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BRCA1-IRIS Promotes Human Tumor Progression Through PTEN Blockade and HIF-1α Activation

BRCA1-IRIS Promotes Human Tumor Progression Through PTEN Blockade and HIF-1α Activation

Andrew G Li, Elizabeth C Murphy, Aedin C Culhane, Emily Powell, Hua Wang, Roderick T Bronson, Thanh Von, Anita Giobbie-Hurder, Rebecca S Gelman, Kimberly J Briggs, Helen Piwnica-Worms, Jean J Zhao, Andrew L Kung, etc.

Proc Natl Acad Sci U S A. 2018 Oct 9;115(41):E9600-E9609.

PMID: 30254159

Abstract:

BRCA1 is an established breast and ovarian tumor suppressor gene that encodes multiple protein products whose individual contributions to human cancer suppression are poorly understood. BRCA1-IRIS (also known as "IRIS"), an alternatively spliced BRCA1 product and a chromatin-bound replication and transcription regulator, is overexpressed in various primary human cancers, including breast cancer, lung cancer, acute myeloid leukemia, and certain other carcinomas. Its naturally occurring overexpression can promote the metastasis of patient-derived xenograft (PDX) cells and other human cancer cells in mouse models. The IRIS-driven metastatic mechanism results from IRIS-dependent suppression of phosphatase and tensin homolog (PTEN) transcription, which in turn perturbs the PI3K/AKT/GSK-3β pathway leading to prolyl hydroxylase-independent HIF-1α stabilization and activation in a normoxic environment. Thus, despite the tumor-suppressing genetic origin of IRIS, its properties more closely resemble those of an oncoprotein that, when spontaneously overexpressed, can, paradoxically, drive human tumor progression.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR4247097	PTEN human			Price

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