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Lee CE, Raduka A, Gao N, Hussain A, Rezaee F. 8-Bromo-cAMP attenuates human airway epithelial barrier disruption caused by titanium dioxide fine and nanoparticles. Tissue Barriers 2024:2300579. [PMID: 38166590 DOI: 10.1080/21688370.2023.2300579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/22/2023] [Indexed: 01/05/2024] Open
Abstract
Titanium dioxide fine particles (TiO2-FPs) and nanoparticles (TiO2-NPs) are the most widely used whitening pigments worldwide. Inhalation of TiO2-FPs and TiO2-NPs can be harmful as it triggers toxicity in the airway epithelial cells. The airway epithelium serves as the respiratory system's first line of defense in which airway epithelial cells are significant targets of inhaled pathogens and environmental particles. Our group previously found that TiO2-NPs lead to a disrupted barrier in the polarized airway epithelial cells. However, the effect of TiO2-FPs on the respiratory epithelial barrier has not been examined closely. In this study, we aimed to compare the effects of TiO2-FPs and TiO2-NPs on the structure and function of the airway epithelial barrier. Additionally, we hypothesized that 8-Bromo-cAMP, a cyclic adenosine monophosphate (cAMP) derivative, would alleviate the disruptive effects of both TiO2-FPs and TiO2-NPs. We observed increased epithelial membrane permeability in both TiO2-FPs and TiO2-NPs after exposure to 16HBE cells. Immunofluorescent labeling showed that both particle sizes disrupted the structural integrity of airway epithelial tight junctions and adherens junctions. TiO2-FPs had a slightly more, but insignificant impact on the epithelial barrier disruption than TiO2-NPs. Treatment with 8-Bromo-cAMP significantly attenuated the barrier-disrupting impact of both TiO2-FPs and TiO2-NPs on cell monolayers. Our study demonstrates that both TiO2-FPs and TiO2-NPs cause comparable barrier disruption and suggests a protective role for cAMP signaling. The observed effects of TiO2-FPs and TiO2-NPs provide a necessary understanding for characterizing the pathways involved in the defensive role of the cAMP pathway on TiO2-induced airway barrier disruption.
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Affiliation(s)
- Claire E Lee
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
- Department of Cognitive Science, College of Arts and Sciences, Case Western Reserve University, Cleveland, OH, USA
| | - Andjela Raduka
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Nannan Gao
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Aabid Hussain
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Fariba Rezaee
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
- Center for Pediatric Pulmonary Medicine, Cleveland Clinic Children's, Cleveland, OH, USA
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2
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Johnson AN, Dickinson J, Nelson A, Gaurav R, Kudrna K, Evans SE, Janike K, Wyatt TA, Poole JA. Effect of epithelial-specific MyD88 signaling pathway on airway inflammatory response to organic dust exposure. J Immunotoxicol 2023; 20:2148782. [PMID: 36538286 PMCID: PMC9912912 DOI: 10.1080/1547691x.2022.2148782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 11/11/2022] [Indexed: 12/24/2022] Open
Abstract
The Toll-like receptor (TLR) adaptor protein MyD88 is integral to airway inflammatory response to microbial-enriched organic dust extract (ODE) exposures. ODE-induced airway neutrophil influx and release of pro-inflammatory cytokines was essentially abrogated in global MyD88-deficient mice, yet these mice demonstrate an increase in airway epithelial cell mucin expression. To further elucidate the role of MyD88-dependent responses specific to lung airway epithelial cells in response to ODE in vivo, the surfactant protein C protein (SPC) Cre+ embryologic expressing airway epithelial cells floxed for MyD88 to disrupt MyD88 signaling were utilized. The inducible club cell secretory protein (CCSP) Cre+, MyD88 floxed, were also developed. Using an established protocol, mice were intranasally instilled with ODE or saline once or daily up to 3 weeks. Mice with MyD88-deficient SPC+ lung epithelial cells exhibited decreased neutrophil influx following ODE exposure once and repetitively for 1 week without modulation of classic pro-inflammatory mediators including tumor necrosis factor (TNF)-α, interleukin (IL)-6, and neutrophil chemoattractants. This protective response was lost after 3 weeks of repetitive exposure. ODE-induced Muc5ac mucin expression at 1 week was also reduced in MyD88-deficient SPC+ cells. Acute ODE-induced IL-33 was reduced in MyD88-deficient SPC+ cells whereas serum IgE levels were increased at one week. In contrast, mice with inducible MyD88-deficient CCSP+ airway epithelial cells demonstrated no significant difference in experimental indices following ODE exposure. Collectively, these findings suggest that MyD88-dependent signaling targeted to all airway epithelial cells plays an important role in mediating neutrophil influx and mucin production in response to acute organic dust exposures.
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Affiliation(s)
- Amber N. Johnson
- Pulmonary Critical Care and Sleep Division University of Nebraska Medical Center (UNMC), Omaha, NE
| | - John Dickinson
- Pulmonary Critical Care and Sleep Division University of Nebraska Medical Center (UNMC), Omaha, NE
| | - Amy Nelson
- Allergy and Immunology Division, Department of Internal Medicine, University of Nebraska Medical Center (UNMC), Omaha, NE
| | - Rohit Gaurav
- Allergy and Immunology Division, Department of Internal Medicine, University of Nebraska Medical Center (UNMC), Omaha, NE
| | - Katrina Kudrna
- Pulmonary Critical Care and Sleep Division University of Nebraska Medical Center (UNMC), Omaha, NE
| | - Scott E. Evans
- Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Katherine Janike
- Allergy and Immunology Division, Department of Internal Medicine, University of Nebraska Medical Center (UNMC), Omaha, NE
| | - Todd A. Wyatt
- Pulmonary Critical Care and Sleep Division University of Nebraska Medical Center (UNMC), Omaha, NE
- VA Nebraska Western Iowa Health Care System, Omaha, NE
- Department of Environmental, Agricultural and Occupational Health, UNMC, Omaha, NE
| | - Jill A. Poole
- Allergy and Immunology Division, Department of Internal Medicine, University of Nebraska Medical Center (UNMC), Omaha, NE
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3
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Liu XJ, Pang H, Long YQ, Wang JQ, Niu Y, Zhang RG. Pro-inflammatory action of formoterol in human bronchial epithelia. Mol Immunol 2023; 160:95-102. [PMID: 37413911 DOI: 10.1016/j.molimm.2023.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 06/19/2023] [Accepted: 06/26/2023] [Indexed: 07/08/2023]
Abstract
Despite the wide usage of β2-adrenoceptor agonists in asthma treatment, they do have side effects such as aggravating inflammation. We previously reported that isoprenaline induced Cl- secretion and IL-6 release via cAMP-dependent pathways in human bronchial epithelia, but the mechanisms underlying the inflammation-aggravation effects of β2-adrenoceptor agonists remain pooly understood. In this study, we investigated formoterol, a more specific β2-adrenoceptor agonist, -mediated signaling pathways involved in the production of IL-6 and IL-8 in 16HBE14o- human bronchial epithelia. The effects of formoterol were detected in the presence of PKA, exchange protein directly activated by cAMP (EPAC), cystic fibrosis transmembrane conductance regulator (CFTR), extracellular signal-regulated protein kinase (ERK)1/2 and Src inhibitors. The involvement of β-arrestin2 was determined using siRNA knockdown. Our results indicate that formoterol can induce IL-6 and IL-8 secretion in concentration-dependent manner. The PKA-specific inhibitor, H89, partially inhibited IL-6 release, but not IL-8. Another intracellular cAMP receptor, EPAC, was not involved in either IL-6 or IL-8 release. PD98059 and U0126, two ERK1/2 inhibitors, blocked IL-8 while attenuated IL-6 secretion induced by formoterol. Furthermore, formoterol-induced IL-6 and IL-8 release was attenuated by Src inhibitors, namely dasatinib and PP1, and CFTRinh172, a CFTR inhibitor. In addition, knockdown of β-arrestin2 by siRNA only suppressed IL-8 release when a high concentration of formoterol (1 μM) was used. Taken together, our results suggest that formoterol stimulates IL-6 and IL-8 release which involves PKA/Src/ERK1/2 and/or β-arrestin2 signaling pathways.
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Affiliation(s)
- Xing-Jian Liu
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
| | - Hao Pang
- First Clinical School, Guangdong Medical University, Zhanjiang, China
| | - Yu-Qian Long
- First Clinical School, Guangdong Medical University, Zhanjiang, China
| | - Ji-Qing Wang
- First Clinical School, Guangdong Medical University, Zhanjiang, China
| | - Ya Niu
- School of Biomedical Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong, China
| | - Rui-Gang Zhang
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China.
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Lucero‐Garcia Rojas EY, Reyes‐Alcaraz A, Ruan K, McConnell BK, Bond RA. Fusion of the
β
2
‐adrenergic
receptor with either Gαs or βarrestin‐2 produces constitutive signaling by each pathway and induces
gain‐of‐function
in
BEAS‐2B
cells. FASEB Bioadv 2022; 4:758-774. [DOI: 10.1096/fba.2022-00038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 08/29/2022] [Accepted: 09/07/2022] [Indexed: 11/11/2022] Open
Affiliation(s)
| | - Arfaxad Reyes‐Alcaraz
- Department of Pharmacology and Pharmaceutical Sciences, College of Pharmacy University of Houston Houston Texas USA
| | - Kehe Ruan
- Department of Pharmacology and Pharmaceutical Sciences, College of Pharmacy University of Houston Houston Texas USA
| | - Bradley K. McConnell
- Department of Pharmacology and Pharmaceutical Sciences, College of Pharmacy University of Houston Houston Texas USA
| | - Richard A. Bond
- Department of Pharmacology and Pharmaceutical Sciences, College of Pharmacy University of Houston Houston Texas USA
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Zhang FF, Wang H, Zhou YM, Yu HY, Zhang M, Du X, Wang D, Zhang F, Xu Y, Zhang JG, Zhang HT. Inhibition of phosphodiesterase-4 in the spinal dorsal horn ameliorates neuropathic pain via cAMP-cytokine-Cx43 signaling in mice. CNS Neurosci Ther 2022; 28:749-760. [PMID: 35156776 PMCID: PMC8981432 DOI: 10.1111/cns.13807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 12/13/2021] [Accepted: 12/28/2021] [Indexed: 01/21/2023] Open
Abstract
Background The spinal phosphodiesterase‐4 (PDE4) plays an important role in chronic pain. Inhibition of PDE4, an enzyme catalyzing the hydrolysis of cyclic adenosine monophosphate AMP (cAMP), produces potent antinociceptive activity. However, the antinociceptive mechanism remains largely unknown. Connexin43 (Cx43), a gap junction protein, has been shown to be involved in controlling pain transduction at the spinal level; restoration of Cx43 expression in spinal astrocytes to the normal levels reduces nerve injury‐induced pain. Here, we evaluate the novel mechanisms involving spinal cAMP‐Cx43 signaling by which PDE4 inhibitors produce antinociceptive activity. Methods First, we determined the effect of PDE4 inhibitors rolipram and roflumilast on partial sciatic nerve ligation (PSNL)‐induced mechanical hypersensitivity. Next, we observed the role of cAMP‐Cx43 signaling in the effect of PDE4 inhibitors on PSNL‐induced mechanical hypersensitivity. Results Single or repeated, intraperitoneal or intrathecal administration of rolipram or roflumilast significantly reduced mechanical hypersensitivity in mice following PSNL. In addition, repeated intrathecal treatment with either of PDE4 inhibitors reduced PSNL‐induced downregulation of cAMP and Cx43, and upregulation of proinflammatory cytokines tumor necrosis factor‐α (TNF‐α) and interleukin‐1β. Furthermore, the antinociceptive effects of PDE4 inhibitors were attenuated by the protein kinase A (PKA) inhibitor H89, TNF‐α, or Cx43 antagonist carbenoxolone. Finally, PSNL‐induced upregulation of PDE4B and PDE4D, especially the PDE4B subtype, was reduced by treatment with either of the PDE4 inhibitors. Conclusions The results suggest that the antinociceptive effect of PDE4 inhibitors is contributed by increasing Cx43 expression via cAMP‐PKA‐cytokine signaling in the spinal dorsal horn.
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Affiliation(s)
- Fang-Fang Zhang
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Hao Wang
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Yan-Meng Zhou
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Hai-Yang Yu
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Melanie Zhang
- Department of Neurobiology, Northwestern University Feinberg School of Medicine, Evanston, Illinois, USA
| | - Xian Du
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Dong Wang
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Feng Zhang
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Ying Xu
- Department of Pharmaceutical Sciences, School of Pharmacy & Pharmaceutical Sciences, University at Buffalo, the State University of New York, Buffalo, New York, USA
| | - Ji-Guo Zhang
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China
| | - Han-Ting Zhang
- Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China.,Department of Pharmacology, School of Pharmacy, Qingdao University, Qingdao, China
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6
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Pereira EWM, Heimfarth L, Santos TK, Passos FRS, Siqueira-Lima P, Scotti L, Scotti MT, Almeida JRGDS, Campos AR, Coutinho HDM, Martin P, Quintans-Júnior LJ, Quintans JSS. Limonene, a citrus monoterpene, non-complexed and complexed with hydroxypropyl-β-cyclodextrin attenuates acute and chronic orofacial nociception in rodents: Evidence for involvement of the PKA and PKC pathway. Phytomedicine 2022; 96:153893. [PMID: 35026511 DOI: 10.1016/j.phymed.2021.153893] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 12/05/2021] [Accepted: 12/11/2021] [Indexed: 06/14/2023]
Abstract
BACKGROUND Chronic orofacial pain is a serious public health problem with a prevalence of 7-11% in the population. This disorder has different etiologies and characteristics that make pharmacological treatment difficult. Natural products have been shown to be a promising source of treatments for the management of chronic pain, as an example the terpenes. PURPOSE The aim of this study was to evaluate the anti-nociceptive and anti-inflammatory effects of one of these terpenes, d-limonene (LIM - a common monoterpene found in citrus fruits) alone and complexed with hydroxypropyl-β-cyclodextrin (LIM/HPβCD) in preclinical animal models. METHODS Orofacial pain was induced by the administration of hypertonic saline on the corneal surface, the injection of formalin into the temporomandibular joint (TMJ), or chronic constriction injury of the infraorbital nerve (CCI-IoN). The study used male Wistar rats and Swiss mice treated with LIM (50 mg/kg), LIM/HPβCD (50 mg/kg), vehicle (control), gabapentin or morphine, and eyes wiping (induced by hypertonic saline), face rubbing (formalin-induced in TMJ) or mechanical hyperalgesia (provoked by CCI-IoN) were assessed. Additionally, ELISA was used to measure TNF-α, and western blot analysis to assess levels of PKAcα, NFκB, p38MAPK and phosphorylated PKC substrates. Serum levels of aspartate aminotransferase (AST) and alanine transferase (ALT) were also evaluated. RESULTS LIM and LIM/HPβCD significantly reduced (p < 0.001) corneal nociception and formalin-induced TMJ nociception. In addition, both substances attenuated (p < 0.001) mechanical hyperalgesia in the CCI-IoN model. The antinociceptive effect induced by LIM and HPβCD/LIM was associated with decreased TNF-α levels, downregulation of the NFκB and p38MAPK signalling pathways and reduced PKC substrate phosphorylation and PKA immunocontent. Moreover, the results demonstrated that complexation with HPβCD was able to decrease the therapeutic dose of LIM. CONCLUSION LIM was found to be a promising molecule for the treatment of orofacial pain due to its capacity to modulate some important mediators essential to the establishment of pain, and HPβCD can be a key tool to improve the profile of LIM.
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Affiliation(s)
- Erik W M Pereira
- Department of Physiology, Laboratory of Neuroscience and Pharmacological Assays (LANEF), Federal University of Sergipe, São Cristóvão, SE, Brazil; Health Sciences Graduate Program (PPGCS), Federal University of Sergipe, Aracaju, SE, Brazil
| | - Luana Heimfarth
- Department of Physiology, Laboratory of Neuroscience and Pharmacological Assays (LANEF), Federal University of Sergipe, São Cristóvão, SE, Brazil
| | - Tiffany Kb Santos
- Department of Physiology, Laboratory of Neuroscience and Pharmacological Assays (LANEF), Federal University of Sergipe, São Cristóvão, SE, Brazil
| | - Fabiolla R S Passos
- Department of Physiology, Laboratory of Neuroscience and Pharmacological Assays (LANEF), Federal University of Sergipe, São Cristóvão, SE, Brazil; Health Sciences Graduate Program (PPGCS), Federal University of Sergipe, Aracaju, SE, Brazil
| | | | | | | | | | - Adriana R Campos
- Experimental Biology Centre (NUBEX). University of Fortaleza, Fortaleza, CE, Brazil
| | | | - Patrick Martin
- Univ Artois, UniLaSalle, Unité Transformations & Agroressources, Béthune, France
| | - Lucindo J Quintans-Júnior
- Department of Physiology, Laboratory of Neuroscience and Pharmacological Assays (LANEF), Federal University of Sergipe, São Cristóvão, SE, Brazil; Health Sciences Graduate Program (PPGCS), Federal University of Sergipe, Aracaju, SE, Brazil
| | - Jullyana S S Quintans
- Department of Physiology, Laboratory of Neuroscience and Pharmacological Assays (LANEF), Federal University of Sergipe, São Cristóvão, SE, Brazil; Health Sciences Graduate Program (PPGCS), Federal University of Sergipe, Aracaju, SE, Brazil
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7
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Tavares LP, Galvão I, Ferrero MR. Novel Immunomodulatory Therapies for Respiratory Pathologies. Comprehensive Pharmacology 2022. [DOI: 10.1016/b978-0-12-820472-6.00073-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Colares TG, de Figueiredo CS, de Oliveira Jesus Souza L, Dos Santos AA, Giestal-de-Araujo E. Increased Retinal Ganglion Cell Survival by Exogenous IL-2 Depends on IL-10, Dopamine D1 Receptors, and Classical IL-2/IL-2R Signaling Pathways. Neurochem Res 2021; 46:1701-16. [PMID: 33792824 DOI: 10.1007/s11064-021-03313-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 03/01/2021] [Accepted: 03/24/2021] [Indexed: 10/21/2022]
Abstract
Interleukin-2 (IL-2) is a classical pro-inflammatory cytokine known to display neuroprotective roles in the central nervous system including the retina. In the present study, we investigate the molecular targets involved in the neurotrophic effect of IL-2 on retinal ganglion cells (RGC) after optic nerve axotomy. Analysis of retrograde labeling of RGC showed that common cell survival mediators, as Trk receptors, Src, PI3K, PKC, and intracellular calcium do not mediate the neurotrophic effect of IL-2 on RGC. No involvement of MAPK p38 was also observed. However, other MAPKs as MEK and JNK appear to be mediating this IL-2 effect. Our data also indicate that JAK2/3 are important intracellular proteins for the IL-2 effect. Interestingly, we demonstrate that the IL-2 effect depends on dopamine D1 receptors (D1R), the cAMP/PKA pathway, interleukin-10 (IL-10), and NF-κB, suggesting that RGC survival induced by IL-2 encompasses a molecular network of major complexity. In addition, treatment of retinal cells with recombinant IL-10 or 6-Cl-pb (D1R full agonist) was able to increase RGC survival similar to IL-2. Taken together, our results suggest that after optic nerve axotomy, the increase in RGC survival triggered by IL-2 is mediated by IL-10 and D1R along with the intracellular pathways of MAPKs, JAK/STAT, and cAMP/PKA.
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Nepal N, Arthur S, Haynes J, Palaniappan B, Sundaram U. Mechanism of Na-K-ATPase Inhibition by PGE2 in Intestinal Epithelial Cells. Cells 2021; 10:cells10040752. [PMID: 33805551 PMCID: PMC8066871 DOI: 10.3390/cells10040752] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 03/23/2021] [Accepted: 03/26/2021] [Indexed: 11/26/2022] Open
Abstract
The primary means of intestinal absorption of nutrients by villus cells is via Na-dependent nutrient co-transporters located in the brush border membrane (BBM). These secondary active co-transport processes require a favorable transcellular Na gradient that is provided by Na-K-ATPase. In chronic enteritis, malabsorption of essential nutrients is partially due to inhibition of villus Na-K-ATPase activity mediated by specific immune inflammatory mediators that are known to be elevated in the inflamed mucosa. However, how Prostaglandin E2 (PGE2), a specific mediator of nutrient malabsorption in the villus BBM, may mediate the inhibition of Na-K-ATPase is not known. Therefore, this study aimed to determine the effect of PGE2 on Na-K-ATPase in villus cells and define its mechanism of action. In vitro, in IEC-18 cells, PGE2 treatment significantly reduced Na-K-ATPase activity, accompanied by a significant increase in the intracellular levels of cyclic Adenosine Monophosphate (cAMP). The treatment with cAMP analog 8-Bromo-cAMP mimicked the PGE2-mediated effect on Na-K-ATPase activity, while Rp-cAMP (PKA inhibitor) pretreatment reversed the same. The mechanism of inhibition of PGE2 was secondary to a transcriptional reduction in the Na-K-ATPase α1 and β1 subunit genes, which was reversed by the Rp-cAMP pretreatment. Thus, the PGE2-mediated activation of the PKA pathway mediates the transcriptional inhibition of Na-K-ATPase activity in vitro.
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Salvator H, Buenestado A, Brollo M, Naline E, Victoni T, Longchamp E, Tenor H, Grassin-Delyle S, Devillier P. Clinical Relevance of the Anti-inflammatory Effects of Roflumilast on Human Bronchus: Potentiation by a Long-Acting Beta-2-Agonist. Front Pharmacol 2020; 11:598702. [PMID: 33363471 PMCID: PMC7754640 DOI: 10.3389/fphar.2020.598702] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 10/30/2020] [Indexed: 11/24/2022] Open
Abstract
Background: Roflumilast is an option for treating patients with severe COPD and frequent exacerbations despite optimal therapy with inhaled drugs. The present study focused on whether the phosphodiesterase (PDE) 4 inhibitor roflumilast and its active metabolite roflumilast N-oxide affect the release of tumor necrosis factor (TNF)-α and chemokines by lipopolysaccharide (LPS)-stimulated human bronchial explants. We also investigated the interactions between roflumilast, roflumilast N-oxide and the β2-agonist formoterol with regard to cytokine release by the bronchial preparations. Methods: Bronchial explants from resected lungs were incubated with roflumilast, roflumilast N-oxide and/or formoterol and then stimulated with LPS. An ELISA was used to measure levels of TNF-α and chemokines in the culture supernatants. Results: At a clinically relevant concentration (1 nM), roflumilast N-oxide and roflumilast consistently reduced the release of TNF-α, CCL2, CCL3, CCL4, CCL5 and CXCL9 (but not CXCL1, CXCL5, CXCL8 and IL-6) from human bronchial explants. Formoterol alone decreased the release of TNF-α, CCL2, and CCL3. The combination of formoterol with roflumilast (1 nM) was more potent than roflumilast alone for inhibiting the LPS-induced release of TNF-α, CCL2, CCL3, CCL4, and CXCL9 by the bronchial explants. Conclusions: At a clinically relevant concentration, roflumilast N-oxide and its parent compound, roflumilast, reduced the LPS-induced production of TNF-α and chemokines involved in monocyte and T-cell recruitment but did not alter the release of chemokines involved in neutrophil recruitment. The combination of formoterol with roflumilast enhanced the individual drugs’ anti-inflammatory effects.
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Affiliation(s)
- Hélène Salvator
- Laboratory of Research in Respiratory Pharmacology, V2I - UMR-0092, Université Paris Saclay, Suresnes, France.,Department of Airway Diseases, Hôpital Foch, Suresnes, France
| | - Amparo Buenestado
- Laboratory of Research in Respiratory Pharmacology, V2I - UMR-0092, Université Paris Saclay, Suresnes, France
| | - Marion Brollo
- Laboratory of Research in Respiratory Pharmacology, V2I - UMR-0092, Université Paris Saclay, Suresnes, France
| | - Emmanuel Naline
- Laboratory of Research in Respiratory Pharmacology, V2I - UMR-0092, Université Paris Saclay, Suresnes, France.,Department of Airway Diseases, Hôpital Foch, Suresnes, France
| | - Tatiana Victoni
- Laboratory of Research in Respiratory Pharmacology, V2I - UMR-0092, Université Paris Saclay, Suresnes, France
| | | | | | - Stanislas Grassin-Delyle
- Department of Airway Diseases, Hôpital Foch, Suresnes, France.,INSERM U1173, Infection and Inflammation, Département de Biotechnologie de la Santé, Université Paris-Saclay, Montigny-le-Bretonneux, France
| | - Philippe Devillier
- Laboratory of Research in Respiratory Pharmacology, V2I - UMR-0092, Université Paris Saclay, Suresnes, France.,Department of Airway Diseases, Hôpital Foch, Suresnes, France
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11
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Jannaway M, Yang X, Meegan JE, Coleman DC, Yuan SY. Thrombin-cleaved syndecan-3/-4 ectodomain fragments mediate endothelial barrier dysfunction. PLoS One 2019; 14:e0214737. [PMID: 31091226 PMCID: PMC6519803 DOI: 10.1371/journal.pone.0214737] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 03/19/2019] [Indexed: 01/25/2023] Open
Abstract
Objective The endothelial glycocalyx constitutes part of the endothelial barrier but its degradation leaves endothelial cells exposed to transmigrating cells and circulating mediators that can damage the barrier or promote intercellular gaps. Syndecan proteins are key components of the endothelial glycocalyx and are shed during disease states where expression and activity of proteases such as thrombin are elevated. We tested the ability of thrombin to cleave the ectodomains of syndecans and whether the products could act directly on endothelial cells to alter barrier function. Approach and results Using transmission electron microscopy, we illustrated the presence of glycocalyx in human lung microvasculature. We confirmed expression of all syndecan subtypes on the endothelial surface of agarose-inflated human lungs. ELISA and western blot analysis suggested that thrombin can cleave syndecan-3/-4 ectodomains to produce fragments. In vivo, syndecan-3 ectodomain fragments increased extravasation of albumin-bound Evans blue in mouse lung, indicative of plasma protein leakage into the surrounding tissue. Syndecan-3/-4 ectodomain fragments decreased transendothelial electrical resistance, a measure of cell-cell adhesive barrier integrity, in a manner sensitive to a Rho kinase inhibitor. These effects were independent of glycosylation and thrombin receptor PAR1. Moreover, these cleavage products caused rapid VE-cadherin-based adherens junction disorganization and increased F-actin stress fibers, supporting their direct effect on endothelial paracellular permeability. Conclusions We suggest that thrombin can cleave syndecan-3/4 ectodomain into fragments which interact with endothelial cells causing paracellular hyperpermeability. This may have important implications in the pathogenesis of vascular dysfunction during sepsis or thrombotic disease states where thrombin is activated.
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Affiliation(s)
- Melanie Jannaway
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
| | - Xiaoyuan Yang
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
| | - Jamie E. Meegan
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
| | - Danielle C. Coleman
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
| | - Sarah Y. Yuan
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
- Department of Surgery, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
- * E-mail:
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12
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Held F, Hoppe E, Cvijovic M, Jirstrand M, Gabrielsson J. Challenge model of TNF α turnover at varying LPS and drug provocations. J Pharmacokinet Pharmacodyn 2019; 46:223-240. [PMID: 30778719 PMCID: PMC6529397 DOI: 10.1007/s10928-019-09622-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 02/08/2019] [Indexed: 11/28/2022]
Abstract
A mechanism-based biomarker model of TNFα-response, including different external provocations of LPS challenge and test compound intervention, was developed. The model contained system properties (such as kt, kout), challenge characteristics (such as ks, kLPS, Km, LPS, Smax, SC50) and test-compound-related parameters (Imax, IC50). The exposure to test compound was modelled by means of first-order input and Michaelis–Menten type of nonlinear elimination. Test compound potency was estimated to 20 nM with a 70% partial reduction in TNFα-response at the highest dose of 30 mg·kg−1. Future selection of drug candidates may focus the estimation on potency and efficacy by applying the selected structure consisting of TNFα system and LPS challenge characteristics. A related aim was to demonstrate how an exploratory (graphical) analysis may guide us to a tentative model structure, which enables us to better understand target biology. The analysis demonstrated how to tackle a biomarker with a baseline below the limit of detection. Repeated LPS-challenges may also reveal how the rate and extent of replenishment of TNFα pools occur. Lack of LPS exposure-time courses was solved by including a biophase model, with the underlying assumption that TNFα-response time courses, as such, contain kinetic information. A transduction type of model with non-linear stimulation of TNFα release was finally selected. Typical features of a challenge experiment were shown by means of model simulations. Experimental shortcomings of present and published designs are identified and discussed. The final model coupled to suggested guidance rules may serve as a general basis for the collection and analysis of pharmacological challenge data of future studies.
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Affiliation(s)
- Felix Held
- Fraunhofer-Chalmers Centre, Chalmers Science Park, Gothenburg, Sweden. .,Department of Mathematical Sciences, Chalmers University of Technology and University of Gothenburg, Gothenburg, Sweden.
| | | | - Marija Cvijovic
- Department of Mathematical Sciences, Chalmers University of Technology and University of Gothenburg, Gothenburg, Sweden
| | - Mats Jirstrand
- Fraunhofer-Chalmers Centre, Chalmers Science Park, Gothenburg, Sweden
| | - Johan Gabrielsson
- Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Box 7028, 75007, Uppsala, Sweden
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Bhat SM, Massey N, Karriker LA, Singh B, Charavaryamath C. Ethyl pyruvate reduces organic dust-induced airway inflammation by targeting HMGB1-RAGE signaling. Respir Res 2019; 20:27. [PMID: 30728013 PMCID: PMC6364446 DOI: 10.1186/s12931-019-0992-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 01/27/2019] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Animal production workers are persistently exposed to organic dust and can suffer from a variety of respiratory disease symptoms and annual decline in lung function. The role of high mobility group box-1 (HMGB1) in inflammatory airway diseases is emerging. Hence, we tested a hypothesis that organic dust exposure of airway epithelial cells induces nucleocytoplasmic translocation of HMGB1 and blocking this translocation dampens organic dust-induced lung inflammation. METHODS Rats were exposed to either ambient air or swine barn (8 h/day for either 1, 5, or 20 days) and lung tissues were processed for immunohistochemistry. Swine barn dust was collected and organic dust extract (ODE) was prepared and sterilized. Human airway epithelial cell line (BEAS-2B) was exposed to either media or organic dust extract followed by treatment with media or ethyl pyruvate (EP) or anti-HMGB1 antibody. Immunoblotting, ELISA and other assays were performed at 0 (control), 6, 24 and 48 h. Data (as mean ± SEM) was analyzed using one or two-way ANOVA followed by Bonferroni's post hoc comparison test. A p value of less than 0.05 was considered significant. RESULTS Compared to controls, barn exposed rats showed an increase in the expression of HMGB1 in the lungs. Compared to controls, ODE exposed BEAS-2B cells showed nucleocytoplasmic translocation of HMGB1, co-localization of HMGB1 and RAGE, reactive species and pro-inflammatory cytokine production. EP treatment reduced the ODE induced nucleocytoplasmic translocation of HMGB1, HMGB1 expression in the cytoplasmic fraction, GM-CSF and IL-1β production and augmented the production of TGF-β1 and IL-10. Anti-HMGB1 treatment reduced ODE-induced NF-κB p65 expression, IL-6, ROS and RNS but augmented TGF-β1 and IL-10 levels. CONCLUSIONS HMGB1-RAGE signaling is an attractive target to abrogate OD-induced lung inflammation.
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Affiliation(s)
- Sanjana Mahadev Bhat
- Department of Biomedical Sciences, 2008 Vet Med Building, Iowa State University, Ames, IA, USA
| | - Nyzil Massey
- Department of Biomedical Sciences, 2008 Vet Med Building, Iowa State University, Ames, IA, USA
| | - Locke A Karriker
- Department of Veterinary Diagnostic and Production Animal Medicine, 2203 Lloyd Veterinary Medical Center, Iowa State university, Ames, IA, USA
| | - Baljit Singh
- Faculty of Veterinary Medicine, 2500 University Dr. NW, University of Calgary, Calgary, T2N 1N4, Canada
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14
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Dickinson JD, Sweeter JM, Staab EB, Nelson AJ, Bailey KL, Warren KJ, Jaramillo AM, Dickey BF, Poole JA. MyD88 controls airway epithelial Muc5ac expression during TLR activation conditions from agricultural organic dust exposure. Am J Physiol Lung Cell Mol Physiol 2019; 316:L334-L347. [PMID: 30358438 PMCID: PMC6397350 DOI: 10.1152/ajplung.00206.2018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 10/19/2018] [Accepted: 10/21/2018] [Indexed: 02/04/2023] Open
Abstract
Inflammation from airborne microbes can overwhelm compensatory mucociliary clearance mechanisms, leading to mucous cell metaplasia. Toll-like receptor (TLR) activation via myeloid differentiation factor 88 (MyD88) signaling is central to pathogen responses. We have previously shown that agricultural organic dust extract (ODE), with abundant microbial component diversity, activates TLR-induced airway inflammation. With the use of an established model, C57BL/6J wild-type (WT) and global MyD88 knockout (KO) mice were treated with intranasal inhalation of ODE or saline, daily for 1 wk. ODE primarily increased mucin (Muc)5ac levels relative to Muc5b. Compared with ODE-challenged WT mice, ODE-challenged, MyD88-deficient mice demonstrated significantly increased Muc5ac immunostaining, protein levels by immunoblot, and expression by quantitative PCR. The enhanced Muc5ac levels in MyD88-deficient mice were not explained by differences in the differentiation program of airway secretory cells in naïve mice. Increased Muc5ac levels in MyD88-deficient mice were also not explained by augmented inflammation, IL-17A, or neutrophil elastase levels. Furthermore, the enhanced airway mucins in the MyD88-deficient mice were not due to defective secretion, as the mucin secretory capacity of MyD88-KO mice remained intact. Finally, ODE-induced Muc5ac levels were enhanced in MyD88-deficient airway epithelial cells in vitro. In conclusion, MyD88 deficiency enhances airway mucous cell metaplasia under environments with high TLR activation.
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Affiliation(s)
- John D Dickinson
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Jenea M Sweeter
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Elizabeth B Staab
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Amy J Nelson
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Kristina L Bailey
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Kristi J Warren
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Ana Maria Jaramillo
- Department of Pulmonary Medicine, MD Anderson Cancer Center , Houston, Texas
| | - Burton F Dickey
- Department of Pulmonary Medicine, MD Anderson Cancer Center , Houston, Texas
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
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15
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Nath Neerukonda S, Mahadev-Bhat S, Aylward B, Johnson C, Charavaryamath C, Arsenault RJ. Kinome analyses of inflammatory responses to swine barn dust extract in human bronchial epithelial and monocyte cell lines. Innate Immun 2018; 24:366-381. [PMID: 30092684 PMCID: PMC6830909 DOI: 10.1177/1753425918792070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Exacerbated inflammation upon persistent barn organic dust exposure is a key
contributor to the pathogenesis of lung inflammation and lung function decline.
Barn dust constituents and the mechanisms contributing to the exacerbated
inflammation are not clearly known. We set out to understand the inflammatory
effects of Swine Barn Dust Extracts (SBDE) on human lung epithelial (BEAS2B) and
macrophage (THP-1 monocyte derived) cell lines on a kinome array to determine
phosphorylation events in the inflammatory signaling pathways. Upon identifying
events unique to SBDE or those induced by innate immune ligands in each cell
line, we validated the signaling pathway activation by transcriptional analyses
of downstream inflammatory cytokines. Our findings indicate that SBDE-mediated
pro-inflammatory effects are predominantly due to the induction of neutrophilic
chemokine IL-8. Differentially phosphorylated peptides implicated in IL-8
induction in BEAS2B cell line include, TLR2, 4, 5, 7, 8, 9, PKC, MAP kinases
(p38, JNK), inflammasomes (NLRP1, NLRP3), NF-κB and AP-1. In the THP-1 cell
line, in addition to the aforementioned peptides, peptides corresponding to
RIG-I-like receptors (RIG-I, MDA5) were found. This is the first report to
demonstrate the application of a kinome array to delineate key inflammatory
signaling pathways activated upon SBDE exposure in vitro.
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Affiliation(s)
| | - Sanjana Mahadev-Bhat
- 2 Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, USA
| | - Bridget Aylward
- 1 Department of Animal and Food Sciences, University of Delaware, USA
| | - Casey Johnson
- 1 Department of Animal and Food Sciences, University of Delaware, USA
| | | | - Ryan J Arsenault
- 1 Department of Animal and Food Sciences, University of Delaware, USA
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16
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Chandra D, Poole JA, Bailey KL, Staab E, Sweeter JM, DeVasure JM, Romberger DJ, Wyatt TA. Dimethylarginine dimethylaminohydrolase (DDAH) overexpression enhances wound repair in airway epithelial cells exposed to agricultural organic dust. Inhal Toxicol 2018; 30:133-139. [PMID: 29793367 DOI: 10.1080/08958378.2018.1474976] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
OBJECTIVE Workers exposed to dusts from concentrated animal feeding operations have a high prevalence of pulmonary diseases. These exposures lead to chronic inflammation and aberrant airway remodeling. Previous work shows that activating cAMP-dependent protein kinase (PKA) enhances airway epithelial wound repair while activating protein kinase C (PKC) inhibits wound repair. Hog barn dust extracts slow cell migration and wound repair via a PKC-dependent mechanism. Further, blocking nitric oxide (NO) production in bronchial epithelial cells prevents PKA activation. We hypothesized that blocking an endogenous NO inhibitor, asymmetric dimethylarginine, by overexpressing dimethylarginine dimethylaminohydrolase mitigates the effects of hog dust extract on airway epithelial would repair. MATERIALS/METHODS We cultured primary tracheal epithelial cells in monolayers from both wild-type (WT) and dimethylarginine dimethylaminohydrolase overexpressing C57Bl/6 (DDAH1 transgenic) mice and measured wound repair using the electric cell impedance sensing system. RESULTS Wound closure in epithelial cells from WT mice occurred within 24 h in vitro. In contrast, treatment of the WT cell monolayers with 5% hog dust extract prevented significant NO-stimulated wound closure. In cells from DDAH1 transgenic mice, control wounds were repaired up to 8 h earlier than seen in WT mice. A significant enhancement of wound repair was observed in DDAH cells compared to WT cells treated with hog dust extract for 24 h. Likewise, cells from DDAH1 transgenic mice demonstrated increased NO and PKA activity and decreased hog dust extract-stimulated PKC. DISCUSSION/CONCLUSION Preserving the NO signal through endogenous inhibition of asymmetric dimethylarginine enhances wound repair even in the presence of dust exposure.
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Affiliation(s)
- Deepak Chandra
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Jill A Poole
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Kristina L Bailey
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas.,b Research Service, Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha , NE Douglas
| | - Elizabeth Staab
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Jenea M Sweeter
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Jane M DeVasure
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Debra J Romberger
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas.,b Research Service, Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha , NE Douglas
| | - Todd A Wyatt
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas.,b Research Service, Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha , NE Douglas.,c Department of Environmental, Agricultural and Occupational Health , University of Nebraska Medical Center , Omaha , NE Douglas
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17
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Laudette M, Zuo H, Lezoualc'h F, Schmidt M. Epac Function and cAMP Scaffolds in the Heart and Lung. J Cardiovasc Dev Dis 2018; 5:jcdd5010009. [PMID: 29401660 PMCID: PMC5872357 DOI: 10.3390/jcdd5010009] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 01/25/2018] [Accepted: 01/29/2018] [Indexed: 12/13/2022] Open
Abstract
Evidence collected over the last ten years indicates that Epac and cAMP scaffold proteins play a critical role in integrating and transducing multiple signaling pathways at the basis of cardiac and lung physiopathology. Some of the deleterious effects of Epac, such as cardiomyocyte hypertrophy and arrhythmia, initially described in vitro, have been confirmed in genetically modified mice for Epac1 and Epac2. Similar recent findings have been collected in the lung. The following sections will describe how Epac and cAMP signalosomes in different subcellular compartments may contribute to cardiac and lung diseases.
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Affiliation(s)
- Marion Laudette
- Inserm UMR-1048, Institut des Maladies Métaboliques et Cardiovasculaires, Université Toulouse III, 31432 Toulouse, France.
| | - Haoxiao Zuo
- Department of Molecular Pharmacology, University of Groningen, 9713AV Groningen, The Netherlands.
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, 9713AV Groningen, The Netherlands.
| | - Frank Lezoualc'h
- Inserm UMR-1048, Institut des Maladies Métaboliques et Cardiovasculaires, Université Toulouse III, 31432 Toulouse, France.
| | - Martina Schmidt
- Department of Molecular Pharmacology, University of Groningen, 9713AV Groningen, The Netherlands.
- Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, 9713AV Groningen, The Netherlands.
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18
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Nordgren TM, Heires AJ, Bailey KL, Katafiasz DM, Toews ML, Wichman CS, Romberger DJ. Docosahexaenoic acid enhances amphiregulin-mediated bronchial epithelial cell repair processes following organic dust exposure. Am J Physiol Lung Cell Mol Physiol 2017; 314:L421-L431. [PMID: 29097425 DOI: 10.1152/ajplung.00273.2017] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Injurious dust exposures in the agricultural workplace involve the release of inflammatory mediators and activation of epidermal growth factor receptor (EGFR) in the respiratory epithelium. Amphiregulin (AREG), an EGFR ligand, mediates tissue repair and wound healing in the lung epithelium. Omega-3 fatty acids such as docosahexaenoic acid (DHA) are also known modulators of repair and resolution of inflammatory injury. This study investigated how AREG, DHA, and EGFR modulate lung repair processes following dust-induced injury. Primary human bronchial epithelial (BEC) and BEAS-2B cells were treated with an aqueous extract of swine confinement facility dust (DE) in the presence of DHA and AREG or EGFR inhibitors. Mice were exposed to DE intranasally with or without EGFR inhibition and DHA. Using a decellularized lung scaffolding tissue repair model, BEC recolonization of human lung scaffolds was analyzed in the context of DE, DHA, and AREG treatments. Through these investigations, we identified an important role for AREG in mediating BEC repair processes. DE-induced AREG release from BEC, and DHA treatment following DE exposure, enhanced this release. Both DHA and AREG also enhanced BEC repair capacities and rescued DE-induced recellularization deficits. In vivo, DHA treatment enhanced AREG production following DE exposure, whereas EGFR inhibitor-treated mice exhibited reduced AREG in their lung homogenates. These data indicate a role for AREG in the process of tissue repair after inflammatory lung injury caused by environmental dust exposure and implicate a role for DHA in regulating AREG-mediated repair signaling in BEC.
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Affiliation(s)
- Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska.,Division of Biomedical Sciences, School of Medicine, University of California Riverside , Riverside, California
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Kristina L Bailey
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska.,Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Dawn M Katafiasz
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Myron L Toews
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center , Omaha, Nebraska
| | - Christopher S Wichman
- Department of Biostatistics, University of Nebraska Medical Center , Omaha, Nebraska
| | - Debra J Romberger
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska.,Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
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Insuela DBR, Carvalho VF. Glucagon and glucagon-like peptide-1 as novel anti-inflammatory and immunomodulatory compounds. Eur J Pharmacol 2017; 812:64-72. [PMID: 28688914 DOI: 10.1016/j.ejphar.2017.07.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 07/04/2017] [Accepted: 07/05/2017] [Indexed: 12/25/2022]
Abstract
Glucagon and glucagon-like peptide-1 (GLP-1) are polypeptide hormones that are produced by pancreatic α-cells and the intestine, respectively, whose main function is to control glucose homeostasis. The glucagon and GLP-1 levels are imbalanced in diabetes. Furthermore, type 1 diabetic patients and animals present with a diminished inflammatory response, which is related to some morbidities of diabetes, such as a higher incidence of infectious diseases, including sepsis. The focus of this review is to briefly summarize the state of the art concerning the effects of glucagon and GLP-1 on the inflammatory response. Here, we propose that glucagon and GLP-1 have anti-inflammatory properties, making them possible prototypes for the design and synthesis of new compounds to treat inflammatory diseases. In addition, glucagon, GLP-1 or their analogues or new derivatives may not only be important for managing inflammatory diseases but may also have the therapeutic potential to prevent, cure or ameliorate diabetes in patients by counteracting the deleterious effects of pro-inflammatory cytokines on the function and viability of pancreatic β-cells. In addition, GLP-1, its analogues or drugs that inhibit GLP-1 metabolism may have a doubly beneficial effect in diabetic patients by inhibiting the inflammatory response and reducing glycaemia.
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Affiliation(s)
- Daniella B R Insuela
- Laboratório de Inflamação, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil, n°4365, Manguinhos, CEP 21040-360 Rio de Janeiro, Brazil
| | - Vinicius F Carvalho
- Laboratório de Inflamação, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil, n°4365, Manguinhos, CEP 21040-360 Rio de Janeiro, Brazil; National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM), Brazil.
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Wyatt TA, Canady K, Heires AJ, Poole JA, Bailey KL, Nordgren TM, Romberger DJ. Alcohol Inhibits Organic Dust-induced ICAM-1 Expression on Bronchial Epithelial Cells. Safety (Basel) 2017; 3:5. [PMID: 29082234 PMCID: PMC5658133 DOI: 10.3390/safety3010005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
UNLABELLED Aims: Exposure to dusts/bioaerosols in concentrated animal feeding operations (CAFOs) results in inflammatory lung diseases in workers. Hog CAFOs dust extract (HDE) increases expression of intercellular adhesion molecule-1 (ICAM-1), neutrophil adhesion, and TNFα release in bronchial epithelial cells. Alcohol consumption is increasingly recognized to impair lung immunity. We hypothesized that alcohol impairs HDE-induced TNFα, ICAM-1 expression and neutrophil adhesion by directly inhibiting TNFα converting enzyme (TACE) activity. METHODS Bronchial epithelial cells (BEAS-2B) and primary human bronchial epithelial cells were pretreated with ethanol (EtOH) or TACE inhibitor. ICAM-1 surface expression, TNFα release, and TACE activity were analyzed following HDE stimulation. The effect of alcohol and TACE inhibition on HDE-regulated epithelial cell/neutrophil adhesion interactions was investigated. Finally, utilizing an established animal model, C57BL/6 mice were fed ad libitum ethanol (20%) in drinking water for 8 wk followed by daily intranasal inhalation of HDE or saline during the final two weeks. Mice were sacrificed and lung sections immunostained for ICAM-1. RESULTS Pretreatment with alcohol or TACE inhibitor significantly decreased HDE-induced ICAM-1 expression and TNFα release. HDE augmented neutrophil adhesion to epithelial cells, which was decreased with alcohol (32% decrease) or TACE inhibitor (55% decrease) pretreatment. TACE activity increased following HDE exposure, but TACE activity was inhibited following alcohol pretreatment. Alcohol-fed mice demonstrated decreased HDE-induced airway epithelium ICAM-1 expression. CONCLUSIONS Alcohol diminishes HDE-induced ICAM-1 expression, TNFα release, and neutrophil adhesion via inhibition of TACE activity. These results suggest that alcohol may be an important modulator of lung innate immune responses following CAFO exposure.
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Affiliation(s)
- Todd A. Wyatt
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
- Department of Environmental, Agricultural, & Occupational Health, University of Nebraska Medical Center, Omaha, NE, 68198-5910
- Resereach Service, VA Omaha-Western Iowa Health Care System, Omaha, NE, 68105
| | - Kerry Canady
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Art J. Heires
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Jill A. Poole
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Kristina L. Bailey
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
- Resereach Service, VA Omaha-Western Iowa Health Care System, Omaha, NE, 68105
| | - Tara M. Nordgren
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Debra J. Romberger
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
- Resereach Service, VA Omaha-Western Iowa Health Care System, Omaha, NE, 68105
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Gerald CL, Romberger DJ, DeVasure JM, Khazanchi R, Nordgren TM, Heires AJ, Sisson JH, Wyatt TA. Alcohol Decreases Organic Dust-Stimulated Airway Epithelial TNF-Alpha Through a Nitric Oxide and Protein Kinase-Mediated Inhibition of TACE. Alcohol Clin Exp Res 2016; 40:273-83. [PMID: 26842246 DOI: 10.1111/acer.12967] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 11/18/2015] [Indexed: 12/24/2022]
Abstract
BACKGROUND Farm workers in rural areas consume more alcohol than those who reside in urban areas. Occupational exposures such as agricultural work can pose hazards on the respiratory system. It is established that hog barn dust induces inflammation in the airway, including the release of cytokines such as tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), and IL-8. We have shown that alcohol alters airway epithelial innate defense through changes in both nitric oxide (NO) and cAMP-dependent protein kinase A (PKA). Simultaneous exposure to hog barn dust and alcohol decreases inflammatory mediators, TNF-α, IL-6, and IL-8, in mice. Previously, mice exposed to both alcohol and hog barn dust showed a depleted amount of lymphocytes compared to mice exposed only to hog barn dust. Weakening of the innate immune response could lead to enhanced susceptibility to disease. In addition, mice that were co-exposed to hog barn dust and alcohol also experienced increased mortality. METHODS Because we recently demonstrated that PKA activation inhibits the TNF-α sheddase, TNF-α-converting enzyme (TACE), we hypothesized that an alcohol-mediated PKA pathway blocks TACE activity and prevents the normative inflammatory response to hog barn dust exposure. To delineate these effects, we used PKA pathway inhibitors (adenylyl cyclase [AC], cAMP, and PKA) to modulate the effects of alcohol on dust-stimulated TNF-α release in the bronchial epithelial cell line, BEAS-2B. Alcohol pretreatment blocked TACE activity and TNF-α release in hog barn dust-treated cells. RESULTS Alcohol continued to block hog barn dust-mediated TNF-α release in the presence of the particulate AC inhibitor, SQ22,536. The soluble adenylyl cyclase inhibitor, KH7, however, significantly increased the inflammatory response to hog barn dust. phosphodiesterase 4 inhibitors significantly elevated cAMP and enhanced alcohol-mediated inhibition of dust-stimulated TNF-α release. In addition, the NO synthase inhibitor, l-NMMA, also reversed the alcohol-blocking effect on dust-stimulated TNF-α. CONCLUSIONS These data suggest that alcohol requires a soluble cyclase-generated cAMP-PKA pathway that is dependent upon the action of NO to inhibit TACE and TNF-α release. These findings support our observations that alcohol functions through a dual NO and PKA pathway in bronchial epithelial cells.
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Affiliation(s)
- Carresse L Gerald
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska.,Department of Veterans Affairs Medical Center, VA Nebraska-Western Iowa Health Care System Research Service, Omaha, Nebraska
| | - Jane M DeVasure
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Rohan Khazanchi
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Art J Heires
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Joseph H Sisson
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Todd A Wyatt
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska.,Department of Veterans Affairs Medical Center, VA Nebraska-Western Iowa Health Care System Research Service, Omaha, Nebraska.,Department of Environmental, Agricultural, and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska
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22
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Romberger DJ, Heires AJ, Nordgren TM, Poole JA, Toews ML, West WW, Wyatt TA. β2-Adrenergic agonists attenuate organic dust-induced lung inflammation. Am J Physiol Lung Cell Mol Physiol 2016; 311:L101-10. [PMID: 27190062 DOI: 10.1152/ajplung.00125.2016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 05/17/2016] [Indexed: 01/05/2023] Open
Abstract
Agricultural dust exposure results in significant lung inflammation, and individuals working in concentrated animal feeding operations (CAFOs) are at risk for chronic airway inflammatory diseases. Exposure of bronchial epithelial cells to aqueous extracts of hog CAFO dusts (HDE) leads to inflammatory cytokine production that is driven by protein kinase C (PKC) activation. cAMP-dependent protein kinase (PKA)-activating agents can inhibit PKC activation in epithelial cells, leading to reduced inflammatory cytokine production following HDE exposure. β2-Adrenergic receptor agonists (β2-agonists) activate PKA, and we hypothesized that β2-agonists would beneficially impact HDE-induced adverse airway inflammatory consequences. Bronchial epithelial cells were cultured with the short-acting β2-agonist salbutamol or the long-acting β2-agonist salmeterol prior to stimulation with HDE. β2-Agonist treatment significantly increased PKA activation and significantly decreased HDE-stimulated IL-6 and IL-8 production in a concentration- and time-dependent manner. Salbutamol treatment significantly reduced HDE-induced intracellular adhesion molecule-1 expression and neutrophil adhesion to epithelial cells. Using an established intranasal inhalation exposure model, we found that salbutamol pretreatment reduced airway neutrophil influx and IL-6, TNF-α, CXCL1, and CXCL2 release in bronchoalveolar lavage fluid following a one-time exposure to HDE. Likewise, when mice were pretreated daily with salbutamol prior to HDE exposure for 3 wk, HDE-induced neutrophil influx and inflammatory mediator production were also reduced. The severity of HDE-induced lung pathology in mice repetitively exposed to HDE for 3 wk was also decreased with daily salbutamol pretreatment. Together, these results support the need for future clinical investigations to evaluate the utility of β2-agonist therapies in the treatment of airway inflammation associated with CAFO dust exposure.
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Affiliation(s)
- Debra J Romberger
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska; Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska;
| | - Art J Heires
- Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Myron L Toews
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, Nebraska
| | - William W West
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska; and
| | - Todd A Wyatt
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska; Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska; Department of Environmental, Agricultural, and Occupational Health, University of Nebraska Medical Center, Omaha, Nebraska
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23
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Poole JA, Wyatt TA, Romberger DJ, Staab E, Simet S, Reynolds SJ, Sisson JH, Kielian T. MyD88 in lung resident cells governs airway inflammatory and pulmonary function responses to organic dust treatment. Respir Res 2015; 16:111. [PMID: 26376975 PMCID: PMC4574163 DOI: 10.1186/s12931-015-0272-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 09/03/2015] [Indexed: 11/10/2022] Open
Abstract
Inhalation of organic dusts within agriculture environments contributes to the development and/or severity of airway diseases, including asthma and chronic bronchitis. MyD88 KO (knockout) mice are nearly completely protected against the inflammatory and bronchoconstriction effects induced by acute organic dust extract (ODE) treatments. However, the contribution of MyD88 in lung epithelial cell responses remains unclear. In the present study, we first addressed whether ODE-induced changes in epithelial cell responses were MyD88-dependent by quantitating ciliary beat frequency and cell migration following wounding by electric cell-substrate impedance sensing. We demonstrate that the normative ciliary beat slowing response to ODE is delayed in MyD88 KO tracheal epithelial cells as compared to wild type (WT) control. Similarly, the normative ODE-induced slowing of cell migration in response to wound repair was aberrant in MyD88 KO cells. Next, we created MyD88 bone marrow chimera mice to investigate the relative contribution of MyD88-dependent signaling in lung resident (predominately epithelial cells) versus hematopoietic cells. Importantly, we demonstrate that ODE-induced airway hyperresponsiveness is MyD88-dependent in lung resident cells, whereas MyD88 action in hematopoietic cells is mainly responsible for ODE-induced TNF-α release. MyD88 signaling in lung resident and hematopoietic cells are necessary for ODE-induced IL-6 and neutrophil chemoattractant (CXCL1 and CXCL2) release and neutrophil influx. Collectively, these findings underscore an important role for MyD88 in lung resident cells for regulating ciliary motility, wound repair and inflammatory responses to ODE, and moreover, show that airway hyperresponsiveness appears uncoupled from airway inflammatory consequences to organic dust challenge in terms of MyD88 involvement.
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Affiliation(s)
- Jill A Poole
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA.
| | - Todd A Wyatt
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA.,Department of Environmental, Agricultural & Occupational Health, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA.,VA Nebraska-Western Iowa Health Care System, Omaha, NE, 68105, USA
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA.,Department of Environmental, Agricultural & Occupational Health, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA
| | - Elizabeth Staab
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA
| | - Samantha Simet
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA
| | - Stephen J Reynolds
- High Plains Intermountain Center for Agricultural Health and Safety, Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, CO, USA
| | - Joseph H Sisson
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA
| | - Tammy Kielian
- Department of Pathology and Microbiology, University of Nebraska Medical Center, 985990 Nebraska Medical Center, Omaha, NE, 68198-5990, USA
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Romberger DJ, Heires AJ, Nordgren TM, Souder CP, West W, Liu XD, Poole JA, Toews ML, Wyatt TA. Proteases in agricultural dust induce lung inflammation through PAR-1 and PAR-2 activation. Am J Physiol Lung Cell Mol Physiol 2015; 309:L388-99. [PMID: 26092994 DOI: 10.1152/ajplung.00025.2015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 06/09/2015] [Indexed: 01/31/2023] Open
Abstract
Workers exposed to aerosolized dust present in concentrated animal feeding operations (CAFOs) are susceptible to inflammatory lung diseases, such as chronic obstructive pulmonary disease. Extracts of dust collected from hog CAFOs [hog dust extract (HDE)] are potent stimulators of lung inflammatory responses in several model systems. The observation that HDE contains active proteases prompted the present study, which evaluated the role of CAFO dust proteases in lung inflammatory processes and tested whether protease-activated receptors (PARs) are involved in the signaling pathway for these events. We hypothesized that the damaging proinflammatory effect of HDE is due, in part, to the proteolytic activation of PARs, and inhibiting the proteases in HDE or disrupting PAR activation would attenuate HDE-mediated inflammatory indexes in bronchial epithelial cells (BECs), in mouse lung slices in vitro, and in a murine in vivo exposure model. Human BECs and mouse lung slice cultures stimulated with 5% HDE released significantly more of each of the cytokines measured (IL-6, IL-8, TNF-α, keratinocyte-derived chemokine/CXC chemokine ligand 1, and macrophage inflammatory protein-2/CXC chemokine ligand 2) than controls, and these effects were markedly diminished by protease inhibition. Inhibition of PARs also blunted the HDE-induced cytokine release from BECs. In addition, protease depletion inhibited HDE-induced BEC intracellular PKCα and PKCε activation. C57BL/6J mice administered 12.5% HDE intranasally, either once or daily for 3 wk, exhibited increased total cellular and neutrophil influx, bronchial alveolar fluid inflammatory cytokines, lung histopathology, and inflammatory scores compared with mice receiving protease-depleted HDE. These data suggest that proteases in dust from CAFOs are important mediators of lung inflammation, and these proteases and their receptors may provide novel targets for therapeutic intervention in CAFO dust-induced airways disease.
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Affiliation(s)
- Debra J Romberger
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska; Veterans Affairs Nebraska-Western Iowa Healthcare System, Omaha, Nebraska;
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Chelsea P Souder
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - William West
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Xiang-de Liu
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Myron L Toews
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, Nebraska
| | - Todd A Wyatt
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska; Veterans Affairs Nebraska-Western Iowa Healthcare System, Omaha, Nebraska; Department of Environmental, Agricultural, and Occupational Health, University of Nebraska Medical Center, Omaha, Nebraska; and
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25
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Abstract
Endothelial barrier function is an essential and tightly regulated process that ensures proper compartmentalization of the vascular and interstitial space, while allowing for the diffusive exchange of small molecules and the controlled trafficking of macromolecules and immune cells. Failure to control endothelial barrier integrity results in excessive leakage of fluid and proteins from the vasculature that can rapidly become fatal in scenarios such as sepsis or the acute respiratory distress syndrome. Here, we highlight recent advances in our understanding on the regulation of endothelial permeability, with a specific focus on the endothelial glycocalyx and endothelial scaffolds, regulatory intracellular signaling cascades, as well as triggers and mediators that either disrupt or enhance endothelial barrier integrity, and provide our perspective as to areas of seeming controversy and knowledge gaps, respectively.
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Affiliation(s)
- Dolly Mehta
- Department of Pharmacology and Center for Lung and Vascular Biology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois;
| | - Krishnan Ravindran
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
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