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Alehossein P, Taheri M, Tayefeh Ghahremani P, Dakhlallah D, Brown CM, Ishrat T, Nasoohi S. Transplantation of Exercise-Induced Extracellular Vesicles as a Promising Therapeutic Approach in Ischemic Stroke. Transl Stroke Res 2023; 14:211-237. [PMID: 35596116 DOI: 10.1007/s12975-022-01025-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/06/2022] [Accepted: 04/15/2022] [Indexed: 11/24/2022]
Abstract
Clinical evidence affirms physical exercise is effective in preventive and rehabilitation approaches for ischemic stroke. This sustainable efficacy is independent of cardiovascular risk factors and associates substantial reprogramming in circulating extracellular vesicles (EVs). The intricate journey of pluripotent exercise-induced EVs from parental cells to the whole-body and infiltration to cerebrovascular entity offers several mechanisms to reduce stroke incidence and injury or accelerate the subsequent recovery. This review delineates the potential roles of EVs as prospective effectors of exercise. The candidate miRNA and peptide cargo of exercise-induced EVs with both atheroprotective and neuroprotective characteristics are discussed, along with their presumed targets and pathway interactions. The existing literature provides solid ground to hypothesize that the rich vesicles link exercise to stroke prevention and rehabilitation. However, there are several open questions about the exercise stressors which may optimally regulate EVs kinetic and boost brain mitochondrial adaptations. This review represents a novel perspective on achieving brain fitness against stroke through transplantation of multi-potential EVs generated by multi-parental cells, which is exceptionally reachable in an exercising body.
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Affiliation(s)
- Parsa Alehossein
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Daneshjoo Blvd., Chamran Hwy., PO: 19615-1178, Tehran, Iran.,School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Taheri
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Daneshjoo Blvd., Chamran Hwy., PO: 19615-1178, Tehran, Iran.,Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran, Iran
| | - Pargol Tayefeh Ghahremani
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Daneshjoo Blvd., Chamran Hwy., PO: 19615-1178, Tehran, Iran
| | - Duaa Dakhlallah
- Institute of Global Health and Human Ecology, School of Sciences & Engineering, The American University of Cairo, Cairo, Egypt
| | - Candice M Brown
- Department of Neuroscience, School of Medicine, and Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Tauheed Ishrat
- Department of Anatomy and Neurobiology, School of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Sanaz Nasoohi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Daneshjoo Blvd., Chamran Hwy., PO: 19615-1178, Tehran, Iran.
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2
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Mills A, Dakhlallah D, Robinson M, Kirk A, Llavina S, Boyd JW, Chantler PD, Olfert IM. Short-term effects of electronic cigarettes on cerebrovascular function: A time course study. Exp Physiol 2022; 107:994-1006. [PMID: 35661445 PMCID: PMC9357197 DOI: 10.1113/ep090341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 05/31/2022] [Indexed: 01/12/2023]
Abstract
NEW FINDINGS What is the central question of this study? Acute exposure to electronic cigarettes (Ecigs) triggers abnormal vascular responses in systemic arteries; however, effects on cerebral vessels are poorly understood and time for recovery is not known. We hypothesized that exposure to cigarettes or Ecigs would trigger rapid (<4 h) impairment of the middle cerebral artery (MCA) but that this would resolve by 24 h. What is the main finding and its importance? Cigarettes and Ecigs caused similar degree and duration of MCA impairment. We find it takes ~72 hours after exposure for MCA function to return to normal. This suggests that Ecig use is likely to produce similar adverse vascular health outcomes to those seen with cigarette smoke. ABSTRACT Temporal influences of electronic cigarettes (Ecigs) on blood vessels are poorly understood. In this study, we evaluated a single episode of cigarette versus Ecig exposure on middle cerebral artery (MCA) reactivity and determined how long after the exposure MCA responses took to return to normal. We hypothesized that cigarette and Ecig exposure would induce rapid (<4 h) reduction in MCA endothelial function and would resolve within 24 h. Sprague-Dawley rats (4 months old) were exposed to either air (n = 5), traditional cigarettes (20 puffs, n = 16) or Ecigs (20-puff group, n = 16; or 60-puff group, n = 12). Thereafter, the cigarette and Ecig groups were randomly assigned for postexposure vessel myography testing on day 0 (D0, 1-4 h postexposure), day 1 (D1, 24-28 h postexposure), day 2 (D2, 48-52 h postexposure) and day 3 (72-76 h postexposure). The greatest effect on endothelium-dependent dilatation was observed within 24 h of exposure (∼50% decline between D0 and D1) for both cigarette and Ecig groups, and impairment persisted with all groups for up to 3 days. Changes in endothelium-independent dilatation responses were less severe (∼27%) and shorter lived (recovering by D2) compared with endothelium-dependent dilatation responses. Vasoconstriction in response to serotonin (5-HT) was similar to endothelium-independent dilatation, with greatest impairment (∼45% for all exposure groups) at D0-D1, returning to normal by D2. These data show that exposure to cigarettes and Ecigs triggers a similar level/duration of cerebrovascular dysfunction after a single exposure. The finding that Ecig (without nicotine) and cigarette (with nicotine) exposure produce the same effects suggesting that nicotine is not likely to be triggering MCA dysfunction, and that vaping (with/without nicotine) has potential to produce the same vascular harm and/or disease as smoking.
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Affiliation(s)
- Amber Mills
- Dept. of Physiology and Pharmacology, West Virginia University School of Medicine, Morgantown, WV 26506
| | - Duaa Dakhlallah
- Dept. of Microbiology, Immunology and Cell Biology, West Virginia University School of Medicine, Morgantown, WV 26506,Institute of Global Health and Human Ecology, School of Sciences & Engineering, The American University of Cairo, Egypt
| | - Madison Robinson
- Division of Exercise Physiology, West Virginia University School of Medicine, Morgantown, WV 26506
| | - Ally Kirk
- Alderson Broaddus University, West Virginia University School of Medicine, Morgantown, WV 26506
| | - Sam Llavina
- Center for Inhalation Toxicology, West Virginia University School of Medicine, Morgantown, WV 26506
| | - Jonathan W. Boyd
- Center for Inhalation Toxicology, West Virginia University School of Medicine, Morgantown, WV 26506,Dept. of Orthopedics, West Virginia University School of Medicine, Morgantown, WV 26506
| | - Paul D. Chantler
- Division of Exercise Physiology, West Virginia University School of Medicine, Morgantown, WV 26506,Dept. of Neuroscience, West Virginia University School of Medicine, Morgantown, WV 26506
| | - I. Mark Olfert
- Dept. of Physiology and Pharmacology, West Virginia University School of Medicine, Morgantown, WV 26506,Division of Exercise Physiology, West Virginia University School of Medicine, Morgantown, WV 26506,Center for Inhalation Toxicology, West Virginia University School of Medicine, Morgantown, WV 26506
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3
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Burrage EN, Aboaziza E, Hare L, Reppert S, Moore J, Goldsmith WT, Kelley EE, Mills A, Dakhlallah D, Chantler PD, Olfert IM. Long-term cerebrovascular dysfunction in the offspring from maternal electronic cigarette use during pregnancy. Am J Physiol Heart Circ Physiol 2021; 321:H339-H352. [PMID: 34170194 DOI: 10.1152/ajpheart.00206.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Electronic cigarettes (E-cigs) have been promoted as harm-free or less risky than smoking, even for women during pregnancy. These claims are made largely on E-cig aerosol having fewer number of toxic chemicals compared with cigarette smoke. Given that even low levels of smoking are found to produce adverse birth outcomes, we sought to test the hypothesis that vaping during pregnancy (with or without nicotine) would not be harm-free and would result in vascular dysfunction that would be evident in offspring during adolescent and/or adult life. Pregnant female Sprague Dawley rats were exposed to E-cig aerosol (1 h/day, 5 days/wk, starting on gestational day 2 until pups were weaned) using e-liquid with 0 mg/mL (E-cig0) or 18 mg/mL nicotine (E-cig18) and compared with ambient air-exposed controls. Body mass at birth and at weaning were not different between groups. Assessment of middle cerebral artery (MCA) reactivity revealed a 51%-56% reduction in endothelial-dependent dilation response to acetylcholine (ACh) for both E-cig0 and E-cig18 in 1-mo, 3-mo (adolescent), and 7-mo-old (adult) offspring (P < 0.05 compared with air, all time points). MCA responses to sodium nitroprusside (SNP) and myogenic tone were not different across groups, suggesting that endothelial-independent responses were not altered. The MCA vasoconstrictor response (5-hydroxytryptamine, 5-HT) was also not different across treatment and age groups. These data demonstrate that maternal vaping during pregnancy is not harm-free and confers significant cerebrovascular health risk/dysfunction to offspring that persists into adult life. NEW & NOTEWORTHY These data established that vaping electronic cigarettes during pregnancy, with or without nicotine, is not safe and confers significant risk potential to the cerebrovascular health of offspring in early and adult life. A key finding is that vaping without nicotine does not protect offspring from cerebrovascular dysfunction and results in the same level of cerebrovascular dysfunction (compared with maternal vaping with nicotine), indicating that the physical and/or chemical properties from the base solution (other than nicotine) are responsible for the cerebrovascular dysfunction that we observed. Listen to this article's corresponding podcast at https://ajpheart.podbean.com/e/maternal-vaping-impairs-vascular-function-in-theoffspring/.
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Affiliation(s)
- E N Burrage
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Department of Neuroscience, West Virginia University, Morgantown, West Virginia
| | - E Aboaziza
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,West Virginia Clinical and Translational Science Institute, West Virginia University, Morgantown, West Virginia
| | - L Hare
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia
| | - S Reppert
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia
| | - J Moore
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia
| | - W T Goldsmith
- Center for Inhalation Toxicology, West Virginia University, Morgantown, West Virginia.,Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
| | - E E Kelley
- Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
| | - A Mills
- Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
| | - D Dakhlallah
- Department of Microbiology, Immunology and Cell Biology, West Virginia University, Morgantown, West Virginia
| | - P D Chantler
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,Department of Neuroscience, West Virginia University, Morgantown, West Virginia.,West Virginia Clinical and Translational Science Institute, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia
| | - I M Olfert
- West Virginia University School of Medicine, West Virginia University, Morgantown, West Virginia.,West Virginia Clinical and Translational Science Institute, West Virginia University, Morgantown, West Virginia.,Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia.,Center for Inhalation Toxicology, West Virginia University, Morgantown, West Virginia.,Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
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4
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Ye Q, Mohamed R, Dakhlallah D, Gencheva M, Hu G, Pearce MC, Kolluri SK, Marsh CB, Eubank TD, Ivanov AV, Guo NL. Molecular Analysis of ZNF71 KRAB in Non-Small-Cell Lung Cancer. Int J Mol Sci 2021; 22:ijms22073752. [PMID: 33916522 PMCID: PMC8038441 DOI: 10.3390/ijms22073752] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/29/2021] [Accepted: 03/30/2021] [Indexed: 02/07/2023] Open
Abstract
Our previous study found that zinc finger protein 71 (ZNF71) mRNA expression was associated with chemosensitivity and its protein expression was prognostic of non-small-cell lung cancer (NSCLC). The Krüppel associated box (KRAB) transcriptional repression domain is commonly present in human zinc finger proteins, which are linked to imprinting, silencing of repetitive elements, proliferation, apoptosis, and cancer. This study revealed that ZNF71 KRAB had a significantly higher expression than the ZNF71 KRAB-less isoform in NSCLC tumors (n = 197) and cell lines (n = 117). Patients with higher ZNF71 KRAB expression had a significantly worse survival outcome than patients with lower ZNF71 KRAB expression (log-rank p = 0.04; hazard ratio (HR): 1.686 [1.026, 2.771]), whereas ZNF71 overall and KRAB-less expression levels were not prognostic in the same patient cohort. ZNF71 KRAB expression was associated with epithelial-to-mesenchymal transition (EMT) in both patient tumors and cell lines. ZNF71 KRAB was overexpressed in NSCLC cell lines resistant to docetaxel and paclitaxel treatment compared to chemo-sensitive cell lines, consistent with its association with poor prognosis in patients. Therefore, ZNF71 KRAB isoform is a more effective prognostic factor than ZNF71 overall and KRAB-less expression for NSCLC. Functional analysis using CRISPR-Cas9 and RNA interference (RNAi) screening data indicated that a knockdown/knockout of ZNF71 did not significantly affect NSCLC cell proliferation in vitro.
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Affiliation(s)
- Qing Ye
- WVU Cancer Institute, West Virginia University, Morgantown, WV 26506, USA; (Q.Y.); (R.M.); (D.D.); (G.H.); (T.D.E.); (A.V.I.)
- Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA
| | - Rehab Mohamed
- WVU Cancer Institute, West Virginia University, Morgantown, WV 26506, USA; (Q.Y.); (R.M.); (D.D.); (G.H.); (T.D.E.); (A.V.I.)
| | - Duaa Dakhlallah
- WVU Cancer Institute, West Virginia University, Morgantown, WV 26506, USA; (Q.Y.); (R.M.); (D.D.); (G.H.); (T.D.E.); (A.V.I.)
- Department of Microbiology, Immunology & Cell Biology, West Virginia University, Morgantown, WV 26506, USA;
- Institute of Global Health and Human Ecology, School of Sciences & Engineering, The American University of Cairo, New Cairo 11835, Egypt
| | - Marieta Gencheva
- Department of Microbiology, Immunology & Cell Biology, West Virginia University, Morgantown, WV 26506, USA;
| | - Gangqing Hu
- WVU Cancer Institute, West Virginia University, Morgantown, WV 26506, USA; (Q.Y.); (R.M.); (D.D.); (G.H.); (T.D.E.); (A.V.I.)
- Department of Microbiology, Immunology & Cell Biology, West Virginia University, Morgantown, WV 26506, USA;
| | - Martin C. Pearce
- Cancer Research Laboratory, Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; (M.C.P.); (S.K.K.)
| | - Siva Kumar Kolluri
- Cancer Research Laboratory, Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; (M.C.P.); (S.K.K.)
| | - Clay B. Marsh
- Department of Medicine, West Virginia University, Morgantown, WV 26506, USA;
| | - Timothy D. Eubank
- WVU Cancer Institute, West Virginia University, Morgantown, WV 26506, USA; (Q.Y.); (R.M.); (D.D.); (G.H.); (T.D.E.); (A.V.I.)
- Department of Microbiology, Immunology & Cell Biology, West Virginia University, Morgantown, WV 26506, USA;
| | - Alexey V. Ivanov
- WVU Cancer Institute, West Virginia University, Morgantown, WV 26506, USA; (Q.Y.); (R.M.); (D.D.); (G.H.); (T.D.E.); (A.V.I.)
- Department of Biochemistry, West Virginia University, Morgantown, WV 26506, USA
| | - Nancy Lan Guo
- WVU Cancer Institute, West Virginia University, Morgantown, WV 26506, USA; (Q.Y.); (R.M.); (D.D.); (G.H.); (T.D.E.); (A.V.I.)
- Department of Occupational and Environmental Health Sciences, West Virginia University, Morgantown, WV 26506, USA
- Correspondence: ; Tel.: +1-304-293-6455
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5
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Russell AE, Cavendish JZ, Rai A, Vannoy M, Dakhlallah AH, Hu H, Ren X, Amer A, Brown CM, Marsh CB, Simpkins JW, Dakhlallah D. Intermittent Lipopolysaccharide Exposure Significantly Increases Cortical Infarct Size and Impairs Autophagy. ASN Neuro 2021; 13:1759091421991769. [PMID: 33626880 PMCID: PMC8020222 DOI: 10.1177/1759091421991769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Globally, stroke is a leading cause of death and disability. Traditional risk factors like hypertension, diabetes, and obesity do not fully account for all stroke cases. Recent infection is regarded as changes in systemic immune signaling, which can increase thrombosis formation and other stroke risk factors. We have previously shown that administration of lipopolysaccharide (LPS) 30-minutes prior to stroke increases in infarct volume. In the current study, we found that animals intermittently exposed to LPS have larger cortical infarcts when compared to saline controls. To elucidate the mechanism behind this phenomenon, several avenues were investigated. We observed significant upregulation of tumor necrosis factor-alpha (TNF-α) mRNA, especially in the ipsilateral hemisphere of both saline and LPS exposed groups compared to sham surgery animals. We also observed significant reductions in expression of genes involved in autophagy in the ipsilateral hemisphere of LPS stroke animals. In addition, we assessed DNA methylation of autophagy genes and observed a significant increase in the ipsilateral hemisphere of LPS stroke animals. Intermittent exposure to LPS increases cortical infarct volume, downregulates autophagy genes, and induces hypermethylation of the corresponding CpG islands. These data suggest that intermittent immune activation may deregulate epigenetic mechanisms and promote neuropathological outcomes after stroke.
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Affiliation(s)
- Ashley E Russell
- Department of Neuroscience, West Virginia University School of Medicine, Morgantown, United States.,Rockerfeller Center for Neuroscience, West Virginia University School of Medicine, Morgantown, United States.,Department of Biology, School of Science, Penn State Erie, The Behrend College, Erie, Pennsylvania, United States
| | - John Z Cavendish
- Department of Neuroscience, West Virginia University School of Medicine, Morgantown, United States.,Rockerfeller Center for Neuroscience, West Virginia University School of Medicine, Morgantown, United States
| | - Ali Rai
- Department of Biomedical Engineering, West Virginia University School of Medicine, Morgantown, United States
| | - Mya Vannoy
- Department of Microbiology, Immunology and Cell Biology, West Virginia University School of Medicine, Morgantown, United States
| | - Ahmad H Dakhlallah
- Department of Biology, West Virginia University School of Medicine, Morgantown, United States
| | - Heng Hu
- Rockerfeller Center for Neuroscience, West Virginia University School of Medicine, Morgantown, United States.,Department of Physiology and Pharmacology, West Virginia University School of Medicine, Morgantown, United States
| | - Xuefang Ren
- Department of Neuroscience, West Virginia University School of Medicine, Morgantown, United States.,Rockerfeller Center for Neuroscience, West Virginia University School of Medicine, Morgantown, United States
| | - Amal Amer
- Department of Microbial Infection and Immunity, Infectious Diseases Institute, Ohio State University, Columbus, United States
| | - Candice M Brown
- Department of Neuroscience, West Virginia University School of Medicine, Morgantown, United States.,Rockerfeller Center for Neuroscience, West Virginia University School of Medicine, Morgantown, United States
| | - Clay B Marsh
- Robert C. Byrd Health Sciences Center, West Virginia University School of Medicine, Morgantown, United States
| | - James W Simpkins
- Department of Neuroscience, West Virginia University School of Medicine, Morgantown, United States.,Rockerfeller Center for Neuroscience, West Virginia University School of Medicine, Morgantown, United States
| | - Duaa Dakhlallah
- Department of Microbiology, Immunology and Cell Biology, West Virginia University School of Medicine, Morgantown, United States.,School of Sciences and Engineering, American University in Cairo, New Cairo, Egypt
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6
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Nwafor DC, Chakraborty S, Jun S, Brichacek AL, Dransfeld M, Gemoets DE, Dakhlallah D, Brown CM. Disruption of metabolic, sleep, and sensorimotor functional outcomes in a female transgenic mouse model of Alzheimer's disease. Behav Brain Res 2020; 398:112983. [PMID: 33137399 DOI: 10.1016/j.bbr.2020.112983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 10/05/2020] [Accepted: 10/26/2020] [Indexed: 12/17/2022]
Abstract
Alzheimer's Disease (AD) is the most prevalent form of dementia globally, and the number of individuals with AD diagnosis is expected to double by 2050. Numerous preclinical AD studies have shown that AD neuropathology accompanies alteration in learning and memory. However, less attention has been given to alterations in metabolism, sleep, and sensorimotor functional outcomes during AD pathogenesis. The objective of this study was to elucidate the extent to which metabolic activity, sleep-wake cycle, and sensorimotor function is impaired in APPSwDI/Nos2-/- (CVN-AD) transgenic mice. Female mice were used in this study because AD is more prevalent in women compared to men. We hypothesized that the presence of AD neuropathology in CVN-AD mice would accompany alterations in metabolic activity, sleep, and sensorimotor function. Our results showed that CVN-AD mice had significantly decreased energy expenditure compared to wild-type (WT) mice. An examination of associated functional outcome parameters showed that sleep activity was elevated during the awake (dark) cycle and as well as an overall decrease in spontaneous locomotor activity. An additional functional parameter, the nociceptive response to thermal stimuli, was also impaired in CVN-AD mice. Collectively, our results demonstrate CVN-AD mice exhibit alterations in functional parameters that resemble human-AD clinical progression.
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Affiliation(s)
- Divine C Nwafor
- Department of Neuroscience, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| | - Sreeparna Chakraborty
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| | - Sujung Jun
- Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| | - Allison L Brichacek
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| | - Margaret Dransfeld
- Department of Neuroscience, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| | - Darren E Gemoets
- Department of Biostatistics, School of Public Health, West Virginia University, Morgantown, WV 26506 USA
| | - Duaa Dakhlallah
- Department of Neuroscience, School of Medicine, West Virginia University, Morgantown, WV 26506, USA; Cancer Institute, West Virginia University Health Science Center, Morgantown, WV 26506, USA
| | - Candice M Brown
- Department of Neuroscience, School of Medicine, West Virginia University, Morgantown, WV 26506, USA; Department of Microbiology, Immunology, and Cell Biology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA; Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV 26506, USA.
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7
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Nwafor DC, Chakraborty S, Brichacek AL, Jun S, Gambill CA, Wang W, Engler-Chiurazzi EB, Dakhlallah D, Pinkerton AB, Millán JL, Benkovic SA, Brown CM. Loss of tissue-nonspecific alkaline phosphatase (TNAP) enzyme activity in cerebral microvessels is coupled to persistent neuroinflammation and behavioral deficits in late sepsis. Brain Behav Immun 2020; 84:115-131. [PMID: 31778743 PMCID: PMC7010562 DOI: 10.1016/j.bbi.2019.11.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Revised: 11/12/2019] [Accepted: 11/20/2019] [Indexed: 12/13/2022] Open
Abstract
Sepsis is a host response to systemic inflammation and infection that may lead to multi-organ dysfunction and eventual death. While acute brain dysfunction is common among all sepsis patients, chronic neurological impairment is prevalent among sepsis survivors. The brain microvasculature has emerged as a major determinant of sepsis-associated brain dysfunction, yet the mechanisms that underlie its associated neuroimmune perturbations and behavioral deficits are not well understood. An emerging body of data suggests that inhibition of tissue-nonspecific alkaline phosphatase (TNAP) enzyme activity in cerebral microvessels may be associated with changes in endothelial cell barrier integrity. The objective of this study was to elucidate the connection between alterations in cerebrovascular TNAP enzyme activity and brain microvascular dysfunction in late sepsis. We hypothesized that the disruption of TNAP enzymatic activity in cerebral microvessels would be coupled to the sustained loss of brain microvascular integrity, elevated neuroinflammatory responses, and behavioral deficits. Male mice were subjected to cecal ligation and puncture (CLP), a model of experimental sepsis, and assessed up to seven days post-sepsis. All mice were observed daily for sickness behavior and underwent behavioral testing. Our results showed a significant decrease in brain microvascular TNAP enzyme activity in the somatosensory cortex and spinal cord of septic mice but not in the CA1 and CA3 hippocampal regions. Furthermore, we showed that loss of cerebrovascular TNAP enzyme activity was coupled to a loss of claudin-5 and increased perivascular IgG infiltration in the somatosensory cortex. Analyses of whole brain myeloid and T-lymphoid cell populations also revealed a persistent elevation of infiltrating leukocytes, which included both neutrophil and monocyte myeloid derived suppressor cells (MDSCs). Regional analyses of the somatosensory cortex, hippocampus, and spinal cord revealed significant astrogliosis and microgliosis in the cortex and spinal cord of septic mice that was accompanied by significant microgliosis in the CA1 and CA3 hippocampal regions. Assessment of behavioral deficits revealed no changes in learning and memory or evoked locomotion. However, the hot plate test uncovered a novel anti-nociceptive phenotype in our septic mice, and we speculate that this phenotype may be a consequence of sustained GFAP astrogliosis and loss of TNAP activity in the somatosensory cortex and spinal cord of septic mice. Taken together, these results demonstrate that the loss of TNAP enzyme activity in cerebral microvessels during late sepsis is coupled to sustained neuroimmune dysfunction which may underlie, in part, the chronic neurological impairments observed in sepsis survivors.
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Affiliation(s)
- Divine C. Nwafor
- Department of Neuroscience, West Virginia University Health Science Center, Morgantown, WV 26506, USA
| | - Sreeparna Chakraborty
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, West Virginia University Health Science Center, Morgantown, WV 26506, USA
| | - Allison L. Brichacek
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, West Virginia University Health Science Center, Morgantown, WV 26506, USA
| | - Sujung Jun
- Wilmer Eye Institute, John Hopkins University School of Medicine, Baltimore, MD 21231, USA.
| | - Catheryne A. Gambill
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, West Virginia University Health Science Center, Morgantown, WV 26506, USA
| | - Wei Wang
- Department of Neuroscience, West Virginia University Health Science Center, Morgantown, WV 26506, USA.
| | | | - Duaa Dakhlallah
- Department of Neuroscience, West Virginia University Health Science Center, Morgantown, WV 26506, USA; Cancer Institute, West Virginia University Health Science Center, Morgantown, WV 26506, USA.
| | | | - José Luis Millán
- Sanford-Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA.
| | - Stanley A. Benkovic
- Department of Neuroscience, West Virginia University Health Science Center, Morgantown, WV 26506, USA
| | - Candice M. Brown
- Department of Neuroscience, West Virginia University Health Science Center, Morgantown, WV 26506, USA,Department of Microbiology, Immunology, and Cell Biology, School of Medicine, West Virginia University Health Science Center, Morgantown, WV 26506, USA,Corresponding Author: Candice M. Brown, Ph.D., Assistant Professor, Neuroscience, 108 Biomedical Road, Box 9303, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University Health Sciences, Morgantown, WV 26506, Phone: 304-293-0589,
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8
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Brichacek AL, Benkovic SA, Chakraborty S, Nwafor DC, Wang W, Jun S, Dakhlallah D, Geldenhuys WJ, Pinkerton AB, Millán JL, Brown CM. Systemic inhibition of tissue-nonspecific alkaline phosphatase alters the brain-immune axis in experimental sepsis. Sci Rep 2019; 9:18788. [PMID: 31827139 PMCID: PMC6906465 DOI: 10.1038/s41598-019-55154-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 11/19/2019] [Indexed: 12/27/2022] Open
Abstract
Tissue-nonspecific alkaline phosphatase (TNAP) is a ubiquitous enzyme present in many cells and tissues, including the central nervous system. Yet its functions at the brain-immune axis remain unclear. The goal of this study was to use a novel small molecular inhibitor of TNAP, SBI-425, to interrogate the function of TNAP in neuroimmune disorders. Following intraperitoneal (IP) administration of SBI-425, mass spectrometry analysis revealed that the SBI-425 does not cross the blood-brain barrier (BBB) in healthy mice. To elucidate the role of TNAP at the brain-immune axis, mice were subjected to experimental sepsis and received either vehicle or SBI-425 (25 mg/kg, IP) daily for 7 days. While SBI-425 administration did not affect clinical severity outcomes, we found that SBI-425 administration suppressed CD4 + Foxp3+ CD25- and CD8 + Foxp3+ CD25- splenocyte T-cell populations compared to controls. Further evaluation of SBI-425's effects in the brain revealed that TNAP activity was suppressed in the brain parenchyma of SBI-425-treated mice compared to controls. When primary brain endothelial cells were treated with a proinflammatory stimulus the addition of SBI-425 treatment potentiated the loss of barrier function in BBB endothelial cells. To further demonstrate a protective role for TNAP at endothelial barriers within this axis, transgenic mice with a conditional overexpression of TNAP were subjected to experimental sepsis and found to have increased survival and decreased clinical severity scores compared to controls. Taken together, these results demonstrate a novel role for TNAP activity in shaping the dynamic interactions within the brain-immune axis.
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Affiliation(s)
- Allison L Brichacek
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Stanley A Benkovic
- Department of Neuroscience, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Sreeparna Chakraborty
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Divine C Nwafor
- Department of Neuroscience, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Wei Wang
- Department of Neuroscience, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Sujung Jun
- Department of Physiology and Pharmacology, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Duaa Dakhlallah
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | - Werner J Geldenhuys
- Department of Pharmaceutical Sciences, School of Pharmacy, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA
| | | | - José Luis Millán
- Sanford-Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Candice M Brown
- Department of Microbiology, Immunology, and Cell Biology, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA.
- Department of Neuroscience, School of Medicine, Center for Basic and Translational Stroke Research, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, USA.
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9
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Caution K, Young N, Robledo-Avila F, Krause K, Abu Khweek A, Hamilton K, Badr A, Vaidya A, Daily K, Gosu H, Anne MNK, Eltobgy M, Dakhlallah D, Argwal S, Estfanous S, Zhang X, Partida-Sanchez S, Gavrilin MA, Jarjour WN, Amer AO. Caspase-11 Mediates Neutrophil Chemotaxis and Extracellular Trap Formation During Acute Gouty Arthritis Through Alteration of Cofilin Phosphorylation. Front Immunol 2019; 10:2519. [PMID: 31803174 PMCID: PMC6874099 DOI: 10.3389/fimmu.2019.02519] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 10/09/2019] [Indexed: 12/21/2022] Open
Abstract
Gout is characterized by attacks of arthritis with hyperuricemia and monosodium urate (MSU) crystal-induced inflammation within joints. Innate immune responses are the primary drivers for tissue destruction and inflammation in gout. MSU crystals engage the Nlrp3 inflammasome, leading to the activation of caspase-1 and production of IL-1β and IL-18 within gout-affected joints, promoting the influx of neutrophils and monocytes. Here, we show that caspase-11−/− mice and their derived macrophages produce significantly reduced levels of gout-specific cytokines including IL-1β, TNFα, IL-6, and KC, while others like IFNγ and IL-12p70 are not altered. IL-1β induces the expression of caspase-11 in an IL-1 receptor-dependent manner in macrophages contributing to the priming of macrophages during sterile inflammation. The absence of caspase-11 reduced the ability of macrophages and neutrophils to migrate in response to exogenously injected KC in vivo. Notably, in vitro, caspase-11−/− neutrophils displayed random migration in response to a KC gradient when compared to their WT counterparts. This phenotype was associated with altered cofilin phosphorylation. Unlike their wild-type counterparts, caspase-11−/− neutrophils also failed to produce neutrophil extracellular traps (NETs) when treated with MSU. Together, this is the first report demonstrating that caspase-11 promotes neutrophil directional trafficking and function in an acute model of gout. Caspase-11 also governs the production of inflammasome-dependent and -independent cytokines from macrophages. Our results offer new, previously unrecognized functions for caspase-11 in macrophages and neutrophils that may apply to other neutrophil-mediated disease conditions besides gout.
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Affiliation(s)
- Kyle Caution
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Nicholas Young
- Department of Rheumatology and Immunology, The Ohio State University Medical Center, Columbus, OH, United States
| | - Frank Robledo-Avila
- Center for Microbial Pathogenesis, Nationwide Children's Hospital, Columbus, OH, United States
| | - Kathrin Krause
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Arwa Abu Khweek
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States.,Department of Biology and Biochemistry, Birzeit University, West Bank, Palestine
| | - Kaitlin Hamilton
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Asmaa Badr
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Anup Vaidya
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Kylene Daily
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Hawin Gosu
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Midhun N K Anne
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Mostafa Eltobgy
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Duaa Dakhlallah
- Department of Microbiology, Immunology and Cell Biology, West Virginia University, Morgantown, WV, United States
| | - Sudha Argwal
- Department of Rheumatology and Immunology, The Ohio State University Medical Center, Columbus, OH, United States
| | - Shady Estfanous
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
| | - Xiaoli Zhang
- Center for Biostatistics, The Ohio State University Medical Center, Columbus, OH, United States
| | | | - Mikhail A Gavrilin
- Department of Internal Medicine, The Ohio State University Medical Center, Columbus, OH, United States
| | - Wael N Jarjour
- Department of Rheumatology and Immunology, The Ohio State University Medical Center, Columbus, OH, United States
| | - Amal O Amer
- Department of Microbial Infection and Immunity, The Ohio State University Medical Center, Columbus, OH, United States
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10
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Dakhlallah D, Wang Y, Bobo TA, Ellis E, Mo X, Piper MG, Eubank TD, Marsh CB. Constitutive AKT Activity Predisposes Lung Fibrosis by Regulating Macrophage, Myofibroblast and Fibrocyte Recruitment and Changes in Autophagy. ACTA ACUST UNITED AC 2019; 10:346-373. [PMID: 31750010 PMCID: PMC6866236 DOI: 10.4236/abb.2019.1010027] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The etiology and pathogenesis of pulmonary fibrosis is poorly understood. We and others reported that M-CSF/CSF-1, M-CSF-R and downstream AKT activation plays an important role in lung fibrosis in mice models and in IPF patients. To understand potential molecular pathways used by M-CSF-R activation to direct lung fibrosis, we used a novel transgenic mouse model that expresses a constitutively-active form of AKT, myristoylated AKT (Myr-Akt), driven by the c-fms (M-CSF-R) promoter. We were particularly interested in the basal immune state of the lungs of these Myr-Akt mice to assess M-CSF-R-related priming for lung fibrosis. In support of a priming effect, macrophages isolated from the lungs of unchallenged Myr-Akt mice displayed an M2-tropism, enhanced co-expression of M-CSF-R and α-SMA, reduced autophagy reflected by reduced expression of the key autophagy genes Beclin-1, MAP1-Lc3a(Lc3a), and MAP1-Lc3b(Lc3b), and increased p62/STSQM1 expression compared with littermate WT mice. Furthermore, Myr-Akt mice had more basal circulating fibrocytes than WT mice. Lastly, upon bleomycin challenge, Myr-Akt mice showed enhanced collagen deposition, increased F4/80+ and CD45+ cells, reduced autophagy genes Beclin-1, Lc3a, and Lc3b expression, and a shorter life-span than WT littermates. These data provide support that M-CSF-R/AKT activation may have a priming effect which can predispose lung tissue to pulmonary fibrosis.
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Affiliation(s)
- Duaa Dakhlallah
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA.,Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV, USA
| | - Yijie Wang
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA
| | - Tierra A Bobo
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA.,Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV, USA
| | - Emily Ellis
- Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV, USA
| | - Xiaokui Mo
- The Center for Biostatistics, The Ohio State University, Columbus, OH, USA
| | - Melissa G Piper
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA
| | - Timothy D Eubank
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA.,Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV, USA.,Department of Microbiology, Immunology and Cell Biology, West Virginia University, Morgantown, WV, USA
| | - Clay B Marsh
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA.,Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV, USA
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11
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Dakhlallah D, Brown C. P3-258: SEPSIS EXTRACELLULAR VESICLES AS EPIGENETIC MEDIATORS OF SYSTEMIC COMMUNICATION IN MURINE ALZHEIMER MODEL. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.3289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Krause K, Kopp BT, Tazi MF, Caution K, Hamilton K, Badr A, Shrestha C, Tumin D, Hayes D, Robledo-Avila F, Hall-Stoodley L, Klamer BG, Zhang X, Partida-Sanchez S, Parinandi NL, Kirkby SE, Dakhlallah D, McCoy KS, Cormet-Boyaka E, Amer AO. The expression of Mirc1/Mir17-92 cluster in sputum samples correlates with pulmonary exacerbations in cystic fibrosis patients. J Cyst Fibros 2017; 17:454-461. [PMID: 29241629 DOI: 10.1016/j.jcf.2017.11.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 10/27/2017] [Accepted: 11/16/2017] [Indexed: 12/19/2022]
Abstract
INTRODUCTION Cystic fibrosis (CF) is a multi-organ disorder characterized by chronic sino-pulmonary infections and inflammation. Many patients with CF suffer from repeated pulmonary exacerbations that are predictors of worsened long-term morbidity and mortality. There are no reliable markers that associate with the onset or progression of an exacerbation or pulmonary deterioration. Previously, we found that the Mirc1/Mir17-92a cluster which is comprised of 6 microRNAs (Mirs) is highly expressed in CF mice and negatively regulates autophagy which in turn improves CF transmembrane conductance regulator (CFTR) function. Therefore, here we sought to examine the expression of individual Mirs within the Mirc1/Mir17-92 cluster in human cells and biological fluids and determine their role as biomarkers of pulmonary exacerbations and response to treatment. METHODS Mirc1/Mir17-92 cluster expression was measured in human CF and non-CF plasma, blood-derived neutrophils, and sputum samples. Values were correlated with pulmonary function, exacerbations and use of CFTR modulators. RESULTS Mirc1/Mir17-92 cluster expression was not significantly elevated in CF neutrophils nor plasma when compared to the non-CF cohort. Cluster expression in CF sputum was significantly higher than its expression in plasma. Elevated CF sputum Mirc1/Mir17-92 cluster expression positively correlated with pulmonary exacerbations and negatively correlated with lung function. Patients with CF undergoing treatment with the CFTR modulator Ivacaftor/Lumacaftor did not demonstrate significant change in the expression Mirc1/Mir17-92 cluster after six months of treatment. CONCLUSIONS Mirc1/Mir17-92 cluster expression is a promising biomarker of respiratory status in patients with CF including pulmonary exacerbation.
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Affiliation(s)
- Kathrin Krause
- Department of Microbial Infection and Immunity, Columbus, OH, USA; Dorothy M. Davis Heart and Lung Research Institute, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Benjamin T Kopp
- Department of Pediatrics, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Mia F Tazi
- Department of Microbial Infection and Immunity, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Kyle Caution
- Department of Microbial Infection and Immunity, Columbus, OH, USA; Dorothy M. Davis Heart and Lung Research Institute, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Kaitlin Hamilton
- Department of Microbial Infection and Immunity, Columbus, OH, USA; Dorothy M. Davis Heart and Lung Research Institute, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Asmaa Badr
- Department of Microbial Infection and Immunity, Columbus, OH, USA; Dorothy M. Davis Heart and Lung Research Institute, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Chandra Shrestha
- Department of Pediatrics, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Dmitry Tumin
- Department of Anesthesiology & Pain Medicine, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Don Hayes
- Department of Pediatrics, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Frank Robledo-Avila
- Department of Pediatrics, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Luanne Hall-Stoodley
- Department of Microbial Infection and Immunity, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Brett G Klamer
- Center for Biostatistics, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Xiaoli Zhang
- Center for Biostatistics, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Santiago Partida-Sanchez
- Department of Pediatrics, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Narasimham L Parinandi
- Dorothy M. Davis Heart and Lung Research Institute, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Stephen E Kirkby
- Department of Pediatrics, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Duaa Dakhlallah
- Microbiology, Immunology and Cell Biology Department, West Virginia University, Morgantown, WV, USA
| | - Karen S McCoy
- Department of Pediatrics, Columbus, OH, USA; Nationwide Children's Hospital, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA
| | - Estelle Cormet-Boyaka
- Department of Veterinary Biosciences, Columbus, OH, USA; Dorothy M. Davis Heart and Lung Research Institute, Columbus, OH, USA
| | - Amal O Amer
- Department of Microbial Infection and Immunity, Columbus, OH, USA; Dorothy M. Davis Heart and Lung Research Institute, Columbus, OH, USA; The Ohio State University College of Medicine, Columbus, OH, USA.
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13
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Robbins ME, Dakhlallah D, Marsh CB, Rogers LK, Tipple TE. Of mice and men: correlations between microRNA-17∼92 cluster expression and promoter methylation in severe bronchopulmonary dysplasia. Am J Physiol Lung Cell Mol Physiol 2016; 311:L981-L984. [PMID: 27694474 DOI: 10.1152/ajplung.00390.2016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 09/28/2016] [Indexed: 11/22/2022] Open
Abstract
We previously demonstrated that decreased miR-17∼92 cluster expression was 1) present in lungs from human infants who died with bronchopulmonary dysplasia (BPD); 2) inversely correlated with DNA methyltransferase (DNMT) expression and promoter methylation; and 3) correlated with a subsequent diagnosis of BPD at 36 wk gestational age. We tested the hypothesis that plasma miR-17 levels would be lowest in infants who ultimately develop severe BPD. Secondly, we utilized our well-characterized murine model of severe BPD that combines perinatal inflammation with postnatal hyperoxia to test the hypothesis that alterations in lung miR-17∼92, DNMT, and promoter methylation in our model would mirror our findings in tissues from premature human infants. Plasma was obtained during the first 5 days of life from premature infants born ≤32 wk gestation. Lung tissues were harvested from mice exposed to maternal inflammation and neonatal hyperoxia for 14 days after birth. miR-17∼92 cluster expression and DNA methyltransferase expression were measured by qRT-PCR, and promoter methylation was assessed by Methyl-Profiler assay. Plasma miR-17 levels are significantly lower in the first week of life in human infants who develop severe BPD compared with mild or moderate BPD. Data from our severe BPD murine model reveal that lung miR-17∼92 cluster expression is significantly attenuated, and levels inversely correlated with DNMT expression and miR-17∼92 cluster promoter methylation. Collectively, our data support a plausible role for epigenetically altered miR-17∼92 cluster in the pathogenesis of severe BPD.
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Affiliation(s)
- Mary E Robbins
- Division of Neonatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Duaa Dakhlallah
- Departments of Microbiology, Immunology, and Cell Biology, West Virginia University, Morgantown, West Virginia
| | - Clay B Marsh
- Departments of Microbiology, Immunology, and Cell Biology, West Virginia University, Morgantown, West Virginia
| | - Lynette K Rogers
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio; and
| | - Trent E Tipple
- Division of Neonatology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
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14
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Khalil H, Tazi M, Caution K, Ahmed A, Kanneganti A, Assani K, Kopp B, Marsh C, Dakhlallah D, Amer AO. Aging is associated with hypermethylation of autophagy genes in macrophages. Epigenetics 2016; 11:381-8. [PMID: 26909551 DOI: 10.1080/15592294.2016.1144007] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Autophagy is a biological process characterized by self-digestion and involves induction of autophagosome formation, leading to degradation of autophagic cargo. Aging is associated with the reduction of autophagy activity leading to neurodegenerative disorders, chronic inflammation, and susceptibility to infection; however, the underlying mechanism is unclear. DNA methylation by DNA methyltransferases reduces the expression of corresponding genes. Since macrophages are major players in inflammation and defense against infection we determined the differences in methylation of autophagy genes in macrophages derived from young and aged mice. We found that promoter regions of Atg5 and LC3B are hypermethylated in macrophages from aged mice and this is accompanied by low gene expression. Treatment of aged mice and their derived macrophages with methyltransferase inhibitor (2)-epigallocatechin-3-gallate (EGCG) or specific DNA methyltransferase 2 (DNMT2) siRNA restored the expression of Atg5 and LC3 in vivo and in vitro. Our study builds a foundation for the development of novel therapeutics aimed to improve autophagy in the elderly population and suggests a role for DNMT2 in DNA methylation activities.
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Affiliation(s)
- Hany Khalil
- a Department of Molecular Biology , Genetic Engineering and Biotechnology Research Institute, University of Sadat City , Sadat City , Egypt
| | - Mia Tazi
- b Department of Microbial Infection and Immunity , Center for Microbial Interface Biology, The Ohio State University , Columbus , OH.,c The Davis Heart and Lung Research Institute, The Ohio State University , Columbus , OH
| | - Kyle Caution
- b Department of Microbial Infection and Immunity , Center for Microbial Interface Biology, The Ohio State University , Columbus , OH.,c The Davis Heart and Lung Research Institute, The Ohio State University , Columbus , OH
| | - Amr Ahmed
- b Department of Microbial Infection and Immunity , Center for Microbial Interface Biology, The Ohio State University , Columbus , OH.,c The Davis Heart and Lung Research Institute, The Ohio State University , Columbus , OH
| | - Apurva Kanneganti
- b Department of Microbial Infection and Immunity , Center for Microbial Interface Biology, The Ohio State University , Columbus , OH.,c The Davis Heart and Lung Research Institute, The Ohio State University , Columbus , OH
| | - Kaivon Assani
- d The Research Institute at Nationwide Children's Hospital, The Ohio State University , Columbus , OH
| | - Benjamin Kopp
- d The Research Institute at Nationwide Children's Hospital, The Ohio State University , Columbus , OH
| | - Clay Marsh
- c The Davis Heart and Lung Research Institute, The Ohio State University , Columbus , OH
| | - Duaa Dakhlallah
- c The Davis Heart and Lung Research Institute, The Ohio State University , Columbus , OH
| | - Amal O Amer
- b Department of Microbial Infection and Immunity , Center for Microbial Interface Biology, The Ohio State University , Columbus , OH.,c The Davis Heart and Lung Research Institute, The Ohio State University , Columbus , OH
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15
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Tazi M, Dakhlallah D, Khalil H, Caution K, Marsh C. An intricate link between autophagy and microRNAs in cystic fibrosis (HUM1P.262). The Journal of Immunology 2015. [DOI: 10.4049/jimmunol.194.supp.52.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Each year 1,000 children and adults are diagnosed with Cystic Fibrosis (CF), a fatal genetic disorder that critically affects the lungs. Autophagy, a highly-regulated biological process, normally functions to clear dysfunctional CFTR (CF transmembrane conductance regulator) proteins that aggregate within macrophages. However, this process is defective in CF patients and CF mice, as their macrophages express limited autophagy activity thus exacerbating inflammation. Present therapies to improve autophagy are ineffective. MicroRNAs (miRNAs, miRs) are non-coding RNAs that post-transcriptionally regulate targeted mRNA expression. The objective for this study is to elucidate the role of miRNAs in CF macrophages in an effort to restore autophagy. We hypothesize CF macrophages exhibit elevated cluster expression that downregulate autophagy targets thus contributing to autophagy dysfunction. We find that, CF macrophages exhibit decreased autophagy protein expression and elevated cluster expression compared to WT. When cluster expression is absent, autophagy protein expression is restored, suggesting the canonical inverse relationship between miRNA and protein expression. Predicted autophagy targets of specific miRs comprising the cluster were validated. In vivo downregulation of specific miRs comprising the cluster increases autophagy expression. Thus, this data demonstrates, microRNA cluster expression correlates to autophagy expression which modulates the pathophysiology of CF.
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Affiliation(s)
- Mia Tazi
- 1Microbial Infection and Immunity, The Ohio State University, Columbus, OH
- 2Center for Microbial Interface Biology, The Ohio State University, Columbus, OH
| | - Duaa Dakhlallah
- 3Internal Medicine, The Ohio State University, Columbus, OH
- 4Pulmonary, Allergy, Critical Care and Sleep Medicine, The Ohio State University, Columbus, OH
- 5The Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH
| | - Hany Khalil
- 1Microbial Infection and Immunity, The Ohio State University, Columbus, OH
- 2Center for Microbial Interface Biology, The Ohio State University, Columbus, OH
| | - Kyle Caution
- 1Microbial Infection and Immunity, The Ohio State University, Columbus, OH
- 2Center for Microbial Interface Biology, The Ohio State University, Columbus, OH
| | - Clay Marsh
- 3Internal Medicine, The Ohio State University, Columbus, OH
- 4Pulmonary, Allergy, Critical Care and Sleep Medicine, The Ohio State University, Columbus, OH
- 5The Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH
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16
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Tazi M, Dakhlallah D, Caution K, Marsh C, Amer A. An Intricate Link between MicroRNAs and Regulation of Autophagy in Cystic Fibrosis. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.571.27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mia Tazi
- Microbial Infection and ImmunityThe Ohio State UniversityColumbusOhioUnited States
| | - Duaa Dakhlallah
- Internal MedicineThe Ohio State UniversityColumbusOhioUnited States
| | - Kyle Caution
- Microbial Infection and ImmunityThe Ohio State UniversityColumbusOhioUnited States
| | - Clay Marsh
- Internal MedicineThe Ohio State UniversityColumbusOhioUnited States
| | - Amal Amer
- Microbial Infection and ImmunityThe Ohio State UniversityColumbusOhioUnited States
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17
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Dakhlallah D, Patterson I, Gross AC, Evans R, Eubank TD. Abstract PR03: Macrophage phenotype drives tumor program via epigenetic machinery carried in secreted microvesicles. Cancer Res 2015. [DOI: 10.1158/1538-7445.chtme14-pr03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Macrophage phenotypes are reported to regulate tumor progression, angiogenesis, and metastasis in breast cancer by producing soluble factors modulating these programs. Macrophages also communicate via secreted microvesicles (MVs) which are taken-up by neighboring epithelium. MVs contain mRNAs coding the epigenetic regulating machinery, DNA methyltranferases (DNMTs) and histone deacetylases (HDACs), which augment or silence expression via promoter CpG island methylation. Tie2-expressing monocytes (TEMs) is a subset of monocytes reported to augment tumor angiogenesis and metastasis. Recently, we found that increased levels of colony stimulating factor-1 (CSF1) can expand the TEM population in circulation, enabling an influx into breast tumors. Interestingly, we also found that expansion of TEMs by hypoxia was regulated by HIF-1α; and not HIF-2α, but only once they enter the tumor proper. We hypothesized that MVs secreted from M1 and M2 macrophages or TEMs contain epigenetic regulatory machinery which regulate CpG island methylation and gene expression of tumor suppressor genes (TSGs) and genes driving epithelial-to-mesenchymal transition (EMT).
We differentiated M1, M2, and TEMs in vitro from CD14+ monocytes isolated from peripheral blood. These cell populations were confirmed using flow cytometry for CD68 and CD80 for M1, CD163 for M2, and CD14/Tie2 for TEMs, as well as M1 (IL-6 and TNFα) and M2 (IL-10 and mannose receptor-1) gene expression profiles. After, we collected MVs using high speed centrifugation techniques characterized by flow cytometry and isolated their nucleic acid content. Using qRT-PCR, we found differential presence of mRNAs for DNMTs and HDACs between M1, M2, and TEM MVs. We cultured these MVs with MCF-10A normal mammary epithelial cells or BEAS-2B normal lung epithelial cells (target cells) for 24 hours and demonstrated MV uptake using Syto RNASelect (RNA) and DiIC16(3) (lipid membrane) and confocal microscopy. After, we isolated RNA and DNA from the target cells and analyzed DNMTs, HDACs, and EMT mRNA expression as well as methyl-specific PCR for CpG island methylation in the promoters of EMT genes. We found that MVs from M1 macrophages increased DNMTs mRNA expression compared to MVs produced from M2 and quiescent macrophages (M0) as well as untreated target cells. To the contrary, HDACs mRNA expression in these target cells cultured with M1-derived MVs was abrogated compared to target cells cultured with MVs from M2 and M0 macrophages and untreated target cells. As a result of the differential MV-carrying DNMTs and HDACs mRNA transferred to the target cells, we found significant differences in CpG island promoter methylation and resultant gene expression in a signature of EMT genes, including TWIST, WNT5A, VIM, FOXC2, KRT19, STAT3, SNAI1 BMP1, TGFb, DSP, AKT1, NUDT13, and ZEB1. The regulation of EMT and tumor suppressor gene promoter methylation and gene expression in MDA-MB-231 human breast cancer cells, as well as the disparate regulation of methylation and gene expression patterns on these target cells as well endothelial cells (HUVEC) by MVs collected from CD14+/Tie2+ TEMs is ongoing.
Our current and ongoing work, we establish that M1 and M2 macrophages, and TEMs, secrete MVs containing distinct epigenetic profiles which are taken-up by target cells to regulate promoter methylation and gene expression of TSGs and genes driving EMT. This program of macrophage function may be important in the progression of solid tumors via inhibition of TSGs and activation of a signature of EMT genes in normal epithelial cells as well as to direct the endothelium to support tumor progression.
This abstract is also presented as Poster A31.
Citation Format: Duaa Dakhlallah, Ivory Patterson, Amy C. Gross, Randall Evans, Tim D. Eubank. Macrophage phenotype drives tumor program via epigenetic machinery carried in secreted microvesicles. [abstract]. In: Abstracts: AACR Special Conference on Cellular Heterogeneity in the Tumor Microenvironment; 2014 Feb 26-Mar 1; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2015;75(1 Suppl):Abstract nr PR03. doi:10.1158/1538-7445.CHTME14-PR03
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Kabbout M, Dakhlallah D, Sharma S, Bronisz A, Srinivasan R, Piper M, Marsh CB, Ostrowski MC. MicroRNA 17-92 cluster mediates ETS1 and ETS2-dependent RAS-oncogenic transformation. PLoS One 2014; 9:e100693. [PMID: 24968297 PMCID: PMC4072627 DOI: 10.1371/journal.pone.0100693] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 05/27/2014] [Indexed: 01/01/2023] Open
Abstract
The ETS-family transcription factors Ets1 and Ets2 are evolutionarily conserved effectors of the RAS/ERK signaling pathway, but their function in Ras cellular transformation and biology remains unclear. Taking advantage of Ets1 and Ets2 mouse models to generate Ets1/Ets2 double knockout mouse embryonic fibroblasts, we demonstrate that deletion of both Ets1 and Ets2 was necessary to inhibit HrasG12V induced transformation both in vitro and in vivo. HrasG12V expression in mouse embryonic fibroblasts increased ETS1 and ETS2 expression and binding to cis-regulatory elements on the c-Myc proximal promoter, and consequently induced a robust increase in MYC expression. The expression of the oncogenic microRNA 17-92 cluster was increased in HrasG12V transformed cells, but was significantly reduced when ETS1 and ETS2 were absent. MYC and ETS1 or ETS2 collaborated to increase expression of the oncogenic microRNA 17-92 cluster in HrasG12V transformed cells. Enforced expression of exogenous MYC or microRNA 17-92 rescued HrasG12V transformation in Ets1/Ets2-null cells, revealing a direct function for MYC and microRNA 17-92 in ETS1/ETS2-dependent HrasG12V transformation.
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Affiliation(s)
- Mohamed Kabbout
- Department of Molecular and Cellular Biochemistry, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Graduate Program in Molecular Cellular and Developmental Biology, The Ohio State University, Columbus, Ohio, United States of America
- Solid Tumor Program, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Duaa Dakhlallah
- Graduate Program in Molecular Cellular and Developmental Biology, The Ohio State University, Columbus, Ohio, United States of America
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio, United States of America
| | - Sudarshana Sharma
- Department of Molecular and Cellular Biochemistry, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Solid Tumor Program, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Agnieszka Bronisz
- Department of Molecular and Cellular Biochemistry, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Solid Tumor Program, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Ruchika Srinivasan
- Department of Molecular and Cellular Biochemistry, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Graduate Program in Molecular Cellular and Developmental Biology, The Ohio State University, Columbus, Ohio, United States of America
- Solid Tumor Program, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Melissa Piper
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio, United States of America
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Clay B. Marsh
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio, United States of America
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Michael C. Ostrowski
- Department of Molecular and Cellular Biochemistry, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Solid Tumor Program, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
- * E-mail:
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Forget MA, Voorhees JL, Cole SL, Dakhlallah D, Patterson IL, Gross AC, Moldovan L, Mo X, Evans R, Marsh CB, Eubank TD. Macrophage colony-stimulating factor augments Tie2-expressing monocyte differentiation, angiogenic function, and recruitment in a mouse model of breast cancer. PLoS One 2014; 9:e98623. [PMID: 24892425 PMCID: PMC4043882 DOI: 10.1371/journal.pone.0098623] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 05/06/2014] [Indexed: 02/07/2023] Open
Abstract
Reports demonstrate the role of M-CSF (CSF1) in tumor progression in mouse models as well as the prognostic value of macrophage numbers in breast cancer patients. Recently, a subset of CD14+ monocytes expressing the Tie2 receptor, once thought to be predominantly expressed on endothelial cells, has been characterized. We hypothesized that increased levels of CSF1 in breast tumors can regulate differentiation of Tie2- monocytes to a Tie2+ phenotype. We treated CD14+ human monocytes with CSF1 and found a significant increase in CD14+/Tie2+ positivity. To understand if CSF1-induced Tie2 expression on these cells improved their migratory ability, we pre-treated CD14+ monocytes with CSF1 and used Boyden chemotaxis chambers to observe enhanced response to angiopoietin-2 (ANG2), the chemotactic ligand for the Tie2 receptor. We found that CSF1 pre-treatment significantly augmented chemotaxis and that Tie2 receptor upregulation was responsible as siRNA targeting Tie2 receptor abrogated this effect. To understand any augmented angiogenic effect produced by treating these cells with CSF1, we cultured human umbilical vein endothelial cells (HUVECs) with conditioned supernatants from CSF1-pre-treated CD14+ monocytes for a tube formation assay. While supernatants from CSF1-pre-treated TEMs increased HUVEC branching, a neutralizing antibody against the CSF1R abrogated this activity, as did siRNA against the Tie2 receptor. To test our hypothesis in vivo, we treated PyMT tumor-bearing mice with CSF1 and observed an expansion in the TEM population relative to total F4/80+ cells, which resulted in increased angiogenesis. Investigation into the mechanism of Tie2 receptor upregulation on CD14+ monocytes by CSF1 revealed a synergistic contribution from the PI3 kinase and HIF pathways as the PI3 kinase inhibitor LY294002, as well as HIF-1α-deficient macrophages differentiated from the bone marrow of HIF-1αfl/fl/LysMcre mice, diminished CSF1-stimulated Tie2 receptor expression.
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Affiliation(s)
- Mary A. Forget
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Molecular Cellular and Developmental Biology Program, The Ohio State University, Columbus, Ohio, United States of America
| | - Jeffrey L. Voorhees
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Sara L. Cole
- Campus Microscopy and Imaging Facility, The Ohio State University, Columbus, Ohio, United States of America
| | - Duaa Dakhlallah
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Ivory L. Patterson
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Amy C. Gross
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Leni Moldovan
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Xiaokui Mo
- The Center for Biostatistics, The Ohio State University, Columbus, Ohio, United States of America
| | - Randall Evans
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Clay B. Marsh
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Molecular Cellular and Developmental Biology Program, The Ohio State University, Columbus, Ohio, United States of America
- The Ohio State University Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Tim D. Eubank
- Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio, United States of America
- The Ohio State University Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
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Dakhlallah D, Batte K, Wang Y, Cantemir-Stone CZ, Yan P, Nuovo G, Mikhail A, Hitchcock CL, Wright VP, Nana-Sinkam SP, Piper MG, Marsh CB. Epigenetic regulation of miR-17~92 contributes to the pathogenesis of pulmonary fibrosis. Am J Respir Crit Care Med 2013; 187:397-405. [PMID: 23306545 DOI: 10.1164/rccm.201205-0888oc] [Citation(s) in RCA: 200] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
RATIONALE Idiopathic pulmonary fibrosis (IPF) is a disease of progressive lung fibrosis with a high mortality rate. In organ repair and remodeling, epigenetic events are important. MicroRNAs (miRNAs) regulate gene expression post-transcriptionally and can target epigenetic molecules important in DNA methylation. The miR-17~92 miRNA cluster is critical for lung development and lung epithelial cell homeostasis and is predicted to target fibrotic genes and DNA methyltransferase (DNMT)-1 expression. OBJECTIVES We investigated the miR-17~92 cluster expression and its role in regulating DNA methylation events in IPF lung tissue. METHODS Expression and DNA methylation patterns of miR-17~92 were determined in human IPF lung tissue and fibroblasts and fibrotic mouse lung tissue. The relationship between the miR-17~92 cluster and DNMT-1 expression was examined in vitro. Using a murine model of pulmonary fibrosis, we examined the therapeutic potential of the demethylating agent, 5'-aza-2'-deoxycytidine. MEASUREMENTS AND MAIN RESULTS Compared with control samples, miR-17~92 expression was reduced in lung biopsies and lung fibroblasts from patients with IPF, whereas DNMT-1 expression and methylation of the miR-17~92 promoter was increased. Several miRNAs from the miR-17~92 cluster targeted DNMT-1 expression resulting in a negative feedback loop. Similarly, miR-17~92 expression was reduced in the lungs of bleomycin-treated mice. Treatment with 5'-aza-2'-deoxycytidine in a murine bleomycin-induced pulmonary fibrosis model reduced fibrotic gene and DNMT-1 expression, enhanced miR-17~92 cluster expression, and attenuated pulmonary fibrosis. CONCLUSIONS This study provides insight into the pathobiology of IPF and identifies a novel epigenetic feedback loop between miR-17~92 and DNMT-1 in lung fibrosis.
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Affiliation(s)
- Duaa Dakhlallah
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, College of Medicine, Davis Heart and Lung Research Institute, Columbus, OH, USA
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Park JC, Zhang X, Ferrera J, Dakhlallah D, Popalzai M, Hirsch J, Hood DC. Comparison of contrast-response functions from multifocal visual evoked potentials (mfVEPs) and functional MRI signals. J Vis 2010. [DOI: 10.1167/6.6.425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Jeyaraj SC, Dakhlallah D, Hill SR, Lee BS. Expression and distribution of HuR during ATP depletion and recovery in proximal tubule cells. Am J Physiol Renal Physiol 2006; 291:F1255-63. [PMID: 16788138 PMCID: PMC1941714 DOI: 10.1152/ajprenal.00440.2005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Human antigen R (HuR) is a nucleocytoplasmic shuttling protein that binds to and stabilizes mRNAs containing adenine- and uridine-rich elements. Under normal growth conditions, the bulk of HuR is maintained in the nucleus, but under conditions of cell stress, HuR may become more prevalent in the cytosol, where it can stabilize mRNA and regulate gene expression. We have studied the behavior of HuR in LLC-PK1 proximal tubule cells subjected to ATP depletion and recovery. ATP depletion resulted in detectable net movement of HuR out of the nucleus, followed by net movement of HuR back into the nucleus on reversion to normal growth medium. In addition, HuR protein levels increased during energy depletion. This increase was inhibited by cycloheximide and was independent of HuR mRNA levels, since no change was noted in the quantity of HuR transcript. In contrast, recovery in normal growth medium resulted in increased HuR mRNA, while protein levels decreased to baseline. This suggested a mechanism by which previously injured cells maintained normal levels of HuR but were primed to rapidly translate increased amounts of protein on subsequent insults. Indeed, a second round of ATP depletion resulted in heightened HuR protein translation at a rate more rapid than during the first insult. Additionally, the second insult produced increased HuR levels in the cytoplasm while still maintaining high amounts in the nucleus, indicating that nuclear export may not be required on subsequent insults. These results suggest a role for HuR in protecting kidney epithelia from injury during ischemic stress.
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Affiliation(s)
- Selvi C Jeyaraj
- Department of Physiology and Cell Biology, The Ohio State University, 1645 Neil Ave., Columbus, OH 43210, USA
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Abstract
V-ATPases are multisubunit membrane proteins that use ATP binding and hydrolysis to transport protons across membranes against a concentration gradient. Although some cell types express plasma membrane forms of these transporters, all eukaryotes require V-ATPases to maintain an acidic pH in membrane-bound compartments of endocytic and secretory networks to facilitate protein trafficking and processing. Mammalian cells that completely lack V-ATPases are not viable; yet, the abundance of V-ATPases can differ among cell types by an order of magnitude or more, requiring precise control of their expression. We previously showed that mRNA stability appears to play a major role in regulating overall abundance of V-ATPases. In this report, we demonstrate that the stability of V-ATPase mRNA is regulated through AU-rich elements in 3'-untranslated regions. Unlike some mRNAs that are short-lived due to the presence of these elements, V-ATPase mRNAs have half-lives of hours to days. However, during stress induced by ATP depletion, AU-rich elements are necessary to maintain stability of these transcripts and their presence in the cytoplasm. HuR, an RNA-binding protein that interacts with and stabilizes AU-rich mRNAs, shows increased binding to some V-ATPase mRNAs during ATP depletion. siRNA-mediated knockdown of HuR results in diminished V-ATPase expression. These results indicate that AU-rich elements and associated proteins can play a role in regulation of even very stable mRNAs by protecting against loss during cellular stress.
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Affiliation(s)
- Selvi Jeyaraj
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, 43210, USA
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