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
Search this article
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.
Journal
-
- Cell Structure and Function
-
Cell Structure and Function 26 (4), 235-241, 2001
Japan Society for Cell Biology