In vivo functional tests for assessing immunotoxicity in birds

Area of Science:

• Avian immunology
• Environmental toxicology
• Wildlife health

Background:

• Assessing environmental contaminant impacts on avian immune systems is crucial for wildlife health.
• Existing methods require adaptation for diverse avian species and sensitive biomarker identification.

Purpose of the Study:

• To describe two integrative functional assays, the phytohemagglutinin (PHA) skin test and the sheep red blood cell (SRBC) hemagglutination assay, for assessing avian immunotoxicity.
• To highlight their utility as sensitive biomarkers in both laboratory and field settings.

Main Methods:

• Phytohemagglutinin (PHA) skin test: Measures T cell-mediated immunity by assessing wing web thickness changes post-injection.
• Sheep red blood cell (SRBC) hemagglutination assay: Evaluates antibody response to SRBC antigens, integrating B cell, T cell, and macrophage functions.

Main Results:

• The PHA skin test is a sensitive indicator of T cell function and has been linked to survival and colonization success in wild birds.
• The SRBC hemagglutination assay effectively measures antibody production and is adaptable to various avian species, including protected ones.
• Both assays are sensitive to a range of contaminants and easily adaptable, making them valuable screening tools.

Conclusions:

• The PHA and SRBC assays are effective, adaptable, and sensitive biomarkers for monitoring immunotoxicity in avian populations.
• These minimally invasive assays contribute to understanding environmental contaminant effects on wild and captive birds.
• Their application in ecological studies aids in assessing wildlife health and population dynamics.