Karu 1989 | Mitochondria, ATP
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Karu T. Photobiology of low-power laser effects. Health Phys. 1989 May;56(5):691-704.
- Laser biostimulation is a photobiological phenomenon - Primary photo-acceptors are components of the respiratory chain. This explains the universality of low-power laser effects. - The respiratory chain components can be the photoacceptors in the case of cellular metabolism stimulation, as well as inhibition depending on the dose of light. At low doses, irradiation causes redox regulation of cellular metabiolism; at high doses photodynamic damage prevails. - Light quantum is only a trigger for cellular metabolism regulation. This explainsthe low doses and intensities needed. - The magnitude of the biostimulation effect depends on the physiological state of the cell before irradiation. This explains why biostimulation effect isnot always possible. - The therapeutic effects of low-power laser irradiation can be explained by an increase of proliferation of G 0 and G 1 cellsor by changes in the physiological activity of excitable cells.
This article discusses the biological processes of photobiomodulation. - Respiratory chain components are discussed as primary photo- acceptors. - The possible ways for photo-signal transduction and amplification are discussed. - It is proposed that enhanced wound healing due to irradiation with low- intensity visible laser light is due to increasing proliferation of cells.
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