Sensitization of human colon adenocarcinoma cells (LoVo) to reactive oxygen species by a lysosomotropic compound

  • Authors:
    • Enzo Agostinelli
    • Laura Dalla Vedova
    • Francesca Belli
    • Maria Condello
    • Giuseppe Arancia
    • Nikolaus Seiler
  • View Affiliations

  • Published online on: October 1, 2006     https://doi.org/10.3892/ijo.29.4.947
  • Pages: 947-955
Metrics: Total Views: 0 (Spandidos Publications: | PMC Statistics: )
Total PDF Downloads: 0 (Spandidos Publications: | PMC Statistics: )


Abstract

The in situ formation of cytotoxic metabolites by an enzyme-catalyzed reaction is a recent approach in cancer therapy. The present results show that multidrug-resistant human colon adenocarcinoma cells (LoVo) are significantly more sensitive than corresponding wild-type cells to hydrogen peroxide and aldehydes, the products of bovine serum amine oxidase (BSAO)-catalyzed oxidation of spermine. Pre-treatment of the cells with N1,N4-bis(2,3-butadienyl)-1,4-butanediamine (MDL 72527), a lysosomotropic compound, sensitized both cell lines to the subsequent exposure to spermine metabolites, as was evident from the decrease of cell survival by a log unit. The sensitizing effect was greater in the case of the multidrug-resistant cell line, an aspect of particular importance with respect to potential therapeutic applications of the method, since conventional cancer therapy suffers from the development of drug resistance. Cell viability was determined using a clonogenic assay. MDL 72527 (at 300 µM) produced numerous cytoplasmic vacuoles, presumably of lysosomal origin, after 6-h exposure, which decreased in size and number (in the presence of the drug) by 24 h and had almost disappeared completely at 48 h. Mitochondrial damage, as observed by transmission electron microscopy, seemed to correlate better with the cytotoxic effects of the treatment than the formation of vacuoles. We suggest that the release of lysosomal enzymes into the cytosol by MDL 72527 is the main reason for its sensitizing effect. It is known that lysosomotropic compounds, which release lysosomal enzymes, produce oxidative stress and apoptosis.

Related Articles

Journal Cover

October 2006
Volume 29 Issue 4

Print ISSN: 1019-6439
Online ISSN:1791-2423

Sign up for eToc alerts

Recommend to Library

Copy and paste a formatted citation
APA
Agostinelli, E., Vedova, L.D., Belli, F., Condello, M., Arancia, G., & Seiler, N. (2006). Sensitization of human colon adenocarcinoma cells (LoVo) to reactive oxygen species by a lysosomotropic compound. International Journal of Oncology, 29, 947-955. https://doi.org/10.3892/ijo.29.4.947
MLA
Agostinelli, E., Vedova, L. D., Belli, F., Condello, M., Arancia, G., Seiler, N."Sensitization of human colon adenocarcinoma cells (LoVo) to reactive oxygen species by a lysosomotropic compound". International Journal of Oncology 29.4 (2006): 947-955.
Chicago
Agostinelli, E., Vedova, L. D., Belli, F., Condello, M., Arancia, G., Seiler, N."Sensitization of human colon adenocarcinoma cells (LoVo) to reactive oxygen species by a lysosomotropic compound". International Journal of Oncology 29, no. 4 (2006): 947-955. https://doi.org/10.3892/ijo.29.4.947