Objective:To explore the anti-melanogenic potential of Cyrtomium falcatum.Methods:The effects of Cyrtomium falcatum crude extract and its solvent fractions on tyrosinase activity,melanin content,and the expressions of...Objective:To explore the anti-melanogenic potential of Cyrtomium falcatum.Methods:The effects of Cyrtomium falcatum crude extract and its solvent fractions on tyrosinase activity,melanin content,and the expressions of melanogenesis-related genes and proteins were analyzed inα-melanocyte-stimulating hormone(α-MSH)-stimulated B16F10 cells.Results:α-MSH treatment significantly increased tyrosinase activity,and extracellular and intracellular melanin content,as well as the expression levels of tyrosinase,microphthalmia-associated transcription factor(MITF),tyrosinase-related protein(TRP)-1,and TRP-2 in B16F10 cells.Treatment with Cyrtomium falcatum crude extract and its solvent fractions reduced tyrosinase activity and extracellular and intracellular melanin content and downregulated the expression levels of tyrosinase,MITF,TRP-1,and TRP-2 in a dose-dependent manner.Conclusions:Cyrtomium falcatum has potential anti-melanogenesis effects and can be used as a potential source material in cosmeceutical industry for the research and development of novel lead molecules with whitening properties.展开更多
Interferon(IFN) with antiviral and im-munomodulatory activities is one of the most important therapeutic agents for the treatment of chronic hepatitis. The apoptotic effect of IFN is influenced by cell type and the ty...Interferon(IFN) with antiviral and im-munomodulatory activities is one of the most important therapeutic agents for the treatment of chronic hepatitis. The apoptotic effect of IFN is influenced by cell type and the types of IFN, which suppresses proliferation and induces apoptosis in some cell types while inhibiting apoptosis in others. The aim of this study was to explore the effect of IFNα-2a on Fas expression and the apoptosis rate of peripheral blood cytotoxic T cells (CTLs) in patients with hepatitis B. METHODS:Peripheral blood mononuclear cells were isolated from 26 patients with hepatitis B including 16 patients with chronic hepatitis B and 10 patients with chronic severe hepatitis B. Fas expression and apoptosis rate of CTLs were analyzed with flow cytometry before and after IFNα-2a treatment. RESULTS:Before IFNα-2a treatment, Fas expression and apoptosis rate of CTLs from patients with chronic hepatitis B were significantly higher than those from patients with chronic severe hepatitis B and healthy controls respectively. No significant difference was observed between Fas expression and apoptosis rate of CTLs from patients with chronic severe hepatitis B and healthy controls. After IFNα-2a treatment,Fas expression and apoptosis rate of CTLs from different groups were compared with those before IFNα-2a treatment, showing no significant difference despite alternation of different degree. CONCLUSIONS:Activation induced cell death (AICD) exists in peripheral blood CTLs from patients with hepatitis B. No effect of IFNα-2a exerts on Fas expression and apoptosis rate of Fas in patients with hepatitis B.展开更多
Melanocytes that form stratum basale of skin epidermis express tyrosinase enzyme, which catalyzes initial two rate-limiting steps in the biotransformation of tyrosine into dark pigment called melanin. Even today, Tyro...Melanocytes that form stratum basale of skin epidermis express tyrosinase enzyme, which catalyzes initial two rate-limiting steps in the biotransformation of tyrosine into dark pigment called melanin. Even today, Tyrosinase inhibitors are among the promising candidates in cosmetic industry for skin-lightening formulations. Overexpression of tyrosinase causes excess melanin biosynthesis and deposition resulting in dark skin color. Moreover, localized overexpression of tyrosinase cause variety of hyperpigmentation disorders like melanoma, melasma, chloasma, dark patches, liver patches, etc. There has been a renewed interest in the natural products as main ingredients in the formulation of safe products for skin-whitening and treatment options for hyperpigmentation disorders. In the present communication, the results of our investigations on tyrosinase inhibition, modulation of intracellular tyrosinase and melanin levels in cultured B16F10 melanoma cells by Bacopa monnieri (L.) methanol extract (BME) are presented and discussed as safe option for skin lightening and to treat hyperpigmentation disorders. BME showed 11%, 29%, 54% and 80% inhibition of mushroom tyrosinase activity at an initial 100, 200, 400 and 600 μg of extract. Treatment of α-melanocyte stimulating hormone (α-MSH) stimulated cultured murine melanoma B16F10 cells with 100 μg/ml of the extract showed a decrease in the levels of cellular melanin and cellular tyrosinase content by 22% and 46% respectively. The cytotoxicity studies by MTT assay revealed that the LC50 of the BME is ≥1000 μg/ml in cultured mouse melanoma B16F10 and HEK293 cells.展开更多
Biophoton emission is produced by all living systems;this emission pattern has been shown to be altered by the presence of an electromagnetic field (EMF). Cultures of B16-BL6 cells were exposed to a weak EMF produced ...Biophoton emission is produced by all living systems;this emission pattern has been shown to be altered by the presence of an electromagnetic field (EMF). Cultures of B16-BL6 cells were exposed to a weak EMF produced by a specially constructed EM generator, called the “Resonator”, for one hour. This EM generator incorporates multiple geometric ratios in its design, including the golden ratio (phi), pi, root 2, root 3, and root 5. It has been used previously to purify water of toxins. There was a significant decrease in mean photon counts from B16-BL6 cells exposed at a distance of 1 m compared to those exposed at 0 m. Alterations in the spectral power density variability were also observed in the 8 - 10 Hz range. The EM generator may have an impact on the viability of the exposed cell cultures, but only at specific distances.展开更多
目的探讨miR-16-1对淋巴瘤细胞凋亡、侵袭及苏氨酸蛋白激酶B(ProteinkinaseB,Akt)1基因作用机制的研究。方法收集我院淋巴瘤患者肿瘤标准及正常胸腺标本,购自上海通派公司的人T淋巴瘤细胞Raji亚系,分为淋巴瘤组(未经转染)、NC组(Raji细...目的探讨miR-16-1对淋巴瘤细胞凋亡、侵袭及苏氨酸蛋白激酶B(ProteinkinaseB,Akt)1基因作用机制的研究。方法收集我院淋巴瘤患者肿瘤标准及正常胸腺标本,购自上海通派公司的人T淋巴瘤细胞Raji亚系,分为淋巴瘤组(未经转染)、NC组(Raji细胞转染miR-16-1-NC)、miR-16-1组(Raji细胞转染miR-16-1minmics)及药物对照组(Raji细胞联合1mmol/L+10μmol/L的地西他滨),分别采用qRT-PCR方法检测肿瘤及正常组织、Raji细胞的miR-16-1相对表达,分别采用MTT方法、流式细胞仪、Transwell小室方法检测Raji细胞存活率、凋亡率、侵袭数目及迁移率;分别采用双荧光素酶报告基因、qRTPCR及免疫印迹检测AKT1、张力蛋白同源基因(Phosphatase and tensin homology deleted on chromosome ten,PTEN)及其磷酸化表达。结果与正常组织表相比,miR-16-1在淋巴瘤病理组织中表达下调,组间比较存在差异(P<0.001);NC组和淋巴瘤组Raji细胞中miR-16-1表达无统计学意义(P>0.05),与NC组相比,miR-16-1组miR-16-1升高,存在差异(P<0.05);NC组和淋巴瘤组细胞存活率无意义(P>0.05),与NC组miR-16-1组细胞存活率降低存在差异(P<0.05);NC组和淋巴瘤组Raji细胞凋亡率无差异(P>0.05),miR-16-1组凋亡率高于NC组,组间无差异(P>0.05);NC组和淋巴瘤组Raji细胞侵袭数目无差异(P>0.05),miR-16-1组侵袭数目低于NC组,存在差异(P<0.05);NC组和淋巴瘤组Raji细胞迁移率比较无差异(P>0.05),miR-16-1组细胞迁移率低于NC组(P<0.05);miR-16-1组细胞中AKT1、PTEN基因及其磷酸化蛋白与NC组、淋巴瘤组比较均存在差异(P<0.05);双荧光素酶报告:与miR-NC相比,miR-16-1mimics可降低野生型AKT1活性,增加野生型PTEN的活性,说明AKT1、PTEN可能是miR-16-1的靶基因。结论人T淋巴瘤细胞Raji转染miR-16-1 mimics后,能够抑制其细胞活性,减少侵袭及迁移,加快凋亡,研究机制可能与调控AKT1、PTEN信号通路活性相关。展开更多
基金This work was supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.2023R1A2C1006268 and RS-2023-00212560).
文摘Objective:To explore the anti-melanogenic potential of Cyrtomium falcatum.Methods:The effects of Cyrtomium falcatum crude extract and its solvent fractions on tyrosinase activity,melanin content,and the expressions of melanogenesis-related genes and proteins were analyzed inα-melanocyte-stimulating hormone(α-MSH)-stimulated B16F10 cells.Results:α-MSH treatment significantly increased tyrosinase activity,and extracellular and intracellular melanin content,as well as the expression levels of tyrosinase,microphthalmia-associated transcription factor(MITF),tyrosinase-related protein(TRP)-1,and TRP-2 in B16F10 cells.Treatment with Cyrtomium falcatum crude extract and its solvent fractions reduced tyrosinase activity and extracellular and intracellular melanin content and downregulated the expression levels of tyrosinase,MITF,TRP-1,and TRP-2 in a dose-dependent manner.Conclusions:Cyrtomium falcatum has potential anti-melanogenesis effects and can be used as a potential source material in cosmeceutical industry for the research and development of novel lead molecules with whitening properties.
文摘Interferon(IFN) with antiviral and im-munomodulatory activities is one of the most important therapeutic agents for the treatment of chronic hepatitis. The apoptotic effect of IFN is influenced by cell type and the types of IFN, which suppresses proliferation and induces apoptosis in some cell types while inhibiting apoptosis in others. The aim of this study was to explore the effect of IFNα-2a on Fas expression and the apoptosis rate of peripheral blood cytotoxic T cells (CTLs) in patients with hepatitis B. METHODS:Peripheral blood mononuclear cells were isolated from 26 patients with hepatitis B including 16 patients with chronic hepatitis B and 10 patients with chronic severe hepatitis B. Fas expression and apoptosis rate of CTLs were analyzed with flow cytometry before and after IFNα-2a treatment. RESULTS:Before IFNα-2a treatment, Fas expression and apoptosis rate of CTLs from patients with chronic hepatitis B were significantly higher than those from patients with chronic severe hepatitis B and healthy controls respectively. No significant difference was observed between Fas expression and apoptosis rate of CTLs from patients with chronic severe hepatitis B and healthy controls. After IFNα-2a treatment,Fas expression and apoptosis rate of CTLs from different groups were compared with those before IFNα-2a treatment, showing no significant difference despite alternation of different degree. CONCLUSIONS:Activation induced cell death (AICD) exists in peripheral blood CTLs from patients with hepatitis B. No effect of IFNα-2a exerts on Fas expression and apoptosis rate of Fas in patients with hepatitis B.
文摘Melanocytes that form stratum basale of skin epidermis express tyrosinase enzyme, which catalyzes initial two rate-limiting steps in the biotransformation of tyrosine into dark pigment called melanin. Even today, Tyrosinase inhibitors are among the promising candidates in cosmetic industry for skin-lightening formulations. Overexpression of tyrosinase causes excess melanin biosynthesis and deposition resulting in dark skin color. Moreover, localized overexpression of tyrosinase cause variety of hyperpigmentation disorders like melanoma, melasma, chloasma, dark patches, liver patches, etc. There has been a renewed interest in the natural products as main ingredients in the formulation of safe products for skin-whitening and treatment options for hyperpigmentation disorders. In the present communication, the results of our investigations on tyrosinase inhibition, modulation of intracellular tyrosinase and melanin levels in cultured B16F10 melanoma cells by Bacopa monnieri (L.) methanol extract (BME) are presented and discussed as safe option for skin lightening and to treat hyperpigmentation disorders. BME showed 11%, 29%, 54% and 80% inhibition of mushroom tyrosinase activity at an initial 100, 200, 400 and 600 μg of extract. Treatment of α-melanocyte stimulating hormone (α-MSH) stimulated cultured murine melanoma B16F10 cells with 100 μg/ml of the extract showed a decrease in the levels of cellular melanin and cellular tyrosinase content by 22% and 46% respectively. The cytotoxicity studies by MTT assay revealed that the LC50 of the BME is ≥1000 μg/ml in cultured mouse melanoma B16F10 and HEK293 cells.
文摘Biophoton emission is produced by all living systems;this emission pattern has been shown to be altered by the presence of an electromagnetic field (EMF). Cultures of B16-BL6 cells were exposed to a weak EMF produced by a specially constructed EM generator, called the “Resonator”, for one hour. This EM generator incorporates multiple geometric ratios in its design, including the golden ratio (phi), pi, root 2, root 3, and root 5. It has been used previously to purify water of toxins. There was a significant decrease in mean photon counts from B16-BL6 cells exposed at a distance of 1 m compared to those exposed at 0 m. Alterations in the spectral power density variability were also observed in the 8 - 10 Hz range. The EM generator may have an impact on the viability of the exposed cell cultures, but only at specific distances.
文摘目的探讨miR-16-1对淋巴瘤细胞凋亡、侵袭及苏氨酸蛋白激酶B(ProteinkinaseB,Akt)1基因作用机制的研究。方法收集我院淋巴瘤患者肿瘤标准及正常胸腺标本,购自上海通派公司的人T淋巴瘤细胞Raji亚系,分为淋巴瘤组(未经转染)、NC组(Raji细胞转染miR-16-1-NC)、miR-16-1组(Raji细胞转染miR-16-1minmics)及药物对照组(Raji细胞联合1mmol/L+10μmol/L的地西他滨),分别采用qRT-PCR方法检测肿瘤及正常组织、Raji细胞的miR-16-1相对表达,分别采用MTT方法、流式细胞仪、Transwell小室方法检测Raji细胞存活率、凋亡率、侵袭数目及迁移率;分别采用双荧光素酶报告基因、qRTPCR及免疫印迹检测AKT1、张力蛋白同源基因(Phosphatase and tensin homology deleted on chromosome ten,PTEN)及其磷酸化表达。结果与正常组织表相比,miR-16-1在淋巴瘤病理组织中表达下调,组间比较存在差异(P<0.001);NC组和淋巴瘤组Raji细胞中miR-16-1表达无统计学意义(P>0.05),与NC组相比,miR-16-1组miR-16-1升高,存在差异(P<0.05);NC组和淋巴瘤组细胞存活率无意义(P>0.05),与NC组miR-16-1组细胞存活率降低存在差异(P<0.05);NC组和淋巴瘤组Raji细胞凋亡率无差异(P>0.05),miR-16-1组凋亡率高于NC组,组间无差异(P>0.05);NC组和淋巴瘤组Raji细胞侵袭数目无差异(P>0.05),miR-16-1组侵袭数目低于NC组,存在差异(P<0.05);NC组和淋巴瘤组Raji细胞迁移率比较无差异(P>0.05),miR-16-1组细胞迁移率低于NC组(P<0.05);miR-16-1组细胞中AKT1、PTEN基因及其磷酸化蛋白与NC组、淋巴瘤组比较均存在差异(P<0.05);双荧光素酶报告:与miR-NC相比,miR-16-1mimics可降低野生型AKT1活性,增加野生型PTEN的活性,说明AKT1、PTEN可能是miR-16-1的靶基因。结论人T淋巴瘤细胞Raji转染miR-16-1 mimics后,能够抑制其细胞活性,减少侵袭及迁移,加快凋亡,研究机制可能与调控AKT1、PTEN信号通路活性相关。