Burn Injury with Infection Alters Prostaglandin E2 Synthesis and Metabolism

• Published in: The Journal of Trauma: Injury, Infection, and Critical Care Vol. 47; no. 6; p. 1052
• Main Authors: Hahn, Elisabeth L., Tai, Hsin-Hsiung, He, Like K., Gamelli, Richard L.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Baltimore, MD Lippincott Williams & Wilkins, Inc 01-12-1999; Lippincott Williams & Wilkins
• Subjects: Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy; Animals; Biological and medical sciences; Blotting, Northern; Blotting, Western; Burns - complications; Cyclooxygenase 2; Dinoprostone - biosynthesis; Dinoprostone - metabolism; Disease Models, Animal; Emergency and intensive care: burns; Gene Expression Regulation, Enzymologic - genetics; Hydroxyprostaglandin Dehydrogenases - analysis; Hydroxyprostaglandin Dehydrogenases - genetics; Intensive care medicine; Isoenzymes - analysis; Isoenzymes - genetics; Lung - chemistry; Male; Medical sciences; Mice; Mice, Inbred Strains; Prostaglandin-Endoperoxide Synthases - analysis; Prostaglandin-Endoperoxide Synthases - genetics; Pseudomonas Infections - etiology; Pseudomonas Infections - metabolism; Pseudomonas Infections - pathology; Rabbits; Random Allocation; RNA, Messenger - analysis; Transcription, Genetic - genetics; Wound Infection - etiology; Wound Infection - metabolism; Wound Infection - pathology; Pseudomonadales; Pathophysiology; Rodentia; Alteration; Prostaglandin E2; Metabolism; Trauma; Infection; Burn; Sepsis syndrome; Vertebrata; Mammalia; Synthesis; Mouse; Animal; Bacteriosis; Bacteria; Pseudomonadaceae; Pseudomonas aeruginosa
• ISSN: 0022-5282; 1529-8809
• DOI: 10.1097/00005373-199912000-00010

OBJECTIVE:The aim of this study was to examine the relationship between prostaglandin synthesis and prostaglandin degradation in a model of burn injury with infection.
METHODS:Male B2D6F1 mice were assigned to control, burn (16% dorsal scald burn), or burn with infection (burn with topical application of 1,000 colony forming units of Pseudomonas aeruginosa) groups. Lung tissue was harvested at 1, 2, and 3 days after burn injury and subsequently processed for total RNA and protein. Northern and Western blot analyses were used to examine differences in cycooxygenase 2 (COX-2) and prostaglandin 15-OH dehydrogenase (PGDH) protein and mRNA expression. Total RNA was probed with the riboprobe for murine PGDH and COX-2 and the 100,000 g protein fraction was immunoblotted by using an rabbit anti-murine PGDH and anti-murine COX-2 antibody.
RESULTS:COX-2 expression was elevated in the burn with infection animals on day 1 and day 2 after burn injury. At these time points in the burn + infection group, PGDH was significantly depressed. Burn injury increased COX-2 expression on day 1, but by day 2, COX-2 expression had decreased to control values. A corresponding increase in PGDH expression was observed on day 2 in the burned mice. The mRNA expression of COX-2 was followed by a similar increase in COX-2 protein expression at all time points in the injured animals. This was not the case with PGDH expression. On day 1, PGDH mRNA expression was depressed in the burn with infection mice with no change in PGDH protein expression. This finding indicates that PGDH is subject to regulation at both the transcriptional and posttranscriptional levels.
CONCLUSION:Burn wound infection depressed both PGDH mRNA and protein expression and increased COX-2 mRNA and protein expression. Therefore, increases in circulating prostaglandin E2 levels during septic injury are derived from alterations in synthesis and degradation of prostaglandin E2.