Translocation of full-length or fragments of receptors to the nucleus has been reported for several tyrosine kinase receptors. In this paper, we show that a fraction of full-length cell surface platelet-derived growth factor (PDGF) receptor &bgr; (PDGFR&bgr;) accumulates in the nucleus at the chromatin and the nuclear matrix after ligand stimulation. Nuclear translocation of PDGFR&bgr; was dependent on PDGF-BB–induced receptor dimerization, clathrin-mediated endocytosis, &bgr;-importin, and intact Golgi, occurring in both normal and cancer cells. In the nucleus, PDGFR&bgr; formed ligand-inducible complexes with the tyrosine kinase Fer and its substrate, TATA element–modifying factor 1 (TMF-1). PDGF-BB stimulation decreased TMF-1 binding to the transcriptional regulator Brahma-related gene 1 (Brg-1) and released Brg-1 from the SWI–SNF chromatin remodeling complex. Moreover, knockdown of TMF-1 by small interfering RNA decreased nuclear translocation of PDGFR&bgr; and caused significant up-regulation of the Brg-1/p53-regulated cell cycle inhibitor CDKN1A (encoding p21) without affecting PDGFR&bgr;-inducible immediate-early genes. In conclusion, nuclear interactions of PDGFR&bgr; control proliferation by chromatin remodeling and regulation of p21 levels.
PDGFRβ translocates to the nucleus and regulates chromatin remodeling via TATA element–modifying factor 1
Natalia Papadopoulos,J. Lennartsson,C. Heldin
Published 2018 in Journal of Cell Biology
ABSTRACT
PUBLICATION RECORD
- Publication year
2018
- Venue
Journal of Cell Biology
- Publication date
2018-05-07
- Fields of study
Biology, Medicine
- Identifiers
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- Source metadata
Semantic Scholar, PubMed
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