Abstract
The prognosis of rhabdomyosarcoma (RMS) in advanced stages is still sobering. Therapy is limited due to local tumor recurrence, development of metastases and multidrug resistance. The aim of this study was to investigate the development of multidrug resistance in cell lines and in xenografts of alveolar and embryonal RMS treated according to the German Soft Tissue Sarcoma Study (CWS). Alveolar and embryonal RMS cell lines were treated with Vincristine, Topotecan, Carboplatin, Actinomycin D, or Ifosfamide. Expression levels of resistance-associated genes were assessed using Real time-PCR. Nude mice (NMRI nu/nu, n = 10 per group) underwent xenotransplantation of human embryonal or alveolar RMS. Animals were treated with standard chemotherapeutic drugs Vincristine, Topotecan, Carboplatin, Actinomycin D, or Ifosfamide according to treatment schedules of the CWS-study. Tumor sizes were measured and relative tumor volumes were calculated. Animals were sacrified after 20 days and standard histology, Real-time-PCR for MDR1-, MRP-, LRP- and MDM2-gene as well as immunhistochemistry for MDR1-, LRP-, and MRP-protein were performed. In the cell lines, an up-regulation of MDR-1 gene was found in alveolar rhabdomyosarcoma. In embryonal rhabdomyosarcoma, an up-regulation of LRP and MRP was found. Standard chemotherapy of alveolar rhabdomyosarcoma resulted in a significant reduction of tumor growth (P < 0.05) in all groups. In embryonal rhabdomyosarcoma strongest effects were found after treatment with Ifosfamide, Vincristine and Carboplatin (P < 0.05). RT-PCR revealed a MDR1-dependent mechanism in alveolar rhabdomyosarcoma. In embryonal rhabdomyosarcoma, MDR1 occurred to a lower degree. Immunhistochemistry revealed correlating expression levels of multidrug resistance-associated proteins. The use of established chemotherapy on human RMS in vivo had strong effects on xenografts compared to their controls. In all cases, there was only a reduction of tumor growth, but not a complete eradication of the tumors. Chemotherapy seemed to upregulate the expression of resistance-associated genes in vitro and in vivo. The mechanism of multidrug resistance depends on the tumor subtype. Therefore, further investigations will be required to evaluate multidrug resistance in patients and to investigate new modalities for a reversal of multidrug resistance.
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This work was supported by the Fortüne-Program of the Medical Faculty, University of Tuebingen, Germany (Grant: 1278-0-0).
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Seitz, G., Warmann, S.W., Vokuhl, C.O. et al. Effects of standard chemotherapy on tumor growth and regulation of multidrug resistance genes and proteins in childhood rhabdomyosarcoma. Pediatr Surg Int 23, 431–439 (2007). https://doi.org/10.1007/s00383-006-1852-z
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DOI: https://doi.org/10.1007/s00383-006-1852-z