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MicroRNA-mediated suppression of the TGF-β pathway confers transmissible and reversible CDK4/6 inhibitor resistance (array II)

ABSTRACT: MicroRNA-mediated suppression of the TGF-β pathway confers transmissible and reversible CDK4/6 inhibitor resistance (array II)

PROVIDER: PRJNA483060 | ENA |

REPOSITORIES: ENA

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MicroRNA-mediated suppression of the TGF-β pathway confers transmissible and reversible CDK4/6 inhibitor resistance

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MicroRNA-mediated suppression of the TGF-β pathway confers transmissible and reversible CDK4/6 inhibitor resistance (miRNA-Seq)

Project description:CDK4/6 inhibition is now part of the standard armamentarium for patients with estrogen receptor (ER)-positive breast cancer, so that defining mechanisms of resistance is a pressing issue. Here, we identify increased CDK6 expression as a key determinant of acquired resistance after exposure to palbociclib in ER-positive breast cancer cells. Increased CDK6 in resistant cells was dependent on TGF-β pathway suppression via miR-432-5p expression. Exosomal miR-432-5p expression mediated transfer of the resistance phenotype between neighboring cell populations. We confirmed these data in pre-treatment and post-progression biopsies from a parotid cancer patient who had responded to ribociclib, demonstrating clinical relevance of this mechanism. Additionally, the CDK4/6 inhibitor resistance phenotype can be reversed in vitro and in vivo by a prolonged drug holiday.

2019-03-04 | GSE117747 | GEO