Mechanism of action of recombinant interleukin-2 combined with allicin in treatment of pancreatic cancer / 临床肝胆病杂志

ObjectiveTo investigate the effect of recombinant interleukin-2 (rIL-2) combined with allicin in the treatment of pancreatic cancer and related mechanisms. MethodsA nude mouse xenograft model was established. A total of 60 nude mice were randomized into control group, rIL-2 treatment group, allicin treatment group, and combined treatment group. At 4 weeks after treatment, peripheral blood was collected, tumor volume, tumor weight, and survival time were recorded, and survival rates were calculated. Flow cytometry was used to analyze the apoptosis of tumor cells and measure the percentages of CD4+ T, CD8+ T, and natural killer (NK) cells, ELISA was used to measure the level of interferonγ (IFNγ), and Western blot was used to measure the expression of Bcl-2 protein in tumor tissue. An analysis of variance was used for comparison of continuous data between groups, and SNK-q test was used for further comparison between any two groups. ResultsAt 4 weeks after treatment, the rIL-2 treatment group, allicin treatment group, and combined treatment group showed significant reductions in tumor volume compared with the control group (all P＜0.05), and the combined treatment group showed the greatest reduction (P＜0.01). The combined treatment group had a tumor inhibition rate of 90.5% and a prolonged survival time (60% of the mice survived at 55 days). Compared with the control group, the combined treatment group showed significant increases in the apoptosis rate of tumor cells (233%±4.3% vs 90%±3.7%, P＜0.05) and the expression of pro-apoptotic protein Bcl-2. The treatment groups showed significant increases in the percentages of CD4+ T, CD8+ T, and NK cells compared with the control group (F=23.74, 26.38, and 1972, all P＜0.001). Compared with the other three groups, the combined treatment group showed a significant increase in the IFNγ level (F=9.84, P=0.026). ConclusionCombined treatment with allicin and rIL-2 can enhance the innate immunity and adaptive immunity and thus improve the survival of pancreatic cancer.

Six-month Therapy with Aerosolized Interferon-gamma for Refractory Multidrug-Resistant Pulmonary Tuberculosis

The aim of this study was to investigate the adjuvant effects of interferon-gamma (IFN-gamma) inhalation therapy for six months in the treatment of refractory multidrug-resistant pulmonary tuberculosis (MDR-TB). Aerosolized IFN-gamma was given to six MDRTB patients with persistent positive smears and cultures despite long-term medical treatment. The patients received aerosolized two million international units of IFNthree times a week for 6 months while they continued on identical antituberculous chemotherapy. Before IFN-gamma inhalation therapy, the patients received a median of 6.5 (range, 4 to 7) antituberculous drugs for median duration of 29 months (range,7 to 76). After IFN-gamma inhalation therapy, sputum smears remained persistently positive in all patients throughout the study period. Sputum cultures were transiently negative at the 4th month in two patients, but became positive again at the end of 6 months of IFN-gamma therapy. Five patients had radiological improvement including three patients who showed a decrease in the size of the cavitary lesions. Resectional surgery could be performed in one patient in whom substantial clinical and radiological improvement was noted after IFN-gamma inhalation therapy. These results suggest that IFN-gamma inhalation therapy may be effective for some cases of refractory MDR-TB who are otherwise not responding to conventional therapy.

Expression of human interferon-?gene in colon cancer cell / 中国普通外科杂志

Objective This study was to investigate the expression of human interferon ?(huIFN ?) gene in colon cancer cells. MethodsThe whole length cDNA of huIFN ? was subcloned into the expression vector pcDNA 3 after sequence measurement. Lipofectamine was used to transfer huIFN ? gene into three colon cancer cell lines(LOVO?SW620?HCT116BG) .The integration and expression of huIFN ? were identified by PCR and RT PCR respectively, the activity of IFN ? expressed in different cell lines was measured by ELISA. Results PCR and RT PCR showed successful integration and sustained expression of huIFN ? in 3 colon cancer cell lines. Conclusion The huIFN ? can be effectively transduced into human colon cancer cells, and sustained expression was obtained.

Study of cytotoxicity of anti-CD20 monoclonal antibody against myeloma cells in vitro / 中国病理生理杂志

AIM: To observe the cytotoxicity on myeloma cells mediated by anti-CD20 monoclonal antibody-mabthera, after heightening level of CD20 expression on myeloma cells membrane by ?-interferon. METHODS: 10 untreated(UT) and 10 relapsed or refractory(RR) MM patients'myeloma cells were cultured with human recombinant ?-interferon (hr?-IFN) at concentrations of (0-800)?10~3 U/L to heighten level of CD20 expression, then complement-dependent cytotoxicity (CDC) and antibody-dependent cell-mediated cytotoxicity (ADCC) on myeloma cells mediated by mabthera were studied through MTT methods. RESULTS: When CD20 expression of UT MM and RR MM patients' myeloma cells increased after treated by hr?-IFN, 12 mg/L and 16 mg/L mabthera mediated ADCC and CDC (against) myeloma cells in group UT patients and group RR patients, respectively. CONCLUSION: After heightened level of CD20 expression on myeloma cells membrane by hr?-IFN, mabthera mediated ADCC and CDC against myeloma cells in vitro.

CD40 Expression on Melanocytes Induced by IFN-? and Its Significance / 中华皮肤科杂志

Objective To study CD40 expression on melanocytes induced by IFN-?and its significance. Methods CD40 expression was detected by flow cytometry. The capacity of melanocytes to stimulate T lymphocytes was evaluated by mixed ly mphocyte reaction and the supernatant cytokine levels were determined by ELISA. ResultsHuman melanocytes(MC) cultured in vitro expressed low but detectable CD40 surf ace protein. The surface expression of CD40 was markedly up-regulated by stimul ation with interferon(IFN)-?with different concentrations for 24 hours,48 hour s and 72 hours, respectively. The expression of CD40 was correlated with IFN-? levels after 24 hour incubation. MC underwent a morphologic change with an incre ased capacity to stimulate allogenic lymphocytes to proliferate after IFN-?sti mulation. Optimal enhancement of stimulating index(SI) was observed at an IFN-?concentration of 300 IU/ml after 72 hour treatment. Meanwhile concentrations o f interleukin-12 but not interleukin-8 or 10 were obviously increased in the s upernatants of cultured MC. Furthermore, ligation of CD40 via soluble CD40 ligan d(SCD40L) could enhance CD80 and ICAM-1 expression, which could be blocked by s pecific monoclonal antibody to CD40L. Conclusions Since CD40-CD40L is a pair of important and special costimulating signal, it is of great value to elucidate t he fact that CD40 is functionally expressed on MC, thus for a better understandi ng of MC′s role in cellular immune responses. MC might activate cytotoxic T lym phocyte directly and not via CD4 positive lymphocyte.