The cytotoxic activity of L-asparaginases from Yersinia pseudotuberculosis and from Erwinia carotovora were investigated in vitro using several tumor cells lines: Jurkat and Molt-4 (human T-lymphoblastic leukemia), MCF-7 (human breast adenocarcinoma), LnCap (human prostate carcinoma), NGUK1 (rat Gasser node neurinoma). E. coli L-asparaginase produced by "Medak" (Germany) was used as a reference. The cell growth inhibition data indicate that Y. pseudotuberculosis L-asparaginase significantly inhibits growth of leukemic and solid tumor cells. These results allow us to conclude that this L-asparaginase can be used for the development of new preparations for the therapy of different types of tumors.
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