Sensing Actin Dynamics through Adherens Junctions.

Indrajyoti Indra, Regina B Troyanovsky, Lawrence Shapiro, Barry Honig, Sergey M Troyanovsky

Cell reports 2020 Feb 25

filter terms:

We study punctate adherens junctions (pAJs) to determine how short-lived cadherin clusters and relatively stable actin bundles interact despite differences in dynamics. We show that pAJ-linked bundles consist of two distinct regions-the bundle stalk (AJ-BS) and a tip (AJ-BT) positioned between cadherin clusters and the stalk. The tip differs from the stalk in a number of ways: it is devoid of the actin-bundling protein calponin, and exhibits a much faster F-actin turnover rate. While F-actin in the stalk displays centripetal movement, the F-actin in the tip is immobile. The F-actin turnover in both the tip and stalk is dependent on cadherin cluster stability, which in turn is regulated by F-actin. The close bidirectional coupling between the stability of cadherin and associated F-actin shows how pAJs, and perhaps other AJs, allow cells to sense and coordinate the dynamics of the actin cytoskeleton in neighboring cells-a mechanism we term "dynasensing." Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.

Citation

Indrajyoti Indra, Regina B Troyanovsky, Lawrence Shapiro, Barry Honig, Sergey M Troyanovsky. Sensing Actin Dynamics through Adherens Junctions. Cell reports. 2020 Feb 25;30(8):2820-2833.e3