Iron regulatory protein 2 is a suppressor of mutant p53 in tumorigenesis.

Abstract:

:p53 is known to play a role in iron homeostasis and is required for FDXR-mediated iron metabolism via iron regulatory protein 2 (IRP2). Interestingly, p53 is frequently mutated in tumors wherein iron is often accumulated, suggesting that mutant p53 may exert its gain of function by altering iron metabolism. In this study, we found that FDXR deficiency decreased mutant p53 expression along with altered iron metabolism in p53R270H/- MEFs and cancer cells carrying mutant p53. Consistently, we found that decreased expression of mutant p53 by FDXR deficiency inhibited mutant p53-R270H to induce carcinoma and high grade pleomorphic sarcoma in FDXR+/-; p53R270H/- mice as compared with p53R270H/- mice. Moreover, we found that like its effect on wild-type p53, loss of IRP2 increased mutant p53 expression. However, unlike its effect to suppress cell growth in cells carrying wild-type p53, loss of IRP2 promoted cell growth in cancer cells expressing mutant p53. Finally, we found that ectopic expression of IRP2 suppressed cell growth in a mutant p53-dependent manner. Together, our data indicate that mutant p53 gain-of-function can be suppressed by IRP2 and FDXR deficiency, both of which may be explored to target tumors carrying mutant p53.

journal_name

Oncogene

journal_title

Oncogene

authors

Zhang Y,Feng X,Zhang J,Chen M,Huang E,Chen X

doi

10.1038/s41388-019-0876-5

subject

Has Abstract

pub_date

2019-08-01 00:00:00

pages

6256-6269

issue

35

eissn

0950-9232

issn

1476-5594

pii

10.1038/s41388-019-0876-5

journal_volume

38

pub_type

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