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Copper transporter 1 in human colorectal cancer cell lines: Effects of endogenous and modified expression on oxaliplatin cytotoxicity

journal contribution
posted on 2023-05-19, 04:05 authored by Cui, H, Zhang, J, McKeage, MJ, Louise NottLouise Nott, Dominic GeraghtyDominic Geraghty, Nuri GuvenNuri Guven, Liu, JJ
Oxaliplatin-based chemotherapy is the mainstay for the treatment of advanced colorectal cancer. Copper transporter proteins have been implicated in the transport of platinum-based anticancer drugs, but their expression in human colorectal cancer cell lines and roles in controlling their sensitivity to oxaliplatin are not well studied or understood. The endogenous and modified expression of copper uptake transporter 1 (hCTR1) was studied in a panel of human colorectal cancer cell lines (DLD-1, SW620, HCT-15 and COLO205) with ~20-fold variation in oxaliplatin sensitivity. hCTR1 protein was expressed more abundantly than ATP7A and ATP7B proteins, but with broadly similar levels and patterns of expression across four colorectal cancer cell lines. In a colorectal cancer cell-line background (DLD-1), stable transfection of the hCtr1 gene enhanced hCTR1 protein expression and increased the sensitivity of the cells to the cytotoxicity of copper and oxaliplatin. Treatment with copper chelators (ammonium tetrathiomolybdate, bathocuproinedisulfonic acid and D-penicillamine) increased expression of hCTR1 protein in DLD-1 and SW620 cells, and potentiated the cytotoxicity of oxaliplatin in DLD-1 but not SW620 cells. Treatment with copper chloride altered neither the expression of copper transporters nor cytotoxicity of oxaliplatin in colorectal cancer lines. In conclusion, human colorectal cancer cell lines consistently express hCTR1 protein despite their variable sensitivity to oxaliplatin. Genetic or pharmacological modification of hCTR1 protein expression may potentiate oxaliplatin sensitivity in some but not all colorectal cancer cell lines.

Funding

Royal Hobart Hospital Research Foundation

History

Publication title

Journal of Inorganic Biochemistry

Volume

177

Pagination

249-258

ISSN

0162-0134

Department/School

Tasmanian School of Medicine

Publisher

Elsevier

Place of publication

360 Park Ave South, New York, USA, Ny, 10010-1710

Rights statement

Copyright 2017 Elsevier Inc.

Repository Status

  • Restricted

Socio-economic Objectives

Clinical health not elsewhere classified

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