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Consequences of increased CD45RA and RC isoforms for TCR signaling and peripheral T cell deficiency resulting from heterogeneous nuclear ribonucleoprotein L-like mutation

Wu, Zuopeng; Yates (previously Loy), Adele; Hoyne, Gerard; Goodnow, Christopher

Description

CD45 is the most abundant protein tyrosine phosphatase in the plasma membrane of T cells and serves a critical role in TCR signaling. Different CD45 isoforms are made by alternative mRNA splicing depending on the stage of T cell development and activation, yet their role remains unclear. Expression of CD45RA and RC isoforms is increased 20- to 200-fold on T cells from thunder mice with a loss-of-function mutation in the RNA-binding protein, heterogeneous nuclear ribonucleoprotein L-like...[Show more]

dc.contributor.authorWu, Zuopeng
dc.contributor.authorYates (previously Loy), Adele
dc.contributor.authorHoyne, Gerard
dc.contributor.authorGoodnow, Christopher
dc.date.accessioned2015-12-10T22:16:53Z
dc.identifier.issn0022-1767
dc.identifier.urihttp://hdl.handle.net/1885/51152
dc.description.abstractCD45 is the most abundant protein tyrosine phosphatase in the plasma membrane of T cells and serves a critical role in TCR signaling. Different CD45 isoforms are made by alternative mRNA splicing depending on the stage of T cell development and activation, yet their role remains unclear. Expression of CD45RA and RC isoforms is increased 20- to 200-fold on T cells from thunder mice with a loss-of-function mutation in the RNA-binding protein, heterogeneous nuclear ribonucleoprotein L-like (hnRNPLL), although total CD45 expression is unaltered. In this study, we test the hypothesis that this shift in CD45 isoform expression alters TCR signaling, thymic selection, and accumulation of peripheral T cells. There was no discernable effect of the change in CD45 isoform expression upon Lck phosphorylation or T cell positive and negative selection, whereas these indices were strongly affected by a decrease in the overall amount of CD45 in Ptprc mutant animals. The one exception to this conclusion was in thymocytes from Ptprcloc/loc animals with 4% of normal CD45 protein levels, where Lck505 phosphorylation was increased 25% in Hnrpll mutant cells, suggesting that high m.w. CD45 isoforms had lower Lck505 phosphatase activity in this context. In T cells with no CD45 protein, hnRNPLL mutation still diminished peripheral T cell accumulation, demonstrating that hnRNPLL regulates T cell longevity independently from its effects on CD45 splicing.
dc.publisherAmerican Association of Immunologists
dc.sourceJournal of Immunology
dc.subjectKeywords: CD45RA antigen; heterogeneous nuclear ribonucleoprotein L; heterogeneous nuclear ribonucleoprotein L like; isoprotein; messenger RNA; protein kinase Lck; protein tyrosine phosphatase; RNA binding protein; T lymphocyte receptor; unclassified drug; CD45 ant
dc.titleConsequences of increased CD45RA and RC isoforms for TCR signaling and peripheral T cell deficiency resulting from heterogeneous nuclear ribonucleoprotein L-like mutation
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume185
dc.date.issued2010
local.identifier.absfor110799 - Immunology not elsewhere classified
local.identifier.ariespublicationf2965xPUB218
local.type.statusPublished Version
local.contributor.affiliationWu, Zuopeng, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationYates (previously Loy), Adele, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationHoyne, Gerard, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationGoodnow, Christopher, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage231
local.bibliographicCitation.lastpage238
local.identifier.doi10.4049/jimmunol.0903625
dc.date.updated2016-02-24T08:22:53Z
local.identifier.scopusID2-s2.0-77956214250
local.identifier.thomsonID000278933800027
CollectionsANU Research Publications

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