Nitric oxide production, L-arginine transport and intracellular [Ca2+] changes in human platelets stimulated without stirring by low doses of collagen have been evaluated. Collagen decreased in a dose-dependent manner the nitric oxide formation. A reduction of about 30% of the basal level was produced by 5 mug/mL. Aspirin did not change the collagen effect. The inhibition was reversed by EGTA. Moreover collagen reduced L-arginine uptake. The exposure of platelets to 5 mug/mL collagen diminished of about 30% L-arginine transport. The specific involvement of the system y(+) is suggested. In addition in FURA 2-loaded platelets collagen induced a dose-dependent slow sustained [Ca2+] rise that was almost completely cancelled by EGTA. Finally the treatment of whole platelets with collagen affected in a dose-dependent manner the maximal nitric oxide formation, suggesting a direct effect at the level of nitric oxide synthase enzyme. The phosphorylation of specific serine/threonine residues regulated by protein kinase C could be involved. In conclusion during the early phases of platelet stimulation with collagen nitric oxide formation is diminished. This reduction can be due to a lower availability of L-arginine for cytosolic nitric oxide synthase and/or to a decreased activity related to modifications of the enzyme.

The L-arginine/NO pathway in the early phases of platelet stimulation by collagen

LEONCINI G;SIGNORELLO, MARIA GRAZIA
2005-01-01

Abstract

Nitric oxide production, L-arginine transport and intracellular [Ca2+] changes in human platelets stimulated without stirring by low doses of collagen have been evaluated. Collagen decreased in a dose-dependent manner the nitric oxide formation. A reduction of about 30% of the basal level was produced by 5 mug/mL. Aspirin did not change the collagen effect. The inhibition was reversed by EGTA. Moreover collagen reduced L-arginine uptake. The exposure of platelets to 5 mug/mL collagen diminished of about 30% L-arginine transport. The specific involvement of the system y(+) is suggested. In addition in FURA 2-loaded platelets collagen induced a dose-dependent slow sustained [Ca2+] rise that was almost completely cancelled by EGTA. Finally the treatment of whole platelets with collagen affected in a dose-dependent manner the maximal nitric oxide formation, suggesting a direct effect at the level of nitric oxide synthase enzyme. The phosphorylation of specific serine/threonine residues regulated by protein kinase C could be involved. In conclusion during the early phases of platelet stimulation with collagen nitric oxide formation is diminished. This reduction can be due to a lower availability of L-arginine for cytosolic nitric oxide synthase and/or to a decreased activity related to modifications of the enzyme.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/214404
Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact