Banca de QUALIFICAÇÃO: JADSON ALEXANDRE SILVA LIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JADSON ALEXANDRE SILVA LIRA
DATE: 17/12/2020
TIME: 14:30
LOCAL: Plataforma Google Meet
TITLE:

EFFECT OF PHOTOBIOMODULATION ON THE VIABILITY AND PROLIFERATION OF HUMAN PERIODONTAL LIGAMENT STEM CELLS CULTURED ON POLYLATIC ACID FILMS

KEY WORDS:

Tissue engineering; biomaterials; stem cells; laser; cell proliferation.

PAGES: 46
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

Polylactic acid (PLA) is a biomaterial with diverse biomedical applications and has been a promising scaffold in tissue engineering mainly due to its biocompatibility, easy manipulation and low cost. Low-level laser irradiation (LLLI) has been shown to be a powerful tool to promote in vitro biostimulation in several cell types. The aim of this study was to evaluate the effectiveness of photobiomodulation with LLLI on the viability and proliferation of human periodontal ligament stem cells (hPDLSC) cultured on PLA scaffolds. PLA films were produced by solvent casting method and the surface morphology was evaluated by scanning electronic microscopy (SEM) and atomic force microscopy (AFM). hPDLSC were isolated, characterized and cultured on the PLA films. Two groups were evaluated: Control - non irradiated; and Laser - irradiated with diode laser (InGaAIP) with wavelength of 660 nm, power of 30 mW, and a single dose of 1 J/cm² with radiation emitted continuously. Cell viability analyzes were performed 24 and 48 hours after irradiation using the the Alamar Blue biochemical assay and Live/Dead morphological assay. Cell cycle events were assessed by flow cytometry and cell-biomaterial interaction was evaluated by SEM. The films produced showed a flat and regular surface, with the occasional presence of small pores and an average roughness of 59.381 nm. The results of Alamar Blue assay showed a greater cell metabolic activity in irradiated group compared to control at 24 (p<0.05) and 48 h (p<0.001), which was confirmed in the Live/Dead assay by a higher density of viable cells in the Laser group. In the analysis of the cell cycle, the Laser group showed an increase of cells in the G2/M phase compared to the Control group (p <0.001). SEM images showed a higher cell density in the irradiated group, with maintenance of cell morphology and projections. Taken together, the findings of this study demonstrated that photobiomodulation has the ability to increase the viability and proliferation of periodontal stem cells cultured on PLA scaffolds.

BANKING MEMBERS:
Presidente - 2220417 - CARLOS AUGUSTO GALVAO BARBOZA
Interna - 1298808 - MARCIA CRISTINA DA COSTA MIGUEL
Externo à Instituição - CARLOS EDUARDO BEZERRA DE MOURA - UFERSA