Stem cell proliferation under low intensity laser irradiation: A preliminary study

Lasers in Surgery and Medicine - Tập 40 Số 6 - Trang 433-438 - 2008
Fernanda de Paula Eduardo1, Daniela Franco Bueno, Patrícia Moreira de Freitas, Márcia Martins Marques, Maria Rita Passos‐Bueno, Carlos Eduardo, Mayana Zatz
1Hospital Israelita Albert Einstein, Unit of Bone Marrow Transplantation, São Paulo 05651-901, SP, Brazil.

Tóm tắt

AbstractBackground and ObjectivesPhototherapy with low intensity laser irradiation has shown to be effective in promoting the proliferation of different cells. The aim of this in vitro study was to evaluate the potential effect of laser phototherapy (660 nm) on human dental pulp stem cell (hDPSC) proliferation.Study Design/Materials and MethodsThe hDPSC cell strain was used. Cells cultured under nutritional deficit (10% FBS) were either irradiated or not (control) using two different power settings (20 mW/6 seconds to 40 mW/3 seconds), with an InGaAIP diode laser. The cell growth was indirectly assessed by measuring the cell mitochondrial activity through the MTT reduction‐based cytotoxicity assay.ResultsThe group irradiated with the 20 mW setting presented significantly higher MTT activity at 72 hours than the other two groups (negative control—10% FBS—and lased 40 mW with 3 seconds exposure time). After 24 hours of the first irradiation, cultures grown under nutritional deficit (10% FBS) and irradiated presented significantly higher viable cells than the non‐irradiated cultures grown under the same nutritional conditions.ConclusionsUnder the conditions of this study it was possible to conclude that the cell strain hDPSC responds positively to laser phototherapy by improving the cell growth when cultured under nutritional deficit conditions. Thus, the association of laser phototherapy and hDPSC cells could be of importance for future tissue engineering and regenerative medicine. Moreover, it opens the possibility of using laser phototherapy for improving the cell growth of other types of stem cells. Lesers Surg. Med. 40:433–438, 2008. © 2008 Wiley‐Liss, Inc.

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Lasers in Surgery and Medicine

Tập 40 Số 6

433-438

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