Mast cell degranulation induced by chlorogenic acid.

Area of Science:

• Immunology
• Pharmacology

Background:

• Anaphylactoid reactions are hypersensitivity responses.
• Chlorogenic acid (CA) is a phenolic compound found in various plants.
• The precise mechanism of CA-induced anaphylactoid reactions requires elucidation.

Purpose of the Study:

• To investigate the cellular mechanisms underlying chlorogenic acid (CA)-induced anaphylactoid reactions.
• To determine if CA directly induces mast cell degranulation.

Main Methods:

• Assessed peritoneal mast cell degranulation in guinea pigs using alcian blue staining.
• Examined CA-induced degranulation in RBL-2H3 cells via light and transmission electron microscopy.
• Quantified beta-hexosaminidase release and phosphatidylserine translocation in RBL-2H3 cells using flow cytometry and fluorescent microscopy.

Main Results:

• CA (0.2-5.0 mmol/L) promoted peritoneal mast cell degranulation in vitro, but not in sensitized guinea pigs.
• CA induced dose- and time-dependent degranulation in RBL-2H3 cells.
• Observed characteristic degranulation via electron microscopy and increased beta-hexosaminidase release and phosphatidylserine translocation in RBL-2H3 cells.

Conclusions:

• Chlorogenic acid (CA) directly induces degranulation of mast cells.
• Mast cell degranulation by CA is a potential mechanism for CA-induced anaphylactoid reactions.