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Document 0922
DOCN M9650922
TI In vitro response of lymphocytes from bronchoalveolar lavage fluid and
peripheral blood to mitogen stimulation during natural maedi-visna virus
infection.
DT 9505
AU Begara I; Lujan L; Collie DS; Miller HR; Watt NJ; Department of
Veterinary Clinical Studies, Royal (Dick) School of; Veterinary Studies,
University of Edinburgh, Easter Bush,; Midlothian, UK.
SO Vet Immunol Immunopathol. 1995 Nov;49(1-2):75-88. Unique Identifier :
AIDSLINE MED/96158378
AB To investigate the effects of maedi-visna virus (MVV) infection on
cell-mediated immunity, the in vitro response of bronchoalveolar lavage
fluid (BALF) and peripheral blood (BP) lymphocytes (PBL) to exogenous
mitogen was analysed. BALF and PBL from control (n = 9) and MVV-infected
(n = 7) animals were cultured fro 3 days in the presence and absence of
concanavalin A (Con A). Lymphocyte expression of the interleukin-2
receptor (IL-2R) antigen, a parameter of lymphocyte activation, was
quantified by dual-colour flow cytometry using the bovine anti-IL-2R
monoclonal antibody IL-A111. IL-2R expression by lymphocytes in BALF and
PB from control and MVV-infected animals, with and without Con A
stimulation, were compared. In the absence of Con A stimulation, the
proportion of cultured BALF CD8+ and gamma delta T cells expressing
IL-2R was significantly (P < 0.05) lower for MVV-infected animals than
for controls. After Con A stimulation the proportion of BALF CD4+
lymphocytes from MVV-infected animals that expressed IL-2R remained
significantly (P < 0.05) lower than for controls. Comparisons within
group showed that, after Con A stimulation, the proportion of all the T
cell subsets in the control group expressing IL-2R, namely CD4+ (P <
0.001), CD8+ (P < 0.001) and gamma delta T cells (P < 0.05), was
significantly increased. In the MVV-infected group, this increase was
significant (P < 0.05) for CD4+ and CD8+ T cells, but not for gamma
delta T cells. In vitro mitogen stimulation of PB T lymphocytes from
both control and MVV-infected animals induced a significant elevation in
the proportion of all T cell subsets expressing IL-2R when compared to
cultured unstimulated control cells. However, there was considerable
heterogeneity in the response to Con A of PB T cells from both groups of
animals. The expression of IL-2R followed a different pattern to that of
BALF lymphocytes, the proportion of unstimulated gamma delta / IL-2R+ T
cells from MVV-infected animals being significantly (P < 0.05) higher
than that of controls, and the proportion of cultured unstimulated CD8+
/ IL-2R+ T cells from MVV-infected animals being significantly (P <
0.05) lower than that from controls. From these studies it can be
concluded that the BALF T lymphocyte immune dysfunction observed during
natural MVV infection, characterized by impaired IL-2R expression, is
maintained under in vitro conditions.
DE Animal Bronchoalveolar Lavage Fluid/CYTOLOGY/*IMMUNOLOGY Cattle
Concanavalin A/PHARMACOLOGY CD4-Positive T-Lymphocytes/IMMUNOLOGY
CD8-Positive T-Lymphocytes/IMMUNOLOGY Female In Vitro *Lymphocyte
Transformation Lymphocytes/*IMMUNOLOGY Macrophages,
Alveolar/IMMUNOLOGY Pneumonia, Progressive Interstitial, of
Sheep/*IMMUNOLOGY Receptors, Antigen, T-Cell, gamma-delta/METABOLISM
Receptors, Interleukin-2/METABOLISM Sheep Support, Non-U.S. Gov't
T-Lymphocyte Subsets/IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).