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. 2019 Apr;568(7753):557-560.
doi: 10.1038/s41586-019-1112-8. Epub 2019 Apr 10.

p38γ is essential for cell cycle progression and liver tumorigenesis

Antonia Tomás-Loba  1 , Elisa Manieri #  1   2 , Bárbara González-Terán #  1 , Alfonso Mora  1 , Luis Leiva-Vega  1 , Ayelén M Santamans  1 , Rafael Romero-Becerra  1 , Elena Rodríguez  1 , Aránzazu Pintor-Chocano  1 , Ferran Feixas  3 , Juan Antonio López  1 , Beatriz Caballero  1 , Marianna Trakala  4 , Óscar Blanco  5 , Jorge L Torres  5 , Lourdes Hernández-Cosido  5 , Valle Montalvo-Romeral  1 , Nuria Matesanz  1 , Marta Roche-Molina  1 , Juan Antonio Bernal  1 , Hannah Mischo  6 , Marta León  1 , Ainoa Caballero  1 , Diego Miranda-Saavedra  7   8 , Jesús Ruiz-Cabello  1   9   10   11   12 , Yulia A Nevzorova  13   12 , Francisco Javier Cubero  14   15 , Jerónimo Bravo  16 , Jesús Vázquez  1   17 , Marcos Malumbres  4 , Miguel Marcos  5 , Sílvia Osuna  3   18 , Guadalupe Sabio  19
Affiliations

p38γ is essential for cell cycle progression and liver tumorigenesis

Antonia Tomás-Loba et al. Nature. 2019 Apr.

Abstract

The cell cycle is a tightly regulated process that is controlled by the conserved cyclin-dependent kinase (CDK)-cyclin protein complex1. However, control of the G0-to-G1 transition is not completely understood. Here we demonstrate that p38 MAPK gamma (p38γ) acts as a CDK-like kinase and thus cooperates with CDKs, regulating entry into the cell cycle. p38γ shares high sequence homology, inhibition sensitivity and substrate specificity with CDK family members. In mouse hepatocytes, p38γ induces proliferation after partial hepatectomy by promoting the phosphorylation of retinoblastoma tumour suppressor protein at known CDK target residues. Lack of p38γ or treatment with the p38γ inhibitor pirfenidone protects against the chemically induced formation of liver tumours. Furthermore, biopsies of human hepatocellular carcinoma show high expression of p38γ, suggesting that p38γ could be a therapeutic target in the treatment of this disease.

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