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  • 1
    ISSN: 1432-1335
    Keywords: Ehrlich ascites tumor cells ; Methylglyoxal ; Glucosone ; Galactosone ; Growth inhibition ; DNA synthesis ; Protein Synthesis ; Energy Metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Proliferation of in vitro grown Ehrlich ascites tumor cells is completely inhibited by 0.2–0.4 mM methylglyoxal and 1–2mM glucosone or galactosone without severely affecting viability (dye exclusion test); no phase-specific arrest of cell growth is observed. 2. Incorporation of [14C] thymidine into the acid-insoluble fraction of the cells decreases within a few minutes to less than 50% of that in controls in the presence of 0.4 mM methylglyoxal, and 2 mM glucosone or galactosone causes a comparable inhibition of DNA synthesis after 2 h or 4 h, respectively. 3. The action of 0.4 mM methylglyoxal inhibits incorporation of [14C] leucine within a few minutes by more than 70%, while 2 mM glucosone and galactosone are significantly less effective (50%–60% inhibition after 12 h). 4. While methylglyoxal and galactosone do not severely affect lactate production of the cells, 2 mM glucosone reduces glycolysis by 60%–70%; ATP/ADP ratios did not fall below 3.5 in the presence of the inhibitors (controls 4–6). 5. It is suggested that the reaction potentialities of the oxaldehyde function of the inhibitors play an important role in their growth-inhibitory acitivity, besides exerting a specific effect on hexokinase (glucosone) and UTP-trapping activity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4726
    Keywords: Monoclonal antibody ; Epidermal growth factor receptor ; Head and neck cancer ; Clinical trials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The murine IgG2a monoclonal antibody (mAb) EMD 55900 was produced against the human epidermoid carcinoma cell line A431, with binding occurring to the polypeptide chain of the external domain of human epidermal growth factor receptor (EGF-R). In the present clinical study, 12 patients with advanced squamous cell carcinoma of the larynx or hypopharynx received a single dose of either 20, 100 or 400 mg EMD 55900 3 days prior to laryngectomy and neck dissection. Clinical signs and laboratory parameters of toxicity, development of human anti-mouse antibodies, and mAb plasma concentrations were monitored. In tumor specimens studied from primary tumors and lymph node metastases, expression of EGF-R, distribution of EMD 55900, and occupation of EGF-R by EMD 55900 (double staining) were determined by immunohistochemistry. Single-dose administration of EMD 55900 was very well tolerated in all patients, and good (100 mg) to excellent (400 mg) homogeneous binding of mAb to EGF-R was obtained in the advanced laryngeal and hypopharyngeal carcinomas studied.
    Type of Medium: Electronic Resource
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