Differential immunoresponses following experimental traumatic brain injury, bone fracture and "two-hit"-combined neurotrauma.
OBJECTIVE
Cytokine-mediated immunoresponses are consequences of isolated traumatic brain injury (TBI) and muskuloskeletal trauma but little is known when both impacts occur simulanteously in combined neurotrauma (CNT), i. e. TBI + muskuloskeletal trauma (bone fracture).


METHODS
A "two-hit"-experimental model of CNT (TBI + tibia fracture) was used to investigate circulating cytokine interleukin-1-beta, -6, -10 and sTNF-R1 concentrations following peripheral bone fracture only, TBI only and CNT. Blood samples were drawn at 30 min, 6 h, 24 h, 48 h, and 7 days following trauma and circulating cytokine concentrations were determined via immunoassay.


RESULTS
Circulating cytokines were increased after trauma (p <0.001 vs. controls), but peaked at different time points. sTNF R1 peaked first at 30 min, followed by IL-6 at 6 h after trauma. IL-10 levels were highest at 24 h, and those for IL-1beta at 48 h after trauma. Circulating IL-6 and IL-10 levels were highest in CNT at 8/10 time points studied (p <0.001).


CONCLUSIONS
Circulating cytokine IL-1-beta, -6, -10 and sTNF-R1 concentrations are increased after trauma (TBI, fracture and CNT) but peak at different time points. Pronounced IL-6 and IL-10 responses after CNT may contribute to the increased susceptibility for complications in CNT versus monotrauma.
Institute for Research in Operative Medicine (IFOM), University of Witten-Herdecke, Ostmerheimerstr. 200, D-51109 Cologne, Germany. Marc.Maegele@t-online.de
M
M
Maegele
S
S
Sauerland
B
B
Bouillon
U
U
Schäfer
H
H
Trübel
P
P
Riess
E A M
EA
Neugebauer
D000818:Animals; D001930:Brain Injuries / Q000276:immunology*; D016753:Interleukin-10 / Q000097:blood; D015850:Interleukin-6 / Q000097:blood; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000097:blood; D013978:Tibial Fractures / Q000276:immunology*; D014916:Whole-Body Irradiation
D015850:Interleukin-6; D047888:Receptors, Tumor Necrosis Factor, Type I; D016753:Interleukin-10