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Hemopexins Suppress Phorbol Ester-induced Necrosis of Polymorphonuclear Leucocytes.

  • Suzuki Kingo
    Department of Biology, School of Education, Waseda University
  • Kato Hidenobu
    Department of Biology, School of Education, Waseda University
  • Sakuma Yasuyuki
    Department of Biology, School of Education, Waseda University
  • Namiki Hideo
    Department of Biology, School of Education, Waseda University

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Abstract

It was recently reported that intravenous administration of phorbol 12-myristate 13-acetate (PMA) showed a therapeutic effect in myelocytic leukemia patients. However, we previously observed that, in serum-free conditions, polymorphonuclear leucocytes (PMNs) were killed rapidly by exposure to PMA, suggesting the possibility of serious side effects. In this study, we found that PMA-induced necrosis of PMNs was prevented by serum, suggesting the existence of a "necrosis-suppressing factor". Next we tried to identify the serum factor. The hemopexins we purified were found to suppress necrosis of PMNs in a dose-dependent fashion. Hemopexins alone could not suppress necrosis, however, as it required the coexistence of another macromolecule such as albumin. Albumin promoted the suppressive activity of hemopexins in a dose-dependent fashion. These results strongly suggest that serum hemopexins may rescue mature PMNs from necrosis in the PMA-administered leukemia patient as previously reported, resulting in avoidance of serious side effects.

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