Skin aging shows an imbalance between synthesis and degradation of the extracellular matrix. The overproduction of degradative enzymes (MMPs) during the chronology- and photo-induced aging leads to a degradation of th...Skin aging shows an imbalance between synthesis and degradation of the extracellular matrix. The overproduction of degradative enzymes (MMPs) during the chronology- and photo-induced aging leads to a degradation of the elastic and collagen networks. In a model of collagen and elastin destruction, we showed that the gingival fibroblast was able to preserve these macromolecules by inhibiting the overproduction of metalloproteinases by overproduction of TIMP-1 and modulation of the inflammatory cytokines activity. The objective of this study is to evaluate the effect of the gingival fibroblasts on human skin. The results in vitro and ex vivo show that the gingival fibroblast protects the skin collagen and elastic network by the inhibition of MMPs which leads to an overproduction of the TIMP-1. Moreover, the gingival fibroblast modulates the activity of some enzymes responsible for the inflammation;they inhibit the IL-1β and stimulate the production of TGF-β1. In vivo studies with a duration of six months and 50 women with pronounced wrinkles show that the culture supernatant of gingival fibroblasts diluted to 5% leads to a statistically significant decrease in the number and length of wrinkles.展开更多
Cardiac extracellular matrices(ECM)play crucial functional roles in cardiac biomechanics.Previous studies have mainly focused on collagen,the major structural ECM in heart wall.The role of elastin in cardiac mechanics...Cardiac extracellular matrices(ECM)play crucial functional roles in cardiac biomechanics.Previous studies have mainly focused on collagen,the major structural ECM in heart wall.The role of elastin in cardiac mechanics,however,is poorly understood.In this study,we investigated the spatial distribution and microstructural morphologies of cardiac elastin in porcine left ventricles.We demonstrated that the epicardial elastin network had location-and depth-dependency,and the overall epicardial elastin fiber mapping showed certain correlation with the helical heart muscle fiber architecture.When compared to the epicardial layer,the endocardial layer was thicker and has a higher elastin-collagen ratio and a denser elastin fiber network;moreover,the endocardial elastin fibers were finer and more wavy than the epicardial elastin fibers,all suggesting various interface mechanics.The myocardial interstitial elastin fibers co-exist with the perimysial collagen to bind the cardiomyocyte bundles;some of the interstitial elastin fibers showed a locally aligned,hinge-like structure to connect the adjacent cardiomyocyte bundles.This collagen-elastin combination reflects an optimal design in which the collagen provides mechanical strength and elastin fibers facilitate recoiling during systole.Moreover,cardiac elastin fibers,along with collagen network,closely associated with the Purkinje cells,indicating that this ECM association could be essential in organizing cardiac Purkinje cells into“fibrous”and“branching”morphologies and serving as a protective feature when Purkinje fibers experience large deformations in vivo.In short,our observations provide a structural basis for future in-depth biomechanical investigations and biomimicking of this long-overlooked cardiac ECM component.展开更多
Background Elastin derived peptides can regulate melanocyte precursor development. Ultraviolet irradiation, infrared radiation and heat can increase the synthesis of tropoelastin in human skin epidermis. The aim of th...Background Elastin derived peptides can regulate melanocyte precursor development. Ultraviolet irradiation, infrared radiation and heat can increase the synthesis of tropoelastin in human skin epidermis. The aim of this study was to investigate whether the over expressed tropoelastin in epidermis has some role in melanogenesis of melanocytes. Methods A375 human melanoma cells were treated with different concentrations of kappa elastin for 24 hours. A375 human melanoma cells were randomly assigned to control, kappa elastin, and lactose pre-incubated groups. The cell viabilities were detected by the methyl thiazoleterazolium assay. Melanin content and tyrosinase activity in A375 melanoma cells were measured. The expressions of endothelin B receptor （ETBR） mRNA and c-kit mRNA in A375 melanoma cells were measured by quantative reverse transcription polymerase chain reaction. Results Fifty pg/ml of kappa elastin significantly increased the melanin content by 56.64% compared with the control （P 〈0.05）. Kappa elastin increased cellular tyrosinase activity by 46.73% compared with the control at 24 hours （P 〈0.05）. Kappa elastin increased the expressions of ETBR and c-kit mRNA levels by 2.13-fold and 2.47-fold compared with the controls, respectively. When pre-incubating cells with a lactose solution （10 mmol/L）, the inhibition on melanin production was 34.96% compared with the kappa elastin group （P 〈0.05）, tyrosinase activity was inhibited by 29.93% compared with kappa elastin group （P 〈0.05）, and the expressions of ETBR mRNA and c-kit mRNA were decreased by 1.56-fold and 0.82-fold compared with kappa elastin group, respectively. Conclusion Kappa elastin increased the melanogenesis in A375 melanoma cells via the stimulation of tyrosinase activity and the expression of ETBR and c-kit. The over expressed tropoelastin produced by keratinocytes might play a role in melanogenesis of epidermal melanocytes.展开更多
目的研究肝细胞癌(hepatocellular carcinoma,HCC)组织中趋化因子受激活调节正常T细胞表达和分泌因子(regulated-upon activation normal T expressed and secreted,RANTES)和弹性蛋白(elastin)的表达水平,并探讨其临床病理意义。方法选...目的研究肝细胞癌(hepatocellular carcinoma,HCC)组织中趋化因子受激活调节正常T细胞表达和分泌因子(regulated-upon activation normal T expressed and secreted,RANTES)和弹性蛋白(elastin)的表达水平,并探讨其临床病理意义。方法选择42例手术切除的HCC癌组织和癌旁组织标本,常规石蜡包埋切片后ABC免疫组化法检测RAN-TES和elastin的表达情况。结果 42例HCC癌组织中RANTES和elastin的表达阳性率和表达评分均显著高于癌旁组织:RANTES5,4.8%vs 19.0%(P<0.01)1,.88±1.78 vs 0.69±1.28(P<0.01);elastin,45.2%vs 19.0%(P<0.05),1.64±1.85 vs 0.66±1.28(P<0.01);RANTES和elastin的表达情况与HCC的主要临床病理特征无明显关系;相关性分析显示HCC癌组织中RANTES和elastin的表达评分呈正相关(r=0.445,P<0.05)。结论 RANTES和elastin的表达与HCC的发生、发展可能关系密切;elastin与趋化因子RANTES密切相关。展开更多
文摘Skin aging shows an imbalance between synthesis and degradation of the extracellular matrix. The overproduction of degradative enzymes (MMPs) during the chronology- and photo-induced aging leads to a degradation of the elastic and collagen networks. In a model of collagen and elastin destruction, we showed that the gingival fibroblast was able to preserve these macromolecules by inhibiting the overproduction of metalloproteinases by overproduction of TIMP-1 and modulation of the inflammatory cytokines activity. The objective of this study is to evaluate the effect of the gingival fibroblasts on human skin. The results in vitro and ex vivo show that the gingival fibroblast protects the skin collagen and elastic network by the inhibition of MMPs which leads to an overproduction of the TIMP-1. Moreover, the gingival fibroblast modulates the activity of some enzymes responsible for the inflammation;they inhibit the IL-1β and stimulate the production of TGF-β1. In vivo studies with a duration of six months and 50 women with pronounced wrinkles show that the culture supernatant of gingival fibroblasts diluted to 5% leads to a statistically significant decrease in the number and length of wrinkles.
基金support:R01EB022018,R15HL140503,T32 HL134613 from NIH,UT STARS.
文摘Cardiac extracellular matrices(ECM)play crucial functional roles in cardiac biomechanics.Previous studies have mainly focused on collagen,the major structural ECM in heart wall.The role of elastin in cardiac mechanics,however,is poorly understood.In this study,we investigated the spatial distribution and microstructural morphologies of cardiac elastin in porcine left ventricles.We demonstrated that the epicardial elastin network had location-and depth-dependency,and the overall epicardial elastin fiber mapping showed certain correlation with the helical heart muscle fiber architecture.When compared to the epicardial layer,the endocardial layer was thicker and has a higher elastin-collagen ratio and a denser elastin fiber network;moreover,the endocardial elastin fibers were finer and more wavy than the epicardial elastin fibers,all suggesting various interface mechanics.The myocardial interstitial elastin fibers co-exist with the perimysial collagen to bind the cardiomyocyte bundles;some of the interstitial elastin fibers showed a locally aligned,hinge-like structure to connect the adjacent cardiomyocyte bundles.This collagen-elastin combination reflects an optimal design in which the collagen provides mechanical strength and elastin fibers facilitate recoiling during systole.Moreover,cardiac elastin fibers,along with collagen network,closely associated with the Purkinje cells,indicating that this ECM association could be essential in organizing cardiac Purkinje cells into“fibrous”and“branching”morphologies and serving as a protective feature when Purkinje fibers experience large deformations in vivo.In short,our observations provide a structural basis for future in-depth biomechanical investigations and biomimicking of this long-overlooked cardiac ECM component.
基金This study was supported by a grant from the National Natural Science Foundation of China
文摘Background Elastin derived peptides can regulate melanocyte precursor development. Ultraviolet irradiation, infrared radiation and heat can increase the synthesis of tropoelastin in human skin epidermis. The aim of this study was to investigate whether the over expressed tropoelastin in epidermis has some role in melanogenesis of melanocytes. Methods A375 human melanoma cells were treated with different concentrations of kappa elastin for 24 hours. A375 human melanoma cells were randomly assigned to control, kappa elastin, and lactose pre-incubated groups. The cell viabilities were detected by the methyl thiazoleterazolium assay. Melanin content and tyrosinase activity in A375 melanoma cells were measured. The expressions of endothelin B receptor （ETBR） mRNA and c-kit mRNA in A375 melanoma cells were measured by quantative reverse transcription polymerase chain reaction. Results Fifty pg/ml of kappa elastin significantly increased the melanin content by 56.64% compared with the control （P 〈0.05）. Kappa elastin increased cellular tyrosinase activity by 46.73% compared with the control at 24 hours （P 〈0.05）. Kappa elastin increased the expressions of ETBR and c-kit mRNA levels by 2.13-fold and 2.47-fold compared with the controls, respectively. When pre-incubating cells with a lactose solution （10 mmol/L）, the inhibition on melanin production was 34.96% compared with the kappa elastin group （P 〈0.05）, tyrosinase activity was inhibited by 29.93% compared with kappa elastin group （P 〈0.05）, and the expressions of ETBR mRNA and c-kit mRNA were decreased by 1.56-fold and 0.82-fold compared with kappa elastin group, respectively. Conclusion Kappa elastin increased the melanogenesis in A375 melanoma cells via the stimulation of tyrosinase activity and the expression of ETBR and c-kit. The over expressed tropoelastin produced by keratinocytes might play a role in melanogenesis of epidermal melanocytes.
文摘目的研究肝细胞癌(hepatocellular carcinoma,HCC)组织中趋化因子受激活调节正常T细胞表达和分泌因子(regulated-upon activation normal T expressed and secreted,RANTES)和弹性蛋白(elastin)的表达水平,并探讨其临床病理意义。方法选择42例手术切除的HCC癌组织和癌旁组织标本,常规石蜡包埋切片后ABC免疫组化法检测RAN-TES和elastin的表达情况。结果 42例HCC癌组织中RANTES和elastin的表达阳性率和表达评分均显著高于癌旁组织:RANTES5,4.8%vs 19.0%(P<0.01)1,.88±1.78 vs 0.69±1.28(P<0.01);elastin,45.2%vs 19.0%(P<0.05),1.64±1.85 vs 0.66±1.28(P<0.01);RANTES和elastin的表达情况与HCC的主要临床病理特征无明显关系;相关性分析显示HCC癌组织中RANTES和elastin的表达评分呈正相关(r=0.445,P<0.05)。结论 RANTES和elastin的表达与HCC的发生、发展可能关系密切;elastin与趋化因子RANTES密切相关。
