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The effects of exercise and diurnal variation on monocyte subsets and monocyte-platelet aggregates.
MedLine Citation:
PMID:  22356533     Owner:  NLM     Status:  Publisher    
Eur J Clin Invest 2012 ABSTRACT: Background  Monocytes are important mediators in the pathophysiology of cardiovascular disease, but only scarce data are available on biological and methodological factors affecting their levels. Design  Three monocyte subsets, CD14(++)  CD16(-)  CCR2+ (Mon1), CD14(++)  CD16(+)  CCR2(+)  (Mon2), CD14(+)  CD16(+)  CCR2(-) (Mon3), and monocyte-platelet aggregates (MPAs) were analysed by flow cytometry. The effects of treadmill exercise were assessed on 12 healthy volunteers. Diurnal variation was evaluated in 16 healthy volunteers, and the effects of delayed blood processing were measured in 12 samples. Results  Mon1 were increased when measured 15 min after exercise followed by a reduction at 1 h (P < 0·05 for both). MPAs were significantly reduced at 15 min and 1 h (P < 0·05 for both). There was significant diurnal variation in the numbers of Mon2, which were highest at 6 pm and lowest at 6 am. There were also significant diurnal variations in phagocytic activity of Mon1 and Mon2, which were highest at 12 pm and lowest at 12 am. Monocyte counts remained stable up to 2 h after venipuncture. MPAs were significantly increased at 2 h and increased further by 4 h after sampling. Conclusions  Monocyte subset Mon2 and monocyte phagocytic activity undergo significant diurnal variation. A single bout of exercise causes a temporal increase in monocytes and a reduction in MPAs. Monocyte subset counts should be analysed within 2 h of blood sampling, whereas measurement of MPAs and monocyte CD14 and CD16 expression should be performed within 1 h.
Eduard Shantsila; Luke D Tapp; Benjamin J Wrigley; Silvia Montoro-Garcia; Angie Ghattas; Anthony Jaipersad; Gregory Y H Lip
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-7
Journal Detail:
Title:  European journal of clinical investigation     Volume:  -     ISSN:  1365-2362     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0245331     Medline TA:  Eur J Clin Invest     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors. European Journal of Clinical Investigation © 2012 Stichting European Society for Clinical Investigation Journal Foundation.
University of Birmingham Centre for Cardiovascular Sciences, City Hospital, Birmingham B18 7QH, UK.
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