Objective To investigate the optimal dosage of pirfenidone for the treatment of pulmonary fibrosis induced by bleomycin in Wistar rats, and the alteration of expressions of transforming growth factor beta-1 （ TGF-β1...Objective To investigate the optimal dosage of pirfenidone for the treatment of pulmonary fibrosis induced by bleomycin in Wistar rats, and the alteration of expressions of transforming growth factor beta-1 （ TGF-β1 ）, tissue inhibitor of metalloproteinase-1 （ TIMP-1 ）, and matrix metalloproteinase-13 （ MMP-13 ） in lung tissue. Methods Male Wistar rats were endotracheally instilled with bleomycin or normal saline. Pirfenidone （25-800 mg · kg^-l · d^-1 ）, dexamethasone （3 mg/kg）, or 1% carboxymethylcellulose sodium were given daily by feed 2 days before instillation of bleomycin. Groups T7 and T14 were fed pirfenidone 50 mg · kg^-1 · d^-1 at 7 days or 14 daYs after bleomycin instillation. Lungs were harvested at 28 days after bleomycin instillation. Patholological changes in luffg tissues were evaluated with HE staining. Lung collagen was stained by sirius red and measured by content of hydroxypro- line. Expression of proteins of TGF-β1 TIMP-1, and MMP-13 were detected by Western blotting. Results At doses of 25, 50, and 100 mg· kg^- 1 · d ^- 1, pirfenidone had significant anti-fibrotic effects for bleomy- cin-induced rat pulmonary fibrosis, and these effects were most significantly attenuated at the dosage of 50 mg · kg^-1 ·d^ -1（ HE： P 〈 0. 01, P 〈 0.01, and P = 0.064; sirius red： P 〈0.05, P 〈 0.01, and P 〈 0.05 ; hydroxyproline： P = 0.595, P 〈 0.01, and P = 0.976）. Pirfenidone at a dosage of 50 mg · kg^- l · d^-1 inhibited protein expression of TGF-131 and TIMP-1 in lung tissue in the early phase （0.79 and 0.75 times of control group）, but had no effect on ex- nr^eelnn nf MMP-13. Conclusion Low dose pirfenidone, especially at dosage of 50 mg · kg^-1 · d^-1, has significant anti-fibrotic effects on bleomycin-induced rat pulmonary fibrosis. Pirfenidone partially inhibits the enhancement of the expression of TGF-131 and TIMP-β1 in lung tissue.展开更多
TGF-β is a multifunctional cytokine that regulates many aspects of cellular function, including periosteal mesenchymal cell proliferation, differentiation. This experiment is to study its effects on bone defect repai...TGF-β is a multifunctional cytokine that regulates many aspects of cellular function, including periosteal mesenchymal cell proliferation, differentiation. This experiment is to study its effects on bone defect repair. A rabbit radial bone defect model was used to evaluate the effect of TGF-β, which was extracted and purified from bovine blood platelets, on the healing of a large segmental osteoperiosteal defect. A 1. 5-centimeter segmental defect was created in the mid-upper part of the radial shaft of adult rabbits. The defect was filled with implant containing TGF-β that consisted of carrier and bovine TGF-β. Limbs served as controls received carrier alone. The defectswere examined radiographically and histologically at 4, 8,12 , 16 and 20 weeks after implantation. The results showed that in TGF-β implant group . the defect areas at 12 weeks post operation were bridged by uniform new bone and the cut ends of cortex could not be seen;while in control group, the defects remained clear. Only a small amount of new bone formed as a cap on the cut bone ends. In the experimental group, new lamellar and woven bone formed in continuity with the cut ends of the cortex. An early medullar canal appears to be forming and contained normal-appearancing marrow elements; while the control group displayed entirely fibrous tissue within the defect site. Remnants of the cancellous bone carrier were observed in the control specimen. These data demonstrate that exogenous TGF-β initiate osteogenesis and stimulate the bone defects repair in animal model.展开更多
Liver fibrosis is a common pathological consequence of a variety of chronic stimuli, including viral, autoimmune, drug-induced, cholestatic and metabolic diseases. Fibrosis is driven by a dynamic process involving inc...Liver fibrosis is a common pathological consequence of a variety of chronic stimuli, including viral, autoimmune, drug-induced, cholestatic and metabolic diseases. Fibrosis is driven by a dynamic process involving increased synthesis of matrix components and a failure of physiological mechanisms of matrix turnover. Activation of hepatic stellate cells(HSCs) remains a central event in fibrosis. HSCs are the main source of extracellular matrix(ECM). Transforming growth factor-beta(TGF-β), which is the fibrogenic master cytokine, can induce the activation of HSCs to produce a large amount of ECM, and is capable of inducing apoptosis of liver cells. RNA interference(RNAi) is a novel gene disruption technology. Studies have shown that small interfering RNA(si RNA) targeting TGF-β1 may inhibit the activation and proliferation of HSCs, suppress ECM synthesis and block liver fibrosis. TGF-β1 si RNA-mediated gene silencing therapy provides a new avenue for liver fibrosis. This review summarizes recent progresses in research on HSCs, TGF-β1 and TGF-β1 si RNA in liver fibrosis.展开更多
Objective: To investigate the expression and the role of transforming growth factor 6 (TGF-β) receptors in CCI4 --Induced cirrhotic liver. Methods: In situ hybridization was used. Results: The TGF--β type I receptor...Objective: To investigate the expression and the role of transforming growth factor 6 (TGF-β) receptors in CCI4 --Induced cirrhotic liver. Methods: In situ hybridization was used. Results: The TGF--β type I receptors mRNA was mainly expressed in Ito cells, endothelial cells and myofibroblasts. Only a few hepatocytes expressed it. However. the TGF-β type Ⅱ receptors was mostly localized in endothelial cells and Ito cells but few hepatocytes. The expression of mRNA of both the 2 types of receptors were significantly increased in the cirrhotic liver than in the control. Conclusion: The autocrine and paracrine effects of TGF-β on matrix production and activation of Ito cells might be an important factor of fibrogenesis in CCI4 cirrhotic ever.展开更多
Objective. This study was to investigate the effects of transforming growth factor-β(TGFβ) and fi- broblast growth factor (FGF) in the subcapsular opacification formation of the lens. Methods. Lens epithelial explan...Objective. This study was to investigate the effects of transforming growth factor-β(TGFβ) and fi- broblast growth factor (FGF) in the subcapsular opacification formation of the lens. Methods. Lens epithelial explants from 10-day-old rats were cultured with TGFβ1 or TGFβ2 in the presence of FGF for 5 days, then were examined by light and electron microscopy, and by immunolocal- ization of smooth muscle(α-sm) actin and type I collagen. Results. In TGFβ/FGF-treated explants,extensive proliferation occured, with formation of spindle and star-shaped cells. These cells showed ultrastructure and biochemical features of fibroblast or myofibroblast. Prominent Golgi apparatus and rough endoplaic reticulum were observed in some cells. Intracellular micro- filaments with cytoplasmic dense babies and membrane associated dense bodies, features of smooth muscle cells, were also observed. Some cells showed reactivity to -sin actin antibody. TGFβ/FGF-treated ex- plants were strongly stained with type I collagen antibody. Condusion. In the presence of FGF, TGFβ1 and TGFβ2 induced lens epithelial cell (LEC ) proliferation and transformation into fibroblast or myofibroblast-like cells, with producing of abundant collagen matrix in the explants. The changes are similar to the metaplasia that occurrs in subcapsular opacification of the lens. The findings suggest that TGFβ and FGF plays a role in the pathogenesis of subcapsular opacification of the lens.展开更多
Background: The carcinogenesis of hepatocellular carcinoma (HCC) is a multi-factorial, multistep and complex process. Its prognosis is poor and early detection is of the utmost importance. Transforming growth factor ...Background: The carcinogenesis of hepatocellular carcinoma (HCC) is a multi-factorial, multistep and complex process. Its prognosis is poor and early detection is of the utmost importance. Transforming growth factor β1 (TGF-β1) message RNA (mRNA) has been reported to be elevated in HCC patients using Northern blotting. However, little work has been done about the detection of TGF-β1 mRNA levels in peripheral blood of patients with HCC using the real-time polymerase chain reactions (PCR) method. Objective: To assess the prognostic value of quantitative levels of TGF-β1 mRNA in peripheral blood of patients with HCC, and to investigate the relationship between the expression of TGF-β1 mRNA in peripheral blood and many diagnostic and pathological factors. Methods: We developed an optimized Taqman real-time PCR to quantify TGF-β1 mRNA in peripheral blood of 53 patients with HCC and 44 healthy volunteers. In addition, blood was collected from patients with HCC for measuring levels of total bilirubin (TBil), prealbumin, albumin, alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma glutamyltranspeptidase (GGT), alpha-L-fucosidase (AFU), alpha fetoprotein (AFP), carcino-embryonic antigen (CEA), carbohydrate antigen 19-9 (CA19-9), viral load and platelet counts. Statistical analysis was performed using the SPSS software system (SPSS 10.0). Results: In real-time PCR, fluorescence was detectable in all blood specimens from patients with HCC and healthy volunteers. The levels of TGF-β1 mRNA expression in patients with HCC were significantly higher compared to that in healthy volunteers (P<0.000 1), suggesting an association of the activated TGF-β1 gene transcription with hepato- carcinogenesis. Patients with HCC were divided into 2 groups according to their TGF-β1 mRNA above (group A, n=28)or below (group B, n=25) the mean level. Statistical results demonstrated that TGF-β1 mRNA expression level was correlated with patients age, serum levels of CEA, CA19-9 and viral copy number (P<0.05). Conclusion: Although this is a small sample size pilot study these findings imply that quantitative measurement of TGF-β1 mRNA level in peripheral blood may be a complementary serologic marker of HCC.展开更多
Objective: To analyze and compare the expression pattern of the transforming growth factor-β1(TGF-β1) and its type I receptor (TGF-β RI ) in nounal human skin and various phases of post-burn hypertrophic scars (HTS...Objective: To analyze and compare the expression pattern of the transforming growth factor-β1(TGF-β1) and its type I receptor (TGF-β RI ) in nounal human skin and various phases of post-burn hypertrophic scars (HTS). Method: The immunohistochemical ABC method was employed. Results: In nounal human skin, no evident immunoreactivity of TGF-β1 and TGF-β R I was observed. In activation phase of post-burn HTS, TGF-β R I and TGF-β1 were highly expressed in most dermal fibroblasts which seemed to be the same subset. However, in remission phase, no staining was seen in der mal fibroblasts. Conclusion: The formation of all may involve the increase of TGF-β responsiveness in fibroblasts The ac cumulation at the wound site and failure of apoptosis of over-resposive fibroblasts may contribute to the formation of HTS.展开更多
Using normal brain cell geneomic DNA as a template,transforming growth factor(TGFa)-IV exon gene was amplified by polymerase chain reaction(PCR). The sequence of amplified fragment was analysed with a DNA sequencing k...Using normal brain cell geneomic DNA as a template,transforming growth factor(TGFa)-IV exon gene was amplified by polymerase chain reaction(PCR). The sequence of amplified fragment was analysed with a DNA sequencing kit.The results showed that the cloned fragment is proved to be the TGFa-IV exon gene.展开更多
A typical biological cell lives in a small volmne at room temperature; the noise effect on the cell signal transduction pathway may play an important role in its dynamics. Here, using the transforming growth factor-β...A typical biological cell lives in a small volmne at room temperature; the noise effect on the cell signal transduction pathway may play an important role in its dynamics. Here, using the transforming growth factor-β signal transduction pathway as an example, we report our stochastic simulations of the dynamics of the pathway and introduce a linear noise approximation method to calculate the transient intrinsic noise of pathway components. We compare the numerical solutions of the linear noise approximation with the statistic results of chemical Langevin equations, and find that they are quantitatively in agreement with the other. When transforming growth factor-β dose decreases to a low level, the time evolution of noise fluctuation of nuclear Smad2-Smad4 complex indicates the abnormal enhancement in the transient signal activation process.展开更多
Transforming growth factor-β (TGF-β) and bone morphogenetic protein (BMP)were related to embryonic development and the differentiation of many types of cells. Recent studies showed that they might play an important ...Transforming growth factor-β (TGF-β) and bone morphogenetic protein (BMP)were related to embryonic development and the differentiation of many types of cells. Recent studies showed that they might play an important role in regulating the differentiation o展开更多
目的探究微小RNA-195-5p(microRNA-195-5p,miR-195-5p)对心房颤动(atrial fibrillation,AF)大鼠心肌纤维化的影响与机制。方法选择雄性SD大鼠72只,随机分为对照组、AF组、阴性对照组、miR-195-5p组(miR-195-5p抑制剂)、9型重组腺相关病...目的探究微小RNA-195-5p(microRNA-195-5p,miR-195-5p)对心房颤动(atrial fibrillation,AF)大鼠心肌纤维化的影响与机制。方法选择雄性SD大鼠72只,随机分为对照组、AF组、阴性对照组、miR-195-5p组(miR-195-5p抑制剂)、9型重组腺相关病毒(recombinant adeno-associated virus serotype 9,rAAV9)组(miR-195-5p抑制剂+rAAV9-阴性对照)、联合组[miR-195-5p抑制剂+rAAV9-小干扰RNA-SMAD同源物(SMAD homolog,Smad)]7,每组12只。除对照组外,其他组大鼠构建AF模型。给予对应干预措施后,进行心电图测试,记录AF发生率和持续时间;HE染色检测心肌组织病理变化;Masson染色检测心肌组织纤维化程度;实时荧光定量聚合酶链反应检测心肌组织miR-195-5p、Smad7mRNA表达;Western blot检测心肌组织转化生长因子β_(1)(transforming growth factor-β_(1),TGF-β_(1))、Smad2、磷酸化Smad2、Smad3、磷酸化Smad3、Smad7、Ⅰ型胶原蛋白(Collagen-Ⅰ)、Ⅲ型胶原蛋白(Collagen-Ⅲ)表达;双荧光素酶实验验证miR-195-5p对Smad7的调控作用。结果与对照组比较,AF组AF发生率(75.0%vs 0)和持续时间[(27.02±2.65)s vs 0s]、胶原容积分数[(14.47±0.89)%vs(2.12±0.35)%]、心肌组织miR-195-5p(3.27±0.21 vs 1.00±0.10)、TGF-β_(1)(0.76±0.08 vs 0.23±0.04)、Collagen-Ⅰ(0.58±0.07 vs 0.20±0.04)、Collagen-Ⅲ(0.46±0.05 vs 0.11±0.02)、磷酸化Smad2/Smad2(0.92±0.10 vs 0.37±0.05)、磷酸化Smad3/Smad3(0.65±0.06 vs 0.14±0.03)表达明显升高,Smad7mRNA(0.32±0.06 vs 1.02±0.09)和Smad7(0.19±0.03 vs 0.58±0.07)表达明显降低,差异有统计学意义(P<0.05);与AF组和阴性对照组比较,miR-195-5p组AF发生率和持续时间、胶原容积分数、心肌组织miR-195-5p、TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显降低,Smad7mRNA和蛋白表达明显升高,差异有统计学意义(P<0.05);与miR-195-5p组和rAAV9组比较,联合组AF发生率和持续时间、胶原容积分数、心肌组织TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显升高,Smad7mRNA和Smad7表达明显降低,差异有统计学意义(P<0.05)。结论下调miR-195-5p可能靶向Smad7抑制TGF-β_(1)信号传导,从而减轻AF心肌纤维化。展开更多
基金Supported by National Ministry of Education Doctor Foundation of China(20020023045)
文摘Objective To investigate the optimal dosage of pirfenidone for the treatment of pulmonary fibrosis induced by bleomycin in Wistar rats, and the alteration of expressions of transforming growth factor beta-1 （ TGF-β1 ）, tissue inhibitor of metalloproteinase-1 （ TIMP-1 ）, and matrix metalloproteinase-13 （ MMP-13 ） in lung tissue. Methods Male Wistar rats were endotracheally instilled with bleomycin or normal saline. Pirfenidone （25-800 mg · kg^-l · d^-1 ）, dexamethasone （3 mg/kg）, or 1% carboxymethylcellulose sodium were given daily by feed 2 days before instillation of bleomycin. Groups T7 and T14 were fed pirfenidone 50 mg · kg^-1 · d^-1 at 7 days or 14 daYs after bleomycin instillation. Lungs were harvested at 28 days after bleomycin instillation. Patholological changes in luffg tissues were evaluated with HE staining. Lung collagen was stained by sirius red and measured by content of hydroxypro- line. Expression of proteins of TGF-β1 TIMP-1, and MMP-13 were detected by Western blotting. Results At doses of 25, 50, and 100 mg· kg^- 1 · d ^- 1, pirfenidone had significant anti-fibrotic effects for bleomy- cin-induced rat pulmonary fibrosis, and these effects were most significantly attenuated at the dosage of 50 mg · kg^-1 ·d^ -1（ HE： P 〈 0. 01, P 〈 0.01, and P = 0.064; sirius red： P 〈0.05, P 〈 0.01, and P 〈 0.05 ; hydroxyproline： P = 0.595, P 〈 0.01, and P = 0.976）. Pirfenidone at a dosage of 50 mg · kg^- l · d^-1 inhibited protein expression of TGF-131 and TIMP-1 in lung tissue in the early phase （0.79 and 0.75 times of control group）, but had no effect on ex- nr^eelnn nf MMP-13. Conclusion Low dose pirfenidone, especially at dosage of 50 mg · kg^-1 · d^-1, has significant anti-fibrotic effects on bleomycin-induced rat pulmonary fibrosis. Pirfenidone partially inhibits the enhancement of the expression of TGF-131 and TIMP-β1 in lung tissue.
文摘TGF-β is a multifunctional cytokine that regulates many aspects of cellular function, including periosteal mesenchymal cell proliferation, differentiation. This experiment is to study its effects on bone defect repair. A rabbit radial bone defect model was used to evaluate the effect of TGF-β, which was extracted and purified from bovine blood platelets, on the healing of a large segmental osteoperiosteal defect. A 1. 5-centimeter segmental defect was created in the mid-upper part of the radial shaft of adult rabbits. The defect was filled with implant containing TGF-β that consisted of carrier and bovine TGF-β. Limbs served as controls received carrier alone. The defectswere examined radiographically and histologically at 4, 8,12 , 16 and 20 weeks after implantation. The results showed that in TGF-β implant group . the defect areas at 12 weeks post operation were bridged by uniform new bone and the cut ends of cortex could not be seen;while in control group, the defects remained clear. Only a small amount of new bone formed as a cap on the cut bone ends. In the experimental group, new lamellar and woven bone formed in continuity with the cut ends of the cortex. An early medullar canal appears to be forming and contained normal-appearancing marrow elements; while the control group displayed entirely fibrous tissue within the defect site. Remnants of the cancellous bone carrier were observed in the control specimen. These data demonstrate that exogenous TGF-β initiate osteogenesis and stimulate the bone defects repair in animal model.
基金Supported by National Natural Science Foundation of China(81373465)
文摘Liver fibrosis is a common pathological consequence of a variety of chronic stimuli, including viral, autoimmune, drug-induced, cholestatic and metabolic diseases. Fibrosis is driven by a dynamic process involving increased synthesis of matrix components and a failure of physiological mechanisms of matrix turnover. Activation of hepatic stellate cells(HSCs) remains a central event in fibrosis. HSCs are the main source of extracellular matrix(ECM). Transforming growth factor-beta(TGF-β), which is the fibrogenic master cytokine, can induce the activation of HSCs to produce a large amount of ECM, and is capable of inducing apoptosis of liver cells. RNA interference(RNAi) is a novel gene disruption technology. Studies have shown that small interfering RNA(si RNA) targeting TGF-β1 may inhibit the activation and proliferation of HSCs, suppress ECM synthesis and block liver fibrosis. TGF-β1 si RNA-mediated gene silencing therapy provides a new avenue for liver fibrosis. This review summarizes recent progresses in research on HSCs, TGF-β1 and TGF-β1 si RNA in liver fibrosis.
文摘Objective: To investigate the expression and the role of transforming growth factor 6 (TGF-β) receptors in CCI4 --Induced cirrhotic liver. Methods: In situ hybridization was used. Results: The TGF--β type I receptors mRNA was mainly expressed in Ito cells, endothelial cells and myofibroblasts. Only a few hepatocytes expressed it. However. the TGF-β type Ⅱ receptors was mostly localized in endothelial cells and Ito cells but few hepatocytes. The expression of mRNA of both the 2 types of receptors were significantly increased in the cirrhotic liver than in the control. Conclusion: The autocrine and paracrine effects of TGF-β on matrix production and activation of Ito cells might be an important factor of fibrogenesis in CCI4 cirrhotic ever.
文摘Objective. This study was to investigate the effects of transforming growth factor-β(TGFβ) and fi- broblast growth factor (FGF) in the subcapsular opacification formation of the lens. Methods. Lens epithelial explants from 10-day-old rats were cultured with TGFβ1 or TGFβ2 in the presence of FGF for 5 days, then were examined by light and electron microscopy, and by immunolocal- ization of smooth muscle(α-sm) actin and type I collagen. Results. In TGFβ/FGF-treated explants,extensive proliferation occured, with formation of spindle and star-shaped cells. These cells showed ultrastructure and biochemical features of fibroblast or myofibroblast. Prominent Golgi apparatus and rough endoplaic reticulum were observed in some cells. Intracellular micro- filaments with cytoplasmic dense babies and membrane associated dense bodies, features of smooth muscle cells, were also observed. Some cells showed reactivity to -sin actin antibody. TGFβ/FGF-treated ex- plants were strongly stained with type I collagen antibody. Condusion. In the presence of FGF, TGFβ1 and TGFβ2 induced lens epithelial cell (LEC ) proliferation and transformation into fibroblast or myofibroblast-like cells, with producing of abundant collagen matrix in the explants. The changes are similar to the metaplasia that occurrs in subcapsular opacification of the lens. The findings suggest that TGFβ and FGF plays a role in the pathogenesis of subcapsular opacification of the lens.
基金the National Natural Science Foundation of China (30770994)
文摘Background: The carcinogenesis of hepatocellular carcinoma (HCC) is a multi-factorial, multistep and complex process. Its prognosis is poor and early detection is of the utmost importance. Transforming growth factor β1 (TGF-β1) message RNA (mRNA) has been reported to be elevated in HCC patients using Northern blotting. However, little work has been done about the detection of TGF-β1 mRNA levels in peripheral blood of patients with HCC using the real-time polymerase chain reactions (PCR) method. Objective: To assess the prognostic value of quantitative levels of TGF-β1 mRNA in peripheral blood of patients with HCC, and to investigate the relationship between the expression of TGF-β1 mRNA in peripheral blood and many diagnostic and pathological factors. Methods: We developed an optimized Taqman real-time PCR to quantify TGF-β1 mRNA in peripheral blood of 53 patients with HCC and 44 healthy volunteers. In addition, blood was collected from patients with HCC for measuring levels of total bilirubin (TBil), prealbumin, albumin, alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma glutamyltranspeptidase (GGT), alpha-L-fucosidase (AFU), alpha fetoprotein (AFP), carcino-embryonic antigen (CEA), carbohydrate antigen 19-9 (CA19-9), viral load and platelet counts. Statistical analysis was performed using the SPSS software system (SPSS 10.0). Results: In real-time PCR, fluorescence was detectable in all blood specimens from patients with HCC and healthy volunteers. The levels of TGF-β1 mRNA expression in patients with HCC were significantly higher compared to that in healthy volunteers (P<0.000 1), suggesting an association of the activated TGF-β1 gene transcription with hepato- carcinogenesis. Patients with HCC were divided into 2 groups according to their TGF-β1 mRNA above (group A, n=28)or below (group B, n=25) the mean level. Statistical results demonstrated that TGF-β1 mRNA expression level was correlated with patients age, serum levels of CEA, CA19-9 and viral copy number (P<0.05). Conclusion: Although this is a small sample size pilot study these findings imply that quantitative measurement of TGF-β1 mRNA level in peripheral blood may be a complementary serologic marker of HCC.
文摘Objective: To analyze and compare the expression pattern of the transforming growth factor-β1(TGF-β1) and its type I receptor (TGF-β RI ) in nounal human skin and various phases of post-burn hypertrophic scars (HTS). Method: The immunohistochemical ABC method was employed. Results: In nounal human skin, no evident immunoreactivity of TGF-β1 and TGF-β R I was observed. In activation phase of post-burn HTS, TGF-β R I and TGF-β1 were highly expressed in most dermal fibroblasts which seemed to be the same subset. However, in remission phase, no staining was seen in der mal fibroblasts. Conclusion: The formation of all may involve the increase of TGF-β responsiveness in fibroblasts The ac cumulation at the wound site and failure of apoptosis of over-resposive fibroblasts may contribute to the formation of HTS.
文摘Using normal brain cell geneomic DNA as a template,transforming growth factor(TGFa)-IV exon gene was amplified by polymerase chain reaction(PCR). The sequence of amplified fragment was analysed with a DNA sequencing kit.The results showed that the cloned fragment is proved to be the TGFa-IV exon gene.
基金Project supported by the National Natural Science Foundation of China (Grant No. 10721403)the National Basic Research Program of China (Grant No. 2009CB918500)
文摘A typical biological cell lives in a small volmne at room temperature; the noise effect on the cell signal transduction pathway may play an important role in its dynamics. Here, using the transforming growth factor-β signal transduction pathway as an example, we report our stochastic simulations of the dynamics of the pathway and introduce a linear noise approximation method to calculate the transient intrinsic noise of pathway components. We compare the numerical solutions of the linear noise approximation with the statistic results of chemical Langevin equations, and find that they are quantitatively in agreement with the other. When transforming growth factor-β dose decreases to a low level, the time evolution of noise fluctuation of nuclear Smad2-Smad4 complex indicates the abnormal enhancement in the transient signal activation process.
文摘Transforming growth factor-β (TGF-β) and bone morphogenetic protein (BMP)were related to embryonic development and the differentiation of many types of cells. Recent studies showed that they might play an important role in regulating the differentiation o
文摘目的探究微小RNA-195-5p(microRNA-195-5p,miR-195-5p)对心房颤动(atrial fibrillation,AF)大鼠心肌纤维化的影响与机制。方法选择雄性SD大鼠72只,随机分为对照组、AF组、阴性对照组、miR-195-5p组(miR-195-5p抑制剂)、9型重组腺相关病毒(recombinant adeno-associated virus serotype 9,rAAV9)组(miR-195-5p抑制剂+rAAV9-阴性对照)、联合组[miR-195-5p抑制剂+rAAV9-小干扰RNA-SMAD同源物(SMAD homolog,Smad)]7,每组12只。除对照组外,其他组大鼠构建AF模型。给予对应干预措施后,进行心电图测试,记录AF发生率和持续时间;HE染色检测心肌组织病理变化;Masson染色检测心肌组织纤维化程度;实时荧光定量聚合酶链反应检测心肌组织miR-195-5p、Smad7mRNA表达;Western blot检测心肌组织转化生长因子β_(1)(transforming growth factor-β_(1),TGF-β_(1))、Smad2、磷酸化Smad2、Smad3、磷酸化Smad3、Smad7、Ⅰ型胶原蛋白(Collagen-Ⅰ)、Ⅲ型胶原蛋白(Collagen-Ⅲ)表达;双荧光素酶实验验证miR-195-5p对Smad7的调控作用。结果与对照组比较,AF组AF发生率(75.0%vs 0)和持续时间[(27.02±2.65)s vs 0s]、胶原容积分数[(14.47±0.89)%vs(2.12±0.35)%]、心肌组织miR-195-5p(3.27±0.21 vs 1.00±0.10)、TGF-β_(1)(0.76±0.08 vs 0.23±0.04)、Collagen-Ⅰ(0.58±0.07 vs 0.20±0.04)、Collagen-Ⅲ(0.46±0.05 vs 0.11±0.02)、磷酸化Smad2/Smad2(0.92±0.10 vs 0.37±0.05)、磷酸化Smad3/Smad3(0.65±0.06 vs 0.14±0.03)表达明显升高,Smad7mRNA(0.32±0.06 vs 1.02±0.09)和Smad7(0.19±0.03 vs 0.58±0.07)表达明显降低,差异有统计学意义(P<0.05);与AF组和阴性对照组比较,miR-195-5p组AF发生率和持续时间、胶原容积分数、心肌组织miR-195-5p、TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显降低,Smad7mRNA和蛋白表达明显升高,差异有统计学意义(P<0.05);与miR-195-5p组和rAAV9组比较,联合组AF发生率和持续时间、胶原容积分数、心肌组织TGF-β_(1)、Collagen-Ⅰ、Collagen-Ⅲ、磷酸化Smad2/Smad2和磷酸化Smad3/Smad3表达明显升高,Smad7mRNA和Smad7表达明显降低,差异有统计学意义(P<0.05)。结论下调miR-195-5p可能靶向Smad7抑制TGF-β_(1)信号传导,从而减轻AF心肌纤维化。
