Characterization of a 14,000 dalton antigen of Dirofilaria immitis infective third stage larvae
Immunogenic proteins of Dirofilaria immitis (canine heartworm) were identified by probing extracts of adult worms or their excretory-secretory proteins (ESP) blotted to nitrocellulose following SDS-PAGE with control or infected dog sera. A 14,000 dalton antigen (a prominent component of ESP by protein staining) was consistently recognized both in extracts and ESP by dog sera as early as three months post infection. This indicates a larval origin for the antigen since no adult worms are present until approximately five months post infection. Monoclonal antibodies (MAbs) prepared against the 14,000 dalton antigen confirmed by immunoblotting that this antigen is expressed by infective third stage larvae, adults and microfilariae and is present intact in the sera of infected dogs. Surface-labelling of whole adult D. immitis with Na/sup 125/I produced radiolabelled antigens closely corresponding to those of ESP. An anti-14,000 dalton MAb was able to immunoprecipitate radiolabelled antigen which strongly suggest a surface or membrane location in the intact organism. Gel filtration data suggests that the protein is a native monomer. A MAb-affinity column has been used to purify the 14,000 dalton antigen to at least 98% homogeneity in one step from crude worm extracts. Further fractionation by HPLC yields a homogeneous preparation. Amino acid analysis and the N-terminal amino acid sequence data will be presented.
- Research Organization:
- Allelix Inc., Mississauga, Ontario
- OSTI ID:
- 7025388
- Report Number(s):
- CONF-8606151-
- Journal Information:
- Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States), Journal Name: Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States) Vol. 45:6; ISSN FEPRA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
AMINO ACID SEQUENCE
ANIMALS
ANTIBODIES
ANTIGENS
ASCHELMINTHES
BETA DECAY RADIOISOTOPES
CELL CONSTITUENTS
CELL MEMBRANES
CHROMATOGRAPHY
DAYS LIVING RADIOISOTOPES
DOGS
ELECTRON CAPTURE RADIOISOTOPES
ELECTROPHORESIS
HELMINTHS
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLING
LARVAE
LIQUID COLUMN CHROMATOGRAPHY
MAMMALS
MEMBRANES
MOLECULAR STRUCTURE
MONOCLONAL ANTIBODIES
NEMATODES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
PROTEINS
PURIFICATION
RADIOISOTOPES
SEPARATION PROCESSES
TRACER TECHNIQUES
VERTEBRATES