Recurrent activating mutations of PPAR gamma associated with luminal bladder tumors.Rochel, N., Krucker, C., Coutos-Thevenot, L., Osz, J., Zhang, R., Guyon, E., Zita, W., Vanthong, S., Hernandez, O.A., Bourguet, M., Badawy, K.A., Dufour, F., Peluso-Iltis, C., Heckler-Beji, S., Dejaegere, A., Kamoun, A., de Reynies, A., Neuzillet, Y., Rebouissou, S., Beraud, C., Lang, H., Massfelder, T., Allory, Y., Cianferani, S., Stote, R.H., Radvanyi, F., Bernard-Pierrot, I.
(2019) Nat Commun 10: 253-253
- PubMed: 30651555
- DOI: 10.1038/s41467-018-08157-y
- Primary Citation of Related Structures:
- PubMed Abstract:
The upregulation of PPARγ/RXRα transcriptional activity has emerged as a key event in luminal bladder tumors. It renders tumor cell growth PPARγ-dependent and modulates the tumor microenvironment to favor escape from immuno-surveillance. The activati ...
The upregulation of PPARγ/RXRα transcriptional activity has emerged as a key event in luminal bladder tumors. It renders tumor cell growth PPARγ-dependent and modulates the tumor microenvironment to favor escape from immuno-surveillance. The activation of the pathway has been linked to PPARG gains/amplifications resulting in PPARγ overexpression and to recurrent activating point mutations of RXRα. Here, we report recurrent mutations of PPARγ that also activate the PPARγ/RXRα pathway, conferring PPARγ-dependency and supporting a crucial role of PPARγ in luminal bladder cancer. These mutations are found throughout the protein-including N-terminal, DNA-binding and ligand-binding domains-and most of them enhance protein activity. Structure-function studies of PPARγ variants with mutations in the ligand-binding domain allow identifying structural elements that underpin their gain-of-function. Our study reveals genomic alterations of PPARG that lead to pro-tumorigenic PPARγ/RXRα pathway activation in luminal bladder tumors and may open the way towards alternative options for treatment.
Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de La Santé et de La Recherche Médicale (INSERM), U1258/Centre National de Recherche Scientifique (CNRS), UMR7104/Université de Strasbourg, 67404 Illkirch, France. firstname.lastname@example.org.