title: Defining blood processing parameters for optimal detection of cryopreserved antigen-specific responses for HIV vaccine trials.
abstract: Interferon-gamma (IFN-gamma) ELISpot and intracellular cytokine staining (ICS) assays are routinely employed in clinical HIV vaccine trials to identify antigen-specific T cells in cryopreserved peripheral blood mononuclear cells (PBMC). Several parameters involved in blood collection, processing and shipping may influence immunological function of the resulting cells, including anticoagulant type, time from venipuncture to PBMC isolation/cryopreservation, method of PBMC isolation and procedure for sample shipping. We examined these parameters in single and multiple site studies, and found the length of time from venipuncture to cryopreservation is the most important parameter affecting performance of T cells in immunological assays. Comparing blood processed at 24 h after venipuncture with that processed within 8 h, we observed on average a modest reduction in PBMC viability ( approximately 8% decrease), a greater loss in cell recovery ( approximately 32%), and between 36-56% loss in IFN-gamma T cell frequencies by ELISpot assay. We also describe three cold shipping methods that maintain immunological function in appropriately cryopreserved PBMC. These data indicate that cryopreservation of PBMC should occur within 8 h of venipuncture for optimal performance. This narrow window for specimen processing has important implications in selecting and monitoring clinical sites with laboratory capacity to perform these procedures in future clinical trials.
authors: Children's Hospital and Regional Medical Center, Seattle, WA, USA.
authors: Marta
authors: M
authors: Bull
authors: Deborah
authors: D
authors: Lee
authors: Jason
authors: J
authors: Stucky
authors: Ya-Lin
authors: YL
authors: Chiu
authors: Abbe
authors: A
authors: Rubin
authors: Helen
authors: H
authors: Horton
authors: M Juliana
authors: MJ
authors: McElrath
mesh_terms: D016915:AIDS Vaccines / Q000276:immunology*; D001769:Blood / Q000276:immunology / Q000821:virology*; D002986:Clinical Trials as Topic / Q000592:standards*; D015925:Cryopreservation / Q000592:standards*; D016207:Cytokines / Q000032:analysis; D005260:Female; D005615:Freezing; D015488:HIV Antigens / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000032:analysis; D007963:Leukocytes, Mononuclear / Q000276:immunology; D008297:Male; D013048:Specimen Handling / Q000592:standards*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D016915:AIDS Vaccines; D016207:Cytokines; D015488:HIV Antigens; D007371:Interferon-gamma