Summary
Lysozyme at 1 to 100µg/ml of exposure levels augmented or inhibited proliferative response of human peripheral blood lymphocytes stimulated with interleukin-2 (IL-2). This contradictory effect of lysozyme depended on IL-2 concentration, activating state of lymphocytes, addition time of lysozyme, and serum existence. Lymphocytes increased their IL-2-mediated proliferating ability in response to lysozyme when stimulated with less than suboptimal concentration of IL-2. Lymphocyte activation with anti-CD3 antibody changed the augmented proliferative response into the inhibited response by lysozyme addition whereas elimination of MHC class II molecule-expressing cells augmented the response. Addition of lysozyme within 1 h after IL-2 exposure was most effective in promoting the proliferation whereas additions after 16 to 24 h were ineffective or inhibitory. Addition after longer than 24 h inversely restored the proliferative response. Serum seemed to retard lysozyme action because either sequential serum addition 1 h after exposure of IL-2 and lysozyme to cells or exposure of IL-2 and serum after pretreatment of cells with lysozyme changed the proliferative responsiveness from inhibition into augmentation. Thus lysozyme may regulate lymphocyte proliferation responding to a magnitude of antigenic stimuli and to the progression of cellular events that periodically occur.
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Yabe, N., Komiya, K., Takezono, T. et al. Lysozyme as a regulator of interleukin-2-activated lymphocyte proliferation. In Vitro Cell Dev Biol - Animal 29, 795–806 (1993). https://doi.org/10.1007/BF02634347
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DOI: https://doi.org/10.1007/BF02634347