EFFECTS OF THE MICROTUBULE-DISTURBING AGENTS DOCETAXEL (TAXOTERE(R)), VINBLASTINE AND VINCRISTINE ON EPIDERMAL GROWTH FACTOR-RECEPTOR BINDING OF HUMAN BREAST-CANCER CELL-LINES IN-VITRO

被引:14
作者
HANAUSKE, AR
DEPENBROCK, H
SHIRVANI, D
RASTETTER, J
机构
[1] The authors are at the Division of Haematology and Oncology, I. Medical Department, Klinikum rechts der Isar, D-81675 München
关键词
EPIDERMAL GROWTH FACTOR; RECEPTOR BINDING; DOCETAXEL; VINBLASTINE; VINCRISTINE; BREAST CANCER;
D O I
10.1016/0959-8049(94)00338-6
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Epidermal growth factor (EGF) is a mitogenic peptide that binds to surface membrane receptors (EGFR) of breast cancer cells. After binding, secondary transmitter molecules are activated by tyrosine phosphorylation of the intracellular receptor domaine. The activity of the EGF/EGFR system can be modulated by a variety of chemically unrelated compounds including cytostatic agents. The purpose of our present study was to determine the effects of mitotic inhibitors on EGF receptor binding on human breast cancer cells. We found that MDA-231 and MDA-468 cells bind substantially more [I-125]EGF after preincubation with docetaxel, vinblastine and vincristine. This effect was concentration- and time-dependent, reaching a maximum at 3000 ng/ml and 48 h incubation for docetaxel, and 100 ng/ml and 48 h incubation for vinca alcaloids. Subsequent experiments showed an increase in the rate of EGF binding as well as maximal binding capacity. Scatchard analysis of binding experiments under equilibrium conditions indicated that this was due to an increase in the number of apparent EGF binding sites, Modulation of EGF receptor binding by docetaxel, vinblastine, and vincristine was not detectable when isolated membranes were used, indicating that intact cytoplasmatic mechanisms are required for the upregulation of EGF receptors.
引用
收藏
页码:1688 / 1694
页数:7
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