title: The cytokine response to human traumatic brain injury: temporal profiles and evidence for cerebral parenchymal production.
abstract: The role of neuroinflammation is increasingly being recognised in a diverse range of cerebral pathologies, including traumatic brain injury (TBI). We used cerebral microdialysis and paired arterial and jugular bulb plasma sampling to characterise the production of 42 cytokines after severe TBI in 12 patients over 5 days. We compared two microdialysis perfusates in six patients: central nervous system perfusion fluid and 3.5% human albumin solution (HAS); 3.5% HAS has a superior fluid recovery (95.8 versus 83.3%), a superior relative recovery in 18 of 42 cytokines (versus 8 of 42), and a qualitatively superior recovery profile. All 42 cytokines were recovered from the human brain. Sixteen cytokines showed a stereotyped temporal peak, at least twice the median value for that cytokine over the monitoring period; day 1: tumour necrosis factor, interleukin (IL)7, IL8, macrophage inflammatory protein (MIP)1α, soluble CD40 ligand, GRO, IL1β, platelet derived growth factor (PDGF)-AA, MIP1β, RANTES; day 2: IL1 receptor antagonist (ra). IL6, granulocyte-colony stimulating factor (G-CSF), chemokine CXC motif ligand 10 (IP10); days 4 to 5: IL12p70, IL10. Brain extracellular fluid concentrations were significantly higher than plasma concentrations for 19 cytokines: basic fibroblast growth factor (FGF2), G-CSF, IL1α, IL1β, IL1ra, IL3, IL6, IL8, IL10, IL12p40, IL12p70, IP10, monocyte chemotactic protein (MCP)1, MCP3, MIP1α, MIP1β, PDGF-AA, transforming growth factor (TGF)α and vascular endothelial growth factor. No clear arterio-jugular venous gradients were apparent. These data provide evidence for the cerebral production of these cytokines and show a stereotyped temporal pattern after TBI.
authors: Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK. adelhelmy@cantab.net
authors: Adel
authors: A
authors: Helmy
authors: Keri L H
authors: KL
authors: Carpenter
authors: David K
authors: DK
authors: Menon
authors: John D
authors: JD
authors: Pickard
authors: Peter J A
authors: PJ
authors: Hutchinson
mesh_terms: D001923:Brain Chemistry / Q000502:physiology; D001930:Brain Injuries / Q000378:metabolism* / Q000473:pathology*; D000077324:Crystalloid Solutions; D016207:Cytokines / Q000096:biosynthesis* / Q000097:blood; D004058:Diffusion; D018450:Disease Progression; D015600:Glasgow Coma Scale; D006801:Humans; D007552:Isotonic Solutions; D007601:Jugular Veins / Q000502:physiology; D017551:Microdialysis; D010952:Plasma Substitutes; D012709:Serum Albumin; D013997:Time Factors
chemical_list: D000077324:Crystalloid Solutions; D016207:Cytokines; D007552:Isotonic Solutions; D010952:Plasma Substitutes; D012709:Serum Albumin