A possible role for mono (ADP-ribosyl) transferase in the signalling pathway mediating neutrophil chemotaxis.

Abstract:

:1. Mono(ADP-ribosyl)transferase activity has been identified on the external surface of human polymorphonuclear neutrophil leucocytes (PMNs). The enzyme is released from the plasma membrane by phosphoinositide-specific phospholipase C, suggesting a glycosylphosphatidylinositol (GPI) linkage of the enzyme to the plasma membrane. Partial sequence of cDNA encoding the enzyme suggests that it is identical to the GPI-linked mono(ADP-ribosyl)-transferase identified previously on human skeletal muscle. 2. A panel of inhibitors of mono(ADP-ribosyl)transferase (including vitamins K1 and K3, novobiocin and nicotinamide) showed a rank order of inhibitory potency similar to that described for other mono(ADP-ribosyl)transferases. Furthermore, the mono(ADP-ribosyl)ation of agmatine was inhibited also by diethylamino (benzylidineamino)guanidine (DEA-BAG), another substrate of the enzyme related structurally to arginine. 3. There was a close linear correlation between the IC50 values for inhibition of mono(ADP-ribosyl)ation of agmatine by DEA-BAG or the enzyme inhibitors and their IC50 values for inhibition of receptor-dependent polymerization of cytoskeletal actin and chemotaxis. 4. These results suggest a role for mono(ADP-ribosyl)transferase in the transduction pathway involved in receptor-dependent re-alignment of the cytoskeleton during neutrophil chemotaxis.

journal_name

Br J Clin Pharmacol

authors

Allport JR,Donnelly LE,Kefalas P,Lo G,Nunn A,Yadollahi-Farsani M,Rendell NB,Murray S,Taylor GW,MacDermot J

doi

10.1046/j.1365-2125.1996.37014.x

subject

Has Abstract

pub_date

1996-07-01 00:00:00

pages

99-106

issue

1

eissn

0306-5251

issn

1365-2125

journal_volume

42

pub_type

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