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

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Merkel cell polyomavirus Human alphaherpesvirus 2 Betapolyomavirus hominis Human alphaherpesvirus 1 Cytomegalovirus Lymphocryptovirus JC polyomavirus Betapolyomavirus macacae Homo sapiens Human immunodeficiency virus 1 Rhadinovirus

PROVIDER: GSE117748 | GEO | 2019/03/04

REPOSITORIES: GEO

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MicroRNA-Mediated Suppression of the TGF-β Pathway Confers Transmissible and Reversible CDK4/6 Inhibitor Resistance.

Project description:CDK4/6 inhibition is now part of the standard armamentarium for patients with estrogen receptor-positive (ER+) 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 palbociclib treatment in ER+ breast cancer cells. CDK6 expression is critical for cellular survival during palbociclib exposure. The increased CDK6 expression observed in resistant cells is dependent on TGF-β pathway suppression via miR-432-5p expression. Exosomal miR-432-5p expression mediates the transfer of the resistance phenotype between neighboring cell populations. Levels of miR-432-5p are higher in primary breast cancers demonstrating CDK4/6 resistance compared to those that are sensitive. These data are further confirmed in pre-treatment and post-progression biopsies from a parotid cancer patient who had responded to ribociclib, demonstrating the clinical relevance of this mechanism. Finally, the CDK4/6 inhibitor resistance phenotype is reversible in vitro and in vivo by a prolonged drug holiday.

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

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