Circulating granulocyte lifespan in compensated alcohol-related cirrhosis: a pilot study.
Although granulocyte dysfunction is known to occur in cirrhosis, in vivo studies of granulocyte lifespan have not previously been performed. The normal circulating granulocyte survival half-time (G - t½), determined using indium-111 ((111)In)-radiolabeled granulocytes, is ~7 h. In this pilot study, we aimed to measure the in vivo G - t½ in compensated alcohol-related cirrhosis. Sequential venous blood samples were obtained in abstinent subjects with alcohol-related cirrhosis over 24 h post injection (PI) of minimally manipulated (111)In-radiolabeled autologous mixed leukocytes. Purified granulocytes were isolated from each sample using a magnetic microbead-antibody technique positively selecting for the marker CD15. Granulocyte-associated radioactivity was expressed relative to peak activity, plotted over time, and G - t½ estimated from data up to 12 h PI This was compared with normal neutrophil half-time (N - t½), determined using a similar method specifically selecting neutrophils in healthy controls at a collaborating center. Seven patients with cirrhosis (six male, aged 57.8 ± 9.4 years, all Child-Pugh class A) and seven normal controls (three male, 64.4 ± 5.6 years) were studied. Peripheral blood neutrophil counts were similar in both groups (4.6 (3.5 - 5.5) × 10(9)/L vs. 2.8 (2.7 - 4.4) × 10(9)/L, respectively, P = 0.277). G - t½ in cirrhosis was significantly lower than N - t½ in controls (2.7 ± 0.5 h vs. 4.4 ± 1.0 h, P = 0.007). Transient rises in granulocyte and neutrophil-associated activities occurred in four patients from each group, typically earlier in cirrhosis (4-6 h PI) than in controls (8-10 h), suggesting recirculation of radiolabeled cells released from an unidentified focus. Reduced in vivo granulocyte survival in compensated alcohol-related cirrhosis is a novel finding and potentially another mechanism for immune dysfunction in chronic liver disease. Larger studies are needed to corroborate these pilot data and assess intravascular neutrophil residency in other disease etiologies.
Department of Gastroenterology and Hepatology, Brighton and Sussex University Hospitals NHS Trust, Brighton, United Kingdom Department of Medicine, Brighton and Sussex Medical School, Brighton, United Kingdom jonathan.potts@nhs.net.
Jonathan R
JR
Potts
Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom.
Neda
N
Farahi
Department of Nuclear Medicine, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom.
Sarah
S
Heard
Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom.
Edwin R
ER
Chilvers
Department of Gastroenterology and Hepatology, Brighton and Sussex University Hospitals NHS Trust, Brighton, United Kingdom Department of Medicine, Brighton and Sussex Medical School, Brighton, United Kingdom.
Sumita
S
Verma
Division of Clinical and Laboratory Investigation, Brighton and Sussex Medical School, Brighton, United Kingdom.
Adrien M
AM
Peters
D000368:Aged; D005260:Female; D006098:Granulocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007962:Leukocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D008104:Liver Cirrhosis, Alcoholic / Q000097:blood* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009504:Neutrophils / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D010865:Pilot Projects
Alcohol‐related liver disease; cirrhosis; granulocyte; neutrophil