Abstract:
OBJECTIVE:The central mechanism for establishing a self-tolerant and functional T cell repertoire includes the promiscuous expression of otherwise tissue-restricted proteins by medullary thymic epithelial cells (TEC). We here demonstrate a novel and highly efficient method for isolating this rare key cell type. METHODS:We combined the enrichment of medullary TEC via UEA-1 MicroBeads with the subsequent depletion of residual CD45+ hematopoietic cells via specific size exclusion and compared our results to the standard Percoll enrichment method and isolation procedure via flow cytometric cell sorting. RESULTS:The addition of 2 μl UEA-1 MicroBeads per 108 thymus cells turned out best for optimal enrichment (an average of 22% purity compared to 1.2% for Percoll) and yield (an average of 1.73 × 105 medullary TEC per thymus compared to 5.16 × 104 for Percoll). After depletion of residual CD45+ cells, our method not only reached a purity of 75.5% but also turned out less stressful for the cells as compared to flow cytometric cell sorting. CONCLUSION:We here provide a fast and versatile procedure for enriching medullary TEC that yields higher purity and recovery rates than the standard Percoll enrichment method Our enrichment procedure in combination with CD45+ depletion via specific size exclusion is comparable to the current gold standard flow cytometric cell sorting method. SIGNIFICANCE STATEMENT:We developed a fast and versatile procedure to isolate a high number medullary TEC to investigate the biochemical processes of medullary TEC in more depths.
journal_name
J Immunol Methodsjournal_title
Journal of immunological methodsauthors
Dohr D,Engelmann R,Müller-Hilke Bdoi
10.1016/j.jim.2019.02.001subject
Has Abstractpub_date
2019-04-01 00:00:00pages
12-18eissn
0022-1759issn
1872-7905pii
S0022-1759(18)30281-3journal_volume
467pub_type
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