Japanese Cedar Pollen Allergens in Japan

Area of Science:

• Allergology and Immunology
• Environmental Health

Background:

• Cupressaceae tree pollen, including Japanese cedar and cypress, is a major global allergen.
• Japanese cedar pollinosis affects approximately 40% of the population, with increasing prevalence in children.
• Current pharmacotherapy for Japanese cedar pollinosis has limitations, including low patient satisfaction due to side effects like somnolence.

Purpose of the Study:

• To review the current understanding of Japanese cedar and cypress pollinosis.
• To highlight the limitations of pharmacotherapy for these conditions.
• To emphasize the potential of allergy immunotherapy (AIT) as a disease-modifying treatment.

Main Methods:

• Review of epidemiological data on Japanese cedar pollinosis prevalence.
• Analysis of allergen cross-reactivity between Japanese cedar and cypress.
• Comparison of pharmacotherapy and allergy immunotherapy (AIT) for pollinosis management.

Main Results:

• High prevalence of Japanese cedar pollinosis, particularly in young children.
• Significant amino acid sequence similarity between major allergens of Japanese cedar and cypress.
• Low patient satisfaction with pharmacotherapy due to efficacy and side effects.

Conclusions:

• Allergy immunotherapy (AIT) is a crucial treatment for Japanese cedar pollinosis.
• AIT addresses underlying immunological mechanisms, offering long-term benefits.
• AIT has the potential to alter the natural course of Japanese cedar pollinosis.