Laminin and fibronectin guideposts signal sustained but opposite effects to passing growth cones.
Guidepost cells are known to alter the behavior of growth cones in vivo, yet the nature of communication and the type of signals employed are largely undefined. The present study demonstrates that model guideposts, composed of a single molecular species, are sufficient to change the navigation and the behavior of advancing growth cones well beyond the time of contact. Laminin on model guideposts caused a sustained increase in growth cone velocity, whereas fibronectin led to a sustained decrease. A spatially discrete array of multiple laminin-model guideposts maintained increased growth rates on fibronectin, as expected for homogeneous laminin, and also provided unambiguous directional guidance information. Laminin-evoked growth cone responses required activation of protein kinase C-dependent intracellular signalling mechanisms.
Kuhn
T B
TB
Department of Anatomy and Neurobiology, Colorado State University, Fort Collins 80523.
Schmidt
M F
MF
Kater
S B
SB
D000818:Animals; D015153:Blotting, Western; D002448:Cell Adhesion; D002450:Cell Communication / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D005353:Fibronectins / Q000494:pharmacology*; D005727:Ganglia, Spinal / Q000502:physiology; D019012:Integrin beta1; D016023:Integrins / Q000032:analysis / Q000378:metabolism; D007797:Laminin / Q000494:pharmacology*; D016501:Neurites / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D009474:Neurons / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D011137:Polystyrenes; D011493:Protein Kinase C / Q000378:metabolism; D017474:Receptors, Laminin / Q000032:analysis / Q000378:metabolism; D015398:Signal Transduction
D005353:Fibronectins; D019012:Integrin beta1; D016023:Integrins; D007797:Laminin; D011137:Polystyrenes; D017474:Receptors, Laminin; D011493:Protein Kinase C