1
|
Meenakshi S, Bahekar T, Narapaka PK, Pal B, Prakash V, Dhingra S, Kumar N, Murti K. Impact of fluorosis on molecular predictors in pathogenesis of type 2 diabetes associated microvascular complications. J Trace Elem Med Biol 2024; 86:127506. [PMID: 39128255 DOI: 10.1016/j.jtemb.2024.127506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 07/23/2024] [Accepted: 07/29/2024] [Indexed: 08/13/2024]
Abstract
AIM This review presents specific insights on the molecular underpinnings of the connection between fluorosis, type 2 diabetes, and microvascular complications, along with the novel biomarkers that are available for early detection. SUMMARY Fluoride is an essential trace element for the mineralization of teeth and bones in humans. Exposure to higher concentrations of fluoride has harmful effects that significantly outweigh its advantageous ones. Dental fluorosis and skeletal fluorosis are the common side effects of exposure to fluoride, which affect millions of individuals globally. Alongside, it also causes non-skeletal fluorosis, which affects the population suffering from non-communicable diseases like diabetes by impacting the soft tissues and causing diabetic microvascular complications. Previous studies reported the prevalence range of these diabetic complications of neuropathy (3-65 %), nephropathy (1-63 %), and retinopathy (2-33 %). Fluoride contributes to the development of these complications by causing oxidative stress, cellular damage, degrading the functioning capability of mitochondria, and thickening the retinal vein basement. CONCLUSION Early diagnosis is a prompt way of prevention, and for that, biomarkers have emerged as an innovative and useful technique. This allows healthcare practitioners and policymakers in endemic areas to comprehend the molecular complexities involved in the advancement of diabetic microvascular problems in the context of high fluoride exposure.
Collapse
Affiliation(s)
- Sarasa Meenakshi
- Department of Pharmacy Practice, National Institute of Pharmaceutical Education and Research, Hajipur, Vaishali, Bihar 844102, India.
| | - Triveni Bahekar
- Department of Pharmacy Practice, National Institute of Pharmaceutical Education and Research, Hajipur, Vaishali, Bihar 844102, India.
| | - Pavan Kumar Narapaka
- Department of Pharmacy Practice, National Institute of Pharmaceutical Education and Research, Hajipur, Vaishali, Bihar 844102, India.
| | - Biplab Pal
- Department of Pharmacology, Lovely Professional University, Phagwara, Punjab 144402 India.
| | - Ved Prakash
- Department of Endocrinology, Indira Gandhi institute of medical sciences (IGIMS), Bailey Road, Sheikhpura, Patna, Bihar 800014, India.
| | - Sameer Dhingra
- Department of Pharmacy Practice, National Institute of Pharmaceutical Education and Research, Hajipur, Vaishali, Bihar 844102, India.
| | - Nitesh Kumar
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Hajipur, Vaishali, Bihar 844102, India.
| | - Krishna Murti
- Department of Pharmacy Practice, National Institute of Pharmaceutical Education and Research, Hajipur, Vaishali, Bihar 844102, India.
| |
Collapse
|
2
|
Babu S, Manoharan S, Ottappilakkil H, Perumal E. Role of oxidative stress-mediated cell death and signaling pathways in experimental fluorosis. Chem Biol Interact 2022; 365:110106. [PMID: 35985521 DOI: 10.1016/j.cbi.2022.110106] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 08/06/2022] [Accepted: 08/08/2022] [Indexed: 11/03/2022]
Abstract
Free radicals and other oxidants have enticed the interest of researchers in the fields of biology and medicine, owing to their role in several pathophysiological conditions, including fluorosis (Fluoride toxicity). Radical species affect cellular biomolecules such as nucleic acids, proteins, and lipids, resulting in oxidative stress. Reactive oxygen species-mediated oxidative stress is a common denominator in fluoride toxicity. Fluorosis is a global health concern caused by excessive fluoride consumption over time. Fluoride alters the cellular redox homeostasis, and its toxicity leads to the activation of cell death mechanisms like apoptosis, autophagy, and necroptosis. Even though a surfeit of signaling pathways is involved in fluorosis, their toxicity mechanisms are not fully understood. Thus, this review aims to understand the role of reactive species in fluoride toxicity with an outlook on the effects of fluoride in vitro and in vivo models. Also, we emphasized the signal transduction pathways and the mechanism of cell death implicated in fluoride-induced oxidative stress.
Collapse
Affiliation(s)
- Srija Babu
- Molecular Toxicology Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore, 641046, Tamil Nadu, India
| | - Suryaa Manoharan
- Molecular Toxicology Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore, 641046, Tamil Nadu, India
| | - Harsheema Ottappilakkil
- Molecular Toxicology Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore, 641046, Tamil Nadu, India
| | - Ekambaram Perumal
- Molecular Toxicology Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore, 641046, Tamil Nadu, India.
| |
Collapse
|
3
|
Cellular signalling pathways mediating the pathogenesis of chronic inflammatory respiratory diseases: an update. Inflammopharmacology 2020; 28:795-817. [PMID: 32189104 DOI: 10.1007/s10787-020-00698-3] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 03/02/2020] [Indexed: 02/06/2023]
|
4
|
Influence of Acetylcholinesterase Inhibitors Used in Alzheimer's Disease Treatment on the Activity of Antioxidant Enzymes and the Concentration of Glutathione in THP-1 Macrophages under Fluoride-Induced Oxidative Stress. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 16:ijerph16010010. [PMID: 30577562 PMCID: PMC6339019 DOI: 10.3390/ijerph16010010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 12/09/2018] [Accepted: 12/17/2018] [Indexed: 01/03/2023]
Abstract
It has been reported that donepezil and rivastigmine, the acetylcholinesterase (AchE) inhibitors commonly used in the treatment of Alzheimer’s disease (AD), do not only inhibit AChE but also have antioxidant properties. As oxidative stress is involved in AD pathogenesis, in our study we attempted to examine the influence of donepezil and rivastigmine on the activity of antioxidant enzymes and glutathione concentration in macrophages—an important source of reactive oxygen species and crucial for oxidative stress progression. The macrophages were exposed to sodium fluoride induced oxidative stress. The antioxidant enzymes activity and concentration of glutathione were measured spectrophotometrically. The generation of reactive oxygen species was visualized by confocal microscopy. The results of our study showed that donepezil and rivastigmine had a stimulating effect on catalase activity. However, when exposed to fluoride-induced oxidative stress, the drugs reduced the activity of some antioxidant enzymes (Cat, SOD, GR). These observations suggest that the fluoride-induced oxidative stress may suppress the antioxidant action of AChE inhibitors. Our results may have significance in the clinical practice of treatment of AD and other dementia diseases.
Collapse
|
5
|
Lu CH, Lin CH, Li KJ, Shen CY, Wu CH, Kuo YM, Lin TS, Yu CL, Hsieh SC. Intermediate Molecular Mass Hyaluronan and CD44 Receptor Interactions Enhance Neutrophil Phagocytosis and IL-8 Production via p38- and ERK1/2-MAPK Signalling Pathways. Inflammation 2018; 40:1782-1793. [PMID: 28730511 DOI: 10.1007/s10753-017-0622-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
CD44 is a common leukocyte adhesion molecule expressed on the surface of various cells. Hyaluronan (HA), the natural ligand of CD44, is a simple repeated disaccharide with variable molecular mass that is widely distributed on cell surfaces and the connective tissue matrix. The binding of small molecular mass HA (SMM-HA, MW < 80 kDa) to CD44 on immune-related cells elicits cell proliferation, differentiation, and cytokine production. However, the effects and molecular basis of intermediate molecular mass HA (IMM-HA, MW ≈ 500 kDa)-CD44 interactions on polymorphonuclear neutrophil (PMN) functions have not been elucidated. We hypothesised that IMM-HA would potentiate immune functions as well as SMM-HA. In the present study, we demonstrated IMM-HA and CD44 interactions enhanced normal PMN phagocytosis and IL-8 production compared to those with LPS or anti-CD45 treatment via F-actin cytoskeleton polymerization and subsequent ERK1/2- and p38-MAPK phosphorylation. Antibody-based inhibition of CD44 did not affect PMN function; however, F-actin aggregation was induced without MAPK phosphorylation. Enhanced PMN function via IMM-HA was determined to be CD44-dependent since this effect was abolished in DMSO-induced CD44(-) PMN-like cells obtained from HL-60 cells. In conclusion, we demonstrated that IMM-HA and CD44 interactions on PMNs potently elicit F-actin cytoskeleton polymerization and p38- and ERK1/2-MAPK phosphorylation to enhance PMN function.
Collapse
Affiliation(s)
- Cheng-Hsun Lu
- Institute of Clinical Medicine, National Taiwan University College of Medicine, No. 7 Chung-San South Road, Taipei, 10002, Taiwan.,Department of Internal Medicine, National Taiwan University Hospital-Yunlin Branch, No. 95 Xuefu Rd, Huwei Township, Yunlin County, 632, Taiwan
| | - Chia-Huei Lin
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, No. 7, Chung-San South Road, Taipei, 10002, Taiwan
| | - Ko-Jen Li
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, No. 7, Chung-San South Road, Taipei, 10002, Taiwan
| | - Chieh-Yu Shen
- Institute of Clinical Medicine, National Taiwan University College of Medicine, No. 7 Chung-San South Road, Taipei, 10002, Taiwan.,Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, No. 7, Chung-San South Road, Taipei, 10002, Taiwan
| | - Cheng-Han Wu
- Institute of Clinical Medicine, National Taiwan University College of Medicine, No. 7 Chung-San South Road, Taipei, 10002, Taiwan.,Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, No. 7, Chung-San South Road, Taipei, 10002, Taiwan
| | - Yu-Min Kuo
- Institute of Clinical Medicine, National Taiwan University College of Medicine, No. 7 Chung-San South Road, Taipei, 10002, Taiwan.,Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, No. 7, Chung-San South Road, Taipei, 10002, Taiwan
| | - Ting-Syuan Lin
- Department of Internal Medicine, National Taiwan University Hospital-Yunlin Branch, No. 95 Xuefu Rd, Huwei Township, Yunlin County, 632, Taiwan
| | - Chia-Li Yu
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, No. 7, Chung-San South Road, Taipei, 10002, Taiwan.,Institute of Molecular Medicine, National Taiwan University College of Medicine, No. 7 Chung-San South Road, Taipei, 10002, Taiwan
| | - Song-Chou Hsieh
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, No. 7, Chung-San South Road, Taipei, 10002, Taiwan.
| |
Collapse
|
6
|
Goschorska M, Baranowska-Bosiacka I, Gutowska I, Tarnowski M, Piotrowska K, Metryka E, Safranow K, Chlubek D. Effect of acetylcholinesterase inhibitors donepezil and rivastigmine on the activity and expression of cyclooxygenases in a model of the inflammatory action of fluoride on macrophages obtained from THP-1 monocytes. Toxicology 2018; 406-407:9-20. [PMID: 29777723 DOI: 10.1016/j.tox.2018.05.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/09/2018] [Accepted: 05/11/2018] [Indexed: 12/31/2022]
Abstract
Inflammation is an important factor in the development of many diseases of the central nervous system, including Alzheimer's disease and other types of dementia. Given that acetylcholinesterase inhibitors are also currently believed to have anti-inflammatory properties, the purpose of this study was to investigate the effect of acetylcholinesterase inhibitors (rivastigmine, donepezil) on cyclooxygenase activity and expression using the proinflammatory action of fluoride (F-) on cultured macrophages obtained from THP-1 monocytes. COX-1 and COX-2 activity was determined through measurement of the products of prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) in cell culture supernatants. Expression of COX-1 and COX-2 proteins was examined immunocytochemically, and mRNA expression was determined by qRT PCR. Our study confirmed the inhibitory effects of donepezil and rivastigmine on the production of PGE2, TXB2, COX-1 and COX-2 mRNA and protein expression in macrophages. We also demonstrated that the pro-inflammatory effect of fluoride may be reduced by the use of both drugs. The additive effect of these drugs cannot be ruled out, and effects other than those observed in the use of one drug should also be taken into account.
Collapse
Affiliation(s)
- Marta Goschorska
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 72, Szczecin 70-111, Poland.
| | - Irena Baranowska-Bosiacka
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 72, Szczecin 70-111, Poland.
| | - Izabela Gutowska
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24, Szczecin 71-460, Poland.
| | - Maciej Tarnowski
- Department of Physiology, Pomeranian Medical University, Powstańców Wlkp. 72, Szczecin 70-111, Poland.
| | - Katarzyna Piotrowska
- Department of Physiology, Pomeranian Medical University, Powstańców Wlkp. 72, Szczecin 70-111, Poland.
| | - Emilia Metryka
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 72, Szczecin 70-111, Poland.
| | - Krzysztof Safranow
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 72, Szczecin 70-111, Poland.
| | - Dariusz Chlubek
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 72, Szczecin 70-111, Poland.
| |
Collapse
|
7
|
Låg M, Skuland T, Godymchuk A, Nguyen THT, Pham HLT, Refsnes M. Silica Nanoparticle-induced Cytokine Responses in BEAS-2B and HBEC3-KT Cells: Significance of Particle Size and Signalling Pathways in Different Lung Cell Cultures. Basic Clin Pharmacol Toxicol 2018; 122:620-632. [PMID: 29334172 DOI: 10.1111/bcpt.12963] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 01/04/2018] [Indexed: 12/16/2022]
Abstract
We have previously reported that silica nanoparticles (SiNPs) of nominal size 50 nm (Si50) induce the pro-inflammatory cytokines CXCL8 and IL-6 in BEAS-2B cells, via mechanisms involving MAPK p38, TACE-mediated TGF-α release and the NF-κB pathway. In this study, we examined whether these findings are cell specific or might be extended to another epithelial lung cell model, HBEC3-KT, and also to SiNPs of a smaller size (nominal size of 10 nm; Si10). The TEM average size of Si10 and Si50 was 10.9 and 34.7 nm, respectively. The surface area (BET) of Si10 was three times higher than for Si50 per mass unit. With respect to hydrodynamic size (DLS), Si10 in exposure medium showed a higher z-average for the main peak than Si50, indicating more excessive agglomeration. Si10 strongly induced CXCL8 and IL-6, as assessed by ELISA and RT-PCR, and was markedly more potent than Si50, even when adjusted to equal surface area. Furthermore, Si10 was far more cytotoxic, measured as lactate dehydrogenase (LDH) release, than Si50 in both epithelial cell cultures. With respect to signalling pathways, Western analysis and experiments with and without inhibition of MAPK, TACE and NF-κB (synthetic inhibitors) revealed that p38-phosphorylation, TACE-mediated TGF-α release and NF-κB activation seem to be important triggering mechanisms for both Si50 and Si10 in the two different lung epithelial cell cultures. In conclusion, the identified signalling pathways are suggested to be important in inducing cytokine responses in different epithelial cell types and also for various sizes of silica nanoparticles.
Collapse
Affiliation(s)
- Marit Låg
- Department of Air Pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway.,Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Norway
| | - Tonje Skuland
- Department of Air Pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway
| | - Anna Godymchuk
- Department of Nanomaterials and Nanotechnologies, Tomsk Polytechnic University, Tomsk, Russia.,Department of Functional Nanosystems and High-temperature Materials, National University of Science and Technology 'MISIS', Moscow, Russia
| | - Thu H T Nguyen
- Department of Air Pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway.,Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Norway
| | - Hang L T Pham
- Department of Air Pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway.,Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Norway
| | - Magne Refsnes
- Department of Air Pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway
| |
Collapse
|
8
|
Ameeramja J, Perumal E. Pulmonary fluorosis: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:22119-22132. [PMID: 28840484 DOI: 10.1007/s11356-017-9951-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 08/11/2017] [Indexed: 06/07/2023]
Abstract
The increased industrialization and improvised human lifestyle lead to a surge in environmental pollution nowadays. Even the chemicals which are known as prophylactic agents were currently liable to be toxic. One among them is inorganic fluoride whose wider application in numerous processes makes it as an inevitable environmental contaminant and industrial pollutant. Although the systemic toxicity of fluoride has been extensively studied, still there is lacuna in the field of pulmonary fluoride toxicity. Hence, we have focused on the molecular mechanism of action of fluoride compounds on pulmonary system. A study of literatures that focused on the potential physiological and toxicological consequences of fluoride on pulmonary system was carried out. The goal of this review is to present an overview of the research carried out till date on the molecular aspects of fluoride exposure with emphasis on pulmonary system and their possible mechanisms.
Collapse
Affiliation(s)
- Jaishabanu Ameeramja
- Molecular Toxicology Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore, 640 046, India
| | - Ekambaram Perumal
- Molecular Toxicology Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore, 640 046, India.
| |
Collapse
|
9
|
Gutowska I, Baranowska-Bosiacka I, Goschorska M, Kolasa A, Łukomska A, Jakubczyk K, Dec K, Chlubek D. Fluoride as a factor initiating and potentiating inflammation in THP1 differentiated monocytes/macrophages. Toxicol In Vitro 2015; 29:1661-8. [PMID: 26119525 DOI: 10.1016/j.tiv.2015.06.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 06/23/2015] [Accepted: 06/25/2015] [Indexed: 02/08/2023]
Abstract
It is well known that exposure to fluorides lead to an increased ROS production and enhances the inflammatory reactions. Therefore we decided to examine whether cyclooxygenases (particular COX-2) activity and expression may be changed by fluoride in THP1 macrophages and in this way may change the prostanoids biosynthesis. In the present work we demonstrate that fluoride increased concentration of PGE2 and TXA2 in THP1 macrophages. Following exposure to 1-10 μM NaF, COX-2 protein and COX-2 transcript increased markedly. COX-2 protein up-regulation probably is mediated by ROS, produced during fluoride-induced inflammatory reactions. Additional fluoride activates the transcription factor, nuclear factor (NF)-kappaB, which is involved in the up-regulation of COX-2 gene expression. This study indicated that even in small concentrations fluoride changes the amounts and activity of COX-1 and COX-2 enzymes taking part in the initiating and development of inflammatory process.
Collapse
Affiliation(s)
- I Gutowska
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24 Str., Szczecin, Poland
| | - I Baranowska-Bosiacka
- Department of Biochemistry, Pomeranian Medical University, Powstańców Wlkp 72 Str., Szczecin, Poland.
| | - M Goschorska
- Department of Biochemistry, Pomeranian Medical University, Powstańców Wlkp 72 Str., Szczecin, Poland
| | - A Kolasa
- Department of Histology and Embryology, Pomeranian Medical University, Powstańców Wlkp 72 Str., Szczecin, Poland
| | - A Łukomska
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24 Str., Szczecin, Poland
| | - K Jakubczyk
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24 Str., Szczecin, Poland
| | - K Dec
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24 Str., Szczecin, Poland
| | - D Chlubek
- Department of Biochemistry, Pomeranian Medical University, Powstańców Wlkp 72 Str., Szczecin, Poland
| |
Collapse
|
10
|
Refsnes M, Skuland T, Låg M, Schwarze PE, Øvrevik J. Differential NF-κB and MAPK activation underlies fluoride- and TPA-mediated CXCL8 (IL-8) induction in lung epithelial cells. J Inflamm Res 2014; 7:169-85. [PMID: 25540590 PMCID: PMC4270361 DOI: 10.2147/jir.s69646] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Different toxic agents have a varying potential to induce the production of the proinflammatory chemokine, CXCL8 (interleukin [IL]-8), in lung cells. A critical question is which mechanisms determine the magnitude and persistence of the CXCL8 responses to different stimuli. To approach this, we compared the potential of the phorbol ester, 12-O-tetradecanoylphorbol-13-acetate (TPA), and sodium fluoride (NaF) to induce CXCL8 responses in A549 cells, with emphasis on the importance of nuclear factor kappa B (NF-κB)- and mitogen-activated protein kinase (MAPK) signaling. Notably, TPA induced a greater release of CXCL8 than did NaF. Furthermore, TPA induced a strong, rapid, but transient upregulation of CXCL8 messenger (m)RNA, whereas NaF induced a weaker, more delayed, but persistent upregulation. With respect to signaling, TPA led to an early, strong, and relatively transient extracellular signal-regulated kinase (ERK)1/2 phosphorylation, and a less marked and even more transient phosphorylation of c-jun-N-terminal kinases (JNK1/2) and p38. In contrast, NaF elicited a lower, but relatively sustained increase in phosphorylation of ERK1/2, and a marked phosphorylation of p38 and JNK1/2, with the JNK1/2 response as most transient. Only ERK1/2 inhibition affected the TPA response, whereas inhibition of all the three MAPK cascades reduced NaF-induced CXCL8 release. TPA also induced an early, marked phosphorylation/translocation of p65 (NF-κB), whereas NaF induced slower, less pronounced effects on p65. The CXCL8 responses by TPA and NaF were reduced by p65-siRNA. In conclusion, all MAPK cascades were involved in NaF-induced CXCL8 release, whereas only ERK1/2 activation was involved in response to TPA. Furthermore, NF-κB activation appeared to be indispensable for CXCL8 induction. The early response, magnitude, and persistency of MAPK and NF-κB signaling seemed to be critical determinants for the potential to induce CXCL8. These findings underscore that a strong, rapid, and relatively transient activation of ERK1/2 in combination with NF-kB may be sufficient for a strong induction of CXCL8, which may exceed the effects of a more moderate ERK1/2 activation in combination with activation of p38, JNK1/2, and NF-κB.
Collapse
Affiliation(s)
- Magne Refsnes
- Department of Air Pollution and Noise, Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| | - Tonje Skuland
- Department of Air Pollution and Noise, Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| | - Marit Låg
- Department of Air Pollution and Noise, Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| | - Per E Schwarze
- Department of Air Pollution and Noise, Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| | - Johan Øvrevik
- Department of Air Pollution and Noise, Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| |
Collapse
|
11
|
Skuland T, Øvrevik J, Låg M, Schwarze P, Refsnes M. Silica nanoparticles induce cytokine responses in lung epithelial cells through activation of a p38/TACE/TGF-α/EGFR-pathway and NF-κΒ signalling. Toxicol Appl Pharmacol 2014; 279:76-86. [DOI: 10.1016/j.taap.2014.05.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 05/11/2014] [Accepted: 05/12/2014] [Indexed: 11/25/2022]
|
12
|
Suzuki M, Bartlett JD. Sirtuin1 and autophagy protect cells from fluoride-induced cell stress. Biochim Biophys Acta Mol Basis Dis 2013; 1842:245-55. [PMID: 24296261 DOI: 10.1016/j.bbadis.2013.11.023] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 11/12/2013] [Accepted: 11/25/2013] [Indexed: 12/11/2022]
Abstract
Sirtuin1 (SIRT1) is a nicotinamide adenine dinucleotide (NAD(+))-dependent deacetylase functioning in the regulation of metabolism, cell survival and organismal lifespan. Active SIRT1 regulates autophagy during cell stress, including calorie restriction, endoplasmic reticulum (ER) stress and oxidative stress. Previously, we reported that fluoride induces ER-stress in ameloblasts responsible for enamel formation, suggesting that ER-stress plays a role in dental fluorosis. However, the molecular mechanism of how cells respond to fluoride-induced cell stress is unclear. Here, we demonstrate that fluoride activates SIRT1 and initiates autophagy to protect cells from fluoride exposure. Fluoride treatment of ameloblast-derived cells (LS8) significantly increased Sirt1 expression and induced SIRT1 phosphorylation resulting in the augmentation of SIRT1 deacetylase activity. To demonstrate that fluoride exposure initiates autophagy, we characterized the expression of autophagy related genes (Atg); Atg5, Atg7 and Atg8/LC3 and showed that both their transcript and protein levels were significantly increased following fluoride treatment. To confirm that SIRT1 plays a protective role in fluoride toxicity, we used resveratrol (RES) to augment SIRT1 activity in fluoride treated LS8 cells. RES increased autophagy, inhibited apoptosis, and decreased fluoride cytotoxicity. Rats treated with fluoride (0, 50, 100 and 125ppm) in drinking water for 6weeks had significantly elevated expression levels of Sirt1, Atg5, Atg7 and Atg8/LC3 in their maturation stage enamel organs. Increased protein levels of p-SIRT1, ATG5 and ATG8/LC3 were present in fluoride-treated rat maturation stage ameloblasts. Therefore, the SIRT1/autophagy pathway may play a critical role as a protective response to help prevent dental fluorosis.
Collapse
Affiliation(s)
- Maiko Suzuki
- Department of Mineralized Tissue Biology, The Forsyth Institute, 245 First Street, Cambridge, MA 02142, USA; Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA
| | - John D Bartlett
- Department of Mineralized Tissue Biology, The Forsyth Institute, 245 First Street, Cambridge, MA 02142, USA; Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA.
| |
Collapse
|
13
|
JNK and NADPH oxidase involved in fluoride-induced oxidative stress in BV-2 microglia cells. Mediators Inflamm 2013; 2013:895975. [PMID: 24072958 PMCID: PMC3773420 DOI: 10.1155/2013/895975] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 07/08/2013] [Accepted: 07/11/2013] [Indexed: 11/25/2022] Open
Abstract
Excessive fluoride may cause central nervous system (CNS) dysfunction, and oxidative stress is a recognized mode of action of fluoride toxicity. In CNS, activated microglial cells can release more reactive oxygen species (ROS), and NADPH oxidase (NOX) is the major enzyme for the production of extracellular superoxide in microglia. ROS have been characterized as an important secondary messenger and modulator for various mammalian intracellular signaling pathways, including the MAPK pathways. In this study we examined ROS production and TNF-α, IL-1β inflammatory cytokines releasing, and the expression of MAPKs in BV-2 microglia cells treated with fluoride. We found that fluoride increased JNK phosphorylation level of BV-2 cells and pretreatment with JNK inhibitor SP600125 markedly reduced the levels of intracellular O2·− and NO. NOX inhibitor apocynin and iNOS inhibitor SMT dramatically decreased NaF-induced ROS and NO generations, respectively. Antioxidant melatonin (MEL) resulted in a reduction in JNK phosphorylation in fluoride-stimulated BV-2 microglia. The results confirmed that NOX and iNOS played an important role in fluoride inducing oxidative stress and NO production and JNK took part in the oxidative stress induced by fluoride and meanwhile also could be activated by ROS in fluoride-treated BV-2 cells.
Collapse
|
14
|
Chen Q, Wang Z, Xiong Y, Zou X, Liu Z. Comparative study of p38 MAPK signal transduction pathway of peripheral blood mononuclear cells from patients with coal-combustion-type fluorosis with and without high hair selenium levels. Int J Hyg Environ Health 2010; 213:381-6. [DOI: 10.1016/j.ijheh.2010.06.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Revised: 05/24/2010] [Accepted: 06/06/2010] [Indexed: 11/29/2022]
|
15
|
Li X, Hu Y, Jin Z, Jiang H, Wen J. Silica-induced TNF-alpha and TGF-beta1 expression in RAW264.7 cells are dependent on Src-ERK/AP-1 pathways. Toxicol Mech Methods 2010; 19:51-8. [PMID: 19778233 DOI: 10.1080/15376510802354201] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The cytokines secreted by lung macrophages have been shown to play a critical role in the pathogenesis of silicosis, tumor necrosis factor-alpha (TNF-alpha), and transforming growth factor-beta1 (TGF-beta1) are prominent cytokines in silicosis, but the underlying mechanism remains to be determined. The aim of the present study was to investigate the roles of Src-mitogen-activated protein kinase (MAPKs)/activator protein-1 (AP-1) signaling pathways in silica-induced TNF-alpha and TGF-beta1 expression in macrophage cells (RAW264.7). It was found that silica activated Src, p38 kinase, and extracellular signal-regulated kinase (ERK) in RAW264.7 cells. The induction of TNF-alpha and TGF-beta1 by silica was suppressed by Src inhibitor (PP1), ERK inhibitor (PD98059), but not by p38 kinase inhibitor (SB203580). Dominant negative mutant c-Jun (TAM67) inhibited silica-induced AP-1 DNA binding activity and downregulated the TNF-alpha and TGF-beta1 expression. In addition, PD98059 but not SB203580 inhibited the AP-1 DNA binding activity induced by silica. Based on these findings, it was conclude that Src-ERK/AP-1 signaling pathways are involved in the TNF-alpha and TGF-beta1 expression induced by silica in macrophages.
Collapse
Affiliation(s)
- Xiang Li
- Department of Pathology, Xiangya Medical School, Central South University, Changsha 410013, PR China
| | | | | | | | | |
Collapse
|
16
|
Fluoride-induced cyclooxygenase-2 expression and prostaglandin E2 production in A549 human pulmonary epithelial cells. Toxicol Lett 2009; 188:180-5. [DOI: 10.1016/j.toxlet.2009.04.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 04/07/2009] [Accepted: 04/08/2009] [Indexed: 12/16/2022]
|