining the procoagulant properties of both venoms in relation to the human coagulation pathways. In doing so, we developed a novel procoagulant assay, utilising a Stago STA-R Max analyser, to accurately detect real time clotting in plasma at varying concentrations of venom. This approach was used to assess the clotting capabilities of the two venoms both with and without calcium and phospholipid co-factors. We found that T. mossambicanus produced a significantly stronger coagulation response compared to D. typus. Functional enzyme assays showed that T. mossambicanus also exhibited a higher metalloprotease and phospholipase activity but had a much lower serine protease activity relative to D. typus venom. The neutralising capability of the available boomslang antivenom was also investigated on both species, with it being 11.3 times more effective upon D. typus venom than T. mossambicanus. In addition to being a faster clotting venom, T. mossambicanus was revealed to be a much more complex venom composition than D. typus. This is consistent with patterns seen for other snakes with venom complexity linked to dietary complexity. Consistent with the external morphological differences in head shape between the two species, CT and MRI analyses revealed significant internal structural differences in skull architecture and venom gland anatomy. This study increases our understanding of not only the biodiscovery potential of these medically important species but also increases our knowledge of the pathological relationship between venom and the human coagulation cascade.
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Affiliation(s)
- Jordan Debono
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - James Dobson
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Nicholas R Casewell
- Alistair Reid Venom Research Unit, Parasitology Department, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK.
| | - Anthony Romilio
- Vertebrate Palaeontology and Biomechanics Laboratory, School of Biological Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Bin Li
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau SAR.
| | - Nyoman Kurniawan
- Centre for Advanced Imaging, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Karine Mardon
- Centre for Advanced Imaging, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Vera Weisbecker
- Vertebrate Palaeontology and Biomechanics Laboratory, School of Biological Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Amanda Nouwens
- School of Chemistry and Molecular Biosciences, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Hang Fai Kwok
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau SAR.
| | - Bryan G Fry
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, St. Lucia, QLD 4072, Australia.
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134
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Gęgotek A, Bielawska K, Biernacki M, Dobrzyńska I, Skrzydlewska E. Time-dependent effect of rutin on skin fibroblasts membrane disruption following UV radiation. Redox Biol 2017; 12:733-744. [PMID: 28412651 PMCID: PMC5393167 DOI: 10.1016/j.redox.2017.04.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 04/06/2017] [Accepted: 04/08/2017] [Indexed: 02/07/2023] Open
Abstract
Chronic exposure of the skin to solar UV radiation induces a number of biological alterations, including a redox imbalance; therefore, there is an urgent need for skin cells protective compounds. The aim of this study was to determine the effects of natural, previously extensively examined, polyphenol with antioxidant properties - rutin, on UV-induced skin fibroblasts membrane disruption. Accordingly, fibroblasts exposed to UVA and UVB irradiation were incubated with rutin (12h before and/or up to 24h after irradiation), and the structural and metabolic changes were examined. Rutin penetration through the fibroblast phospholipid bilayer was aided by UVA-induced bilitranslocase activity 2-4h after irradiation, while UVB irradiation led to enhanced phospholipid peroxidation and higher membrane permeability to facilitate the interaction of rutin with phospholipids. Lipidomic analysis revealed that 4h of rutin treatment also partially prevented UVA/B-induced increase in phosphatidylethanolamine and phosphatidylcholine level, as well as their membrane localization, which resulted in an enhanced zeta potential in the cells and liposomes. Moreover, rutin 2h following irradiation, in a various degree, prevented the increased in phospholipase A2 activity and ROS generation, and partially protected against the reduction of arachidonic and linoleic acids level and the lipid peroxidation product 4-hydroxynonenal level increase. Rutin effectively prevented against decrease in glutathione peroxidase, glutathione and vitamins E and C activities/levels, particularly 2h following UVA irradiation. In conclusion, highest skin fibroblasts membrane level of rutin occurred in 2-4h following UVA/B-radiation results in its strongest effect on biomembrane structure and functions and cellular antioxidant system irrespective of the radiation type.
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Affiliation(s)
- Agnieszka Gęgotek
- Department of Inorganic and Analytical Chemistry, Medical University of Bialystok, Bialystok, Poland
| | - Katarzyna Bielawska
- Department of Inorganic and Analytical Chemistry, Medical University of Bialystok, Bialystok, Poland
| | - Michał Biernacki
- Department of Inorganic and Analytical Chemistry, Medical University of Bialystok, Bialystok, Poland
| | - Izabela Dobrzyńska
- Department of Electrochemistry, University of Bialystok, Bialystok, Poland
| | - Elżbieta Skrzydlewska
- Department of Inorganic and Analytical Chemistry, Medical University of Bialystok, Bialystok, Poland.
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135
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Trusca VG, Fuior EV, Fenyo IM, Kardassis D, Simionescu M, Gafencu AV. Differential action of glucocorticoids on apolipoprotein E gene expression in macrophages and hepatocytes. PLoS One 2017; 12:e0174078. [PMID: 28355284 PMCID: PMC5371326 DOI: 10.1371/journal.pone.0174078] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 03/02/2017] [Indexed: 11/19/2022] Open
Abstract
Apolipoprotein E (apoE) has anti-atherosclerotic properties, being involved in the transport and clearance of cholesterol-rich lipoproteins as well as in cholesterol efflux from cells. We hypothesized that glucocorticoids may exert anti-inflammatory properties by increasing the level of macrophage-derived apoE. Our data showed that glucocorticoids increased apoE expression in macrophages in vitro as well as in vivo. Dexamethasone increased ~6 fold apoE mRNA levels in cultured peritoneal macrophages and RAW 264.7 cells. Administered to C57BL/6J mice, dexamethasone induced a two-fold increase in apoE expression in peritoneal macrophages. By contrast, glucocorticoids did not influence apoE expression in hepatocytes, in vitro and in vivo. Moreover, dexamethasone enhanced apoE promoter transcriptional activity in RAW 264.7 macrophages, but not in HepG2 cells, as tested by transient transfections. Analysis of apoE proximal promoter deletion mutants, complemented by protein-DNA interaction assays demonstrated the functionality of a putative glucocorticoid receptors (GR) binding site predicted by in silico analysis in the -111/-104 region of the human apoE promoter. In hepatocytes, GR can bind to their specific site within apoE promoter but are not able to modulate the gene expression. The modulatory blockade in hepatocytes is a consequence of partial involvement of transcription factors and other signaling molecules activated through MEK1/2 and PLA2/PLC pathways. In conclusion, our study indicates that glucocorticoids (1) differentially target apoE gene expression; (2) induce a significant increase in apoE level specifically in macrophages. The local increase of apoE gene expression in macrophages at the level of the atheromatous plaque may have therapeutic implications in atherosclerosis.
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Affiliation(s)
- Violeta Georgeta Trusca
- Department of Genomics, Transcriptomics and Molecular Therapies, Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, Bucharest, Romania
| | - Elena Valeria Fuior
- Department of Genomics, Transcriptomics and Molecular Therapies, Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, Bucharest, Romania
| | - Ioana Madalina Fenyo
- Department of Genomics, Transcriptomics and Molecular Therapies, Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, Bucharest, Romania
| | - Dimitris Kardassis
- Department of Basic Sciences, University of Crete Medical School, Heraklion, Crete, Greece
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology of Hellas, Heraklion, Crete, Greece
| | - Maya Simionescu
- Department of Genomics, Transcriptomics and Molecular Therapies, Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, Bucharest, Romania
| | - Anca Violeta Gafencu
- Department of Genomics, Transcriptomics and Molecular Therapies, Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, Bucharest, Romania
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136
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Smichi N, Othman H, Achouri N, Noiriel A, Arondel V, Srairi-Abid N, Abousalham A, Gargouri Y, Miled N, Fendri A. Functional and Structural Characterization of a Thermostable Phospholipase A 2 from a Sparidae Fish (Diplodus annularis). J Agric Food Chem 2017; 65:2468-2480. [PMID: 28287729 DOI: 10.1021/acs.jafc.6b05810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Novel phospholipase (PLA2) genes from the Sparidae family were cloned. The sequenced PLA2 revealed an identity with pancreatic PLA2 group IB. To better understand the structure/function relationships of these enzymes and their evolution, the Diplodus annularis PLA2 (DaPLA2) was overexpressed in E. coli. The refolded enzyme was purified by Ni-affinity chromatography and has a molecular mass of 15 kDa as determined by MALDI-TOF spectrometry. Interestingly, unlike the pancreatic type, the DaPLA2 was active and stable at higher temperatures, which suggests its great potential in biotechnological applications. The 3D structure of DaPLA2 was constructed to gain insights into the functional properties of sparidae PLA2. Molecular docking and dynamic simulations were performed to explain the higher thermal stability and the substrate specificity of DaPLA2. Using the monolayer technique, the purified DaPLA2 was found to be active on various phospholipids ranging from 10 to 20 mN·m-1, which explained the absence of the hemolytic activity for DaPLA2.
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Affiliation(s)
- Nabil Smichi
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS , 3038 Sfax, Tunisia
- Enzymologie Interfaciale et Physiologie de la Lipolyse, UMR7282, CNRS, Aix-Marseille Université , 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Houcemeddine Othman
- Laboratoire des Venins et Biomolécules Thérapeutiques LR11IPT08, Université Tunis-El Manar, Institut Pasteur de Tunis , Tunis 1002, Tunisia
| | - Neila Achouri
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS , 3038 Sfax, Tunisia
| | - Alexandre Noiriel
- Univ Lyon, Université Lyon 1, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires (ICBMS), UMR 5246 CNRS, Métabolisme, Enzymes et Mécanismes Moléculaires (MEM2 , F-69622 Villeurbanne cedex, France
| | - Vincent Arondel
- Univ Bordeaux, UMR 5200, Laboratoire de Biogenèse Membranaire , Bat. A3 Campus INRA de Bordeaux 71 avenue E., Bourlaux CS 2003233140 Villenave d'Ornon, France
| | - Najet Srairi-Abid
- Laboratoire des Venins et Biomolécules Thérapeutiques LR11IPT08, Université Tunis-El Manar, Institut Pasteur de Tunis , Tunis 1002, Tunisia
| | - Abdelkarim Abousalham
- Univ Lyon, Université Lyon 1, Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires (ICBMS), UMR 5246 CNRS, Métabolisme, Enzymes et Mécanismes Moléculaires (MEM2 , F-69622 Villeurbanne cedex, France
| | - Youssef Gargouri
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS , 3038 Sfax, Tunisia
| | - Nabil Miled
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS , 3038 Sfax, Tunisia
| | - Ahmed Fendri
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, ENIS , 3038 Sfax, Tunisia
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Fisher AB. Peroxiredoxin 6 in the repair of peroxidized cell membranes and cell signaling. Arch Biochem Biophys 2017; 617:68-83. [PMID: 27932289 PMCID: PMC5810417 DOI: 10.1016/j.abb.2016.12.003] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 12/02/2016] [Accepted: 12/03/2016] [Indexed: 12/12/2022]
Abstract
Peroxiredoxin 6 represents a widely distributed group of peroxiredoxins that contain a single conserved cysteine in the protein monomer (1-cys Prdx). The cys when oxidized to the sulfenic form is reduced with glutathione (GSH) catalyzed by the π isoform of GSH-S-transferase. Three enzymatic activities of the protein have been described:1) peroxidase with H2O2, short chain hydroperoxides, and phospholipid hydroperoxides as substrates; 2) phospholipase A2 (PLA2); and 3) lysophosphatidylcholine acyl transferase (LPCAT). These activities have important physiological roles in antioxidant defense, turnover of cellular phospholipids, and the generation of superoxide anion via initiation of the signaling cascade for activation of NADPH oxidase (type 2). The ability of Prdx6 to reduce peroxidized cell membrane phospholipids (peroxidase activity) and also to replace the oxidized sn-2 fatty acyl group through hydrolysis/reacylation (PLA2 and LPCAT activities) provides a complete system for the repair of peroxidized cell membranes.
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Affiliation(s)
- Aron B Fisher
- Institute for Environmental Medicine of the Department of Physiology, University of Pennsylvania, 3620 Hamilton Walk, 1 John Morgan Building, Philadelphia, PA, United States.
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Paillamanque J, Sanchez-Tusie A, Carmona EM, Treviño CL, Sandoval C, Nualart F, Osses N, Reyes JG. Arachidonic acid triggers [Ca2+]i increases in rat round spermatids by a likely GPR activation, ERK signalling and ER/acidic compartments Ca2+ release. PLoS One 2017; 12:e0172128. [PMID: 28192519 PMCID: PMC5305069 DOI: 10.1371/journal.pone.0172128] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 01/31/2017] [Indexed: 12/27/2022] Open
Abstract
Arachidonic acid (AA), a compound secreted by Sertoli cells (SC) in a FSH-dependent manner, is able to induce the release of Ca2+ from internal stores in round spermatids and pachytene spermatocytes. In this study, the possible site(s) of action of AA in round spermatids, the signalling pathways associated and the intracellular Ca2+ stores targeted by AA-induced signalling were pharmacologically characterized by measuring intracellular Ca2+ using fluorescent Ca2+ probes. Our results suggest that AA acts by interacting with a fatty acid G protein coupled receptor, initiating a G protein signalling cascade that may involve PLA2 and ERK activation, which in turn opens intracellular ryanodine-sensitive channels as well as NAADP-sensitive channels in acidic intracellular Ca2+ stores. The results presented here also suggest that AMPK and PKA modulate this AA-induced Ca2+ release from intracellular Ca2+ stores in round spermatids. We propose that unsaturated free fatty acid lipid signalling in the seminiferous tubule is a novel regulatory component of rat spermatogenesis.
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Affiliation(s)
- Joaquin Paillamanque
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Ana Sanchez-Tusie
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Autónoma de México, Cuernavaca, México
| | - Emerson M. Carmona
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Claudia L. Treviño
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Autónoma de México, Cuernavaca, México
| | - Carolina Sandoval
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Francisco Nualart
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Nelson Osses
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Juan G. Reyes
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
- * E-mail:
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Li Q, Dong X, Zheng W, Zhang H. The PLA2 gene mediates the humoral immune responses in Bactrocera dorsalis (Hendel). Dev Comp Immunol 2017; 67:293-299. [PMID: 27646139 DOI: 10.1016/j.dci.2016.09.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 09/13/2016] [Accepted: 09/14/2016] [Indexed: 06/06/2023]
Abstract
The phospholipase A2 (PLA2) gene encodes the enzyme that catalyzes the hydrolysis of phospholipids (PLs) from the sn-2 position. However, little is known about its role in humoral immune responses. In this study, we investigated the expression profile of PLA2 in different tissues and developmental stages in Bactrocera dorsalis (Hendel), and the results showed that the transcriptional level of PLA2 was high in the egg and mature stage and in the testis tissue. Bacterial infection increased the expression of PLA2, and the highest degree of up-regulation appeared in the fat body. Silencing PLA2 influenced the expression of immune-related genes, including MyD88 and defensin in the Toll pathway and relish and diptericin in the Imd pathway. Moreover, the expression of MyD88 and defensin was down-regulated significantly in the ds-PLA2 group compared with those in the ds-egfp group when B. dorsalis was infected with L. monocytogenes and S. aureus, indicating that PLA2 was involved in the activation of the Toll pathway. Meanwhile, infection with L. monocytogenes and E. coli, which activate the Imd pathway, does not increase the mRNA levels of relish and diptericin in the ds-PLA2 group as severely as it increases those in the ds-egfp group, indicating that the Imd pathway was also repressed after silencing PLA2. Notably, the development of lipid droplets in fat body cells was influenced by silencing PLA2, implying that PLA2 affects the function of fat body tissue. These results suggest that the PLA2 gene may mediate humoral immune responses by reducing lipid storage in fat body cells in B. dorsalis.
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Affiliation(s)
- Qiujia Li
- Key Laboratory of Horticultural Plant Biology (MOE), State Key Laboratory of Agricultural Microbiology, Institute of Urban and Horticultural Entomology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Xiaolong Dong
- Key Laboratory of Horticultural Plant Biology (MOE), State Key Laboratory of Agricultural Microbiology, Institute of Urban and Horticultural Entomology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Weiwei Zheng
- Key Laboratory of Horticultural Plant Biology (MOE), State Key Laboratory of Agricultural Microbiology, Institute of Urban and Horticultural Entomology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hongyu Zhang
- Key Laboratory of Horticultural Plant Biology (MOE), State Key Laboratory of Agricultural Microbiology, Institute of Urban and Horticultural Entomology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
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de Moura VM, de Souza LYA, da Costa Guimarães N, Dos Santos IGC, de Almeida PDO, de Oliveira RB, Mourão RHV, Dos-Santos MC. The potential of aqueous extracts of Bellucia dichotoma Cogn. (Melastomataceae) to inhibit the biological activities of Bothrops atrox venom: A comparison of specimens collected in the states of Pará and Amazonas, Brazil. J Ethnopharmacol 2017; 196:168-177. [PMID: 27993635 DOI: 10.1016/j.jep.2016.12.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 12/05/2016] [Accepted: 12/16/2016] [Indexed: 06/06/2023]
Abstract
ETHNOPHARMACOLOGICAL IMPORTANCE The effectiveness of aqueous extract of Bellucia dichotoma Cogn. (Melastomataceae) specimems collected in Santarém, PA, against some biological activities of Bothrops atrox venom (BaV) has been scientifically proven. Here, we analyzed the components and assessed the anti-snakebite potential of aqueous extracts of bark of B. dichotoma collected in Manaus, AM, (AEBd-MAO) and Santarém, PA, (AEBd-STM), both in Brazil. MATERIALS AND METHODS The phytochemical profiles of the aqueous extracts were identified using thin layer chromatography (TLC), and the concentrations of phenolics were determined by colorimetric assay. The inhibitory potential of the extracts was tested against the phospholipase A2, coagulant and gelatinolytic activities of BaV in vitro and its defibrinating and edema-inducing activities in vivo. Interaction between BaV and the extracts was investigated using SDS-Page electrophoresis and Western blotting. Extract cytotoxicity and antioxidant potential were assessed using the human fibroblast cell line MRC-5 and the DPPH assay in cell culture, respectively. RESULTS While there was no difference between the phytochemical profiles of the extracts, AEBd-MAO had higher concentrations of total phenolics, total tannins and hydrolysable tannins. The extracts inhibited 100% of the phospholipase and coagulant activity of BaV when pre-incubated. Without pre-incubation, however, there was no reduction in phospholipase activity, although significant inhibition of coagulant activity was observed. In the doses used in folk medicine, without pre-incubation, both extracts inhibited 100% of the coagulant activity of BaV. In vivo, the extracts were unable to inhibit the defibrinating activity of the venom but were effective in inhibiting its edema-inducing activity. In the profiles of the extracts pre-incubated with BaV, not all the protein bands revealed by SDS-PAGE and Western blot were observed. Both extracts had a high antioxidant potential and neither had a cytotoxic effect. CONCLUSION Although the concentrations of phenolics in each extract were different, the anti-snakebite potential was similar for the concentrations of extract tested. Our findings are of importance for the quality control of this raw material, which, once tested in accordance with Brazilian National Health Surveillance Agency recommendations, may be suitable for use as a phytomedicine to complement treatment of the local effects induced by Bothrops venoms.
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Affiliation(s)
- Valéria Mourão de Moura
- Programa Multi-institucional de Pós-graduação em Biotecnologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, AM, Brazil; Laboratório de Imunoquímica, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, AM, Brazil.
| | - Luana Yamille Andrade de Souza
- Laboratório de Imunoquímica, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, AM, Brazil
| | - Noranathan da Costa Guimarães
- Programa de Pós-graduação em Recursos Naturais da Amazônia, Laboratório de Bioprospecção e Biologia Experimental, Universidade Federal do Oeste do Pará, Santarém, PA, Brazil
| | - Ilia Gilmara Carvalho Dos Santos
- Programa Multi-institucional de Pós-graduação em Biotecnologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, AM, Brazil; Laboratório de Imunoquímica, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, AM, Brazil
| | | | - Ricardo Bezerra de Oliveira
- Programa de Pós-graduação em Recursos Naturais da Amazônia, Laboratório de Bioprospecção e Biologia Experimental, Universidade Federal do Oeste do Pará, Santarém, PA, Brazil
| | - Rosa Helena Veras Mourão
- Programa de Pós-graduação em Recursos Naturais da Amazônia, Laboratório de Bioprospecção e Biologia Experimental, Universidade Federal do Oeste do Pará, Santarém, PA, Brazil
| | - Maria Cristina Dos-Santos
- Programa Multi-institucional de Pós-graduação em Biotecnologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, AM, Brazil; Laboratório de Imunoquímica, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, AM, Brazil
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Abstract
The phospholipase A2 (PLA2) family comprises a group of lipolytic enzymes that typically hydrolyze the sn-2 position of glycerophospholipids to give rise to fatty acids and lysophospholipids. The mammalian genome encodes more than 50 PLA2s or related enzymes, which are classified into several subfamilies on the basis of their structures and functions. From a general viewpoint, the PLA2 family has mainly been implicated in signal transduction, producing bioactive lipid mediators derived from fatty acids and lysophospholipids. Recent evidence indicates that PLA2s also contribute to phospholipid remodeling for membrane homeostasis or energy production for fatty acid β-oxidation. Accordingly, PLA2 enzymes can be regarded as one of the key regulators of the quality of lipids, which I herein refer to as lipoquality. Disturbance of PLA2-regulated lipoquality hampers tissue and cellular homeostasis and can be linked to various diseases. Here I overview the current state of understanding of the classification, enzymatic properties, and physiological functions of the PLA2 family.
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Affiliation(s)
- Makoto MURAKAMI
- Laboratory of Environmental and Metabolic Health Sciences, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo, Japan
- Lipid Metabolism Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
- AMED-CREST, Japan Agency for Medical Research and Development, Tokyo, Japan
- Correspondence should be addressed: M. Murakami, Laboratory of Environmental and Metabolic Health Sciences, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan (e-mail: )
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Hossen MS, Shapla UM, Gan SH, Khalil MI. Impact of Bee Venom Enzymes on Diseases and Immune Responses. Molecules 2016; 22:molecules22010025. [PMID: 28035985 PMCID: PMC6155781 DOI: 10.3390/molecules22010025] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Revised: 12/20/2016] [Accepted: 12/22/2016] [Indexed: 01/14/2023] Open
Abstract
Bee venom (BV) is used to treat many diseases and exhibits anti-inflammatory, anti-bacterial, antimutagenic, radioprotective, anti-nociceptive immunity promoting, hepatocyte protective and anti-cancer activity. According to the literature, BV contains several enzymes, including phospholipase A2 (PLA2), phospholipase B, hyaluronidase, acid phosphatase and α-glucosidase. Recent studies have also reported the detection of different classes of enzymes in BV, including esterases, proteases and peptidases, protease inhibitors and other important enzymes involved in carbohydrate metabolism. Nevertheless, the physiochemical properties and functions of each enzyme class and their mechanisms remain unclear. Various pharmacotherapeutic effects of some of the BV enzymes have been reported in several studies. At present, ongoing research aims to characterize each enzyme and elucidate their specific biological roles. This review gathers all the current knowledge on BV enzymes and their specific mechanisms in regulating various immune responses and physiological changes to provide a basis for future therapies for various diseases.
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Affiliation(s)
- Md Sakib Hossen
- Laboratory of Preventive and Integrative Biomedicine, Department of Biochemistry and Molecular Biology, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh.
| | - Ummay Mahfuza Shapla
- Laboratory of Preventive and Integrative Biomedicine, Department of Biochemistry and Molecular Biology, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh.
| | - Siew Hua Gan
- Human Genome Centre, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan 16150, Malaysia.
| | - Md Ibrahim Khalil
- Laboratory of Preventive and Integrative Biomedicine, Department of Biochemistry and Molecular Biology, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh.
- Human Genome Centre, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan 16150, Malaysia.
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143
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Yamamoto K. [The new lipid mediators that modulate skin homeostasis and diseases]. Seikagaku 2016; 88:786-790. [PMID: 29624356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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El-Ansary A, Hassan WM, Qasem H, Das UN. Identification of Biomarkers of Impaired Sensory Profiles among Autistic Patients. PLoS One 2016; 11:e0164153. [PMID: 27824861 PMCID: PMC5100977 DOI: 10.1371/journal.pone.0164153] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 09/20/2016] [Indexed: 01/19/2023] Open
Abstract
Background Autism is a neurodevelopmental disorder that displays significant heterogeneity. Comparison of subgroups within autism, and analyses of selected biomarkers as measure of the variation of the severity of autistic features such as cognitive dysfunction, social interaction impairment, and sensory abnormalities might help in understanding the pathophysiology of autism. Methods and Participants In this study, two sets of biomarkers were selected. The first included 7, while the second included 6 biomarkers. For set 1, data were collected from 35 autistic and 38 healthy control participants, while for set 2, data were collected from 29 out of the same 35 autistic and 16 additional healthy subjects. These markers were subjected to a principal components analysis using either covariance or correlation matrices. Moreover, libraries composed of participants categorized into units were constructed. The biomarkers used include, PE (phosphatidyl ethanolamine), PS (phosphatidyl serine), PC (phosphatidyl choline), MAP2K1 (Dual specificity mitogen-activated protein kinase kinase 1), IL-10 (interleukin-10), IL-12, NFκB (nuclear factor-κappa B); PGE2 (prostaglandin E2), PGE2-EP2, mPGES-1 (microsomal prostaglandin synthase E-1), cPLA2 (cytosolic phospholipase A2), 8-isoprostane, and COX-2 (cyclo-oxygenase-2). Results While none of the studied markers correlated with CARS and SRS as measure of cognitive and social impairments, six markers significantly correlated with sensory profiles of autistic patients. Multiple regression analysis identifies a combination of PGES, mPGES-1, and PE as best predictors of the degree of sensory profile impairment. Library identification resulted in 100% correct assignments of both autistic and control participants based on either set 1 or 2 biomarkers together with a satisfactory rate of assignments in case of sensory profile impairment using different sets of biomarkers. Conclusion The two selected sets of biomarkers were effective to separate autistic from healthy control subjects, demonstarting the possibility to accurately predict the severity of autism using the selected biomarkers. The effectiveness of the identified libraries lied in the fact that they were helpful in correctly assigning the study population as control or autistic patients and in classifying autistic patients with different degree of sensory profile impairment.
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Affiliation(s)
- Afaf El-Ansary
- Central Laboratory, Center for Female Scientific and Medical Colleges, King Saud University, Riyadh, Saudi Arabia
- Therapuetic Chemistry Department, National Research Centre, Dokki, Cairo, Egypt
| | - Wail M. Hassan
- Department of Biomedical Sciences, College of Health Sciences, University of Wisconsin – Milwaukee, Milwaukee, Wisconsin, United States of America
| | - Hanan Qasem
- Biochemistry Department, Science College, King Saud University, Riyadh, Saudi Arabia
| | - Undurti N. Das
- UND Life Sciences, 2020 S 360 St, # K-202, Federal Way, Washington, 98003, United States of America
- BioScience Research Centre, GVP College of Engineering Campus, Visakhapatnam-530048, India
- * E-mail:
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Picanço LCDS, Bittencourt JAHM, Henriques SVC, da Silva JS, Oliveira JMDS, Ribeiro JR, Sanjay AB, Carvalho JCT, Stien D, Silva JOD. Pharmacological activity of Costus spicatus in experimental Bothrops atrox envenomation. Pharm Biol 2016; 54:2103-2110. [PMID: 27306958 DOI: 10.3109/13880209.2016.1145703] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
CONTEXT Medicinal plants encompass a rich source of active compounds that can neutralize snake venoms or toxins. Costus spicatus (Jacq.) Sw. (Costaceae) is used by the Amazonian population to treat inflammation, pain and other pathological manifestations. OBJECTIVE To evaluate the influence of C. spicatus aqueous extract on edema, peritonitis, nociception, coagulation, haemorrhage and indirect haemolytic activity induced by Bothrops atrox venom (BAV). MATERIALS AND METHODS Dried and pulverized leaves were extracted with distilled water. Envenoming was induced by administration of B. atrox snake venom in Swiss Webster mice. The experimental groups consisted of BAV (at the minimum dose to induce measurable biological responses) and C. spicatus extract (CSE, 1.25, 2.5, 5.0, 7.5 and 10 mg/kg/25 μl phosphate-buffered saline) administered individually and in combination (BAVCSE). PBS was used as a control. In vitro assays were also conducted in order to evaluate phospholipase A2 coagulant activities (indirect haemolytic method). RESULTS CSE significantly reduced the venom-induced edema and nociception at all concentrations tested and inhibited migration of inflammatory cells at the three least concentrations (5.0, 7.5 and 10 mg/kg/25 μl PBS). CSE was not effective in inhibiting coagulant, haemorrhagic and indirect haemolytic activities of the venom. DISCUSSION AND CONCLUSION The data suggest that CSE could exhibit a central mechanism for pain inhibition, and may also inhibit prostaglandin synthesis. These findings corroborate the traditional administration of C. spicatus decoction to treat inflammatory disorders, including those caused by B. atrox envenomation.
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Affiliation(s)
| | | | | | - Juliane Silva da Silva
- a Toxicology Laboratory, Pharmaceutical Science Course , Federal University of Amapá , Macapa , Brazil
| | | | | | - Antony-Babu Sanjay
- c Department of Food Science and Technology , University of Nebraska-Lincoln , Lincoln , NE , USA
| | | | - Didier Stien
- e Laboratoire De Biodiversité Et Biotechnologies Microbiennes, Observatoire Océanologique , Sorbonne Universités, UPMC Univ Paris 06, CNRS , Banyuls-sur-Mer , France
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Sivaprakasam C, Nachiappan V. Modulatory effect of cadmium on the expression of phospholipase A2 and proinflammatory genes in rat testis. Environ Toxicol 2016; 31:1176-1184. [PMID: 25808797 DOI: 10.1002/tox.22124] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 01/21/2015] [Accepted: 01/25/2015] [Indexed: 06/04/2023]
Abstract
Cadmium (Cd) is a toxic metal that is hazardous to health, and its exposure showed a significant reduction in mitochondrial phospholipid function in the rat testes. Cd induction enhanced phospholipases (PLA2 s) activities, specifically the secretory PLA2 and cytosolic PLA2 . There was a reduction in mitochondrial membrane potential and significant decline in the respiratory complexes, which was confirmed by 2D blue native gel. The mRNA expression of cyclooxygenase and proinflammatory cytokine genes interleukin (IL)-1, IL-6, tumor necrosis factor-α, inducible nitric oxide synthase, and interferon-γ increased and that of anti-inflammatory cytokine IL-10 reduced with Cd exposure in a time-dependent manner. The gene expression of the proapoptotic factor Bax was elevated, and in parallel, the antiapoptotic factor Bcl2 was down-regulated. Hence, this study explored the testes under Cd toxicity and observed alterations in PLA2 s and mitochondrial membrane composition/function and further explored the impact of these alterations on proinflammation and apoptosis. © 2015 Wiley Periodicals, Inc. Environ Toxicol 31: 1176-1184, 2016.
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Affiliation(s)
- Chinnarasu Sivaprakasam
- Biomembrane Laboratory, Department of Biochemistry, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamilnadu, 620024, India
| | - Vasanthi Nachiappan
- Biomembrane Laboratory, Department of Biochemistry, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamilnadu, 620024, India
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Jdir H, Khemakham B, Najjaa H, Chakroun M, Jridi M, Ben Arfa A, Ben Ali Y, Zouari N. Anti-inflammatory and anti-proliferative activities of the wild edible cruciferous: Diplotaxis simplex. Pharm Biol 2016; 54:2111-8. [PMID: 26916801 DOI: 10.3109/13880209.2016.1145704] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Context The present study deals with new biological properties of the wild edible Diplotaxis simplex (Viv.) Spreng (Brassicaceae). Objectives The current study evaluates the antioxidant, the anti-inflammatory and the anti-cancer properties of ethyl acetate and ethanol extracts from D. simplex flowers. Materials and methods The anti-proliferative activity of the extracts (10-70 μg/mL) was assessed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) against human colon cancer cell line Caco-2. The anti-inflammatory potential was evaluated by the inhibitory effect of the extracts (1.5-7.5 mg/mL) on phospholipase A2 activity as well as on carrageenan-induced paw oedema in mice. Extracts (200 mg/kg) or indomethacin (50 mg/kg) as positive control were injected intraperitoneally for albino mice prior to the induction of the oedema by carrageenan. Antioxidant activities were investigated using various complementary methods. Results Flower extracts contained a high level of polyphenolics (17.10-52.70 mg GAE/g) and flavonoids (74.20-100.60 mg QE/g), which correlate with its appreciable antioxidant potential in β-carotene peroxidation (IC50 value: 12.50-27.10 μg/mL), DPPH(•) radical-scavenging (IC50 value: 0.20-0.40 mg/mL), Fe(3+ )reducing (EC50 value: 0.10-0.14 mg/mL) and Fe(2+ )chelating (IC50 value: 0.20-0.60 mg/mL) assays. These extracts were effective in inhibiting cancer cell growth (IC50 value: 62.0-63.25 μg/mL). Besides, the ethyl acetate extract inhibited phospholipase A2 activity (IC50 value: 2.97 mg/mL) and reduced the paw oedema in mice (from 0.38 ± 0.01 to 0.24 ± 0.01 cm), 4 h post-carrageenan challenge. Conclusion These data suggest that D. simplex may be useful as a candidate in the treatment of inflammation and the colon cancer.
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Affiliation(s)
- Hamida Jdir
- a Laboratory of Enzyme Engineering of Lipases and Biochemistry, Engineering National School of Sfax (ENIS) , University of Sfax , Sfax , Tunisia
| | - Bassem Khemakham
- b Laboratory of Plant Biotechnology, Faculty of Sciences of Sfax , University of Sfax , Sfax , Tunisia
| | - Hanen Najjaa
- c Laboratory of Pastoral Ecology , Arid Lands Institute , Medenine , Tunisia
| | - Mouna Chakroun
- b Laboratory of Plant Biotechnology, Faculty of Sciences of Sfax , University of Sfax , Sfax , Tunisia
| | - Mourad Jridi
- d Laboratory of Enzyme Engineering and Microbiology , ENIS, University of Sfax , Sfax , Tunisia
| | - Abdelkarim Ben Arfa
- c Laboratory of Pastoral Ecology , Arid Lands Institute , Medenine , Tunisia
| | - Yassine Ben Ali
- a Laboratory of Enzyme Engineering of Lipases and Biochemistry, Engineering National School of Sfax (ENIS) , University of Sfax , Sfax , Tunisia
| | - Nacim Zouari
- e High Institute of Applied Biology of Medenine, University of Gabes , Medenine , Tunisia
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Caporarello N, Salmeri M, Scalia M, Motta C, Parrino C, Frittitta L, Olivieri M, Cristaldi M, Avola R, Bramanti V, Toscano MA, Anfuso CD, Lupo G. Cytosolic and Calcium-Independent Phospholipases A2 Activation and Prostaglandins E2 Are Associated with Escherichia coli-Induced Reduction of Insulin Secretion in INS-1E Cells. PLoS One 2016; 11:e0159874. [PMID: 27631977 PMCID: PMC5024995 DOI: 10.1371/journal.pone.0159874] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 09/02/2016] [Indexed: 01/01/2023] Open
Abstract
It is suspected that microbial infections take part in the pathogenesis of diabetes mellitus type 1 (T1DM). Glucose-induced insulin secretion is accompanied by the release of free arachidonic acid (AA) mainly by cytosolic- and calcium independent phospholipases A2 (cPLA2 and iPLA2). Insulinoma cell line (INS-1E) was infected with E. coli isolated from the blood culture of a patient with sepsis. Invasion assay, Scanning Electron Microscopy and Transmission Electron Microscopy demonstrated the capacity of E. coli to enter cells, which was reduced by PLA2 inhibitors. Glucose-induced insulin secretion was significantly increased after acute infection (8h) but significantly decreased after chronic infection (72h). PLA2 activities, cPLA2, iPLA2, phospho-cPLA2, and COX-2 expressions were increased after acute and, even more, after chronic E. coli infection. The silencing of the two isoforms of PLA2s, with specific cPLA2- or iPLA2-siRNAs, reduced insulin secretion after acute infection and determined a rise in insulin release after chronic infection. Prostaglandins E2 (PGE2) production was significantly elevated in INS-1E after long-term E. coli infection and the restored insulin secretion in presence of L798106, a specific EP3 antagonist, and NS-398, a COX-2 inhibitor, and the reduction of insulin secretion in presence of sulprostone, a specific EP3 agonist, revealed their involvement in the effects triggered by bacterial infection. The results obtained demonstrated that cPLA2 and iPLA2 play a key role in insulin secretion process after E. coli infection. The high concentration of AA released is transformed into PGE2, which could be responsible for the reduced insulin secretion.
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Affiliation(s)
- Nunzia Caporarello
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Mario Salmeri
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Marina Scalia
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Carla Motta
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Cristina Parrino
- Dept. of Clinical and Experimental Medicine, School of Medicine, University of Catania, Catania, Italy
| | - Lucia Frittitta
- Dept. of Clinical and Experimental Medicine, School of Medicine, University of Catania, Catania, Italy
| | - Melania Olivieri
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Martina Cristaldi
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Roberto Avola
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Vincenzo Bramanti
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Maria Antonietta Toscano
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Carmelina Daniela Anfuso
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
| | - Gabriella Lupo
- Dept. of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania, Italy
- * E-mail:
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Lewin M, Samuel S, Merkel J, Bickler P. Varespladib (LY315920) Appears to Be a Potent, Broad-Spectrum, Inhibitor of Snake Venom Phospholipase A2 and a Possible Pre-Referral Treatment for Envenomation. Toxins (Basel) 2016; 8:toxins8090248. [PMID: 27571102 PMCID: PMC5037474 DOI: 10.3390/toxins8090248] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 08/11/2016] [Accepted: 08/15/2016] [Indexed: 01/07/2023] Open
Abstract
Snakebite remains a neglected medical problem of the developing world with up to 125,000 deaths each year despite more than a century of calls to improve snakebite prevention and care. An estimated 75% of fatalities from snakebite occur outside the hospital setting. Because phospholipase A2 (PLA2) activity is an important component of venom toxicity, we sought candidate PLA2 inhibitors by directly testing drugs. Surprisingly, varespladib and its orally bioavailable prodrug, methyl-varespladib showed high-level secretory PLA2 (sPLA2) inhibition at nanomolar and picomolar concentrations against 28 medically important snake venoms from six continents. In vivo proof-of-concept studies with varespladib had striking survival benefit against lethal doses of Micrurus fulvius and Vipera berus venom, and suppressed venom-induced sPLA2 activity in rats challenged with 100% lethal doses of M. fulvius venom. Rapid development and deployment of a broad-spectrum PLA2 inhibitor alone or in combination with other small molecule inhibitors of snake toxins (e.g., metalloproteases) could fill the critical therapeutic gap spanning pre-referral and hospital setting. Lower barriers for clinical testing of safety tested, repurposed small molecule therapeutics are a potentially economical and effective path forward to fill the pre-referral gap in the setting of snakebite.
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Affiliation(s)
- Matthew Lewin
- Research and Development, Ophirex, Inc., Corte Madera, CA 94925, USA.
- Center for Exploration and Travel Health, California Academy of Sciences, San Francisco, CA 94118, USA.
| | - Stephen Samuel
- General Medicine, Queen Elizabeth Hospital, King's Lynn, Norfolk PE30 4ET, UK.
| | - Janie Merkel
- Yale Center for Molecular Discovery, Yale University, West Haven, CT 06516, USA.
| | - Philip Bickler
- Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA.
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150
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Kwon J, Wang A, Burke DJ, Boudreau HE, Lekstrom KJ, Korzeniowska A, Sugamata R, Kim YS, Yi L, Ersoy I, Jaeger S, Palaniappan K, Ambruso DR, Jackson SH, Leto TL. Peroxiredoxin 6 (Prdx6) supports NADPH oxidase1 (Nox1)-based superoxide generation and cell migration. Free Radic Biol Med 2016; 96:99-115. [PMID: 27094494 PMCID: PMC4929831 DOI: 10.1016/j.freeradbiomed.2016.04.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 04/11/2016] [Accepted: 04/12/2016] [Indexed: 02/05/2023]
Abstract
Nox1 is an abundant source of reactive oxygen species (ROS) in colon epithelium recently shown to function in wound healing and epithelial homeostasis. We identified Peroxiredoxin 6 (Prdx6) as a novel binding partner of Nox activator 1 (Noxa1) in yeast two-hybrid screening experiments using the Noxa1 SH3 domain as bait. Prdx6 is a unique member of the Prdx antioxidant enzyme family exhibiting both glutathione peroxidase and phospholipase A2 activities. We confirmed this interaction in cells overexpressing both proteins, showing Prdx6 binds to and stabilizes wild type Noxa1, but not the SH3 domain mutant form, Noxa1 W436R. We demonstrated in several cell models that Prdx6 knockdown suppresses Nox1 activity, whereas enhanced Prdx6 expression supports higher Nox1-derived superoxide production. Both peroxidase- and lipase-deficient mutant forms of Prdx6 (Prdx6 C47S and S32A, respectively) failed to bind to or stabilize Nox1 components or support Nox1-mediated superoxide generation. Furthermore, the transition-state substrate analogue inhibitor of Prdx6 phospholipase A2 activity (MJ-33) was shown to suppress Nox1 activity, suggesting Nox1 activity is regulated by the phospholipase activity of Prdx6. Finally, wild type Prdx6, but not lipase or peroxidase mutant forms, supports Nox1-mediated cell migration in the HCT-116 colon epithelial cell model of wound closure. These findings highlight a novel pathway in which this antioxidant enzyme positively regulates an oxidant-generating system to support cell migration and wound healing.
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Affiliation(s)
- Jaeyul Kwon
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
- Department of Medical Education, School of Medicine, Chungnam National University, Daejeon, 301-747, Korea
| | - Aibing Wang
- Diabetes Cluster, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, USA
| | - Devin J. Burke
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Howard E. Boudreau
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Kristen J. Lekstrom
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Agnieszka Korzeniowska
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Ryuichi Sugamata
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Yong-Soo Kim
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Liang Yi
- Diabetes Cluster, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, USA
| | - Ilker Ersoy
- Department of Pathology and Anatomical Sciences, University of Missouri, Sch. of Medicine, Columbia, MO, USA
| | - Stefan Jaeger
- Lister Hill National Center for Biomedical Communications, National Library of Medicine, National Institutes of Health, Bethesda, MD, USA
| | | | - Daniel R. Ambruso
- Department of Pediatrics, University of Colorado Sch. of Medicine, Denver, CO, USA
| | - Sharon H. Jackson
- Diabetes Cluster, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, USA
| | - Thomas L. Leto
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
- Corresponding author: Laboratory of Host Defenses, NIAID, NIH, 12441 Parklawn Drive, Rockville, MD, 20852, USA. Fax: 301 480-1731.
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