Abstract:
:Activation of extracellular signal-related kinase (ERK) is involved in decreased melanogenesis by sphingosylphosphorylcholine (SPC). In the present study, we confirmed that SPC activated ERK and that a specific inhibitor of the ERK pathway (PD98059) recovered SPC-induced hypopigmentation. Moreover, we found that SPC significantly reduces protein phosphatase 2A (PP2A) activity in Mel-Ab cells, and that PP2A activator treatment abrogated SPC-induced hypopigmentation. We determined that α-melanocyte-stimulating hormone (α-MSH) increased the expression of dual-specificity phosphatase 6 (DUSP6), an ERK phosphatase, in a time-dependent manner. In contrast, SPC decreased the level of DUSP6 in Mel-Ab cells. Furthermore, inhibiting DUSP6 increased ERK activation and subsequently augmented the SPC-induced hypopigmenting effects. Taken together, our data suggest that SPC-induced phosphatase inhibition is also responsible for the hypopigmentary effects.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Jeong HS,Park KC,Kim DSdoi
10.1007/s11010-012-1317-8subject
Has Abstractpub_date
2012-08-01 00:00:00pages
43-9issue
1-2eissn
0300-8177issn
1573-4919journal_volume
367pub_type
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