Details

Autor(en) / Beteiligte

• Stasny, B R
• De Guise, S
• Rompato, G
• Garmendia, A E

Titel

Functional characterization of a swine CD4 super(+)/CD8 super(+) double positive lymphoblastoid T-cell line with a CD25 super(+)/CD45RA super(-) phenotype generated in vitro with interleukin-2

Ist Teil von

• Veterinary immunology and immunopathology, 2001-01, Vol.78 (1), p.57-70

Erscheinungsjahr

2001

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• A dual expressing (CD4 super(+)/CD8 super(+)) porcine lymphoblastoid T-cell line (pIL-2d) generated from peripheral blood mononuclear (MN) cells shown to be highly responsive to exogenous interleukin-2 (IL-2) was characterized. The swine MN cells were initially stimulated with concanavalin A (Con A), and sub-passaged using decreasing amounts of conditioned medium (CM), which was prepared from culture fluids of Con A activated porcine MN cells, until a steady growth was observed. The resulting pIL-2d cells require exogenous IL-2 from CM and are highly responsive to recombinant human IL-2 (rhIL-2). The pIL-2d cells exhibited a specific, dose-dependent proliferative response to stimulation with IL-2. The specificity of this proliferative response was confirmed to be IL-2 induced by its inhibition with an anti-swine IL-2 receptor ( alpha -swIL-2R) monoclonal antibody (mAb). Furthermore, the pIL-2d cells are highly responsive to exogenous IL-2 contained in culture fluids derived from antigen-driven blastogenic tests performed with lymphocytes of vaccinated swine. This property makes the pIL-2d cells an ideal functional adjunct to immunochemical or molecular tests that are commonly used to measure total porcine IL-2. Interestingly, the phenotype of the pIL-2d cells after five or more passages was shown by flow cytometric analysis to be CD4 super(+) /CD8 super(+)/CD45RA super(-)/CD25 super(+) and to remain unchanged thereafter. Although, the mechanism of selection and maintenance of the CD4 super(+)/CD8 super(+) DP cells developed here remains unclear, our data suggest that an oligoclonal or polyclonal expansion and maintenance of cells of this phenotype was mediated by exogenous IL-2.