Silicon deprivation and arginine and cystine supplementation affect bone collagen and bone and plasma trace mineral concentrations in rats†‡§

C.D. Seaborn, F.H. Nielsen
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引用次数: 18

Abstract

Because arginine has been established as an essential amino acid for collagen formation, and several bone-remodeling proteins are rich in cysteine, we performed a study to ascertain whether supplemental arginine (Arg) and cystine (Cys) would affect bone collagen and mineral composition changes in animals deprived of silicon (Si). Male weanling Sprague-Dawley rats were randomly assigned to treatment groups of 12 in a 2 × 2 factorially arranged experiment. The rats were fed for 9 weeks a basal casein–ground corn–corn oil diet containing per g 2 μg Si, 1.7 mg Cys, 4.7 mg methionine, and 7.8 mg Arg. The independent treatment variables, per g fresh diet, were supplemental Si (as sodium metasilicate) at 0 and 35 μg and Cys or Arg at 0 and 12 mg. Silicon deprivation decreased the concentration of hydroxyproline in femur and potassium in vertebra. An interaction between Si and amino acid supplementation affected hematocrit, liver iron concentration, and bone copper and manganese concentrations. In animals deprived of Si, Cys supplementation compared to Arg supplementation depressed hematocrit, liver iron concentration, and tibia and vertebral copper concentrations and increased tibia and vertebral manganese concentrations. On the other hand, in animals fed adequate Si, supplemental Cys compared to supplemental Arg increased hematocrit, liver iron concentration, and tibia and vertebral copper concentrations and decreased tibia and vertebral manganese concentrations. Dietary Si also influenced the effect of Cys on mineral composition of the vertebra. The calcium and phosphorus concentrations in the vertebra were markedly increased by supplemental Cys compared to supplemental Arg when dietary Si was inadequate but had no effect on these concentrations when dietary Si was adequate. These findings indicate that silicon is needed for collagen formation, that high dietary Cys enhances changes induced by Si deprivation in trabecular-rich bone, and that Si nutriture has more impact on trabecular-rich bone than in cortical-rich bone. J. Trace Elem. Exp. Med. 15:113–122, 2002. Published 2002 Wiley-Liss, Inc.
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缺硅、补充精氨酸和胱氨酸会影响大鼠的骨胶原蛋白、骨和血浆微量矿物质浓度††§
由于精氨酸已被确定为胶原蛋白形成的必需氨基酸,并且几种骨重塑蛋白富含半胱氨酸,我们进行了一项研究,以确定补充精氨酸(Arg)和胱氨酸(Cys)是否会影响缺硅动物的骨胶原蛋白和矿物质组成变化。在2×2因子安排的实验中,雄性断奶Sprague-Dawley大鼠被随机分配到12个治疗组。大鼠喂食酪蛋白-磨碎的玉米-玉米油基础日粮9周,每克含有2μg Si、1.7 mg Cys、4.7 mg蛋氨酸和7.8 mg Arg。每克新鲜饮食的独立治疗变量是0和35μg的补充Si(偏硅酸钠),0和12 mg的Cys或Arg。缺硅降低了股骨中羟脯氨酸和脊椎中钾的浓度。补充Si和氨基酸之间的相互作用影响红细胞比容、肝铁浓度以及骨铜和锰浓度。在缺乏Si的动物中,与补充Arg相比,补充Cys降低了血细胞比容、肝脏铁浓度、胫骨和脊椎铜浓度,并增加了胫骨和脊椎锰浓度。另一方面,在喂食充足Si的动物中,与补充Arg相比,补充Cys增加了血细胞比容、肝脏铁浓度、胫骨和脊椎铜浓度,并降低了胫骨和脊椎锰浓度。日粮Si也影响Cys对脊椎矿物质组成的影响。当膳食Si不足时,与补充Arg相比,补充Cys显著增加了椎骨中的钙和磷浓度,但当膳食Si充足时,对这些浓度没有影响。这些发现表明,胶原蛋白的形成需要硅,高膳食Cys增强了富含小梁骨中Si剥夺引起的变化,并且Si营养对富含小梁的骨的影响比富含皮质的骨更大。J.Trace Elem。《实验医学》,2002年,15:113–122。出版于2002年,Wiley-Liss,股份有限公司。
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