Abstract：
:Cell-cell junctions respond to mechanical forces by changing their organization and function. To gain insight into the mechanochemical basis underlying junction mechanosensitivity, we analyzed tight junction (TJ) formation between the enveloping cell layer (EVL) and the yolk syncytial layer (YSL) in the gastrulating zebrafish embryo. We found that the accumulation of Zonula Occludens-1 (ZO-1) at TJs closely scales with tension of the adjacent actomyosin network, revealing that these junctions are mechanosensitive. Actomyosin tension triggers ZO-1 junctional accumulation by driving retrograde actomyosin flow within the YSL, which transports non-junctional ZO-1 clusters toward the TJ. Non-junctional ZO-1 clusters form by phase separation, and direct actin binding of ZO-1 is required for stable incorporation of retrogradely flowing ZO-1 clusters into TJs. If the formation and/or junctional incorporation of ZO-1 clusters is impaired, then TJs lose their mechanosensitivity, and consequently, EVL-YSL movement is delayed. Thus, phase separation and flow of non-junctional ZO-1 confer mechanosensitivity to TJs.
journal_name
Celljournal_title
Cellauthors
Schwayer C,Shamipour S,Pranjic-Ferscha K,Schauer A,Balda M,Tada M,Matter K,Heisenberg CPdoi
10.1016/j.cell.2019.10.006subject
Has Abstractpub_date
2019-10-31 00:00:00pages
937-952.e18issue
4eissn
0092-8674issn
1097-4172pii
S0092-8674(19)31122-5journal_volume
179pub_type
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