Suppression of pineal melatonin in Peromyscus leucopus by different monochromatic wavelengths of visible and near-ultraviolet light (UV-A)

Mean pineal melatonin content was significantly suppressed in white-footed mice exposed to specific wavelengths of light.

• Exposure to monochromatic light at wavelengths of 320, 340, 360, and 500 nm resulted in reduced melatonin levels compared to unexposed control mice.
• Red light (640 nm) did not suppress pineal melatonin levels at the same photon density.
• The study provides evidence for light-induced suppression of pineal melatonin in the white-footed mouse.
• Ultraviolet wavelengths as low as 320 and 340 nm are associated with significant suppression of melatonin.

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