Protective effect of JBP485 on concanavalin A-induced liver injury in mice.
OBJECTIVE
Cyclo-trans-4-l-hydroxyprolyl-l-serine (JBP485) was first isolated from Laennec (hydrolysate of human placenta). We thought it valuable to clarify the anti-hepatitis molecular mechanism of JBP485 to develop a new oral anti-hepatitis drug.


METHODS
We investigated the hepatoprotective effect of JBP485 on immune-mediated, concanavalin A (Con A)-induced liver injury in mice. Mice were administered JBP485 before and after injection of Con A (10 mg/kg). Eight hours after Con A, the cytosolic enzyme activity (alanine aminotransferase, lactate dehydrogenase) in serum, and the enzyme activity or concentration (superoxide dismutase, maleic dialdehyde, myeloperoxidase, nitric oxide) in liver homogenate were determined. The liver slices were investigated to observe changes in histology. The effect of JBP485 on level of tumour necrosis factor-alpha (TNF-alpha) and intercellular adhesion molecule-1 (ICAM-1) in liver were detected by immunohistochemistry. Hepatocyte DNA fragmentation was assayed by agarose gel electrophoresis and the transcription of the genes bax and bcl-2 in hepatocytes was determined by reverse transcription-polymerase chain reaction.


RESULTS
Con A increased the cytosolic and liver homogenate enzyme activity, and the concentrations of ICAM-1 and TNF-alpha, which were significantly inhibited by JBP485 administration. Also, the increase in DNA fragmentation and decrease in bcl-2/bax mRNA induced by Con A administration were significantly inhibited by JBP485.


CONCLUSIONS
These results indicated that immune-mediated liver damage can be prevented by JBP485, and that this is mainly associated with immunomodulatory effects on T cells and adhesion molecules, antioxidation, and inhibition of apoptosis.
Yang
Tao
T
College of Pharmacy, Dalian Medical University, Dailian, Liaoning, China.
Wu
Jingjing
J
Wang
Changyuan
C
Liu
Qi
Q
Ma
Xiaochi
X
Peng
Jinyong
J
Kaku
Taiichi
T
Liu
Kexin
K
D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D056486:Chemical and Drug Induced Liver Injury / Q000276:immunology / Q000473:pathology / Q000517:prevention & control*; D003208:Concanavalin A; D003600:Cytosol / Q000187:drug effects / Q000201:enzymology; D053938:DNA Fragmentation; D004587:Electrophoresis, Agar Gel; D005260:Female; D022781:Hepatocytes / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D007150:Immunohistochemistry; D007155:Immunologic Factors / Q000494:pharmacology*; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D010456:Peptides, Cyclic / Q000494:pharmacology*; D020011:Protective Agents / Q000494:pharmacology*; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D007155:Immunologic Factors; C412308:JBP 485; D010456:Peptides, Cyclic; D020011:Protective Agents; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D003208:Concanavalin A; D018799:Intercellular Adhesion Molecule-1