Characterization of the endolysosomal system in human chordoma cell lines: is there a role of lysosomes in chemoresistance of this rare bone tumor?
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Chordoma is a rare tumor of the bone derived from remnants of the notochord with pronounced chemoresistance. A common feature of the notochord and chordoma cells is distinct vacuolization. Recently, the notochord vacuole was described as a lysosome-related organelle. Since lysosomes are considered as mediators of drug resistance in cancer, we were interested whether they may also play a role in chemoresistance of chordoma. We characterized the lysosomal compartment in chordoma cell lines by cytochemistry, electron microscopy (ELMI) and mutational analysis of genes essential for the physiology of lysosomes. Furthermore, we tested for the first time the cytotoxicity of chloroquine, which targets lysosomes, on chordoma. Cytochemical stainings clearly demonstrated a huge mass of lysosomes in chordoma cell lines with perinuclear accumulation. Also vacuoles in chordoma cells were positive for the lysosomal marker LAMP1 but showed no acidic pH. Genetic analysis detected no apparent mutation associated with known lysosomal pathologies suggesting that vacuolization and the huge lysosomal mass of chordoma cell lines is rather a relict of the notochord than a result of transformation. ELMI investigation of chordoma cells confirmed the presence of large vacuoles, lysosomes and autophagosomes with heterogeneous ultrastructure embedded in glycogen. Interestingly, chordoma cells seem to mobilize cellular glycogen stores via autophagy. Our first preclinical data suggested no therapeutically benefit of chloroquine for chordoma. Even though, chordoma cells are crammed with lysosomes which are according to their discoverer de Duve “cellular suicide bags”. Destabilizing these “suicide bags” might be a promising strategy for the treatment of chordoma.
KeywordsChordoma Lysosomes Glycogen Glycophagy Chloroquine
The authors would like to thank Marie-Therese Frisch for her technical assistance. This work was supported by the Medical University of Graz, a grant from the Austrian Science Fund (FWF), P24006 (to RF) and by private donations obtained via a fund-raising campaign kindly initiated by MEFOgraz (to RF). The identity of donors remained completely anonymous for all authors involved, excluding any conflict of interest in this regard. No commercial benefits of any kind have been or will be received from institutions related directly or indirectly to the subject of the manuscript.
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Conflict of interest
The authors declare that they have no conflict of interest.
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