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Brenner RJ, Balan KA, Andersen MPL, Dugrenot E, Vrijdag XCE, Van Waart H, Tillmans F. A review of nutritional recommendations for scuba divers. J Int Soc Sports Nutr 2024; 21:2402386. [PMID: 39314069 PMCID: PMC11423531 DOI: 10.1080/15502783.2024.2402386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Accepted: 09/03/2024] [Indexed: 09/25/2024] Open
Abstract
BACKGROUND Scuba diving is an increasingly popular activity that involves the use of specialized equipment and compressed air to breathe underwater. Scuba divers are subject to the physiological consequences of being immersed in a high-pressure environment, including, but not limited to, increased work of breathing and kinetic energy expenditure, decreased fluid absorption, and alteration of metabolism. Individual response to these environmental stressors may result in a differential risk of decompression sickness, a condition thought to result from excess nitrogen bubbles forming in a diver's tissues. While the mechanisms of decompression sickness are still largely unknown, it has been postulated that this response may further be influenced by the diver's health status. Nutritional intake has direct relevancy to inflammation status and oxidative stress resistance, both of which have been associated with increased decompression stress. While nutritional recommendations have been determined for saturation divers, these recommendations are likely overly robust for recreational divers, considering that the differences in time spent under pressure and the maximum depth could result nonequivalent energetic demands. Specific recommendations for recreational divers remain largely undefined. METHODS This narrative review will summarize existing nutritional recommendations and their justification for recreational divers, as well as identify gaps in research regarding connections between nutritional intake and the health and safety of divers. RESULTS Following recommendations made by the Institute of Medicine and the Naval Medical Research Institute of Bethesda, recreational divers are advised to consume ~170-210 kJ·kg-1 (40-50 kcal·kg-1) body mass, depending on their workload underwater, in a day consisting of 3 hours' worth of diving above 46 msw. Recommendations for macronutrient distribution for divers are to derive 50% of joules from carbohydrates and less than 30% of joules from fat. Protein consumption is recommended to reach a minimum of 1 g of protein·kg-1 of body mass a day to mitigate loss of appetite while meeting energetic requirements. All divers should take special care to hydrate themselves with an absolute minimum of 500 ml of fluid per hour for any dive longer than 3 hours, with more recent studies finding 0.69 liters of water two hours prior to diving is most effective to minimize bubble loads. While there is evidence that specialized diets may have specific applications in commercial or military diving, they are not advisable for the general recreational diving population considering the often extreme nature of these diets, and the lack of research on their effectiveness on a recreational diving population. CONCLUSIONS Established recommendations do not account for changes in temperature, scuba equipment, depth, dive time, work of breathing, breathing gas mix, or individual variation in metabolism. Individual recommendations may be more accurate when accounting for basal metabolic rate and physical activity outside of diving. However, more research is needed to validate these estimates against variation in dive profile and diver demographics.
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Affiliation(s)
| | | | - Marie P. L. Andersen
- Divers Alert Network, Research, Durham, NC, USA
- The University of North Carolina at Chapel Hill, Gillings School of Public Health, Chapel Hill, NC, USA
| | - Emmanuel Dugrenot
- Divers Alert Network, Research, Durham, NC, USA
- University of Brest, ORPHY’s Laboratory, Brest, France
- The University of North Carolina at Chapel Hill, Department of Biomedical Engineering, Chapel Hill, NC, USA
| | - Xavier C. E. Vrijdag
- The University of Auckland, Department of Anaesthesiology, Auckland, New Zealand
| | - Hanna Van Waart
- The University of Auckland, Department of Anaesthesiology, Auckland, New Zealand
| | - Frauke Tillmans
- Divers Alert Network, Research, Durham, NC, USA
- The University of North Carolina at Chapel Hill, Department of Biomedical Engineering, Chapel Hill, NC, USA
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Cao Z, Jiang X, He Y, Zheng X. Metabolic landscape in venous thrombosis: insights into molecular biology and therapeutic implications. Ann Med 2024; 56:2401112. [PMID: 39297312 DOI: 10.1080/07853890.2024.2401112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 03/20/2024] [Accepted: 05/12/2024] [Indexed: 09/21/2024] Open
Abstract
The findings of the last decade suggest a complex link between inflammatory cells, coagulation, and the activation of platelets and their synergistic interaction to promote venous thrombosis. Inflammation is present throughout the process of venous thrombosis, and various metabolic pathways of erythrocytes, endothelial cells, and immune cells involved in venous thrombosis, including glucose metabolism, lipid metabolism, homocysteine metabolism, and oxidative stress, are associated with inflammation. While the metabolic microenvironment has been identified as a marker of malignancy, recent studies have revealed that for cancer thrombosis, alterations in the metabolic microenvironment appear to also be a potential risk. In this review, we discuss how the synergy between metabolism and thrombosis drives thrombotic disease. We also explore the great potential of anti-inflammatory strategies targeting venous thrombosis and the complex link between anti-inflammation and metabolism. Furthermore, we suggest how we can use our existing knowledge to reduce the risk of venous thrombosis.
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Affiliation(s)
- Zheng Cao
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Cardiovascular Research Institute, Wuhan University, Wuhan, Hubei, China
- Hubei Key Laboratory of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
| | - Xuejun Jiang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Cardiovascular Research Institute, Wuhan University, Wuhan, Hubei, China
- Hubei Key Laboratory of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
| | - Yiyu He
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Cardiovascular Research Institute, Wuhan University, Wuhan, Hubei, China
- Hubei Key Laboratory of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
| | - Xiaoxin Zheng
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Cardiovascular Research Institute, Wuhan University, Wuhan, Hubei, China
- Hubei Key Laboratory of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
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Dugrenot E, Guernec A, Orsat J, Guerrero F. Gene expression of Decompression Sickness-resistant rats through a miRnome/transcriptome crossed approach. Commun Biol 2024; 7:1245. [PMID: 39358457 PMCID: PMC11446962 DOI: 10.1038/s42003-024-06963-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 09/25/2024] [Indexed: 10/04/2024] Open
Abstract
Susceptibility to decompression sickness (DCS) is characterized by a wide inter-individual variability, the origins of which are still poorly understood. We selectively bred rats with at least a 3-fold greater resistance to DCS than standard rats after 6 generations. In order to better understand DCS mechanisms, we compared the static genome expression of these resistant rats from the 10th generation to their counterparts of the initial non-resistant Wistar strain, by a microarray transcriptomic approach coupled and crossed with a PCR plates miRnome study. Thus, we identified differentially expressed genes on selected males and females, as well as gender differences in those genes, and we crossed these transcripts with the respective targets of the differentially expressed microRNAs. Our results highlight pathways involved in inflammatory responses, circadian clock, cell signaling and motricity, phagocytosis or apoptosis, and they confirm the importance of inflammation in DCS pathophysiology.
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Affiliation(s)
- Emmanuel Dugrenot
- Univ Brest, ORPHY's Laboratory, 6 Av Le Gorgeu, CS93837, F-29238, Brest, Cedex, France.
- Tek Diving SAS, Brest, France.
- Divers Alert Network, Durham, NC, USA.
- Joint Department of Biomedical Engineering, The University of North Carolina and North Carolina State University, Chapel Hill, NC, USA.
| | - Anthony Guernec
- Univ Brest, ORPHY's Laboratory, 6 Av Le Gorgeu, CS93837, F-29238, Brest, Cedex, France
| | - Jérémy Orsat
- Univ Brest, ORPHY's Laboratory, 6 Av Le Gorgeu, CS93837, F-29238, Brest, Cedex, France
| | - François Guerrero
- Univ Brest, ORPHY's Laboratory, 6 Av Le Gorgeu, CS93837, F-29238, Brest, Cedex, France
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4
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Bhat AR, Arya AK, Bhopale VM, Imtiyaz Z, Xu S, Bedir D, Thom SR. Persistent neuroinflammation and functional deficits in a murine model of decompression sickness. J Appl Physiol (1985) 2024; 137:63-73. [PMID: 38660728 PMCID: PMC11389893 DOI: 10.1152/japplphysiol.00097.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 04/11/2024] [Accepted: 04/22/2024] [Indexed: 04/26/2024] Open
Abstract
We hypothesized that early intra-central nervous system (CNS) responses in a murine model of decompression sickness (DCS) would be reflected by changes in the microparticles (MPs) that exit the brain via the glymphatic system, and due to systemic responses the MPs would cause inflammatory changes lasting for many days leading to functional neurological deficits. Elevations on the order of threefold of blood-borne inflammatory MPs, neutrophil activation, glymphatic flow, and neuroinflammation in cerebral cortex and hippocampus were found in mice at 12 days after exposure to 760 kPa of air for 2 h. Mice also exhibited a significant decline in memory and locomotor activity, as assessed by novel object recognition and rotarod testing. Similar inflammatory changes in blood, neuroinflammation, and functional impairments were initiated in naïve mice by injection of filamentous (F-) actin-positive MPs, but not F-actin-negative MPs, obtained from decompressed mice. We conclude that high pressure/decompression stress establishes a systemic inflammatory process that results in prolonged neuroinflammation and functional impairments in the mouse decompression model.NEW & NOTEWORTHY Elevated glymphatic flow due to astrocyte and microglial activation from high-pressure exposure triggers release of microparticles (MPs) to the circulation where neutrophil activation and production of filamentous (F)-actin expressing MPs result in a persistent feed-forward neuroinflammatory cycle and functional deficits lasting for at least 12 days.
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Affiliation(s)
- Abid R Bhat
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Awadhesh K Arya
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Zuha Imtiyaz
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Su Xu
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Dilara Bedir
- Department of Undersea and Hyperbaric Medicine, Gulhane Education and Research Hospital, Istanbul, Turkey
| | - Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
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Imtiyaz Z, Bhopale VM, Arya AK, Bhat AR, Thom SR. Microparticles in Human Perspiration as an Inflammatory Response Index. Diagnostics (Basel) 2024; 14:1293. [PMID: 38928708 PMCID: PMC11203027 DOI: 10.3390/diagnostics14121293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 05/31/2024] [Accepted: 06/12/2024] [Indexed: 06/28/2024] Open
Abstract
A blood component analysis is an early step for evaluating inflammatory disorders, but it can be unfeasible in some settings. This pilot study assessed whether extracellular vesicle (EV) changes in perspiration are parallel to those occurring in blood as an alternative or complementary option to diagnose an inflammatory response. In parallel studies, EVs were analyzed in perspiration and blood obtained before and after five self-contained underwater breathing apparatus (SCUBA) divers at the National Aquarium in Baltimore performed a dive to 3.98 m of sea water for 40 min, and five non-divers performed an exercise routine at ambient atmospheric pressure. The results demonstrated that microparticles (MPs) are present in perspiration, their numbers increase in the blood in response to SCUBA diving, and the interleukin (IL)-1β content increases. In contrast, while blood-borne MPs became elevated in response to terrestrial exercise, no statistically significant increases occurred in perspiration, and there were no changes in IL-1β. There were no statistically significant elevations in the exosomes in perspiration or blood in response to SCUBA diving and few changes following terrestrial exercise. These findings suggest that an MP perspiration analysis could be a non-invasive method for detecting inflammatory responses that can occur due to the oxidative stress associated with SCUBA diving.
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Affiliation(s)
| | | | | | | | - Stephen R. Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA; (Z.I.); (V.M.B.); (A.K.A.); (A.R.B.)
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Mitchell SJ. Decompression illness: a comprehensive overview. Diving Hyperb Med 2024; 54:1-53. [PMID: 38537300 PMCID: PMC11168797 DOI: 10.28920/dhm54.1.suppl.1-53] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 01/31/2024] [Indexed: 05/20/2024]
Abstract
Decompression illness is a collective term for two maladies (decompression sickness [DCS] and arterial gas embolism [AGE]) that may arise during or after surfacing from compressed gas diving. Bubbles are the presumed primary vector of injury in both disorders, but the respective sources of bubbles are distinct. In DCS bubbles form primarily from inert gas that becomes dissolved in tissues over the course of a compressed gas dive. During and after ascent ('decompression'), if the pressure of this dissolved gas exceeds ambient pressure small bubbles may form in the extravascular space or in tissue blood vessels, thereafter passing into the venous circulation. In AGE, if compressed gas is trapped in the lungs during ascent, pulmonary barotrauma may introduce bubbles directly into the pulmonary veins and thence to the systemic arterial circulation. In both settings, bubbles may provoke ischaemic, inflammatory, and mechanical injury to tissues and their associated microcirculation. While AGE typically presents with stroke-like manifestations referrable to cerebral involvement, DCS can affect many organs including the brain, spinal cord, inner ear, musculoskeletal tissue, cardiopulmonary system and skin, and potential symptoms are protean in both nature and severity. This comprehensive overview addresses the pathophysiology, manifestations, prevention and treatment of both disorders.
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Affiliation(s)
- Simon J Mitchell
- Department of Anaesthesiology, School of Medicine, University of Auckland, Auckland, New Zealand
- Department of Anaesthesia, Auckland City Hospital, Auckland, New Zealand
- Slark Hyperbaric Medicine Unit, North Shore Hospital, Auckland, New Zealand
- Corresponding address: Department of Anaesthesiology, School of Medicine, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand, ORCiD: 0000-0002-5149-6371,
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Ashoub MH, Salavatipour MS, Kasgari FH, Valandani HM, Khalilabadi RM. Extracellular microvesicles: biologic properties, biogenesis, and applications in leukemia. Mol Cell Biochem 2024; 479:419-430. [PMID: 37084166 DOI: 10.1007/s11010-023-04734-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 04/07/2023] [Indexed: 04/22/2023]
Abstract
Microvesicles are cellular membrane vesicles of which size is limited to 30-1000 nm. Almost all cells release them in response to activation signals and apoptosis. Their ability for intercellular communication and enhancement of potential for information exchange (between them) has attracted much interest. Their content is affected by the content of the mother cell, which can help identify their origin. Furthermore, these particles can change the physiology of the target cells by transferring a set of molecules to them and changing the epigenetics of the cells by transferring DNA and RNA. These changes can be induced in cells close to the mother and distant cells. Significant activities of these microvesicles are known both in physiological and pathologic conditions. In this regard, we have reviewed these small particle elements, their contents, and the way of synthesis. Finally, we discussed their current known roles to reveal more potential applications in leukemia.
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Affiliation(s)
- Muhammad Hossein Ashoub
- Department of Hematology and Medical Laboratory Sciences, Faculty of Allied Medicine, Kerman University of Medical Sciences, Kerman, Iran
- Cell Therapy and Regenerative Medicine Comprehensive Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Maryam Samareh Salavatipour
- Department of Hematology and Medical Laboratory Sciences, Faculty of Allied Medicine, Kerman University of Medical Sciences, Kerman, Iran
- Department of Applied Cell Sciences, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Hoseinpour Kasgari
- Department of Hematology and Medical Laboratory Sciences, Faculty of Allied Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Hajar Mardani Valandani
- Department of Hematology and Medical Laboratory Sciences, Faculty of Allied Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Roohollah Mirzaee Khalilabadi
- Department of Hematology and Medical Laboratory Sciences, Faculty of Allied Medicine, Kerman University of Medical Sciences, Kerman, Iran.
- Student Research Committee, Faculty of Allied Medicine, Kerman University of Medical Sciences, Kerman, Iran.
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8
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Zhu Y, Wang K, Jia X, Fu C, Yu H, Wang Y. Antioxidant peptides, the guardian of life from oxidative stress. Med Res Rev 2024; 44:275-364. [PMID: 37621230 DOI: 10.1002/med.21986] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 08/01/2023] [Accepted: 08/06/2023] [Indexed: 08/26/2023]
Abstract
Reactive oxygen species (ROS) are produced during oxidative metabolism in aerobic organisms. Under normal conditions, ROS production and elimination are in a relatively balanced state. However, under internal or external environmental stress, such as high glucose levels or UV radiation, ROS production can increase significantly, leading to oxidative stress. Excess ROS production not only damages biomolecules but is also closely associated with the pathogenesis of many diseases, such as skin photoaging, diabetes, and cancer. Antioxidant peptides (AOPs) are naturally occurring or artificially designed peptides that can reduce the levels of ROS and other pro-oxidants, thus showing great potential in the treatment of oxidative stress-related diseases. In this review, we discussed ROS production and its role in inducing oxidative stress-related diseases in humans. Additionally, we discussed the sources, mechanism of action, and evaluation methods of AOPs and provided directions for future studies on AOPs.
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Affiliation(s)
- Yiyun Zhu
- Department of Biopharmaceutical Sciences, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Kang Wang
- Department of Biopharmaceutical Sciences, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Xinyi Jia
- National University of Singapore (Suzhou) Research Institute, Suzhou, Jiangsu, China
- Department of Food Science and Technology, Food Science and Technology Center, National University of Singapore, Singapore, Singapore
| | - Caili Fu
- National University of Singapore (Suzhou) Research Institute, Suzhou, Jiangsu, China
| | - Haining Yu
- Department of Bioscience and Biotechnology, Dalian University of Technology, Dalian, Liaoning, China
| | - Yipeng Wang
- Department of Biopharmaceutical Sciences, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
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Harrell AG, Thom SR, Shields C. Dissolved gases from pressure changes in the lungs elicit an immune response in human peripheral blood. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.18.562856. [PMID: 37904988 PMCID: PMC10614899 DOI: 10.1101/2023.10.18.562856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Conventional dogma suggests that decompression sickness (DCS) is caused by nitrogen bubble nucleation in the blood vessels and/or tissues; however, the abundance of bubbles does not correlate with DCS severity. Since immune cells respond to chemical and environmental cues, we hypothesized that the elevated partial pressures of dissolved gases drive aberrant immune cell phenotypes in the alveolar vasculature. To test this hypothesis, we measured immune responses within human lung-on-a-chip devices established with primary alveolar cells and microvascular cells. Devices were pressurized to 1.0 or 3.5 atm and surrounded by normal alveolar air or oxygen-reduced air. Phenotyping of neutrophils, monocytes, and dendritic cells as well as multiplexed ELISA revealed that immune responses occur within 1 hour and that normal alveolar air (i.e., hyperbaric oxygen and nitrogen) confer greater immune activation. This work strongly suggests innate immune cell reactions initiated at elevated partial pressures contribute to the etiology of DCS.
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Affiliation(s)
- Abigail G. Harrell
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80303, United States
| | - Stephen R. Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - C.Wyatt Shields
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80303, United States
- Biomedical Engineering Program, University of Colorado Boulder, Boulder CO 80303, United States
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Arya AK, Balestra C, Bhopale VM, Tuominen LJ, Räisänen-Sokolowski A, Dugrenot E, L’Her E, Bhat AR, Thom SR. Elevations of Extracellular Vesicles and Inflammatory Biomarkers in Closed Circuit SCUBA Divers. Int J Mol Sci 2023; 24:5969. [PMID: 36983042 PMCID: PMC10053377 DOI: 10.3390/ijms24065969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/09/2023] [Accepted: 03/20/2023] [Indexed: 03/30/2023] Open
Abstract
Blood-borne extracellular vesicles and inflammatory mediators were evaluated in divers using a closed circuit rebreathing apparatus and custom-mixed gases to diminish some diving risks. "Deep" divers (n = 8) dove once to mean (±SD) 102.5 ± 1.2 m of sea water (msw) for 167.3 ± 11.5 min. "Shallow" divers (n = 6) dove 3 times on day 1, and then repetitively over 7 days to 16.4 ± 3.7 msw, for 49.9 ± 11.9 min. There were statistically significant elevations of microparticles (MPs) in deep divers (day 1) and shallow divers at day 7 that expressed proteins specific to microglia, neutrophils, platelets, and endothelial cells, as well as thrombospondin (TSP)-1 and filamentous (F-) actin. Intra-MP IL-1β increased by 7.5-fold (p < 0.001) after day 1 and 41-fold (p = 0.003) at day 7. Intra-MP nitric oxide synthase-2 (NOS2) increased 17-fold (p < 0.001) after day 1 and 19-fold (p = 0.002) at day 7. Plasma gelsolin (pGSN) levels decreased by 73% (p < 0.001) in deep divers (day 1) and 37% in shallow divers by day 7. Plasma samples containing exosomes and other lipophilic particles increased from 186% to 490% among the divers but contained no IL-1β or NOS2. We conclude that diving triggers inflammatory events, even when controlling for hyperoxia, and many are not proportional to the depth of diving.
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Affiliation(s)
- Awadhesh K. Arya
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Costantino Balestra
- Environmental, Occupational, Aging (Integrative) Physiology Laboratory, Haute Ecole Bruxelles-Brabant (HE2B), 1090 Brussels, Belgium
- DAN Europe Research Division, DAN Europe Foundation, 64026 Roseto degli Abruzzi, Italy
| | - Veena M. Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Laura J. Tuominen
- DAN Europe Research Division, DAN Europe Foundation, 64026 Roseto degli Abruzzi, Italy
| | | | - Emmanuel Dugrenot
- Divers Alert Network, Durham, NC 27707, USA
- Laboratoire ORPHY, EA 4324, Université de Bretagne Occidentale UFR Science, 29238 Brest, France
| | - Erwan L’Her
- LaTIM INSERM UMR 1101, Université de Bretagne Occidentale UFR Science, 29238 Brest, France
| | - Abid R. Bhat
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Stephen R. Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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11
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Thom SR, Bhopale VM, Bhat AR, Arya AK, Ruhela D, Qiao G, Li X, Tang S, Xu S. Neuroinflammation with increased glymphatic flow in a murine model of decompression sickness. J Neurophysiol 2023; 129:662-671. [PMID: 36752495 PMCID: PMC10010924 DOI: 10.1152/jn.00005.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 01/27/2023] [Accepted: 01/28/2023] [Indexed: 02/09/2023] Open
Abstract
This project investigated glial-based lymphatic (glymphatic) function and its role in a murine model of decompression sickness (DCS). DCS pathophysiology is traditionally viewed as being related to gas bubble formation from insoluble gas on decompression. However, a body of work implicates a role for a subset of inflammatory extracellular vesicles, 0.1 to 1 µm microparticles (MPs) that are elevated in human and rodent models in response to high gas pressure and rise further after decompression. Herein, we describe immunohistochemical and Western blot evidence showing that following high air pressure exposure, there are elevations of astrocyte NF-κB and microglial-ionized calcium-binding adaptor protein-1 (IBA-1) along with fluorescence contrast and MRI findings of an increase in glymphatic flow. Concomitant elevations of central nervous system-derived MPs coexpressing thrombospondin-1 (TSP) drain to deep cervical nodes and then to blood where they cause neutrophil activation. A new set of blood-borne MPs are generated that express filamentous actin at the surface that exacerbate neutrophil activation. Blood-brain barrier integrity is disrupted due to activated neutrophil sequestration that causes further astrocyte and microglial perturbation. When postdecompression node or blood MPs are injected into naïve mice, the same spectrum of abnormalities occur and they are blocked with coadministration of antibody to TSP. We conclude that high pressure/decompression causes neuroinflammation with an increased glymphatic flow. The resulting systemic liberation of TSP-expressing MPs sustains the neuroinflammatory cycle lasting for days.NEW & NOTEWORTHY A murine model of central nervous system (CNS) decompression sickness demonstrates that high gas pressure activates astrocytes and microglia triggering inflammatory microparticle (MP) production. Thrombospondin-expressing MPs are released from the CNS via enhanced glymphatic flow to the systemic circulation where they activate neutrophils. Secondary production of neutrophil-derived MPs causes further cell activation and neutrophil adherence to the brain microvasculature establishing a feed-forward neuroinflammatory cycle.
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Affiliation(s)
- Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Abid R Bhat
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Awadhesh K Arya
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Deepa Ruhela
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Guanda Qiao
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Xin Li
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Shiyu Tang
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Su Xu
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
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Wang S, Li C, Yuan Y, Xiong Y, Xu H, Pan W, Pan H, Zhu Z. Microvesicles as drug delivery systems: A new frontier for bionic therapeutics in cancer. J Drug Deliv Sci Technol 2023. [DOI: 10.1016/j.jddst.2022.104088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Varying Oxygen Partial Pressure Elicits Blood-Borne Microparticles Expressing Different Cell-Specific Proteins-Toward a Targeted Use of Oxygen? Int J Mol Sci 2022; 23:ijms23147888. [PMID: 35887238 PMCID: PMC9322965 DOI: 10.3390/ijms23147888] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/14/2022] [Accepted: 07/16/2022] [Indexed: 02/06/2023] Open
Abstract
Oxygen is a powerful trigger for cellular reactions, but there are few comparative investigations assessing the effects over a large range of partial pressures. We investigated a metabolic response to single exposures to either normobaric (10%, 15%, 30%, 100%) or hyperbaric (1.4 ATA, 2.5 ATA) oxygen. Forty-eight healthy subjects (32 males/16 females; age: 43.7 ± 13.4 years, height: 172.7 ± 10.07 cm; weight 68.4 ± 15.7 kg) were randomly assigned, and blood samples were taken before and 2 h after each exposure. Microparticles (MPs) expressing proteins specific to different cells were analyzed, including platelets (CD41), neutrophils (CD66b), endothelial cells (CD146), and microglia (TMEM). Phalloidin binding and thrombospondin-1 (TSP), which are related to neutrophil and platelet activation, respectively, were also analyzed. The responses were found to be different and sometimes opposite. Significant elevations were identified for MPs expressing CD41, CD66b, TMEM, and phalloidin binding in all conditions but for 1.4 ATA, which elicited significant decreases. Few changes were found for CD146 and TSP. Regarding OPB, further investigation is needed to fully understand the future applications of such findings.
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14
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Eustes AS, Dayal S. The Role of Platelet-Derived Extracellular Vesicles in Immune-Mediated Thrombosis. Int J Mol Sci 2022; 23:7837. [PMID: 35887184 PMCID: PMC9320310 DOI: 10.3390/ijms23147837] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 07/12/2022] [Accepted: 07/13/2022] [Indexed: 12/14/2022] Open
Abstract
Platelet-derived extracellular vesicles (PEVs) play important roles in hemostasis and thrombosis. There are three major types of PEVs described based on their size and characteristics, but newer types may continue to emerge owing to the ongoing improvement in the methodologies and terms used to define various types of EVs. As the literature on EVs is growing, there are continuing attempts to standardize protocols for EV isolation and reach consensus in the field. This review provides information on mechanisms of PEV production, characteristics, cellular interaction, and their pathological role, especially in autoimmune and infectious diseases. We also highlight the mechanisms through which PEVs can activate parent cells in a feedback loop.
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Affiliation(s)
- Alicia S. Eustes
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA;
| | - Sanjana Dayal
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA;
- Iowa City VA Healthcare System, Iowa City, IA 52246, USA
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15
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Aparicio-Trejo OE, Aranda-Rivera AK, Osorio-Alonso H, Martínez-Klimova E, Sánchez-Lozada LG, Pedraza-Chaverri J, Tapia E. Extracellular Vesicles in Redox Signaling and Metabolic Regulation in Chronic Kidney Disease. Antioxidants (Basel) 2022; 11:antiox11020356. [PMID: 35204238 PMCID: PMC8868440 DOI: 10.3390/antiox11020356] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 01/26/2022] [Accepted: 02/03/2022] [Indexed: 12/17/2022] Open
Abstract
Chronic kidney disease (CKD) is a world health problem increasing dramatically. The onset of CKD is driven by several mechanisms; among them, metabolic reprogramming and changes in redox signaling play critical roles in the advancement of inflammation and the subsequent fibrosis, common pathologies observed in all forms of CKD. Extracellular vesicles (EVs) are cell-derived membrane packages strongly associated with cell-cell communication since they transfer several biomolecules that serve as mediators in redox signaling and metabolic reprogramming in the recipient cells. Recent studies suggest that EVs, especially exosomes, the smallest subtype of EVs, play a fundamental role in spreading renal injury in CKD. Therefore, this review summarizes the current information about EVs and their cargos’ participation in metabolic reprogramming and mitochondrial impairment in CKD and their role in redox signaling changes. Finally, we analyze the effects of these EV-induced changes in the amplification of inflammatory and fibrotic processes in the progression of CKD. Furthermore, the data suggest that the identification of the signaling pathways involved in the release of EVs and their cargo under pathological renal conditions can allow the identification of new possible targets of injury spread, with the goal of preventing CKD progression.
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Affiliation(s)
- Omar Emiliano Aparicio-Trejo
- Departamento de Fisiopatología Cardio-Renal, Instituto Nacional de Cardiología "Ignacio Chávez", Mexico City 14080, Mexico
| | - Ana Karina Aranda-Rivera
- Laboratorio F-315, Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Horacio Osorio-Alonso
- Departamento de Fisiopatología Cardio-Renal, Instituto Nacional de Cardiología "Ignacio Chávez", Mexico City 14080, Mexico
| | - Elena Martínez-Klimova
- Laboratorio F-315, Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Laura Gabriela Sánchez-Lozada
- Departamento de Fisiopatología Cardio-Renal, Instituto Nacional de Cardiología "Ignacio Chávez", Mexico City 14080, Mexico
| | - José Pedraza-Chaverri
- Laboratorio F-315, Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Edilia Tapia
- Departamento de Fisiopatología Cardio-Renal, Instituto Nacional de Cardiología "Ignacio Chávez", Mexico City 14080, Mexico
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16
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Ruhela D, Bhopale VM, Kalakonda S, Thom SR. Astrocyte-derived microparticles initiate a neuroinflammatory cycle due to carbon monoxide poisoning. Brain Behav Immun Health 2021; 18:100398. [PMID: 34917988 PMCID: PMC8645452 DOI: 10.1016/j.bbih.2021.100398] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 11/30/2022] Open
Abstract
We hypothesized that carbon monoxide (CO) establishes an inflammatory cycle mediated by microparticles (MPs). Mice exposed to a CO protocol (1000 ppm for 40 min and then 3000 ppm for 20 min) that causes neuroinflammation exhibit NF-κB activation in astrocytes leading to generation of MPs expressing thrombospondin-1(TSP-1) that collect in deep cervical lymph nodes draining the brain glymphatic system. TSP-1 bearing MPs gain access to the blood stream where they activate neutrophils to generate a new family of MPs, and also stimulate endothelial cells as documented by leakage of intravenous 2000 kDa dextran. At the brain microvasculature, neutrophil and MPs sequestration, and myeloperoxidase activity result in elevations of the p65 subunit of NF-κB, serine 536 phosphorylated p65, CD36, and loss of astrocyte aquaporin-4 that persist for at least 7 days. Knock-out mice lacking the CD36 membrane receptor are resistant to all CO inflammatory changes. Events triggered by CO are recapitulated in naïve wild type mice injected with cervical node MPs from CO-exposed mice, but not control mice. All MPs-mediated events are inhibited with a NF-κB inhibitor, a myeloperoxidase inhibitor, or anti-TSP-1 antibodies. We conclude that astrocyte-derived MPs expressing TSP-1 establish a feed-forward neuroinflammatory cycle involving endothelial CD36-to-astrocyte NF-κB crosstalk. As there is currently no treatment for CO-induced neurological sequelae, these findings pose several possible sites for therapeutic interventions. Carbon monoxide (CO) causes neurological injuries poorly correlated to hypoxic stress. Astrocyte NF-κB triggers thrombospondin-1(TSP-1) microparticle (MP) production. TSP-1 MPs enter the blood stream, stimulating neutrophils and endothelium. Circulating MPs linkage to endothelial cell CD36 causes vascular damage. Endothelial CD36-to-astrocyte NF-κB crosstalk establishes a neuroinflammatory cycle.
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Key Words
- 4-methyl-N1-(3-phenyl-propyl)-benzene-1,2-diamine, JSH-23
- Acetyl-lysyltyrosylcysteine
- Aquaporin-4
- Aquaporin-4, AQP4
- Astrocyte
- CD36
- Carbon monoxide, CO
- Carboxyhemoglobin, COHb
- Glial fibrillary acidic protein, GFAP
- Glymphatics
- Magnetic resonance imaging, MRI
- Microparticles, MPs
- Myelin basic protein, MBP
- Myeloperoxidase
- Myeloperoxidase, MPO
- Neuronal pentraxin receptor, NPR
- Neutrophil
- Nod-like receptor pyrin containing 3, NLRP3
- Nuclear factor- κB, NF-κB
- Phosphate buffered saline, PBS
- Phosphatidylserine, (PS)
- Thrombospondin-1
- Thrombospondin-1, TSP-1
- Transmembrane protein119, TMEM
- acetyl-lysyltyrosylcysteine, KYC
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Affiliation(s)
- Deepa Ruhela
- Department of Emergency Medicine, University of Maryland School of Medicine, USA
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, USA
| | - Sudhakar Kalakonda
- Department of Emergency Medicine, University of Maryland School of Medicine, USA
| | - Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, USA
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17
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Yang N, Zhao Y, Wu X, Zhang N, Song H, Wei W, Liu ML. Recent advances in Extracellular Vesicles and their involvements in vasculitis. Free Radic Biol Med 2021; 171:203-218. [PMID: 33951487 PMCID: PMC9107955 DOI: 10.1016/j.freeradbiomed.2021.04.033] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/24/2021] [Accepted: 04/27/2021] [Indexed: 01/08/2023]
Abstract
Systemic vasculitis is a heterogeneous group of multisystem autoimmune disorders characterized by inflammation of blood vessels. Although many progresses in diagnosis and immunotherapies have been achieved over the past decades, there are still many unanswered questions about vasculitis from pathological understanding to more advanced therapies. Extracellular vesicles (EVs) are double-layer phospholipid membrane vesicles harboring various cargoes. EVs can be classified into exosomes, microvesicles (MVs), and apoptotic bodies depending on their size and origin of cellular compartment. EVs can be released by almost all cell types and may be involved in physical and pathological processes including inflammation and autoimmune responses. In systemic vasculitis, EVs may have pathogenic involvement in inflammation, autoimmune responses, thrombosis, endothelium injury, angiogenesis and intimal hyperplasia. EV-associated redox reaction may also be involved in vasculitis pathogenesis by inducing inflammation, endothelial injury and thrombosis. Additionally, EVs may serve as specific biomarkers for diagnosis or monitoring of disease activity and therapeutic efficacy, i.e. AAV-associated renal involvement. In this review, we have discussed the recent advances of EVs, especially their roles in pathogenesis and clinical involvements in vasculitis.
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Affiliation(s)
- Nan Yang
- Department of Rheumatology and Immunology, Tianjin Medical University General Hospital, Tianjin, 300052, PR China
| | - Yin Zhao
- Department of Rheumatology and Immunology, Tianjin Medical University General Hospital, Tianjin, 300052, PR China
| | - Xiuhua Wu
- Department of Rheumatology and Immunology, Tianjin Medical University General Hospital, Tianjin, 300052, PR China
| | - Na Zhang
- Department of Rheumatology and Immunology, Tianjin Medical University General Hospital, Tianjin, 300052, PR China
| | - Haoming Song
- Department of Cardiology, Tongji Hospital, Tongji University School of Medicine, Shanghai, 200065, PR China
| | - Wei Wei
- Department of Rheumatology and Immunology, Tianjin Medical University General Hospital, Tianjin, 300052, PR China.
| | - Ming-Lin Liu
- Department of Dermatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA; Corporal Michael J. Crescenz VA Medical Center (Philadelphia), Philadelphia, PA, 19104, USA.
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18
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Magri K, Eftedal I, Petroni Magri V, Matity L, Azzopardi CP, Muscat S, Pace NP. Acute Effects on the Human Peripheral Blood Transcriptome of Decompression Sickness Secondary to Scuba Diving. Front Physiol 2021; 12:660402. [PMID: 34177613 PMCID: PMC8222921 DOI: 10.3389/fphys.2021.660402] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 05/12/2021] [Indexed: 01/22/2023] Open
Abstract
Decompression sickness (DCS) develops due to inert gas bubble formation in bodily tissues and in the circulation, leading to a wide range of potentially serious clinical manifestations. Its pathophysiology remains incompletely understood. In this study, we aim to explore changes in the human leukocyte transcriptome in divers with DCS compared to closely matched unaffected controls after uneventful diving. Cases (n = 7) were divers developing the typical cutis marmorata rash after diving with a confirmed clinical diagnosis of DCS. Controls (n = 6) were healthy divers who surfaced from a ≥25 msw dive without decompression violation or evidence of DCS. Blood was sampled at two separate time points-within 8 h of dive completion and 40-44 h later. Transcriptome analysis by RNA-Sequencing followed by bioinformatic analysis was carried out to identify differentially expressed genes and relate their function to biological pathways. In DCS cases, we identified enrichment of transcripts involved in acute inflammation, activation of innate immunity and free radical scavenging pathways, with specific upregulation of transcripts related to neutrophil function and degranulation. DCS-induced transcriptomic events were reversed at the second time point following exposure to hyperbaric oxygen. The observed changes are consistent with findings from animal models of DCS and highlight a continuum between the responses elicited by uneventful diving and diving complicated by DCS. This study sheds light on the inflammatory pathophysiology of DCS and the associated immune response. Such data may potentially be valuable in the search for novel treatments targeting this disease.
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Affiliation(s)
- Kurt Magri
- Hyperbaric Unit, Department of Medicine, Mater Dei Hospital, Msida, Malta
| | - Ingrid Eftedal
- Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, NTNU Norwegian University of Science and Technology, Trondheim, Norway
- Faculty of Nursing and Health Sciences, Nord University, Bodø, Norway
| | - Vanessa Petroni Magri
- Department of Clinical Pharmacology and Therapeutics, Faculty of Medicine and Surgery, University of Malta, Msida, Malta
| | - Lyubisa Matity
- Hyperbaric Unit, Department of Medicine, Mater Dei Hospital, Msida, Malta
| | | | - Stephen Muscat
- Hyperbaric Unit, Department of Medicine, Mater Dei Hospital, Msida, Malta
| | - Nikolai Paul Pace
- Centre for Molecular Medicine and Biobanking, Faculty of Medicine and Surgery, University of Malta, Msida, Malta
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19
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Tian C, Gao L, Zucker IH. Regulation of Nrf2 signaling pathway in heart failure: Role of extracellular vesicles and non-coding RNAs. Free Radic Biol Med 2021; 167:218-231. [PMID: 33741451 PMCID: PMC8096694 DOI: 10.1016/j.freeradbiomed.2021.03.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/26/2021] [Accepted: 03/11/2021] [Indexed: 12/11/2022]
Abstract
The balance between pro- and antioxidant molecules has been established as an important driving force in the pathogenesis of cardiovascular disease. Chronic heart failure is associated with oxidative stress in the myocardium and globally. Redox balance in the heart and brain is controlled, in part, by antioxidant proteins regulated by the transcription factor Nuclear factor erythroid 2-related factor 2 (Nrf2), which is reduced in the heart failure state. Nrf2 can, in turn, be regulated by a variety of mechanisms including circulating microRNAs (miRNAs) encapsulated in extracellular vesicles (EVs) derived from multiple cell types in the heart. Here, we review the role of the Nrf2 and antioxidant enzyme signaling pathway in mediating redox balance in the myocardium and the brain in the heart failure state. This review focuses on Nrf2 and antioxidant protein regulation in the heart and brain by miRNA-enriched EVs in the setting of heart failure. We discuss EV-mediated intra- and inter-organ communications especially, communication between the heart and brain via an EV pathway that mediates cardiac function and sympatho-excitation in heart failure. Importantly, we speculate how engineered EVs with specific miRNAs or antagomirs may be used in a therapeutic manner in heart failure.
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Affiliation(s)
- Changhai Tian
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, 68198-5880, USA
| | - Lie Gao
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, 68198-5850, USA
| | - Irving H Zucker
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, 68198-5850, USA.
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20
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Bhopale VM, Ruhela D, Brett KD, Nugent NZ, Fraser NK, Levinson SL, DiNubile MJ, Thom SR. Plasma gelsolin modulates the production and fate of IL-1β-containing microparticles following high-pressure exposure and decompression. J Appl Physiol (1985) 2021; 130:1604-1613. [PMID: 33764168 DOI: 10.1152/japplphysiol.01062.2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Plasma gelsolin (pGSN) levels fall in association with diverse inflammatory conditions. We hypothesized that pGSN would decrease due to the stresses imposed by high pressure and subsequent decompression, and repletion would ameliorate injuries in a murine decompression sickness (DCS) model. Research subjects were found to exhibit a modest decrease in pGSN level while at high pressure and a profound decrease after decompression. Changes occurred concurrent with elevations of circulating microparticles (MPs) carrying interleukin (IL)-1β. Mice exhibited a comparable decrease in pGSN after decompression along with elevations of MPs carrying IL-1β. Infusion of recombinant human (rhu)-pGSN into mice before or after pressure exposure abrogated these changes and prevented capillary leak in brain and skeletal muscle. Human and murine MPs generated under high pressure exhibited surface filamentous actin (F-actin) to which pGSN binds, leading to particle lysis. In addition, human neutrophils exposed to high air pressure exhibit an increase in surface F-actin that is diminished by rhu-pGSN resulting in inhibition of MP production. Administration of rhu-pGSN may have benefit as prophylaxis or treatment for DCS.NEW & NOTEWORTHY Inflammatory microparticles released in response to high pressure and decompression express surface filamentous actin. Infusion of recombinant human plasma gelsolin lyses these particles in decompressed mice and ameliorates particle-associated vascular damage. Human neutrophils also respond to high pressure with an increase in surface filamentous actin and microparticle production, and these events are inhibited by plasma gelsolin. Gelsolin infusion may have benefit as prophylaxis or treatment for decompression sickness.
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Affiliation(s)
- Veena M Bhopale
- University of Maryland School of Medicine, Baltimore, Maryland
| | - Deepa Ruhela
- University of Maryland School of Medicine, Baltimore, Maryland
| | | | | | | | | | | | - Stephen R Thom
- University of Maryland School of Medicine, Baltimore, Maryland
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21
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Gaspar RS, Ferreira PM, Mitchell JL, Pula G, Gibbins JM. Platelet-derived extracellular vesicles express NADPH oxidase-1 (Nox-1), generate superoxide and modulate platelet function. Free Radic Biol Med 2021; 165:395-400. [PMID: 33548451 PMCID: PMC7985666 DOI: 10.1016/j.freeradbiomed.2021.01.051] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 01/14/2021] [Accepted: 01/29/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Platelets release platelet-derived extracellular vesicles (PDEVs) upon activation - in a process that is regulated by generation of reactive oxygen species (ROS). Platelet NADPH oxidase-1 (Nox-1) contributes to ROS generation and thrombus formation downstream of the collagen receptor GPVI. OBJECTIVES We aimed to investigate whether PDEVs contain Nox-1 and whether this is relevant for PDEV-induced platelet activation. METHODS PDEVs were isolated through serial centrifugation after platelet activation with thrombin receptor agonist TRAP-6 (activated PDEVs) or in the absence of agonist (resting PDEVs). The physical properties of PDEVs were analyzed through nanoparticle tracking analysis. Nox-1 levels, fibrinogen binding and P-selectin exposure were measured using flow cytometry, and protein levels quantified by immunoblot analysis. ROS were quantified using DCF fluorescence and electron paramagnetic resonance. RESULTS Nox-1 was found to be increased on the platelet outer membrane upon activation and was present in PDEVs. PDEVs induced platelet activation, while co-addition of GPVI agonist collagen-related peptide (CRP) did not potentiate this response. PDEVs were shown to be able to generate superoxide in a process at least partially mediated by Nox-1, while Nox-1 inhibition with ML171 (also known as 2-APT) did not influence PDEV production. Finally, inhibition of Nox-1 abrogated PDEV-mediated platelet activation. CONCLUSIONS PDEVs are able to generate superoxide, bind to and activate platelets in a process mediated by Nox-1. These data provide novel mechanisms by which Nox-1 potentiates platelet responses, thus proposing Nox-1 inhibition as a feasible strategy to treat and prevent thrombotic diseases.
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Affiliation(s)
- Renato Simões Gaspar
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK.
| | - Plinio M Ferreira
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Joanne L Mitchell
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Giordano Pula
- University Medical Center Eppendorf Hamburg, Institute for Clinical Chemistry and Laboratory Medicine, Hamburg, Germany
| | - Jonathan M Gibbins
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
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22
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Bhatt S, Kanoujia J, Dhar AK, Arumugam S, Silva AKA, Mishra N. Exosomes: A Novel Therapeutic Paradigm for the Treatment of Depression. Curr Drug Targets 2021; 22:183-191. [PMID: 33023431 DOI: 10.2174/1389450121999201006193005] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 08/21/2020] [Accepted: 08/31/2020] [Indexed: 11/22/2022]
Abstract
Extracellular vesicles (EVs) of endocytic origin are known as exosomes. These vesicles are released by cells and are found in biofluids, such as saliva, urine, and plasma. These vesicles are made up of small RNA, DNA, proteins, and play a vital role in many physiological processes. In the central nervous system (CNS), they participate in various physiological processes such as stress of nerve cells, communication between the cells, synaptic plasticity, and neurogenesis. The role of exosomes in depression needs to be explored further. It is known that exosomes can cross the blood brain barrier (BBB), which is made up of glial cells astrocytes. One of the advantages of these vesicles is that they are able to transfer macromolecules like DNA, protein, mRNAs, and miRNAs to recipient cells. This review focuses on the potential role of exosomes in depression and their utilization as a treatment option or diagnostic tool of depression.
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Affiliation(s)
- Shvetank Bhatt
- Amity Institute of Pharmacy, Amity University Madhya Pradesh (AUMP), Gwalior-474005, India
| | - Jovita Kanoujia
- Amity Institute of Pharmacy, Amity University Madhya Pradesh (AUMP), Gwalior-474005, India
| | - Arghya Kusum Dhar
- School of Pharmacy, Neotia University, Sarisa, D.H road, 24 pgs(south), West Bengal 743368, India
| | - Surendar Arumugam
- Laboratoire Matiere et Systemes Complexes (MSC), Universite de Paris, UMR 7057 CNRS, 75205 Paris cedex 13, France
| | - Amanda K A Silva
- Laboratoire Matiere et Systemes Complexes (MSC), Universite de Paris, UMR 7057 CNRS, 75205 Paris cedex 13, France
| | - Neeraj Mishra
- Amity Institute of Pharmacy, Amity University Madhya Pradesh (AUMP), Gwalior-474005, India
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23
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Wang R, Li J, Zhang X, Zhang X, Zhang X, Zhu Y, Chen C, Liu Z, Wu X, Wang D, Dongye M, Wang J, Lin H. Extracellular vesicles promote epithelial-to-mesenchymal transition of lens epithelial cells under oxidative stress. Exp Cell Res 2020; 398:112362. [PMID: 33221317 DOI: 10.1016/j.yexcr.2020.112362] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 11/01/2020] [Accepted: 11/03/2020] [Indexed: 12/21/2022]
Abstract
Posterior capsule opacification (PCO), resulting from residual lens epithelial cell (LEC) epithelial-mesenchymal transition (EMT), abnormal proliferation, and migration, is the most common complication of cataract surgery. A recent study determined that extracellular vesicles (EVs) and reactive oxygen species (ROS) regulate the EMT process during cutaneous wound healing and tumour metastasis. However, their underlying mechanism in PCO is unclear. In this study, we examined the secreted EVs from a scratch model in vitro. We found that the production of ROS was increased after mechanical injury, especially at the wound edge, and there was an increased viability of LECs, which can be blocked by diphenyleneiodonium, an NADPH oxidase inhibitor. Cell viability and migration were increased upon treatment with 1 μM H2O2, but significantly reduced when the concentration of H2O2 increased to 100 μM. Transwell assay showed that both post-surgery LECs and LECs treated with 1 μM H2O2 significantly induced the migration of normal LECs by EV secretion. Extraction and quantification of EVs derived from injured and H2O2-treated LECs showed a similar increase in production. Co-incubation of EVs from both injured and H2O2-treated LECs with normal LECs and organ-cultured mouse lenses activated EMT, which was attenuated by a ROS inhibitor. These results suggest that EVs participate in ROS-induced lens EMT, making EVs a potential target for treating PCO.
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Affiliation(s)
- Ruixin Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Jianbing Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Xiayin Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Xulin Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Xinyu Zhang
- Sun Yat-sen University Cancer Center, Guangzhou, 510060, China
| | - Yi Zhu
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Chuan Chen
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Zhenzhen Liu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Xiaohang Wu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Dongni Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Meimei Dongye
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Jinghui Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China
| | - Haotian Lin
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China.
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Schirato SR, El-Dash I, El-Dash V, Bizzarro B, Marroni A, Pieri M, Cialoni D, Chaui-Berlinck JG. Association Between Heart Rate Variability and Decompression-Induced Physiological Stress. Front Physiol 2020; 11:743. [PMID: 32714210 PMCID: PMC7351513 DOI: 10.3389/fphys.2020.00743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 06/08/2020] [Indexed: 01/09/2023] Open
Abstract
The purpose of this study was to analyze the correlation between decompression-related physiological stress markers, given by inflammatory processes and immune system activation and changes in Heart Rate Variability, evaluating whether Heart Rate Variability can be used to estimate the physiological stress caused by the exposure to hyperbaric environments and subsequent decompression. A total of 28 volunteers participated in the experimental protocol. Electrocardiograms were performed; blood samples were obtained for the quantification of red cells, hemoglobin, hematocrit, neutrophils, lymphocytes, platelets, aspartate transaminase (AST), alanine aminotransferase (ALT), and for immunophenotyping and microparticles (MP) research through Flow Cytometry, before and after each experimental protocol from each volunteer. Also, myeloperoxidase (MPO) expression and microparticles (MPs) deriving from platelets, neutrophils and endothelial cells were quantified. Negative associations between the standard deviation of normal-to-normal intervals (SDNN) in the time domain, the High Frequency in the frequency domain and the total number of circulating microparticles was observed (p-value = 0.03 and p-value = 0.02, respectively). The pre and post exposure ratio of variation in the number of circulating microparticles was negatively correlated with SDNN (p-value = 0.01). Additionally, a model based on the utilization of Radial Basis Function Neural Networks (RBF-NN) was created and was able to predict the SDNN ratio of variation based on the variation of specific inflammatory markers (RMSE = 0.06).
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Affiliation(s)
- Sergio Rhein Schirato
- Department of Physiology, Biosciences Institute, University of São Paulo, São Paulo, Brazil
| | - Ingrid El-Dash
- Department of Physiology, Biosciences Institute, University of São Paulo, São Paulo, Brazil
| | - Vivian El-Dash
- Department of Physiology, Biosciences Institute, University of São Paulo, São Paulo, Brazil
| | - Bruna Bizzarro
- Peter Murányi Experimental Research Center, Albert Einstein Hospital, São Paulo, Brazil
| | | | - Massimo Pieri
- DAN Europe Research Division, Roseto degli Abruzzi, Italy
| | - Danilo Cialoni
- DAN Europe Research Division, Roseto degli Abruzzi, Italy
- Environmental Physiology and Medicine Laboratory, Department of Biomedical Sciences, University of Padova, Padua, Italy
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Ruhela D, Bhopale VM, Yang M, Yu K, Weintraub E, Greenblatt A, Thom SR. Blood-borne and brain-derived microparticles in morphine-induced anti-nociceptive tolerance. Brain Behav Immun 2020; 87:465-472. [PMID: 32001343 DOI: 10.1016/j.bbi.2020.01.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 01/06/2020] [Accepted: 01/24/2020] [Indexed: 01/08/2023] Open
Abstract
We hypothesized that elevations of microparticles (MPs) would occur with morphine administration to mice. Repetitive dosing to induce anti-nociceptive tolerance increases blood-borne MPs by 8-fold, and by 10-fold in deep cervical lymph nodes draining brain glymphatics. MPs express proteins specific to cells including neutrophils, microglia, astrocytes, neurons and oligodendrocytes. Interleukin (IL)-1β content of MPs increases 68-fold. IL-1β antagonist administration diminishes blood-borne and cervical lymph node MPs, and abrogates tolerance induction. Intravenous polyethylene glycol Telomer B, a surfactant that lyses MPs, and intraperitoneal methylnaltrexone also inhibit MPs elevations and tolerance. Critically, neutropenic mice do not develop anti-nociceptive tolerance, elevations of blood-borne or cervical node MPs. Immunohistochemical evidence for microglial activation by morphine does not correlated with the MPs response pattern. Neutrophil-derived MPs appear to be required for morphine-induced anti-nociceptive tolerance. Further, patients entering treatment for opioid use disorder exhibit similar MPs elevations as do tolerant mice.
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Affiliation(s)
| | | | - Ming Yang
- Department of Emergency Medicine, United States
| | - Kevin Yu
- Department of Emergency Medicine, United States
| | - Eric Weintraub
- Department of Psychiatry, University of Maryland, School of Medicine, United States
| | - Aaron Greenblatt
- Department of Psychiatry, University of Maryland, School of Medicine, United States
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Louzada RA, Bouviere J, Matta LP, Werneck-de-Castro JP, Dupuy C, Carvalho DP, Fortunato RS. Redox Signaling in Widespread Health Benefits of Exercise. Antioxid Redox Signal 2020; 33:745-760. [PMID: 32174127 DOI: 10.1089/ars.2019.7949] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Significance: Exercise-induced reactive oxygen species (ROS) production activates multiple intracellular signaling pathways through genomic and nongenomic mechanisms that are responsible for the beneficial effects of exercise in muscle. Beyond the positive effect of exercise on skeletal muscle cells, other tissues such as white and brown adipose, liver, central nervous system, endothelial, heart, and endocrine organ tissues are also responsive to exercise. Recent Advances: Crosstalk between different cells is essential to achieve homeostasis and to promote the benefits of exercise through paracrine or endocrine signaling. This crosstalk can be mediated by different effectors that include the secretion of metabolites of muscle contraction, myokines, and exosomes. During the past 20 years, it has been demonstrated that contracting muscle cells produce and secrete different classes of myokines, which functionally link muscle with nearly all other cell types. Critical Issues: The redox signaling behind this exercise-induced crosstalk is now being decoded. Many of these widespread beneficial effects of exercise require not only a complex ROS-dependent intramuscular signaling cascade but simultaneously, an integrated network with many remote tissues. Future Directions: Strong evidence suggests that the powerful beneficial effect of regular physical activity for preventing (or treating) a large range of disorders might also rely on ROS-mediated signaling. Within a contracting muscle, ROS signaling may control exosomes and myokines secretion. In remote tissues, exercise generates regular and synchronized ROS waves, creating a transient pro-oxidative environment in many cells. These new concepts integrate exercise, ROS-mediated signaling, and the widespread health benefits of exercise.
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Affiliation(s)
- Ruy A Louzada
- Institut of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- Université Paris-Sud, Orsay, UMR 8200 CNRS and Institut Gustave Roussy, Villejuif, France
| | - Jessica Bouviere
- Institut of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leonardo P Matta
- Institut of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Joao Pedro Werneck-de-Castro
- Division of Endocrinology, Diabetes and Metabolism, Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - Corinne Dupuy
- Université Paris-Sud, Orsay, UMR 8200 CNRS and Institut Gustave Roussy, Villejuif, France
| | - Denise P Carvalho
- Institut of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rodrigo S Fortunato
- Institut of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Ciarlone GE, Hinojo CM, Stavitzski NM, Dean JB. CNS function and dysfunction during exposure to hyperbaric oxygen in operational and clinical settings. Redox Biol 2019; 27:101159. [PMID: 30902504 PMCID: PMC6859559 DOI: 10.1016/j.redox.2019.101159] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 02/20/2019] [Accepted: 03/01/2019] [Indexed: 12/26/2022] Open
Abstract
Hyperbaric oxygen (HBO2) is breathed during hyperbaric oxygen therapy and during certain undersea pursuits in diving and submarine operations. What limits exposure to HBO2 in these situations is the acute onset of central nervous system oxygen toxicity (CNS-OT) following a latent period of safe oxygen breathing. CNS-OT presents as various non-convulsive signs and symptoms, many of which appear to be of brainstem origin involving cranial nerve nuclei and autonomic and cardiorespiratory centers, which ultimately spread to higher cortical centers and terminate as generalized tonic-clonic seizures. The initial safe latent period makes the use of HBO2 practical in hyperbaric and undersea medicine; however, the latent period is highly variable between individuals and within the same individual on different days, making it difficult to predict onset of toxic indications. Consequently, currently accepted guidelines for safe HBO2 exposure are highly conservative. This review examines the disorder of CNS-OT and summarizes current ideas on its underlying pathophysiology, including specific areas of the CNS and fundamental neural and redox signaling mechanisms that are thought to be involved in seizure genesis and propagation. In addition, conditions that accelerate the onset of seizures are discussed, as are current mitigation strategies under investigation for neuroprotection against redox stress while breathing HBO2 that extend the latent period, thus enabling safer and longer exposures for diving and medical therapies.
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Affiliation(s)
- Geoffrey E Ciarlone
- Undersea Medicine Department, Naval Medical Research Center, 503 Robert Grant Ave., Silver Spring, MD, USA
| | - Christopher M Hinojo
- Department of Molecular Pharmacology and Physiology, Hyperbaric Biomedical Research Laboratory, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Nicole M Stavitzski
- Department of Molecular Pharmacology and Physiology, Hyperbaric Biomedical Research Laboratory, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Jay B Dean
- Department of Molecular Pharmacology and Physiology, Hyperbaric Biomedical Research Laboratory, Morsani College of Medicine, University of South Florida, Tampa, FL, USA.
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Microparticle and interleukin-1β production with human simulated compressed air diving. Sci Rep 2019; 9:13320. [PMID: 31527725 PMCID: PMC6746808 DOI: 10.1038/s41598-019-49924-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 09/03/2019] [Indexed: 02/02/2023] Open
Abstract
Production of blood-borne microparticles (MPs), 0.1–1 µm diameter vesicles, and interleukin (IL)-1β in response to high pressure is reported in lab animals and associated with pathological changes. It is unknown whether the responses occur in humans, and whether they are due to exposure to high pressure or to the process of decompression. Blood from research subjects exposed in hyperbaric chambers to air pressure equal to 18 meters of sea water (msw) for 60 minutes or 30 msw for 35 minutes were obtained prior to and during compression and 2 hours post-decompression. MPs and intra-particle IL-1β elevations occurred while at pressure in both groups. At 18 msw (n = 15) MPs increased by 1.8-fold, and IL-1β by 7.0-fold (p < 0.05, repeated measures ANOVA on ranks). At 30 msw (n = 16) MPs increased by 2.5-fold, and IL-1β by 4.6-fold (p < 0.05), and elevations persisted after decompression with MPs elevated by 2.0-fold, and IL-1β by 6.0-fold (p < 0.05). Whereas neutrophils incubated in ambient air pressure for up to 3 hours ex vivo did not generate MPs, those exposed to air pressure at 180 kPa for 1 hour generated 1.4 ± 0.1 MPs/cell (n = 8, p < 0.05 versus ambient air), and 1.7 ± 0.1 MPs/cell (p < 0.05 versus ambient air) when exposed to 300 kPa for 35 minutes. At both pressures IL-1β concentration tripled (p < 0.05 versus ambient air) during pressure exposure and increased 6-fold (p < 0.05 versus ambient air) over 2 hours post-decompression. Platelets also generated MPs but at a rate about 1/100 that seen with neutrophils. We conclude that production of MPs containing elevated concentrations of IL-1β occur in humans during exposure to high gas pressures, more so than as a response to decompression. While these events may pose adverse health threats, their contribution to decompression sickness development requires further study.
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Bodega G, Alique M, Puebla L, Carracedo J, Ramírez RM. Microvesicles: ROS scavengers and ROS producers. J Extracell Vesicles 2019; 8:1626654. [PMID: 31258880 PMCID: PMC6586107 DOI: 10.1080/20013078.2019.1626654] [Citation(s) in RCA: 140] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 05/27/2019] [Accepted: 05/29/2019] [Indexed: 12/14/2022] Open
Abstract
This review analyzes the relationship between microvesicles and reactive oxygen species (ROS). This relationship is bidirectional; on the one hand, the number and content of microvesicles produced by the cells are affected by oxidative stress conditions; on the other hand, microvesicles can directly and/or indirectly modify the ROS content in the extra- as well as the intracellular compartments. In this regard, microvesicles contain a pro-oxidant or antioxidant machinery that may produce or scavenge ROS: direct effect. This mechanism is especially suitable for eliminating ROS in the extracellular compartment. Endothelial microvesicles, in particular, contain a specific and well-developed antioxidant machinery. On the other hand, the molecules included in microvesicles can modify (activate or inhibit) ROS metabolism in their target cells: indirect effect. This can be achieved by the incorporation into the cells of ROS metabolic enzymes included in the microvesicles, or by the regulation of signaling pathways involved in ROS metabolism. Proteins, as well as miRNAs, are involved in this last effect.
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Affiliation(s)
- G Bodega
- Departamento de Biomedicina y Biotecnología, Universidad de Alcalá, Alcalá de Henares, Spain
| | - M Alique
- Departamento de Biología de Sistemas, Universidad de Alcalá, Alcalá de Henares, Spain
| | - L Puebla
- Departamento de Biología de Sistemas, Universidad de Alcalá, Alcalá de Henares, Spain
| | - J Carracedo
- Departamento de Genética, Fisiología y Microbiología, Facultad de Biología, Universidad Complutense, Instituto de Investigación Sanitaria Hospital 12 de Octubre, Madrid, Spain
| | - R M Ramírez
- Departamento de Biología de Sistemas, Universidad de Alcalá, Alcalá de Henares, Spain
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Extracellular vesicles: exosomes, microparticles, their parts, and their targets to enable their biomanufacturing and clinical applications. Curr Opin Biotechnol 2019; 60:89-98. [PMID: 30851486 DOI: 10.1016/j.copbio.2019.01.005] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 01/02/2019] [Indexed: 12/21/2022]
Abstract
Extracellular vesicles (EVs) are membrane vesicles, the submicron-size microparticles and the nanometer-size exosomes, that carry RNAs, proteins and lipids from their parent cells. EV generation takes place under cellular activation or stress. Cells use EVs to communicate with other cells by delivering signals through their content and surface proteins. Beyond diagnostic and discovery applications, EVs are excellent candidates for enabling safe and potent cell and gene therapies, especially those requiring strong target specificity. Here we examine EVs, their engineering and applications by dissecting mechanistic and engineering aspects of their components that endow them with their unique capabilities: their cargo and membranes proteins. Both EV cargo and membranes can be independently engineered and used for various applications. We review early efforts for their biomanufacturing.
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Thom SR, Bhopale VM, Yang M. Microparticle-induced vascular injury in mice following decompression is inhibited by hyperbaric oxygen: effects on microparticles and interleukin-1β. J Appl Physiol (1985) 2019; 126:1006-1014. [PMID: 30763157 DOI: 10.1152/japplphysiol.01109.2018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Hyperbaric oxygen (HBO2) became a mainstay for treating decompression sickness (DCS) because bubbles are associated with the disorder. Inflammatory processes including production of circulating microparticles (MPs) have now been shown to occur with DCS, leading to questions regarding pathophysiology and the role for HBO2. We investigated effects of HBO2 on mice exposed to 790 kPa air pressure for 2 h, which triggers elevations of MPs ladened with interleukin (IL)-1β that cause diffuse vascular injuries. Exposure to 283 kPa O2 (HBO2) inhibited MP elevations at 2 h postdecompression by 50% when applied either prophylactically or as treatment after decompression, and the MP number remained suppressed for 13 h in the prophylactic group. Particle content of IL-1β at 2 h postdecompression was 139.3 ± 16.2 [means ± SE; n = 11, P < 0.05) pg/million MPs vs. 8.2 ± 1.0 ( n = 15) in control mice, whereas it was 31.5 ± 6.1 ( n = 6, not significant vs. control (NS)] in mice exposed to HBO2 prophylactically, and 16.6 ± 6.3 ( n = 7, NS) when HBO2 was administered postdecompression. IL-1β content in MPs was similar in HBO2-exposed mice at 13 h postdecompression. HBO2 also inhibited decompression-associated neutrophil activation and diffuse vascular leak. Immunoprecipitation studies demonstrated that HBO2 inhibits high-pressure-mediated neutrophil nucleotide-binding domain, leucine-rich-containing family, pyrin domain-containing-3 inflammasome oligomerization. Furthermore, MPs isolated from decompressed mice cause vascular injuries when injected into naïve mice, but if decompressed mice were exposed to HBO2 before MP harvest, vascular injuries were inhibited. We conclude that HBO2 impedes high-pressure/decompression-mediated inflammatory events by inhibiting inflammasome formation and IL-1β production. NEW & NOTEWORTHY High pressure/decompression causes vascular damage because it stimulates production of microparticles that contain high concentrations of interleukin-1β, and hyperbaric oxygen can prevent injuries.
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Affiliation(s)
- Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine , Baltimore, Maryland
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine , Baltimore, Maryland
| | - Ming Yang
- Department of Emergency Medicine, University of Maryland School of Medicine , Baltimore, Maryland
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Thom SR, Bhopale VM, Yu K, Huang W, Kane MA, Margolis DJ. Neutrophil microparticle production and inflammasome activation by hyperglycemia due to cytoskeletal instability. J Biol Chem 2017; 292:18312-18324. [PMID: 28972154 DOI: 10.1074/jbc.m117.802629] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 09/11/2017] [Indexed: 12/23/2022] Open
Abstract
Microparticles are lipid bilayer-enclosed vesicles produced by cells under oxidative stress. MP production is elevated in patients with diabetes, but the underlying cellular mechanisms are poorly understood. We hypothesized that raising glucose above the physiological level of 5.5 mm would stimulate leukocytes to produce MPs and activate the nucleotide-binding domain, leucine-rich repeat pyrin domain-containing 3 (NLRP3) inflammasome. We found that when incubated in buffer with up to 20 mm glucose, human and murine neutrophils, but not monocytes, generate progressively more MPs with high interleukin (IL)-1β content. Enhanced MP production required generation of reactive chemical species by mitochondria, NADPH oxidase, and type 2 nitric-oxide synthase (NOS-2) and resulted in S-nitrosylation of actin. Depleting cells of capon (C-terminal PDZ ligand of neuronal nitric-oxide synthase protein), apoptosis-associated speck-like protein containing C-terminal caspase recruitment domain (ASC), or pro-IL-1β prevented the hyperglycemia-induced enhancement of reactive species production, MP generation, and IL-1β synthesis. Additional components required for these responses included inositol 1,3,5-triphosphate receptors, PKC, and enhancement of filamentous-actin turnover. Numerous proteins become localized to short filamentous actin in response to S-nitrosylation, including vasodilator-stimulated phosphoprotein, focal adhesion kinase, the membrane phospholipid translocation enzymes flippase and floppase, capon, NLRP3, and ASC. We conclude that an interdependent oxidative stress response to hyperglycemia perturbs neutrophil cytoskeletal stability leading to MP production and IL-1β synthesis.
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Affiliation(s)
- Stephen R Thom
- From the Department of Emergency Medicine, School of Medicine, and
| | - Veena M Bhopale
- From the Department of Emergency Medicine, School of Medicine, and
| | - Kevin Yu
- From the Department of Emergency Medicine, School of Medicine, and
| | - Weiliang Huang
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland 21201 and
| | - Maureen A Kane
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland 21201 and
| | - David J Margolis
- the Department of Dermatology and Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Abstract
Purpose/Aim: High pressures of gases such as nitrogen enhance production of singlet oxygen. Therefore, we hypothesized that growth of non-small cell lung cancer (NSCLC) A549 cells and a human-derived NSCLC explant could be inhibited by an oxidative stress mechanism using high-pressure nitrogen. MATERIALS AND METHODS Growth of human NSCLC explants and A549 cells in Matrigel were assessed after implantation into nude mice who were exposed to elevated pressures. RESULTS Subcutaneous implant growth of NSCLC in nude mice was inhibited by a daily 78-minute protocol using nitrogen/oxygen breathing mixture such that at the maximum pressure of 2.78 atmospheres over ambient, mice breathed oxygen at normal atmospheric pressure. In vivo growth inhibition of A549 cells by high-pressure nitrogen could be abrogated in subcutaneous Matrigel implants when supplemented with 10-mM N-acetylcysteine as an antioxidant. Ex vivo A549 cell exposures exhibited elevated singlet oxygen production, and reactive oxygen species were produced for up to 4 hours after short-term high-pressure nitrogen exposure. CONCLUSIONS This pilot study demonstrates that elevated normoxic nitrogen pressure can exacerbate oxidative stress in NSCLC to inhibit growth.
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Thom SR, Bhopale VM, Hu J, Yang M. Increased carbon dioxide levels stimulate neutrophils to produce microparticles and activate the nucleotide-binding domain-like receptor 3 inflammasome. Free Radic Biol Med 2017; 106:406-416. [PMID: 28288918 DOI: 10.1016/j.freeradbiomed.2017.03.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 02/22/2017] [Accepted: 03/08/2017] [Indexed: 11/22/2022]
Abstract
We hypothesized that elevations of carbon dioxide (CO2) commonly found in modern buildings will stimulate leukocytes to produce microparticles (MPs) and activate the nucleotide-binding domain-like receptor 3 (NLRP3) inflammasome due to mitochondrial oxidative stress. Human and murine neutrophils generate MPs with high interleukin-1β (IL-1β) content when incubated ex vivo in buffer equilibrated with 0.1-0.4% additional CO2. Enhanced MPs production requires mitochondrial reactive oxygen species production, which is mediated by activities of pyruvate carboxylase and phosphoenolpyruvate carboxykinase. Subsequent events leading to MPs generation include perturbation of inositol 1,3,5-triphosphate receptors, a transient elevation of intracellular calcium, activation of protein kinase C and NADPH oxidase (Nox). Concomitant activation of type-2 nitric oxide synthase yields secondary oxidants resulting in actin S-nitrosylation and enhanced filamentous actin turnover. Numerous proteins are linked to short filamentous actin including vasodilator-stimulated phosphoprotein, focal adhesion kinase, the membrane phospholipid translocation enzymes flippase and floppase, and the critical inflammasome protein ASC (Apoptosis-associated Speck protein with CARD domain). Elevations of CO2 cause oligomerization of the inflammasome components ASC, NLRP3, caspase 1, thioredoxin interacting protein, and calreticulin - a protein from endoplasmic reticulum, leading to IL-1β synthesis. An increased production rate of MPs containing elevated amounts of IL-1β persists for hours after short-term exposures to elevated CO2.
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Affiliation(s)
- Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - JingPing Hu
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - Ming Yang
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
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Kumar A, Stoica BA, Loane DJ, Yang M, Abulwerdi G, Khan N, Kumar A, Thom SR, Faden AI. Microglial-derived microparticles mediate neuroinflammation after traumatic brain injury. J Neuroinflammation 2017; 14:47. [PMID: 28292310 PMCID: PMC5351060 DOI: 10.1186/s12974-017-0819-4] [Citation(s) in RCA: 216] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 02/18/2017] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Local and systemic inflammatory responses are initiated early after traumatic brain injury (TBI), and may play a key role in the secondary injury processes resulting in neuronal loss and neurological deficits. However, the mechanisms responsible for the rapid expansion of neuroinflammation and its long-term progression have yet to be elucidated. Here, we investigate the role of microparticles (MP), a member of the extracellular vesicle family, in the exchange of pro-inflammatory molecules between brain immune cells, as well as their transfer to the systemic circulation, as key pathways of inflammation propagation following brain trauma. METHODS Adult male C57BL/6 mice were subjected to controlled cortical impact TBI for 24 h, and enriched MP were isolated in the blood, while neuroinflammation was assessed in the TBI cortex. MP were characterized by flow cytometry, and MP content was assayed using gene and protein markers for pro-inflammatory mediators. Enriched MP co-cultured with BV2 or primary microglial cells were used for immune propagation assays. Enriched MP from BV2 microglia or CD11b-positive microglia from the TBI brain were stereotactically injected into the cortex of uninjured mice to evaluate MP-related seeding of neuroinflammation in vivo. RESULTS As the neuroinflammatory response is developing in the brain after TBI, microglial-derived MP are released into the circulation. Circulating enriched MP from the TBI animals can activate microglia in vitro. Lipopolysaccharide stimulation increases MP release from microglia in vitro and enhances their content of pro-inflammatory mediators, interleukin-1β and microRNA-155. Enriched MP from activated microglia in vitro or CD11b-isolated microglia/macrophage from the TBI brain ex vivo are sufficient to initiate neuroinflammation following their injection into the cortex of naïve (uninjured) animals. CONCLUSIONS These data provide further insights into the mechanisms underlying the development and dissemination of neuroinflammation after TBI. MP loaded with pro-inflammatory molecules initially released by microglia following trauma can activate additional microglia that may contribute to progressive neuroinflammatory response in the injured brain, as well as stimulate systemic immune responses. Due to their ability to independently initiate inflammatory responses, MP derived from activated microglia may provide a potential therapeutic target for other neurological disorders in which neuroinflammation may be a contributing factor.
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Affiliation(s)
- Alok Kumar
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA.,Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Health Sciences Facility II (HSFII), #S247 20 Penn Street, Baltimore, MD, 21201, USA
| | - Bogdan A Stoica
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA.,Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Health Sciences Facility II (HSFII), #S247 20 Penn Street, Baltimore, MD, 21201, USA
| | - David J Loane
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA.,Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Health Sciences Facility II (HSFII), #S247 20 Penn Street, Baltimore, MD, 21201, USA
| | - Ming Yang
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Gelareh Abulwerdi
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA.,Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Health Sciences Facility II (HSFII), #S247 20 Penn Street, Baltimore, MD, 21201, USA
| | - Niaz Khan
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA.,Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Health Sciences Facility II (HSFII), #S247 20 Penn Street, Baltimore, MD, 21201, USA
| | - Asit Kumar
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA.,Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Health Sciences Facility II (HSFII), #S247 20 Penn Street, Baltimore, MD, 21201, USA
| | - Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Alan I Faden
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA. .,Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Health Sciences Facility II (HSFII), #S247 20 Penn Street, Baltimore, MD, 21201, USA.
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Bhullar J, Bhopale VM, Yang M, Sethuraman K, Thom SR. Microparticle formation by platelets exposed to high gas pressures - An oxidative stress response. Free Radic Biol Med 2016; 101:154-162. [PMID: 27751909 DOI: 10.1016/j.freeradbiomed.2016.10.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 10/10/2016] [Accepted: 10/13/2016] [Indexed: 02/05/2023]
Abstract
This investigation explored the mechanism for microparticles (MPs) production by human and murine platelets exposed to high pressures of inert gases. Results demonstrate that MPs production occurs via an oxidative stress response in a dose-dependent manner and follows the potency series N2>Ar>He. Gases with higher van der Waals volumes or polarizability such as SF6 and N2O, or hydrostatic pressure, do not cause MPs production. Singlet O2 is generated by N2, Ar and He, which is linked to NADPH oxidase (NOX) activity. Progression of oxidative stress involves activation of nitric oxide synthase (NOS) leading to S-nitrosylation of cytosolic actin. Exposure to gases enhances actin filament turnover and associations between short actin filaments, NOS, vasodilator-stimulated phosphoprotein (VASP), focal adhesion kinase (FAK) and Rac1. Inhibition of NOS or NOX by chemical inhibitors or using platelets from mice lacking NOS2 or the gp91phox component of NOX diminish generation of reactive species, enhanced actin polymerization and MP generation by high pressure gases. We conclude that by initiating a sequence of progressive oxidative stress responses high pressure gases cause platelets to generate MPs.
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Affiliation(s)
- Jasjeet Bhullar
- Department of Emergency Medicine, University of Maryland, Baltimore, MD 21201, United States
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland, Baltimore, MD 21201, United States
| | - Ming Yang
- Department of Emergency Medicine, University of Maryland, Baltimore, MD 21201, United States
| | - Kinjal Sethuraman
- Department of Emergency Medicine, University of Maryland, Baltimore, MD 21201, United States
| | - Stephen R Thom
- Department of Emergency Medicine, University of Maryland, Baltimore, MD 21201, United States.
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Dynamic microvesicle release and clearance within the cardiovascular system: triggers and mechanisms. Clin Sci (Lond) 2015; 129:915-31. [PMID: 26359252 DOI: 10.1042/cs20140623] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Interest in cell-derived microvesicles (or microparticles) within cardiovascular diagnostics and therapeutics is rapidly growing. Microvesicles are often measured in the circulation at a single time point. However, it is becoming clear that microvesicle levels both increase and decrease rapidly in response to certain stimuli such as hypoxia, acute cardiac stress, shear stress, hypertriglyceridaemia and inflammation. Consequently, the levels of circulating microvesicles will reflect the balance between dynamic mechanisms for release and clearance. The present review describes the range of triggers currently known to lead to microvesicle release from different cellular origins into the circulation. Specifically, the published data are used to summarize the dynamic impact of these triggers on the degree and rate of microvesicle release. Secondly, a summary of the current understanding of microvesicle clearance via different cellular systems, including the endothelial cell and macrophage, is presented, based on reported studies of clearance in experimental models and clinical scenarios, such as transfusion or cardiac stress. Together, this information can be used to provide insights into potential underlying biological mechanisms that might explain the increases or decreases in circulating microvesicle levels that have been reported and help to design future clinical studies.
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Thom SR, Bennett M, Banham ND, Chin W, Blake DF, Rosen A, Pollock NW, Madden D, Barak O, Marroni A, Balestra C, Germonpre P, Pieri M, Cialoni D, Le PNJ, Logue C, Lambert D, Hardy KR, Sward D, Yang M, Bhopale VB, Dujic Z. Association of microparticles and neutrophil activation with decompression sickness. J Appl Physiol (1985) 2015; 119:427-34. [DOI: 10.1152/japplphysiol.00380.2015] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 06/30/2015] [Indexed: 01/10/2023] Open
Abstract
Decompression sickness (DCS) is a systemic disorder, assumed due to gas bubbles, but additional factors are likely to play a role. Circulating microparticles (MPs)—vesicular structures with diameters of 0.1-1.0 μm—have been implicated, but data in human divers have been lacking. We hypothesized that the number of blood-borne, Annexin V-positive MPs and neutrophil activation, assessed as surface MPO staining, would differ between self-contained underwater breathing-apparatus divers suffering from DCS vs. asymptomatic divers. Blood was analyzed from 280 divers who had been exposed to maximum depths from 7 to 105 meters; 185 were control/asymptomatic divers, and 90 were diagnosed with DCS. Elevations of MPs and neutrophil activation occurred in all divers but normalized within 24 h in those who were asymptomatic. MPs, bearing the following proteins: CD66b, CD41, CD31, CD142, CD235, and von Willebrand factor, were between 2.4- and 11.7-fold higher in blood from divers with DCS vs. asymptomatic divers, matched for time of sample acquisition, maximum diving depth, and breathing gas. Multiple logistic regression analysis documented significant associations ( P < 0.001) between DCS and MPs and for neutrophil MPO staining. Effect estimates were not altered by gender, body mass index, use of nonsteroidal anti-inflammatory agents, or emergency oxygen treatment and were modestly influenced by divers' age, choice of breathing gas during diving, maximum diving depth, and whether repetitive diving had been performed. There were no significant associations between DCS and number of MPs without surface proteins listed above. We conclude that MP production and neutrophil activation exhibit strong associations with DCS.
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Affiliation(s)
- Stephen R. Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Michael Bennett
- Department of Diving and Hyperbaric Medicine, Prince of Wales Hospital, New South Wales, Australia
| | - Neil D. Banham
- Department of Hyperbaric Medicine, Fiona Stanley Hospital, Perth, Western Australia
| | - Walter Chin
- Department of Hyperbaric Medicine, University of California Los Angeles Medical Center, Los Angeles, California
| | - Denise F. Blake
- Department of Emergency Medicine, The Townsville Hospital and College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia
| | - Anders Rosen
- Sahlgrenska University Hospital/Omrade2, Gothenburg, Sweden
| | | | - Dennis Madden
- Department of Integrative Physiology, University of Split School of Medicine, Soltanska, Split, Croatia
| | - Otto Barak
- Department of Integrative Physiology, University of Split School of Medicine, Soltanska, Split, Croatia
| | - Alessandro Marroni
- Divers Alert Network Europe Foundation and Diving Safety Laboratory, Roseto, Italy
| | - Costantino Balestra
- Divers Alert Network Europe Foundation and Diving Safety Laboratory, Roseto, Italy
- Environmental, Occupational, Ageing and Integrative Physiology Laboratory, Haute Ecole Paul-Henri Spaak, Brussels, Belgium
| | - Peter Germonpre
- Centre for Hyperbaric Oxygen Therapy, Military Hospital Brussels, Brussels, Belgium; and
| | - Massimo Pieri
- Divers Alert Network Europe Foundation and Diving Safety Laboratory, Roseto, Italy
| | - Danilo Cialoni
- Divers Alert Network Europe Foundation and Diving Safety Laboratory, Roseto, Italy
| | - Phi-Nga Jeannie Le
- Department of Emergency Medicine, Pereleman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Christopher Logue
- Department of Emergency Medicine, Pereleman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - David Lambert
- Department of Emergency Medicine, Pereleman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Kevin R. Hardy
- Department of Emergency Medicine, Pereleman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Douglas Sward
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Ming Yang
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Veena B. Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Zeljko Dujic
- Department of Integrative Physiology, University of Split School of Medicine, Soltanska, Split, Croatia
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Zhang X, Tang Q, Wu L, Huang J, Chen Y. AFM visualization of cortical filaments/network under cell-bound membrane vesicles. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2225-32. [PMID: 26141051 DOI: 10.1016/j.bbamem.2015.06.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 06/16/2015] [Accepted: 06/29/2015] [Indexed: 01/08/2023]
Abstract
While circulating/plasma membrane vesicles have been extensively characterized, due to the lack of effective methods cell-bound membrane vesicles are poorly understood including their shape and correlation with the intracellular cytoskeleton. In this study, we focused on cell-bound membrane vesicles and individual vesicle-derived pits on endothelial cells by using confocal microscopy and atomic force microscopy (AFM). For the first time, we found that cell-bound membrane vesicles are hemisphere-shaped and that the actin cortical filaments/network lies at the cytosolic opening of a vesicle instead of being closely attached to the inner side of the vesicle membrane. This structure of cell-bound membrane vesicles may be beneficial to their movement in, or release from, the plasma membrane of cells due to less membrane-cytoskeleton coupling to be broken therefore probably minimizing energy consumption and time usage. Further study indicates that TNF-α activation induced a significant increase in average number/size of cell-bound vesicles and the local disruption of the actin network at the cytosolic opening of cell-bound vesicles.
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Affiliation(s)
- Xiaojun Zhang
- Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, P. R. China
| | - Qisheng Tang
- Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, P. R. China
| | - Li Wu
- School of Basic Medical Sciences, Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi 330025, P. R. China
| | - Jie Huang
- The Third Hospital of Jiujiang, Jiujiang, Jiangxi 332000, P. R. China
| | - Yong Chen
- Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, P. R. China.
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Effects of helium on inflammatory and oxidative stress-induced endothelial cell damage. Exp Cell Res 2015; 337:37-43. [PMID: 26096659 DOI: 10.1016/j.yexcr.2015.06.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 06/08/2015] [Accepted: 06/10/2015] [Indexed: 11/22/2022]
Abstract
Helium induces preconditioning in human endothelium protecting against postischemic endothelial dysfunction. Circulating endothelial microparticles are markers of endothelial dysfunction derived in response to injury. Another noble gas, xenon, protected human umbilical vein endothelial cells (HUVEC) against inflammatory stress in vitro. We hypothesised that helium protects the endothelium in vitro against inflammatory and oxidative stress. HUVEC were isolated from fresh umbilical cords and grown upon confluence. Cells were subjected to starving medium for 12h before the experiment and treated for either 3 × 5 min or 1 × 30 min with helium (5% CO2, 25% O2, 70% He) or control gas (5% CO2, 25% O2, 70% N2) in a specialised gas chamber. Subsequently, cells were stimulated with TNF-α (40 ng/ml for 24h or 10 ng/ml for 2h) or H2O2 (500 μM for 2h) or left untreated. Adhesion molecule expression was analysed using real-time quantitative polymerase chain reaction. Caspase-3 expression and viability of the cells was measured by flowcytometry. Microparticles were investigated by nanoparticle tracking analysis. Helium had no effect on adhesion molecule expression after TNF-α stimulation but in combination with oxidative stress decreased cell viability (68.9 ± 1.3% and 58 ± 1.9%) compared to control. Helium further increased TNF-α induced release of caspase-3 containing particles compared to TNF-α alone (6.4 × 10(6) ± 1.1 × 10(6) and 2.9 × 10(6) ± 0.7 × 10(6), respectively). Prolonged exposure of helium increased microparticle formation (2.4 × 10(9) ± 0.5 × 10(9)) compared to control (1.7 × 10(9) ± 0.2 × 10(9)). Summarized, helium increases inflammatory and oxidative stress-induced endothelial damage and is thus not biologically inert. A possible noxious effects on the cellular level causing alterations in microparticle formation both in number and content should be acknowledged.
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Yang M, Barak OF, Dujic Z, Madden D, Bhopale VM, Bhullar J, Thom SR. Ascorbic acid supplementation diminishes microparticle elevations and neutrophil activation following SCUBA diving. Am J Physiol Regul Integr Comp Physiol 2015; 309:R338-44. [PMID: 26084697 DOI: 10.1152/ajpregu.00155.2015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 06/09/2015] [Indexed: 11/22/2022]
Abstract
Predicated on evidence that diving-related microparticle generation is an oxidative stress response, this study investigated the role that oxygen plays in augmenting production of annexin V-positive microparticles associated with open-water SCUBA diving and whether elevations can be abrogated by ascorbic acid. Following a cross-over study design, 14 male subjects ingested placebo and 2-3 wk later ascorbic acid (2 g) daily for 6 days prior to performing either a 47-min dive to 18 m of sea water while breathing air (∼222 kPa N2/59 kPa O2) or breathing a mixture of 60% O2/balance N2 from a tight-fitting face mask at atmospheric pressure for 47 min (∼40 kPa N2/59 kPa O2). Within 30 min after the 18-m dive in the placebo group, neutrophil activation, and platelet-neutrophil interactions occurred, and the total number of microparticles, as well as subgroups bearing CD66b, CD41, CD31, CD142 proteins or nitrotyrosine, increased approximately twofold. No significant elevations occurred among divers after ingesting ascorbic acid, nor were elevations identified in either group after breathing 60% O2. Ascorbic acid had no significant effect on post-dive intravascular bubble production quantified by transthoracic echocardiography. We conclude that high-pressure nitrogen plays a key role in neutrophil and microparticle-associated changes with diving and that responses can be abrogated by dietary ascorbic acid supplementation.
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Affiliation(s)
- Ming Yang
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
| | - Otto F Barak
- Department of Physiology, University of Split School of Medicine, Split, Croatia
| | - Zeljko Dujic
- Department of Physiology, University of Split School of Medicine, Split, Croatia
| | - Dennis Madden
- Department of Physiology, University of Split School of Medicine, Split, Croatia
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
| | - Jasjeet Bhullar
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
| | - Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
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Yang M, Bhopale VM, Thom SR. Separating the roles of nitrogen and oxygen in high pressure-induced blood-borne microparticle elevations, neutrophil activation, and vascular injury in mice. J Appl Physiol (1985) 2015; 119:219-22. [PMID: 26048974 DOI: 10.1152/japplphysiol.00384.2015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 06/01/2015] [Indexed: 11/22/2022] Open
Abstract
An elevation in levels of circulating microparticles (MPs) due to high air pressure exposure and the associated inflammatory changes and vascular injury that occur with it may be due to oxidative stress. We hypothesized that these responses arise due to elevated partial pressures of N2 and not because of high-pressure O2. A comparison was made among high-pressure air, normoxic high-pressure N2, and high-pressure O2 in causing an elevation in circulating annexin V-positive MPs, neutrophil activation, and vascular injury by assessing the leakage of high-molecular-weight dextran in a murine model. After mice were exposed for 2 h to 790 kPa air, there were over 3-fold elevations in total circulating MPs as well as subgroups bearing Ly6G, CD41, Ter119, CD31, and CD142 surface proteins-evidence of neutrophil activation; platelet-neutrophil interaction; and vascular injury to brain, omentum, psoas, and skeletal muscles. Similar changes were found in mice exposed to high-pressure N2 using a gas mixture so that O2 partial pressure was the same as that of ambient air, whereas none of these changes occurred after exposures to 166 kPa O2, the same partial pressure that occurs during high-pressure air exposures. We conclude that N2 plays a central role in intra- and perivascular changes associated with exposure to high air pressure and that these responses appear to be a novel form of oxidative stress.
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Affiliation(s)
- Ming Yang
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Stephen R Thom
- Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland
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Bhopale VM, Yang M, Yu K, Thom SR. Factors Associated with Nitric Oxide-mediated β2 Integrin Inhibition of Neutrophils. J Biol Chem 2015; 290:17474-84. [PMID: 26032418 DOI: 10.1074/jbc.m115.651620] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Indexed: 11/06/2022] Open
Abstract
This investigation explored the mechanism for inhibition of β2 integrin adhesion molecules when neutrophils are exposed to nitric oxide ((•)NO). Roles for specific proteins were elucidated using chemical inhibitors, depletion with small inhibitory RNA, and cells from knock-out mice. Optimal inhibition occurs with exposures to a (•)NO flux of ∼ 28 nmol/min for 2 min or more, which sets up an autocatalytic cascade triggered by activating type 2 nitric-oxide synthase (NOS-2) and NADPH oxidase (NOX). Integrin inhibition does not occur with neutrophils exposed to a NOX inhibitor (Nox2ds), a NOS-2 inhibitor (1400 W), or with cells from mice lacking NOS-2 or the gp91(phox) component of NOX. Reactive species cause S-nitrosylation of cytosolic actin that enhances actin polymerization. Protein cross-linking and actin filament formation assays indicate that increased polymerization occurs because of associations involving vasodilator-stimulated phosphoprotein, focal adhesion kinase, and protein-disulfide isomerase in proximity to actin filaments. These effects were inhibited in cells exposed to ultraviolet light which photo-reverses S-nitrosylated cysteine residues and by co-incubations with cytochalasin D. The autocatalytic cycle can be arrested by protein kinase G activated with 8-bromo-cyclic GMP and by a high (•)NO flux (∼ 112 nmol/min) that inactivates NOX.
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Affiliation(s)
- Veena M Bhopale
- From the Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Ming Yang
- From the Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Kevin Yu
- From the Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Stephen R Thom
- From the Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201
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Yang M, Bhopale VM, Thom SR. Ascorbic acid abrogates microparticle generation and vascular injuries associated with high-pressure exposure. J Appl Physiol (1985) 2015; 119:77-82. [PMID: 25977448 DOI: 10.1152/japplphysiol.00183.2015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 05/12/2015] [Indexed: 11/22/2022] Open
Abstract
We hypothesized that pathological changes associated with elevations in annexin V-positive microparticles (MPs) following high-pressure exposures can be abrogated by ascorbic acid in a murine model. Mice exposed for 2 h to 790-kPa air and killed at 2 or 13 h postdecompression exhibited over threefold elevations in circulating MPs, as well as subgroups bearing Ly6G, CD41, Ter119, CD31, and CD142 surface proteins. There was evidence of significant neutrophil activation, platelet-neutrophil interactions, and vascular injury to brain, omentum, psoas, and skeletal muscles assessed as leakage of high-molecular-weight dextran. Prophylactic ascorbic acid (500 mg/kg ip) administration prevented all postdecompression neutrophil changes and vascular injuries. Ascorbic acid administration immediately after decompression abrogated most changes, but evidence of vascular leakage in the brain and skeletal muscle at 13 h postdecompression persisted. No significant elevations in these parameters occurred after injection of ascorbic acid alone. The findings support the idea that MP production occurring with exposures to elevated gas pressure is an oxidative stress response and that antioxidants may offer protection from pathological effects associated with decompression.
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Affiliation(s)
- Ming Yang
- Department of Emergency Medicine, University of Maryland, Baltimore, Maryland
| | - Veena M Bhopale
- Department of Emergency Medicine, University of Maryland, Baltimore, Maryland
| | - Stephen R Thom
- Department of Emergency Medicine, University of Maryland, Baltimore, Maryland
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