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Sidsworth DA, Sellers SL, Reutens-Hernandez JP, Dunn EA, Gray SL, Payne GW. Impact of sex on microvascular reactivity in a murine model of diet-induced obesity and insulin resistance. Heliyon 2021; 7:e06217. [PMID: 33644477 PMCID: PMC7895723 DOI: 10.1016/j.heliyon.2021.e06217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 10/26/2020] [Accepted: 02/04/2021] [Indexed: 11/24/2022] Open
Abstract
The association of obesity with cardiovascular disease is well established. However, the interplay of obesity and vascular dysfunction in peripheral tissues such as skeletal muscle, which plays a key in role metabolic homeostasis, requires further study. In particular, there is a paucity of data with regard to sex-differences. Therefore, using a murine model (C57BL/6) of high-fat diet-induced obesity and insulin resistance, we investigated changes in vascular function in gluteus maximus muscle of female and male mice. Diet-induced obesity resulted in alterations in microvascular function. Obese male mice displayed impaired vasoconstriction in second order arterioles compared to lean, male mice, whereas arterioles of obese, female mice displayed significant impairments of both vasodilation and vasoconstrictor responses compared to lean, female mice. Overall, this study identifies distinct differences in how obesity impacts the female and male murine response to skeletal muscle vascular function. This work advances our understanding of sex-specific risk of metabolic complications of obesity and indicates the need for expansion of this study as well as detailed investigation of sex-specific differences in obesity pathology in the future.
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Affiliation(s)
- Danielle A Sidsworth
- Northern Medical Program, University of Northern British Columbia, Prince George, BC, V2N 4Z9, Canada
| | - Stephanie L Sellers
- Centre for Heart Lung Innovation & Department of Radiology, University of British Columba & St. Paul's Hospital, Vancouver, BC, V6Z 1Y6, Canada
| | | | - Elizabeth A Dunn
- Northern Medical Program, University of Northern British Columbia, Prince George, BC, V2N 4Z9, Canada
| | - Sarah L Gray
- Northern Medical Program, University of Northern British Columbia, Prince George, BC, V2N 4Z9, Canada
| | - Geoffrey W Payne
- Northern Medical Program, University of Northern British Columbia, Prince George, BC, V2N 4Z9, Canada
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Javed S, Mitchell K, Sidsworth D, Sellers SL, Reutens-Hernandez J, Massicotte HB, Egger KN, Lee CH, Payne GW. Inonotus obliquus attenuates histamine-induced microvascular inflammation. PLoS One 2019; 14:e0220776. [PMID: 31437163 PMCID: PMC6706056 DOI: 10.1371/journal.pone.0220776] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Accepted: 07/23/2019] [Indexed: 01/14/2023] Open
Abstract
Cell-to-cell communication is a key element of microvascular blood flow control, including rapidly carrying signals through the vascular endothelium in response to local stimuli. This cell-to-cell communication is negatively impacted during inflammation through the disruption of junctional integrity. Such disruption is associated with promoting the onset of cardiovascular diseases as a result of altered microvascular blood flow regulation. Therefore, understanding the mechanisms how inflammation drives microvascular dysfunction and compounds that mitigate such inflammation and dysfunction are of great interest for development. As such we aimed to investigate extracts of mushrooms as potential novel compounds. Using intravital microscopy, the medicinal mushroom, Inonotus obliquus was observed, to attenuate histamine-induced inflammation conducted vasodilation in second-order arterioles in the gluteus maximus muscle of C57BL/6 mice. Mast cell activation by C48/80 similarly disrupted endothelial junctions and conducted vasodilation but only histamine was blocked by the histamine antagonist, pyrilamine not C48/80 suggesting the importance of mast cell activation. Data presented here supports that histamine induced inflammation is a major disruptor of junctional integrity, and highlights the important anti-inflammatory properties of Inonotus obliquus focusing future assessment of mast cells as putative target for Inonotus obliquus.
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Affiliation(s)
- Sumreen Javed
- Biochemistry and Molecular Biology Program, University of Northern British Columbia, Prince George, Canada
| | - Kevin Mitchell
- Northern Medical Program, University of Northern British Columbia, Prince George, Canada
| | - Danielle Sidsworth
- Northern Medical Program, University of Northern British Columbia, Prince George, Canada
| | - Stephanie L. Sellers
- Centre for Heart Lung Innovation & Department of Radiology, University of British Columba & St. Paul’s Hospital, Vancouver, Canada
| | - Jennifer Reutens-Hernandez
- Biochemistry and Molecular Biology Program, University of Northern British Columbia, Prince George, Canada
| | - Hugues B. Massicotte
- Ecosystem Science and Management Program, University of Northern British Columbia, Prince George, Canada
| | - Keith N. Egger
- Ecosystem Science and Management Program, University of Northern British Columbia, Prince George, Canada
| | - Chow H. Lee
- Biochemistry and Molecular Biology Program, University of Northern British Columbia, Prince George, Canada
| | - Geoffrey W. Payne
- Northern Medical Program, University of Northern British Columbia, Prince George, Canada
- * E-mail:
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Modified Intravital Microscopy to Assess Vascular Health and T-Cell Motility. Methods Mol Biol 2019. [PMID: 30610608 DOI: 10.1007/978-1-4939-9036-8_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
The ability to study the microcirculation in real time is key to elucidating how the immune system and the associated microvasculature interact and influence one another within the lymph node (LN). Here, we present a method for near in-situ imaging of the inguinal LN. In particular, this method is ideal for the assessment of overall vascular health that influences immune functions and for the evaluation of T-cell motility. We focus on imaging of the microvasculature of the LN, paying particular attention to methods that ensure the study of healthy vessels, the ability to maintain imaging of viable vessels over a number of hours, quantification of vessel magnitude and vessel integrity. Modified intravital microscopy (M-IVM) of the LNs allows direct evaluation of microvascular functions as well as real-time imaging of the direct interface between immune cells, the LN, and the microcirculation. Importantly, M-IVM technique can be readily combined with many other vascular and immunological techniques such as fluorescent cell labeling and assessment of sticking and rolling time as descripted. Furthermore, it can be adapted to study vasculature of other than the inguinal LN. Overall, this chapter provides a dependable method for fundamental vascular immunological assessment of LNs that is decidedly useful in a diverse range of investigations.
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Dalgaard EG, Andersen K, Svenningsen P, Hansen PBL. Biosensor cell assay for measuring real-time aldosterone-induced release of histamine from mesenteric arteries. Acta Physiol (Oxf) 2017; 219:219-226. [PMID: 26990768 DOI: 10.1111/apha.12680] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 03/14/2016] [Accepted: 03/14/2016] [Indexed: 12/18/2022]
Abstract
AIMS The aims were to develop a method for real-time detection of histamine release and to test whether incubation with aldosterone induces histamine release from isolated, perfused mice mesenteric arteries. METHODS Fura-2-loaded HEK-293 cells transfected with the histamine H1 receptor was used as a sensitive biosensor assay for histamine release from isolated mouse mesenteric arteries. Activation of the H1 receptor by histamine was measured as an increased number of intracellular Ca2+ transient peaks using fluorescence imaging. RESULTS The developed biosensor was sensitive to histamine in physiological relevant concentrations and responded to substances released by the artery preparation. Aldosterone treatment of mesenteric arteries from wild-type mice for 50 min resulted in an increased number of intracellular Ca2+ transient peaks in the biosensor cells, which was significantly inhibited by the histamine H1 blocker pyrilamine. Mesenteric arteries from mast cell-deficient SASH mice induced similar pyrilamine-sensitive Ca2+ transient response in the biosensor cells. Mesenteric arteries from wild-type and SASH mice expressed histamine decarboxylase mRNA, indicating that mast cells are not the only source of histamine release. CONCLUSION The developed biosensor assay can measure release of substances from vascular preparations. Histamine is released from the vessel preparation in response to aldosterone treatment independently of mast cells. The assay enables us to study a new signaling mechanism for vascular responses induced by aldosterone.
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Affiliation(s)
- E. G. Dalgaard
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense C Denmark
| | - K. Andersen
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense C Denmark
| | - P. Svenningsen
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense C Denmark
| | - P. B. L. Hansen
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense C Denmark
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Wang M, Shibamoto T, Kuda Y, Tanida M, Zhang T, Song J, Kurata Y. The responses of pulmonary and systemic circulation and airway to anaphylactic mediators in anesthetized BALB/c mice. Life Sci 2016; 147:77-84. [DOI: 10.1016/j.lfs.2016.01.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 12/11/2015] [Accepted: 01/21/2016] [Indexed: 11/29/2022]
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Pober JS, Sessa WC. Inflammation and the blood microvascular system. Cold Spring Harb Perspect Biol 2014; 7:a016345. [PMID: 25384307 DOI: 10.1101/cshperspect.a016345] [Citation(s) in RCA: 181] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Acute and chronic inflammation is associated with changes in microvascular form and function. At rest, endothelial cells maintain a nonthrombogenic, nonreactive surface at the interface between blood and tissue. However, on activation by proinflammatory mediators, the endothelium becomes a major participant in the generation of the inflammatory response. These functions of endothelium are modified by the other cell populations of the microvessel wall, namely pericytes, and smooth muscle cells. This article reviews recent advances in understanding the roles played by microvessels in inflammation.
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Affiliation(s)
- Jordan S Pober
- Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520-8089
| | - William C Sessa
- Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut 06520-8089
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Yoneda H, Niijima-Yaoita F, Tsuchiya M, Kumamoto H, Watanbe M, Ohtsu H, Yanai K, Tadano T, Sasaki K, Sugawara S, Endo Y. Roles played by histamine in strenuous or prolonged masseter muscle activity in mice. Clin Exp Pharmacol Physiol 2013; 40:848-55. [DOI: 10.1111/1440-1681.12167] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 08/29/2013] [Accepted: 09/02/2013] [Indexed: 11/28/2022]
Affiliation(s)
- Hiroyuki Yoneda
- Division of Oral Molecular Regulation; Graduate School of Dentistry; Tohoku University; Sendai Japan
- Division of Advanced Prosthetic Dentistry; Graduate School of Dentistry; Tohoku University; Sendai Japan
| | | | - Masahiro Tsuchiya
- Division of Aging and Geriatric Dentistry; Graduate School of Dentistry; Tohoku University; Sendai Japan
| | - Hiroyuki Kumamoto
- Division of Oral Pathology; Graduate School of Dentistry; Tohoku University; Sendai Japan
| | - Makoto Watanbe
- Division of Aging and Geriatric Dentistry; Graduate School of Dentistry; Tohoku University; Sendai Japan
| | - Hiroshi Ohtsu
- Department of Applied Quantum Medical Engineering; School of Engineering; Tohoku University; Sendai Japan
| | - Kazuhiko Yanai
- Department of Pharmacology; Graduate School of Medicine; Tohoku University; Sendai Japan
| | - Takeshi Tadano
- Laboratory of Environmental and Health Sciences; College of Medical Pharmaceutical and Health Sciences; Kanazawa University; Kanazawa Japan
| | - Keiichi Sasaki
- Division of Advanced Prosthetic Dentistry; Graduate School of Dentistry; Tohoku University; Sendai Japan
| | - Shunji Sugawara
- Division of Oral Molecular Regulation; Graduate School of Dentistry; Tohoku University; Sendai Japan
| | - Yasuo Endo
- Division of Oral Molecular Regulation; Graduate School of Dentistry; Tohoku University; Sendai Japan
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Schjerning J, Uhrenholt TR, Svenningsen P, Vanhoutte PM, Skøtt O, Jensen BL, Hansen PBL. Histamine-dependent prolongation by aldosterone of vasoconstriction in isolated small mesenteric arteries of the mouse. Am J Physiol Heart Circ Physiol 2013; 304:H1094-102. [DOI: 10.1152/ajpheart.00524.2012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In arterioles, aldosterone counteracts the rapid dilatation (recovery) following depolarization-induced contraction. The hypothesis was tested that this effect of aldosterone depends on cyclooxygenase (COX)-derived products and/or nitric oxide (NO) synthase (NOS) inhibition. Recovery of the response to high K+ was observed in mesenteric arteries of wild-type and COX-2−/− mice but it was significantly diminished in preparations from endothelial NOS (eNOS)−/− mice. Aldosterone pretreatment inhibited recovery from wild-type and COX-2−/− mice. The NO donor sodium nitroprusside (SNP) restored recovery in arteries from eNOS−/− mice, and this was inhibited by aldosterone. Actinomycin-D abolished the effect of aldosterone, indicating a genomic effect. The effect was blocked by indomethacin and by the COX-1 inhibitor valeryl salicylate but not by NS-398 (10−6 mol/l) or the TP-receptor antagonist S18886 (10−7 mol/l). The effect of aldosterone on recovery in arteries from wild-type mice and the SNP-mediated dilatation in arteries from eNOS−/− mice was inhibited by the histamine H2 receptor antagonist cimetidine. RT-PCR showed expression of mast cell markers in mouse mesenteric arteries. The adventitia displayed granular cells positive for toluidine blue vital stain. Confocal microscopy of live mast cells showed loss of quinacrine fluorescence and swelling after aldosterone treatment, indicating degranulation. RT-PCR showed expression of mineralocorticoid receptors in mesenteric arteries and in isolated mast cells. These findings suggest that aldosterone inhibits recovery by stimulation of histamine release from mast cells along mesenteric arteries. The resulting activation of H2 receptors decreases the sensitivity to NO of vascular smooth muscle cells. Aldosterone may chronically affect vascular function through paracrine release of histamine.
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Affiliation(s)
- Jeppe Schjerning
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Denmark
| | - Torben R. Uhrenholt
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Denmark
| | - Per Svenningsen
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Denmark
| | - Paul M. Vanhoutte
- Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong, China; and
- Department of Clinical Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Ole Skøtt
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Denmark
| | - Boye L. Jensen
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Denmark
| | - Pernille B. L. Hansen
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Denmark
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Niijima-Yaoita F, Tsuchiya M, Ohtsu H, Yanai K, Sugawara S, Endo Y, Tadano T. Roles of Histamine in Exercise-Induced Fatigue: Favouring Endurance and Protecting against Exhaustion. Biol Pharm Bull 2012; 35:91-7. [DOI: 10.1248/bpb.35.91] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | - Masahiro Tsuchiya
- Department of Aging and Geriatric Dentistry, Graduate School of Dentistry, Tohoku University
| | - Hiroshi Ohtsu
- Department of Applied Quantum Medical Engineering, School of Engineering, Tohoku University
| | - Kazuhiko Yanai
- Department of Pharmacology, Graduate School of Medicine, Tohoku University
| | - Shunji Sugawara
- Department of Molecular Regulation, Graduate School of Dentistry, Tohoku University
| | - Yasuo Endo
- Department of Molecular Regulation, Graduate School of Dentistry, Tohoku University
| | - Takeshi Tadano
- Department of Pharmacology, Tohoku Pharmaceutical University
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Looft-Wilson RC, Billaud M, Johnstone SR, Straub AC, Isakson BE. Interaction between nitric oxide signaling and gap junctions: effects on vascular function. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1818:1895-902. [PMID: 21835160 DOI: 10.1016/j.bbamem.2011.07.031] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Revised: 07/14/2011] [Accepted: 07/19/2011] [Indexed: 02/07/2023]
Abstract
Nitric oxide signaling, through eNOS (or possibly nNOS), and gap junction communication are essential for normal vascular function. While each component controls specific aspects of vascular function, there is substantial evidence for cross-talk between nitric oxide signaling and the gap junction proteins (connexins), and more recently, protein-protein association between eNOS and connexins. This review will examine the evidence for interaction between these pathways in normal and diseased arteries, highlight the questions that remain about the mechanisms of their interaction, and explore the possible interaction between nitric oxide signaling and the newly discovered pannexin channels. This article is part of a Special Issue entitled: The Communicating junctions, composition, structure and characteristics.
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Affiliation(s)
- R C Looft-Wilson
- Department of Kinesiology and Health Sciences, College of William and Mary, Williamsburg, VA 23187, USA
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Abstract
In the past decade, the importance of the vascular endothelium as a multifunctional regulator of vascular smooth muscle physiology and pathophysiology has been appreciated. Indeed, the endothelium responds to hemodynamic stimuli (pressure, shear stress and wall strain) and locally manufactured mediators (such as bradykinin, prostaglandins, angiotensin II and nitric oxide) that can influence blood flow, cell trafficking into tissue and angiogenesis. In this chapter, the importance of nitric oxide (NO) as a mediator of blood flow control, vascular permeability and angiogenesis will be discussed.
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Affiliation(s)
- W C Sessa
- Yale University School of Medicine, Vascular Biology & Therapeutic Program, New Haven, CT 06520, USA.
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Evora PRB, Simon MR. Role of nitric oxide production in anaphylaxis and its relevance for the treatment of anaphylactic hypotension with methylene blue. Ann Allergy Asthma Immunol 2007; 99:306-13. [PMID: 17941276 DOI: 10.1016/s1081-1206(10)60545-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To review the role of nitric oxide production in anaphylaxis. DATA SOURCES We performed MEDLINE searches of the literature. In addition, some references known to the authors but not listed in MEDLINE, such as abstracts and a CD-ROM, were included. Finally, additional clinical details of the cases were provided by one of the authors. STUDY SELECTION Primary reports were preferentially selected for inclusion. However, some secondary publications are also cited. RESULTS Histamine along with other mediators, such as leukotrienes, tumor necrosis factor, and platelet-activating factor, induce the production of nitric oxide. Nitric oxide can inhibit the release and effects of catecholamines. Sympathetic amines may inhibit production of nitric oxide. Studies in animals have demonstrated the generation of nitric oxide during anaphylaxis. Inhibition of nitric oxide synthase improves survival in an animal model of anaphylaxis. Nitric oxide causes vasodilation indirectly by increasing the activation of guanylyl cyclase, which then causes smooth muscle relaxation by increasing the concentration of smooth muscle cyclic guanosine monophosphate. Methylene blue is an inhibitor of guanylyl cyclase, which increases systemic vascular resistance and reverses shock in animal studies. The previously reported successful treatment with methylene blue of 11 patients with anaphylactic hypotension is reviewed. CONCLUSION Nitric oxide plays a significant role in the pathophysiology of anaphylaxis. Treatment with methylene blue should be considered in patients with anaphylactic hypotension that has not responded to other interventions.
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Affiliation(s)
- Paulo R B Evora
- Department of Surgery and Anatomy, Ribeirão Preto Faculty of Medicine, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
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Brookes ZLS, Stedman EN, Guerrini R, Lawton BK, Calo G, Lambert DG. Proinflammatory and vasodilator effects of nociceptin/orphanin FQ in the rat mesenteric microcirculation are mediated by histamine. Am J Physiol Heart Circ Physiol 2007; 293:H2977-85. [PMID: 17766480 DOI: 10.1152/ajpheart.00448.2007] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nociceptin/orphanin FQ (N/OFQ) is the endogenous ligand for the N/OFQ peptide receptor (NOP). N/OFQ causes hypotension and vasodilation, and we aimed to determine the role of histamine in inflammatory microvascular responses to N/OFQ. Male Wistar rats (220-300 g, n = 72) were anesthetized with thiopental (30 mg/kg bolus, 40-90 mg x kg(-1) x h(-1) iv), and the mesentery was prepared for fluorescent intravital microscopy using fluorescein isothiocyanate-conjugated BSA (FITC-BSA, 0.25 ml/100 g iv) or 1 microm fluorescently labeled microspheres. N/OFQ (0.6-60 nmol/kg iv) caused hypotension (SAP, baseline: 154 +/- 11 mmHg, 15 nmol/kg N/OFQ: 112 +/- 10 mmHg, P = 0.009), vasodilation (venules: 23.9 +/- 1.2 microm, 26.7 +/- 1.2 microm, P = 0.006), macromolecular leak (interstitial gray level FITC-BSA: 103.7 +/- 3.4, 123.5 +/- 11.8, P = 0.009), and leukocyte adhesion (2.0 +/- 0.9, 15.2 +/- 0.9/100 microm, P = 0.036). Microsphere velocity also decreased (venules: 1,230 +/- 370 microm/s, P = 0.037), but there were no significant changes in blood flow. Flow cytometry measured a concurrent increase in neutrophil expression of cd11b with N/OFQ vs. controls (Geo mean fluorescence: 4.19 +/- 0.13 vs. 2.06 +/- 0.38, P < 0.05). The NOP antagonist [Nphe(1),Arg(14),Lys(15)]N/OFQ-NH(2) (UFP-101; 60 and 150 nmol/kg iv), H(1) and H(2)antagonists pyrilamine (mepyramine, 1 mg/kg iv) and ranitidine (1 mg/kg iv), and mast cell stabilizer cromolyn (1 mg x kg(-1) x min(-1)) also abolished vasodilation and macromolecular leak to N/OFQ in vivo (P < 0.05), but did not affect hypotension. Isolated mesenteric arteries (approximately 200 microm, n = 25) preconstricted with U-46619 were also mounted on a pressure myograph (60 mmHg), and both intraluminally and extraluminally administered N/OFQ (10(-5) M) caused dilation, inhibited by pyrilamine in the extraluminal but not the intraluminal (control: -6.9 +/- 3.8%; N/OFQ: 32.6 +/- 8.4%; pyrilamine: 31.5 +/- 6.8%, n = 18, P < 0.05) experiments. We conclude that, in vivo, mesenteric microvascular dilation and macromolecular leak occur via N/OFQ-NOP-mediated release of histamine from mast cells. Therefore, N/OFQ-NOP has an important role in microvascular inflammation, and this may be targeted during disease, particularly as we have proven that UFP-101 is an effective antagonist of microvascular responses in vivo.
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Affiliation(s)
- Zoë L S Brookes
- University of Sheffield, Academic Anaesthesia Unit and Microcirculation Research Group, Royal Hallamshire Hospital, Sheffield S10 2JF, UK.
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Bucci M, Roviezzo F, Posadas I, Yu J, Parente L, Sessa WC, Ignarro LJ, Cirino G. Endothelial nitric oxide synthase activation is critical for vascular leakage during acute inflammation in vivo. Proc Natl Acad Sci U S A 2005; 102:904-8. [PMID: 15640348 PMCID: PMC545512 DOI: 10.1073/pnas.0408906102] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The role of endothelium-derived nitric oxide (NO) in acute inflammation is not known. Here, we examine acute inflammation in congenic endothelial NO synthase-deficient (eNOS-/-) mice. Intraplantar injection of carrageenan induces a biphasic inflammatory response. The early phase (0-6 h) is largely eliminated, and the secondary phase (24-96 h) is markedly reduced in eNOS-/- but not WT mice. Inhibition of phosphatidylinositol 3-kinase or hsp90, pathways upstream of eNOS activation, also reduces carrageenan-stimulated edema formation. To separate the ability of eNOS to regulate leukocyte trafficking vs. vascular permeability, zymosan-stimulated leukocyte infiltration and protein extravasation were assessed in WT and eNOS-/- mice. Zymosan increases inflammatory cell extravasation to the same extent in WT and eNOS-/- mice, whereas the extravasation of plasma protein is lower in eNOS-/- mice. Inhibition of phosphatidylinositol 3-kinase and hsp90 also blocks protein leakage, but not leukocyte influx. These data collectively support the critical role for eNOS in regulating the magnitude of the acute inflammatory response and show that eNOS is critical for regulating microcirculatory endothelial barrier function in vivo.
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Affiliation(s)
- Mariarosaria Bucci
- Dipartimento di Farmacologia Sperimentale, Via Domenico Montesano 49, Università di Napoli-Federico II, 80131 Naples, Italy
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