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P53 activation suppresses irinotecan metabolite SN-38-induced cell damage in non-malignant but not malignant epithelial colonic cells

journal contribution
posted on 21.07.2021, 03:36 by Bavani Gunasegaran, Paul NeilsenPaul Neilsen, Scott D Smid
Nutlin-3a is a p53 activator and potential cyclotherapy approach that may also mitigate side effects of chemotherapeutic drugs in the treatment of colorectal cancer. We investigated cell proliferation in a panel of colorectal cancer (CRC) cell lines with wild-type or mutant p53, as well as a non-tumorigenic fetal intestinal cell line following Nutlin-3a treatment (10 μM). We then assessed apoptosis at 24 and 48 h following administration of the active irinotecan metabolite, SN-38 (0.001 μM - 1 μM), alone or following pre-treatment with Nutlin-3a (10 μM). Nutlin-3a treatment (10 μM) significantly reduced proliferation in wild-type p53 expressing cell lines (FHS 74 and HCT116+/+) at 72 and 96 h, but was without effect in cell lines with mutated or deleted p53 (Caco-2, SW480, and HCT 116−/−). SN-38 treatment induced significant apoptosis in all cell lines after 48 h. Nutlin-3a unexpectedly increased cell death in the p53 wild-type CRC cell line, HCT116+/+, while Nutlin-3a pre-treatment provided protection from SN-38 in the p53 wild-type normal cell line, FHs 74. These results demonstrate Nutlin-3a's selective growth-arresting efficacy in p53 wild-type non-malignant intestinal cell lines, enabling the selective targeting of malignant cells with chemotherapy drugs. These studies highlight the potential of Nutlin-3a to minimise intestinal mucosal damage following chemotherapy.

Funding

Category 3 - Industry and Other Research Income

History

Volume

67

Start Page

1

End Page

7

Number of Pages

7

eISSN

1879-3177

ISSN

0887-2333

Location

England

Publisher

Elsevier

Language

eng

Peer Reviewed

Yes

Open Access

No

Acceptance Date

30/05/2020

External Author Affiliations

University of Adelaide

Era Eligible

Yes

Medium

Print-Electronic

Journal

Toxicology in Vitro

Article Number

104908