Corneal Epithelium Expresses a Variant of P2X7 Receptor in Health and Disease
Improper wound repair of the corneal epithelium can alter refraction of light resulting in impaired vision. We have shown that ATP is released after injury, activates purinergic receptor signaling pathways and plays a major role in wound closure. In many cells or tissues, ATP activates P2X7 receptor...
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| description | Improper wound repair of the corneal epithelium can alter refraction of light resulting in impaired vision. We have shown that ATP is released after injury, activates purinergic receptor signaling pathways and plays a major role in wound closure. In many cells or tissues, ATP activates P2X7 receptors leading to cation fluxes and cytotoxicity. The corneal epithelium is an excellent model to study the expression of both the full-length P2X7 form (defined as the canonical receptor) and its truncated forms. When Ca2+ mobilization is induced by BzATP, a P2X7 agonist, it is attenuated in the presence of extracellular Mg2+ or Zn2+, negligible in the absence of extracellular Ca2+, and inhibited by the competitive P2X7 receptor inhibitor, A438079. BzATP enhanced phosphorylation of ERK. Together these responses indicate the presence of a canonical or full-length P2X7 receptor. In addition BzATP enhanced epithelial cell migration, and transfection with siRNA to the P2X7 receptor reduced cell migration. Furthermore, sustained activation did not induce dye uptake indicating the presence of truncated or variant forms that lack the ability to form large pores. Reverse transcription-polymerase chain reaction and Northern blot analysis revealed a P2X7 splice variant. Western blots identified a full-length and truncated form, and the expression pattern changed as cultures progressed from monolayer to stratified. Cross-linking gels demonstrated the presence of homo- and heterotrimers. We examined epithelium from age matched diabetic and non-diabetic corneas patients and detected a 4-fold increase in P2X7 mRNA from diabetic corneal epithelium compared to non-diabetic controls and an increased trend in expression of P2X7variant mRNA. Taken together, these data indicate that corneal epithelial cells express full-length and truncated forms of P2X7, which ultimately allows P2X7 to function as a multifaceted receptor that can mediate cell proliferation and migration or cell death. |
| doi_str_mv | 10.1371/journal.pone.0028541 |
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We have shown that ATP is released after injury, activates purinergic receptor signaling pathways and plays a major role in wound closure. In many cells or tissues, ATP activates P2X7 receptors leading to cation fluxes and cytotoxicity. The corneal epithelium is an excellent model to study the expression of both the full-length P2X7 form (defined as the canonical receptor) and its truncated forms. When Ca2+ mobilization is induced by BzATP, a P2X7 agonist, it is attenuated in the presence of extracellular Mg2+ or Zn2+, negligible in the absence of extracellular Ca2+, and inhibited by the competitive P2X7 receptor inhibitor, A438079. BzATP enhanced phosphorylation of ERK. Together these responses indicate the presence of a canonical or full-length P2X7 receptor. In addition BzATP enhanced epithelial cell migration, and transfection with siRNA to the P2X7 receptor reduced cell migration. Furthermore, sustained activation did not induce dye uptake indicating the presence of truncated or variant forms that lack the ability to form large pores. Reverse transcription-polymerase chain reaction and Northern blot analysis revealed a P2X7 splice variant. Western blots identified a full-length and truncated form, and the expression pattern changed as cultures progressed from monolayer to stratified. Cross-linking gels demonstrated the presence of homo- and heterotrimers. We examined epithelium from age matched diabetic and non-diabetic corneas patients and detected a 4-fold increase in P2X7 mRNA from diabetic corneal epithelium compared to non-diabetic controls and an increased trend in expression of P2X7variant mRNA. Taken together, these data indicate that corneal epithelial cells express full-length and truncated forms of P2X7, which ultimately allows P2X7 to function as a multifaceted receptor that can mediate cell proliferation and migration or cell death.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0028541</identifier><identifier>PMID: 22163032</identifier><language>eng</language><publisher>San Francisco: Public Library of Science</publisher><subject>Alternative splicing ; Apoptosis ; ATP ; Biochemistry ; Biology ; Calcium (extracellular) ; Cell activation ; Cell death ; Cell migration ; Cell proliferation ; Cornea ; Crosslinking ; Cytotoxicity ; Diabetes ; Diabetes mellitus ; Disease ; Epithelial cells ; Epithelium ; Fluxes ; Gels ; Gene expression ; Kinases ; Lymphocytes ; Magnesium ; Medicine ; Phosphorylation ; Polymerase chain reaction ; Proteins ; Receptors ; Refraction ; Reverse transcription ; Rodents ; Signaling ; siRNA ; Tissues ; Toxicity ; Transfection ; Western blotting ; Wound healing ; Zinc</subject><ispartof>PloS one, 2011-12, Vol.6 (12), p.e28541</ispartof><rights>2011 Mankus et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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We have shown that ATP is released after injury, activates purinergic receptor signaling pathways and plays a major role in wound closure. In many cells or tissues, ATP activates P2X7 receptors leading to cation fluxes and cytotoxicity. The corneal epithelium is an excellent model to study the expression of both the full-length P2X7 form (defined as the canonical receptor) and its truncated forms. When Ca2+ mobilization is induced by BzATP, a P2X7 agonist, it is attenuated in the presence of extracellular Mg2+ or Zn2+, negligible in the absence of extracellular Ca2+, and inhibited by the competitive P2X7 receptor inhibitor, A438079. BzATP enhanced phosphorylation of ERK. Together these responses indicate the presence of a canonical or full-length P2X7 receptor. In addition BzATP enhanced epithelial cell migration, and transfection with siRNA to the P2X7 receptor reduced cell migration. Furthermore, sustained activation did not induce dye uptake indicating the presence of truncated or variant forms that lack the ability to form large pores. Reverse transcription-polymerase chain reaction and Northern blot analysis revealed a P2X7 splice variant. Western blots identified a full-length and truncated form, and the expression pattern changed as cultures progressed from monolayer to stratified. Cross-linking gels demonstrated the presence of homo- and heterotrimers. We examined epithelium from age matched diabetic and non-diabetic corneas patients and detected a 4-fold increase in P2X7 mRNA from diabetic corneal epithelium compared to non-diabetic controls and an increased trend in expression of P2X7variant mRNA. Taken together, these data indicate that corneal epithelial cells express full-length and truncated forms of P2X7, which ultimately allows P2X7 to function as a multifaceted receptor that can mediate cell proliferation and migration or cell death.</description><subject>Alternative splicing</subject><subject>Apoptosis</subject><subject>ATP</subject><subject>Biochemistry</subject><subject>Biology</subject><subject>Calcium (extracellular)</subject><subject>Cell activation</subject><subject>Cell death</subject><subject>Cell migration</subject><subject>Cell proliferation</subject><subject>Cornea</subject><subject>Crosslinking</subject><subject>Cytotoxicity</subject><subject>Diabetes</subject><subject>Diabetes mellitus</subject><subject>Disease</subject><subject>Epithelial cells</subject><subject>Epithelium</subject><subject>Fluxes</subject><subject>Gels</subject><subject>Gene 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Participant titles)</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mankus, Courtney</au><au>Rich, Celeste</au><au>Minns, Martin</au><au>Trinkaus-Randall, Vickery</au><au>Connon, Che John</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Corneal Epithelium Expresses a Variant of P2X7 Receptor in Health and Disease</atitle><jtitle>PloS one</jtitle><date>2011-12-06</date><risdate>2011</risdate><volume>6</volume><issue>12</issue><spage>e28541</spage><pages>e28541-</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Improper wound repair of the corneal epithelium can alter refraction of light resulting in impaired vision. We have shown that ATP is released after injury, activates purinergic receptor signaling pathways and plays a major role in wound closure. In many cells or tissues, ATP activates P2X7 receptors leading to cation fluxes and cytotoxicity. The corneal epithelium is an excellent model to study the expression of both the full-length P2X7 form (defined as the canonical receptor) and its truncated forms. When Ca2+ mobilization is induced by BzATP, a P2X7 agonist, it is attenuated in the presence of extracellular Mg2+ or Zn2+, negligible in the absence of extracellular Ca2+, and inhibited by the competitive P2X7 receptor inhibitor, A438079. BzATP enhanced phosphorylation of ERK. Together these responses indicate the presence of a canonical or full-length P2X7 receptor. In addition BzATP enhanced epithelial cell migration, and transfection with siRNA to the P2X7 receptor reduced cell migration. Furthermore, sustained activation did not induce dye uptake indicating the presence of truncated or variant forms that lack the ability to form large pores. Reverse transcription-polymerase chain reaction and Northern blot analysis revealed a P2X7 splice variant. Western blots identified a full-length and truncated form, and the expression pattern changed as cultures progressed from monolayer to stratified. Cross-linking gels demonstrated the presence of homo- and heterotrimers. We examined epithelium from age matched diabetic and non-diabetic corneas patients and detected a 4-fold increase in P2X7 mRNA from diabetic corneal epithelium compared to non-diabetic controls and an increased trend in expression of P2X7variant mRNA. Taken together, these data indicate that corneal epithelial cells express full-length and truncated forms of P2X7, which ultimately allows P2X7 to function as a multifaceted receptor that can mediate cell proliferation and migration or cell death.</abstract><cop>San Francisco</cop><pub>Public Library of Science</pub><pmid>22163032</pmid><doi>10.1371/journal.pone.0028541</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Alternative splicing Apoptosis ATP Biochemistry Biology Calcium (extracellular) Cell activation Cell death Cell migration Cell proliferation Cornea Crosslinking Cytotoxicity Diabetes Diabetes mellitus Disease Epithelial cells Epithelium Fluxes Gels Gene expression Kinases Lymphocytes Magnesium Medicine Phosphorylation Polymerase chain reaction Proteins Receptors Refraction Reverse transcription Rodents Signaling siRNA Tissues Toxicity Transfection Western blotting Wound healing Zinc |
| title | Corneal Epithelium Expresses a Variant of P2X7 Receptor in Health and Disease |
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