Actin-driven Golgi apparatus dispersal during collective migration of epithelial cells

Author:

Khuntia Purnati1,Rawal Simran1ORCID,Marwaha Rituraj1,Das Tamal1ORCID

Affiliation:

1. Tata Institute of Fundamental Research Hyderabad, Hyderabad 500 046, India

Abstract

As a sedentary epithelium turns motile during wound healing, morphogenesis, and metastasis, the Golgi apparatus moves from an apical position, above the nucleus, to a basal position. This apical-to-basal repositioning of Golgi is critical for epithelial cell migration. Yet the molecular mechanism underlying it remains elusive, although microtubules are believed to play a role. Using live-cell and super-resolution imaging, we show that at the onset of collective migration of epithelial cells, Golgi stacks get dispersed to create an unpolarized transitional structure, and surprisingly, this dispersal process depends not on microtubules but on actin cytoskeleton. Golgi–actin interaction involves Arp2/3-driven actin projections emanating from the actin cortex, and a Golgi-localized actin elongation factor, MENA. While in sedentary epithelial cells, actin projections intermittently interact with the apically located Golgi, and the frequency of this event increases before the dispersion of Golgi stacks, at the onset of cell migration. Preventing Golgi–actin interaction with MENA-mutants eliminates Golgi dispersion and reduces the persistence of cell migration. Taken together, we show a process of actin-driven Golgi dispersion that is mechanistically different from the well-known Golgi apparatus fragmentation during mitosis and is essential for collective migration of epithelial cells.

Funder

The Wellcome Trust DBT India Alliance

Max-Planck-Gesellschaft

Tata Institute of Fundamental Research

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

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