Novel ovarian cancer maintenance therapy targeted at mortalin and mutant p53.

Abstract:

:Current ovarian cancer maintenance therapy is limited by toxicity and no proven impact on overall survival. To study a maintenance strategy targeted at missense mutant p53, we hypothesized that the release of mutant p53 from mortalin inhibition by the SHetA2 drug combined with reactivation of mutant p53 with the PRIMA-1MET drug inhibits growth and tumor establishment synergistically in a mutant-p53 dependent manner. The Cancer Genome Atlas (TCGA) data and serous ovarian tumors were evaluated for TP53 and HSPA9/mortalin status. SHetA2 and PRIMA-1MET were tested in ovarian cancer cell lines and fallopian tube secretory epithelial cells using isobolograms, fluorescent cytometry, Western blots and ELISAs. Drugs were administered to mice after peritoneal injection of MESOV mutant p53 ovarian cancer cells and prior to tumor establishment, which was evaluated by logistic regression. Fifty-eight percent of TP53 mutations were missense and there were no mortalin mutations in TCGA high-grade serous ovarian cancers. Mortalin levels were sequentially increased in serous benign, borderline and carcinoma tumors. SHetA2 caused p53 nuclear and mitochondrial accumulation in cancer, but not in healthy, cells. Endogenous or exogenous mutant p53 increased SHetA2 resistance. PRIMA-1MET decreased this resistance and interacted synergistically with SHetA2 in mutant and wild type p53-expressing cell lines in association with elevated reactive oxygen species/ATP ratios. Tumor-free rates in animals were 0% (controls), 25% (PRIMA1MET ), 42% (SHetA2) and 67% (combination). SHetA2 (p = 0.004) and PRIMA1MET (p = 0.048) functioned additively in preventing tumor development with no observed toxicity. These results justify the development of SHetA2 and PRIMA-1MET alone and in combination for ovarian cancer maintenance therapy.

journal_name

Int J Cancer

authors

Ramraj SK,Elayapillai SP,Pelikan RC,Zhao YD,Isingizwe ZR,Kennedy AL,Lightfoot SA,Benbrook DM

doi

10.1002/ijc.32830

subject

Has Abstract

pub_date

2020-08-15 00:00:00

pages

1086-1097

issue

4

eissn

0020-7136

issn

1097-0215

journal_volume

147

pub_type

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