Proteomic change of peripheral lymphocytes from scald injury and Pseudomonas aeruginosa sepsis in rabbits.
BACKGROUND
Increased susceptibility to infection has been related to impairment of lymphocyte-regulated immune responses after severe burn. The aim of this study is to identify the differential expression of proteins in circulating lymphocytes from scald injury and Pseudomonas aeruginosa sepsis in rabbits to provide a basis for pathogenesis of burns and sepsis.


METHODS
Rabbits were subjected to sham burn (A), 30% scald (B), A+bacterial challenge (C) or B+bacterial challenge (D). Bacterial challenge was inflicted by an injection of 2.0x10(8) CFU P. aeruginosa (ATCC27853) in the auricular vein 22 h after the burn procedure. The animals were sacrificed 24 h later. Lymphocytes were isolated, and the differential proteins in the lymphocytes from the experimental and control animals were identified by two-dimensional electrophoresis (2-DE) coupled with matrix-assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI-TOF-MS), two of which were confirmed by Western blotting.


RESULTS
Nineteen differential protein spots were found by 2-DE and 12 spots (11 proteins) were identified. Differential expression of peroxiredoxin and annexin I was validated by Western blotting. Among the identified proteins, the expression levels of cofilin, cyclophilin A, ubiquitin, nucleoside diphosphate kinase, glutamate dehydrogenase and annexin I were down-regulated in group B, excessively down-regulated in group D, but mildly in group C, and peroxiredoxin was up-regulated in groups B and D.


CONCLUSIONS
Proteome changes in lymphocytes from P. aeruginosa sepsis in the scalded rabbits were revealed, which are related to immune suppression and the pathogenesis of sepsis after scald injury.
Department of Burns and Plastic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, PR China.
Pi-hong
PH
Zhang
Liu-rong
LR
Yang
Li-li
LL
Li
Ji-zhang
JZ
Zeng
Li-cheng
LC
Ren
Peng-fei
PF
Liang
Xiao-yuan
XY
Huang
D000818:Animals; D001798:Blood Proteins / Q000378:metabolism*; D015153:Blotting, Western / Q000379:methods; D002056:Burns / Q000276:immunology* / Q000382:microbiology; D007108:Immune Tolerance; D008214:Lymphocytes / Q000378:metabolism*; D008297:Male; D040901:Proteomics / Q000379:methods; D011552:Pseudomonas Infections / Q000276:immunology*; D011550:Pseudomonas aeruginosa; D011817:Rabbits; D018805:Sepsis / Q000276:immunology; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods
D001798:Blood Proteins