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  • 1
    ISSN: 1573-4919
    Keywords: β-alanyl-L-histidinato zinc ; osteocalcin ; insulin-like growth factor-I ; transforming growth factor-β ; osteoblastic cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The effect of β-alanyl-L-histidinato zinc (AHZ) on protein components in osteoblastic MC3T3-E1 cells was investigated. Cells were cultured for 3 days at 37°C in CO2 incubator in plastic dishes containing α-modified minimum essential medium supplemented with 10% fetal bovine serum. After the cultures, the medium was exchanged for that containing 0.1% bovine serum albumin plus various concentrations of AHZ or other reagents, and the cells were cultured further 3 or 6 days. The homgenate of cells was analyzed with SDS-polyacrylamide gel electrophoresis (SDS-PAGE). The presence of AHZ (10−7 to 10−5 M) caused an appreciable increase of many protein components in cells. Especially, the 67 killo-dalton (kDa) and 44 kDa proteins which are the major components from control cells were clearly increased by the presence of AHZ. Furthermore, the concentrations of osteocalcin, insulin-like growth factor-I and transforming growth factor-β in the culture medium secreted from osteoblastic cells were markedly increased by the presence of AHZ (10−6 and 10−5 M). The effect of AHZ was a greater than that of zinc sulfate (10−6 and 10−5 M). The present findings suggest that AHZ can increase many proteins which are involved in the stimulation of bone formation and cell proliferation in osteoblastic cells.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-4919
    Keywords: bone metabolism ; β-alanyl-L-histidinato zinc ; proliferative effect ; protein synthesis ; osteoblastic cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The effect of β-alanyl-L-histidinato zinc (AHZ) on bone metabolism was investigated in osteoblastic MC3T3-El cells. Cells were cultured for 3 days at 37°C in a CO2 incubator in plastic dishes containing α-modified minimum essential medium supplemented with 10% fetal bovine serum. After the cultures, the medium was exchanged for that containing 0.1% bovine serum albumin plus various concentrations of AHZ or other reagents, and the cells were cultured further for appropriate periods of time. The presence of AHZ (10−7–10−5M) stimulated the proliferation of cells. AHZ (10−6 and 10−5M) increased deoxyribonucleic acid (DNA) content in the cells with 48hr-culture. This increase was completely blocked by the presence of cycloheximide (10−6M) or hydroxyurea (10−3M). Also, the presence of cycloheximide (10−6M) completely inhibited the AHZ (10−5M)-induced increase in the proliferation of cells. Meanwhile, parathyroid hormone (10−7M), estrogen (10−9M) and insulin (10−M) significantly increased cellular DNA content. However, these hormonal effects clearly lowered in comparison with that of AHZ (10−5M). Dibutyryl cyclic AMP (10−4M) and zinc sulfate (10−5M) did not cause a significant increase in cellular DNA content. The present results support the view that AHZ has a direct specific proliferative effect on osteoblastic cellsin vitro and that this effect is dependent on protein synthesis.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4919
    Keywords: β-alanyl-L-histidinato zinc ; bone metabolism ; cell differential effect ; protein synthesis ; osteoblastic cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The effect of β-alany-L-histidinato zinc (AHZ) on bone cell function was investigated in osteoblastic MC3T3-E1 cells. Cells were cultured for 3 days at 37°C in a CO2 incubator in plastic dishes containing α-modified minimum essential medium supplemented with 10% fetal bovine serum. After the cultures, the medium was exchanged for that containing 0.1% bovine serum albumin plus AHZ (10−7–10−5 M) or other reagents, and the cells were cultured further for appropriate periods of time. The presence of AHZ (10−7–10−5 M) produced a remarkable increase of alkaline phosphatase activity and protein concentration in osteoblastic cells. Thus increases were seen with the prolonged cultivation (12–21 days). With the culture of 1, 3 and 12 days, the effect of AHZ (10−6 M) to increase alkaline phosphatase activity and protein concentration was more intensive than the effect of zinc sulfate, (10−6 M). The AHZ effects were completely abolished by the presence of cycloheximide (10−6 M), indicating that AHZ stimulates protein synthesis in the cells. The present study suggests that AHZ has a stimulatory effect on cell differentiation, and that this effect is partly involved on protein synthesis in osteoblastic cells.
    Type of Medium: Electronic Resource
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