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The population of T-cell subsets, the blastogenic responses of lymphocytes in blood and spleen and splenic NK cell activity were examined in mice transferred from 22 degrees C to 12 degrees C or 32 degrees C environments. The percentage of Thy-1.2 positive cells and Lyt-1.2 positive cells in the spleen decreased after the transfer. However the percentage of Lyt-2.2 positive cells in the spleen was not affected. Thy-1.2 and Lyt-1.2 positive cells in the blood also decreased. The percentage of Lyt-2.2 positive cells in the blood was not affected in mice exposed to 12 degrees C. However, Lyt-2.2 positive cells in the blood decreased on day 1 but increased on day 3 in mice exposed to 32 degrees C. Blastogenic responses of spleen lymphocytes to concanavalin A (Con A) and pokeweed mitogen (PWM) were suppressed in transferred mice, but responses to lipopolysaccharide (LPS) and phytohemagglutinin-P (PHA-P) were not affected in any group. Blastogenic responses of blood lymphocytes to Con A, PHA-P, and PWM tended to be weaker in transferred mice than in mice kept in the 22 degrees C environment. In particular the response to PWM in mice exposed to 12 degrees C was less than 8% of that in the 22 degrees C mice. Splenic NK cell activity decreased in transferred mice, but was not suppressed as much as in mice administered 5mg of cortisone acetate.(ABSTRACT TRUNCATED AT 250 WORDS)

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Effects of Environmental Temperature on the Population of T-cell Subsets, the Blastogenic Responses of Lymphocytes in Blood and Spleen and Splenic NK cell Activity in Mice