Abstract
Neutrophils are key components of the immune system and motility is central their function during the inflammatory response. We have previously demonstrated that neutrophils are capable of switching their motile phenotype between amoeboid-like and keratocyte-like in response to the ligand density of adhesion molecules (Henry et al. in Int Biol 6:348–356, 2014). In this study, we engineered planar micropatterned surfaces that presented adhesion molecules in local islands of high density, separated by regions largely devoid of ligands. By controlling the geometry of islands we made arrays in which the local (on island) adhesion density was high but the global (multi-island) adhesion density over the entire cell-substrate interface was low. Neutrophils in contact with these island arrays assumed a well-spread and directionally-persistent motile phenotype (keratocyte-like) in contrast to the classical amoeboid morphology they display on uniform fields of high adhesion density. By virtue of our rationally designed substrates, we were able to conclude that neutrophils were integrating the stimulation received across their entire contact interface; furthermore, they were able to mount this whole cell response on the timescale of seconds. This work demonstrates the capacity of adhesive microenvironments to direct the phenotype of cell motility, which has broader implications in physiologic processes such as inflammation and cancer metastasis.
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Acknowledgements
We are grateful to Eric Johnston for laboratory assistance and Christopher S. Chen, PhD and Ravi A. Desai, PhD for their time and expertise in teaching us the stamp-off method of microcontact printing. Funding for this work was provided by a National Science Foundation Graduate Research Fellowship to SJH and grants from the National Institutes of Health (HL18208 and GM104287) to DAH.
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Associate Editor Konstantinos Konstantopoulos oversaw the review of this article.
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Movie S1
Amoeboid to keratocyte-like phenotypic switch. A small convective flow in the system pushes amoeboid neutrophils from the high density continuous field of fibronectin across the stamp-off control domain and into the hybrid islands domain. Rapid transitions on the timescale of seconds take place as amoeboid cells assume the keratocyte-like phenotype. No adhesion is observed in the stamp-off control domain implying that the residual protein between islands is not sufficiently stimulatory to support the keratocyte-like phenotype observed. Supplementary material 2 (MOV 882 kb)
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Henry, S.J., Crocker, J.C. & Hammer, D.A. Motile Human Neutrophils Sense Ligand Density Over Their Entire Contact Area. Ann Biomed Eng 44, 886–894 (2016). https://doi.org/10.1007/s10439-015-1408-2
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DOI: https://doi.org/10.1007/s10439-015-1408-2