Tumour regression in a ligand inducible manner mediated by a chimeric tumour suppressor derived from p53.

Abstract:

:The p53 tumour suppressor induces cell cycle arrest and apoptosis in response to cellular stresses. p53 is inactivated by various cellular and viral factors. We set out to generate regulatable p53 derivatives that are highly inducible by synthetic ligands, escape inactivation and efficiently induce apoptosis. We have generated Ligand Inducible Chimeric Tumour Suppressors (LI-CTS), that are inactive unless provided with artificial ligands. They are resistant to inactivation, due to the replacement of domains that mediate p53 inhibition by heterologous sequences. LI-CTS are activated by micromolar concentrations of ligand in a variety of cell lines. Following ligand addition, they translocate to the nucleus, activate p53 inducible genes and induce apoptosis. We have established human head and neck squamous cell carcinoma lines that stably express LI-CTS, which are inducible. These lines form tumours in nude mice in the absence of ligand. Addition of ligand inhibits tumour formation, and moreover, regresses established tumours by apoptosis. Although regulatable p53 expression has been achieved previously, our study provides the first demonstration of regulatable in vivo regression of tumours in a p53 based approach. Regulated inhibition and regression of tumours with a ligand inducible chimeric tumour suppressor could provide a novel approach to p53 based gene therapy.

journal_name

Oncogene

journal_title

Oncogene

authors

Sengupta S,Ralhan R,Wasylyk B

doi

10.1038/sj.onc.1203256

subject

Has Abstract

pub_date

2000-01-20 00:00:00

pages

337-50

issue

3

eissn

0950-9232

issn

1476-5594

journal_volume

19

pub_type

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