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http://dx.doi.org/10.5352/JLS.2020.30.10.867

The Effect of Magnolol on UVB-induced Inflammation Damage Control via the Nrf2-SOCS3-Jak2-STAT3 Pathway in Human Dermal Fibroblasts  

Nam, Young sun (Hwaseong Shingyeong University, Department of Beauty Design)
Ji, Juree (CIVASAN)
Publication Information
Journal of Life Science / v.30, no.10, 2020 , pp. 867-876 More about this Journal
Abstract
This study investigated the repair of UVB-induced cell damage by magnolol. We performed a drug-repurposing screen, and, in the STAT3 reporter gene assay, magnolol was identified as a suppressor of STAT3 that improves the cell viability of HDF cells. HDF cells treated with IL-6, UVB, and IFNγ showed the highest expression of Jak2 and phosphorylated STAT3 (p-STAT3), and magnolol was able to decrease the expression of Jak2 and p-STAT3 in UVB-induced cells. Moreover, UVB-damaged cell growth increased significantly in correlation with both reactivation and with magnolol in a dose-dependent manner. Compared with AG490 (a Jak2 inhibitor) treatment of UVB-treated HDF cells, cell proliferation increased significantly. We confirmed that AG490 and magnolol reduced TNF-α concentrations, and Western blotting (protein level) showed decreases in Jak2 and p-STAT3 expression in only the magnolol-treated cells. The expression of Jak2, p-STAT3, and SOCS3 also increased only after treatment with magnolol. Cells were treated with magnolol and ML385 (an NRF2 inhibitor), and these secondary metabolites reduced cell proliferation and NRF2 expression. The amount of MMP9 was also increased by cotreatment with magnolol and ML385. Collectively, these results demonstrate the potential of magnolol for repairing cells after UVB-induced damage by regulating the expression of NRF2, SOCS3, Jak2, and STAT3.
Keywords
Jak2; magnolol; SOCS3; STAT3; UVB;
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