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Microfluidic Platform for Measuring Neutrophil Chemotaxis from Unprocessed Whole Blood

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Flavonoid modulation of human neutrophil function.

W W Busse, D E Kopp, E Middleton

The Journal of Allergy and Clinical Immunology

|June 1, 1984

Summary

This summary is machine-generated.

Flavonoids show varied effects on neutrophil functions related to inflammation. While some flavonoids significantly inhibit neutrophil chemiluminescence, their impact on enzyme release and superoxide production is less pronounced and depends on specific compounds and conditions.

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Area of Science:

Immunology
Pharmacology
Biochemistry

Background:

Flavonoids are plant-derived compounds recognized for their anti-inflammatory properties.
Neutrophil functions, including lysosomal enzyme release, chemiluminescence (CL), and superoxide anion production, are critical indicators of inflammation.

Purpose of the Study:

To investigate the impact of various flavonoids on key neutrophil functions associated with inflammation.
To determine the differential effects of specific flavonoids on neutrophil chemiluminescence, beta-glucuronidase release, and superoxide anion generation.

Main Methods:

Tested nine flavonoids at a concentration of 10(-5)M for their effects on neutrophil chemiluminescence (CL) response to opsonized zymosan.
Evaluated the inhibition of lysosomal beta-glucuronidase release from neutrophils stimulated with opsonized zymosan using concentrations ranging from 1.5 x 10(-4)M to 2 x 10(-4)M.
Assessed the effect of quercetin on neutrophil superoxide anion generation.

Main Results:

Quercetin and eight other flavonoids significantly inhibited the neutrophil CL response by approximately 60% or more at 10(-5)M.
Only quercetin and chalcone demonstrated inhibition of beta-glucuronidase release, and only at higher concentrations (1.5-2 x 10(-4)M).
Quercetin also inhibited superoxide anion generation, but to a lesser extent than its effect on CL.

Conclusions:

Flavonoid activity in modulating neutrophil functions is not uniform; it varies based on the specific flavonoid, the measured neutrophil response, and the activating stimulus.
Structural features of flavonoids play a crucial role in their differential effects on inflammatory pathways involving neutrophils.