Identification of Fc and F(ab')/sub 2/ IgG receptors on human platelets

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · Proc. Natl. Acad. Sci. U.S.A.; (United States)

DOI:https://doi.org/10.1073/pnas.84.11.3575· OSTI ID:5436981

Vancura, S; Steiner, M

The human platelet receptors for normal, nonimmune IgG and its F(ab')/sub 2/ and Fc fragments were studied by the use of a cleavable, bifunctional, photoactivable, /sup 125/I-labeled cross-linking agent. Derivatization of the ligands with N-(4-(p-azido-m(/sup 125/I)iodophenylazo)benzoyl)-3-aminopropyl-N'-oxysuccinimide ester (Denny-Jaffe reagent) reduced their binding to platelets by greater than or equal to 20%. Cleavage of the azo linkage of the Denny-Jaffe reagent, which splits the molecule so that its /sup 125/I-labeled portion becomes associated with the receptor half of the cross-linked ligand-receptor complex, was utilized to directly identify receptors for the various immunoglobulin ligands. Specificity of the binding reaction could be demonstrated by suppressing the iodination of the receptors with excess nonderivatized ligand. Two principal IgG-related receptors could be identified by high-resolution NaDodSO/sub 4//PAGE and subsequent analysis of the electrophoretically transferred peptides to nitrocellulose filters for localization of radioactivity and immunological characterization. Intact monomeric IgG and F(ab')/sub 2/ fragments derived from it appeared to have the glycoprotein IIIa as the major receptor, whereas Fc fragments bound predominantly to a peptide of M/sub r/ approx. = 200,000.

• Research Organization: Memorial Hospital of Rhode Island, Pawtucket
• OSTI ID: 5436981
• Journal Information: Proc. Natl. Acad. Sci. U.S.A.; (United States), Vol. 84:11
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
BLOOD PLATELETS
CROSS-LINKING
IMMUNOGLOBULINS
RECEPTORS
BIOCHEMISTRY
DERIVATIZATION
ELECTROPHORESIS
GLUCOPROTEINS
IODINE 125
LIGANDS
MAN
ANIMALS
BETA DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY FLUIDS
CARBOHYDRATES
CHEMICAL REACTIONS
CHEMISTRY
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
GLOBULINS
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPES
MAMMALS
MATERIALS
MEMBRANE PROTEINS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
POLYMERIZATION
PRIMATES
PROTEINS
RADIOISOTOPES
SACCHARIDES
VERTEBRATES
550301* - Cytology- Tracer Techniques
550201 - Biochemistry- Tracer Techniques