Cyclophilin A as a target of Cisplatin chemosensitizers.

Abstract:

:Platinum-based chemotherapeutics are the mainstay of treatment of a range of tumors achieving high response rates but limited in the course of disease by appearance of drug resistance. Tumor cells respond with reduced uptake and increased intracellular inactivation of the drugs, as well as increased DNA repair and general resistance to chemotherapyinduced cell death. Cisplatin is known to induce expression of cyclophilins, a group of proteins that have peptidyl-prolyl cis-trans isomerase (PPIase) and molecular chaperone activities, as stress response. Cyclophilin A (CypA) and other members of this family are inhibited by cyclosporin A (CsA) which sensitized diverse drug-resistant tumor cell lines in vitro to cisplatin. This effect of CsA was attributed to metabolic changes, inhibition of DNA repair, enhancement of apoptosis, altered intracellular signal transduction or increased production of reactive oxygen species (ROS), although no definitive explanation was provided so far. Several clinical trials employing cisplatin/carboplatin in combination with CsA yielded unsatisfactory results. Since viral replication was found to be dependent on cyclophilins of the host cells, effective new inhibitors, different from CsA or with low or absent immunosuppressive activity, are in development or clinical trials. Sanglifehrins are more potent than CsA and proved to increase toxicity of cisplatin against hepatocellular cancer cells in vitro. These novel cyclophilin inhibitors may offer new opportunities to achieve reversal of resistance to platinumbased drugs in refractory patients. Responsive cancer patients may be enriched in clinical trials by an identification of the downstream targets of Cyps responsible for chemoresistance.

authors

Hamilton G

doi

10.2174/15680096113136660109

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

46-58

issue

1

eissn

1568-0096

issn

1873-5576

pii

CCDT-EPUB-57194

journal_volume

14

pub_type

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