ERK activation and αvβ3 integrin signaling through Shc recruitment in response to mechanical stimulation in human osteoblasts

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Abstract
Osteoblast growth and differentiation are critical processes for bone development and maintenance, and are regulated by both humoral and mechanical factors. Humoral (hormonal) factors can affect gene transcription via MAPkinases, e.g., extracellular signal-regulated kinase (ERK). We studied whether the ERK pathway is also involved in processing mechanical inputs in human bone cells. Exposing MG63 cells to physiologically relevant levels of fluid flow resulted in ERK phosphorylation. Genistein blocked this response, indicating that it is dependent on tyrosine phosphorylation. Furthermore, αvβ3 integrins were activated in response to fluid flow, as shown by recruitment of adaptor molecule Shc and clustering of αvβ3 in focal adhesion-like structures. Antibodies blocking formation of β1 or β3 integrin-matrix interactions or RGD peptides could not inhibit fluid flow-induced ERK phosphorylation, suggesting that formation of new integrin-matrix interactions is not essential for this response and that other upstream mechanosensors regulate induction of ERK phosphorylation in response to fluid flow in human bone cells. J. Cell. Biochem. 87: 85–92, 2002.

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