• 생약학회지
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• 제44권4호
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• pp.372-378
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• 2013

In this study, the inhibitory effect on advanced glycation end products (AGEs) formation of 43 Korean herbal medicines has been evaluated. Among them, 16 Korean herbal medicines were showed to have significant effect ($IC_{50}$; <50 ${\mu}g/ml$) compared to positive reference, aminoguandine ($IC_{50}$: $76.47{\pm}4.81{\mu}g/ml$). Especially, five herbal medicines, Rubus coreanus (leaves, $IC_{50}$: $4.49{\pm}0.03{\mu}g/ml$), Rubus coreanus (twigs, $IC_{50}$: $3.80{\pm}0.34{\mu}g/ml$), Ampleopsis brevipedunculata (stems, $IC_{50}$: $7.43{\pm}0.09{\mu}g/ml$), Lindera erythrocarpa (leave, $IC_{50}$: $8.14{\pm}0.20{\mu}g/ml$), and Lindera erythrocarpa (stems, $IC_{50}$: $3.69{\pm}0.14{\mu}g/ml$) showed more potent inhibitory activity (approximately 9-20 fold) than the positive control aminoguanidine.

• Biomolecules & Therapeutics
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• 제13권3호
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• pp.190-197
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• 2005

Advanced glycation end products (AGE) have been implicated in the pathogenesis of diabetic complications including nephropathy. However, the role of AGE in the activation of mesangial cells cultured under high glucose has not been elucidated. The effects of aminoguanidine, which prevents formation of AGE and protein cross-linking, on the synthesis of $TGF-{\beta}1$ and fibronectin by rat mesangial cells cultured under high glucose for 2 weeks were examined and compared with the effects of $N^G$-nitro-L-arginine methyl ester (NAME), a selective nitric oxide synthase inhibitor, because aminoguanidine also inhibits the inducible nitric oxide synthase. Culture of mesangial cells in 30 mM (high) glucose for 2 weeks induced 1.5-fold (ELISA) and 1.9-fold (Western blot analysis) increase in AGE in the culture media compared to 5.6 mM (control) glucose. Northern blot analysis revealed 1.5-fold increase in $TGF-{\beta}1$ and 1.7-fold increase in fibronectin mRNA expression in cells cultured under high glucose compared to control glucose. Increases in mRNA expression were followed by increased protein synthesis. Mink lung epithelial cell growth inhibition assay revealed 1.4-fold increase in $TGF-{\beta}1$ protein in high glucose media compared to control. Fibronectin protein also increased 2.1-fold that of control glucose by Western blot analysis. Administration of aminoguanidine suppressed AGE formation in a dose dependent manner and at the same time suppressed $TGF-{\beta}1$ and fibronectin synthesis by mesangial cells cultured in both control and high glucose. In contrast, NAME did not affect high glucose-induced changes. These findings support a role for AGE in high glucose-induced upregulation of $TGF-{\beta}1$ and fibronectin synthesis by mesangial cells.

• 생약학회지
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• 제40권4호
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• pp.382-387
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• 2009

Enhanced formation and accumulation of advanced glycation end products (AGEs) have been implicated as a major pathogenesis process leading to diabetic complications, normal aging, atherosclerosis and Alzheimer's disease. In our ongoing project to discover novel treatments for diabetic complications from natural sources, we have investigated on the inhibitory activity of 67 ethanol extracts from 57 Korean herbal medicines against the formation of AGEs in vitro. Of these, 22 extracts were found to have a significant AGEs inhibitory activity ($IC_{50}$<50 ${\mu}g$/ml) compared with aminoguanidine ($IC_{50}$=75.98 ${\mu}g$/ml). Particularly, 6 extracts from 3 herbal medicines, Castanea crenata (flower, leaf, bark-twig), Acer tatarium subsp. ginnala (fruit) and Sapium japonicum (leaf, twig) showed (approximately 8-17 fold) stronger inhibitory activity than that of aminoguanidine.

• Applied Biological Chemistry
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• 제51권4호
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• pp.316-320
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• 2008

과육을 제거한 산수유 씨의 MeOH 추출물의 EtOAc 분획물로부터 이용하여 10종의 화합물을 분리하였다. 이들 중에서 (+)- pinoresinol, (-)-balanophonin, vanillin, 4-hydroxybenzaldehyde, coniferaldehyde, betulinic acid는 이 식물에서 처음으로 분리된 물질들이다. 본 연구에서 분리된 10종의 화합물에 대한 in vitro 최종당화산물(AGEs) 생성억제효능 실험결과, (-)-balanophonin (화합물 2)과 gallicin(화합물 3)이 각각 $IC_{50}$ 값 27.81과 18.04${\mu}M$로 비교양성대조군인 aminoguanidine(974.59 ${\mu}M$)보다 훨씬 우수한 효능을 나타내었다.

• 동의생리병리학회지
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• 제26권3호
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• pp.273-280
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• 2012

Scutellaria baicalensis Georgi, which has been known to be able to clear away heat and remove dampness, was used for febrile disease. It is now clear that Advanced glycation end products (AGEs) play major roles in the pathogenesis of diabetic complications such as atherosclerosis. In this study, we examined whether Scutellaria baicalensis Georgi suppress the AGE mediated inflammatory responses in the THP-1 cells. AGE treatment increased the gene expression of pro-inflammatory cytokines such as tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$), interleukin-$1{\beta}$ (IL-$1{\beta}$), monocyte chemotactic protein-1 (MCP-1) and cyclooxygenase-2 (COX-2). Reverse transcriptase-polymerase chain reaction and Western blot analysis revealed that S. baicalensis had inhibitory effects on the expression of pro-inflammatory genes and protein levels in AGE-treated THP-1 cells. S. baicalensis had also reduced the production of ROS in the AGE-treated THP-1 cells. These results suggest that S. baicalensis has inhibitory effects for the development of diabetic vascular complication.

• 생약학회지
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• 제43권4호
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• pp.338-344
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• 2012

Advanced glycation end products (AGEs) have been postulated to play a central role in the development of diabetic complications. A variety of different agents that inhibit AGEs have been under investigation. In this study, 62 herbal medicines from China and Vietnam have been investigated with an in vitro evaluation system using AGEs formation inhibitory activity. Of these, 5 herbal medicines ($IC_{50}$ < $5{\mu}g/ml$) were found to have significant AGEs formation inhibitory activity. Particularly, herbal medicines Albizia odoratissima (twigs and leaves), Rhododendron spinuliferum (twigs and leaves), Dioscorea cirrhosa (stems and leaves), Illicium verum (stems and leaves) and Aglaia perviridis (stems and leaves), showed more potent inhibitory activity (approximately 16-26 fold) than the positive control aminoguanidine ($IC_{50}=76.47{\mu}g/ml$).

• 한국한의학연구원논문집
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• 제9권1호
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• pp.123-126
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• 2003

Advanced glycation end products(AGEs) are largly involved in the pathogenesis of diabetic complications. It is obvious that inhibition of AGEs formation is important in preventing the occurrence and progression of diabetic complications. Therefore, to seek possible AGEs inhibitors in herbal medicines, unprocessed - und processed Puerariae Radix were tested. The inhibitory effect on AGEs formation was slightly increased through processing. Unprocessed-, processed Puerariae Radix and puerarin showed potential inhibitory action than that of positive control, amino guanidine HCI.

• 한국해양바이오학회지
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• 제13권2호
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• pp.94-103
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• 2021

Here, we evaluated the anti-glycation effects and renal protective properties of 70% (v/v) ethanolic extract of Colpomenia sinuosa (CSE) against AGEs -induced oxidative stress and apoptosis at different concentrations (1, 5, and 20 ㎍/mL). At 20 ㎍/mL, CSE showed that anti-glycation activities via the inhibition of AGE formation (51.1%), inhibition of AGEs-protein cross-linking (61.7%), and breaking of AGEs-protein cross-links (33.3%), were significantly (###p < 0.001 vs. non-treated group) lower than the nontreated group. Methylglyoxal (MGO) significantly (***p < 0.001) reduced cell viability (24.4%) and increased reactive oxygen species (ROS) level (642.3%), MGO accumulation (119.4 ㎍/mL), and apoptosis (55.0%) in mesangial cells compared to the nontreated group. Pretreatment with CSE significantly (###p < 0.001) increased cell viability (57.8%) and decreased intracellular ROS (96.5%), MGO accumulation (80.0 ㎍/mL), and apoptosis (22.6%) at 20 ㎍/mL. Additionally, we confirmed intracellular AGEs reduction by CSE pretreatment. Consequently, our results suggest that CSE is a good source of natural therapeutics for managing diabetic complications by the antiglycation effect and renal protective activity against MGO-induced oxidative stress.

• 대한화장품학회지
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• 제47권2호
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• pp.147-153
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• 2021

콜라겐 가수 분해물(collagen hydrolysate, CH)은 피부 진피 섬유아세포를 자극하여 콜라겐과 엘라스틴 같은 세포 외 기질 합성을 촉진함으로써 피부 노화 방지에 도움을 주는 것으로 알려져 있다. 최근 피부 노화를 일으키는 다양한 요인 중 최종당화산물(advanced glycation end products, AGEs)이 주목을 받고 있음에도 불구하고, 아직까지 CH가 AGE축적에 미치는 영향은 연구된 바 없다. CH는 피부 구조단백질의 생성을 촉진하여 AGE 축적에 영향을 줄 수 있으므로, 이를 확인하기 위해 트리펩타이드25%, Gly-Pro-Hyp 4%를 함유한 CH인 저분자콜라겐펩타이드(low molecule weight collagen peptide, LMCP)를 이용하여 임상시험을 수행하였다. 피부 조직 내 AGE 축적량을 평가하기 위해 AGE reader를 사용하여 피부자가형광(skin autofluorescence, SAF) 값을 측정하였다. 0.5%와 1.0% LMCP 용액을 8 주 동안 피험자의 전박에 도포한 결과, 시험부위의 SAF값이 대조부위에 비해 유의하게 감소하였다. 추가적으로, LMCP에 의한 피부섬유아세포의 콜라겐 합성 촉진을 평가하기 위해 CCD-986sk를 이용하여 in vitro test를 수행하였다. 그 결과, 800 ㎍/mL의 LMCP는 CCD-986sk의 human pro-collagen Iα1(COL1A1) 합성을 증가시켰다. 본 연구를 통해 LMCP도포가 콜라겐 합성을 촉진하여 항당화 효과에 도움을 줄 수 있다는 것을 확인하였으며, 이는 LMCP가 노화 방지 화장품 원료로써 잠재력이 있음을 시사한다.

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2010년도 심포지엄 및 추계학술발표회
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• pp.517-518
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• 2010