Abstract
BACKGROUND—Tumour necrosis factor (TNF) is a predominant cytokine produced in the gastric mucosa of patients with Helicobacter pylori infection. TNF induces apoptosis in a variety of cells. The soluble TNF receptors (sTNF-Rs) can be divided into sTNF-RI and sTNF-RII, both of which inhibit TNF activity. However, their precise mechanisms remain unclear. AIM—To investigate the role of sTNF-Rs in H pylori infection. METHODS—In 40 patients, production of TNF and sTNF-Rs in gastric mucosa was measured using biopsy specimens. In addition, in gastric epithelial cells, sTNF-R release in response to TNF and the protective effect of sTNF-Rs against the cytotoxic and apoptotic activities of TNF were examined. RESULTS—TNF and sTNF-R expression was significantly higher in H pylori positive than H pylori negative patients. TNF dose-dependently induced sTNF-RI release from gastric epithelial cells. sTNF-RII was also released from the cells. TNF decreased cell viability, but the effect was very small. A combination of anti-sTNF-RI and anti-sTNF-RII monoclonal antibodies significantly increased TNF induced cytotoxicity and apoptosis of gastric epithelial cells. CONCLUSIONS—These results show that sTNF-Rs are actively produced in H pylori infected gastric mucosa. sTNF-Rs appear to protect gastric epithelial cells from TNF induced apoptosis in H pylori infection. Keywords: Helicobacter pylori; tumour necrosis factor; soluble TNF receptors; apoptosis; gastric mucosa; stomach
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Figure 1 .
Concentrations of tumour necrosis factor (TNF) and soluble TNF receptors (sTNF-Rs) in tissue culture supernatants of antral mucosa from patients with and without H pylori infection. (A) TNF; (B) sTNF-RI; (C) sTNF-RII. Bars represent mean values. TNF and sTNF-RII levels increased significantly in H pylori positive subjects (**p<0.01).
Figure 2 .
Relation between tumour necrosis factor (TNF) and soluble TNF receptor (sTNF-R) concentrations in tissue culture supernatants from H pylori positive subjects. (A) sTNF-RI, p<0.05, r = 0.344; (B) sTNF-RII, p<0.01, r = 0.523.
Figure 3 .
Comparison of tumour necrosis factor (TNF) and soluble TNF receptor (sTNF-R) expression according to inflammation score. (A) TNF, *p<0.05; (B) sTNF-RI; (C) sTNF-RII. Bars represent mean values.
Figure 4 .
Effect of tumour necrosis factor (TNF) on MKN45 cell viability. Data are expressed as mean (SD) (n = 8). *p<0.05. There are significant differences (p<0.05) between control and 1 ng/ml and 100 ng/ml TNF.
Figure 5 .
Release of soluble tumour necrosis factor (TNF) receptors (sTNF-Rs) from gastric epithelial cells by various concentrations of TNF for 24 hours. (A) sTNF-RI from MKN45 cells; (B) sTNF-RII from MKN45 cells; (C) sTNF-RI from KATO III cells; (D) sTNF-RII from KATO III cells. Data are expressed as mean (SD) (n = 8). *p<0.05, **p<0.01 v control. †p<0.01.
Figure 6 .
Target of anti-soluble tumour necrosis factor receptor (sTNF-R) monoclonal antibodies. (A) Anti-sTNF-RI; (B) anti-sTNF-RII. Lane 1, MKN45 cell lysate; lane 2, MKN45 cell culture supernatant.
Figure 7 .
Influence of anti-soluble tumour necrosis factor (TNF) receptor I (sTNF-RI) monoclonal antibody and/or anti-sTNF-RII monoclonal antibody on TNF cytotoxicity. The reduction in cell viability was dependent on the concentrations of both types of anti-sTNF-R monoclonal antibody. Data are expressed as mean (SD) (n = 6). †p<0.01 v control. *p<0.05; **p<0.01.
Figure 8 .
Agarose gel electrophoresis of DNA extracted from MKN45 cells exposed to tumour necrosis factor (TNF) and anti-soluble TNF receptor (sTNF-R) monoclonal antibodies for 96 hours. Lane 1, control (no TNF or anti-sTNF-R monoclonal antibodies); lane 2, TNF 100 ng/ml; lane 3, TNF 100 ng/ml + anti-sTNF-RI and anti-sTNF-RII monoclonal antibodies 20 µg/ml. Addition of anti-sTNF-R monoclonal antibodies induced a more conspicuous DNA ladder.
Figure 9 .
Detection of apoptosis by flow cytometric analysis. (A) MKN45 cells. (a) Cells were cultured for 96 hours in control medium; (b) cells were treated with tumour necrosis factor (TNF) 100 ng/ml alone; (c) cells were treated with TNF 100 ng/ml + anti-soluble TNF receptor I (sTNF-RI) and anti-sTNF-RII monoclonal antibodies 20 µg/ml. (B) KATO III cells. (a)-(c) are the same as for MKN45 cells. These are representative of two dimensional frequency contour plots of forward scatter (linear scale) v propidium iodide (PI)-DNA content (logarithmic scale). Apoptosis was recognised in area 3. (A) (a), (b), (c): 3.0%, 6.2%, 9.6% respectively. (B) (a), (b), (c): 3.0%, 5.9%, 20.2% respectively. Addition of anti-sTNF-R monoclonal antibodies induced apoptosis more conspicuously (p<0.01).
Figure 10 .
Detection of mRNA for tumour necrosis factor receptor I (TNF-RI) and TNF-RII in gastric epithelial cells by reverse transcriptase polymerase chain reaction (PCR). Ethidium bromide stained gels containing PCR products of reverse transcribed TNF-RI mRNA (A) and TNF-RII mRNA (B) in MKN45 cells, and TNF-RI mRNA (C) and TNF-RII mRNA (D) in KATO III cells. Lane 1, 100 bp DNA markers; lane 2, mRNA from untreated cells; lane 3, mRNA from cells treated with TNF 100 ng/ml for 96 hours. In (A) and (B), mRNA of lanes 2 and 3 were expressed equally. In (C) and (D), mRNA of lane 3 was expressed slightly more strongly than that of lane 2.
Figure 11 .
Immunoblotting analysis of membrane associated tumour necrosis factor (TNF) receptor I (TNF-RI) and TNF-RII on gastric epithelial cells with and without TNF (100 ng/ml) for 96 hours. (A) 55 kDa TNF-RI in MKN45 cells; (B) 75 kDa TNF-RII in MKN45 cells; (C) 55 kDa TNF-RI in KATO III cells; (D) 75 kDa TNF-RII in KATO III cells. Lane 1, untreated; lane 2, treated with TNF. Expression of TNF-RI and TNF-RII decreased after treatment with TNF.
Selected References
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