Relationship between the increase of secretion of sTNFα induced by lipopolysaccharides and the enhanced expression of TACE mRNA in HL-60 cells and adhesive cells from human spleen |
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Authors: | Ding Tingbo M D Ph D Li Lingbo Zhu Kongli Huang Wei Yang Yuzhen |
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Institution: | (1) Department of Molecular Biology, Research Center of Experimental Medicine, Tongji Medical College, Huazhong University of Science and Technology, 430030 Wuhan;(2) Department of Biochemistiy, Institute of Pharmacology, Shanghai Fudan Medical College, 200032 Shanghai |
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Abstract: | Summary In order to find out the potential modulators which influence the secretion of TNFα, the relationship between the amount of
secreted TNFα(sTNFα) and the level of TNFα converting enzyme (TACE) gene expression was studied before and after the stimulation
by lipopolysaccharides (LPS) to HL-60 cells and adhered cells isolated from human spleen using cytological and molecular biology
techniques and methods (RT-PCR, Dot-blot hybridization, etc.). The experimental results showed that: (1) LPS could induce
the increase of expression of TNFα mRNA and TACE mRNA, reaching the peak value at 6 h and 10 h respectively after addition
of LPS into cell culture medium; (2) The anti-sense oligodeoxyribonucleotide (A-ODN) complementary to TACE mRNA sequence really
inhibited the secretion of TNFα as a result of blocked translation of TACE gene; (3) Furthermore, it was also observed that
RDQ, a kind of injection derived from Chinese traditional herb, had strongly inhibitory effects on the expression of TACE
mRNA and secretion of sTNFα stimulated by LPS. The above results suggested that the TACE indeed involved in delivering and
processing of pro-TNFα during the period of LPS stimulation and the study about the regulator/inhibitors of TACE gene expression
would be very important to develop new types of therapy agents against toxic and side effects of sTNFα during the peroid of
infection/inflammation to human body.
This project was supported by a grant from Chinese National Natural Sciences Foundation of China (No. 39630320). |
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Keywords: | TNFα TNFα converting enzyme lipopolysaccharides anti-sense oligodeoxyribonucleotide |
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