TY - JOUR U1 - Wissenschaftlicher Artikel A1 - Sales, Adria A1 - Holle, Andrew A1 - Kemkemer, Ralf T1 - Initial contact guidance during cell spreading is contractility-independent JF - Soft matter N2 - A wide variety of cell types exhibit substrate topography-based behavior, also known as contact guidance. However, the precise cellular mechanisms underlying this process are still unknown. In this study, we investigated contact guidance by studying the reaction of human endothelial cells (ECs) to well-defined microgroove topographies, both during and after initial cell spreading. As the cytoskeleton plays a major role in cellular adaptation to topographical features, two methods were used to perturb cytoskeletal structures. Inhibition of actomyosin contractility with the chemical inhibitor blebbistatatin demonstrated that initial contact guidance events are independent of traction force generation. However, cell alignment to the grooved substrate was altered at later time points, suggesting an initial ‘passive’ phase of contact guidance, followed by a contractility-dependent ‘active’ phase that relies on mechanosensitive feedback. The actin cytoskeleton was also perturbed in an indirect manner by culturing cells upside down, resulting in decreased levels of contact guidance and suggesting that a possible loss of contact between the actin cytoskeleton and the substrate could lead to cytoskeleton impairment. The process of contact guidance at the microscale was found to be primarily lamellipodia driven, as no bias in filopodia extension was observed on micron-scale grooves. Y1 - 2017 UN - https://nbn-resolving.org/urn:nbn:de:bsz:rt2-opus4-17448 SN - 1744-683X SS - 1744-683X U6 - https://doi.org/10.1039/c6sm02685k DO - https://doi.org/10.1039/c6sm02685k VL - 13 IS - 30 SP - 5158 EP - 5167 S1 - 10 PB - Royal Society of Chemistry CY - London ER -