1
|
Shabbir S, Hu Y, He X, Huang K, Xu W. Toxicity and Impact of Silica Nanoparticles on the Configuration of Gut Microbiota in Immunodeficient Mice. Microorganisms 2023; 11:1183. [PMID: 37317157 DOI: 10.3390/microorganisms11051183] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 04/25/2023] [Accepted: 04/26/2023] [Indexed: 06/16/2023] Open
Abstract
Nanoparticles (NPs), having exceptional physicochemical and electrical characteristics with lower toxicity, have evolved as dynamic drug delivery carriers in living organisms. Potentially, the intragastric gavage of silica nanoparticles (SiNPs) affects gut microbiota profiles in immunodeficient mice. In this study, the impact of SiNPs of variable size and dosage was investigated in cyclophosphamide (Cy)-induced immunodeficient mice, specifically on their immune functions and gut microbiota, through physicochemical and metagenomic analysis. SiNPs of different sizes and doses were gavaged to Cy-induced immunodeficient mice for 12 days at an interval of 24 h to investigate their effects on immunological functions and the gut microbiome of mice. Our results showed that SiNPs had no significant toxicological effects on the cellular and hematological activities of immunodeficient mice. Furthermore, after the administration of different levels of SiNPs, no immune dysfunction was found in the immunosuppressed mice groups. However, gut-microbial studies and comparisons of characteristic bacterial diversity and compositions demonstrated that SiNPs significantly affect the abundance of different bacterial communities. LEfSe analysis revealed that SiNPs significantly increased the abundance of Lactobacillus, Sphingomonas, Sutterella, Akkermansia, and Prevotella, and potentially reduced Ruminococcus and Allobaculum. Thus, SiNPs significantly regulate and modify the configuration of the gut microbiota in immunodeficient mice. These dynamic variations in the intestinal bacterial community, abundance, and diversity provide new insight into the regulation and administration of silica-based NPs. This would be helpful for the further demonstration of the mechanism of action and prediction of the potential effects of SiNPs.
Collapse
Affiliation(s)
- Sana Shabbir
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
| | - Yanzhou Hu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Xiaoyun He
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety) (MOA), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Kunlun Huang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety) (MOA), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Wentao Xu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety) (MOA), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| |
Collapse
|
2
|
ZC3H4 regulates infiltrating monocytes, attenuating pulmonary fibrosis through IL-10. Respir Res 2022; 23:204. [PMID: 35962397 PMCID: PMC9375388 DOI: 10.1186/s12931-022-02134-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 08/05/2022] [Indexed: 11/17/2022] Open
Abstract
Silicosis is a pulmonary fibrosis-associated disease caused by the inhalation of large amounts of free silicon dioxide (SiO2) that mainly manifests as early inflammation and late pulmonary fibrosis. As macrophage precursors, monocytes accumulate in the lung during early inflammation, but their role in the development of silicosis is unclear. Single-cell sequencing (cell numbers = 25,002), Western blotting, quantitative real-time PCR, ELISA and cell functional experiments were used to explore the specific effects of monocytes on fibroblasts. The CRISPR/Cas9 system was used to specifically knock down ZC3H4, a novel member of the CCCH zinc finger protein family, and was combined with pharmacological methods to explore the mechanism by which ZC3H4 affects chemokine and cytokine secretion. The results indicated that (1) SiO2 induced an infiltrating phenotype in monocytes; (2) infiltrating monocytes inhibited the activation, viability and migration of fibroblasts by regulating IL-10 but not IL-8; and (3) SiO2 downregulated IL-10 via ZC3H4-induced autophagy. This study revealed that ZC3H4 regulated the secretion function of monocytes, which, in turn, inhibited fibroblast function in early inflammation through autophagy signaling, thereby reducing pulmonary fibrosis. These findings provide a new idea for the clinical treatment of silicosis.
Collapse
|
3
|
Bhat AH, Dar KB, Khan A, Alshahrani S, Alshehri SM, Ghoneim MM, Alam P, Shakeel F. Tricyclodecan-9-yl-Xanthogenate (D609): Mechanism of Action and Pharmacological Applications. Int J Mol Sci 2022; 23:ijms23063305. [PMID: 35328726 PMCID: PMC8954530 DOI: 10.3390/ijms23063305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/14/2022] [Accepted: 03/16/2022] [Indexed: 12/04/2022] Open
Abstract
Tricyclodecan-9-yl xanthogenate (D609) is a synthetic tricyclic compound possessing a xanthate group. This xanthogenate compound is known for its diverse pharmacological properties. Over the last three decades, many studies have reported the biological activities of D609, including antioxidant, antiapoptotic, anticholinergic, anti-tumor, anti-inflammatory, anti-viral, anti-proliferative, and neuroprotective activities. Its mechanism of action is extensively attributed to its ability to cause the competitive inhibition of phosphatidylcholine (PC)-specific phospholipase C (PC-PLC) and sphingomyelin synthase (SMS). The inhibition of PCPLC or SMS affects secondary messengers with a lipidic nature, i.e., 1,2-diacylglycerol (DAG) and ceramide. Various in vitro/in vivo studies suggest that PCPLC and SMS inhibition regulate the cell cycle, block cellular proliferation, and induce differentiation. D609 acts as a pro-inflammatory cytokine antagonist and diminishes Aβ-stimulated toxicity. PCPLC enzymatic activity essentially requires Zn2+, and D609 might act as a potential chelator of Zn2+, thereby blocking PCPLC enzymatic activity. D609 also demonstrates promising results in reducing atherosclerotic plaque formation, post-stroke cerebral infarction, and cancer progression. The present compilation provides a comprehensive mechanistic insight into D609, including its chemistry, mechanism of action, and regulation of various pharmacological activities.
Collapse
Affiliation(s)
- Aashiq Hussain Bhat
- Department of Clinical Biochemistry, University of Kashmir, Srinagar 190006, India; (A.H.B.); (K.B.D.)
| | - Khalid Bashir Dar
- Department of Clinical Biochemistry, University of Kashmir, Srinagar 190006, India; (A.H.B.); (K.B.D.)
| | - Andleeb Khan
- Department of Pharmacology and Toxicology, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia;
- Correspondence: or
| | - Saeed Alshahrani
- Department of Pharmacology and Toxicology, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia;
| | - Sultan M. Alshehri
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (S.M.A.); (F.S.)
| | - Mohammed M. Ghoneim
- Department of Pharmacy Practice, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia;
| | - Prawez Alam
- Department of Pharmacognosy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia;
| | - Faiyaz Shakeel
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (S.M.A.); (F.S.)
| |
Collapse
|
4
|
Yang JY, Zhou WJ, Wang Q, Li Y, Yan YN, Wang YX, Wu SL, Wei WB. Retinal nerve fiber layer thickness and retinal vascular caliber alterations in coal miners in northern China: a community-based observational study. Int J Ophthalmol 2022; 15:135-140. [PMID: 35047368 DOI: 10.18240/ijo.2022.01.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 03/24/2021] [Indexed: 11/23/2022] Open
Abstract
AIM To evaluate retinal nerve fiber layer thickness and retinal vascular caliber alterations in coal mine workers. METHODS The community-based observational cross-sectional study included 4004 participants of a sub-population of the Kailuan Study. All the study participants underwent structured interviews with a standardized questionnaire, fundus photography and spectral-domain optical coherence tomography (OCT) examinations performed by trained doctors. RESULTS The retinal nerve fiber layer thickness was significantly higher (P=0.006) and the central macular thickness was lower in coal miners (n=659, 51.0±7.8y) as compared to the control (working above the ground; n=477, 51.8±7.5y; P=0.032). Additionally, the downhole workers showed a significantly thicker retinal artery (P=0.012) and vein diameters (P<0.001). In multivariable regression, a thicker retinal nerve fiber layer was associated with a higher cumulative silica dust exposure (P=0.005) after adjusting for younger age and larger spherical equivalent. In a reverse pattern, a higher cumulative silica dust exposure (P=0.004) was significantly associated with a thicker retinal nerve fiber layer after adjusting for age, high-density lipoproteins and uric acid. Wider retinal vein diameters were associated with higher cumulative silica dust exposure (P=0.036) after adjusting for younger age and larger spherical equivalent. CONCLUSION The retinal vessels diameters and retinal nerve fiber layer thickness are significantly thicker in long term of coal mining. The results of our study indicate that underground working environment may lead to retinal vessel dilation and inflammation. Thus, ocular examination might be needed within coal miners in order to monitor the occupational eye health as well as the incidence and progression of eye diseases.
Collapse
Affiliation(s)
- Jing-Yan Yang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology and Visual Science Key Lab, Beijing Key Laboratory of Intraocular Tumor Diagnosis and Treatment, Capital Medical University, Beijing 100730, China
| | - Wen-Jia Zhou
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology and Visual Science Key Lab, Beijing Key Laboratory of Intraocular Tumor Diagnosis and Treatment, Capital Medical University, Beijing 100730, China
| | - Qian Wang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology and Visual Science Key Lab, Beijing Key Laboratory of Intraocular Tumor Diagnosis and Treatment, Capital Medical University, Beijing 100730, China
| | - Yang Li
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology and Visual Science Key Lab, Beijing Key Laboratory of Intraocular Tumor Diagnosis and Treatment, Capital Medical University, Beijing 100730, China
| | - Yan-Ni Yan
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology and Visual Science Key Lab, Beijing Key Laboratory of Intraocular Tumor Diagnosis and Treatment, Capital Medical University, Beijing 100730, China
| | - Ya-Xing Wang
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University; Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Shou-Ling Wu
- Cardiology Department, Kailuan General Hospital, Tangshan 063000, Hebei Province, China
| | - Wen-Bin Wei
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology and Visual Science Key Lab, Beijing Key Laboratory of Intraocular Tumor Diagnosis and Treatment, Capital Medical University, Beijing 100730, China
| |
Collapse
|
5
|
Ma J, Zhang X, Song Y, Qin Y, Tan Y, Zheng L, Cheng B, Xi X. D609 inhibition of phosphatidylcholine-specific phospholipase C attenuates prolonged insulin stimulation-mediated GLUT4 downregulation in 3T3-L1 adipocytes. J Physiol Biochem 2022; 78:355-363. [PMID: 35048323 PMCID: PMC9242966 DOI: 10.1007/s13105-022-00872-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 01/06/2022] [Indexed: 11/30/2022]
Abstract
Glucose uptake is stimulated by insulin via stimulation of glucose transporter 4 (GLUT4) translocation to the plasma membrane from intracellular compartments in adipose tissue and muscles. Insulin stimulation for prolonged periods depletes GLUT4 protein, particularly in highly insulin-responsive GLUT4 storage vesicles. This depletion mainly occurs via H2O2-mediated retromer inhibition. However, the post-receptor mechanism of insulin activation of oxidative stress remains unknown. Here, we show that phosphatidylcholine-specific phospholipase C (PC-PLC) plays an important role in insulin-mediated downregulation of GLUT4. In the study, 3T3-L1 adipocytes were exposed to a PC-PLC inhibitor, tricyclodecan-9-yl-xanthogenate (D609), for 30 min prior to the stimulation with 500 nM insulin for 4 h, weakening the depletion of GLUT4. D609 also prevents insulin-driven H2O2 generation in 3T3-L1 adipocytes. Exogenous PC-PLC and its product, phosphocholine (PCho), also caused GLUT4 depletion and promoted H2O2 generation in 3T3-L1 adipocytes. Furthermore, insulin-mediated the increase in the cellular membrane PC-PLC activity was observed in Amplex Red assays. These results suggested that PC-PLC plays an important role in insulin-mediated downregulation of GLUT4 and that PCho may serve as a signaling molecule.
Collapse
Affiliation(s)
- Jinhui Ma
- Department of Endocrinology, Affiliated Hospital of Hebei University, Baoding, 071000, China
| | - Xu Zhang
- Baoding Maternal and Child Hospital, Baoding, 071000, China
| | - Yankun Song
- School of Medicine, Hebei University, Baoding, 071000, China
| | - Yan Qin
- Central Laboratory, Affiliated Hospital of Hebei University, Baoding, 071000, China
| | - Yinghui Tan
- Central Laboratory, Affiliated Hospital of Hebei University, Baoding, 071000, China
| | - Lishuang Zheng
- Central Laboratory, Affiliated Hospital of Hebei University, Baoding, 071000, China
| | - Baoqian Cheng
- School of Medicine, Hebei Medical University, Shijiazhuang, 050017, China
| | - Xin Xi
- Central Laboratory, Affiliated Hospital of Hebei University, Baoding, 071000, China.
| |
Collapse
|
6
|
Sager TM, Umbright CM, Mustafa GM, Yanamala N, Leonard HD, McKinney WG, Kashon ML, Joseph P. Tobacco Smoke Exposure Exacerbated Crystalline Silica-Induced Lung Toxicity in Rats. Toxicol Sci 2020; 178:375-390. [PMID: 32976597 PMCID: PMC7825013 DOI: 10.1093/toxsci/kfaa146] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Smoking may modify the lung response to silica exposure including cancer and silicosis. Nevertheless, the precise role of exposure to tobacco smoke (TS) on the lung response to crystalline silica (CS) exposure and the underlying mechanisms need further clarification. The objectives of the present study were to determine the role of TS on lung response to CS exposure and the underlying mechanism(s). Male Fischer 344 rats were exposed by inhalation to air, CS (15 mg/m3, 6 h/day, 5 days), TS (80 mg/m3, 3 h/day, twice weekly, 6 months), or CS (15 mg/m3, 6 h/day, 5 days) followed by TS (80 mg/m3, 3 h/day, twice weekly, 6 months). The rats were euthanized 6 months and 3 weeks following initiation of the first exposure and the lung response was assessed. Silica exposure resulted in significant lung toxicity as evidenced by lung histological changes, enhanced neutrophil infiltration, increased lactate dehydrogenase levels, enhanced oxidant production, and increased cytokine levels. The TS exposure alone had only a minimal effect on these toxicity parameters. However, the combined exposure to TS and CS exacerbated the lung response, compared with TS or CS exposure alone. Global gene expression changes in the lungs correlated with the lung toxicity severity. Bioinformatic analysis of the gene expression data demonstrated significant enrichment in functions, pathways, and networks relevant to the response to CS exposure which correlated with the lung toxicity detected. Collectively our data demonstrated an exacerbation of CS-induced lung toxicity by TS exposure and the molecular mechanisms underlying the exacerbated toxicity.
Collapse
Affiliation(s)
- Tina M Sager
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Christina M Umbright
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Gul Mehnaz Mustafa
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Naveena Yanamala
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Howard D Leonard
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Walter G McKinney
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Michael L Kashon
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Pius Joseph
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| |
Collapse
|
7
|
Sano A, Sano H, Iwanaga T, Tohda Y. Functional role of phosphatidylcholine-specific phospholipase C in regulating leukotriene synthesis and degranulation in human eosinophils. Eur J Pharmacol 2020; 884:173353. [PMID: 32707189 DOI: 10.1016/j.ejphar.2020.173353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 06/30/2020] [Accepted: 07/07/2020] [Indexed: 10/23/2022]
Abstract
Phosphatidylinositol-specific phospholipase C (PI-PLC) and cytosolic phospholipase A2 (cPLA2) regulate both eosinophil degranulation and leukotriene (LT) synthesis via PI-PLC-mediated calcium influx and cPLA2 activation. Phosphatidylcholine-specific phospholipase C (PC-PLC) likely plays a key role in cellular signaling, including the eosinophilic allergic inflammatory response. This study examined the role of PC-PLC in eosinophil LT synthesis and degranulation using tricyclodecan-9-yl-xanthogenate (D609), a PC-specific PLC inhibitor. D609 inhibited N-formyl-met-leu-phe + cytochalasin B (fMLP/B)-induced arachidonic acid (AA) release and leukotriene C4 (LTC4) secretion. However, at concentrations that blocked both AA release and LTC4 secretion, D609 had no significant inhibitory effect on stimulated cPLA2 activity. D609 also partially blocked fMLP/B-induced calcium influx, indicating that inhibition of AA release and LTC4 secretion by D609 is due to inhibition of calcium-mediated cPLA2 translocation to intracellular membranes, not inhibition of cPLA2 activity. In addition, D609 inhibited fMLP/B-stimulated eosinophil peroxidase release, indicating that PC-PLC regulates fMLP/B-induced eosinophil degranulation by increasing the intracellular calcium concentration ([Ca2+]i). Overall, our results showed that PC-PLC is critical for fMLP/B-stimulated eosinophil LT synthesis and degranulation. In addition, degranulation requires calcium influx, while PC-PLC regulates LTC4 synthesis through calcium-mediated cPLA2 activation.
Collapse
Affiliation(s)
- Akiko Sano
- Department of Respiratory Medicine and Allergology, Kindai University Faculty of Medicine, 377-2, Ohnohigashi Osakasayama, Osaka, 589-8511, Japan.
| | - Hiroyuki Sano
- Department of Respiratory Medicine and Allergology, Kindai University Faculty of Medicine, 377-2, Ohnohigashi Osakasayama, Osaka, 589-8511, Japan
| | - Takashi Iwanaga
- Department of Respiratory Medicine and Allergology, Kindai University Faculty of Medicine, 377-2, Ohnohigashi Osakasayama, Osaka, 589-8511, Japan
| | - Yuji Tohda
- Department of Respiratory Medicine and Allergology, Kindai University Faculty of Medicine, 377-2, Ohnohigashi Osakasayama, Osaka, 589-8511, Japan
| |
Collapse
|
8
|
Řezanka T, Řezanka M, Mezricky D, Vítová M. Lipidomic analysis of diatoms cultivated with silica nanoparticles. PHYTOCHEMISTRY 2020; 177:112452. [PMID: 32773085 DOI: 10.1016/j.phytochem.2020.112452] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/16/2020] [Accepted: 06/20/2020] [Indexed: 06/11/2023]
Abstract
Polar lipids from the diatoms Diadesmis gallica and Navicula atomus were separated and their structures were determined using high resolution tandem MS HILIC-LC/ESI. This method allowed us to identify 34 classes of lipids, each containing dozens of molecular species, including regioisomers. The largest differences were found in two sulfur-containing lipids, sulfoquinovosyldiacylglycerol and phosphatidylsulfocholine caused probably by the remodeling of lipid species. These diatoms have been found to use several mechanisms to resolve growth in extreme environments, i.e. silica starvation. The presence of insoluble nano-SiO2 leads to the replacement of cellular phospholipids with sulfolipids. Regioisomer ratios also vary depending on the concentration of nano-SiO2 in the culture medium, i.e. the biosynthesis of polar lipids via the prokaryotic (plastidial) and/or eukaryotic (explastidial) pathways. Complex analyses of polar lipids using high resolution HILIC-LC/ESI-tandem, as used for diatoms, can also be used for other photosynthetic microorganisms.
Collapse
Affiliation(s)
- Tomáš Řezanka
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague, Czech Republic.
| | - Michal Řezanka
- Department of Nanochemistry, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec 1, Czech Republic
| | - Dana Mezricky
- Medical and Pharmaceutical Biotechnology, IMC University of Applied Sciences, Piaristengasse1, 3500, Krems, Austria
| | - Milada Vítová
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Laboratory of Cell Cycles of Algae, Novohradská 237, 379 81, Třeboň, Czech Republic
| |
Collapse
|
9
|
Zhao J, Lin Y, Zhao Y, Wang Y, Ning C, Ma Y, Meng X. Polyphenol-rich blue honeysuckle extract alleviates silica particle-induced inflammatory responses and macrophage apoptosis via NRF2/HO-1 and MAPK signaling. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.05.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
|
10
|
TAK1 inhibition attenuates both inflammation and fibrosis in experimental pneumoconiosis. Cell Discov 2017; 3:17023. [PMID: 28698801 PMCID: PMC5504492 DOI: 10.1038/celldisc.2017.23] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 06/05/2017] [Indexed: 12/12/2022] Open
Abstract
Pneumoconiosis, caused by inhalation of mineral dusts, is a major occupational disease worldwide. Currently, there are no effective drugs owing to a lack of potential therapeutic targets during either the inflammation or fibrosis molecular events in pneumoconiosis. Here, we performed microarrays to identify aberrantly expressed genes in the above molecular events in vitro and found a hub gene transforming growth factor-β-activated kinase 1 (TAK1), which was highly expressed and activated in pneumoconiosis patients as well as silica-exposed rats with experimental pneumoconiosis. Genetic modulation of TAK1 by CRISPR (clustered regularly interspaced short palindromic repeats)/Cas9, RNA interference and overexpression indicated the important role of TAK1 in both inflammation and fibrosis in experimental pneumoconiosis. To achieve pharmacological TAK1 inhibition, we virtually screened out a natural product resveratrol, which targeted TAK1 at both N161 and A107 residues, and significantly inhibited TAK1 activation to attenuate inflammation and fibrosis in vitro. Consistently, in vivo prevention and intervention studies showed that resveratrol could inhibit pulmonary inflammation and fibrosis in silica-exposed rats.
Collapse
|
11
|
Malczyk M, Erb A, Veith C, Ghofrani HA, Schermuly RT, Gudermann T, Dietrich A, Weissmann N, Sydykov A. The Role of Transient Receptor Potential Channel 6 Channels in the Pulmonary Vasculature. Front Immunol 2017; 8:707. [PMID: 28670316 PMCID: PMC5472666 DOI: 10.3389/fimmu.2017.00707] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 05/31/2017] [Indexed: 01/21/2023] Open
Abstract
Canonical or classical transient receptor potential channel 6 (TRPC6) is a Ca2+-permeable non-selective cation channel that is widely expressed in the heart, lung, and vascular tissues. The use of TRPC6-deficient (“knockout”) mice has provided important insights into the role of TRPC6 in normal physiology and disease states of the pulmonary vasculature. Evidence indicates that TRPC6 is a key regulator of acute hypoxic pulmonary vasoconstriction. Moreover, several studies implicated TRPC6 in the pathogenesis of pulmonary hypertension. Furthermore, a unique genetic variation in the TRPC6 gene promoter has been identified, which might link the inflammatory response to the upregulation of TRPC6 expression and ultimate development of pulmonary vascular abnormalities in idiopathic pulmonary arterial hypertension. Additionally, TRPC6 is critically involved in the regulation of pulmonary vascular permeability and lung edema formation during endotoxin or ischemia/reperfusion-induced acute lung injury. In this review, we will summarize latest findings on the role of TRPC6 in the pulmonary vasculature.
Collapse
Affiliation(s)
- Monika Malczyk
- Excellence Cluster Cardio-Pulmonary System, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Justus Liebig University of Giessen, Giessen, Germany
| | - Alexandra Erb
- Excellence Cluster Cardio-Pulmonary System, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Justus Liebig University of Giessen, Giessen, Germany
| | - Christine Veith
- Excellence Cluster Cardio-Pulmonary System, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Justus Liebig University of Giessen, Giessen, Germany
| | - Hossein Ardeschir Ghofrani
- Excellence Cluster Cardio-Pulmonary System, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Justus Liebig University of Giessen, Giessen, Germany
| | - Ralph T Schermuly
- Excellence Cluster Cardio-Pulmonary System, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Justus Liebig University of Giessen, Giessen, Germany
| | - Thomas Gudermann
- Walther Straub Institute for Pharmacology and Toxicology, Ludwig Maximilian University of Munich, German Center for Lung Research (DZL), Munich, Germany
| | - Alexander Dietrich
- Walther Straub Institute for Pharmacology and Toxicology, Ludwig Maximilian University of Munich, German Center for Lung Research (DZL), Munich, Germany
| | - Norbert Weissmann
- Excellence Cluster Cardio-Pulmonary System, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Justus Liebig University of Giessen, Giessen, Germany
| | - Akylbek Sydykov
- Excellence Cluster Cardio-Pulmonary System, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Justus Liebig University of Giessen, Giessen, Germany
| |
Collapse
|
12
|
Premshekharan G, Nguyen K, Zhang H, Forman HJ, Leppert VJ. Low dose inflammatory potential of silica particles in human-derived THP-1 macrophage cell culture studies - Mechanism and effects of particle size and iron. Chem Biol Interact 2017; 272:160-171. [PMID: 28512001 DOI: 10.1016/j.cbi.2017.05.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 04/22/2017] [Accepted: 05/03/2017] [Indexed: 11/16/2022]
Abstract
Silica and iron are major constituents in ambient particulate matter, and iron is a common impurity in many engineered nanomaterials. The purpose of this work was to determine the pro-inflammatory and other biological effects and mechanism of particle size and iron presence under low dose, non-cytotoxic conditions that are likely to approximate actual exposure levels, in contrast with higher dose studies in which cytotoxicity occurs. Specifically, human-derived THP-1 macrophages were exposed to 1 μg/ml of pristine and iron-coated 50 nm and 2 μm engineered silica nanoparticles. Particles were first characterized for size, size distribution, surface area, iron concentration, phase and aggregation in cell culture media. Then, biological assays were conducted to determine a non-lethal dose used in subsequent experiments. Superoxide production, lipid peroxidation, and increased pro-inflammatory cytokine (TNF-α and IL-1β) mRNA expression were measured as a function of particle size and iron presence. Smaller particle size and the presence of iron increased superoxide production, lipid peroxidation, and the induction of pro-inflammatory cytokine mRNA expression. Separate addition of an iron-chelator, a scavenger of superoxide and hydrogen peroxide, and an inhibitor of phosphatidylcholine specific phospholipase C (PC-PLC), suppressed the increase in cytokine mRNA expression. Furthermore, free iron itself showed none of the aforementioned effects. The results highlight the importance of particle size and iron in lung inflammation for both natural and engineered nanomaterials, under low dose, non-toxic conditions, and support the role of an oxidant, lipid peroxidation and PC-PLC dependent inflammatory mechanism.
Collapse
Affiliation(s)
- Gayatri Premshekharan
- School of Engineering, University of California, 5200 N. Lake Rd., Merced, CA 95343, United States
| | - Kennedy Nguyen
- School of Engineering, University of California, 5200 N. Lake Rd., Merced, CA 95343, United States
| | - Hongqiao Zhang
- School of Natural Sciences, University of California, 5200 N. Lake Rd., Merced, CA 95343, United States; Davis School of Gerontology, University of Southern California, 3715 McClintock Ave, Los Angeles, CA 90089, United States
| | - Henry Jay Forman
- School of Natural Sciences, University of California, 5200 N. Lake Rd., Merced, CA 95343, United States; Davis School of Gerontology, University of Southern California, 3715 McClintock Ave, Los Angeles, CA 90089, United States
| | - Valerie Jean Leppert
- School of Engineering, University of California, 5200 N. Lake Rd., Merced, CA 95343, United States.
| |
Collapse
|
13
|
Shad MK, Barkhordari A, Mehrparvar AH, Dehghani A, Ranjbar A, Moghadam RH. Oxidative toxic stress in workers occupationally exposed to ceramic dust: A study in a ceramic manufacturing industry. Work 2016; 55:13-17. [DOI: 10.3233/wor-162384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Mehri Keshvari Shad
- Department of Occupational Health Engineering, School of Public Health, Yazd University of Medical Sciences, Yazd, Iran
| | - Abolfaz Barkhordari
- Department of Occupational Health Engineering, School of Public Health, Yazd University of Medical Sciences, Yazd, Iran
| | - Amir Houshang Mehrparvar
- Department of Occupational Health Engineering, School of Public Health, Yazd University of Medical Sciences, Yazd, Iran
| | - Ali Dehghani
- Department of Occupational Health Engineering, School of Public Health, Yazd University of Medical Sciences, Yazd, Iran
| | - Akram Ranjbar
- Department of Toxicology and Pharmacology, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Rashid Heidari Moghadam
- Department of Ergonomics, School of Health, Hamadan University of Medical Sciences, Hamadan, Iran
| |
Collapse
|
14
|
Forman HJ. Redox signaling: An evolution from free radicals to aging. Free Radic Biol Med 2016; 97:398-407. [PMID: 27393004 PMCID: PMC4996735 DOI: 10.1016/j.freeradbiomed.2016.07.003] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 06/30/2016] [Accepted: 07/04/2016] [Indexed: 12/11/2022]
Abstract
Redox biology has evolved from studies of the pathology that involves oxidants to an understanding of how oxidants participate in normal as well as aberrant signal transduction. Although the concept that signal transduction involved changes in the redox state dates from the 1930s, the modern history of redox biology began with the discovery of superoxide dismutase by McCord and Fridovich. The initial focus was on free radicals and damage of macromolecules, which remains an important topic. But, over time it was realized that hydroperoxides, especially H2O2 produced by NADPH oxidases, and electrophiles derived from lipid peroxidation or metabolism, played essential roles in physiologically relevant signaling. The mechanisms through which H2O2 and other electrophiles signal became an important area of study that provided insight into how these reactive molecules were involved in major signaling pathways and regulation of transcription factors. Thus, the field of redox signaling that is the overlap of signal transduction with redox biology was established. Alterations in redox signaling are observed in aging, but we also now know that redox signaling is essential in physiological homeostasis and that sustained deviation from redox homeostasis results in disease. This is a review of the history of redox biology from a personal perspective of nearly fifty years working in this field that hopefully provides some insights for the reader.
Collapse
Affiliation(s)
- Henry Jay Forman
- Leonard Davis School of Gerontology, University of Southern California, 3715 McClintock Avenue, Los Angeles, CA 90089, United States
| |
Collapse
|
15
|
Kundu S. Stochastic modelling suggests that an elevated superoxide anion - hydrogen peroxide ratio can drive extravascular phagocyte transmigration by lamellipodium formation. J Theor Biol 2016; 407:143-154. [PMID: 27380944 DOI: 10.1016/j.jtbi.2016.07.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 07/01/2016] [Indexed: 11/24/2022]
Abstract
Chemotaxis, integrates diverse intra- and inter-cellular molecular processes into a purposeful patho-physiological response; the operatic rules of which, remain speculative. Here, I surmise, that superoxide anion induced directional motility, in a responding cell, results from a quasi pathway between the stimulus, surrounding interstitium, and its biochemical repertoire. The epochal event in the mounting of an inflammatory response, is the extravascular transmigration of a phagocyte competent cell towards the site of injury, secondary to the development of a lamellipodium. This stochastic-to-markovian process conversion, is initiated by the cytosolic-ROS of the damaged cell, but is maintained by the inverse association of a de novo generated pool of self-sustaining superoxide anions and sub-critical hydrogen peroxide levels. Whilst, the exponential rise of O2(.-) is secondary to the focal accumulation of higher order lipid raft-Rac1/2-actin oligomers; O2(.-) mediated inactivation and redistribution of ECSOD, accounts for the minimal concentration of H2O2 that the phagocyte experiences. The net result of this reciprocal association between ROS/ RNS members, is the prolonged perturbation and remodeling of the cytoskeleton and plasma membrane, a prelude to chemotactic migration. The manuscript also describes the significance of stochastic modeling, in the testing of plausible molecular hypotheses of observable phenomena in complex biological systems.
Collapse
Affiliation(s)
- Siddhartha Kundu
- Department of Biochemistry, Dr. Baba Saheb Ambedkar Medical College & Hospital, Government of NCT Delhi, Sector - 6, Rohini, Delhi 110085, India; Mathematical and Computational Biology, Information Technology Research Academy (ITRA), Media Lab Asia, 2nd Floor, Block 2, C-DOT Campus, Mehrauli, New Delhi 110030, India; School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi 110067, India.
| |
Collapse
|
16
|
Different reactivity of primary fibroblasts and endothelial cells towards crystalline silica: A surface radical matter. Toxicology 2016; 361-362:12-23. [PMID: 27381660 DOI: 10.1016/j.tox.2016.07.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 06/30/2016] [Accepted: 07/01/2016] [Indexed: 11/23/2022]
|
17
|
Ursini F, Maiorino M, Forman HJ. Redox homeostasis: The Golden Mean of healthy living. Redox Biol 2016; 8:205-15. [PMID: 26820564 PMCID: PMC4732014 DOI: 10.1016/j.redox.2016.01.010] [Citation(s) in RCA: 256] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 01/15/2016] [Accepted: 01/18/2016] [Indexed: 12/20/2022] Open
Abstract
The notion that electrophiles serve as messengers in cell signaling is now widely accepted. Nonetheless, major issues restrain acceptance of redox homeostasis and redox signaling as components of maintenance of a normal physiological steady state. The first is that redox signaling requires sudden switching on of oxidant production and bypassing of antioxidant mechanisms rather than a continuous process that, like other signaling mechanisms, can be smoothly turned up or down. The second is the misperception that reactions in redox signaling involve “reactive oxygen species” rather than reaction of specific electrophiles with specific protein thiolates. The third is that hormesis provides protection against oxidants by increasing cellular defense or repair mechanisms rather than by specifically addressing the offset of redox homeostasis. Instead, we propose that both oxidant and antioxidant signaling are main features of redox homeostasis. As the redox shift is rapidly reversed by feedback reactions, homeostasis is maintained by continuous signaling for production and elimination of electrophiles and nucleophiles. Redox homeostasis, which is the maintenance of nucleophilic tone, accounts for a healthy physiological steady state. Electrophiles and nucleophiles are not intrinsically harmful or protective, and redox homeostasis is an essential feature of both the response to challenges and subsequent feedback. While the balance between oxidants and nucleophiles is preserved in redox homeostasis, oxidative stress provokes the establishment of a new radically altered redox steady state. The popular belief that scavenging free radicals by antioxidants has a beneficial effect is wishful thinking. We propose, instead, that continuous feedback preserves nucleophilic tone and that this is supported by redox active nutritional phytochemicals. These nonessential compounds, by activating Nrf2, mimic the effect of endogenously produced electrophiles (parahormesis). In summary, while hormesis, although globally protective, results in setting up of a new phenotype, parahormesis contributes to health by favoring maintenance of homeostasis. Redox homeostasis is the continuously challenged oxidative/nucleophilic balance. Rheostatic redox signaling enzymes maintain oxidative/nucleophilic homeostasis. Phytochemicals assist redox homeostasis through oxidative feedback (parahormesis). Adaptation and hormesis while protective establish a new phenotype and set point.
Collapse
Affiliation(s)
- Fulvio Ursini
- Department of Molecular Medicine, University of Padova, Viale G. Colombo 3, I-35121 Padova, Italy
| | - Matilde Maiorino
- Department of Molecular Medicine, University of Padova, Viale G. Colombo 3, I-35121 Padova, Italy
| | - Henry Jay Forman
- Andrus Gerontology Center of the Davis School of Gerontology, University of Southern, California, 3715 McClintock Ave, Los Angeles, CA 90089-0191, USA
| |
Collapse
|
18
|
Sommer N, Strielkov I, Pak O, Weissmann N. Oxygen sensing and signal transduction in hypoxic pulmonary vasoconstriction. Eur Respir J 2015; 47:288-303. [PMID: 26493804 DOI: 10.1183/13993003.00945-2015] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 08/24/2015] [Indexed: 01/17/2023]
Abstract
Hypoxic pulmonary vasoconstriction (HPV), also known as the von Euler-Liljestrand mechanism, is an essential response of the pulmonary vasculature to acute and sustained alveolar hypoxia. During local alveolar hypoxia, HPV matches perfusion to ventilation to maintain optimal arterial oxygenation. In contrast, during global alveolar hypoxia, HPV leads to pulmonary hypertension. The oxygen sensing and signal transduction machinery is located in the pulmonary arterial smooth muscle cells (PASMCs) of the pre-capillary vessels, albeit the physiological response may be modulated in vivo by the endothelium. While factors such as nitric oxide modulate HPV, reactive oxygen species (ROS) have been suggested to act as essential mediators in HPV. ROS may originate from mitochondria and/or NADPH oxidases but the exact oxygen sensing mechanisms, as well as the question of whether increased or decreased ROS cause HPV, are under debate. ROS may induce intracellular calcium increase and subsequent contraction of PASMCs via direct or indirect interactions with protein kinases, phospholipases, sarcoplasmic calcium channels, transient receptor potential channels, voltage-dependent potassium channels and L-type calcium channels, whose relevance may vary under different experimental conditions. Successful identification of factors regulating HPV may allow development of novel therapeutic approaches for conditions of disturbed HPV.
Collapse
Affiliation(s)
- Natascha Sommer
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Ievgen Strielkov
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Oleg Pak
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Norbert Weissmann
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| |
Collapse
|
19
|
Shimizu Y, Dobashi K, Nagase H, Ohta K, Sano T, Matsuzaki S, Ishii Y, Satoh T, Koka M, Yokoyama A, Ohkubo T, Ishii Y, Kamiya T. Co-localization of iron binding on silica with p62/sequestosome1 (SQSTM1) in lung granulomas of mice with acute silicosis. J Clin Biochem Nutr 2014; 56:74-83. [PMID: 25834305 PMCID: PMC4306660 DOI: 10.3164/jcbn.14-44] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 09/02/2014] [Indexed: 01/05/2023] Open
Abstract
The cellular mechanisms involved in the development of silicosis have not been fully elucidated. This study aimed to examine influence of silica-induced lung injury on autophagy. Suspensions of crystalline silica particles were administered transnasally to C57BL/6j mice. Immunohistochemical examination for Fas and p62 protein expression was performed using lung tissue specimens. Two-dimensional and quantitative analysis of silica deposits in the lungs were performed in situ using lung tissue sections by an in-air microparticle induced X-ray emission (in-air micro-PIXE) analysis system, which was based on irrradiation of specimens with a proton ion microbeam. Quantitative analysis showed a significant increase of iron levels on silica particles (assessed as the ratio of Fe relative to Si) on day 56 compared with day 7 (p<0.05). Fas and p62 were expressed by histiocytes in granulomas on day 7, and the expressions persisted for day 56. Fas- and p62-expressing histiocytes were co-localized in granulomas with silica particles that showed an increase of iron levels on silica particles in mouse lungs. Iron complexed with silica induces apoptosis, and may lead to dysregulations of autophagy in histiocytes of granulomas, and these mechanisms may contribute to granuloma development and progression in silicosis.
Collapse
Affiliation(s)
- Yasuo Shimizu
- Department of Pulmonary Medicine and Clinical Immunology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu-machi, Tochigi 321-0293, Japan ; Department of Respiratory Medicine, Maebashi Red Cross Hospital, 3-21-36 Asahi-cho, Maebashi-shi, Tochigi 371-0014, Japan ; Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, 3-39-15 Showa-machi, Maebashi-shi, Gunma 371-8511, Japan
| | - Kunio Dobashi
- Gunma University School of Health Sciences, 3-39-22 Showa-machi, Maebashi-shi, Gunma 371-8514, Japan
| | - Hiroyuki Nagase
- Division of Respiratory Medicine and Allergology, Department of Medicine, Teikyo University School of Medicine, 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan
| | - Ken Ohta
- Department of Respiratory Diseases, National Hospital Organization Tokyo National Hospital, Tokyo, 3-1-1 Takeoka, Kiyose-shi, Tokyo 204-8585, Japan
| | - Takaaki Sano
- Department of Diagnostic Pathology, Gunma University Graduate School of Medicine, 3-39-15 Showa-machi, Maebashi-shi, Gunma 371-8511, Japan
| | - Shinichi Matsuzaki
- Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, 3-39-15 Showa-machi, Maebashi-shi, Gunma 371-8511, Japan
| | - Yoshiki Ishii
- Department of Pulmonary Medicine and Clinical Immunology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu-machi, Tochigi 321-0293, Japan
| | - Takahiro Satoh
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, 1233 Watanuki-machi, Takasaki-shi, Gunma 370-1292, Japan
| | - Masashi Koka
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, 1233 Watanuki-machi, Takasaki-shi, Gunma 370-1292, Japan
| | - Akihito Yokoyama
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, 1233 Watanuki-machi, Takasaki-shi, Gunma 370-1292, Japan
| | - Takeru Ohkubo
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, 1233 Watanuki-machi, Takasaki-shi, Gunma 370-1292, Japan
| | - Yasuyuki Ishii
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, 1233 Watanuki-machi, Takasaki-shi, Gunma 370-1292, Japan
| | - Tomihiro Kamiya
- Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, 1233 Watanuki-machi, Takasaki-shi, Gunma 370-1292, Japan
| |
Collapse
|
20
|
Targeting annexin A7 by a small molecule suppressed the activity of phosphatidylcholine-specific phospholipase C in vascular endothelial cells and inhibited atherosclerosis in apolipoprotein E⁻/⁻mice. Cell Death Dis 2013; 4:e806. [PMID: 24052074 PMCID: PMC3789175 DOI: 10.1038/cddis.2013.317] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 07/24/2013] [Accepted: 07/29/2013] [Indexed: 02/04/2023]
Abstract
Phosphatidylcholine-specific phospholipase C (PC-PLC) is a key factor in apoptosis and autophagy of vascular endothelial cells (VECs), and involved in atherosclerosis in apolipoprotein E⁻/⁻ (apoE⁻/⁻) mice. But the endogenous regulators of PC-PLC are not known. We recently found a small chemical molecule (6-amino-2, 3-dihydro-3-hydroxymethyl-1, 4-benzoxazine, ABO) that could inhibit oxidized low-density lipoprotein (oxLDL)-induced apoptosis and promote autophagy in VECs, and further identified ABO as an inhibitor of annexin A7 (ANXA7) GTPase. Based on these findings, we hypothesize that ANXA7 is an endogenous regulator of PC-PLC, and targeting ANXA7 by ABO may inhibit atherosclerosis in apoE⁻/⁻ mice. In this study, we tested our hypothesis. The results showed that ABO suppressed oxLDL-induced increase of PC-PLC level and activity and promoted the co-localization of ANXA7 and PC-PLC in VECs. The experiments of ANXA7 knockdown and overexpression demonstrated that the action of ABO was ANXA7-dependent in cultured VECs. To investigate the relation of ANXA7 with PC-PLC in atherosclerosis, apoE⁻/⁻ mice fed with a western diet were treated with 50 or 100 mg/kg/day ABO. The results showed that ABO decreased PC-PLC levels in the mouse aortic endothelium and PC-PLC activity in serum, and enhanced the protein levels of ANXA7 in the mouse aortic endothelium. Furthermore, both dosages of ABO significantly enhanced autophagy and reduced apoptosis in the mouse aortic endothelium. As a result, ABO significantly reduced atherosclerotic plaque area and effectively preserved a stable plaques phenotype, including reduced lipid deposition and pro-inflammatory macrophages, increased anti-inflammatory macrophages, collagen content and smooth muscle cells, and less cell death in the plaques. In conclusion, ANXA7 was an endogenous regulator of PC-PLC, and targeting ANXA7 by ABO inhibited atherosclerosis in apoE⁻/⁻ mice.
Collapse
|
21
|
Wang L, Li H, Zhang J, Lu W, Zhao J, Su L, Zhao B, Zhang Y, Zhang S, Miao J. Phosphatidylethanolamine binding protein 1 in vacular endothelial cell autophagy and atherosclerosis. J Physiol 2013; 591:5005-15. [PMID: 23959677 DOI: 10.1113/jphysiol.2013.262667] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
We previously found that phosphatidylcholine-specific phospholipase C (PC-PLC) was a key inducing element of atherosclerosis, and might negatively regulate human umbilical vein endothelial cell (HUVEC) autophagy. To further investigate the mechanism of PC-PLC action, we initially identified phosphatidylethanolamine binding protein 1 (PEBP1) as a binding partner of PC-PLC by using mass spectrometry (MS, MALDI-TOF/TOF). We found that PEBP1 positively regulated PC-PLC activity in HUVECs, and inhibition of PC-PLC by its inhibitor D609 suppressed PEBP1 expression dramatically. Moreover, both PC-PLC and PEBP1 negatively regulated HUVEC autophagy independently of mammalian target of rapamycin (mTOR). Furthermore, the PEBP1 level was elevated during the development of atherosclerosis, while D609 significantly decreased the upregulated PEBP1 level in apoE(-/-) mice.
Collapse
Affiliation(s)
- Li Wang
- J. Y. Miao and B. X. Zhao: Institute of Developmental Biology, School of Life Science, Shandong University, Jinan 250100, China. Emails: and
| | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Strielkov I, Kizub I, Khromov A, Soloviev A. Evidence for the role of phosphatidylcholine-specific phospholipase C in sustained hypoxic pulmonary vasoconstriction. Vascul Pharmacol 2013; 58:292-8. [DOI: 10.1016/j.vph.2013.02.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 01/31/2013] [Accepted: 02/04/2013] [Indexed: 11/29/2022]
|
23
|
Staiano RI, Granata F, Secondo A, Petraroli A, Loffredo S, Annunziato L, Triggiani M, Marone G. Human macrophages and monocytes express functional Na(+)/Ca (2+) exchangers 1 and 3. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 961:317-26. [PMID: 23224891 DOI: 10.1007/978-1-4614-4756-6_27] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The Na(+)/Ca(2+) exchanger (NCX) is a plasma membrane protein that can switch Na(+) and Ca(2+) in either direction to maintain the homeostasis of intracellular Ca(2+). A family of three genes (NCX1, NCX2, and NCX3) has been identified in neurons and muscle cells. NCX activity has also been reported in certain immune cells (e.g., mast cells). We have examined the expression and function of these NCX isoforms in the human monocytes and lung macrophages. Monocytes were purified from peripheral blood of healthy donors. Macrophages (HLM) were isolated and purified from the lung parenchyma of patients undergoing thoracic surgery. NCX1 and NCX3, but not NCX2, were expressed in HLM and monocytes at both mRNA and protein level. Exposure to Na(+)-free medium induced a significant increase in intracellular calcium concentration ([Ca(2+)](i)) in both cell types, suggesting that NCX isoforms expressed on these cells were functionally active. This response was completely abolished by the NCX inhibitor 5-(N-4-chlorobenzyl)-20,40-dimethylbenzamil (CB-DMB). In addition, incubation of macrophages with Na(+)-free medium induced a marked release of TNF-α. Preincubation of HLM with CB-DMB and RNAi-mediated knockdown of NCX1 blocked TNF-α release. Our results demonstrate that human macrophages and monocytes express NCX1 and NCX3 that operate in a bidirectional manner to restore [Ca(2+)](i) to generate Ca(2+) signals and to induce TNF-α production. We suggest that NCX may modulate Ca(2+) homeostasis and proinflammatory functions in human macrophages and monocytes.
Collapse
|
24
|
Zhang H, Liu H, Davies KJ, Sioutas C, Finch CE, Morgan TE, Forman HJ. Nrf2-regulated phase II enzymes are induced by chronic ambient nanoparticle exposure in young mice with age-related impairments. Free Radic Biol Med 2012; 52:2038-46. [PMID: 22401859 PMCID: PMC3342863 DOI: 10.1016/j.freeradbiomed.2012.02.042] [Citation(s) in RCA: 122] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Revised: 01/30/2012] [Accepted: 02/25/2012] [Indexed: 01/05/2023]
Abstract
Many xenobiotic detoxifying (phase II) enzymes are induced by sublethal doses of environmental toxicants. However, these adaptive mechanisms have not been studied in response to vehicular-derived airborne nano-sized particulate matter (nPM). Because aging is associated with increased susceptibility to environmental toxicants, we also examined the expression of Nrf2-regulated phase II genes in middle-aged mice and their inducibility by chronic nPM. The nPM from vehicular traffic was collected in urban Los Angeles and reaerosolized for exposure of C57BL/6J male mice (3 and 18 months old) for 150 h over 10 weeks. Brain (cerebellum), liver, and lung were assayed by RT-PCR and/or Western blots for the expression of phase II enzymes, glutamate cysteine ligase (catalytic GCLC, and modifier GCLM subunits), NAD(P)H:quinone oxidoreductase 1 (NQO1), heme oxygenase 1 (HO-1), and relevant transcription factors, NF-E2-related factor 2 (Nrf2), c-Myc, Bach1. Chronic nPM exposure induced GCLC, GCLM, HO-1, NQO1 mRNA, and protein similarly in cerebellum, liver, and lung of young mice. Middle-aged mice had elevated basal levels, but showed impaired further induction by nPM. Similarly, Nrf2 increased with age and was induced by nPM in young but not old. c-Myc showed the same age and induction profile while the age increase in Bach1 was further induced by nPM. Chronic exposure to nanoparticles induced Nrf2-regulated detoxifying enzymes in brain (cerebellum), liver, and lung of young adult mice, indicating a systemic impact of nPM. In contrast, middle-aged mice did not respond above their elevated basal levels except for Bach1. The lack of induction of phase II enzymes in aging mice may be a model for the vulnerability of elderly to air pollution.
Collapse
Affiliation(s)
- Hongqiao Zhang
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089
| | - Honglei Liu
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089
| | - Kelvin J.A. Davies
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089
| | - Constantinos Sioutas
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089
| | - Caleb E. Finch
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089
| | - Todd E. Morgan
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089
| | - Henry Jay Forman
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089
- University of California at Merced, Merced, CA 95343
| |
Collapse
|
25
|
Poland CA, Byrne F, Cho WS, Prina-Mello A, Murphy FA, Davies GL, Coey JMD, Gounko Y, Duffin R, Volkov Y, Donaldson K. Length-dependent pathogenic effects of nickel nanowires in the lungs and the peritoneal cavity. Nanotoxicology 2011; 6:899-911. [PMID: 22023084 DOI: 10.3109/17435390.2011.626535] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The use of fibre-shaped nanomaterials in commercial applications has met with concern that they could cause health effects similar to those seen with pathogenic fibres such as certain forms of asbestos. Of the attributes which form the fibre pathogenicity paradigm, fibre length is thought to be a critical factor in determining fibre toxicity. We have previously shown that carbon nanotubes display such length-dependent pathogenicity but it remains unclear if other forms of fibrous nanomaterials conform to the fibre pathogenicity paradigm. As such, our aim is to determine the generality of this hypothesis by asking whether a radically different form of fibrous nanomaterial, nickel nanowires, show length-dependent pathogenicity. Our results indicate that nickel nanowires synthesised to be predominantly long (>20 μm) show the ability to elicit strong inflammation in the mouse peritoneal model in a dose-dependent manner; inflammation or fibrosis was not seen with the short (<5 μm) nanowires. This length-dependent response was also seen after lung aspiration and within a macrophage in vitro model adding further weight to the contention that fibre length is an important driver of hazard potential. This may have important implications when considering the hazard posed by fibrous nanomaterials and their regulation in workplaces.
Collapse
Affiliation(s)
- Craig A Poland
- Safenano, Institute of Occupational Medicine, Riccarton, Edinburgh, UK.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Premasekharan G, Nguyen K, Contreras J, Ramon V, Leppert VJ, Forman HJ. Iron-mediated lipid peroxidation and lipid raft disruption in low-dose silica-induced macrophage cytokine production. Free Radic Biol Med 2011; 51:1184-94. [PMID: 21741475 DOI: 10.1016/j.freeradbiomed.2011.06.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Revised: 05/04/2011] [Accepted: 06/09/2011] [Indexed: 11/23/2022]
Abstract
Silica inhalation can induce respiratory disease. Iron is suspected of playing an important role in silica-mediated respiratory toxicity, but unambiguously determining its role has been hampered by incomplete characterization, use of high particle doses, and lack of understanding of proinflammatory mechanisms. In this study, we investigated a novel hypothesis for the mechanism of silica particle-induced increase in cytokine production. We studied the role of iron in lipid peroxidation-dependent transcription of cytokines in macrophages by ground natural silica particles at low sublethal doses. Particle size, size distribution, surface area, and structure were determined using electron microscopy, nitrogen adsorption, and X-ray diffraction. Iron impurity concentrations before and after acid treatment were determined by energy-dispersive X-ray and inductively coupled plasma mass spectroscopy. At a low noncytotoxic dose (1 μg/ml) of 2-μm silica, the presence of iron significantly increased superoxide (O(2)(•-)), lipid peroxidation, lipid raft disruption, and cytokine production in macrophages. The iron chelators deferoxamine mesylate and diethylenetriaminepentaacetic acid were found to abrogate O(2)(•-) production and inhibit lipid peroxidation, raft disruption, and cytokine induction. Tricyclodecan-9-yl xanthate, a competitive inhibitor of phosphatidylcholine-specific phospholipase C (PC-PLC), which is an upstream participant in NF-κB activation, and manganese(III) tetrakis(N-ethylpyridinium-2-yl) porphyrin, a superoxide dismutase and catalase mimic, blocked silica-stimulated cytokine production. We propose a pathway of iron-induced lipid peroxidation disrupting lipid rafts and signaling for the production of cytokines through PC-PLC in silica-exposed macrophages.
Collapse
|
27
|
Roles of the ERK, JNK/AP-1/cyclin D1–CDK4 pathway in silica-induced cell cycle changes in human embryo lung fibroblast cells. Cell Biol Int 2011; 35:697-704. [DOI: 10.1042/cbi20100298] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
28
|
D609 Inhibits Progression of Preexisting Atheroma and Promotes Lesion Stability in Apolipoprotein E
−/−
Mice. Arterioscler Thromb Vasc Biol 2010; 30:411-8. [DOI: 10.1161/atvbaha.109.195768] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Objective—
Atherosclerosis is considered to be a chronic inflammatory disease. Previous research has demonstrated that phosphatidylcholine-specific phospholipase C (PC-PLC) plays critical roles in various inflammatory responses. However, the association between PC-PLC and atherosclerosis is undetermined. Therefore, we sought to investigate whether PC-PLC was implicated in atherosclerosis.
Methods and Results—
Immunofluorescence analysis revealed an upregulation of PC-PLC in the aortic endothelium from apolipoprotein E-deficient (apoE
−/−
) mice. PC-PLC level and activity were also increased in human umbilical vein endothelial cells in response to oxidized low-density lipoprotein treatment. Pharmacological blockade of PC-PLC by D609 inhibited the progression of preexisting atherosclerotic lesions in apoE
−/−
mice and changed the lesion composition into a more stable phenotype. Using a combination of pharmacological inhibition, polyclonal antibodies, confocal laser scanning microscopy and Western blotting, we demonstrated that PC-PLC was required for endothelial expression of lectin-like oxidized low-density lipoprotein receptor-1. In addition, D609 treatment significantly decreased the aortic endothelial expression of the vascular cell adhesion molecule-1 and the intercellular adhesion molecule-1. Furthermore, inhibition of PC-PLC in human umbilical vein endothelial cells reduced the oxidized low-density lipoprotein induced expression of vascular cell adhesion molecule-1, intercellular adhesion molecule-1, and monocyte chemotactic protein-1.
Conclusion—
Our data suggest that PC-PLC contributes to the progression of atherosclerosis.
Collapse
|
29
|
Sun C, Wang N, Huang J, Xin J, Peng F, Ren Y, Zhang S, Miao J. Inhibition of phosphatidylcholine-specific phospholipase C prevents bone marrow stromal cell senescence in vitro. J Cell Biochem 2009; 108:519-28. [PMID: 19626662 DOI: 10.1002/jcb.22282] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Bone marrow stromal cells (BMSCs) can proliferate in vitro and can be transplanted for treating many kinds of diseases. However, BMSCs become senescent with long-term culture, which inhibits their application. To understand the mechanism underlying the senescence, we investigated the activity of phosphatidylcholine-specific phospholipase C (PC-PLC) and levels of integrin beta4, caveolin-1 and ROS with BMSC senescence. The activity of PC-PLC and levels of integrin beta4, caveolin-1 and ROS increased greatly during cell senescence. Selective inhibition of increased PC-PLC activity with D609 significantly decreased the number of senescence-associated beta galactosidase positive cells in BMSCs. Furthermore, D609 restored proliferation of BMSCs and their differentiation into adipocytes. Moreover, D609 suppressed the elevated levels of integrin beta4, caveolin-1 and ROS. The data suggest that PC-PLC is involved in senescence of BMSCs, and its function is associated with integrin beta4, caveolin-1 and ROS.
Collapse
Affiliation(s)
- Chunhui Sun
- Institute of Developmental Biology, School of Life Science, Shandong University, Jinan 250100, China
| | | | | | | | | | | | | | | |
Collapse
|
30
|
Lee HL, Kim YS, Park JH, Chung WY, Lee KS, Oh YJ, Sheen SS, Park KJ, Hwang SC. Selectively decreased expression of peroxiredoxins induced by silica in pulmonary epithelial cells. Korean J Intern Med 2009; 24:220-6. [PMID: 19721858 PMCID: PMC2732781 DOI: 10.3904/kjim.2009.24.3.220] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Accepted: 11/28/2008] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND/AIMS Peroxiredoxin (Prx) belongs to a ubiquitous family of antioxidant enzymes that regulates many cellular processes through intracellular oxidative signal transduction pathways. Silica-induced lung damage involves reactive oxygen species (ROS) that trigger subsequent toxic effects and inflammatory responses in alveolar epithelial cells resulting in fibrosis. Therefore, we investigated the role of Prx in the development of lung oxidant injury caused by silicosis, and determined the implication of ROS in that process. METHODS Lung epithelial cell lines A549 and WI26 were treated with 1% silica for 0, 24, or 48 hours, following pretreatment of the A549 cells with N-acetyl-L-cysteine and diphenylene iodonium and no pretreatment of the WI26 cells. We transfected an HA-ubiquitin construct into the A549 cell line and then analyzed the cells via Western blotting and co-immunoprecipitation. RESULTS Silica treatment induced cell death in the A549 lung epithelial cell line and selectively degraded Prx I without impairing protein synthesis in the A549 cells, even when the ROS effect was blocked chemically by N-acetyl-L-cysteine. A co-immunoprecipitation study revealed that Prx I did not undergo ubiquitination. CONCLUSIONS Silica treatment induces a decrease of Prx I expression in lung epithelial cell lines regardless of the presence of ROS. The silica-induced degradation of Prx does not involve the ubiquitin-proteasomal pathway.
Collapse
Affiliation(s)
- Hye Lim Lee
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Young Sun Kim
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Joo Hun Park
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Wou Young Chung
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Kyu Sung Lee
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Yoon Jung Oh
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Seung Soo Sheen
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Kwang Joo Park
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| | - Sung Chul Hwang
- Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Korea
| |
Collapse
|
31
|
Ji WJ, Zhou X, Zeng S, Wang SX. ATTENUATION OF SILICA-INDUCED PULMONARY FIBROBLASTS PROLIFERATION BY TAURINE AND NIACIN IN VITRO. Exp Lung Res 2009; 35:198-209. [DOI: 10.1080/01902140802499401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
32
|
Staiano RI, Granata F, Secondo A, Petraroli A, Loffredo S, Frattini A, Annunziato L, Marone G, Triggiani M. Expression and function of Na+/Ca2+ exchangers 1 and 3 in human macrophages and monocytes. Eur J Immunol 2009; 39:1405-18. [DOI: 10.1002/eji.200838792] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
33
|
Sato T, Shimosato T, Alvord WG, Klinman DM. Suppressive oligodeoxynucleotides inhibit silica-induced pulmonary inflammation. THE JOURNAL OF IMMUNOLOGY 2008; 180:7648-54. [PMID: 18490767 DOI: 10.4049/jimmunol.180.11.7648] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Inhalation of silica-containing dust particles induces silicosis, an inflammatory disease of the lungs characterized by the infiltration of macrophages and neutrophils into the lungs and the production of proinflammatory cytokines, chemokines, and reactive oxygen species (ROS). Synthetic oligodeoxynucleotides (ODN) expressing "immunosuppressive motifs" were recently shown to block pathologic inflammatory reactions in murine models of autoimmune disease. Based on those findings, the potential of suppressive ODN to prevent acute murine silicosis was examined. In vitro studies indicate that suppressive ODN blunt silica-induced macrophage toxicity. This effect was associated with a reduction in ROS production and p47phox expression (a subunit of NADPH oxidase key to ROS generation). In vivo studies show that pretreatment with suppressive (but not control) ODN reduces silica-dependent pulmonary inflammation, as manifest by fewer infiltrating cells, less cytokine/chemokine production, and lower levels of ROS (p < 0.01 for all parameters). Treatment with suppressive ODN also reduced disease severity and improved the survival (p < 0.05) of mice exposed to silica.
Collapse
Affiliation(s)
- Takashi Sato
- Laboratory of Experimental Immunology, National Cancer Institute, Frederick, MD 21702, USA
| | | | | | | |
Collapse
|
34
|
Hasegawa T, Iijima K, Hirota K, Nakajima T, Makino K, Terada H. Exact determination of phagocytic activity of alveolar macrophages toward polymer microspheres by elimination of those attached to the macrophage membrane. Colloids Surf B Biointerfaces 2008; 63:209-16. [DOI: 10.1016/j.colsurfb.2007.12.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Revised: 11/29/2007] [Accepted: 12/01/2007] [Indexed: 10/22/2022]
|
35
|
Hamilton RF, Thakur SA, Holian A. Silica binding and toxicity in alveolar macrophages. Free Radic Biol Med 2008; 44:1246-58. [PMID: 18226603 PMCID: PMC2680955 DOI: 10.1016/j.freeradbiomed.2007.12.027] [Citation(s) in RCA: 255] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2007] [Revised: 10/22/2007] [Accepted: 12/15/2007] [Indexed: 11/22/2022]
Abstract
Inhalation of the crystalline form of silica is associated with a variety of pathologies, from acute lung inflammation to silicosis, in addition to autoimmune disorders and cancer. Basic science investigators looking at the mechanisms involved with the earliest initiators of disease are focused on how the alveolar macrophage interacts with the inhaled silica particle and the consequences of silica-induced toxicity on the cellular level. Based on experimental results, several rationales have been developed for exactly how crystalline silica particles are toxic to the macrophage cell that is functionally responsible for clearance of the foreign particle. For example, silica is capable of producing reactive oxygen species (ROS) either directly (on the particle surface) or indirectly (produced by the cell as a response to silica), triggering cell-signaling pathways initiating cytokine release and apoptosis. With murine macrophages, reactive nitrogen species are produced in the initial respiratory burst in addition to ROS. An alternative explanation for silica toxicity includes lysosomal permeability, by which silica disrupts the normal internalization process leading to cytokine release and cell death. Still other research has focused on the cell surface receptors (collectively known as scavenger receptors) involved in silica binding and internalization. The silica-induced cytokine release and apoptosis are described as the function of receptor-mediated signaling rather than free radical damage. Current research ideas on silica toxicity and binding in the alveolar macrophage are reviewed and discussed.
Collapse
Affiliation(s)
- Raymond F Hamilton
- Department of Biomedical and Pharmaceutical Sciences, Center for Environmental Health Sciences, University of Montana, 32 Campus Drive, SB 154, Missoula, MT 59812, USA
| | | | | |
Collapse
|
36
|
Abstract
Interstitial lung disease encompasses a large group of chronic lung disorders associated with excessive tissue remodeling, scarring, and fibrosis. The evidence of a redox imbalance in lung fibrosis is substantial, and the rationale for testing antioxidants as potential new therapeutics for lung fibrosis is appealing. Current animal models of lung fibrosis have clear involvement of ROS in their pathogenesis. New classes of antioxidant agents divided into catalytic antioxidant mimetics and antioxidant scavengers are being developed. The catalytic antioxidant class is based on endogenous antioxidant enzymes and includes the manganese-containing macrocyclics, porphyrins, salens, and the non-metal-containing nitroxides. The antioxidant scavenging class is based on endogenous antioxidant molecules and includes the vitamin E analogues, thiols, lazaroids, and polyphenolic agents. Numerous studies have shown oxidative stress to be associated with many interstitial lung diseases and that these agents are effective in attenuating fibroproliferative responses in the lung of animals and humans.
Collapse
Affiliation(s)
- Brian J Day
- Division of Environmental and Occupational Health Sciences, Department of Medicine, National Jewish Medical and Research Center, Denver, Colorado 80206, USA.
| |
Collapse
|
37
|
Hasegawa T, Hirota K, Tomoda K, Ito F, Inagawa H, Kochi C, Soma GI, Makino K, Terada H. Phagocytic activity of alveolar macrophages toward polystyrene latex microspheres and PLGA microspheres loaded with anti-tuberculosis agent. Colloids Surf B Biointerfaces 2007; 60:221-8. [PMID: 17683920 DOI: 10.1016/j.colsurfb.2007.06.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Revised: 06/11/2007] [Accepted: 06/17/2007] [Indexed: 11/19/2022]
Abstract
Phagocytosis of alveolar macrophages (Mphis) toward poly(lactic-co-glycolic acid) (PLGA) microspheres (MS) loaded with the anti-tuberculosis agent rifampicin (RFP-PLGA MS) has been shown to be effective for the treatment of tuberculosis. The phagocytosis should be evaluated in terms of that toward reference MS. We chose polystyrene latex (PSL) MS as a reference. In this study, phagocytic activity of cell line NR8383, derived from rat alveolar Mphi, toward PSL MS with various diameters was examined by incubating the cells for 4h at 37 degrees C with various numbers of PSL MS per Mphi cell (MS/Mphi=0.1-10). The results were then compared with those of the phagocytosis toward RFP-PLGA MS. We determined the phagocytic activity by counting the population of Mphi cells that had phagocytosed MS (N) and the number of particles phagocytosed (n) in microscopic fields. Both N and n for PSL and RFP-PLGA MS increased in general with an increase in MS/Mphi, but both of these values for PSL MS were smaller than those for RFP-PLGA MS. Phagocytosis of the particles were dependent on the particle size; i.e., of the PSL MS the 6-mum ones were taken up by Mphi the most, and the RFP-PLGA MS 3 microm in diameter seemed to be phagocytosed the most efficiently, although we were not able to determine exactly the phagocytosis of 6- and 10-microm RFP-PLGA MS. From the changes in N and n values with MS/Mphi, the phagocytosis of RFP-PLGA MS was likely to enhance the phagocytic activity of Mphi cells, but this effect did not seem to be significant for PSL MS.
Collapse
Affiliation(s)
- Taizo Hasegawa
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|