Cross-linked bromelain inhibits lipopolysaccharide-induced cytokine production involving cellular signaling suppression in rats.
Bromelain has been reported to have anti-inflammatory and immunomodulatory effects. It has been cross-linked with organic acids and polysaccharides by gamma irradiation. The cross-linked (CL)-bromelain preparation resisted an acidic environment of pH 3 for 2 h and preserved 80% of its enzyme activity. Pretreatment of rats with CL-bromelain intragastrically for 7 days significantly reduced serum cytokine production induced by injected i.p. with 2.5 mg/kg of lipopolysaccharide (LPS). Bromelain significantly reduced serum glutamate-oxalacetate transaminase induced by LPS. The anti-inflammatory effect of CL-bromelain was correlated with reduced LPS-induced NF-kappaB activity and cyclooxygenase 2 (COX-2) mRNA expression in rat livers. In addition, CL-bromelain dose-dependently inhibited LPS-induced COX-2 mRNA and prostaglandin E2 (PGE2) in BV-2 microglial cells. CL-Bromelain also suppressed the LPS-activated extracellular signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and p38 mitogen-activated protein kinase (MAPK). In conclusion, the anti-inflammatory effects of the CL-bromelain preparation in vivo and in vitro suggest its therapeutic potentials.
Jen-Teh Junior College of Medical and Nursing Management, Miaoli, Taiwan, Republic of China.
Rolis Chien-Wei
RC
Hou
Yuh-Shuen
YS
Chen
Jing-Rong
JR
Huang
Kee-Ching G
KC
Jeng
D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D001963:Bromelains / Q000737:chemistry* / Q000494:pharmacology*; D003432:Cross-Linking Reagents; D051546:Cyclooxygenase 2 / Q000235:genetics; D016207:Cytokines / Q000096:biosynthesis* / Q000097:blood; D015232:Dinoprostone / Q000378:metabolism; D004789:Enzyme Activation / Q000187:drug effects; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008297:Male; D008855:Microscopy, Electron, Scanning; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction / Q000187:drug effects*
D000894:Anti-Inflammatory Agents, Non-Steroidal; D003432:Cross-Linking Reagents; D016207:Cytokines; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D001963:Bromelains; D051546:Cyclooxygenase 2; D020928:Mitogen-Activated Protein Kinases; D015232:Dinoprostone