Control of the Osteoblast Lineage by Mitogen-Activated Protein Kinase Signaling

Overview

Journal Curr Mol Biol Rep

Specialty Biochemistry

Date 2017 Oct 24

PMID 29057206

Citations 27

Authors

Renny T Franceschi

Chunxi Ge

Affiliations

Soon will be listed here.

Abstract

Purpose Of The Review: This review will provide a timely assessment of MAP kinase actions in bone development and homeostasis with particular emphasis on transcriptional control of the osteoblast lineage.

Recent Findings: ERK and p38 MAP kinases function as transducers of signals initiated by the extracellular matrix, mechanical loading, TGF-β, BMPs and FGF2. MAPK signals may also affect and/or interact with other important pathways such as WNT and HIPPO. ERK and p38 MAP kinase pathways phosphorylate specific osteogenic transcription factors including RUNX2, Osterix, ATF4 and DLX5. For RUNX2, phosphorylation at specific serine residues initiates epigenetic changes in chromatin necessary for decondensation and increased transcription. MAPK also suppresses marrow adipogenesis by phosphorylating and inhibiting PPARγ, which may explain the well-known relationship between reduced skeletal loading and marrow fat accumulation.

Summary: MAPKs transduce signals from the extracellular environment to the nucleus allowing bone cells to respond to changes in hormonal/growth factor signaling and mechanical loading thereby optimizing bone structure to meet physiological and mechanical needs of the body.

Citing Articles

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Ge C, Li Y, Wu F, Ma P, Franceschi R Acta Biomater. 2023; 166:109-118.

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Betaine promotes osteogenic differentiation in immortalized human dental pulp-derived cells.

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