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Effect of aspirin on complement in vivo
Insights
Aspirin intake temporarily reduced complement activity and C1 inactivator levels in most healthy volunteers. These effects were short-lived, with levels typically normalizing within 30 minutes post-ingestion.
Area of Science:
- Immunology
- Pharmacology
Background:
- Aspirin is a widely used nonsteroidal anti-inflammatory drug.
- The complement system is a crucial part of innate immunity.
- Adverse reactions to aspirin can occur, but their mechanisms are not fully understood.
Purpose of the Study:
- To investigate the effect of a single 1g aspirin dose on complement consumption in healthy volunteers.
- To assess changes in complement activity (CH50) and specific complement components (C1, C4, C2).
- To evaluate the impact of aspirin on C1 inactivator (C1 IA) levels.
Main Methods:
- Administered 1g of aspirin to 20 healthy volunteers.
- Measured whole complement activity (CH50) before and after aspirin ingestion.
- Quantified levels of complement components C1, C4, C2, and C1 inactivator (C1 IA).
Main Results:
- Complement consumption was observed in 18 out of 20 volunteers.
- A slight to moderate decrease in CH50, C1, C4, and C2 levels was noted.
- Reduced C1 IA levels were found in 19 out of 20 volunteers.
- These changes were transient, with complement titers returning to normal levels within 30 minutes.
Conclusions:
- Aspirin ingestion transiently activates complement consumption and reduces C1 IA levels in healthy individuals.
- The observed effects are short-lived, suggesting a limited role in chronic aspirin-related adverse events.
- Further research is warranted to explore the precise role of complement in aspirin's pharmacological actions and potential adverse reactions.
Abstract:
Following ingestion of aspirin (1 g) complement consumption could be demonstrated in 18/20 healthy volunteers. A slight to moderate decrease of whole complement activity (CH50) and of the components C1, C4 and C2 was found. In addition, reduced levels of the C1 inactivator (C1 IA) were measured in 19/20 probands. The drop in C titers and C1 IA was only detectable within a short period of time and 30 min after ingestion of the drug the titers were usually returning to normal. In view of these findings, the possible role of complement in adverse reactions to aspirin is discussed.