IL-12 and IL-23 affect photocarcinogenesis differently

Area of Science:

• Immunology
• Dermatology
• Photobiology

Background:

• Ultraviolet radiation (UVR) induces DNA damage, a primary factor in skin cancer development.
• Interleukin-12 (IL-12) and Interleukin-23 (IL-23) are cytokines that modulate immune responses and may reduce UVR-induced DNA damage.
• Both cytokines are present in the skin, suggesting a potential role in mitigating UVR-induced skin cancer risk.

Purpose of the Study:

• To investigate the individual roles of IL-12 and IL-23 in counteracting UVR-induced photocarcinogenesis.
• To determine whether IL-23 or IL-12 plays a more significant role in preventing UVR-induced skin tumors.

Main Methods:

• Utilized genetically modified mice lacking either the p35 subunit of IL-12 (IL-12p35-/-) or the p19 subunit of IL-23 (IL-23p19-/-).
• Subjected these mice to chronic UVR exposure.
• Analyzed tumor development probability using Kaplan-Meier survival analysis.

Main Results:

• Mice deficient in IL-23 (IL-23p19-/-) exhibited a significantly increased probability of developing skin tumors after chronic UVR exposure.
• Mice deficient in IL-12 (IL-12p35-/-) did not show a significant increase in UVR-induced skin tumor development.
• These findings indicate that IL-23, but not IL-12, plays a protective role against photocarcinogenesis in this model.

Conclusions:

• IL-23, but not IL-12, appears to counteract UVR-induced skin cancer development.
• The findings suggest that IL-23 may promote DNA repair mechanisms, thereby reducing cancer risk.
• This research has implications for therapeutic strategies involving IL-12 and IL-23 antibodies in inflammatory skin conditions and cancer prevention.