Activation of phospholipase A2by 1,25 (OH)2vitamin D3and cell growth in monocytic U937 and mono mac 6 cells
作者:
Franz C. Aepfelbacher,
Peter C. Weber,
Martin Aepfelbacher,
期刊:
Cell Biochemistry and Function
(WILEY Available online 1995)
卷期:
Volume 13,
issue 1
页码: 19-23
ISSN:0263-6484
年代: 1995
DOI:10.1002/cbf.290130106
出版商: John Wiley&Sons, Ltd.
关键词: Phospholipase A2;monocytes;1,25 (OH)2Vitamin D3;cell differentiation
数据来源: WILEY
摘要:
AbstractSoluble phospholipase A2activity was characterized in two human monocytic cell lines, U937 and Mono Mac 6. The enzyme showed an absolute requirement for Ca++, an alkaline pH optimum and Michaelis‐Menten kinetics in both cell lines. Differentiation of U937 and Mono Mac 6 cells with 1,25 (OH)2vitamin D3(10 nM, 72 h) enhanced PLA2activity by 82 per cent and 56 per cent, respectively. Furthermore, kinetic experiments revealed that enzyme activity increased within 3 h when cells were brought from the nonproliferative phase of growth to the start of a new cycle of cell proliferation. This initial activation of PLA2could be inhibited by cycloheximide and actinomycin D, indicating the requirement of gene transcription. Taken together, these results suggest a role of cytosolic, Ca++‐dependent PLA2in differentiation and growth of monocytic ce
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