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Cumulative effects from repeated exposures to ultraviolet radiation
The Journal of Investigative Dermatology
|May 1, 1981
Summary
Repeated exposure to ultraviolet radiation (UVR) lowers the skin's threshold for redness. This cumulative damage effect was most pronounced with UV-A radiation, even at low doses.
Area of Science:
- Dermatology
- Photobiology
- Toxicology
Background:
- Ultraviolet radiation (UVR) is known to cause skin damage.
- The cumulative effects of repeated low-dose UVR exposure on human skin are not fully quantified.
Purpose of the Study:
- To quantitatively assess the cumulative effects of repeated ultraviolet radiation (UVR) exposure on human skin.
- To compare the erythema-inducing potential of different UVR wavelengths (UV-A, UV-C) and the influence of 8-methoxypsoralen.
Main Methods:
- Repeated administration of subliminal doses of UVR at 24-hour intervals.
- Assessment of erythema threshold dose following UVR exposure.
- Comparison of UV-A and UV-C effectiveness at erythemogenically equivalent doses.
- Evaluation of combined UV-A and 8-methoxypsoralen effects.
Main Results:
- Repeated UVR exposure significantly lowered the erythema threshold dose, indicating increased skin sensitivity.
- UV-A radiation was more effective in lowering the erythema threshold than UV-C radiation at equivalent doses.
- Combined exposure to subthreshold UV-A doses and topical 8-methoxypsoralen resulted in a more pronounced cumulative effect.
Conclusions:
- Acute UVR damage to human skin is cumulative.
- UV-A radiation plays a significant role in cumulative UVR-induced skin damage.
- The photosensitizing agent 8-methoxypsoralen enhances the cumulative effects of UV-A radiation.