Abstract:In vitro proliferation and in vivo tumorigenicity of IL-2 and/or IL-3 gene transfected FBL-3erythroleukemia cells were observed to investigate the anti-tumor effect of tumor vaccine. Methods: Leukemiacells were trans fected with IL-2 and/or IL-3 adenovlrus vector. The cytokine expressions were assayed, and the growth characteristics of the transfected FBL-3 cells were studied. Results: High levels of secreted IL-2 and IL-3remained for one week after transfection, and the trans fected leukemia cells became unchanged in growth in vitro and showed weak tumorigenicity in vlvo. The tumorigenicity of FBL-3 cells decreased more significantly when FBL-3 cells were transfected with both IL-2 gene and IL-3 gene than when FBL-3 cells were tran fected with IL-2or IL-3 gene only. The tumor growth was significantly delayed and survival time of the trans fected FBL-3 inoculat ed mice was significantly prolonged. Conclusion: The inhibition of tumor growth is most likely dependent on immune response induced by IL-2
Abstract:Effects of amniotic fluid embolism-like plasma (AFEP) on the isolated perfused rabbit lungs (IPRL)were studied. It was found that AFEP could induce elevation of pulmonary artery pressure (PAP) and development of lung edema, which could be partially prevented by ibuprofen, a cycloxygenase inhibit0r, but amniotic fluid itself could not cause elevation of PAP and lung edema. The result suggests that AFEP-induced mediator from whole blood cells may be the important factor resulting in above-mentioned pathological changes.
Abstract:Objective: To observe immunomodulation and antitumor effect of melatonin (MLT) in tumor-bearingmice. Methods: By means of flow cytometry and MTT colorimetry, the immunological indexes of H22 hepatoma-bearing mice were investigated. Results: MLTadministration could increase the CD4t/CD8t cell ratio in the pe-ripheral blood of the tumor-bearing mice, cooperate with IL-2 to promote the proliferation of lymphocytes andeosinophils, increase NK and LAK activity of splenocytes, and enhance the production of IL-2 from splenocytes.We also found that MLT could inhibit tumor growth and prolong the survival time of the tumor-bearing mice in vi-vo. Moreover,a synergetic effect of IL-2 and MLT was observed. It seems that MLT hadno effect on H22 hep-atoma cell growth in vitro. Conclusion: It is suggested that MLT may be a potential candidate for tumor im-munotherapy as one of the biological reaction modulators (BRM).