How and when to pick up the best signals from markers associated with T-regulatory cells?
2009 (English)In: JIM - Journal of Immunological Methods, ISSN 0022-1759, E-ISSN 1872-7905, Vol. 345, no 1-2, 29-39 p.Article in journal (Refereed) Published
Regulatory T (Treg) cells are important tools with the purpose to control and regulate the immune system. These cells use FOXP3, TGF-beta, CTLA-4 and sCTLA-4 to regulate other T-cells. Since cryopreservation of peripheral blood mononuclear cells (PBMC) is a convenient way to handle samples, we investigated whether these cells will change their mRNA expression of Treg associated markers, as well as secretion of TGF-beta1, after cryopreservation. Additionally, we aimed to investigate the mRNA expression after two different time intervals of in vitro antigen stimulation. PBMC from healthy adults were stimulated either fresh (48/96 h) or after cryopreservation (48 h), with PHA, tetanus toxoid, beta-lactoglobulin, ovalbumin or in culture medium exclusively (spontaneous). The mRNA expression of FOXP3, TGF-beta, CTLA-4 and sCTLA-4 were studied with multiplex real-time RT-PCR and TGF-beta1 with ELISA. Cryopreserved PBMC were appropriate for detection of the Treg associated markers FOXP3, TGF-beta, CTLA-4 and sCTLA-4 expressed spontaneously. Also antigen-induced mRNA expression of CTLA-4, sCTLA-4 and TGF-beta and secreted TGF-beta1, with the exception of FOXP3, preserved a stable transcription activity after cryopreservation. Further, a stimulation period of 48 h in general revealed the highest mRNA expression of the markers studied. In conclusion, cryopreserved cells are in general suitable for studying Treg associated markers.
Place, publisher, year, edition, pages
2009. Vol. 345, no 1-2, 29-39 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-18986DOI: 10.1016/j.jim.2009.03.010PubMedID: 19341742OAI: oai:DiVA.org:liu-18986DiVA: diva2:222198