Tuftsin-macrophage interaction: specific binding and augmentation of phagocytosis.

Abstract:

:The binding of [3H]tuftsin to normal and in vivo stimulated mouse peritoneal macrophage populations was studied at 22 degrees C. The [3H]tuftsin binding to thioglycollate-stimulated macrophages was shown to be rapid and saturable, with an equilibrium dissociation constant (K(D)) (calculated from a Scatchard plot) of 5.3 X 10(-8) M. The calculated number of binding sites per macrophage amounts to approximately 72,000. Binding competition studies with unlabelled tuftsin yielded a K(D) of 5.0 X 10(-8) M. [3H] [N-Acetyl-Thr1]tuftsin, an inactive analog of tuftsin, failed to bind specifically to thioglycollate-stimulated macrophages. [N-Acetyl-Thr1]tuftsin and the tripeptide [Des-Arg4]tuftsin failed to compete for tuftsin binding sites, while [D-Arg4]tuftsin, an analog with small tuftsin-like activity, exhibited a low degree of inhibition of [3H]tuftsin binding. Thus a rather high degree of specificity is involved in the binding of the tetrapeptide. Normal as well as six different macrophage populations induced by stimulation with thioglycollate, concanavalin-A, starch, mineral oil, glucan and Bacillus Calmette Guerrin (BCG), exhibited a similar degree of binding of [3H]tuftsin. Corynebacterium parvum (CP)-stimulated macrophages, on the other hand, showed a 6- to 10-fold-lower capacity for tuftsin binding. Under similar experimental conditions, mouse fibroblast and lymphocyte preparations revealed no detectable specific binding. Tuftsin augmented the phagocytic response of normal and stimulated macrophages assessed both for phagocytosis mediated via the Fc-receptor and via non-specific receptors. CP-stimulated macrophages did not exhibit an increased phagocytic response upon treatment with tuftsin.

journal_name

J Cell Physiol

authors

Bar-Shavit Z,Stabinsky Y,Fridkin M,Goldman R

doi

10.1002/jcp.1041000106

subject

Has Abstract

pub_date

1979-07-01 00:00:00

pages

55-62

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

100

pub_type

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