Abstract:
:To clarify the biological significance of tumour necrosis factor alpha (TNF-alpha) precursor, we analysed its expression at the primed and triggered stages using human monocyte-like cell line THP-1. To prime them, THP-1 cells were treated with either recombinant human interferon gamma (rIFN-gamma) or recombinant human tumour necrosis factor alpha (rTNF-alpha). At the primed stage, transient accumulation of TNF-alpha, mRNA and a small amount of 26-KDa TNF-alpha precursor was observed, and the precursor molecule was located on the cell surface. Following treatment of the primed cells with bacterial lipopolysaccharide (LPS), augmentation of transcription of TNF-alpha mRNA and production of a larger amount of TNF-alpha precursor were observed followed by secretion of a larger amount of mature TNF-alpha (17-KDa) than secreted by the unprimed cells (triggered stage). This suggests that with priming THP-1 cells might be changed to a stage where they are ready for production of a larger amount of TNF-alpha at the triggered stage. When either primed or unprimed THP-1 cells were pretreated with anti-TNF-alpha antibody, augmentation of TNF-alpha production by primed THP-1 cells was specifically suppressed, suggesting that TNF-alpha precursor itself may play an important role in the enhancement of TNF-alpha production by the primed macrophages after treatment with LPS.
journal_name
Cytokinejournal_title
Cytokineauthors
Tanabe Y,Kitahara-Tanabe N,Mizuno D,Soma GIdoi
10.1016/1043-4666(94)90056-6subject
Has Abstractpub_date
1994-07-01 00:00:00pages
337-48issue
4eissn
1043-4666issn
1096-0023pii
1043-4666(94)90056-6journal_volume
6pub_type
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