Isolation of turkey immunoglobulin-A

Area of Science:

• Immunology
• Veterinary Science
• Gastroenterology

Background:

• Immunoglobulin A (IgA) is a critical antibody for mucosal immunity.
• Understanding IgA distribution in avian species is important for poultry health.
• Previous studies have not fully characterized IgA in turkeys.

Purpose of the Study:

• To isolate and characterize turkey immunoglobulin A (IgA).
• To determine the presence and distribution of IgA in various turkey bodily fluids and secretions.
• To investigate potential differences in IgA forms within the turkey.

Main Methods:

• Isolation of IgA from turkey bile and gut using Sephadex G-200 filtration and DEAE ion-exchange chromatography.
• Preparation of monospecific antisera in rabbits against isolated turkey IgA.
• Detection of IgA using immunodiffusion in serum, saliva, lacrimal secretions, bile, gut washings, and tracheal washings.

Main Results:

• Turkey IgA was successfully isolated and characterized.
• IgA was detected in turkey serum, saliva, lacrimal secretions, bile, gut washings, and tracheal washings.
• IgA was notably absent in hatching-poult serum, egg white, and yolk.
• Two distinct forms of IgA (high and low molecular weight) were identified in different body fluids.

Conclusions:

• Turkey IgA is present in various mucosal secretions, suggesting a role in defending these sites.
• The absence of IgA in eggs indicates passive immunity is not primarily mediated by IgA in turkey eggs.
• The existence of different molecular weight forms of IgA may reflect distinct functions or origins within the turkey.