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2010 ; 1
(ä): 111
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Magnesium Lithospermate B Protects Cardiomyocytes from Ischemic Injury Via
Inhibition of TAB1-p38 Apoptosis Signaling
#MMPMID21607062
Du CS
; Yang RF
; Song SW
; Wang YP
; Kang JH
; Zhang R
; Su DF
; Xie X
Front Pharmacol
2010[]; 1
(ä): 111
PMID21607062
show ga
Danshen has been used in traditional Chinese medicine for hundreds of years to
treat cardiovascular diseases. However, its precise cardioprotective components
and the underlying mechanism are still unclear. In the present study, we
demonstrated that in a rat model of acute myocardial infarction, the treatment
with magnesium lithospermate B (MLB), the representative component of phenolic
acids in Danshen, significantly reduced the infarct size and the blood lactate
dehydrogenase level. In contrast, tanshinone IIA, the representative component of
lipophilic tanshinones in Danshen, had no such protective effects. Moreover, in
the simulated ischemia cell model, MLB treatment considerably increased the cell
viability and reduced the sub-G1 population and the apoptotic nuclei, indicating
its anti-apoptotic effect. Further mechanism study revealed that the
ischemia-induced p38 phosphorylation was abolished by MLB treatment.
Interestingly, MLB specifically inhibited the TGF?-activated protein kinase
1-binding protein 1 (TAB1) mediated p38 phosphorylation through disrupting the
interaction between TAB1 and p38, but it did not affect the mitogen-activated
protein kinase 3/6 mediated p38 phosphorylation. In conclusion, the present study
identifies MLB as an active component of Danshen in protecting cardiomyocytes
from ischemic injury through specific inhibition of TAB1-p38 apoptosis signaling.
These results indicate TAB1-p38 interaction as a putative drug target in treating
ischemic heart diseases.