Intracellular localization and trafficking of fluorescein-labeled cisplatin in human ovarian carcinoma cells.

Roohangiz Safaei, Kuniyuki Katano, Barrett J Larson, Goli Samimi, Alison K Holzer, Wiltrud Naerdemann, Mika Tomioka, Murray Goodman, Stephen B Howell

Journal: Clinical cancer research : an official journal of the American Association for Cancer Research 2005;11(2 Pt 1):756-67

PMID: 15701866

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Abstract

PURPOSE

We sought to identify the subcellular compartments in which cisplatin [cis-diamminedichloroplatinum (DDP)] accumulates in human ovarian carcinoma cells and define its export pathways.

EXPERIMENTAL DESIGN

Deconvoluting digital microscopy was used to identify the subcellular location of fluorescein-labeled DDP (F-DDP) in 2008 ovarian carcinoma cells stained with organelle-specific markers. Drugs that block vesicle movement were used to map the traffic pattern.

RESULTS

F-DDP accumulated in vesicles and were not detectable in the cytoplasm. F-DDP accumulated in the Golgi, in vesicles belonging to the secretory export pathway, and in lysosomes but not in early endosomes. F-DDP extensively colocalized with vesicles expressing the copper efflux protein, ATP7A, whose expression modulates the cellular pharmacology of DDP. Inhibition of vesicle trafficking with brefeldin A, wortmannin, or H89 increased the F-DDP content of vesicles associated with the pre-Golgi compartments and blocked the loading of F-DDP into vesicles of the secretory pathway. The importance of the secretory pathway was confirmed by showing that wortmannin and H89 increased whole cell accumulation of native DDP.

CONCLUSIONS

F-DDP is extensively sequestered into vesicular structures of the lysosomal, Golgi, and secretory compartments. Much of the distribution to other compartments occurs via vesicle trafficking. F-DDP detection in the vesicles of the secretory pathway is consistent with a major role for this pathway in the efflux of F-DDP and DDP from the cell.

Address: Department of Medicine, and the Rebecca and John Moores Cancer Center, University of California-San Diego, San Diego, CA 92093, USA. [email protected]

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MeSH Terms: Adenosine Triphosphatases, Androstadienes, Antineoplastic Agents, Biological Transport, Brefeldin A, Cation Transport Proteins, Cell Nucleus, Cisplatin, Contrast Media, Copper, Copper-Transporting ATPases, Cytoplasm, Female, Fluorescein, Golgi Apparatus, Humans, Isoquinolines, Lysosomes, Microscopy, Confocal, Microscopy, Fluorescence, Ovarian Neoplasms, Protein Kinase Inhibitors, Protein Synthesis Inhibitors, Recombinant Fusion Proteins, Subcellular Fractions, Sulfonamides, Tumor Cells, Cultured, Wortmannin