Immunological effects of solarium exposure

Area of Science:

• Immunology
• Dermatology
• Photobiology

Background:

• Artificial tanning using solariums is a popular practice.
• The effects of artificial ultraviolet (UV) radiation on the human immune system are not fully understood.
• Assessing immune function changes after controlled UV exposure is crucial for public health.

Purpose of the Study:

• To investigate the impact of artificial UV radiation from a solarium on various aspects of human immune function.
• To compare immune responses in subjects exposed to UV radiation with age- and sex-matched controls.

Main Methods:

• Normal volunteers underwent a standard solarium tanning treatment.
• Immune function tests were conducted before, immediately after, and two weeks post-exposure.
• Measurements included skin test responses to dinitrochlorobenzene (DNCB), lymphocyte counts and subpopulations (OKT3+, OKT4+, OKT8+), T-cell activity, and natural killer cell activity.

Main Results:

• Solarium exposure led to reduced DNCB skin test responses and slightly decreased blood lymphocyte numbers.
• Significant alterations in lymphocyte subpopulations were observed, including an increase in OKT8+ suppressor/cytotoxic T cells and a decrease in OKT4+ helper T cells, lowering the OKT4/OKT8 ratio.
• Increased suppressor T-cell activity against IgG production and depressed natural killer cell activity were noted.
• Some immune function changes persisted two weeks after UV exposure cessation.

Conclusions:

• Standard solarium use can induce temporary but significant immunosuppression.
• The observed immune alterations, particularly the shift in T-cell subsets and reduced natural killer cell activity, may have implications for skin health and susceptibility to infections.
• Further research is needed to understand the long-term consequences of artificial UV exposure on immune homeostasis.