Antiviral therapy decreases GpIIb/IIIa activation of platelets in patients with chronic hepatitis C.
Interferon alpha (IFN-alpha) is used to treat haematological and solid malignancies and is the gold standard therapy for chronic hepatitis C infection in combination with ribavirin. It has a well known platelet lowering effect and was recently shown to impair platelet aggregation in the presence of various agonists and has been accused to increase patients' bleeding risk during IFN-alpha therapy. Thus, we hypothesised that antiviral treatment decreases GpIIb/IIIa activation and affects global platelet function. In a prospective clinical trial, we examined the effects of combination therapy with pegylated IFN-alpha 2a (PegIFN-alpha 2a) and ribavirin on platelet GpIIb/IIIa activation and platelet secretion in 20 patients with chronic hepatitis C at week 2, 4, 8 and 12 after the beginning of therapy. In addition, we determined global platelet function (CEPI-CT) with the PFA-100 and vWF-Ag levels. Antiviral therapy significantly decreased GpIIb/IIIa activation in a time dependent manner, whereas markers of platelet secretion (P-selectin, beta-thromboglobulin) remained unchanged. Despite a marked elevation of vWF-Ag levels, CEPI-CT did not change compared to baseline levels. Antiviral therapy significantly decreases GpIIb/IIIa activation in patients with chronic hepatitis C, while vWG-Antigen levels are markedly increased and alpha-granule secretion is not affected. This does not result in an alteration of global platelet function as assessed by the PFA-100, because elevated vWF-Antigen levels might compensate for the acquired defect.
Sieghart
Wolfgang
W
Department of Internal Medicine IV, Division of Gastroenterology and Hepatology, Medical University Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria.
Homoncik
Monika
M
Jilma
Bernd
B
Formann
Elisabeth
E
Ferenci
Peter
P
Gangl
Alfred
A
Peck-Radosavljevic
Markus
M
D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000008:administration & dosage* / Q000494:pharmacology; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D002908:Chronic Disease; D004359:Drug Therapy, Combination; D005260:Female; D006526:Hepatitis C / Q000097:blood* / Q000188:drug therapy*; D006801:Humans; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D015539:Platelet Activation / Q000187:drug effects*; D010979:Platelet Function Tests; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000187:drug effects* / Q000502:physiology; D011092:Polyethylene Glycols / Q000627:therapeutic use; D011994:Recombinant Proteins; D012254:Ribavirin / Q000627:therapeutic use; D014841:von Willebrand Factor / Q000032:analysis
D000998:Antiviral Agents; D015415:Biomarkers; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; D011994:Recombinant Proteins; D014841:von Willebrand Factor; D011092:Polyethylene Glycols; D012254:Ribavirin; C100416:peginterferon alfa-2a