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Mechanotransduction and intracellular signaling mechanisms of stretch-induced remodeling in endothelial cells.

Abstract：

:We investigated the signaling mechanism of stretch-induced cell remodeling in human umbilical vein endothelial cells (HUVECs). Freshly dissociated HUVECs were cultured on an elastic silicon membrane and subjected to uniaxial cyclic stretch (20% in length, 1 Hz). The cells started to change their morphology as early as 15 min after stretch onset, and most cells eventually aligned perpendicularly to the stretch axis within 1 h. This remodeling was dependent on the increase in intracellular calcium concentration ([Ca2+]i) via a Ca(2+)-permeable stretch-activated (SA) channel. During the process of remodeling, extensive rearrangement of stress fibers and focal adhesions was observed, which may be close to the final step in the intracellular signaling cascade. This event was [Ca2+]i-dependent, suggesting the existence of a Ca(2+)-dependent intermediate cascade that links [Ca2+]i to the rearrangement of cytoskeletons and focal adhesions. We found that some proteins, including pp125FAK (focal adhesion kinase) and paxillin, were tyrosine phosphorylated during cyclic stretch in a Ca(2+)-dependent manner. Inhibition of this tyrosine phosphorylation prohibited the stretch-dependent rearrangement of cytoskeletons and focal adhesions as well as the remodeling. Finally the tyrosine kinase src, which could phosphorylate pp125FAK, was found to be activated in a [Ca2+]i-dependent way during stretch. All of the above molecular events were consistently Ca(2+)-dependent, which led us to propose the signaling cascade: SA channel activation-->[Ca2+]i increase-->src activation-->protein tyrosine phosphorylation-->rearrangement of cytoskeletons and focal adhesions-->cell remodeling.

journal_name

Heart Vessels

journal_title

Heart and vessels

authors

Sokabe M,Naruse K,Sai S,Yamada T,Kawakami K,Inoue M,Murase K,Miyazu M

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

191-3

eissn

0910-8327

issn

1615-2573

journal_volume

Suppl 12

pub_type

杂志文章

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