Shared epitopes between the soluble proteins of Hypoderma lineatum and Hypoderma bovis first instars

Area of Science:

• Veterinary Entomology
• Immunology
• Parasitology

Background:

• Cattle develop resistance to hypodermyiasis from repeated exposure to Hypoderma grubs.
• Vaccination with Hypoderma lineatum proteins, like hypodermin A, protects against H. lineatum.
• A dual-species vaccine requires shared epitopes between H. lineatum and H. bovis proteins.

Purpose of the Study:

• To identify shared immunological epitopes between soluble proteins of Hypoderma bovis and Hypoderma lineatum first-instar larvae.
• To assess the potential for cross-protection against H. bovis using H. lineatum-derived vaccines.

Main Methods:

• Soluble proteins from H. lineatum and H. bovis first-instar larvae were separated using nondenaturing polyacrylamide gel electrophoresis.
• Proteins were transferred to nitrocellulose membranes and probed with various antisera (cow, rabbit, mouse monoclonal).
• Cross-reactivity was analyzed to identify shared epitopes.

Main Results:

• Significant cross-reactivity was observed; antibodies from H. lineatum-infested cattle bound 6 out of 10 H. bovis proteins.
• Shared epitopes were most commonly associated with hypodermin C (a collagenolytic protease) from H. lineatum.
• Hypodermin A from H. lineatum shared epitopes with a prominent H. bovis protein (HB1-2).
• Hypodermin B from H. lineatum did not show shared epitopes with H. bovis proteins.

Conclusions:

• The presence of shared epitopes between H. bovis proteins and hypodermins A and C of H. lineatum is demonstrated.
• This finding supports the potential for cross-protection against Hypoderma bovis through vaccination with H. lineatum recombinant proteins.