title: Investigation of low-level laser therapy potentiality on proliferation and differentiation of human osteoblast-like cells in the absence/presence of osteogenic factors.
abstract: Several studies have shown that low-level laser irradiation (LLLI) has beneficial effects on bone regeneration. The objective of this study was to examine the in vitro effects of LLLI on proliferation and differentiation of a human osteoblast-like cell line (Saos-2 cell line). Cultured cells were exposed to different doses of LLLI with a semiconductor diode laser (659 nm; 10 mW power output). The effects of laser on proliferation were assessed daily up to seven days of culture in cells irradiated once or for three consecutive days with laser doses of 1 or 3 J/cm(2). The obtained results showed that laser stimulation enhances the proliferation potential of Saos-2 cells without changing their telomerase pattern or morphological characteristics. The effects on cell differentiation were assessed after three consecutive laser irradiation treatments in the presence or absence of osteo-inductive factors on day 14. Enhanced secretion of proteins specific for differentiation toward bone as well as calcium deposition and alkaline phosphatase activity were observed in irradiated cells cultured in a medium not supplemented with osteogenic factors. Taken together these findings indicate that laser treatment enhances the in vitro proliferation of Saos-2 cells, and also influences their osteogenic maturation, which suggest it is a helpful application for bone tissue regeneration.
authors.affiliation: University of Pavia, Department of Molecular Medicine, Biochemistry Unit "A.Castellani," INSTM UdR of Pavia, 27100 Pavia, ItalyeUniversity of Pavia, Interdipartimental Center for Tissue Engineering (CIT), 27100 Pavia, Italy.
authors.forename: Nora
authors.initials: N
authors.lastname: Bloise
authors.affiliation: University of Pavia, Department of Public Health, Experimental Medicine and Forensics, 27100 Pavia, ItalyeUniversity of Pavia, Interdipartimental Center for Tissue Engineering (CIT), 27100 Pavia, Italy.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Ceccarelli
authors.affiliation: University of Pavia, Department of Electrical, Computer, and Biomedical Engineering, 27100 Pavia, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Minzioni
authors.affiliation: University of Pavia, Department of Molecular Medicine, Biochemistry Unit "A.Castellani," INSTM UdR of Pavia, 27100 Pavia, ItalyeUniversity of Pavia, Interdipartimental Center for Tissue Engineering (CIT), 27100 Pavia, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Vercellino
authors.affiliation: University of Pavia, Department of Public Health, Experimental Medicine and Forensics, 27100 Pavia, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Benedetti
authors.affiliation: University of Pavia, Department of Public Health, Experimental Medicine and Forensics, 27100 Pavia, ItalyeUniversity of Pavia, Interdipartimental Center for Tissue Engineering (CIT), 27100 Pavia, Italy.
authors.forename: Maria Gabriella Cusella
authors.initials: MG
authors.lastname: De Angelis
authors.affiliation: University of Pavia, Department of Public Health, Experimental Medicine and Forensics, 27100 Pavia, ItalydDepartment of Occupational Medicine, Ergonomics and Disability, Salvatore Maugeri Foundation, IRCCS, Laboratory of Nanotechnology, 27100 Pavia, Italy.
authors.forename: Marcello
authors.initials: M
authors.lastname: Imbriani
authors.affiliation: University of Pavia, Department of Molecular Medicine, Biochemistry Unit "A.Castellani," INSTM UdR of Pavia, 27100 Pavia, ItalydDepartment of Occupational Medicine, Ergonomics and Disability, Salvatore Maugeri Foundation, IRCCS, Laboratory of Nanotechnology, 27100 Pavia, Italy.
authors.forename: Livia
authors.initials: L
authors.lastname: Visai
mesh_terms: D002454:Cell Differentiation / Q000528:radiation effects*; D002460:Cell Line; D049109:Cell Proliferation / Q000528:radiation effects*; D048430:Cell Shape / Q000528:radiation effects; D016326:Extracellular Matrix Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology*; D006801:Humans; D028022:Low-Level Light Therapy; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism / Q000528:radiation effects*; D015675:Osteocalcin / Q000032:analysis / Q000235:genetics / Q000378:metabolism
chemical_list: D016326:Extracellular Matrix Proteins; D015675:Osteocalcin