TIPs are tension-responsive proteins involved in myogenic versus adipogenic differentiation - PubMed (original) (raw)
TIPs are tension-responsive proteins involved in myogenic versus adipogenic differentiation
Sandhya Jakkaraju et al. Dev Cell. 2005 Jul.
Free article
Abstract
Stretch induces lung embryonic mesenchymal cells to follow a myogenic pathway. Using this system we identified a set of stretch-responsive factors, which we referred to as TIPs (tension-induced/inhibited proteins). TIPs displayed signature motifs characteristic of nuclear receptor coregulators and chromatin remodeling enzymes. A genomic BLAST search suggested that the three TIPs identified were isoforms originated by alternative splicing from a single gene. Functional studies revealed that TIP-1 and TIP-3 were involved in the cell's selection of the myogenic or the adipogenic pathway. TIP-1, induced by stretch, promoted myogenesis, while TIP-3, inhibited by stretch, stimulated adipogenesis. The selection involved TIP-mediated chromatin remodeling via a histone acetylation process and depended on TIP-1 and TIP-3 nuclear receptor binding boxes (NRBs). This study, therefore, suggests a new developmental mechanism linking the presence or absence of tension with divergent differentiation pathways.
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