Inflammatory mediators in late antigen-induced rhinitis

Area of Science:

• Allergy and Immunology
• Biochemistry
• Respiratory Medicine

Background:

• Allergic reactions manifest in immediate and late phases.
• Understanding the biochemical mediators of the late-phase response is crucial for targeted therapies.

Purpose of the Study:

• To investigate the biochemical mechanisms underlying the late-phase allergic response.
• To compare mediator profiles during immediate and late-phase reactions.

Main Methods:

• Nasal challenge with pollen antigen in 12 allergic patients.
• Measurement of histamine, tosyl-L-arginine methyl ester (TAME)-esterase, kinin, and prostaglandin D2 in nasal secretions.
• Assessment of mediator levels during immediate and late (3-11 hours post-challenge) phases.

Main Results:

• Nine patients exhibited both immediate and late-phase responses.
• The late phase showed increased histamine, TAME-esterase, and lower kinin levels compared to the immediate phase.
• Prostaglandin D2 levels increased in the immediate phase but not in the late phase; reappeared upon rechallenge.

Conclusions:

• The late-phase allergic response involves a distinct biochemical profile.
• Histamine and TAME-esterase increase during the late phase, while prostaglandin D2 production is notably absent.
• Mast cells and basophils are suggested to play a role in the late-phase response due to their mediator release patterns.