Dataset Information

Starvation promotes REV1 SUMOylation and p53-dependent sensitization of melanoma and breast cancer cells.

ABSTRACT: Short-term starvation or fasting can augment cancer treatment efficacy and can be effective in delaying cancer progression in the absence of chemotherapy, but the underlying molecular mechanisms of action remain elusive. Here, we describe the role of REV1, a specialized DNA polymerase involved in DNA repair, as an important signaling node linking nutrient sensing and metabolic control to cell fate. We show that REV1 is a novel binding partner of the tumor suppressor p53 and regulates its activity. Under starvation, REV1 is modified by SUMO2/3, resulting in the relief of REV1's inhibition of p53 and enhancing p53's effects on proapoptotic gene expression and apoptosis in breast cancer and melanoma cells. Thus, fasting in part through its effect on REV1 is a promising nontoxic strategy to increase p53-dependent cell death and to enhance the efficacy of cancer therapies.

SUBMITTER: Shim HS

PROVIDER: S-EPMC4359966 | biostudies-literature | 2015 Mar

REPOSITORIES: biostudies-literature

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Starvation promotes REV1 SUMOylation and p53-dependent sensitization of melanoma and breast cancer cells.

Shim Hong Seok HS Wei Min M Brandhorst Sebastian S Longo Valter D VD

Cancer research 20150122 6

Short-term starvation or fasting can augment cancer treatment efficacy and can be effective in delaying cancer progression in the absence of chemotherapy, but the underlying molecular mechanisms of action remain elusive. Here, we describe the role of REV1, a specialized DNA polymerase involved in DNA repair, as an important signaling node linking nutrient sensing and metabolic control to cell fate. We show that REV1 is a novel binding partner of the tumor suppressor p53 and regulates its activit ...[more]

PMID: 25614517

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Project description:Prior studies implicate type 1 IGF receptor (IGF-1R) in mediating chemo-resistance. Here, we investigated whether IGF-1R influences response to temozolomide (TMZ), which generates DNA adducts that are removed by O6-methylguanine-DNA methyltransferase (MGMT), or persist causing replication-associated double-strand breaks (DSBs). Initial assessment in 10 melanoma cell lines revealed that TMZ resistance correlated with MGMT expression (r = 0.79, p = 0.009), and in MGMT-proficient cell lines, with phospho-IGF-1R (r = 0.81, p = 0.038), suggesting that TMZ resistance associates with IGF-1R activation. Next, effects of IGF-1R inhibitors (IGF-1Ri) AZ3801 and linsitinib (OSI-906) were tested on TMZ-sensitivity, cell cycle progression and DSB induction. IGF-1Ri sensitized BRAF wild-type and mutant melanoma cells to TMZ in vitro, an effect that was independent of MGMT. Cells harboring wild-type p53 were more sensitive to IGF-1Ri, and showed schedule-dependent chemo-sensitization that was most effective when IGF-1Ri followed TMZ. This sequence sensitized to clinically-achievable TMZ concentrations and enhanced TMZ-induced apoptosis. Simultaneous or prior IGF-1Ri caused less effective chemo-sensitization, associated with increased G1 population and reduced accumulation of TMZ-induced DSBs. Clinically relevant sequential (TMZ ? IGF-1Ri) treatment was tested in mice bearing A375M (V600E BRAF, wild-type p53) melanoma xenografts, achieving peak plasma/tumor IGF-1Ri levels comparable to clinical Cmax, and inducing extensive intratumoral apoptosis. TMZ or IGF-1Ri caused minor inhibition of tumor growth (gradient reduction 13%, 25% respectively), while combination treatment caused supra-additive growth delay (72%) that was significantly different from control (p < 0.01), TMZ (p < 0.01) and IGF-1Ri (p < 0.05) groups. These data highlight the importance of scheduling when combining IGF-1Ri and other targeted agents with drugs that induce replication-associated DNA damage.

Dataset Information

Starvation promotes REV1 SUMOylation and p53-dependent sensitization of melanoma and breast cancer cells.

Publications

Starvation promotes REV1 SUMOylation and p53-dependent sensitization of melanoma and breast cancer cells.

Similar Datasets

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