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The influence of tumour microenvironmental factors on the efficacy of cisplatin and novel platinum(IV) complexes.

Abstract：

:The chemotherapeutic drug cisplatin is an important treatment for many types of solid tumours, in particular non-small cell lung cancer (NSCLC). Platinum(IV) complexes offer several advantages to cisplatin due to their requirement for reduction to the active platinum(II) form to elicit cytotoxicity. This should minimise non-specific effects and facilitate higher amounts of the active complexes reaching the target DNA. Hypoxia and a quiescent cell population are features of the tumour microenvironment known to lead to resistance to many chemotherapeutic agents. It is unclear how these microenvironmental factors will impact on the efficacy of novel platinum(IV) complexes. Consequently, the cytotoxicities of several platinum drugs were determined in monolayer and tumour spheroid cultures derived from NSCLC lines. Platinum(IV) reduction potential correlated well with cytotoxicity. The complex containing a chloro axial ligand demonstrated the greatest potency and the drug with the hydroxy ligand was the least effective. Although drug cytotoxicity was not enhanced under hypoxic conditions, both cisplatin and the platinum(IV) complexes retained full potency. In addition, all of the platinum drugs retained the ability to evoke apoptosis in quiescent cells. In summary, unlike many anticancer drugs, the platinum(IV) complexes retain cytotoxic potency under resistance-inducing tumour microenvironmental conditions and warrant further investigation as more selective alternatives to current platinum-based therapy for the treatment of solid tumours.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Mellor HR,Snelling S,Hall MD,Modok S,Jaffar M,Hambley TW,Callaghan R

doi

10.1016/j.bcp.2005.07.016

subject

Has Abstract

pub_date

2005-10-15 00:00:00

pages

1137-46

issue

8

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(05)00488-0

journal_volume

70

pub_type

杂志文章

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