Expression of cytochromes P450 4F4 and 4F5 in infection and injury models of inflammation.
Lipopolysaccharide (LPS) treatment of rats suppresses CYP 4F4 and 4F5 expression by 50 and 40%, respectively, in a direct fashion occurring in the liver. This contention is borne out by essentially parallel dose-dependent changes observed upon treatment of rat hepatocyte cultures with LPS. An alternate avenue of triggering the inflammatory cascade is traumatic brain injury by controlled cortical impact. Such injury brings about a dramatic change in the expression of CYP 4F4 and 4F5 mRNA which reaches its greatest effect 24 h after impact compared with sham-operated but uninjured controls. At time points after 24 h the expression of both isoforms increases dramatically reaching highest levels at 2 weeks post-injury. These changes in mRNA expression are mirrored by changes in protein expression. The results are consistent with the notion that immediately after injury concentrations of leukotriene and prostaglandin mediators are elevated by decreased CYP 4F concentrations. As time after injury increases those conditions reverse. Increased CYP 4F expression leads to diminished concentrations of leukotriene and prostaglandin mediators and then to recovery and repair.
Cui
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Department of Biochemistry and Molecular Biology, The University of Texas-Houston Medical School, P.O. Box 20708, 6431 Fannin Street, Houston, TX 77225, USA.
Kalsotra
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A
Robida
A M
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Matzilevich
D
D
Moore
A N
AN
Boehme
C L
CL
Morgan
E T
ET
Dash
P K
PK
Strobel
H W
HW
D000818:Animals; D016718:Arachidonic Acid / Q000378:metabolism; D001930:Brain Injuries / Q000201:enzymology; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000235:genetics; D000072470:Cytochrome P450 Family 4; D004195:Disease Models, Animal; D015971:Gene Expression Regulation, Enzymologic; D006624:Hippocampus / Q000201:enzymology; D007239:Infections / Q000139:chemically induced / Q000201:enzymology*; D007249:Inflammation / Q000139:chemically induced / Q000201:enzymology*; D008070:Lipopolysaccharides; D008099:Liver / Q000201:enzymology*; D008297:Male; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D011916:Rats, Inbred F344; D013997:Time Factors
D008070:Lipopolysaccharides; D012333:RNA, Messenger; D016718:Arachidonic Acid; D003577:Cytochrome P-450 Enzyme System; C465481:Cyp4f4 protein, rat; C465482:Cyp4f5 protein, rat; D000072470:Cytochrome P450 Family 4