RESUMO
We studied podosome formation and development in activated monocytes (THP1) at ICAM1 (intercellular adhesion molecule 1) nanopatterns of circular and ring-shaped domains and show that cellular binding to a preclustered ICAM1 nanopattern requires ligand patches of at least 200 nm (corresponding to 14 or more integrins). Podosome-like adhesion formation depends on the structure of the ligand pattern under the developing podosome with larger single domains promoting adhesion in a single patch and multiple smaller domains allowing podosome formation by integration of at least 2 smaller domains on either side of the podosome core. Maturation to rosette structures and recruitment of proteases were only observed with macroscopic ICAM1 presentation.
Assuntos
Proteínas Imobilizadas/metabolismo , Molécula 1 de Adesão Intercelular/metabolismo , Monócitos/citologia , Nanoestruturas/química , Podossomos/metabolismo , Adesão Celular , Linhagem Celular , Humanos , Proteínas Imobilizadas/análise , Molécula 1 de Adesão Intercelular/análise , Monócitos/metabolismoRESUMO
Numerous protein patterning methodologies are used extensively for biomedical research and development. We have developed a novel bottom-up protein patterning method using a combination of self-assembly processes in the meso to molecular scale range to allow hierarchical protein patterns to be straightforwardly fabricated with low cost over large areas. As a proof of principle, we patterned vitronectin in various dimensional hierarchies using meso to nanoscale colloids and self-assembled monolayers.