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Alveolar type 2 progenitor cells for lung injury repair. Cell Death Discov 2019; 5:63. [PMID: 30774991 PMCID: PMC6368612 DOI: 10.1038/s41420-019-0147-9] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Revised: 12/24/2018] [Accepted: 01/02/2019] [Indexed: 12/19/2022] Open
Abstract
Alveolar type 2 progenitor cells (AT2) seem closest to clinical translation, specifying the evidence that AT2 may satisfactorily control the immune response to decrease lung injury by stabilizing host immune-competence and a classic and crucial resource for lung regeneration and repair. AT2 establish potential in benefiting injured lungs. However, significant discrepancies linger in our understanding vis-à-vis the mechanisms for AT2 as a regime for stem cell therapy as well as essential guiding information for clinical trials, including effectiveness in appropriate pre-clinical models, safety, mostly specifications for divergent lung injury patients. These important gaps shall be systematically investigated prior to the vast therapeutic perspective of AT2 cells for pulmonary diseases can be considered. This review focused on AT2 cells homeostasis, pathophysiological changes in the pathogenesis of lung injury, physiological function of AT2 cells, apoptosis of AT2 cells in lung diseases, the role of AT2 cells in repairing processes after lung injury, mechanism of AT2 cells activation promote repairing processes after lung injury, and potential therapy of lung disease by utilizing the AT2 progenitor cells. The advancement remains to causally connect the molecular and cellular alteration of AT2 cells to lung injury and repair. Conclusively, it is identified that AT2 cells can convert into AT1 cells; but, the comprehensive cellular mechanisms involved in this transition are unrevealed. Further investigation is mandatory to determine new strategies to prevent lung injury.
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Kang EK, Kim HS. The effects of hydrogen peroxide and lipopolysaccharide on rat alveolar L2 cells. Exp Lung Res 2017; 43:293-300. [PMID: 29140130 DOI: 10.1080/01902148.2017.1368738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE This study aimed to investigate differential cell responses of alveolar epithelial cells (AECs) after treatments with lipopolysaccharide (LPS) and hydrogen peroxide (H2O2) to mimic the exposure to inflammation and oxidative stress and the mechanisms of a double-hit model of apoptosis. MATERIALS AND METHODS AECs were cultured and treated with combinations of 1 μg/mL of LPS and 500 μM H2O2 as follows: LPS-only at 0 h, LPS at 0 h with H2O2 at 6 h (LPS + H2O2), H2O2-only at 0 h, H2O2 at 0 h with LPS at 6 h (H2O2 + LPS), and control. We investigated mRNA expression (TNF-α, Fas, Fas ligand, Bax, Bcl-2, Caspase-7), protein expression (Fas, Bax, Bcl-2, Caspase-7) and apoptosis (Caspase-3 activity, TUNEL assay) at 0, 3, 6, 9, 12, and 24 h. RESULTS In the H2O2 + LPS group, the Caspase-7, and Fas mRNA levels were significantly higher than the other groups at 9 h and 12 h, and Bax was higher at 12 h. The Bax/Bcl-2 protein expression ratio was significantly higher in the H2O2 + LPS group than that of the other groups at 12h and 24h. Apoptotic index was highest in the H2O2 + LPS group at 24 h. CONCLUSIONS The sequence of stimulation may modify the cell response in rat AECs. The results suggest that previous oxidative stress and subsequent LPS-induced inflammation primarily influence apoptosis of L2 cells by up-regulation of cell signaling.
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Affiliation(s)
- Eun Kyeong Kang
- a Depart of Pediatrics , Dongguk University College of Medicine and Ilsan Hospital , Goyang , Gyung-gi , Republic of Korea.,b Depart of Pediatrics , Seoul National University College of Medicine , Seoul , Republic of Korea
| | - Han Suk Kim
- b Depart of Pediatrics , Seoul National University College of Medicine , Seoul , Republic of Korea
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Topcu-Tarladacalisir Y, Tarladacalisir T, Sapmaz-Metin M, Karamustafaoglu A, Uz YH, Akpolat M, Cerkezkayabekir A, Turan FN. N-Acetylcysteine counteracts oxidative stress and protects alveolar epithelial cells from lung contusion-induced apoptosis in rats with blunt chest trauma. J Mol Histol 2014; 45:463-71. [PMID: 24442604 DOI: 10.1007/s10735-014-9563-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 01/09/2014] [Indexed: 01/11/2023]
Abstract
The aim of this study was to investigate the protective effects of N-acetylcysteine (NAC) on peroxidative and apoptotic changes in the contused lungs of rats following blunt chest trauma. The rats were randomly divided into three groups: control, contusion, and contusion + NAC. All the rats, apart from those in the control group, performed moderate lung contusion. A daily intramuscular NAC injection (150 mg/kg) was given immediately following the blunt chest trauma and was continued for two additional days following cessation of the trauma. Samples of lung tissue were taken in order to evaluate the tissue malondialdehyde (MDA) level, histopathology, and epithelial cell apoptosis using terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) assay and active caspase-3 immunostaining. In addition, we immunohistochemically evaluated the expression of surfactant protein D (SP-D) in the lung tissue. The blunt chest trauma-induced lung contusion resulted in severe histopathological injury, as well as an increase in the MDA level and in the number of cells identified on TUNEL assay together with active caspase-3 positive epithelial cells, but a decrease in the number of SP-D positive alveolar type 2 (AT-2) cells. NAC treatment effectively attenuated histopathologic, peroxidative, and apoptotic changes, as well as reducing alterations in SP-D expression in the lung tissue. These findings indicate that the beneficial effects of NAC administrated following blunt chest trauma is related to the regulation of oxidative stress and apoptosis.
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Han F, Luo Y, Li Y, Liu Z, Xu D, Jin F, Li Z. Seawater induces apoptosis in alveolar epithelial cells via the Fas/FasL-mediated pathway. Respir Physiol Neurobiol 2012; 182:71-80. [PMID: 22609371 DOI: 10.1016/j.resp.2012.05.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2011] [Revised: 05/09/2012] [Accepted: 05/10/2012] [Indexed: 01/11/2023]
Abstract
Our previous study showed that seawater can cause lung tissue cell apoptosis; in the present study, the immunohistochemistry and Western blot analysis results demonstrated that Fas, FasL, and cleaved caspase-8 and caspase-3 were up-regulated in the rat lungs exposed to seawater. We found that seawater-induced human lung alveolar epithelial A549 cell apoptosis was concentration and time dependent. Moreover, seawater increased the expression of Fas, FasL, and cleaved caspase-8 and caspase-3 in A549 cells. The incubation of A549 cells in the presence of FasL-neutralising antibody (NOK-2) or caspase-8 inhibitor (Z-IETD-FMK) resulted in a decrease of seawater-induced cell apoptosis. NOK-2 inhibited Fas/FasL interaction and reduced the cleavage of caspase-8 and caspase-3, and Z-IETD-FMK blocked caspase-8 and caspase-3 activation. Seawater similarly produced a significant increase in rat alveolar type II cell apoptosis and expression of Fas and cleaved caspase-8. In summary, the Fas/FasL pathway involved in alveolar epithelial cell (AEC) apoptosis could be important in the pathogenesis of seawater-induced acute lung injury (SW-ALI).
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Affiliation(s)
- Feng Han
- Department of Respiratory Medicine, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, PR China
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Minami M, Sobue S, Ichihara M, Hasegawa T. Analysis of the pathological lesions of the lung in a mouse model of cutaneous infection with Streptococcus pyogenes. Pathol Int 2011; 62:99-104. [PMID: 22243779 DOI: 10.1111/j.1440-1827.2011.02756.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Invasive diseases such as toxic shock syndrome caused by Streptococcus pyogenes (S. pyogenes) are re-emerging infectious diseases. The mechanism of pathogenesis is not completely understood although the virulence of this organism has been analyzed using animal model systems, particularly using mice. The analysis of the progression of infection, however, is difficult. Computed tomography (CT) scanning is an extremely powerful technique that we applied to the mouse model of cutaneous infection with S. pyogenes. Two or three days after subcutaneous administration of bacteria, high density reticular areas were detected in the lung by CT. Histopathological examination of the lung was performed to examine the results of CT. Increased numbers of cytokeratin-positive epithelial cells, probably alveolar type II epithelial cells, were detected but no remarkable increase of inflammatory cell infiltrates was observed. Our results show that the pathological lesions of the lung in this model, wherein relatively few numbers of neutrophils were in the alveoli, are well correlated with the lung of a part of streptococcal toxic shock syndrome patients. Therefore, CT may be useful in assessing the progression of S. pyogenes infection, particularly in the pathological lesions of the lung in this model.
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Affiliation(s)
- Masaaki Minami
- Department of Bacteriology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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Li JH, Xu M, Xie XY, Fan QX, Mu DG, Zhang Y, Cao FL, Wang YX, Zhao PT, Zhang B, Jin FG, Li ZC. Tanshinone IIA suppresses lung injury and apoptosis, and modulates protein kinase B and extracellular signal-regulated protein kinase pathways in rats challenged with seawater exposure. Clin Exp Pharmacol Physiol 2011; 38:269-77. [PMID: 21314841 DOI: 10.1111/j.1440-1681.2011.05498.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
1. Tanshinone IIA (TIIA) is one of the main active components of the Chinese herb, Danshen. In the present study, we investigated the role of apoptosis in seawater exposure-induced acute lung injury (ALI), and explored the effects of TIIA on lung injury, apoptosis, and protein kinase B (Akt) and extracellular signal-regulated protein kinase (ERK) pathways in seawater-challenged rats. The rats were randomly divided into four groups: (i) naive group, no drug was given; (ii) TIIA control group, TIIA (50 mg/kg) was given intraperitoneally; (iii) seawater (SW) group, seawater (4 mL/kg) was given; and (iv) TIIA/SW group, TIIA (50 mg/kg) was injected intraperitoneally 10 min after seawater instillation. 2. The results showed that TIIA treatment significantly improved seawater exposure-induced lung histopathological changes, alleviated the decrease in PaO(2) , and reduced lung oedema, vascular leakage and cell infiltration. As shown by terminal deoxynucleotidyl transferase-mediated nick end labelling (TUNEL) assay, seawater exposure induced apoptosis in lung tissue cells. Furthermore, seawater exposure also changed apoptosis-related factors Bcl-2 and caspase-3, and caused a reduction in the activation of Akt and ERK1/2 pathways. Furthermore, TIIA treatment decreased the number of apoptotic cells, reversed changes in Bcl-2 and caspase-3, and upregulated the activation of Akt and ERK1/2 in seawater-challenged rats. 3. In conclusion, the data suggest that apoptosis might play an important role in seawater exposure-induced lung injury and that TIIA could significantly attenuate the severity of ALI and apoptosis in seawater-challenged rats, which is possibly through modulation of Akt and ERK1/2 pathways.
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Affiliation(s)
- Jia-Huan Li
- Department of Respiration, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
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Lopez AD, Avasarala S, Grewal S, Murali AK, London L. Differential role of the Fas/Fas ligand apoptotic pathway in inflammation and lung fibrosis associated with reovirus 1/L-induced bronchiolitis obliterans organizing pneumonia and acute respiratory distress syndrome. THE JOURNAL OF IMMUNOLOGY 2010; 183:8244-57. [PMID: 20007588 DOI: 10.4049/jimmunol.0901958] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Bronchiolitis obliterans organizing pneumonia (BOOP) and acute respiratory distress syndrome (ARDS) are two clinically and histologically distinct syndromes sharing the presence of an inflammatory and fibrotic component. Apoptosis via the Fas/Fas ligand (FasL) pathway plays an important role in the development of acute lung injury and fibrosis characteristic of these and other pulmonary inflammatory and fibrotic syndromes. We evaluated the role of apoptosis via the Fas/FasL pathway in the development of pulmonary inflammation and fibrosis in reovirus 1/L-induced BOOP and ARDS. CBA/J mice were intranasally inoculated with saline, 1 x 10(6) (BOOP), or 1 x 10(7) (ARDS) PFU reovirus 1/L, and evaluated at various days postinoculation for in situ apoptosis by TUNEL analysis and Fas/FasL expression. Our results demonstrate the presence of apoptotic cells and up-regulation of Fas/FasL expression in alveolar epithelium and in infiltrating cells during the inflammatory and fibrotic stages of both reovirus 1/L-induced ARDS and BOOP. Treatment of mice with the caspase 8 inhibitor, zIETD-fmk, inhibited apoptosis, inflammation, and fibrotic lesion development in reovirus 1/L-induced BOOP and ARDS. However, CBA/KlJms-Fas(lpr-cg)/J mice, which carry a point mutation in the Fas cytoplasmic region that abolishes the ability of Fas to transduce an apoptotic signal, do not develop pulmonary inflammation and fibrotic lesions associated with reovirus 1/L-induced BOOP, but still develop inflammation and fibrotic lesions associated with reovirus 1/L-induced ARDS. These results suggest a differential role for the Fas/FasL apoptotic pathway in the development of inflammation and fibrotic lesions associated with BOOP and ARDS.
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Affiliation(s)
- Andrea D Lopez
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC 29425, USA
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Deniz T, Agalar C, Agalar F, Comu FM, Caglayan O, Alpay Y, Saygun O. The Effect of Hypothermia on Splanchnic Flows and Lung in a Two-Hit Hemorrhagic Shock Model. J Surg Res 2010; 158:121-6. [DOI: 10.1016/j.jss.2008.08.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Revised: 08/07/2008] [Accepted: 08/19/2008] [Indexed: 12/22/2022]
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Sriram N, Kalayarasan S, Sudhandiran G. Epigallocatechin-3-gallate exhibits anti-fibrotic effect by attenuating bleomycin-induced glycoconjugates, lysosomal hydrolases and ultrastructural changes in rat model pulmonary fibrosis. Chem Biol Interact 2009; 180:271-80. [PMID: 19497426 DOI: 10.1016/j.cbi.2009.02.017] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2008] [Revised: 02/24/2009] [Accepted: 02/28/2009] [Indexed: 12/17/2022]
Abstract
Pulmonary fibrosis is characterized by excessive deposition of extracellular matrix components in the alveolar space, which hampers normal respiration process. Pathophysiological enzymes, glycoprotein moieties and matrix degrading lysosomal hydrolases are key markers and play a crucial role in the progression of fibrosis. Bleomycin is an anti-neoplastic drug, used for the treatment of various types of cancers and induces pulmonary fibrosis due its deleterious side effect. Tea catechin epigallocatechin-3-gallate (EGCG) is known for its wide array of beneficial effects. The present study was intended to evaluate the beneficial efficacy of EGCG against bleomycin-induced glycoconjugates, lysosomal hydrolases and ultrastructural changes in the lungs of Wistar rats. Intratracheal instillation of bleomycin (6.5 U/kg body weight) to rats increased the activities of pathophysiological enzymes such as aspartate transaminase, alanine transaminase, lactate dehydrogenase and alkaline phosphatase, which were attenuated upon EGCG treatment. The increased level of hydroxyproline and histopathological parameters in bleomycin-induced rats were decreased upon EGCG treatment. Bleomycin-induced increase in the level of glycoconjugates was restored closer to normal levels on EGCG treatment. Furthermore, the increased activities of matrix degrading lysosomal enzymes in bleomycin-induced rats were reduced upon EGCG supplementation. Treatment with EGCG also attenuated bleomycin-induced ultrastructural changes as observed from transmission electron microscopy studies. The results of the present study put-forward EGCG as a potential anti-fibrotic agent due to its attenuating effect on potential fibrotic markers.
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Affiliation(s)
- Narayanan Sriram
- Department of Biochemistry, University of Madras, Guindy Campus, Chennai 600025, India
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Sriram N, Kalayarasan S, Sudhandiran G. Epigallocatechin-3-gallate augments antioxidant activities and inhibits inflammation during bleomycin-induced experimental pulmonary fibrosis through Nrf2-Keap1 signaling. Pulm Pharmacol Ther 2008; 22:221-36. [PMID: 19138753 DOI: 10.1016/j.pupt.2008.12.010] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Revised: 12/01/2008] [Accepted: 12/10/2008] [Indexed: 12/31/2022]
Abstract
The mechanism involved in the enhancement of antioxidant activities and resolved inflammation after epigallocatechin-3-gallate (EGCG) treatment during bleomycin-induced pulmonary fibrosis is investigated in this study. The levels of reactive-oxygen species (ROS), lipid peroxidation (LPO), hydroxyproline and the activity of myeloperoxidase (MPO) were increased due to bleomycin challenge and were brought back to near normal status on EGCG supplementation. The decreased antioxidant status due to bleomycin challenge was also restored upon EGCG treatment. Bleomycin-induced rats showed increased cell counts as compared to control and EGCG-treated rats. Histopathological analysis showed increased inflammation and alveolar damage, while picrosirius red staining showed an increased collagen deposition in bleomycin-challenged rats that were decreased upon EGCG treatment. Immunohistochemical, immunofluorescent and immunoblot studies revealed that EGCG supplementation decreased the levels of nuclear factor-kappaB (NF-kappaB), tumor necrosis factor-alpha (TNF-alpha) and interleukin-1 beta (IL-1 beta), which were increased upon bleomycin induction. The declined activities of Phase II enzymes such as glutathione-S-transferase (GST) and NAD(P)H:quinone oxidoreductase 1 (NQO1) in bleomycin-injured rats were restored upon EGCG treatment. Confocal microscopy, immunoblot and RT-PCR studies confirm that EGCG is a potent inducer of NF-E2-related factor 2 (Nrf2). Expression of Kelch like ECH-associated protein (Keap)-1, a vital factor in Nrf2 signaling cascade was analyzed by immunoblotting. However, there was no significant change in the expression of Keap1 in control and experimental groups. This study demonstrates the involvement of Nrf2-Keap1 signaling through which EGCG enhances antioxidant activities and Phase II enzymes with subsequent restraint inflammation during bleomycin-induced pulmonary fibrosis.
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Affiliation(s)
- Narayanan Sriram
- Department of Biochemistry, University of Madras, Guindy Campus, Chennai 600 025, Tamilnadu, India
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Tang PS, Mura M, Seth R, Liu M. Acute lung injury and cell death: how many ways can cells die? Am J Physiol Lung Cell Mol Physiol 2008; 294:L632-41. [DOI: 10.1152/ajplung.00262.2007] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Apoptosis has been considered as an underlying mechanism in acute lung injury/acute respiratory distress syndrome and multiorgan dysfunction syndrome. Recently, several alternative pathways for cell death (such as caspase-independent cell death, oncosis, and autophagy) have been discovered. Evidence of these pathways in the pathogenesis of acute lung injury has also come into light. In this article, we briefly introduce cell death pathways and then focus on studies related to lung injury. The different types of cell death that occur and the underlying mechanisms utilized depend on both experimental and clinical conditions. Lipopolysaccharide-induced acute lung injury is associated with apoptosis via Fas/Fas ligand mechanisms. Hyperoxia and ischemia-reperfusion injury generate reactive oxidative species, which induce complex cell death patterns composed of apoptosis, oncosis, and necrosis. Prolonged overexpression of inflammatory mediators results in increased production and activation of proteases, especially cathepsins. Activation and resistance to death of neutrophils also plays an important role in promoting parenchymal cell death. Knowledge of the coexisting multiple cell death pathways and awareness of the pharmacological inhibitors targeting different proteases critical to cell death may lead to the development of novel therapies for acute lung injury.
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Dos Santos CC. Advances in mechanisms of repair and remodelling in acute lung injury. Intensive Care Med 2008; 34:619-30. [PMID: 18264692 DOI: 10.1007/s00134-007-0963-x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2006] [Accepted: 09/03/2007] [Indexed: 11/25/2022]
Abstract
BACKGROUND Acute respiratory distress syndrome (ARDS) is the most severe manifestation of acute lung injury (ALI). In patients who survive the acute injury the process of repair and remodelling may be an independent risk factor determining morbidity and mortality. This review explores recent advances in the field of fibroproliferative ARDS/ALI, with a special emphasis on (a) the primary contributing factors with a focus on cellular and soluble factors, and (b) mechanisms involved in repair and remodelling as they pertain to the importance of cell death, re-population, and matrix deposition. DISCUSSION Factors influencing progression to fibroproliferative ARDS vs. resolution and reconstitution of the normal pulmonary parenchymal architecture are poorly understood. Determinants of persistent injury and abnormal repair and remodelling may be profoundly affected by both environmental and genetic factors. Moreover, cumulative evidence suggests that acute inflammation and fibrosis may be in part independent and interactive processes that are autonomously regulated and thus amenable to individual and specific therapy. CONCLUSIONS Although our current understanding of these processes is limited by the inability to accurately replicate the complex human physiology in laboratory settings, it has recently become apparent that the process of repair and remodelling begins early in the course of ARDS/ALI and may be determined by the type of pulmonary injury. Understanding the mechanisms leading to and regulating fibroproliferative changes may contribute to the development of novel early therapeutic interventions in ARDS/ALI patients.
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Affiliation(s)
- Claudia C Dos Santos
- Interdepartmental Division of Critical Care, University of Toronto, 30, Bond Street 4-008, M5G 1W8, Toronto, Ontario, Canada.
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DeClue AE, Cohn LA. Acute respiratory distress syndrome in dogs and cats: a review of clinical findings and pathophysiology. J Vet Emerg Crit Care (San Antonio) 2007. [DOI: 10.1111/j.1476-4431.2007.00247.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Demiralay R, Gürsan N, Erdem H. Regulation of nicotine-induced apoptosis of pulmonary artery endothelial cells by treatment of N-acetylcysteine and vitamin E. Hum Exp Toxicol 2007; 26:595-602. [PMID: 17884964 DOI: 10.1177/0960327106070079551] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This study investigated the frequency of apoptosis in rat pulmonary artery endothelial cells after intraperitoneal nicotine injection, examining the roles of the inflammatory markers myeloperoxidase (MPO), tumour necrosis factor alpha (TNF-alpha), and vascular endothelial growth factor (VEGF) in nicotine-induced vascular damage and the protective effects of two known antioxidant agents, N-acetylcysteine (NAC) and vitamin E. Female Wistar rats were divided into four groups, each composed of nine rats: negative control group, positive control group, NAC-treated group (500 mg/kg), and vitamin E-treated group (500 mg/kg). Nicotine was intraperitoneally injected at a dosage of 0.6 mg/kg for 21 days. Following nicotine injection, the antioxidants were administered orally; treatment was continued until the rats were killed. Lung tissue samples were stained with hematoxylin-eosin (H&E) for histopathological assessments. Apoptosis level in endothelial cells was determined by using TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick end-labelling) method. Staining of cytoplasmic TNF-alpha and VEGF in endothelial cells, and perivascular MPO activity were evaluated by immunohistochemistry. The treatments with NAC and vitamin E significantly reduced the rate of nicotine-induced endothelial cell apoptosis. NAC and vitamin E significantly reduced the increases in the local production of TNF-alpha and VEGF, and perivascular MPO activity. This findings suggest that NAC can be as effective as vitamin E in protecting against nicotine-induced endothelial cell apoptosis.
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Affiliation(s)
- R Demiralay
- Süleyman Demirel University, School of Medicine, Department of Pulmonary Medicine, Isparta, Turkey.
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Demiralay R, Gürsan N, Ozbilim G, Erdogan G, Demirci E. Comparison of the effects of erdosteine and N-acetylcysteine on apoptosis regulation in endotoxin-induced acute lung injury. J Appl Toxicol 2007; 26:301-8. [PMID: 16489578 DOI: 10.1002/jat.1133] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study was carried out to investigate comparatively the frequency of apoptosis in lung epithelial cells after intratracheal instillation of endotoxin [lipopolysaccharide (LPS)] in rats and the role of tumor necrosis factor alpha (TNF-alpha) on apoptosis, and the effects of erdosteine and N-acetylcysteine on the regulation of apoptosis. Female Wistar rats were given oral erdosteine (10-500 mg kg(-1)) or N-acetylcysteine (10-500 mg kg(-1)) once a day for 3 consecutive days. Then the rats were intratracheally instilled with LPS (5 mg kg(-1)) to induce acute lung injury. The rats were killed at 24 h after LPS administration. Lung tissue samples were stained with hematoxylin-eosin for histopathological assessments. The apoptosis level in the lung bronchial and bronchiolar epithelium was determined using the TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick endlabelling) method. Cytoplasmic TNF-alpha was evaluated by immunohistochemistry. Pretreatment with erdosteine and pretreatment with N-acetylcysteine at a dose of 10 mg kg(-1) had no protective effect on LPS-induced lung injury. When the doses of drugs increased, the severity of the lung damage caused by LPS decreased. It was found that as the pretreatment dose of erdosteine was increased, the rate of apoptosis induced by LPS in lung epithelial cells decreased and this decrease was statistically significant in doses of 300 mg kg(-1) and 500 mg kg(-1). Pretreatment with N-acetylcysteine up to a dose of 500 mg kg(-1) did not show any significant effect on apoptosis regulation. It was noticed that both antioxidants had no significant effect on the local production level of TNF-alpha. These findings suggest that erdosteine could be a possible therapeutic agent for acute lethal lung injury and its mortality.
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Affiliation(s)
- Rezan Demiralay
- Süleyman Demirel University, School of Medicine, Department of Pulmonary Medicine, Isparta, Turkey.
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Rivo J, Zeira E, Galun E, Einav S, Linden J, Matot I. Attenuation of reperfusion lung injury and apoptosis by A2A adenosine receptor activation is associated with modulation of Bcl-2 and Bax expression and activation of extracellular signal-regulated kinases. Shock 2007; 27:266-73. [PMID: 17304107 DOI: 10.1097/01.shk.0000235137.13152.44] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Adenosine receptors (AR) and extracellular signal-regulated kinases (ERK) have been implicated in tissue protection and apoptosis regulation during ischemia/reperfusion (I/R) injury. This study tests the hypothesis that reduction of reperfusion lung injury after A2A AR activation is associated with attenuation of apoptosis, modulation of ERK activation, and alterations in antiapoptotic and proapoptotic protein expression (Bcl-2 and Bax, respectively). Experiments were performed in intact-chest, spontaneously breathing cats in which the arterial branch of the left lower lung lobe was occluded for 2 h and reperfused for 3 h (I/R group). Animals were treated with the selective A2A AR agonist ATL313 given 5 min before reperfusion alone or in combination with the selective A2A AR antagonist ZM241385. Western blot analysis showed significant reduction in expression of Bcl-2 and increase in expression of Bax after reperfusion, compared with control lungs. Phosphorylated ERK1/2 levels were also increased after reperfusion. Compared with the I/R group, ATL313 markedly (P < 0.01) attenuated indices of injury and apoptosis including the percentage of injured alveoli, wet-dry weight ratio, myeloperoxidase activity, in situ terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end-labeling-positive cells, and caspase 3 activity and expression. Furthermore, compared with reperfused lungs, in ATL313-pretreated lungs, Western blot analysis demonstrated substantial ERK1/2 activation, increased expression of Bcl-2, and attenuated expression of Bax. The protective effects of ATL313 were blocked by pretreatment with ZM241385. In summary, the present study shows that in vivo activation of A2A AR confers protection against reperfusion lung injury. This protection is associated with decreased apoptosis and involves ERK1/2 activation and alterations in antiapoptotic Bcl-2 and proapoptotic Bax proteins.
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Affiliation(s)
- Julia Rivo
- Department of Anesthesiology and Critical Care Medicine, Hadassah University Medical Center, The Hebrew University of Jerusalem, Jerusalem, Israel
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Regulation of sepsis-induced apoptosis of pulmonary cells by posttreatment of erdosteine and N-aceylcysteine. Toxicology 2006; 228:151-61. [DOI: 10.1016/j.tox.2006.08.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2006] [Revised: 08/17/2006] [Accepted: 08/18/2006] [Indexed: 11/19/2022]
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Ghanem MM, Battelli LA, Mercer RR, Scabilloni JF, Kashon ML, Ma JY, Nath J, Hubbs AF. Apoptosis and Bax expression are increased by coal dust in the polycyclic aromatic hydrocarbon-exposed lung. ENVIRONMENTAL HEALTH PERSPECTIVES 2006; 114:1367-73. [PMID: 16966090 PMCID: PMC1570065 DOI: 10.1289/ehp.8906] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
BACKGROUND Miners inhaling respirable coal dust (CD) frequently develop coal workers' pneumoconiosis, a dust-associated pneumoconiosis characterized by lung inflammation and variable fibrosis. Many coal miners are also exposed to polycyclic aromatic hydrocarbon (PAH) components of diesel engine exhaust and cigarette smoke, which may contribute to lung disease in these workers. Recently, apoptosis was reported to play a critical role in the development of another pneumoconiosis of miners, silicosis. In addition, CD was reported to suppress cytochrome P450 1A1 (CYP1A1) induction by PAHs. METHODS We investigated the hypothesis that apoptosis plays a critical role in lung injury and down-regulation of CYP1A1 induction in mixed exposures to CD and PAHs. We exposed rats intratracheally to 0.0, 2.5, 10.0, 20.0, or 40.0 mg/rat CD and, 11 days later, to intraperitoneal beta-naphthoflavone (BNF) , a PAH. In another group of rats exposed to CD and BNF, caspase activity was inhibited by injection of the pan-caspase inhibitor Q-VD-OPH [quinoline-Val-Asp (OMe) -CH2-OPH]. RESULTS In rats exposed to BNF, CD exposure increased alveolar expression of the proapoptotic mediator Bax but decreased CYP1A1 induction relative to BNF exposure alone. Pan-caspase inhibition decreased CD-associated Bax expression and apoptosis but did not restore CYP1A1 activity. Further, CD-induced lung inflammation and alveolar epithelial cell hypertrophy and hyperplasia were not suppressed by caspase inhibition. CONCLUSIONS Combined BNF and CD exposure increased Bax expression and apoptosis in the lung, but Bax and apoptosis were not the major determinants of early lung injury in this model.
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Affiliation(s)
- Mohamed M. Ghanem
- Genetics and Developmental Biology Program, West Virginia University, Morgantown, West Virginia, USA
- Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
| | - Lori A. Battelli
- Genetics and Developmental Biology Program, West Virginia University, Morgantown, West Virginia, USA
- Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
| | - Robert R. Mercer
- Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
| | - James F. Scabilloni
- Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
| | - Michael L. Kashon
- Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
| | - Jane Y.C. Ma
- Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
| | - Joginder Nath
- Genetics and Developmental Biology Program, West Virginia University, Morgantown, West Virginia, USA
| | - Ann F. Hubbs
- Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
- Address correspondence to A. Hubbs, Pathology and Physiology Research Branch, Health Effect Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, 1095 Willowdale Rd., Morgantown, WV 26505 USA. Telephone: (304) 285-6128. Fax: (304) 285-5938. E-mail:
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Demiralay R, Gürsan N, Erdem H. The effects of erdosteine, N-acetylcysteine, and vitamin E on nicotine-induced apoptosis of pulmonary cells. Toxicology 2006; 219:197-207. [PMID: 16377052 DOI: 10.1016/j.tox.2005.11.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2005] [Revised: 11/15/2005] [Accepted: 11/15/2005] [Indexed: 10/25/2022]
Abstract
This study was conducted to investigate the frequency of apoptosis in the pulmonary epithelial cells of rats after intratraperitoneal nicotine injection, in order to examine the role of inflammatory markers [myeloperoxidase (MPO) and tumor necrosis factor-alpha (TNF-alpha)] in nicotine-induced lung damage, and to determine the protective effects of three known antioxidant agents [N-acetylcysteine (NAC), erdosteine, and vitamin E] on the lung toxicity of nicotine in the lungs. Female Wistar rats were divided into seven groups, each composed of nine rats: two negative control groups, two positive control groups, one erdosteine-treated group (500 mg/kg), one NAC-treated group (500 mg/kg), and one vitamin E-treated group (500 mg/kg). Nicotine was injected intraperitoneally at a dosage of 0.6 mg/kg for 21 days. Following nicotine injection, the antioxidants were administered orally, treatment was continued until the rats were killed. Lung tissue samples were stained with hematoxylin-eosin (H&E) for histopathological assessments. The apoptosis level in the lung bronchiolar and alveolar epithelium was determined by using the terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling (TUNEL) method. Cytoplasmic TNF-alpha in the bronchiolar and alveolar epithelial cells and the lung MPO activity were evaluated immunohistochemically. The protective effect of vitamin E on lung histology was stronger than that of erdosteine or NAC. Treatment with erdosteine, NAC, and vitamin E significantly reduced the rate of nicotine-induced pulmonary epithelial cell apoptosis, and there were no significant differences in apoptosis among the three antioxidants groups. Erdosteine, NAC, and vitamin E significantly reduced the increases in TNF-alpha staining and lung MPO activity. The effects of erdosteine on the increases in the local TNF-alpha level and lung MPO activity were weaker than that of NAC or vitamin E. This findings suggest that erdosteine and NAC can be as effective as vitamin E in protecting against nicotine-induced pulmonary cell apoptosis.
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Affiliation(s)
- Rezan Demiralay
- Department of Pulmonary Medicine, School of Medicine, Süleyman Demirel University, Isparta, Turkey.
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Topouzova-Hristova T, Daza P, Garcia-Herdugo G, Stephanova E. Volatile anaesthetic halothane causes DNA damage in A549 lung cells. Toxicol In Vitro 2005; 20:585-93. [PMID: 16314068 DOI: 10.1016/j.tiv.2005.10.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2005] [Revised: 10/07/2005] [Accepted: 10/15/2005] [Indexed: 11/21/2022]
Abstract
The present study was performed to elucidate the extent of damage and the ability of lung epithelial cells to recover or to undergo apoptosis after in vitro treatment with the volatile anaesthetic halothane. The results obtained from the comet assay clearly show that halothane, applied at 3.0mM concentration, causes DNA and cell damage. Cells exhibited nuclear fragmentation and budding early after treatment and these events gradually increased during the next few days. The presence of a large number of mini-comets after single cell gel electrophoresis was found to represent apoptotic bodies with fragmented DNA. Our results demonstrate apoptosis-like changes after in vitro exposure of A549 cells to the volatile anaesthetic halothane. The majority of the affected cells did not recover and were directed to cell death.
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Affiliation(s)
- T Topouzova-Hristova
- Department of Cytology, Histology and Embryology, Faculty of Biology, University of Sofia, 8 Dragan Tzankov Street, 1164 Sofia, Bulgaria
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Abstract
Elucidation of the biology of stem cells of the lung parenchyma could revolutionise treatment of patients with lung disorders such as cancer, acute respiratory distress syndrome, emphysema, and fibrotic lung disease. How close is this goal? Despite remarkable observations and ensuing advances, more questions than answers have been generated. Progenitors of the alveolar epithelium remain largely mysterious, so the prospect of isolating enough of these cells and delivering them effectively to cure disease remains remote. Similarly, the bone-marrow-derived cell that might most effectively engraft the lung remains unknown. If this mechanism is an important process for lung repair, why will the administration of additional cells be more effective? Finally, there is an issue of control of multipotent cells to avoid the generation of multiple teratomas, longevity of the graft, and possible immunological reactions to gene products inserted to replace a deficiency. The biology is exciting but not yet well enough understood to support therapeutic advances.
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Affiliation(s)
- Mark J D Griffiths
- Unit of Critical Care, Imperial College London at National Heart and Lung Institute and Royal Brompton Hospital, London, UK
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Abstract
The mode of cell death termed apoptosis, sometimes referred to as programmed cell death, is as critical a determinant of cell population size as is cell proliferation. Although best characterized in cells of the immune system, apoptosis is now known to be a key factor in the maintenance of normal cell turnover within structural cells in the parenchyma of virtually every organ. Recent interest in apoptosis in the lung has sparked a surge of investigations designed to determine the roles of apoptosis in lung development, injury, and remodeling. Of particular recent interest are the roles of apoptosis in disease pathogenesis and resolution, in which the concept of apoptosis as a "programmed" cell death, i.e., genetically determined, is often more accurately viewed as "inappropriate cell suicide" with regard to its extent and/or timing. Data accumulating over the past decade have made clear the complexity of the control of lung cell apoptosis; concepts of the regulation of apoptosis originally determined in classical cell culture models are often, but not always, applicable to structural cells. For this reason, each of the many cell types of the lung must be studied as a potentially new subject with its own idiosyncrasies yet to be discovered. In light of the large volume of literature now available, this article focuses on the roles of apoptosis in three pathophysiological contexts: acute respiratory distress syndrome, chronic obstructive pulmonary disease, and pulmonary fibrosis. Each section presents key data describing the evidence for apoptosis in the lung, its possible relevance to disease pathogenesis, and proposed mechanisms that might suggest potential avenues for therapeutic intervention.
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Affiliation(s)
- Xiaopeng Li
- Dept. of Physiology, Michigan State University, 3185 Biomedical and Physical Sciences Bldg., East Lansing, MI 48824, USA
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Prince LS, Okoh VO, Moninger TO, Matalon S. Lipopolysaccharide increases alveolar type II cell number in fetal mouse lungs through Toll-like receptor 4 and NF-κB. Am J Physiol Lung Cell Mol Physiol 2004; 287:L999-1006. [PMID: 15475494 DOI: 10.1152/ajplung.00111.2004] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Chorioamnionitis is a major cause of preterm delivery. Infants exposed to inflammation in utero and then born preterm may have improved lung function in the immediate postnatal period. We developed a mouse model of chorioamnionitis to study the inflammatory signaling mechanisms that might influence fetal lung maturation. With this in vivo model, we found that Escherichia coli lipopolysaccharide (LPS) increased the number of alveolar type II cells in the fetal mouse lung. LPS also increased type II cell number in cultured fetal lung explants, suggesting that LPS could directly signal the fetal lung in the absence of maternal influences. Using immunostaining, we localized cells within the fetal mouse lung expressing the LPS receptor molecule Toll-like receptor 4 (TLR4). Similar to the signaling pathways in inflammatory cells, LPS activated NF-κB in fetal lung explants. Activation of the TLR4/NF-κB pathway appeared to be required, as LPS did not increase the number of type II cells in C.C3H- Tlr4 Lps-d mice, a congenic strain containing a loss of function mutation in tlr4. In addition, the sesquiterpene lactone parthenolide inhibited NF-κB activation following LPS exposure and blocked the LPS-induced increase in type II cells. On the basis of these data from our mouse model of chorioamnionitis, it appears that LPS specifically activated the TLR4/NF-κB pathway, leading to increased type II cell maturation. These data implicate an important signaling mechanism in chorioamnionitis and suggest the TLR4/NF-κB pathway can influence lung development.
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Affiliation(s)
- Lawrence S Prince
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama 35249, USA.
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Ghanem MM, Porter D, Battelli LA, Vallyathan V, Kashon ML, Ma JY, Barger MW, Nath J, Castranova V, Hubbs AF. Respirable Coal Dust Particles Modify Cytochrome P4501A1 (CYP1A1) Expression in Rat Alveolar Cells. Am J Respir Cell Mol Biol 2004; 31:171-83. [PMID: 15072980 DOI: 10.1165/rcmb.2003-0425oc] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Cytochrome P4501A1 (CYP1A1) metabolizes polycyclic aromatic hydrocarbons in cigarette smoke to DNA-binding reactive intermediates associated with carcinogenesis. Epidemiologic studies indicate that the majority of coal miners are smokers but have a lower risk of lung cancer than other smokers. We hypothesized that coal dust (CD) exposure modifies pulmonary carcinogenesis by altering CYP1A1 induction. Therefore, male Sprague Dawley rats were intratracheally instilled with 2.5, 10, 20, or 40 mg CD/rat or vehicle (saline); and 11 d later, pulmonary CYP1A1 was induced by intraperitoneal injection of beta-naphthoflavone (BNF; 50 mg/kg). Fourteen days after CD exposure, CYP1A1 protein and activity were measured by Western blot and 7-ethoxyresorufin-O-deethylase activity, respectively. CYP1A1 and the alveolar type II markers, cytokeratins 8/18, were localized and quantified in lung sections by dual immunofluorescence with morphometry. The area of CYP1A1 expression in alveolar septa and alveolar type II cells in response to BNF was reduced by exposure to 20 or 40 mg CD compared with BNF alone. CD exposure significantly inhibited BNF-induced 7-ethoxyresorufin-O-deethylase activity in a dose-responsive manner. By Western blot, induction of CYP1A1 protein by BNF was significantly reduced by 40 mg CD compared with BNF alone. These findings indicate that CD decreases BNF-induced CYP1A1 protein expression and activity in the lung.
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Affiliation(s)
- Mohamed M Ghanem
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV 26505, USA
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Abstract
The acute respiratory distress syndrome (ARDS) is a process of acute inflammatory lung injury that affects a diverse array of surgical and medical patients. The syndrome is mediated by a complex and interacting system of chemical mediators produced by several types of pulmonary cells. Regardless of the predisposing causes, activation of the nuclear factor kappa B seems to be, at the molecular level, a signature event of ARDS, leading to the rapid activation of intracellular signaling pathways, which coordinate the induction of multiple genes encoding inflammatory mediators. There are at least two compelling reasons for promoting an understanding of these interactions and their molecular mediators and second messengers: new therapies intended to modulate these factors continue to be developed, and the levels of some of these molecules, most notably cytokines, may serve as early indicators of the onset of ARDS.
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Affiliation(s)
- Jose L Balibrea
- Department of Surgery, Hospital Clinico San Carlos, Universidad Complutense, 28040, Madrid, Spain
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