Photobiomodulation of human osteoblast-like cells in vitro by low-intensity pulsed LED light.

Visible light irradiation is an emerging area in regenerative medicine research. We hypothesized that low intensity pulsed LED light irradiance may exert photobiomodulatory effects on cultured osteoblast-like cells.

To test this hypothesis, we investigated cell proliferation and markers of cell maturation and metabolic activity following pulsed LED irradiance.

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Monolayer explant cultures of human osteoblast-like cells were exposed four times in 24-hour intervals to 2 minutes of pulsed white LED irradiance of 2.4-2.5 mW/cm2 and its different spectra of 0.2-0.5 mW/cm2 (frequency range of 10-40 Hz).