Differential expression of granzyme A and granzyme B proteases and their secretion by fresh rat natural killer cells (NK) and lymphokine-activated killer cells with NK phenotype (LAK-NK)

F. Velotti, G. Palmieri, D. D Ambrosio, M. Piccoli, L. Frati, A. Santoni

Research output: Contribution to journalArticle


Granzymes A-G are a family of serine proteases localized in the cytoplasmic granules of cytotoxic T lymphocytes (Masson, D. et al. Cell 1987, 49: 679) and granzyme A is secreted by T lymphocytes in response to antigenic stimulation. Granzyme A is also expressed by natural killer (NK) and lymphokine-activated killer (LAK) cells. Here we show that fresh rat NK cells constitutively express granzyme B and that granzyme A and granzymc B are differentially regulated in unstimulated NK cells vs. LAK cells with NK phenotype (LAK-NK cells). We also show that both granzymes A and B arc secreted in a calcium-dependent manner, by NK and LAK-NK cells in response to stimuli which trigger NK cell functions.

Original languageEnglish
Pages (from-to)1049-1053
Number of pages5
JournalEuropean Journal of Immunology
Issue number4
Publication statusPublished - 1992


ASJC Scopus subject areas

  • Immunology

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