Abstract

The role of Pannexin (PANX) channels during collective and single cell migration is increasingly recognized. Amongst many functions that are relevant to cell migration, here we focus on the role of PANX-mediated adenine nucleotide release and associated autocrine and paracrine signaling. We also summarize the contribution of PANXs with the cytoskeleton, which is also key regulator of cell migration. PANXs, as mechanosensitive ATP releasing channels, provide a unique link between cell migration and purinergic communication. The functional association with several purinergic receptors, together with a plethora of signals that modulate their opening, allows PANX channels to integrate physical and chemical cues during inflammation. Ubiquitously expressed in almost all immune cells, PANX1 opening has been reported in different immunological contexts. Immune activation is the epitome coordination between cell communication and migration, as leukocytes (i.e., T cells, dendritic cells) exchange information while migrating towards the injury site. In the current review, we summarized the contribution of PANX channels during immune cell migration and recruitment; although we also compile the available evidence for non-immune cells (including fibroblasts, keratinocytes, astrocytes, and cancer cells). Finally, we discuss the current evidence of PANX1 and PANX3 channels as a both positive and/or negative regulator in different inflammatory conditions, proposing a general mechanism of these channels contribution during cell migration.

Highlights

  • Cell communication and cell migration are key phenomena for development, tissue repair, and immune response; coordination of these responses are key for sustaining life [1–4]

  • We summarize the contribution of PANX channels during cell migration, emphasizing PANX1, that has been more widely studied

  • We have focused on immune cells as the integration of cell communication and cell migration is key for their function, despite mainly migrating as single cells

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Summary

INTRODUCTION

Cell communication and cell migration are key phenomena for development, tissue repair, and immune response; coordination of these responses are key for sustaining life [1–4]. A fine coordination of leukocyte communication is required for migration to clear an infection, or recruit other migrating cells towards an injury site. Immune cell migration follows the general rules of cell migration, and depends on. The study of immune cell migration is directly linked to development of new techniques to monitor the behavior of these cells in their native microenvironment [5, 12, 13], this is still very challenging. Motility has been studied in models with different levels of microenvironment complexity (i.e., 1D, 2D, and 3D), topographies (that do or do not impose cellular deformation), or that mimic their transmigration through tissue layers [6, 13, 14]

Danger Signals and the Role of Purinergic Signaling
Cell Polarity and PANXDependent Signaling
IMMUNE CELL MIGRATION
Neutrophils
T Cells
Dendritic Cells
Monocytes and Macrophages
ROLE OF TISSUE PANXs ON LEUKOCYTE RECRUITMENT
ROLE OF PANXs ON MIGRATION OF NON-IMMUNE CELLS
Fibroblasts and Keratinocytes, Role of PANXs During Skin Cell Migration
PANXs Role During Astrocytic Migration Under Inflammation
Cancer Cells, Differential Contribution of PANXs to Tumor Progression
PANXs and Cell Migration During Aging, Senescence, and Neurodegeneration
CONCLUDING REMARKS

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