Natural nano-hydroxyapatite(HA)was extracted from Pacific cod(Gadus macrocephalus)bone with a thermostable col-lagenolytic protease in the present study.Conditions for the enzymatic reaction were optimized to be 60℃a...Natural nano-hydroxyapatite(HA)was extracted from Pacific cod(Gadus macrocephalus)bone with a thermostable col-lagenolytic protease in the present study.Conditions for the enzymatic reaction were optimized to be 60℃and pH 7.0,and a desir-able extraction efficiency was achieved by using the crude collagenolytic protease.Dynamic light scattering,transmission electron microscopy and energy-dispersive X-ray analysis revealed that nano-HA are anionic spherical(about 110nm)particles mainly com-prised of calcium and phosphorus at an approximate ratio of 5:3.As evaluated with the mouse ex vivo intestinal segments,the extracted nano-HA displayed comparable level of intestinal bioavailability to the positive control CaCl_(2).By treating with inhibitors(NaN3,ami-loride)and low temperature(4℃),clathrin-mediated endocytosis was assumed to involve the intestinal absorption of nano-HA.Over-all,the application of thermostable collagenolytic protease is proved to be a promising alternative method for nano-HA extraction from natural resource with improved ecological and biological value.展开更多
Osteoporosis is a common clinical complication of post-menopausal women and the elderly and can significantly complicate the severity of bone fragility. The purpose of this study is to investigate how cod bone gelatin...Osteoporosis is a common clinical complication of post-menopausal women and the elderly and can significantly complicate the severity of bone fragility. The purpose of this study is to investigate how cod bone gelatin administration influences trabecular biomechanical properties after ovariectomy. Both biomechanical properties and trabecular microarchitectures were evaluated for cancellous bone samples from female ovariectomized rats, which were either shamoperated or treated with marine peptide （0.75, 1.5, 3.0, 6.0 g/kg body weight） for 90 days. The results have confirmed that cod bone gelatin treatment is effective in the prevention of mechanical property loss by preserving bone mass and trabecular architecture.展开更多
以水产加工下脚料鳕鱼骨为原料,对其进行基本组成分析与组织结构观察。从鳕鱼骨中提取胶原蛋白并酶解制得不同分子量段的胶原肽。探讨不同分子量胶原肽组分对MG-63细胞碱性磷酸酶(ALP)活性及相关因子骨形态发生蛋白(BMP-2)、骨保护素(O...以水产加工下脚料鳕鱼骨为原料,对其进行基本组成分析与组织结构观察。从鳕鱼骨中提取胶原蛋白并酶解制得不同分子量段的胶原肽。探讨不同分子量胶原肽组分对MG-63细胞碱性磷酸酶(ALP)活性及相关因子骨形态发生蛋白(BMP-2)、骨保护素(OPG)与核因子-κB受体活化因子配基(RANKL)m RNA表达水平的影响。结果表明:鳕鱼骨中蛋白质含量较高(14.5%),Van Gieson染色发现鳕鱼骨中含有大量的胶原蛋白纤维。鳕鱼骨胶原肽能够提高细胞ALP活性,同时显著上调细胞BMP-2 m RNA的表达水平;鳕鱼骨胶原肽可有效提高细胞OPG/RANKL m RNA的相对表达量,以间接对破骨细胞的成熟及活化进行调控。鳕鱼骨可作为一种优良的天然蛋白源,鳕鱼骨胶原肽能够作为一种有效的抗骨质疏松营养强化剂加以开发。展开更多
基金supported by the Natural Science Foundation of Shandong Province(No.ZR202102270334)the National Key Research and Development Program of China(No.2020YFD0901004).
文摘Natural nano-hydroxyapatite(HA)was extracted from Pacific cod(Gadus macrocephalus)bone with a thermostable col-lagenolytic protease in the present study.Conditions for the enzymatic reaction were optimized to be 60℃and pH 7.0,and a desir-able extraction efficiency was achieved by using the crude collagenolytic protease.Dynamic light scattering,transmission electron microscopy and energy-dispersive X-ray analysis revealed that nano-HA are anionic spherical(about 110nm)particles mainly com-prised of calcium and phosphorus at an approximate ratio of 5:3.As evaluated with the mouse ex vivo intestinal segments,the extracted nano-HA displayed comparable level of intestinal bioavailability to the positive control CaCl_(2).By treating with inhibitors(NaN3,ami-loride)and low temperature(4℃),clathrin-mediated endocytosis was assumed to involve the intestinal absorption of nano-HA.Over-all,the application of thermostable collagenolytic protease is proved to be a promising alternative method for nano-HA extraction from natural resource with improved ecological and biological value.
基金Project supported by the National Natural Science Foundation of China(Nos.10872007 and 81102114)
文摘Osteoporosis is a common clinical complication of post-menopausal women and the elderly and can significantly complicate the severity of bone fragility. The purpose of this study is to investigate how cod bone gelatin administration influences trabecular biomechanical properties after ovariectomy. Both biomechanical properties and trabecular microarchitectures were evaluated for cancellous bone samples from female ovariectomized rats, which were either shamoperated or treated with marine peptide （0.75, 1.5, 3.0, 6.0 g/kg body weight） for 90 days. The results have confirmed that cod bone gelatin treatment is effective in the prevention of mechanical property loss by preserving bone mass and trabecular architecture.
文摘以水产加工下脚料鳕鱼骨为原料,对其进行基本组成分析与组织结构观察。从鳕鱼骨中提取胶原蛋白并酶解制得不同分子量段的胶原肽。探讨不同分子量胶原肽组分对MG-63细胞碱性磷酸酶(ALP)活性及相关因子骨形态发生蛋白(BMP-2)、骨保护素(OPG)与核因子-κB受体活化因子配基(RANKL)m RNA表达水平的影响。结果表明:鳕鱼骨中蛋白质含量较高(14.5%),Van Gieson染色发现鳕鱼骨中含有大量的胶原蛋白纤维。鳕鱼骨胶原肽能够提高细胞ALP活性,同时显著上调细胞BMP-2 m RNA的表达水平;鳕鱼骨胶原肽可有效提高细胞OPG/RANKL m RNA的相对表达量,以间接对破骨细胞的成熟及活化进行调控。鳕鱼骨可作为一种优良的天然蛋白源,鳕鱼骨胶原肽能够作为一种有效的抗骨质疏松营养强化剂加以开发。
