Study of the effects of LPS on the TACE gene expression and its function.
In order to investigate the effects of LPS on the TACE gene transcription and expression and its regulating effect on the TM-TNF secretion, in vitro studies were carried out on HL-60 cells stimulated by LPS. TACE, TNF-alpha mRNA levels were detected by Dot-Elisa and the distribution of membrane molecules determined by flow cytometry assay and indirect immunofluorescence. The results showed that: (1) TACE was detected in or on HL-60 cells and it is predominantly localized on cell surface and to a perinuclear compartment. (2) LPS induced a time dependent increasement of TNF-alpha mRNA and enhanced TNF conversion with decreasing distribution of TNF in cell surface and increasing secretion of TNF protein. Such conversion could be inhibited by TACE ODN. (3) LPS also induced time-dependently increased expression of TACE gene and activation of its function. On the other hand, TACE protein in cell lysate and on cell surface was decreased. It was suggested that TACE molecular structure might change following its mediating membrane-anchored molecular secretion.
Li
Lingbo
L
Department of Immunology, School of Basic Medical Sciences, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030.
Yang
Yuzhen
Y
Wang
Zhen
Z
Gong
FeiLi
F
D051722:ADAM Proteins; D000072198:ADAM17 Protein; D015870:Gene Expression; D018922:HL-60 Cells; D006801:Humans; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008666:Metalloendopeptidases / Q000096:biosynthesis / Q000235:genetics*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D014158:Transcription, Genetic; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis / Q000235:genetics*
D008070:Lipopolysaccharides; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D051722:ADAM Proteins; D008666:Metalloendopeptidases; D000072198:ADAM17 Protein; C000606462:ADAM17 protein, human