IL-10 polymorphism associated with decreased risk for mortality after burn injury.
OBJECTIVE
Evaluation of single nucleotide polymorphisms (SNPs) in the interleukin-10 promoter (-592 and -819) on risk for death after burn injury.


METHODS
Association between the IL-10 SNPs and outcome after burn injury was evaluated in a cohort of 265 patients from Parkland Hospital, Dallas, TX with ≥ 15% TBSA burns without non-burn trauma (ISS ≤ 16), traumatic or anoxic brain injury or spinal cord injury, who survived >48 h under an IRB-approved protocol. Clinical data were collected prospectively and genotyping was conducted by TaqMan assay. Whole blood from 31 healthy volunteers was stimulated with LPS (100 ng/mL) to determine the level of IL-10 expression for each allele by enzyme-linked immunosorbent assay (ELISA).


RESULTS
After adjustment for percent total body surface area (TBSA) burned, inhalation injury, age, gender, and race/ethnicity, carriage of ‑592A and/or ‑819T was significantly associated (P = 0.014) with a decreased risk for death (adjusted odds ratio: 0.404; 95% CI: 0.197-0.829). As the candidate SNPs were in complete linkage disequilibrium, it was not possible to distinguish which allele was associated with decreased mortality risk. Age, inhalation injury, and full-thickness burn size were significantly associated with increased risk for death. In the LPS stimulated blood of healthy controls, carriage of the -592A and/or -819T allele demonstrated a trend for decreased levels of IL-10 (P = 0.079).


CONCLUSIONS
Carriage of the ‑592A and/or ‑819T allele in the IL-10 promoter appears to reduce the risk for death after burn injury.
Huebinger
Ryan M
RM
Department of Surgery, The University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Rivera-Chavez
Fernando
F
Chang
Ling-Yu
LY
Liu
Ming-Mei
MM
Minei
Joseph P
JP
Purdue
Gary F
GF
Hunt
John L
JL
Arnoldo
Brett D
BD
Barber
Robert C
RC
D000328:Adult; D002056:Burns / Q000235:genetics* / Q000401:mortality*; D015331:Cohort Studies; D005260:Female; D005838:Genotype; D006801:Humans; D002534:Hypoxia, Brain / Q000401:mortality; D016753:Interleukin-10 / Q000235:genetics*; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D011401:Promoter Regions, Genetic / Q000235:genetics; D012307:Risk Factors; D013119:Spinal Cord Injuries / Q000401:mortality; D055815:Young Adult
C508609:IL10 protein, human; D016753:Interleukin-10