Formation of microparticles in the injured brain of patients with severe isolated traumatic brain injury.

Abstract:

:The potential pathophysiological role of circulating microparticles (MPs) has been recognized in various conditions, such as cardiovascular and thrombotic diseases. Traumatic brain injury (TBI) has a complex pathophysiology that involves coagulopathy and inflammation. We investigated endothelial-, platelet-, and leukocyte-derived microparticles (EMPs, PMPs, and LMPs, respectively) in 16 patients with severe isolated TBI. Arterial and cerebrovenous samples were taken repeatedly, during 1-72 h after injury. Subpopulations of MPs, exposing tissue factor (TF) and P-selection, were also studied. MP counts in cerebrovenous samples, irrespective of cellular origin, were higher in TBI cases, compared to healthy controls (peak levels of EMPs were approximately 7 times higher, PMPs 1.4 times higher, and LMPs 2 times higher, respectively; p<0.001 for all). MP counts declined sharply from high levels shortly after the trauma toward slightly elevated levels 72 h later. EMPs and PMPs exposing TF, as well as PMPs exposing P-selection, showed a transcranial gradient with higher concentration in cerebrovenous, compared to arterial, samples. In contrast, LMPs exposing TF were higher in arterial samples, suggesting accumulation of LMPs in the brain. We conclude that the pattern of circulating MPs is altered after TBI. PMPs exposing P-selection and EMPs exposing TF seem to be generated in the injured brain, whereas LMPs exposing TF are accumulated. The pathophysiological significance of these changes in MP pattern in TBI should be further investigated. Including MPs exposing brain-specific antigens in the assessment of brain injury would give further information of origin and likely give additional information of the size of the injury, given that the MP phenotypes investigated in the present study are not brain-specific markers.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Nekludov M,Mobarrez F,Gryth D,Bellander BM,Wallen H

doi

10.1089/neu.2013.3168

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

1927-33

issue

23

eissn

0897-7151

issn

1557-9042

journal_volume

31

pub_type

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