Open AccessCirculating granulocyte lifespan in compensated alcohol‐related cirrhosis: a pilot study
Author(s) -
Potts Jonathan R.,
Farahi Neda,
Heard Sarah,
Chilvers Edwin R.,
Verma Sumita,
Peters Adrien M.
Publication year - 2016
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.12836
Subject(s) - granulocyte , cirrhosis , medicine , cd15 , in vivo , gastroenterology , alcoholic liver disease , primary biliary cirrhosis , absolute neutrophil count , immunology , biology , toxicity , cd34 , stem cell , neutropenia , microbiology and biotechnology , genetics
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 − t ½ ), determined using indium‐111 ( 111 In)‐radiolabeled granulocytes, is ~7 h. In this pilot study, we aimed to measure the in vivo G − t ½ 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 CD 15. Granulocyte‐associated radioactivity was expressed relative to peak activity, plotted over time, and G − t ½ estimated from data up to 12 h PI . This was compared with normal neutrophil half‐time ( N − t ½ ), 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 − t ½ in cirrhosis was significantly lower than N − t ½ 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.