The Malaria Metabolite HMBPP Does Not Trigger Erythrocyte Terpene Release

Area of Science:

• Parasitology
• Chemical Ecology
• Human Physiology

Background:

• Malaria infection increases host attractiveness to mosquitoes.
• Alpha-pinene, a volatile organic compound, is associated with Plasmodium infection and attracts mosquitoes.
• The mechanism behind elevated alpha-pinene during malaria remains unclear.

Purpose of the Study:

• To investigate the presence and variability of endogenous alpha-pinene in human erythrocytes.
• To determine if the malaria metabolite (E)-4-hydroxy-3-methyl-but-2-enyl pyrophosphate (HMBPP) affects erythrocyte alpha-pinene levels.

Main Methods:

• Gas chromatography-mass spectrometry was used to quantify alpha-pinene levels in human erythrocytes.
• Erythrocytes from multiple donors were analyzed.
• In vitro experiments treated erythrocytes with HMBPP.

Main Results:

• Endogenous alpha-pinene is present in human erythrocytes.
• Alpha-pinene levels exhibit significant inter-individual variation among donors.
• HMBPP treatment did not alter alpha-pinene levels in erythrocytes.

Conclusions:

• The previously suggested link between HMBPP and elevated host alpha-pinene levels is not supported by these findings.
• The source of increased alpha-pinene in malaria-infected hosts requires further investigation.
• Understanding erythrocyte volatile organic compound profiles is crucial for malaria vector control strategies.