Local modulation of chemoattractant concentrations by single cells: dissection using a bulk-surface computational model.

Abstract:

:Chemoattractant gradients are usually considered in terms of sources and sinks that are independent of the chemotactic cell. However, recent interest has focused on 'self-generated' gradients, in which cell populations create their own local gradients as they move. Here, we consider the interplay between chemoattractants and single cells. To achieve this, we extend a recently developed computational model to incorporate breakdown of extracellular attractants by membrane-bound enzymes. Model equations are parametrized, using the published estimates from Dictyostelium cells chemotaxing towards cyclic AMP. We find that individual cells can substantially modulate their local attractant field under physiologically appropriate conditions of attractant and enzymes. This means the attractant concentration perceived by receptors can be a small fraction of the ambient concentration. This allows efficient chemotaxis in chemoattractant concentrations that would be saturating without local breakdown. Similar interactions in which cells locally mould a stimulus could function in many types of directed cell motility, including haptotaxis, durotaxis and even electrotaxis.

journal_name

Interface Focus

journal_title

Interface focus

authors

Mackenzie JA,Nolan M,Insall RH

doi

10.1098/rsfs.2016.0036

subject

Has Abstract

pub_date

2016-10-06 00:00:00

pages

20160036

issue

5

eissn

2042-8898

issn

2042-8901

pii

rsfs20160036

journal_volume

6

pub_type

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