• Korean Journal of Food Science and Technology
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• v.39 no.2
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• pp.209-216
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• 2007

The present study investigated anti-oxidative and anti-inflammatory activity of glycoprotein isolated from Morus Indica Linne (MIL glycoprotein). We found that MIL glycoprotein has a molecular weight of 32 kD and consists of carbohydrate (40.03%) and protein (59.97%), and that it has a strong scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH), hydroxyl radical $({\cdot}OH)$, and superoxide anion $(O_2{\cdot}\;^-)$ radicals. In addition, MIL glycoprotein had a stable character and an optimal DPPH radical scavenging activity in the alkaline and neutral pH solution, and up to at 105. However, the results indicated that it has a minimal scavenging activity in the metal ionic solution ($Ca^{2+}$, $Mn^{2+}$, and $Mg^{2+}$) in the presence of EDTA. In addition, we further investigated whether MIL glycoprotein scavenges oxygen radicals and blocks inflammation-related signals in the bisphenol A (BPA)-stimulated Raw 264.7 cells. The results in this study showed that it has a character to scavenge the productions of reactive oxygen species (ROS) and nitric oxide (NO) dose-dependently. Also it blocked the activities of inflammation-related signals such as nuclear factor-kappa B ($NF-{\kappa}B$) and inducible nitric oxide synthase (iNOS). For example, it had an inhibitory effect on the activation of $NF-{\kappa}B$ (p50) and iNOS proteins at 200 ${\mu}g/mL$ MIL glycoprotein. Here, we speculate that MIL glycoprotein is one of natural antioxidants and of modulators of the BPA-induced inflammation.

• Journal of Life Science
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• v.28 no.7
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• pp.841-848
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• 2018

The flavonoid content and antioxidant effects of extracts from Stachys sieboldii Miq. and Lycopus lucidus Turcz were compared. The flavonoid content of the acetone + methylene chloride (A+M) extract of L. lucidus Turcz was 233.2 mg/g, suggesting that the extract was greater than that of S. sieboldii Miq. In the DPPH assay and the A+M and methanol (MeOH) extracts from L. lucidus Turcz had greater scavenging effects than those of S. sieboldii Miq. (p<0.05). The A+M extract from L. lucidus Turcz (0.5 mg/ml concentration) had an 82% scavenging effect in the DPPH assay. In the ABTS assay, A+M extracts from both S. sieboldii Miq. and L. lucidus Turcz (0.5 mg/ml concentration) had scavenging effects of 90% and 88%, respectively (p<0.05), suggesting that both A+M extracts had greater scavenging effects than those of both MeOH extracts. In a 120 min ROS production assay, all tested extracts dose-dependently decreased the cellular ROS production that was induced by $H_2O_2$, as compared to those produced by exposure to the extract-free control. The A+M extracts from both S. sieboldii Miq. and L. lucidus Turcz had greater inhibitory effects on cellular ROS production than those of both MeOH extracts at all concentrations tested. Treatment with the A+M extracts from S. sieboldii Miq. and L. lucidus Turcz (0.25 mg/ml concentration) inhibited the cellular ROS production by 60% and 86%, respectively. These results suggest that the A+M extracts of Stachys sieboldii Miq. and L. lucidus Turcz inhibit cellular oxidation and may contain valuable bioactive compounds, such as flavonoids.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.35 no.4
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• pp.287-292
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• 2009

Human skin is constantly exposed to environmental irritants such as smoke, chemicals and ultraviolet (UV). Free radicals and reactive oxygen species (ROS) caused by these environmental irritants play critical roles in cellular damage. In this study, to investigate the skin cell protective effect of Ophioglossum vulgatum extract, we investigated its effects on intercellular antioxidative activity and UVA-induced MMP expression in human dermal fibroblasts (HDFs). The dried O. vulgatum was extracted in a mixture of ethanol and water (1 : 1) for 24 h at room temperature. The extract was filtered and concentrated in vacuo and lyophilized. For testing intracellular ROS scavenging activity the cultured HDFs were analyzed by increase in DCF fluorescence upon exposure to UVB $20\;mJ/cm^2$. After treatment of O. vulgatum extracts, intracellular ROS levels were measured by luminescence spectrophotometer. Enzyme linked immuno sorbent assay (ELISA), and RT-PCR techniques were used for evaluating the effects of O. vulgatumon on MMP protein and mRNA expression in UVA irradiated HDFs. O. vulgatum extract was found to have ROS scavenging activity with the $IC_{50}$ values of $18.2\;{\mu}g/mL$ against superoxide radicals in the xanthine/xanthine oxidase system. After treatment of O. vulgatum extracts, the oxidation of CM-DCFDA was inhibited effectively and O. vulgatum extracts showed a potent free radical scavenging activity by 30.4 % at $100\;{\mu}g/mL$ in UVB-irradiated HDFs. UVA induced MMP protein expression was reduced 37.7 % by treatment with O. vulgatum extract, and MMP-1 mRNA expression was reduced in a dose-dependent manner. Taken together, these results suggest that O. vulgatum extract prevents the skin cell damage induced by UV irradiation, and implies that O. vulgatum extract may be useful as a new ingredient for anti-aging cosmetics.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.37 no.3
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• pp.257-264
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• 2011

In this study, to evaluate the antioxidative activities and anti-inflammatory effects of kaempferol and its rhamnosides, we performed the free radical scavenging assay, ROS inhibition assay and TARC (thymus and activation-regulated chemokine) assay. Also, we studied physiological activity of kaempferol and its rhamnosides (${\alpha}$-rhamnoisorobin, afzelin, kaempferitn) by structure-activity relations. The free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) scavenging activities were determined with kaempferol (62.5 ${\mu}M$) and ${\alpha}$-rhamnoisorobin (50.0 ${\mu}M$) but afzelin and kaempferitrin did not show free radical scavenging activities. Kaempferol showed a 97.5, 57.8, 47.8 % inhibition of ROS (reactive oxygen species) generated at concentrations of 10, 50 and 100 ${\mu}M$, compared to control (100 %). ${\alpha}$-rhamnoisorobin showed a 93.1, 59.1 and 41.4 % inhibition of ROS at the same concentration. We investigated the inhibitory effects of kaempferol and its rhamnosides on TARC expression. Kaempferol showed a 48.8, 5.5 and 4.4 % inhibition of TARC generated at 10, 50 and 100 ${\mu}M$, compared to control. ${\alpha}$-Rhamnoisorobin showed a 88.1, 19.0 and 1.0 % inhibition of TARC generated at the same concentration. In conclusion, these results indicate that kaempferol and ${\alpha}$-rhamnoisorobin have good antioxidative activities and anti-inflammatory effects that could be applicable to new functional cosmetics for anti-aging and anti-inflammation.

• Journal of Life Science
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• v.29 no.11
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• pp.1273-1280
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• 2019

Age-related macular degeneration (AMD) is one of the leading causes of blindness in the elderly population, and damage to retinal pigment epithelial (RPE) cells due to oxidative stress contributes to the development of AMD. Glycyrrhiza uralensis Fischer is one of the most widely used herbal medicines for the treatment of various diseases in Asian countries. Although recent studies indicated that treatment with G. uralensis can protect cells from oxidative stress, its mechanisms in RPE cells remain unknown. We evaluated the effect of a G. uralensis ethanol extract (GU) on $H_2O_2$-induced oxidative injury in ARPE-19 RPE cells. The GU pretreatment attenuated reactive oxygen species (ROS) generation induced by $H_2O_2$, which was associated with induced expression of nuclear factor erythroid-derived-2-like 2 (Nrf2) and heme oxygenase-1 (HO-1). GU also suppressed $H_2O_2$-induced DNA damage and mitochondrial dysfunction. The inhibitory effect of GU on $H_2O_2$-induced apoptosis was associated with the protection of caspase-3 activation. Overall, GU appeared to protect RPE cells from oxidative injury by inhibiting DNA damage and reducing apoptosis. Further studies are needed to determine the regulation of Nrf2-mediated HO-1 expression, but our results suggest the possibility of using GU to reduce the risk of AMD.

• Journal of Life Science
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• v.31 no.2
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• pp.126-136
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• 2021

Oxidative stress causes injury to and degeneration of retinal pigment epithelial (RPE) cells. It is involved in several retinal disorders and leads to vision loss. In the present study, we investigated the effect of 14 kinds of natural compounds and two kinds of synthetic compounds on oxidative stress-induced cellular damage in human PRE cell lines (ARPE-19). From among them, we selected five kinds of compounds, including auranofin, FK-509, hemistepsin A, honokiol, and spermidine, which have inhibitory effects against hydrogen peroxide (H2O2)-mediated cytotoxicity. In addition, we found that four kinds of compounds (excluding auranofin) have protective effects on H2O2-induced mitochondrial dysfunction. Furthermore, the expression of phosphorylation of histone H2AX, a sensitive marker of DNA damage, was markedly up-regulated by H2O2, whereas it was notably down-regulated by FK-506, honokiol, and spermidine treatment. Meanwhile, five kinds of candidate compounds had no effect on H2O2-induced intracellular reactive oxygen species (ROS) levels, suggesting that the five candidate compounds have protective effects on oxidative stress-induced cellular damage through the ROS-independent pathway. Taken together, according to the results of H2O2-mediated cellular damage―such as cytotoxicity, apoptosis, mitochondrial dysfunction, and DNA damage―spermidine and FK-506 are the natural and synthetic compounds with the most protective effects against oxidative stress in RPE. Although further studies on the identification of the mechanism responsible are required, the results of the present study suggest the possibility of using spermidine and FK-506 to suppress the risk of retinal disorders.

• Food Science and Preservation
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• v.31 no.1
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• pp.183-196
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• 2024

This study investigated the protective effect of the aqueous extract of Eucommia ulmoides leaves (AEEL) against high glucose-induced human colon epithelial HT-29 cells. The 2,2'-azino-bis (3-ethyl benzothiazoline-6-sulfonic acid) (ABTS), 1,1-diphenyl-2-picrylhydrazy (DPPH) radical scavenging activities, ferric reducing/antioxidant power (FRAP), and malondialdehyde (MDA) analyses indicated that AEEL had significant antioxidant activities. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay showed that AEEL increased cell viability against high glucose-, H₂O₂-, and lipopolysaccharide (LPS)-induced cytotoxicity in HT-29 cells. Also, the 2'-7'-dichlorodihydrofluorescein diacetate (DCF-DA) assay indicated that AEEL decreased intracellular reactive oxygen species (ROS) against high glucose-, H₂O₂-, and lipopolysaccharide (LPS)-induced cytotoxicity in HT-29 cells. AEEL showed inhibitory activities against α-glucosidase and inhibited the formation of advanced glycation end products (AGEs). AEEL showed significant positive effects on the viability and titratable acidity of L. brevis. The high-performance liquid chromatogram (HPLC) analysis identified chlorogenic acid and rutin as the major compounds of AEEL. These results suggested that AEEL has the potential to be used as a functional food source to suppress blood glucose levels and protect the gut from high glucose-induced oxidative stress.