|
KMID : 0620720090150010032
|
|
Natural Product Sciences
2009 Volume.15 No. 1 p.32 ~ p.36
|
|
|
Effects of Curcumin, the Active Ingredient of Turmeric(Curcuma longa), on Regulation of Glutamate-induced Toxicity and Activation of the Mitogen-activated Protein Kinase Phosphatase-1 (MKP-1) in HT22 Neuronal Cell
|
|
Lee Sang-Hyun
Yun Young-Gab
|
|
|
Abstract
|
|
|
|
Glutamate causes neurotoxicity through formation of reactive oxygen species and activation of mitogen-activated protein kinase (MAPK) pathways. MAPK phosphatase-1 (MKP-1) is one of the phosphatases responsible for dephosphorylation/deactivation of three MAPK families: the extracellular signal-regulated kinase-1/2 (ERK-1/2), the c-Jun N-terminal kinase-1/2 (JNK-1/2), and the p38 MAPK. In this report, the potential involvement of MKP-1 in neuroprotective effects of curcumin, the active ingredient of turmeric (Curcuma longa), was examined using HT22 cells. Glutamate caused cell death and activation of ERK-1/2 but not p38 MAPK or JNK-1/2. Blockage of ERK-1/2 by its inhibitor protected HT22 cells against glutamate-induced toxicity. Curcumin attenuated glutamate-induced cell death and ERK-1/2 activation. Interestingly, curcumin induced MKP-1 activation. In HT22 cells transiently transfected with small interfering RNA against MKP-1, curcumin failed to inhibit glutamate-induced ERK-1/2 activation and to protect HT22 cells from glutamate-induced toxicity. These results suggest that curcumin can attenuate glutamate-induced neurotoxicity by activating MKP-1 which acts as the negative regulator of ERK-1/2. This novel pathway may contribute to and explain at least one of the neuroprotective actions of curcumin.
|
|
|
KEYWORD
|
|
|
Curcumin, Glutamate, Mitogen-activated protein kinase, Mitogen-activated protein kinase phosphatase-1
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|