title: Neurite branching on deformable substrates.
abstract: The mechanical properties of substrates underlying cells can have profound effects on cell structure and function. To examine the effect of substrate deformability on neuronal cell growth, protein-laminated polyacrylamide gels were prepared with differing amounts of bisacrylamide to generate substrates of varying deformability with elastic moduli ranging from 500 to 5500 dyne/cm. Mouse spinal cord primary neuronal cells were plated on the gels and allowed to grow and extend neurites for several weeks in culture. While neurons grew well on the gels, glia, which are normally co-cultured with the neurons, did not survive on these deformable substrates even though the chemical environment was permissive for their growth. Substrate flexibility also had a significant effect on neurite branching. Neurons grown on softer substrates formed more than three times as many branches as those grown on stiffer gels. These results show that mechanical properties of the substrate specifically direct the formation of neurite branches, which are critical for appropriate synaptic connections during development and regeneration.
authors.affiliation: Division of Experimental Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. lflanaga@uci.edu
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Flanagan
authors.forename: Yo-El
authors.initials: YE
authors.lastname: Ju
authors.forename: Beatrice
authors.initials: B
authors.lastname: Marg
authors.forename: Miriam
authors.initials: M
authors.lastname: Osterfield
authors.forename: Paul A
authors.initials: PA
authors.lastname: Janmey
mesh_terms: D000180:Acrylic Resins; D000818:Animals; D001672:Biocompatible Materials; D002465:Cell Movement / Q000502:physiology; D048429:Cell Size; D002478:Cells, Cultured; D003094:Collagen; D004338:Drug Combinations; D005782:Gels; D007797:Laminin; D051379:Mice; D008810:Mice, Inbred C57BL; D009416:Nerve Regeneration / Q000502:physiology; D016501:Neurites / Q000502:physiology*; D011509:Proteoglycans; D013116:Spinal Cord / Q000166:cytology*; D013314:Stress, Mechanical; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D003094:Collagen; D004338:Drug Combinations; D005782:Gels; D007797:Laminin; D011509:Proteoglycans; D000099166:Polyacrylamides; C059485:matrigel