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Biochem Biophys Res Commun. 2015 Aug 7;463(4):551-6. doi: 10.1016/j.bbrc.2015.05.083. Epub 2015 Jun 3.

The PARP1 inhibitor BMN 673 exhibits immunoregulatory effects in a Brca1(-/-) murine model of ovarian cancer.

Author information

1
Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA, USA; Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China.
2
Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA, USA.
3
Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA, USA; Department of Regenerative Medicine, School of Pharmaceutical Sciences, Jilin University, Changchun, China.
4
Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA, USA; Department of Radiation Oncology, Massachusetts General Hospital, Boston, MA, USA.
5
Department of Pathology, Johns Hopkins University, Baltimore, MD, USA.
6
Women's Cancer Program, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
7
Gynecologic Oncology Program, Dana-Farber Cancer Institute, Boston, MA, USA.
8
Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA, USA. Electronic address: michael_goldberg1@dfci.harvard.edu.

Abstract

Familial breast and ovarian cancer are often caused by inherited mutations of BRCA1. While current prognoses for such patients are rather poor, inhibition of poly-ADP ribose polymerase 1 (PARP1) induces synthetic lethality in cells that are defective in homologous recombination. BMN 673 is a potent PARP1 inhibitor that is being clinically evaluated for treatment of BRCA-mutant cancers. Using the Brca1-deficient murine epithelial ovarian cancer cell line BR5FVB1-Akt, we investigated whether the antitumor effects of BMN 673 extend beyond its known pro-apoptotic function. Administration of modest amounts of BMN 673 greatly improved the survival of mice bearing subcutaneous or intraperitoneal tumors. We thus hypothesized that BMN 673 may influence the composition and function of immune cells in the tumor microenvironment. Indeed, BMN 673 significantly increases the number of peritoneal CD8(+) T cells and NK cells as well as their production of IFN-γ and TNF-α. These data suggest that the cell stress caused by BMN 673 induces not only cancer cell-intrinsic apoptosis but also cancer cell-extrinsic antitumor immune effects in a syngeneic murine model of ovarian cancer. BMN 673 may therefore serve as a promising adjuvant therapy to immunotherapy to achieve durable responses among patients whose tumors harbor defects in homologous recombination.

KEYWORDS:

BMN 673; Immune microenvironment; Ovarian cancer; PARP1

PMID:
26047697
DOI:
10.1016/j.bbrc.2015.05.083
[Indexed for MEDLINE]

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