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  • cell-mediated cytotoxicity  (2)
  • Advanced carcinoma  (1)
  • Colorectal carcinoma  (1)
  • 1
    ISSN: 1530-0358
    Keywords: Ornithine decarboxylase ; c-myc ; Proto-oncogene ; Reverse transcriptase-polymerase chain reaction ; Colorectal carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: Ornithine decarboxylase (ODC) is a rate-limiting enzyme for polyamine synthesis. An elevated protein level of ODC was observed in the tumors. There has been, however, little information reported so far on the expression of ODC messenger ribonucleic acid (mRNA) in clinical colorectal carcinomas.In vitro studies disclosed that the transcriptions of the ODC gene is regulated by the c-myc gene. METHODS: The expression of ODC and c-myc mRNA in biopsy specimens obtained from both tumor tissue and the corresponding normal tissue was examined by the reverse transcriptase polymerase chain reaction method in 40 cases of colorectal carcinoma. RESULTS: The expression of ODC mRNA was observed in both tumor tissue and normal tissue. The tumor to normal ratio of ODC mRNA was higher in cases with deeply invasive tumors than in cases with shallow tumors, and it was also higher in Dukes B or C cases than in Dukes A cases. There was a significant correlation between the tumor to normal ratio of c-myc mRNA and that of ODC mRNA in each case. CONCLUSIONS: These findings suggested that 1) the study of the expression of ODC mRNA may be useful for preoperatively predicting more advanced disease of colon carcinoma, and 2) there was a significant correlation between expression of ODC and c-myc mRNA in the clinical samples, which was similar to the findings of a previous in vitro study.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-2813
    Keywords: cell-mediated cytotoxicity ; regional lymph nodes ; gastric carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cell-mediated cytotoxic activities of cells from the perigastric lymph nodes (LNC) were assayed in patients with gastric carcinoma. These activities were compared with those of the peripheral blood mononuclear cells (PBM), and also with the LNC of patients with benign lesions. The capacity of LNC to be converted to cytotoxic cells in mixed cell culture was significantly impaired in the cancer patients as compared to that of either the PBM from the same patients, or the LNC from patients with benign lesions. The natural killer cell (NK) activity of LNC was significantly lower than that of the PBM in both groups of patients. The cytotoxic activity induced by phytohemagglutinin activation (PAK) in the LNC from patients with carcinoma, as well as from those with benign lesions was also significantly decreased, when compared to that of the PBM, although the ability of LNC to produce interleukin 2 (IL 2) was significantly increased. The ability of these cells to generate cytotoxicity after activation with IL 2 (LAK) was therefore examined, and a decreased capacity in LNC was observed. These results indicated that the ability of T cells in LNC to develop into cytotoxic cells in patients with gastric carcinoma was impaired, and that the nonspecific cytotoxicity, including NK or PAK, as well as LAK activity, was essentially low in the perigastric lymph nodes.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0851
    Keywords: Eosinophilia ; Antitumor response ; Interleukin-2 ; Mitomycin C ; Advanced carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary On the basis of our clinical findings that the ability of cancer patients to generate lymphokine-activated killer cells became markedly augmented after mitomycin C administration, we designed a treatment regimen comprising mitomycin C 12 mg/m2, i.v. on day 1 and recombinant interleukin-2 700 U/m2 (8000 IU/kg), i.v. every 12 h from day 4 through day 8. The treatment course was repeated at almost 7-day intervals. Altogether 33 patients with advanced carcinoma, including mainly gastrointestinal carcinoma, were treated with this regimen. Of these, 10 had a partial response (PR) and 4 had a minor response (MR). Since eosinophil counts peaked 1 day after either the first or second course of the therapy, the posttreatment values were compared to each pretreatment level, with regard to the clinical antitumor response to this treatment. When patients who showed PR were defined as responders, absolute eosinophil counts and the percentages of eosinophils in responders after both the first and second courses of the therapy were significantly greater than each pretreatment value or the posttreatment level in nonresponders. Further, these findings were almost identical, when both PR and MR were considered to be a true remission and therefore patients who exhibited PR or MR were defined as responders, although the difference between posttreatment levels of eosinophils in responders and nonresponders was not significant at the second course. These results indicate that eosinophilia induced by this treatment correlates with the clinical response to this therapy.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1436-2813
    Keywords: cell-mediated cytotoxicity ; spleen cells ; interleukin 2 ; activated killer cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cell-mediated cytotoxic activities of cells from the spleens (SP cells) of patients with gastric carcinoma were assayed in comparison with the activities of peripheral blood mononuclear cells (PBM cells) from the same patients, and from patients with benign lesions. The natural killer cell (NK) activity of the SP cells and their capacity to generate allogeneic cytotoxicity in mixed lymphocyte culture (MLC) were very similar to those of the PBM cells. The cytotoxic activity of SP cells induced by alloactivation in MLC, however, was significantly higher than that of the PBM cells from the same patient as well as from patients with benign lesions. The production of interleukin 2 (IL 2) and the ability to induce cytotoxic cells after activation with IL 2 (LAK) were therefore examined. Both the ability to produce IL 2 and to generate LAK cells were shown to be significantly increased in SP cells when compared to PBM cells. These results indicate that the spleen may be a potential reservoir for the precursors of these activated killer cells in patients with gastric carcinoma. Furthermore, it may play an important role in the defence against tumors in these patients.
    Type of Medium: Electronic Resource
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