A large body of literature suggests that bone metabolism is susceptible to the ill effects of reactive species that accumulate in the body and cause cellular dysfunction. One of the body＇s front lines in defense agai...A large body of literature suggests that bone metabolism is susceptible to the ill effects of reactive species that accumulate in the body and cause cellular dysfunction. One of the body＇s front lines in defense against such damage is the transcription factor, Nrf2. This transcription factor regulates a plethora of antioxidant and cellular defense pathways to protect cells from such damage. Despite the breadth of knowledge of both the function of Nrf2 and the effects of reactive species in bone metabolism, the direct role of Nrf2 in skeletal biology has yet to be thoroughly examined. Thus, in the current study, we have examined the role of Nrf2 in postnatal bone metabolism in mice. Mice lacking Nrf2 （Nrf2-/-） exhibited a marked deficit in postnatal bone acquisition, which was most severe at 3 weeks of age when osteoblast numbers were 12-fold less than observed in control animals. While primary osteoblasts from Nrf2-/- mice functioned normally in vitro, the colony forming capacity of bone marrow stromal cells （BMSCs） from these mice was significantly reduced compared to controls. This defect could be rescued through treatment with the radical scavenger N-acetyl cysteine （NAC）, suggesting that increased reactive species stress might impair early osteoblastogenesis in BMSCs and lead to the failure of bone acquisition observed in Nrf2-/- animals. Taken together, these studies suggest Nrf2 represents a key pathway in regulating bone metabolism, which may provide future therapeutic targets to treat osteoporosis.展开更多
In regenerating liver of mice, marked increase of the activity of phosphotyrosyl protein phosphatase (PTPP) in cytosol was observed. The PTPP activity varied with time and reached the highest level between 24 to 48 ho...In regenerating liver of mice, marked increase of the activity of phosphotyrosyl protein phosphatase (PTPP) in cytosol was observed. The PTPP activity varied with time and reached the highest level between 24 to 48 hours after partial hepatectomy. In H22a cells the PTPP activity found in every subcellular fraction was lower than that of the normal liver. The PTPP activity was mostly concentrated in lysosomes of normal liver, but mainly distributed in nucleus, cytosol and microsome of regenerating liver. In H22a cells PTPP activity seemed distribute evenly. Five similar major PTPP peaks (I-V) were obtained on DEAE cellulose chromatography of cytosols from all three of liver cells studied. However, two additional PTPP peaks, a and b, were also obtained from cytosol of liver.展开更多
The Radix Isatidis polysaccharides (IIP) injected ip at the dose of 50mg/kg daily for seven days increased the spleen index. the total numbero of leukocytes and lymphocytes,the percentage of ANAE+ lymphocytes and the ...The Radix Isatidis polysaccharides (IIP) injected ip at the dose of 50mg/kg daily for seven days increased the spleen index. the total numbero of leukocytes and lymphocytes,the percentage of ANAE+ lymphocytes and the intensity of delayed type hyperoensitivity in normal mice as well as in immunosuppressed mice.Moreover,IIP could improve the phagocytic function of reticuloendothelial system,promote the yield of hemolysin,and increase the NK activity in norwal mice at the same dose.展开更多
目的探讨解毒祛瘀滋肾方中3味解毒中药单用或不同组合对MRL/lpr小鼠血清及肾组织调节正常T细胞表达和分泌活性因子(regulated on activation normal T cell expressed and secreated,RANTES)表达的影响。方法 54只MRL/lpr小鼠随机分成9...目的探讨解毒祛瘀滋肾方中3味解毒中药单用或不同组合对MRL/lpr小鼠血清及肾组织调节正常T细胞表达和分泌活性因子(regulated on activation normal T cell expressed and secreated,RANTES)表达的影响。方法 54只MRL/lpr小鼠随机分成9组,每组6只,分别以青蒿、蛇舌草、升麻、青蒿蛇舌草、青蒿升麻、蛇舌草升麻、青蒿蛇舌草升麻煎剂、泼尼松混悬液、生理盐水灌胃,12周后取血及肾脏,以ELISA法及RT-PCR法分别检测血清和肾组织中RANTES的表达。结果治疗12周末,泼尼松组的RANTES表达水平均显著下降;青蒿、升麻对RANTES表达水平的抑制作用不明显,蛇舌草、青蒿联合蛇舌草、青蒿联合升麻、蛇舌草联合升麻虽均有一定的抑制作用,但均不如青蒿联合蛇舌草及升麻的抑制作用明显。结论青蒿、蛇舌草、升麻三药联用能抑制RANTES的表达。展开更多
基金supported by a Johns Hopkins Musculoskeletal Research Pilot and Feasibility Grant (RKT) and NIH R01 AR062074 (DJD)
文摘A large body of literature suggests that bone metabolism is susceptible to the ill effects of reactive species that accumulate in the body and cause cellular dysfunction. One of the body＇s front lines in defense against such damage is the transcription factor, Nrf2. This transcription factor regulates a plethora of antioxidant and cellular defense pathways to protect cells from such damage. Despite the breadth of knowledge of both the function of Nrf2 and the effects of reactive species in bone metabolism, the direct role of Nrf2 in skeletal biology has yet to be thoroughly examined. Thus, in the current study, we have examined the role of Nrf2 in postnatal bone metabolism in mice. Mice lacking Nrf2 （Nrf2-/-） exhibited a marked deficit in postnatal bone acquisition, which was most severe at 3 weeks of age when osteoblast numbers were 12-fold less than observed in control animals. While primary osteoblasts from Nrf2-/- mice functioned normally in vitro, the colony forming capacity of bone marrow stromal cells （BMSCs） from these mice was significantly reduced compared to controls. This defect could be rescued through treatment with the radical scavenger N-acetyl cysteine （NAC）, suggesting that increased reactive species stress might impair early osteoblastogenesis in BMSCs and lead to the failure of bone acquisition observed in Nrf2-/- animals. Taken together, these studies suggest Nrf2 represents a key pathway in regulating bone metabolism, which may provide future therapeutic targets to treat osteoporosis.
文摘In regenerating liver of mice, marked increase of the activity of phosphotyrosyl protein phosphatase (PTPP) in cytosol was observed. The PTPP activity varied with time and reached the highest level between 24 to 48 hours after partial hepatectomy. In H22a cells the PTPP activity found in every subcellular fraction was lower than that of the normal liver. The PTPP activity was mostly concentrated in lysosomes of normal liver, but mainly distributed in nucleus, cytosol and microsome of regenerating liver. In H22a cells PTPP activity seemed distribute evenly. Five similar major PTPP peaks (I-V) were obtained on DEAE cellulose chromatography of cytosols from all three of liver cells studied. However, two additional PTPP peaks, a and b, were also obtained from cytosol of liver.
文摘The Radix Isatidis polysaccharides (IIP) injected ip at the dose of 50mg/kg daily for seven days increased the spleen index. the total numbero of leukocytes and lymphocytes,the percentage of ANAE+ lymphocytes and the intensity of delayed type hyperoensitivity in normal mice as well as in immunosuppressed mice.Moreover,IIP could improve the phagocytic function of reticuloendothelial system,promote the yield of hemolysin,and increase the NK activity in norwal mice at the same dose.
文摘目的探讨解毒祛瘀滋肾方中3味解毒中药单用或不同组合对MRL/lpr小鼠血清及肾组织调节正常T细胞表达和分泌活性因子(regulated on activation normal T cell expressed and secreated,RANTES)表达的影响。方法 54只MRL/lpr小鼠随机分成9组,每组6只,分别以青蒿、蛇舌草、升麻、青蒿蛇舌草、青蒿升麻、蛇舌草升麻、青蒿蛇舌草升麻煎剂、泼尼松混悬液、生理盐水灌胃,12周后取血及肾脏,以ELISA法及RT-PCR法分别检测血清和肾组织中RANTES的表达。结果治疗12周末,泼尼松组的RANTES表达水平均显著下降;青蒿、升麻对RANTES表达水平的抑制作用不明显,蛇舌草、青蒿联合蛇舌草、青蒿联合升麻、蛇舌草联合升麻虽均有一定的抑制作用,但均不如青蒿联合蛇舌草及升麻的抑制作用明显。结论青蒿、蛇舌草、升麻三药联用能抑制RANTES的表达。
