Circulating granulocyte lifespan in compensated alcohol-related cirrhosis: a pilot study

Potts, Jonathan R, Farhi, Neda, Heard, Sarah, Chilvers, Edwin R, Verma, Sumita and Peters, Adrien M (2016) Circulating granulocyte lifespan in compensated alcohol-related cirrhosis: a pilot study. Physiological Reports, 4. e12836. ISSN 2051-817X

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Abstract

Background and aims: 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 (111In)-radiolabelled granulocytes, is approximately 7 h. In this pilot study we aimed to measure the in vivo G-t½ in compensated alcohol-related cirrhosis.
Methods: Sequential venous blood samples were obtained in abstinent subjects with alcohol-related cirrhosis over 24 h post injection (PI) of minimally manipulated 111In-radiolabelled autologous mixed leucocytes. 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 centre.
Results: Seven patients with cirrhosis (6 male, aged 57.8 ±9.4yrs, all Child-Pugh class A) and seven normal controls (3 male, 64.4 ±5.6yrs) were studied. Peripheral blood neutrophil counts were similar in both groups (4.6 (3.5-5.5) x 109/l vs 2.8 (2.7-4.4) x 109/l respectively, P=0.277). G-t½ in cirrhosis was significantly lower than N-t½ in controls (2.7 ±0.5h vs 4.4 ±1.0h, P=0.007). Transient rises in granulocyte and neutrophil-associated activities occurred in 4 patients from each group, typically earlier in cirrhosis (4-6 h PI) than in controls (8-10 h), suggesting recirculation of radiolabelled cells released from an unidentified focus.
Conclusions: 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 aetiologies.

Item Type: Article
Schools and Departments: Brighton and Sussex Medical School > Clinical and Experimental Medicine
Subjects: R Medicine
R Medicine > R Medicine (General)
Depositing User: Sumita Verma
Date Deposited: 18 Jan 2017 15:52
Last Modified: 21 Sep 2017 10:08
URI: http://sro.sussex.ac.uk/id/eprint/66336

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