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Li L, Jasmer KJ, Camden JM, Woods LT, Martin AL, Yang Y, Layton M, Petris MJ, Baker OJ, Weisman GA, Petris CK. Early Dry Eye Disease Onset in a NOD.H-2h4 Mouse Model of Sjögren's Syndrome. Invest Ophthalmol Vis Sci 2022; 63:18. [PMID: 35727180 PMCID: PMC9233292 DOI: 10.1167/iovs.63.6.18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Purpose To develop a mouse model of human dry eye disease (DED) for investigation of sex differences in autoimmune-associated dry eye pathology. Methods Ocular surface disease was assessed by quantifying corneal epithelial damage with lissamine green stain in the NOD.H-2h4,IFNγ−/−,CD28−/− (NOD.H-2h4 DKO) mouse model of Sjögren's syndrome (SS). Lacrimal gland function was assessed by tear volume quantification with phenol red thread and lacrimal gland inflammation (i.e., dacryoadenitis) was assessed by quantification of immune cell foci, flow cytometric analysis of immune cell composition, and expression of proinflammatory markers. Results The NOD.H-2h4 DKO mouse model of SS exhibits greater age-dependent increases in corneal damage than in NOD.H-2h4 parental mice and demonstrates an earlier disease onset in females compared to males. The severity of ocular surface disease correlates with loss of goblet cell density, increased conjunctivitis, and dacryoadenitis that is more pronounced in NOD.H-2h4 DKO than NOD.H-2h4 mice. B cells dominate lacrimal infiltrates in 16-week-old NOD.H-2h4 and NOD.H-2h4 DKO mice, but T helper cells and macrophages are also present. Lacrimal gland expression of proinflammatory genes, including the P2X7 and P2Y2 purinergic receptors, is greater in NOD.H-2h4 DKO than NOD.H-2h4 mice and correlates with dacryoadenitis. Conclusions Our results demonstrate for the first time that autoimmune dry eye disease occurs in both sexes of NOD.H-2h4 DKO and NOD.H-2h4 mice, with earlier onset in female NOD.H-2h4 DKO mice when compared to males of the same strain. This study demonstrates that both NOD.H-2h4 and NOD.H-2h4 DKO mice are novel models that closely resemble SS-related and sex-dependent DED.
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Affiliation(s)
- Lili Li
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States.,Visual Science and Optometry Center, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China
| | - Kimberly J Jasmer
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States
| | - Jean M Camden
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States
| | - Lucas T Woods
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States
| | - Adam L Martin
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States
| | - Yong Yang
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States.,Department of Ophthalmology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Maria Layton
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Division of Biological Sciences, University of Missouri, Columbia, Missouri, United States
| | - Michael J Petris
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States.,Department of Ophthalmology, University of Missouri, Columbia, Missouri, United States
| | - Olga J Baker
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States.,Department of Otolaryngology-Head and Neck Surgery, University of Missouri, Columbia, Missouri, United States
| | - Gary A Weisman
- Division of Biochemistry, University of Missouri, Columbia, Missouri, United States.,Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States
| | - Carisa K Petris
- Department of Ophthalmology, University of Missouri, Columbia, Missouri, United States.,Mason Eye Institute, University of Missouri, Columbia, Missouri, United States
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Eun SY, Ko YS, Park SW, Chang KC, Kim HJ. IL-1β enhances vascular smooth muscle cell proliferation and migration via P2Y2 receptor-mediated RAGE expression and HMGB1 release. Vascul Pharmacol 2015; 72:108-17. [PMID: 25956731 DOI: 10.1016/j.vph.2015.04.013] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 03/31/2015] [Accepted: 04/20/2015] [Indexed: 01/11/2023]
Abstract
Vascular smooth muscle cells (VSMCs) are the major cell type in blood vessel walls, and their proliferation and migration play important roles in the development of atherosclerosis. Recently, it has been reported that IL-1β mediates the inflammatory response through the upregulation of the P2Y2 receptor (P2Y2R). Thus, we examined the role of P2Y2R in IL-1β-mediated proliferation and migration of VSMCs and the underlying molecular mechanisms. VSMCs were pretreated with IL-1β for 24h to upregulate P2Y2R expression. The cells were then stimulated with UTP or ATP for the indicated times, and cell proliferation and migration and the related signaling pathways were examined. The equipotent P2Y2R agonists ATP and UTP enhanced proliferation, RAGE expression and HMGB1 secretion in IL-1β-pretreated VSMCs. Additionally, pretreatment with IL-1β enhanced UTP-mediated VSMC migration and MMP-2 release, but these effects were not observed in the P2Y2R-siRNA- or RAGE-siRNA-transfected VSMCs. Next, the signaling molecules involved in P2Y2R-mediated cell proliferation and migration were determined. The ERK, AKT, PKC, Rac-1 and ROCK2 pathways were involved in UTP-induced cell proliferation and migration, MMP-2 and HMGB1 secretion and RAGE expression in the IL-1β-pretreated VSMCs. UTP induced the phosphorylation of ERK, AKT and PKC and the translocation of Rac-1 and ROCK2 from cytosol to membrane as well as stress fiber formation, which were markedly increased in the IL-1β-pretreated VSMCs but not in the P2Y2R-siRNA-transfected VSMCs. These results demonstrate that pro-inflammatory cytokines associated with atherosclerosis, such as IL-1β, can accelerate the process of atherosclerosis through the upregulation of P2Y2R.
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Affiliation(s)
- So Young Eun
- Department of Pharmacology, School Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Republic of Korea
| | - Young Shin Ko
- Department of Pharmacology, School Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Republic of Korea
| | - Sang Won Park
- Department of Pharmacology, School Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Republic of Korea
| | - Ki Churl Chang
- Department of Pharmacology, School Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Republic of Korea
| | - Hye Jung Kim
- Department of Pharmacology, School Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Republic of Korea.
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Yashima S, Shimazaki A, Mitoma J, Nakagawa T, Abe M, Yamada H, Higashi H. Close association of B2 bradykinin receptors with P2Y2 ATP receptors. J Biochem 2015; 158:155-63. [PMID: 25713410 DOI: 10.1093/jb/mvv022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 02/10/2015] [Indexed: 11/12/2022] Open
Abstract
Two G-protein-coupled receptors (GPCRs) that couple with Gαq/11, B2 bradykinin (BK) receptor (B2R) and ATP/UTP receptor P2Y2 (P2Y2R), are ubiquitously expressed and responsible for vascular tone, inflammation, and pain. We analysed the cellular signalling of P2Y2Rs in cells that express B2Rs. B2R desensitization induced by BK or B2R internalization-inducing glycans cross-desensitized the P2Y2R response to ATP/UTP. Fluorescence resonance energy transfer from P2Y2R-AcGFP to B2R-DsRed was detected in the cells and on the cell surfaces, showing the close association of these GPCRs. BK- and ATP-induced cross-internalization of P2Y2R and B2R, respectively, was shown in a β-galactosidase complementation assay using P2Y2R or B2R fused to the H31R substituted α donor peptide of a β-galactosidase reporter enzyme (P2Y2R-α or B2R-α) with coexpression of the FYVE domain of endofin, an early endosome protein, fused to the M15 acceptor deletion mutant of β-galactosidase (the ω peptide, FYVE-ω). Arrestin recruitment to the GPCRs by cross-activation was also shown with the similar way. Coimmunoprecipitation showed that B2R and P2Y2R were closely associated in the cotransfected cells. These results indicate that B2R couples with P2Y2R and that these GPCRs act together to fine-tune cellular responsiveness. The collaboration between these receptors may permit rapid onset and turning off of biological events.
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Affiliation(s)
- Sayo Yashima
- Division of Glyco-Signal Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Miyagi 981-8558, Japan
| | - Ayaka Shimazaki
- Division of Glyco-Signal Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Miyagi 981-8558, Japan
| | - Junya Mitoma
- Division of Glyco-Signal Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Miyagi 981-8558, Japan
| | - Tetsuto Nakagawa
- Division of Glyco-Signal Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Miyagi 981-8558, Japan
| | - Maya Abe
- Division of Glyco-Signal Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Miyagi 981-8558, Japan
| | - Hiroyuki Yamada
- Division of Glyco-Signal Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Miyagi 981-8558, Japan
| | - Hideyoshi Higashi
- Division of Glyco-Signal Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Miyagi 981-8558, Japan
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Bone marrow-derived mesenchymal stem cells migrate to healthy and damaged salivary glands following stem cell infusion. Int J Oral Sci 2014; 6:154-61. [PMID: 24810808 PMCID: PMC4170149 DOI: 10.1038/ijos.2014.23] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/27/2014] [Indexed: 12/16/2022] Open
Abstract
Xerostomia is a severe side effect of radiation therapy in head and neck cancer patients. To date, no satisfactory treatment option has been established. Because mesenchymal stem cells (MSCs) have been identified as a potential treatment modality, we aimed to evaluate stem cell distribution following intravenous and intraglandular injections using a surgical model of salivary gland damage and to analyse the effects of MSC injections on the recruitment of immune cells. The submandibular gland ducts of rats were surgically ligated. Syngeneic adult MSCs were isolated, immortalised by simian virus 40 (SV40) large T antigen and characterized by flow cytometry. MSCs were injected intravenously and intraglandularly. After 1, 3 and 7 days, the organs of interest were analysed for stem cell recruitment. Inflammation was analysed by immunohistochemical staining. We were able to demonstrate that, after intravenous injection, MSCs were recruited to normal and damaged submandibular glands on days 1, 3 and 7. Unexpectedly, stem cells were recruited to ligated and non-ligated glands in a comparable manner. After intraglandular injection of MSCs into ligated glands, the presence of MSCs, leucocytes and macrophages was enhanced, compared to intravenous injection of stem cells. Our data suggest that injected MSCs were retained within the inflamed glands, could become activated and subsequently recruited leucocytes to the sites of tissue damage.
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Eun SY, Park SW, Lee JH, Chang KC, Kim HJ. P2Y(2)R activation by nucleotides released from oxLDL-treated endothelial cells (ECs) mediates the interaction between ECs and immune cells through RAGE expression and reactive oxygen species production. Free Radic Biol Med 2014; 69:157-66. [PMID: 24486339 DOI: 10.1016/j.freeradbiomed.2014.01.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 01/14/2014] [Accepted: 01/20/2014] [Indexed: 10/25/2022]
Abstract
Lipoprotein oxidation, inflammation, and immune responses involving the vascular endothelium and immune cells contribute to the pathogenesis of atherosclerosis. In an atherosclerotic animal model, P2Y2 receptor (P2Y2R) upregulation and stimulation were previously shown to induce intimal hyperplasia and increased intimal monocyte infiltration. Thus, we investigated the role of P2Y2R in oxidized low-density lipoprotein (oxLDL)-mediated oxidative stress and the subsequent interaction between endothelial cells (ECs) and immune cells. The treatment of human ECs with oxLDL caused the rapid release of ATP (maximum after 5 min). ECs treated with oxLDL or the P2Y2R agonists ATP/UTP for 1h exhibited significant reactive oxygen species (ROS) production, but this effect was not observed in P2Y2R siRNA-transfected ECs. In addition, oxLDL and ATP/UTP both induced RAGE expression, which was P2Y2R dependent. Oxidized LDL- and ATP/UTP-mediated ROS production was diminished in RAGE siRNA-transfected ECs, suggesting that RAGE is an important mediator in P2Y2R-mediated ROS production. Treatment with oxLDL for 24h induced P2Y2R expression in the human monocyte cell line THP-1 and increased THP-1 cell migration toward ECs. The addition of apyrase, an enzyme that hydrolyzes nucleotides, or diphenyleneiodonium (DPI), a well-known inhibitor of NADPH oxidase, significantly inhibited the increase in cell migration caused by oxLDL. P2Y2R siRNA-transfected THP-1 cells did not migrate in response to oxLDL or ATP/UTP treatment, indicating a critical role for P2Y2R and nucleotide release in oxLDL-induced monocyte migration. Last, oxLDL and ATP/UTP effectively increased ICAM-1 and VCAM-1 expression and the subsequent binding of THP-1 cells to ECs, which was inhibited by pretreatment with DPI or by siRNA against P2Y2R or RAGE, suggesting that P2Y2R is an important mediator in oxLDL-mediated monocyte adhesion to ECs through the regulation of ROS-dependent adhesion molecule expression in ECs. Taken together, our findings suggest that P2Y2R could be a therapeutic target for the prevention of vascular disorders, including atherosclerosis.
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Affiliation(s)
- So Young Eun
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-701, Korea
| | - Sang Won Park
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-701, Korea
| | - Jae Heun Lee
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-701, Korea
| | - Ki Churl Chang
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-701, Korea
| | - Hye Jung Kim
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-701, Korea.
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Lee MG, Ohana E, Park HW, Yang D, Muallem S. Molecular mechanism of pancreatic and salivary gland fluid and HCO3 secretion. Physiol Rev 2012; 92:39-74. [PMID: 22298651 DOI: 10.1152/physrev.00011.2011] [Citation(s) in RCA: 267] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Fluid and HCO(3)(-) secretion is a vital function of all epithelia and is required for the survival of the tissue. Aberrant fluid and HCO(3)(-) secretion is associated with many epithelial diseases, such as cystic fibrosis, pancreatitis, Sjögren's syndrome, and other epithelial inflammatory and autoimmune diseases. Significant progress has been made over the last 20 years in our understanding of epithelial fluid and HCO(3)(-) secretion, in particular by secretory glands. Fluid and HCO(3)(-) secretion by secretory glands is a two-step process. Acinar cells secrete isotonic fluid in which the major salt is NaCl. Subsequently, the duct modifies the volume and electrolyte composition of the fluid to absorb the Cl(-) and secrete HCO(3)(-). The relative volume secreted by acinar and duct cells and modification of electrolyte composition of the secreted fluids varies among secretory glands to meet their physiological functions. In the pancreas, acinar cells secrete a small amount of NaCl-rich fluid, while the duct absorbs the Cl(-) and secretes HCO(3)(-) and the bulk of the fluid in the pancreatic juice. Fluid secretion appears to be driven by active HCO(3)(-) secretion. In the salivary glands, acinar cells secrete the bulk of the fluid in the saliva that is driven by active Cl(-) secretion and contains high concentrations of Na(+) and Cl(-). The salivary glands duct absorbs both the Na(+) and Cl(-) and secretes K(+) and HCO(3)(-). In this review, we focus on the molecular mechanism of fluid and HCO(3)(-) secretion by the pancreas and salivary glands, to highlight the similarities of the fundamental mechanisms of acinar and duct cell functions, and to point out the differences to meet gland-specific secretions.
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Affiliation(s)
- Min Goo Lee
- Department of Pharmacology, Yonsei University College of Medicine, Seoul, Korea
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Bhattacharya S, Verrill DS, Carbone KM, Brown S, Yule DI, Giovannucci DR. Distinct contributions by ionotropic purinoceptor subtypes to ATP-evoked calcium signals in mouse parotid acinar cells. J Physiol 2012; 590:2721-37. [PMID: 22451435 DOI: 10.1113/jphysiol.2012.228148] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
There is emerging consensus that P2X₄ and P2X₇ ionotropic purinoceptors (P2X₄R and P2X₇R) are critical players in regulating [Ca²⁺]i dynamics and fluid secretion in the salivary gland. In contrast, details regarding their compartmentalization and selective activation, contributions to the spatiotemporal properties of intracellular signals and roles in regulating protein exocytosis and ion channel activity have remained largely undefined. To address these concerns, we profiled mouse parotid acinar cells using live-cell imaging to follow the spatial and temporal features of ATP-evoked Ca²⁺ dynamics and exocytotic activity. Selective activation of P2X7Rs revealed an apical-to-basal [Ca²⁺]i signal that initiated at the sub-luminal border and propagated with a wave speed estimated at 17.3 ± 4.3 μm s⁻¹ (n =6). The evoked Ca²⁺ spike consisted of Ca²⁺ influx and Ca²⁺-induced Ca²⁺ release from intracellular Ca²⁺ channels. In contrast, selective activation of P2X₄Rs induced a Ca²⁺ signal that initiated basally and propagated toward the lumen with a wave speed of 4.3 ± 0.2 μm s⁻¹ (n =8) that was largely independent of intracellular Ca²⁺ channel blockade. Consistent with these observations, P2X₇R expression was enriched in the sub-luminal regions of acinar cells while P2X₄R appeared localized to basal areas. In addition, we showed that P2X₄R and P2X₇R activation evokes exocytosis in parotid acinar cells. Our studies also demonstrate that the P2X₄R-mediated [Ca²⁺]i rise and subsequent protein exocytosis was enhanced by ivermectin (IVR). Thus, in addition to furthering our understanding of salivary gland physiology, this study identifies P2X₄R as a potential target for treatment of salivary hypofunction diseases.
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Affiliation(s)
- Sumit Bhattacharya
- Department of Neurosciences, University of Toledo College of Medicine, Toledo, OH, USA
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Kim HJ, Ajit D, Peterson TS, Wang Y, Camden JM, Gibson Wood W, Sun GY, Erb L, Petris M, Weisman GA. Nucleotides released from Aβ₁₋₄₂ -treated microglial cells increase cell migration and Aβ₁₋₄₂ uptake through P2Y₂ receptor activation. J Neurochem 2012; 121:228-38. [PMID: 22353164 DOI: 10.1111/j.1471-4159.2012.07700.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Amyloid β-protein (Aβ) deposits in brains of Alzheimer's disease patients generate proinflammatory cytokines and chemokines that recruit microglial cells to phagocytose Aβ. Nucleotides released from apoptotic cells activate P2Y(2) receptors (P2Y(2) Rs) in macrophages to promote clearance of dead cells. In this study, we investigated the role of P2Y(2) Rs in the phagocytosis and clearance of Aβ. Treatment of mouse primary microglial cells with fibrillar (fAβ(1-42) ) and oligomeric (oAβ(1-42) ) Aβ(1-42) aggregation solutions caused a rapid release of ATP (maximum after 10 min). Furthermore, fAβ(1-42) and oAβ(1-42) treatment for 24 h caused an increase in P2Y(2) R gene expression. Treatment with fAβ(1-42) and oAβ(1-42) aggregation solutions increased the motility of neighboring microglial cells, a response inhibited by pre-treatment with apyrase, an enzyme that hydrolyzes nucleotides. The P2Y(2) R agonists ATP and UTP caused significant uptake of Aβ(1-42) by microglial cells within 30 min, which reached a maximum within 1 h, but did not increase Aβ(1-42) uptake by primary microglial cells isolated from P2Y(2) R(-/-) mice. Inhibitors of α(v) integrins, Src and Rac decreased UTP-induced Aβ(1-42) uptake, suggesting that these previously identified components of the P2Y(2) R signaling pathway play a role in Aβ phagocytosis by microglial cells. Finally, we found that UTP treatment enhances Aβ(1-42) degradation by microglial cells, but not in cells isolated from P2Y(2) R(-/-) mice. Taken together, our findings suggest that P2Y(2) Rs can activate microglial cells to enhance Aβ clearance and highlight the P2Y(2) R as a therapeutic target in Alzheimer's disease.
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Affiliation(s)
- Hye Jung Kim
- Department of Biochemistry, University of Missouri, Columbia, Missouri, USA
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Seil M, El Ouaaliti M, Fontanils U, Etxebarria IG, Pochet S, Dal Moro G, Marino A, Dehaye JP. Ivermectin-dependent release of IL-1beta in response to ATP by peritoneal macrophages from P2X(7)-KO mice. Purinergic Signal 2010; 6:405-16. [PMID: 21437011 DOI: 10.1007/s11302-010-9205-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Accepted: 11/01/2010] [Indexed: 01/01/2023] Open
Abstract
The response to ATP of peritoneal macrophages from wild-type (WT) and P2X(7)-invalidated (KO) mice was tested. Low concentrations (1-100 μM) of ATP transiently increased the intracellular concentration of calcium ([Ca(2+)](i)) in cells from both mice. The inhibition of the polyphosphoinositide-specific phospholipase C with U73122 inhibited this response especially in WT mice suggesting that the responses coupled to P2Y receptors were potentiated by the expression of P2X(7) receptors. One millimolar ATP provoked a sustained increase in the [Ca(2+)](i) only in WT mice. The response to 10 μM ATP was potentiated and prolonged by ivermectin in both mice. One millimolar ATP increased the influx of extracellular calcium, decreased the intracellular concentration of potassium ([K(+)](i)) and stimulated the secretion of interleukin-1β (IL-1β) only in cells from WT mice. Ten micromolar ATP in combination with 3 μM ivermectin reproduced these responses both in WT and KO mice. The secretion of IL-1β was also increased by nigericin in WT mice and the secretory effect of a combination of ivermectin with ATP in KO mice was suppressed in a medium containing a high concentration of potassium. In WT mice, 150 μM BzATP stimulated the uptake of YOPRO-1. Incubation of macrophages from WT and KO mice with 10 μM ATP resulted in a small increase of YOPRO-1 uptake, which was potentiated by addition of 3 μM ivermectin. The uptake of this dye was unaffected by pannexin-1 blockers. In conclusion, prolonged stimulation of P2X(4) receptors by a combination of low concentrations of ATP plus ivermectin produced a sustained activation of the non-selective cation channel coupled to this receptor. The ensuing variations of the [K(+)](i) triggered the secretion of IL-1β. Pore formation was also triggered by activation of P2X(4) receptors. Higher concentrations of ATP elicited similar responses after binding to P2X(7) receptors. The expression of the P2X(7) receptors was also coupled to a better response to P2Y receptors.
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Extracellular ATP and P2Y2 receptors mediate intercellular Ca(2+) waves induced by mechanical stimulation in submandibular gland cells: Role of mitochondrial regulation of store operated Ca(2+) entry. Cell Calcium 2010; 47:65-76. [PMID: 20022109 DOI: 10.1016/j.ceca.2009.11.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2009] [Revised: 11/13/2009] [Accepted: 11/17/2009] [Indexed: 12/29/2022]
Abstract
Coordination of Ca(2+) signaling among cells contributes to synchronization of salivary gland cell function. However, mechanisms that underlie this signaling remain elusive. Here, intercellular Ca(2+) waves (ICW) in submandibular gland cells were investigated using Fura-2 fluorescence imaging. Mechanical stimulation of single cells induced ICW propagation from the stimulated cells through approximately 7 layers of cells or approximately 120microm. Our findings indicate that an extracellular ATP-dependent pathway is involved because the purinergic receptor antagonist suramin and the ATP hydrolyzing enzyme apyrase blocked ICW propagation. However, the gap junction uncoupler oleamide had no effect. ATP is released from mechanically stimulated cells possibly through opening of mechanosensitive maxi-anion channels, and does not appear to be directly linked to cytosolic Ca(2+). The ICW is propagated by diffusing ATP, which activates purinergic receptors in neighboring cells. This purinergic signaling induces a Ca(2+) transient that is dependent on Ca(2+) release via IP(3) receptors in the ER and store operated Ca(2+) entry (SOCE). Finally, inhibition of mitochondrial Ca(2+) uptake modified ICW indicating an important role of these organelles in this phenomenon. These studies increase our understanding of purinergic receptor signaling in salivary gland cells, and its role as a coordination mechanism of Ca(2+) signals induced by mechanical stimulation.
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Kong Q, Peterson TS, Baker O, Stanley E, Camden J, Seye CI, Erb L, Simonyi A, Wood WG, Sun GY, Weisman GA. Interleukin-1beta enhances nucleotide-induced and alpha-secretase-dependent amyloid precursor protein processing in rat primary cortical neurons via up-regulation of the P2Y(2) receptor. J Neurochem 2009; 109:1300-10. [PMID: 19317852 DOI: 10.1111/j.1471-4159.2009.06048.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The heterologous expression and activation of the human P2Y(2) nucleotide receptor (P2Y(2)R) in human 1321N1 astrocytoma cells stimulates alpha-secretase-dependent cleavage of the amyloid precursor protein (APP), causing extracellular release of the non-amyloidogenic protein secreted amyloid precursor protein (sAPPalpha). To determine whether a similar response occurs in a neuronal cell, we analyzed whether P2Y(2)R-mediated production of sAPPalpha occurs in rat primary cortical neurons (rPCNs). In rPCNs, P2Y(2)R mRNA and receptor activity were virtually absent in quiescent cells, whereas overnight treatment with the pro-inflammatory cytokine interleukin-1beta (IL-1beta) up-regulated both P2Y(2)R mRNA expression and receptor activity by four-fold. The up-regulation of the P2Y(2)R was abrogated by pre-incubation with Bay 11-7085, an IkappaB-alpha phosphorylation inhibitor, which suggests that P2Y(2)R mRNA transcript levels are regulated through nuclear factor-kappa-B (NFkappaB) signaling. Furthermore, the P2Y(2)R agonist Uridine-5'-triphosphate (UTP) enhanced the release of sAPPalpha in rPCNs treated with IL-1beta or transfected with P2Y(2)R cDNA. UTP-induced release of sAPPalpha from rPCNs was completely inhibited by pre-treatment of the cells with the metalloproteinase inhibitor TACE inhibitor (TAPI-2) or the phosphatidylinositol 3-kinase (PI3K) inhibitor LY294002, and was partially inhibited by the MAPK/extracellular signal-regulated kinase inhibitor U0126 and the protein kinase C inhibitor GF109203. These data suggest that P2Y(2)R-mediated release of sAPPalpha from cortical neurons is directly dependent on a disintegrin and metalloproteinase (ADAM) 10/17 and PI3K activity, whereas extracellular signal-regulated kinase 1/2 and PI3K activity may indirectly regulate APP processing. These results demonstrate that elevated levels of pro-inflammatory cytokines associated with neurodegenerative diseases, such as IL-1beta, can enhance non-amyloidogenic APP processing through up-regulation of the P2Y(2)R in neurons.
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Affiliation(s)
- Qiongman Kong
- Interdisciplinary Neuroscience Program, University of Missouri, Columbia, Missouri, USA
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12
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Abbracchio MP, Burnstock G, Boeynaems JM, Barnard EA, Boyer JL, Kennedy C, Knight GE, Fumagalli M, Gachet C, Jacobson KA, Weisman GA. International Union of Pharmacology LVIII: update on the P2Y G protein-coupled nucleotide receptors: from molecular mechanisms and pathophysiology to therapy. Pharmacol Rev 2006; 58:281-341. [PMID: 16968944 PMCID: PMC3471216 DOI: 10.1124/pr.58.3.3] [Citation(s) in RCA: 974] [Impact Index Per Article: 54.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
There have been many advances in our knowledge about different aspects of P2Y receptor signaling since the last review published by our International Union of Pharmacology subcommittee. More receptor subtypes have been cloned and characterized and most orphan receptors de-orphanized, so that it is now possible to provide a basis for a future subdivision of P2Y receptor subtypes. More is known about the functional elements of the P2Y receptor molecules and the signaling pathways involved, including interactions with ion channels. There have been substantial developments in the design of selective agonists and antagonists to some of the P2Y receptor subtypes. There are new findings about the mechanisms underlying nucleotide release and ectoenzymatic nucleotide breakdown. Interactions between P2Y receptors and receptors to other signaling molecules have been explored as well as P2Y-mediated control of gene transcription. The distribution and roles of P2Y receptor subtypes in many different cell types are better understood and P2Y receptor-related compounds are being explored for therapeutic purposes. These and other advances are discussed in the present review.
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Affiliation(s)
- Maria P Abbracchio
- Department of Pharmacological Sciences, University of Milan, Milan, Italy
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13
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Weisman GA, Wang M, Kong Q, Chorna NE, Neary JT, Sun GY, González FA, Seye CI, Erb L. Molecular determinants of P2Y2 nucleotide receptor function: implications for proliferative and inflammatory pathways in astrocytes. Mol Neurobiol 2006; 31:169-83. [PMID: 15953819 DOI: 10.1385/mn:31:1-3:169] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2004] [Accepted: 11/15/2004] [Indexed: 01/05/2023]
Abstract
In the mammalian nervous system, P2 nucleotide receptors mediate neurotransmission, release of proinflammatory cytokines, and reactive astrogliosis. Extracellular nucleotides activate multiple P2 receptors in neurons and glial cells, including G protein-coupled P2Y receptors and P2X receptors, which are ligand-gated ion channels. In glial cells, the P2Y2 receptor subtype, distinguished by its ability to be equipotently activated by ATP and UTP, is coupled to pro-inflammatory signaling pathways. In situ hybridization studies with rodent brain slices indicate that P2Y2 receptors are expressed primarily in the hippocampus and cerebellum. Astrocytes express several P2 receptor subtypes, including P2Y2 receptors whose activation stimulates cell proliferation and migration. P2Y2 receptors, via an RGD (Arg-Gly-Asp) motif in their first extracellular loop, bind to alphavbeta3/beta5 integrins, whereupon P2Y2 receptor activation stimulates integrin signaling pathways that regulate cytoskeletal reorganization and cell motility. The C-terminus of the P2Y2 receptor contains two Src-homology-3 (SH3)-binding domains that upon receptor activation, promote association with Src and transactivation of growth factor receptors. Together, our results indicate that P2Y2 receptors complex with both integrins and growth factor receptors to activate multiple signaling pathways. Thus, P2Y2 receptors present novel targets to control reactive astrogliosis in neurodegenerative diseases.
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Affiliation(s)
- Gary A Weisman
- Department of Biochemistry and Neuroscience Program, University of Missouri-Columbia, Columbia, MO, USA.
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14
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Wang M, Kong Q, Gonzalez FA, Sun G, Erb L, Seye C, Weisman GA. P2Y nucleotide receptor interaction with alpha integrin mediates astrocyte migration. J Neurochem 2005; 95:630-40. [PMID: 16135088 DOI: 10.1111/j.1471-4159.2005.03408.x] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Astrocytes become activated in response to brain injury, as characterized by increased expression of glial fibrillary acidic protein (GFAP) and increased rates of cell migration and proliferation. Damage to brain cells causes the release of cytoplasmic nucleotides, such as ATP and uridine 5'-triphosphate (UTP), ligands for P2 nucleotide receptors. Results in this study with primary rat astrocytes indicate that activation of a G protein-coupled P2Y(2) receptor for ATP and UTP increases GFAP expression and both chemotactic and chemokinetic cell migration. UTP-induced astrocyte migration was inhibited by silencing of P2Y(2) nucleotide receptor (P2Y(2)R) expression with siRNA of P2Y(2)R (P2Y(2)R siRNA). UTP also increased the expression in astrocytes of alpha(V)beta(3/5) integrins that are known to interact directly with the P2Y(2)R to modulate its function. Anti-alpha(V) integrin antibodies prevented UTP-stimulated astrocyte migration, suggesting that P2Y(2)R/alpha(V) interactions mediate the activation of astrocytes by UTP. P2Y(2)R-mediated astrocyte migration required the activation of the phosphatidylinositol-3-kinase (PI3-K)/protein kinase B (Akt) and the mitogen-activated protein kinase/extracellular signal-regulated kinase (MEK/ERK) signaling pathways, responses that also were inhibited by anti-alpha(V) integrin antibody. These results suggest that P2Y(2)Rs and their associated signaling pathways may be important factors regulating astrogliosis in brain disorders.
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Affiliation(s)
- Min Wang
- Interdisciplinary Neuroscience Program, University of Missouri-Columbia, Missouri 65211, USA
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15
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Brown DA, Bruce JIE, Straub SV, Yule DI. cAMP potentiates ATP-evoked calcium signaling in human parotid acinar cells. J Biol Chem 2004; 279:39485-94. [PMID: 15262999 DOI: 10.1074/jbc.m406201200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In salivary acinar cells, intracellular calcium ([Ca(2+)](i)) signaling plays an important role in eliciting fluid secretion through the activation of Ca(2+)-activated ionic conductances. Ca(2+) and cAMP have synergistic effects on fluid secretion such that peak secretion is elicited following activation of both parasympathetic and sympathetic pathways. We have recently demonstrated that cAMP exerts effects on Ca(2+) release, through protein kinase A (PKA)-mediated phosphorylation of inositol 1,4,5-trisphosphate receptors (InsP(3)R) in mouse parotid acinar cells. To extend these findings, in the present study cross-talk between Ca(2+) signaling and cAMP pathways in human parotid acinar cells was investigated. In human parotid acinar cells, carbachol stimulation evoked increases in the [Ca(2+)](i) and the initial peak amplitude was enhanced following PKA activation, consistent with reports from mouse parotid. Stimulation with ATP also evoked an increase in [Ca(2+)](i). The ATP-evoked Ca(2+) elevation was largely dependent on extracellular Ca(2+), suggesting the involvement of the P2X family of purinergic receptors. Pharmacological elevation of cAMP resulted in a approximately 5-fold increase in the peak [Ca(2+)](i) change evoked by ATP stimulation. This enhanced [Ca(2+)](i) increase was not dependent on intracellular release from InsP(3)R or ryanodine receptors, suggesting a direct effect on P2XR. Reverse transcription-polymerase chain reaction and Western blot analysis confirmed the presence of P2X(4)R and P2X(7)R mRNA and protein in human parotid acinar cells. ATP-activated cation currents were studied using whole cell patch clamp techniques in HEK-293 cells, a null background for P2XR. Raising cAMP resulted in a approximately 4.5-fold enhancement of ATP-activated current in HEK-293 cells transfected with P2X(4)R DNA but had no effects on currents in cells expressing P2X(7)R. These data indicate that in human parotid acinar cells, in addition to modulation of Ca(2+) release, Ca(2+) influx through P2X(4)R may constitute a further locus for the synergistic effects of Ca(2+) and PKA activation.
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Affiliation(s)
- David A Brown
- Department of Pharmacology & Physiology, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642, USA
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16
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Seye CI, Yu N, Jain R, Kong Q, Minor T, Newton J, Erb L, González FA, Weisman GA. The P2Y2 nucleotide receptor mediates UTP-induced vascular cell adhesion molecule-1 expression in coronary artery endothelial cells. J Biol Chem 2003; 278:24960-5. [PMID: 12714597 DOI: 10.1074/jbc.m301439200] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
P2Y2 receptor up-regulation and activation induces intimal hyperplasia and monocyte/macrophage infiltration in the collared rabbit carotid artery model of vascular injury, suggesting a potential role for P2Y2 receptors in monocyte recruitment by vascular endothelium. In this study, we addressed the hypothesis that activation of P2Y2 receptors by extracellular nucleotides modulates the expression of adhesion molecules on vascular endothelial cells that are important for monocyte recruitment. Results indicated that the equipotent P2Y2 receptor agonists UTP or ATP (1-100 microm) stimulated the expression of vascular cell adhesion molecule-1 (VCAM-1) in human coronary artery endothelial cells (HCAEC) in a time- and dose-dependent manner. P2Y2 antisense oligonucleotides inhibited VCAM-1 expression induced by UTP but not by tumor necrosis factor-alpha. Furthermore, UTP induced VCAM-1 expression in human 1321N1 astrocytoma cell transfectants expressing the recombinant P2Y2 receptor, whereas vector-transfected control cells did not respond to UTP. The effect of UTP on VCAM-1 expression in HCAEC was prevented by depletion of intracellular calcium stores with thapsigargin or by inhibition of p38 mitogen-activated protein kinase or Rho kinase, but was not affected by inhibitors of the mitogen-activated protein/extracellular signal-regulated kinase pathway (i.e. MEK1/2). Consistent with a role for VCAM-1 in the recruitment of monocytes, UTP or ATP increased the adherence of monocytic U937 cells to HCAEC, an effect that was inhibited by anti-VCAM-1 antibodies. These findings suggest a novel role for the P2Y2 receptor in the p38- and Rho kinase-dependent expression of VCAM-1 that mediates the recruitment of monocytes by vascular endothelium associated with the development of atherosclerosis.
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Affiliation(s)
- Cheikh I Seye
- Department of Biochemistry, University of Missouri, Columbia 65212, USA.
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17
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Seye CI, Kong Q, Erb L, Garrad RC, Krugh B, Wang M, Turner JT, Sturek M, González FA, Weisman GA. Functional P2Y2 nucleotide receptors mediate uridine 5'-triphosphate-induced intimal hyperplasia in collared rabbit carotid arteries. Circulation 2002; 106:2720-6. [PMID: 12438299 DOI: 10.1161/01.cir.0000038111.00518.35] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Extracellular uridine 5'-triphosphate (UTP) induces mitogenic activation of smooth muscle cells (SMCs) through binding to P2Y2 nucleotide receptors. P2Y2 receptor mRNA is upregulated in intimal lesions of rat aorta, but it is unclear how this G-protein-coupled receptor contributes to development of intimal hyperplasia. METHODS AND RESULTS This study used a silicone collar placed around rabbit carotid arteries to induce vascular injury and intimal thickening. Collar placement caused rapid upregulation of P2Y2 receptor mRNA in medial SMCs before appearance of neointima. Fura-2 digital imaging of single SMCs was used to measure changes in myoplasmic calcium concentration (Ca(m)) in response to P2Y receptor agonists. In contrast to UDP, activation by UTP or adenosine 5'-triphosphate (ATP) greatly increased Ca(m), which indicates upregulation of functional P2Y2 receptors at which UTP and ATP are equipotent agonists. The number of responsive cells was significantly greater for freshly dispersed SMCs from collared arteries than for controls. Perivascular infusion of UTP (100 micromol/L) within the collar significantly enhanced neointimal development. Intimas that resulted from UTP exposure were infiltrated by macrophages. Moreover, increased expression of osteopontin occurred in response to in situ application of UTP. ATP or UTP also stimulated osteopontin expression in cultured SMCs in a dose-dependent manner. Furthermore, P2Y2 antisense oligonucleotide inhibited osteopontin expression induced by UTP. CONCLUSIONS These findings indicate for the first time a role for the UTP/ATP receptor, P2Y2, in development of intimal hyperplasia associated with atherosclerosis and restenosis.
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MESH Headings
- Adenosine Triphosphate/pharmacology
- Animals
- Calcium/metabolism
- Carotid Arteries/drug effects
- Carotid Arteries/metabolism
- Carotid Arteries/pathology
- Carotid Stenosis/chemically induced
- Carotid Stenosis/metabolism
- Carotid Stenosis/pathology
- Cell Division/drug effects
- Cells, Cultured
- Disease Models, Animal
- Drug Administration Routes
- Fluorescent Dyes
- Hyperplasia/chemically induced
- Hyperplasia/metabolism
- Hyperplasia/pathology
- Immunoblotting
- Inflammation/chemically induced
- Inflammation/pathology
- Macrophages/pathology
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Osteopontin
- RNA/metabolism
- Rabbits
- Receptors, Purinergic P2/genetics
- Receptors, Purinergic P2/metabolism
- Receptors, Purinergic P2Y2
- Sialoglycoproteins/biosynthesis
- Tunica Intima/drug effects
- Tunica Intima/metabolism
- Tunica Intima/pathology
- Up-Regulation
- Uridine Triphosphate
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Affiliation(s)
- Cheikh I Seye
- Department of Biochemistry, University of Missouri-Columbia, Columbia, Mo 65212, USA.
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18
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Liu X, Mörk AC, Sun X, Castro R, Martinez JR, Zhang GH. Regulation of Ca(2+) signals in a parotid cell line Par-C5. Arch Oral Biol 2001; 46:1141-9. [PMID: 11684033 DOI: 10.1016/s0003-9969(01)00074-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Ca(2+) signaling system in an established immortalized rat parotid acinar cell line, Par-C5, was examined using the Ca(2+)-sensitive fluorescent indicator fura-2 and by measuring inositol 1,4,5-trisphosphate (IP(3)) formation. Agonist-induced increase in intracellular Ca(2+) ([Ca(2+)](i)) by mobilization of intracellular stores and influx across the cell membrane was stimulated by acetylcholine (ACh) and ATP, whereas noradrenaline-(NA)-induced a small [Ca(2+)](i) increase mediated primarily by release from intracellular Ca(2+) stores. [Ca(2+)](i) increase by ACh and ATP was mediated through the phosphoinositide signal pathway since both agonists significantly increased 1,4,5-IP(3) formation and Ca(2+) mobilization was abolished by the phospholipase C inhibitor U73122. In Ca(2+)-free medium, ACh or ATP discharged the IP(3)-sensitive Ca(2+) store and essentially abolished subsequent [Ca(2+)](i) response to thapsigargin (TG). Exposure to ionomycin and monensin after TG induced a further mobilization of Ca(2+), suggesting IP(3)-insensitive stores are present. Furthermore, depletion of IP(3)-sensitive Ca(2+) stores by TG, ACh and ATP enhanced plasmalemmal Ca(2+)-entry pathways. Exposure to tumor necrosis factor-alpha (TNF-alpha), a cytokine associated with lymphocyte invasion of salivary epithelial cells in autoimmune disorders, significantly reduced ACh-stimulated Ca(2+) mobilization. TNF-alpha inhibitory effect on Ca(2+) mobilization was not directly due to an interaction on muscarinic receptors since ACh-induced 1,4,5-IP(3) formation was not altered. These results in the Par-C5 cell line indicate 1) [Ca(2+)](i) is regulated by muscarinic and P2Y-nucleotide receptors and partly by alpha(1)-adrenergic receptors; 2) IP(3)-sensitive and -insensitive Ca(2+) stores exist; 3) Ca(2+) influx activated by ACh, ATP or TG is mediated by the store-operated Ca(2+) entry pathway; and 4) muscarinic agonist-stimulated Ca(2+) mobilization is altered by the cytokine TNF-alpha.
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Affiliation(s)
- X Liu
- Secretory Cell Physiology Laboratory, Department of Pediatrics, University of Texas Health Center, Mail Code 7827, 7703 Floyd Curl Dr., San Antonio, TX 78229-3900, USA
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19
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Weisman G, Griffin K, Santiago-Pérez L, Liu J, Krugh B, Flores R, Chorna N, Santos-Berríos C, Vivas-Mejía P, Garrad R, González F, Erb L. P2Y2receptors regulate multiple signal transduction pathways in monocytic cells. Drug Dev Res 2001. [DOI: 10.1002/ddr.1187] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Erb L, Liu J, Ockerhausen J, Kong Q, Garrad RC, Griffin K, Neal C, Krugh B, Santiago-Pérez LI, González FA, Gresham HD, Turner JT, Weisman GA. An RGD sequence in the P2Y(2) receptor interacts with alpha(V)beta(3) integrins and is required for G(o)-mediated signal transduction. J Cell Biol 2001; 153:491-501. [PMID: 11331301 PMCID: PMC2190579 DOI: 10.1083/jcb.153.3.491] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The P2Y(2) nucleotide receptor (P2Y(2)R) contains the integrin-binding domain arginine-glycine-aspartic acid (RGD) in its first extracellular loop, raising the possibility that this G protein-coupled receptor interacts directly with an integrin. Binding of a peptide corresponding to the first extracellular loop of the P2Y(2)R to K562 erythroleukemia cells was inhibited by antibodies against alpha(V)beta(3)/beta(5) integrins and the integrin-associated thrombospondin receptor, CD47. Immunofluorescence of cells transfected with epitope-tagged P2Y(2)Rs indicated that alpha(V) integrins colocalized 10-fold better with the wild-type P2Y(2)R than with a mutant P2Y(2)R in which the RGD sequence was replaced with RGE. Compared with the wild-type P2Y(2)R, the RGE mutant required 1,000-fold higher agonist concentrations to phosphorylate focal adhesion kinase, activate extracellular signal-regulated kinases, and initiate the PLC-dependent mobilization of intracellular Ca(2+). Furthermore, an anti-alpha(V) integrin antibody partially inhibited these signaling events mediated by the wild-type P2Y(2)R. Pertussis toxin, an inhibitor of G(i/o) proteins, partially inhibited Ca(2+) mobilization mediated by the wild-type P2Y(2)R, but not by the RGE mutant, suggesting that the RGD sequence is required for P2Y(2)R-mediated activation of G(o), but not G(q). Since CD47 has been shown to associate directly with G(i/o) family proteins, these results suggest that interactions between P2Y(2)Rs, integrins, and CD47 may be important for coupling the P2Y(2)R to G(o).
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MESH Headings
- Amino Acid Sequence
- Antigens, CD/metabolism
- CD47 Antigen
- Calcium/metabolism
- Carrier Proteins/metabolism
- Focal Adhesion Kinase 1
- Focal Adhesion Protein-Tyrosine Kinases
- GTP-Binding Protein alpha Subunits, Gi-Go
- Heterotrimeric GTP-Binding Proteins/metabolism
- Humans
- Integrins/metabolism
- Mitogen-Activated Protein Kinases/metabolism
- Molecular Sequence Data
- Oligopeptides/metabolism
- Phosphorylation
- Point Mutation
- Protein Binding
- Protein-Tyrosine Kinases
- Receptors, Purinergic P2/isolation & purification
- Receptors, Purinergic P2/metabolism
- Receptors, Purinergic P2Y1
- Receptors, Purinergic P2Y2
- Receptors, Vitronectin/genetics
- Receptors, Vitronectin/isolation & purification
- Receptors, Vitronectin/metabolism
- Sequence Homology, Amino Acid
- Signal Transduction
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Affiliation(s)
- L Erb
- Department of Biochemistry, University of Missouri-Columbia, Columbia, Missouri 65212, USA.
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