Linked Life Data

19272393

Source:http://linkedlifedata.com/resource/pubmed/id/19272393

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pubmed-article:19272393pubmed:abstractTextDirect regulation of T cell function by microbial ligands through Toll-like receptors (TLR) is an emerging area of T cell biology. Currently either immunomagnetic cell sorting (IMACS) or fluorescence-activated cell sorting (FACS), are utilized to isolate T-cell subsets for such studies. However, it is unknown to what extent differences in T cell purity between these isolation techniques influence T cell functional assays. We compared the purity, response to mitogen, activation requirements, and response to TLR ligands between human CD4(+) T cells isolated either by IMACS (IMACS-CD4(+)) or by IMACS followed by FACS (IMACS/FACS-CD4(+)). As expected, IMACS-CD4(+) were less pure than IMACS/FACS-CD4(+) (92.5%+/-1.4% versus 99.7%+/-0.2%, respectively). Consequently, IMACS-CD4(+) proliferated and produced cytokines in response to mitogen alone and had lower activation requirements compared to IMACS/FACS-CD4(+). In addition IMACS-CD4(+) but not IMACS/FACS-CD4(+) responses were upregulated by the TLR-4 ligand lipopolysaccharide (LPS). On the other hand, TLR-2 and TLR-5 engagement induced costimulation in both IMACS-CD4(+) and highly purified IMACS-/FACS-CD4(+). Altogether these results indicate that small differences in cell purity can significantly alter T cell responses to TLR ligands. This study stresses the importance of a stringent purification method when investigating the role of microbial ligands in T cell function.lld:pubmed
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pubmed-article:19272393pubmed:dateRevised2011-5-19lld:pubmed
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pubmed-article:19272393pubmed:articleTitleActivation requirements and responses to TLR ligands in human CD4+ T cells: comparison of two T cell isolation techniques.lld:pubmed
pubmed-article:19272393pubmed:affiliationDepartment of Pediatrics, Division of Pediatric Infectious Diseases, Case Western Reserve University & University Hospitals, Cleveland, Ohio 44106, USA. Christina.Lancioni@uhhospitals.orglld:pubmed
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