Hemopexins Suppress Phorbol Ester-induced Necrosis of Polymorphonuclear Leucocytes

Cell Structure and Function

Hideo Namiki¹  Kingo Suzuki¹  Yasuyuki Sakuma¹  Hidenobu Kato¹ 

[1] Department of Biology, School of Education, Waseda University

关键词: hemopexin;    phorbol 12-myristate 13-acetate;    necrosis;    polymorphonuclear leucocytes;   

DOI  :  10.1247/csf.26.235

学科分类：分子生物学，细胞生物学和基因

来源: Japan Society for Cell Biology

【 摘 要 】

References(25)Cited-By(10)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.

【 授权许可】

Unknown