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The absence of functional glucosylceramide synthase does not sensitize melanoma cells for anticancer drugs

Robert Jan Veldman1, Alain Mita, Olivier Cuvillier

  • 1INSERM U.466, Laboratoire de Biochimie, Institut Louis Bugnard, CHU Rangueil, 1 avenue Jean Poulhès, TSA 50032, 31059 Toulouse Cedex 9, France.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|April 15, 2003
PubMed

Insights

Glucosylceramide synthase (GCS) activity does not influence anticancer drug resistance in melanoma cells. Modifying ceramide glycosylation genetically or pharmacologically did not alter drug sensitivity, suggesting limited role in resistance mechanisms.

Area of Science:

  • Biochemistry
  • Cancer Biology
  • Pharmacology

Background:

  • Ceramide metabolism into glucosylceramide by glucosylceramide synthase (GCS) is linked to anticancer drug resistance.
  • Understanding the role of ceramide glycosylation in drug resistance is crucial for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the role of glucosylceramide synthase (GCS) in mediating resistance to anticancer drugs in melanoma cells.
  • To determine if inhibiting or enhancing ceramide glycosylation affects cellular sensitivity to chemotherapy.

Main Methods:

  • Compared GCS-deficient mouse melanoma cells (GM95) with GCS-overexpressing cells (GM95/GCS).
  • Assessed cellular sensitivity to various anticancer drugs (doxorubicin, vinblastine, paclitaxel, cytosine arabinoside) and short-chain ceramide analogs.
  • Measured caspase activation, cytochrome c release, and ceramide/glucosylceramide levels.
  • Utilized a GCS inhibitor (N-(n-butyl)deoxynojirimycin) to assess pharmacological effects.

Main Results:

  • GM95/GCS cells exhibited normal ceramide glycosylation.
  • No significant difference in sensitivity to tested anticancer drugs or ceramide analogs was observed between GM95 and GM95/GCS cells.
  • Doxorubicin treatment led to similar ceramide accumulation in both cell lines.
  • Metabolism of drug-induced ceramide into glucosylceramide did not appear to enhance cell survival.
  • Pharmacological inhibition of GCS did not sensitize wild-type melanoma cells to chemotherapy.

Conclusions:

  • Genetic or pharmacological modulation of ceramide glycosylation capacity does not sensitize melanoma cells to anticancer drugs.
  • Ceramide glucosylation plays a limited role in the mechanisms of anticancer drug resistance.

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