title: Characterization of surface interleukin-2 receptor expression on gated populations of peripheral blood mononuclear cells from manatees, Trichechus manatus latirostris.
abstract: An in vitro system to determine surface interleukin-2 receptor (IL-2R) expression on mitogen-stimulated peripheral blood mononuclear cells (PBMC) from free-ranging manatees, Trichechus manatus latirostris was developed. Human recombinant IL-2, conjugated with a fluorescein dye was used in conjunction with flow cytometric analysis to determine changes in surface expression of IL-2R at sequential times over a 48-h period of in vitro stimulation. Surface expression of IL-2R was detected on manatee PBMC, which also cross-reacted with an anti-feline pan T-cell marker. An expression index (EI) was calculated by comparing mitogen-activated and non-activated PBMC. Based on side- and forward-scatter properties, flow cytometric analysis showed an increase in the number of larger, more granular "lymphoblasts" following concanavalin A (Con A) stimulation. The appearance of lymphoblasts was correlated with an increase in their surface expression of IL-2 receptors. Surface IL-2R expression, in Con A-stimulated PBMC, was detected at 16 h, peaked at 24-36 h, and began to decrease by 48 h. Characterization of the IL-2R expression should provide additional information on the health status of manatees, and the effect of their sub lethal exposure to brevetoxin.
authors.affiliation: University of Florida, College of Veterinary Medicine, Department of Pathobiology, P.O. Box 110880, Gainesville, FL 32611, USA. sweatm@mail.vetmed.ufl.edu
authors.forename: J M
authors.initials: JM
authors.lastname: Sweat
authors.forename: C M
authors.initials: CM
authors.lastname: Johnson
authors.forename: Y
authors.initials: Y
authors.lastname: Marikar
authors.forename: E P
authors.initials: EP
authors.lastname: Gibbs
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D005786:Gene Expression Regulation; D006801:Humans; D007376:Interleukin-2 / Q000378:metabolism; D007963:Leukocytes, Mononuclear / Q000378:metabolism*; D051379:Mice; D015375:Receptors, Interleukin-2 / Q000378:metabolism*; D020457:Trichechus manatus / Q000097:blood*
chemical_list: D000911:Antibodies, Monoclonal; D007376:Interleukin-2; D015375:Receptors, Interleukin-2