title: Attachment, spreading and short-term proliferation of human osteoblastic cells cultured on chitosan films with different degrees of acetylation.
abstract: Chitosan (Ch) is being actively investigated as a non-protein template for the growth of an increasing number of anchorage-dependent cells, including chondrocytes and bone cells. In the present work, Ch films with degrees of N-acetylation (DAs) in the range of 4 to 49% were evaluated with respect to the attachment, spreading and short-term proliferation of osteoblasts, using human osteoblastic MG-63 cells. The films were characterized in terms of surface morphology and surface charge by atomic force microscopy and streaming potential measurements, respectively. Cell attachment was assessed after 3 and 24 h of cell culture. After 24 h of incubation, cell attachment was found to be dependent on the DA, lower DAs favouring cell adhesion. With time, cell spreading and cytoskeleton organization were only attained for DAs <or= 13%. Regarding cell proliferation, cells grown on films with the lowest DA (4%) revealed a higher specific growth rate as compared to those grown on films with higher DAs. Films with a DA of 49% failed to sustain cell proliferation. In addition, a longer lag-phase was observed on Ch, as compared to TCPS, in accordance to an observed delay of cell spreading. The present findings revealed that differences in the DA as small as 9% may be critical in terms of the osteoblast response to two-dimensional Ch-based matrices.
authors.affiliation: INEB - Instituto de Engenharia Biomédica, Laboratório de Biomateriais, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal. iamaral@ineb.up.pt
authors.forename: I F
authors.initials: IF
authors.lastname: Amaral
authors.forename: A L
authors.initials: AL
authors.lastname: Cordeiro
authors.forename: P
authors.initials: P
authors.lastname: Sampaio
authors.forename: M A
authors.initials: MA
authors.lastname: Barbosa
mesh_terms: D000107:Acetylation; D001672:Biocompatible Materials / Q000737:chemistry / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D048430:Cell Shape / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D048271:Chitosan / Q000737:chemistry* / Q000494:pharmacology*; D003599:Cytoskeleton / Q000378:metabolism; D006801:Humans; D018625:Microscopy, Atomic Force; D010006:Osteoblasts / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D048271:Chitosan