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Title: Transcription profiling of plasma cells and plasmablasts from patients with primary immune thrombocytopenia after rituximab treatment compared to treatment naïve patients or healthy donors      
dateReleased:
08-08-2013
description:
Splenic tissues from immune thrombocytopenia purpura (ITP) patients splenectomized after primary failure of treatment with the B-cell depleting agent rituximab were analyzed, and antibody-secreting cells were identified as the major B-cell population resisting the treatment. The phenotype, antibody specificity and gene expression profile of these cells were characterized and compared to antibody-secreting cells from untreated ITP spleens and from healthy tissues. Anti-platelet-specific plasma cells (PC) were detected in the spleen of ITP patients up to 6 months after rituximab treatment, and the PC population displayed a long-lived program similar to the one of bone marrow PC, thus explaining for most of these patients the absence of response to rituximab and the response to splenectomy. When analyzed by multiplex PCR at the singlecell level, normal splenic PC showed a markedly different gene expression profile, with an intermediate signature including genes characteristic of both long-lived PC and proliferating plasmablasts. Surprisingly, long-lived PC were not detected either in the inflammatory environment of the untreated ITP spleen. These results suggest that neither the normal nor the auto-immune splenic environment favors the differentiation and residence of long-lived PC, and that it is most probably the milieu generated by B-cell depletion that promotes their local settlement.
privacy:
not applicable
aggregation:
instance of dataset
ID:
E-MEXP-3711
refinement:
raw
keywords:
functional genomics
dateModified:
10-20-2015
creators:
Nicolas Cagnard
availability:
available
types:
gene expression
name:
Homo sapiens
ID:
A-AFFY-44
name:
Affymetrix GeneChip Human Genome U133 Plus 2.0 [HG-U133_Plus_2]
accessURL: https://www.ebi.ac.uk/arrayexpress/files/E-MEXP-3711/E-MEXP-3711.raw.1.zip
storedIn:
ArrayExpress
qualifier:
gzip compressed
format:
TXT
accessType:
download
authentication:
none
authorization:
none
accessURL: https://www.ebi.ac.uk/arrayexpress/files/E-MEXP-3711/E-MEXP-3711.processed.1.zip
storedIn:
ArrayExpress
qualifier:
gzip compressed
format:
TXT
accessType:
download
authentication:
none
authorization:
none
abbreviation:
EBI
homePage: http://www.ebi.ac.uk/
ID:
SCR:004727
name:
European Bioinformatics Institute
homePage: https://www.ebi.ac.uk/arrayexpress/
ID:
SCR:002964
name:
ArrayExpress