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You-jin Jeon - One of the best experts on this subject based on the ideXlab platform.
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diphlorethohydroxycarmalol isolated from Ishige okamurae exerts vasodilatory effects via calcium signaling and pi3k akt enos pathway
International Journal of Molecular Sciences, 2021Co-Authors: Yunfei Jiang, Hye-won Yang, You-jin Jeon, Jin Hwang, Bomi RyuAbstract:Nitric oxide (NO) is released by endothelial cells in the blood vessel wall to enhance vasodilation. Marine polyphenols are known to have protective effects against vascular dysfunction and hypertension. The present study is the first to investigate how diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae affects calcium levels, resulting in enhanced vasodilation. We examined calcium modulation with the well-known receptors, acetylcholine receptor (AchR) and vascular endothelial growth factor 2 (VEGFR2), which are related to NO formation, and further confirmed the vasodilatory effect of DPHC. We confirmed that DPHC stimulated NO production by increasing calcium levels and endothelial nitric oxide synthase (eNOS) expression. DPHC affected AchR and VEGFR2 expression, thereby influencing transient calcium intake. Specific antagonists, atropine and SU5416, were used to verify our findings. Furthermore, based on the results of in vivo experiments, we treated Tg(flk:EGFP) transgenic zebrafish with DPHC to confirm its vasodilatory effect. In conclusion, the present study showed that DPHC modulated calcium transit through AchR and VEGFR2, increasing endothelial-dependent NO production. Thus, DPHC, a natural marine component, can efficiently ameliorate cardiovascular diseases by improving vascular function.
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Diphlorethohydroxycarmalol Isolated from Ishige okamurae Exerts Vasodilatory Effects via Calcium Signaling and PI3K/Akt/eNOS Pathway.
International journal of molecular sciences, 2021Co-Authors: Yunfei Jiang, Hye-won Yang, You-jin Jeon, Jin Hwang, Bomi RyuAbstract:Nitric oxide (NO) is released by endothelial cells in the blood vessel wall to enhance vasodilation. Marine polyphenols are known to have protective effects against vascular dysfunction and hypertension. The present study is the first to investigate how diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae affects calcium levels, resulting in enhanced vasodilation. We examined calcium modulation with the well-known receptors, acetylcholine receptor (AchR) and vascular endothelial growth factor 2 (VEGFR2), which are related to NO formation, and further confirmed the vasodilatory effect of DPHC. We confirmed that DPHC stimulated NO production by increasing calcium levels and endothelial nitric oxide synthase (eNOS) expression. DPHC affected AchR and VEGFR2 expression, thereby influencing transient calcium intake. Specific antagonists, atropine and SU5416, were used to verify our findings. Furthermore, based on the results of in vivo experiments, we treated Tg(flk:EGFP) transgenic zebrafish with DPHC to confirm its vasodilatory effect. In conclusion, the present study showed that DPHC modulated calcium transit through AchR and VEGFR2, increasing endothelial-dependent NO production. Thus, DPHC, a natural marine component, can efficiently ameliorate cardiovascular diseases by improving vascular function.
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Ishophloroglucin A Isolated from Ishige okamurae Suppresses Melanogenesis Induced by α-MSH: In Vitro and In Vivo.
Marine drugs, 2020Co-Authors: Hye-won Yang, You-jin Jeon, Yunfei Jiang, Bomi RyuAbstract:Diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae (IO) showed potential whitening effects against UV-B radiation. However, the components of IO as well as their molecular mechanism against α-melanocyte-stimulating hormone (α-MSH) have not yet been investigated. Thus, this study aimed to investigate the inhibitory effects of Ishophloroglucin A (IPA), a phlorotannin isolated from brown algae IO, and its crude extract (IOE), in melanogenesis in vivo in an α-MSH-induced zebrafish model and in B16F10 melanoma cells in vitro. Molecular docking studies of the phlorotannins were carried out to determine their inhibitory effects and to elucidate their mode of interaction with tyrosinase, a glycoprotein related to melanogenesis. In addition, morphological changes and melanin content decreased in the α-MSH-induced zebrafish model after IPA and IOE treatment. Furthermore, Western blotting results revealed that IPA upregulated the extracellular related protein expression in α-MSH-stimulated B16F10 cells. Hence, these results suggest that IPA isolated from IOE has a potential for use in the pharmaceutical and cosmetic industries.
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Ishige okamurae reduces blood glucose levels in high-fat diet mice and improves glucose metabolism in the skeletal muscle and pancreas
Fisheries and Aquatic Sciences, 2020Co-Authors: Hye-won Yang, You-jin Jeon, Myeongjoo Son, Junwon Choi, Kyunghee Byun, Bomi RyuAbstract:Brown alga (Ishige okamurae; IO) dietary supplements have been reported to possess anti-diabetic properties. However, the effects of IO supplements have not been evaluated on glucose metabolism in the pancreas and skeletal muscle. C57BL/6 N male mice (age, 7 weeks) were arranged in five groups: a chow diet with 0.9% saline (NFD/saline group), high-fat diet (HFD) with 0.9% saline (HFD/saline group). high-fat diet with 25 mg/kg IO extract (HFD/25/IOE). high-fat diet with 50 mg/kg IO extract (HFD/50/IOE), and high-fat diet with 75 mg/kg IO extract (HFD/75/IOE). After 4 weeks, the plasma, pancreas, and skeletal muscle samples were collected for biochemical analyses. IOE significantly ameliorated glucose tolerance impairment and fasting and 2 h blood glucose level in HFD mice. IOE also stimulated the protein expressions of the glucose transporters (GLUTs) including GLUT2 and GLUT4 and those of their related transcription factors in the pancreases and skeletal muscles of HFD mice, enhanced glucose metabolism, and regulated blood glucose level. Our results suggest Ishige okamurae extract may reduce blood glucose levels by improving glucose metabolism in the pancreas and skeletal muscle in HFD-induced diabetes.
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High-performance centrifugal partition chromatography (HPCPC) for efficient isolation of diphlorethohydroxycarmalol (DPHC) and screening of its antioxidant activity in a zebrafish model
Process Biochemistry, 2020Co-Authors: Hyun-soo Kim, Eun-a Kim, Soo-jin Heo, Lei Wang, Thilina U. Jayawardena, I. P. Shanura Fernando, Ji-hyeok Lee, You-jin JeonAbstract:Abstract High-performance centrifugal partition chromatography (HPCPC) can be used for the rapid isolation of biologically active metabolites from natural sources. The present study investigates the one-step isolation of diphlorethohydroxycarmalol (DPHC), an algal polyphenol, from the brown seaweed Ishige okamurae by HPCPC and its protective effect against 2,2’-azobis dihydrochloride (AAPH) induced oxidative stress in zebrafish embryos. HPCPC was found to be efficient and effective for the isolation of DPHC from Ishige okamurae under optimized solvent conditions, yielding a high purity product. The present purification method helps overcome compound wasting and possible degradation, which cause a low yield in conventional column separations. Further, zebrafish embryos exposed to AAPH were compared with and without DPHC treatment, two days after fertilization for ROS generation, cell death, lipid peroxidation, survival rate, and heartbeat rates. These evaluations revealed that DPHC treatment significantly enhanced protection against oxidative stress in zebrafish embryos. HPCPC was, therefore, established as an efficient DPHC isolation method and could be used for separating other complex phlorotannins from seaweeds.
Soo-jin Heo - One of the best experts on this subject based on the ideXlab platform.
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High-performance centrifugal partition chromatography (HPCPC) for efficient isolation of diphlorethohydroxycarmalol (DPHC) and screening of its antioxidant activity in a zebrafish model
Process Biochemistry, 2020Co-Authors: Hyun-soo Kim, Eun-a Kim, Soo-jin Heo, Lei Wang, Thilina U. Jayawardena, I. P. Shanura Fernando, Ji-hyeok Lee, You-jin JeonAbstract:Abstract High-performance centrifugal partition chromatography (HPCPC) can be used for the rapid isolation of biologically active metabolites from natural sources. The present study investigates the one-step isolation of diphlorethohydroxycarmalol (DPHC), an algal polyphenol, from the brown seaweed Ishige okamurae by HPCPC and its protective effect against 2,2’-azobis dihydrochloride (AAPH) induced oxidative stress in zebrafish embryos. HPCPC was found to be efficient and effective for the isolation of DPHC from Ishige okamurae under optimized solvent conditions, yielding a high purity product. The present purification method helps overcome compound wasting and possible degradation, which cause a low yield in conventional column separations. Further, zebrafish embryos exposed to AAPH were compared with and without DPHC treatment, two days after fertilization for ROS generation, cell death, lipid peroxidation, survival rate, and heartbeat rates. These evaluations revealed that DPHC treatment significantly enhanced protection against oxidative stress in zebrafish embryos. HPCPC was, therefore, established as an efficient DPHC isolation method and could be used for separating other complex phlorotannins from seaweeds.
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Diphlorethohydroxycarmalol Attenuates Methylglyoxal-Induced Oxidative Stress and Advanced Glycation End Product Formation in Human Kidney Cells
Hindawi Limited, 2018Co-Authors: Seon-heui Cha, Soo-jin Heo, Yongha Hwang, Hee-sook JunAbstract:Diabetic nephropathy is the leading cause of end-stage renal disease in patients with diabetes mellitus. Oxidative stress has been shown to play an important role in pathogeneses of renal damage in diabetic patients. Here, we investigated the protective effect of diphlorethohydroxycarmalol (DPHC), which is a polyphenol isolated from an edible seaweed, Ishige okamurae, on methylglyoxal-induced oxidative stress in HEK cells, a human embryonic kidney cell line. DPHC treatment inhibited methylglyoxal- (MGO-) induced cytotoxicity and ROS production. DPHC activated the Nrf2 transcription factor and increased the mRNA expression of antioxidant and detoxification enzymes, consequently reducing MGO-induced advanced glycation end product formation. In addition, DPHC increased glyoxalase-1 mRNA expression and attenuated MGO-induced advanced glycation end product formation in HEK cells. These results suggest that DPHC possesses a protective activity against MGO-induced cytotoxicity in human kidney cells by preventing oxidative stress and advanced glycation end product formation. Therefore, it could be used as a potential therapeutic agent for the prevention of diabetic nephropathy
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Anti-inflammatory effect of supercritical extract and its constituents from Ishige okamurae.
EXCLI journal, 2016Co-Authors: Weon-jong Yoon, Soo-jin Heo, I. P. Shanura Fernando, Hae-won Lee, Kichul Cho, Chi-heon Lee, Sung-pyo Hur, Su-hyeon ChoAbstract:The anti-inflammatory properties of the supercritical fluid extract of Ishige okamurae (SFEIO) on lipopolysaccharide (LPS)-stimulated murine RAW 264.7 macrophages. The lipid profile of the SFEIO, reviled the presence of palmitic acid (220.2 mg/g), linoleic acid (168.0 mg/g), and oleic acid (123.0 mg/g). SFEIO was found to exert it's anti-inflammatory effects through inhibiting nitric oxide (NO), prostaglandin E2 (PGE2), inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and IL-6 production in LPS-stimulated RAW 264.7 cells, without inducing cytotoxicity. SFEIO did not effect on the LPS-induced p38 kinase phosphorylation, whereas it attenuated the extracellular-related signaling kinase (ERK) and c-Jun N-terminal kinase (JNK) phosphorylation. Furthermore, SFEIO inhibited the LPS-induced IκB-α degradation and p50 NF-κB activation. These results suggest that SFEIO exerts its anti-inflammatory effects in LPS-activated RAW 264.7 cells by down-regulating the activation of ERK, JNK, and NF-κB.
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Angiotensin I-converting enzyme (ACE) inhibition and nitric oxide (NO)-mediated antihypertensive effect of octaphlorethol A isolated from Ishige sinicola: In vitro molecular mechanism and in vivo SHR model
Journal of Functional Foods, 2015Co-Authors: Won-kyo Jung, Seung-hong Lee, Soo-jin Heo, Min-cheol Kang, Sung-myung Kang, Kyong-hwa Kang, Yong-tae Kim, Sun Joo Park, Yoonhwa JeongAbstract:Angiotensin I-converting enzyme (ACE) inhibition and nitric oxide (NO) production are important factors that regulate blood pressure. In this study, the effects of octaphlorethol A (OPA) isolated from Ishige sinicola on ACE inhibition and NO production, the molecular mechanism underlying ACE inhibition, as well as its antihypertensive effect in spontaneously hypertensive rats (SHRs) were investigated. IC50 value of OPA against ACE was 59 µM. Molecular modelling studies indicated that the compound interacts with Cys370, Glu162, Glu376, Glu403, Glu411, Asp377, His383, His387, Tyr520, Arg522, Tyr523, and Lys511. In human endothelial cells, OPA increased endothelial nitric oxide synthase (eNOS) phosphorylation. We also demonstrated that these OPA-induced effects essentially depended on protein kinase B (Akt) and AMP-activated protein kinase (AMPK) activation. Furthermore, systolic blood pressure was reduced (21.9 mmHg in 6 h) by administration of the compound in SHRs. The results of this study suggested that OPA could be developed as a therapeutic agent for hypertension.
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Antidiabetogenic and Antioxidative Effects of Octaphlorethol A Isolated from the Brown Algae Ishige foliacea in Streptozotocin- induced Diabetic Mice
Food Science and Biotechnology, 2014Co-Authors: Seung-hong Lee, Nalae Kang, Eun-a Kim, Soo-jin Heo, Sang-ho Moon, Byong-tae Jeon, You-jin JeonAbstract:The antidiabetogenic and antioxidative effects of octaphlorethol A (OPA) isolated from the brown algae Ishige foliacea in streptozotocin (STZ)-induced diabetic mice were analyzed. STZ-induced diabetic mice showed a significant (p
Bomi Ryu - One of the best experts on this subject based on the ideXlab platform.
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Diphlorethohydroxycarmalol Isolated from Ishige okamurae Exerts Vasodilatory Effects via Calcium Signaling and PI3K/Akt/eNOS Pathway.
International journal of molecular sciences, 2021Co-Authors: Yunfei Jiang, Hye-won Yang, You-jin Jeon, Jin Hwang, Bomi RyuAbstract:Nitric oxide (NO) is released by endothelial cells in the blood vessel wall to enhance vasodilation. Marine polyphenols are known to have protective effects against vascular dysfunction and hypertension. The present study is the first to investigate how diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae affects calcium levels, resulting in enhanced vasodilation. We examined calcium modulation with the well-known receptors, acetylcholine receptor (AchR) and vascular endothelial growth factor 2 (VEGFR2), which are related to NO formation, and further confirmed the vasodilatory effect of DPHC. We confirmed that DPHC stimulated NO production by increasing calcium levels and endothelial nitric oxide synthase (eNOS) expression. DPHC affected AchR and VEGFR2 expression, thereby influencing transient calcium intake. Specific antagonists, atropine and SU5416, were used to verify our findings. Furthermore, based on the results of in vivo experiments, we treated Tg(flk:EGFP) transgenic zebrafish with DPHC to confirm its vasodilatory effect. In conclusion, the present study showed that DPHC modulated calcium transit through AchR and VEGFR2, increasing endothelial-dependent NO production. Thus, DPHC, a natural marine component, can efficiently ameliorate cardiovascular diseases by improving vascular function.
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diphlorethohydroxycarmalol isolated from Ishige okamurae exerts vasodilatory effects via calcium signaling and pi3k akt enos pathway
International Journal of Molecular Sciences, 2021Co-Authors: Yunfei Jiang, Hye-won Yang, You-jin Jeon, Jin Hwang, Bomi RyuAbstract:Nitric oxide (NO) is released by endothelial cells in the blood vessel wall to enhance vasodilation. Marine polyphenols are known to have protective effects against vascular dysfunction and hypertension. The present study is the first to investigate how diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae affects calcium levels, resulting in enhanced vasodilation. We examined calcium modulation with the well-known receptors, acetylcholine receptor (AchR) and vascular endothelial growth factor 2 (VEGFR2), which are related to NO formation, and further confirmed the vasodilatory effect of DPHC. We confirmed that DPHC stimulated NO production by increasing calcium levels and endothelial nitric oxide synthase (eNOS) expression. DPHC affected AchR and VEGFR2 expression, thereby influencing transient calcium intake. Specific antagonists, atropine and SU5416, were used to verify our findings. Furthermore, based on the results of in vivo experiments, we treated Tg(flk:EGFP) transgenic zebrafish with DPHC to confirm its vasodilatory effect. In conclusion, the present study showed that DPHC modulated calcium transit through AchR and VEGFR2, increasing endothelial-dependent NO production. Thus, DPHC, a natural marine component, can efficiently ameliorate cardiovascular diseases by improving vascular function.
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Ishophloroglucin A Isolated from Ishige okamurae Suppresses Melanogenesis Induced by α-MSH: In Vitro and In Vivo.
Marine drugs, 2020Co-Authors: Hye-won Yang, You-jin Jeon, Yunfei Jiang, Bomi RyuAbstract:Diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae (IO) showed potential whitening effects against UV-B radiation. However, the components of IO as well as their molecular mechanism against α-melanocyte-stimulating hormone (α-MSH) have not yet been investigated. Thus, this study aimed to investigate the inhibitory effects of Ishophloroglucin A (IPA), a phlorotannin isolated from brown algae IO, and its crude extract (IOE), in melanogenesis in vivo in an α-MSH-induced zebrafish model and in B16F10 melanoma cells in vitro. Molecular docking studies of the phlorotannins were carried out to determine their inhibitory effects and to elucidate their mode of interaction with tyrosinase, a glycoprotein related to melanogenesis. In addition, morphological changes and melanin content decreased in the α-MSH-induced zebrafish model after IPA and IOE treatment. Furthermore, Western blotting results revealed that IPA upregulated the extracellular related protein expression in α-MSH-stimulated B16F10 cells. Hence, these results suggest that IPA isolated from IOE has a potential for use in the pharmaceutical and cosmetic industries.
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Ishige okamurae reduces blood glucose levels in high-fat diet mice and improves glucose metabolism in the skeletal muscle and pancreas
Fisheries and Aquatic Sciences, 2020Co-Authors: Hye-won Yang, You-jin Jeon, Myeongjoo Son, Junwon Choi, Kyunghee Byun, Bomi RyuAbstract:Brown alga (Ishige okamurae; IO) dietary supplements have been reported to possess anti-diabetic properties. However, the effects of IO supplements have not been evaluated on glucose metabolism in the pancreas and skeletal muscle. C57BL/6 N male mice (age, 7 weeks) were arranged in five groups: a chow diet with 0.9% saline (NFD/saline group), high-fat diet (HFD) with 0.9% saline (HFD/saline group). high-fat diet with 25 mg/kg IO extract (HFD/25/IOE). high-fat diet with 50 mg/kg IO extract (HFD/50/IOE), and high-fat diet with 75 mg/kg IO extract (HFD/75/IOE). After 4 weeks, the plasma, pancreas, and skeletal muscle samples were collected for biochemical analyses. IOE significantly ameliorated glucose tolerance impairment and fasting and 2 h blood glucose level in HFD mice. IOE also stimulated the protein expressions of the glucose transporters (GLUTs) including GLUT2 and GLUT4 and those of their related transcription factors in the pancreases and skeletal muscles of HFD mice, enhanced glucose metabolism, and regulated blood glucose level. Our results suggest Ishige okamurae extract may reduce blood glucose levels by improving glucose metabolism in the pancreas and skeletal muscle in HFD-induced diabetes.
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Effect of Ishophloroglucin A, A Component of Ishige okamurae, on Glucose Homeostasis in the Pancreas and Muscle of High Fat Diet-Fed Mice.
Marine drugs, 2019Co-Authors: Hye-won Yang, You-jin Jeon, Myeongjoo Son, Junwon Choi, Kyunghee Byun, Bomi RyuAbstract:Ishophloroglucin A (IPA), a component of Ishige okamurae (IO), was previously evaluated to standardize the antidiabetic potency of IO. However, the potential of IPA as a functional food for diabetes prevention has not yet been evaluated. Here, we investigated if 1.35 mg/kg IPA, which is the equivalent content of IPA in 75 mg/kg IO, improved glucose homeostasis in high-fat diet (HFD)-induced diabetes after 12 weeks of treatment. IPA significantly ameliorated glucose intolerance, reducing fasting glucose levels as well as 2 h glucose levels in HFD mice. In addition, IPA exerted a protective effect on the pancreatic function in HFD mice via pancreatic β-cells and C-peptide. The level of glucose transporter 4 (GLUT4) in the muscles of HFD mice was stimulated by IPA intake. Our results suggested that IPA, which is a component of IO, can improve glucose homeostasis via GLUT4 in the muscles of HFD mice. IO may be used as a functional food for the prevention of diabetes.
Seung-hong Lee - One of the best experts on this subject based on the ideXlab platform.
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Inhibition of Adipogenesis by Diphlorethohydroxycarmalol (DPHC) through AMPK Activation in Adipocytes
MDPI AG, 2019Co-Authors: Min-cheol Kang, You-jin Jeon, Hyun-soo Kim, Yuling Ding, Seung-hong LeeAbstract:The purpose of this study was to investigate the antiobesity effect and the mechanism of action of diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae in 3T3-L1 cells. The antiobesity effects were examined by evaluating intracellular fat accumulation in Oil Red O-stained adipocytes. Based on the results, DPHC dose-dependently inhibited the lipid accumulation in 3T3-L1 adipocytes. DPHC significantly inhibited adipocyte-specific proteins such as SREBP-1c, PPARγ, C/EBP α, and adiponectin, as well as adipogenic enzymes, including perilipin, FAS, FABP4, and leptin in adipocytes. These results indicated that DPHC primarily acts by regulating adipogenic-specific proteins through inhibiting fat accumulation and fatty acid synthesis in adipocytes. DPHC treatment significantly increased both AMPK and ACC phosphorylation in adipocytes. These results indicate that DPHC inhibits the fat accumulation by activating AMPK and ACC in 3T3-L1 cells. Taken together, these results suggest that DPHC can be used as a potential therapeutic agent against obesity
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Angiotensin I-converting enzyme (ACE) inhibition and nitric oxide (NO)-mediated antihypertensive effect of octaphlorethol A isolated from Ishige sinicola: In vitro molecular mechanism and in vivo SHR model
Journal of Functional Foods, 2015Co-Authors: Won-kyo Jung, Seung-hong Lee, Soo-jin Heo, Min-cheol Kang, Sung-myung Kang, Kyong-hwa Kang, Yong-tae Kim, Sun Joo Park, Yoonhwa JeongAbstract:Angiotensin I-converting enzyme (ACE) inhibition and nitric oxide (NO) production are important factors that regulate blood pressure. In this study, the effects of octaphlorethol A (OPA) isolated from Ishige sinicola on ACE inhibition and NO production, the molecular mechanism underlying ACE inhibition, as well as its antihypertensive effect in spontaneously hypertensive rats (SHRs) were investigated. IC50 value of OPA against ACE was 59 µM. Molecular modelling studies indicated that the compound interacts with Cys370, Glu162, Glu376, Glu403, Glu411, Asp377, His383, His387, Tyr520, Arg522, Tyr523, and Lys511. In human endothelial cells, OPA increased endothelial nitric oxide synthase (eNOS) phosphorylation. We also demonstrated that these OPA-induced effects essentially depended on protein kinase B (Akt) and AMP-activated protein kinase (AMPK) activation. Furthermore, systolic blood pressure was reduced (21.9 mmHg in 6 h) by administration of the compound in SHRs. The results of this study suggested that OPA could be developed as a therapeutic agent for hypertension.
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Antidiabetogenic and Antioxidative Effects of Octaphlorethol A Isolated from the Brown Algae Ishige foliacea in Streptozotocin- induced Diabetic Mice
Food Science and Biotechnology, 2014Co-Authors: Seung-hong Lee, Nalae Kang, Eun-a Kim, Soo-jin Heo, Sang-ho Moon, Byong-tae Jeon, You-jin JeonAbstract:The antidiabetogenic and antioxidative effects of octaphlorethol A (OPA) isolated from the brown algae Ishige foliacea in streptozotocin (STZ)-induced diabetic mice were analyzed. STZ-induced diabetic mice showed a significant (p
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antidiabetogenic and antioxidative effects of octaphlorethol a isolated from the brown algae Ishige foliacea in streptozotocin induced diabetic mice
Food Science and Biotechnology, 2014Co-Authors: Seung-hong Lee, Nalae Kang, Eun-a Kim, Soo-jin Heo, Sang-ho Moon, Byong-tae Jeon, You-jin JeonAbstract:The antidiabetogenic and antioxidative effects of octaphlorethol A (OPA) isolated from the brown algae Ishige foliacea in streptozotocin (STZ)-induced diabetic mice were analyzed. STZ-induced diabetic mice showed a significant (p<0.05) increase in blood glucose and lipid peroxidation levels and a significant (p<0.05) decrease in the plasma insulin level and body weight, compared with controls. Diabetic mice also showed a significant (p<0.05) decrease in the activities of the antioxidant enzymes catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GSH-px), compared with controls. Oral treatment with OPA (5 and 10 mg/kg) showed protective effects against all the biochemical parameters studied. OPA-treated mice exhibited suppression of apoptosis, and treatment with OPA was associated with an increase in antiapoptotic BclxL expression and a reduction in pro-apoptotic Bax and cleaved caspase-3 expressions. OPA has antidiabetogenic and antioxidative effects, and potential for use in therapies as both a natural functional food and a pharmaceutical agent.
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Protective effect of fucoxanthin isolated from Ishige okamurae against high-glucose induced oxidative stress in human umbilical vein endothelial cells and zebrafish model
Journal of Functional Foods, 2014Co-Authors: Min-cheol Kang, Seung-hong Lee, Nalae Kang, Eun-a Kim, Wonwoo Lee, Daekyung Kim, Seo-young Kim, Dae Ho Lee, You-jin JeonAbstract:Abstract High glucose induced oxidative stress is implicated in intracellular toxicity in tissue and blood vessel such as oxidative stress, lipid peroxidation, and cell death. In this study, we attempted to investigate protective effects of fucoxanthin isolated from Ishige okamurae against high glucose induced oxidative stress in human umbilical vein endothelial cells (HUVEC) and zebrafish model. The ROS generation, lipid peroxidation and cell death were significantly reduced in both the fucoxanthin treated HUVEC and zebrafish in vivo model, compared to those of both negative controls. This study indicates that fucoxanthin could protect cells and organ injury against oxidative stress induced by high glucose in vitro HUVEC and in vivo zebrafish model.
Hye-won Yang - One of the best experts on this subject based on the ideXlab platform.
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Diphlorethohydroxycarmalol Isolated from Ishige okamurae Exerts Vasodilatory Effects via Calcium Signaling and PI3K/Akt/eNOS Pathway.
International journal of molecular sciences, 2021Co-Authors: Yunfei Jiang, Hye-won Yang, You-jin Jeon, Jin Hwang, Bomi RyuAbstract:Nitric oxide (NO) is released by endothelial cells in the blood vessel wall to enhance vasodilation. Marine polyphenols are known to have protective effects against vascular dysfunction and hypertension. The present study is the first to investigate how diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae affects calcium levels, resulting in enhanced vasodilation. We examined calcium modulation with the well-known receptors, acetylcholine receptor (AchR) and vascular endothelial growth factor 2 (VEGFR2), which are related to NO formation, and further confirmed the vasodilatory effect of DPHC. We confirmed that DPHC stimulated NO production by increasing calcium levels and endothelial nitric oxide synthase (eNOS) expression. DPHC affected AchR and VEGFR2 expression, thereby influencing transient calcium intake. Specific antagonists, atropine and SU5416, were used to verify our findings. Furthermore, based on the results of in vivo experiments, we treated Tg(flk:EGFP) transgenic zebrafish with DPHC to confirm its vasodilatory effect. In conclusion, the present study showed that DPHC modulated calcium transit through AchR and VEGFR2, increasing endothelial-dependent NO production. Thus, DPHC, a natural marine component, can efficiently ameliorate cardiovascular diseases by improving vascular function.
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diphlorethohydroxycarmalol isolated from Ishige okamurae exerts vasodilatory effects via calcium signaling and pi3k akt enos pathway
International Journal of Molecular Sciences, 2021Co-Authors: Yunfei Jiang, Hye-won Yang, You-jin Jeon, Jin Hwang, Bomi RyuAbstract:Nitric oxide (NO) is released by endothelial cells in the blood vessel wall to enhance vasodilation. Marine polyphenols are known to have protective effects against vascular dysfunction and hypertension. The present study is the first to investigate how diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae affects calcium levels, resulting in enhanced vasodilation. We examined calcium modulation with the well-known receptors, acetylcholine receptor (AchR) and vascular endothelial growth factor 2 (VEGFR2), which are related to NO formation, and further confirmed the vasodilatory effect of DPHC. We confirmed that DPHC stimulated NO production by increasing calcium levels and endothelial nitric oxide synthase (eNOS) expression. DPHC affected AchR and VEGFR2 expression, thereby influencing transient calcium intake. Specific antagonists, atropine and SU5416, were used to verify our findings. Furthermore, based on the results of in vivo experiments, we treated Tg(flk:EGFP) transgenic zebrafish with DPHC to confirm its vasodilatory effect. In conclusion, the present study showed that DPHC modulated calcium transit through AchR and VEGFR2, increasing endothelial-dependent NO production. Thus, DPHC, a natural marine component, can efficiently ameliorate cardiovascular diseases by improving vascular function.
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Ishophloroglucin A Isolated from Ishige okamurae Suppresses Melanogenesis Induced by α-MSH: In Vitro and In Vivo.
Marine drugs, 2020Co-Authors: Hye-won Yang, You-jin Jeon, Yunfei Jiang, Bomi RyuAbstract:Diphlorethohydroxycarmalol (DPHC) isolated from Ishige okamurae (IO) showed potential whitening effects against UV-B radiation. However, the components of IO as well as their molecular mechanism against α-melanocyte-stimulating hormone (α-MSH) have not yet been investigated. Thus, this study aimed to investigate the inhibitory effects of Ishophloroglucin A (IPA), a phlorotannin isolated from brown algae IO, and its crude extract (IOE), in melanogenesis in vivo in an α-MSH-induced zebrafish model and in B16F10 melanoma cells in vitro. Molecular docking studies of the phlorotannins were carried out to determine their inhibitory effects and to elucidate their mode of interaction with tyrosinase, a glycoprotein related to melanogenesis. In addition, morphological changes and melanin content decreased in the α-MSH-induced zebrafish model after IPA and IOE treatment. Furthermore, Western blotting results revealed that IPA upregulated the extracellular related protein expression in α-MSH-stimulated B16F10 cells. Hence, these results suggest that IPA isolated from IOE has a potential for use in the pharmaceutical and cosmetic industries.
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Ishige okamurae reduces blood glucose levels in high-fat diet mice and improves glucose metabolism in the skeletal muscle and pancreas
Fisheries and Aquatic Sciences, 2020Co-Authors: Hye-won Yang, You-jin Jeon, Myeongjoo Son, Junwon Choi, Kyunghee Byun, Bomi RyuAbstract:Brown alga (Ishige okamurae; IO) dietary supplements have been reported to possess anti-diabetic properties. However, the effects of IO supplements have not been evaluated on glucose metabolism in the pancreas and skeletal muscle. C57BL/6 N male mice (age, 7 weeks) were arranged in five groups: a chow diet with 0.9% saline (NFD/saline group), high-fat diet (HFD) with 0.9% saline (HFD/saline group). high-fat diet with 25 mg/kg IO extract (HFD/25/IOE). high-fat diet with 50 mg/kg IO extract (HFD/50/IOE), and high-fat diet with 75 mg/kg IO extract (HFD/75/IOE). After 4 weeks, the plasma, pancreas, and skeletal muscle samples were collected for biochemical analyses. IOE significantly ameliorated glucose tolerance impairment and fasting and 2 h blood glucose level in HFD mice. IOE also stimulated the protein expressions of the glucose transporters (GLUTs) including GLUT2 and GLUT4 and those of their related transcription factors in the pancreases and skeletal muscles of HFD mice, enhanced glucose metabolism, and regulated blood glucose level. Our results suggest Ishige okamurae extract may reduce blood glucose levels by improving glucose metabolism in the pancreas and skeletal muscle in HFD-induced diabetes.
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Effect of Ishophloroglucin A, A Component of Ishige okamurae, on Glucose Homeostasis in the Pancreas and Muscle of High Fat Diet-Fed Mice.
Marine drugs, 2019Co-Authors: Hye-won Yang, You-jin Jeon, Myeongjoo Son, Junwon Choi, Kyunghee Byun, Bomi RyuAbstract:Ishophloroglucin A (IPA), a component of Ishige okamurae (IO), was previously evaluated to standardize the antidiabetic potency of IO. However, the potential of IPA as a functional food for diabetes prevention has not yet been evaluated. Here, we investigated if 1.35 mg/kg IPA, which is the equivalent content of IPA in 75 mg/kg IO, improved glucose homeostasis in high-fat diet (HFD)-induced diabetes after 12 weeks of treatment. IPA significantly ameliorated glucose intolerance, reducing fasting glucose levels as well as 2 h glucose levels in HFD mice. In addition, IPA exerted a protective effect on the pancreatic function in HFD mice via pancreatic β-cells and C-peptide. The level of glucose transporter 4 (GLUT4) in the muscles of HFD mice was stimulated by IPA intake. Our results suggested that IPA, which is a component of IO, can improve glucose homeostasis via GLUT4 in the muscles of HFD mice. IO may be used as a functional food for the prevention of diabetes.
