Association between the renin angiotensin system and anaphylaxis

Area of Science:

• Immunology
• Allergy Research
• Cardiovascular Physiology

Background:

• Hymenoptera venom anaphylaxis is a severe allergic reaction.
• The renin-angiotensin system (RAS) plays a role in cardiovascular regulation.
• Previous research has not fully elucidated the RAS's role in anaphylaxis.

Purpose of the Study:

• To investigate the association between hymenoptera venom anaphylaxis and the renin-angiotensin system.
• To evaluate the impact of immunotherapy on RAS components in allergic patients.
• To explore the role of RAS in the severity of anaphylactic reactions.

Main Methods:

• Plasma levels of renin, angiotensinogen, angiotensin I, and angiotensin II were measured in patients with hymenoptera venom anaphylaxis and healthy controls.
• Leukocyte angiotensin II concentrations were assessed.
• Patients underwent sting provocation tests before and after immunotherapy.
• Correlation analysis was performed between clinical symptom severity and RAS component levels.

Main Results:

• Patients with hymenoptera venom anaphylaxis exhibited significantly lower plasma levels of renin, angiotensinogen, angiotensin I, and angiotensin II compared to controls.
• A significant inverse correlation was observed between anaphylaxis severity and plasma RAS component levels.
• In patients with successful immunotherapy, RAS component levels were significantly higher and normalized to control levels.
• Successful immunotherapy led to a significant increase in leukocyte angiotensin II concentrations.

Conclusions:

• The renin-angiotensin system may play a crucial role in hymenoptera venom anaphylaxis.
• Lower RAS activity is associated with increased anaphylaxis severity.
• Immunotherapy appears to restore normal RAS function in allergic individuals.
• Targeting the renin-angiotensin system could be a potential therapeutic strategy for anaphylaxis.