Effect of nickel on red blood cell parameters and on serum vitamin B12, folate and homocysteine concentrations during pregnancy with and without anemia

BackgroundResearch to date suggests that nickel affects not only the metabolism of vitamin B12 but also folates and thus may affect hematopoiesis processes.ObjectiveThe aim of the study was to examine the relationship of nickel (Ni) status to red blood cell (RBC) parameters and serum vitamin B12, folate and homocysteine concentrations in the course of normal pregnancy and in pregnant women with anemia.MethodsThe study included fifty-three pregnant women recruited to the study from the Lower Silesia region of Poland, 17 % of whom developed anemia. Nickel concentration was determined in urine, whole blood and food samples by atomic absorption spectrometry. At the same time as the food and urine samples were taken, blood was also collected for the determination of RBC parameters and serum vitamin B12, homocysteine and folate concentrations.ResultsThe median reported Ni intake, and the urinary and whole blood nickel contents for the studied pregnant women for the first trimester were respectively – 162.46 μg/day, 3.98 μg/L and 3.32 μg/L; for the second trimester – 110.48 μg/day, 6.86 μg/L and 1.04 μg/L; and for the third trimester – 132.20 μg/day, 3.41 μg/L and 0.70 μg/L. With regard to Ni concentration in whole blood (p = 0.0204) and in urine (p = 0.0003), the differences in the values for individual trimesters were statistically significant. The whole blood Ni level was significantly higher (9.28 vs 3.62 μg/L, p = 0.0114), while the concentration of homosysteine was significantly lower (4.09 vs 5.04 μmol/L, p = 0.0165) in pregnant women with anemia compared to those without anemia. The whole blood Ni concentration was negatively correlated with almost all RBC parameters in non-anemic pregnant women.ConclusionsNi status changes with the development of normal pregnancy, and in the case of anemia, an increase in Ni concentration in whole blood is observed. The demonstrated correlations between the Ni status in pregnant women and RBC parameters as well as serum vitamin B12 and folate concentrations suggest that nickel is associated with the methionine–folate cycle, iron homeostasis and bacterial synthesis of vitamin B12 in humans.     

1-6岁儿童维生素D与年龄、性别、季节及体质量指数的关系研究

目的:探讨1-6岁儿童维生素D与年龄、性别、季节及体质量指数(BMI)的关系,为临床有效指导维生素D的补充提供参考依据。方法:选取2000年1月～2019年1月于我院接受体检的1～6岁儿童816例作为研究对象。采用电化学发光法检测所有研究对象的血清25-羟维生素D[25(OH)D]水平,并分析血清25(OH)D水平与儿童年龄、性别、BMI以及季节的关系。结果:816例儿童维生素D营养不足和缺乏人数占比为14.83%。1～3岁儿童血清25(OH)D水平高于3～6岁儿童(P0.05)。男童血清25(OH)D水平高于女童(P0.05)。肥胖儿童血清25(OH)D水平低于正常与超重儿童,且超重儿童血清25(OH)D水平低于正常儿童(均P0.05)。春、夏季儿童血清25(OH)D水平均高于秋、冬季儿童(均P0.05)。结论:1～6岁儿童的维生素D营养状况不容乐观,随着年龄的增长儿童血清25(OH)D水平显著降低,且男童高于女童,春、夏季高于秋、冬季。临床工作可通过增加其户外活动,继而达到改善维生素D营养状况的目的。     

维生素D水平与牛奶蛋白过敏患儿的相关性研究

摘要 目的：探究维生素D水平与牛奶蛋白过敏（CMPA）患儿的相关性。方法：选取2018年6月~2020年6月就诊于我院的50例CMPA患儿作为观察组,根据其病情严重程度分为轻度组18例、中度组27例和重度组5例,另选取同期于本院进行健康体检的50例健康婴幼儿作为对照组。检测并比较各组血清25-羟基维生素D [25（OH）D]水平,收集婴幼儿的临床资料,采用单因素和多因素 Logistic 回归分析CMPA的相关影响因素。结果：观察组患儿血清25（OH）D水平显著低于对照组,差异具有统计学意义（P<0.05）;重度组和中度组患儿血清25（OH）D水平显著低于轻度组,而重度组又显著低于中度组,差异具有统计学意义（P<0.05）;单因素分析显示,CMPA与血清牛奶蛋白总免疫球蛋白E（IgE）检查结果、血嗜酸性粒细胞检查结果、家族过敏史、维生素D缺乏、喂养方式、生产方式有关（P<0.05）,多因素 Logistic 回归分析显示,血清牛奶蛋白总IgE为阳性、血嗜酸性粒细胞增多、家族过敏史、维生素D缺乏、人工喂养、剖宫产是CMPA的独立影响因素（P<0.05）。结论：CMPA患儿血清25（OH）D水平显著降低,且病情越严重,其水平越低,血清牛奶蛋白总IgE检查结果、血嗜酸性粒细胞检查结果、家族过敏史、维生素D缺乏、喂养方式、生产方式是CMPA的危险因素。     

血清同型半胱氨酸、叶酸、维生素B12水平与冠状动脉病变严重程度的相关性分析

摘要 目的：探讨血清同型半胱氨酸(homocysteine, Hcy)、叶酸、维生素B12水平与冠状动脉病变严重程度的相关性。方法：选取经冠脉造影检查确诊的稳定期冠心病患者220例为研究组,并以同期健康查体志愿者100例为对照组。检测和比较两组血清Hcy、叶酸、维生素B12和N -末端脑钠肽前体(N-terminal brain natriuretic peptide precursor,NT-proBNP)水平。研究组根据冠脉造影情况进行SYNTAX评分评价,通过心脏超声检查检测左室射血分数(left ventricular ejection fraction,LVEF),确定冠脉病变严重程度。比较研究组SYNTAX低分组(1～22分)、中分组(23～32分)和高分组(≥33分)患者上述各指标水平,并分析研究组血清Hcy、叶酸、维生素B12水平与其血清NT-proBNP 水平、SYNTAX评分和LVEF的关系。结果：与对照组比较,研究组血清Hcy和NT-proBNP水平升高而血清叶酸、维生素B12水平降低(P＜0.05)。研究组SYNTAX评分和LVEF分别为(28.76±6.58)分和(47.33±8.66)%,SYNTAX中分和高分患者血清Hcy和NT-proBNP水平高于SYNTAX低分患者而血清叶酸、维生素B12水平和LVEF则低于SYNTAX低分患者,SYNTAX高分患者血清Hcy和NT-proBNP水平高于SYNTAX中分患者而血清叶酸、维生素B12水平和LVEF则低于SYNTAX中分患者(P＜0.05)。Pearson线性相关分析结果显示研究组血清Hcy水平与其血清NT-proBNP 水平、SYNTAX评分均呈正相关(r=0.881,0.793,P＜0.05),与其LVEF则呈负相关(r=-0.876,P＜0.05);而其血清叶酸、维生素B12水平与其血清NT-proBNP 水平、SYNTAX评分均呈负相关(叶酸：r=-0.786,-0.825;维生素B12：r=-0.884,-0.818,P＜0.05),与其LVEF则呈正相关(r=0.893,0.859,P＜0.05)。结论：血清Hcy是冠心病的重要危险因素,其水平随着冠状动脉病变程度加重而升高;血清叶酸、维生素B12是冠心病的保护因素,其水平随着冠状动脉病变程度加重而降低。     

维生素D缺乏与儿童反复呼吸道感染的关系及机制

呼吸道感染是常见的儿科疾病,有着显著的发病率和死亡率,反复呼吸道感染会严重影响儿童的生活质量和身体健康。维生素D具有一系列与人体健康有关的作用,包括与呼吸道的感染有关。为了分析维生素D与儿童反复呼吸道感染的关系,探讨维生素D影响呼吸道感染的机制,本研究通过临床分析了维生素D缺乏与儿童反复呼吸道发生之间的相关性,通过构建炎症模型,观察了外源维生素D对人气道上皮细胞增殖分化的影响,运用ELISA检测了维生素D对人气道上皮细胞和中性粒细胞释放炎症因子(IL-1β,IL-6和TNF-α)的影响。本结果表明,维生素D缺乏与儿童反复呼吸道感染相关,并且维生素D能促进人气道上皮细胞的增殖分化,但对人气道上皮细胞和中性粒细胞炎症因子的产生无显著影响。     

细胞色素P450 3A7羟化维生素D3的功能研究

本研究通过体外生化实验研究细胞色素P450 3A7对维生素D3的羟化作用。根据GenBank报道的序列设计特异引物,扩增cyp3a7的编码区,将cyp3a7的编码区插入到pcDNATM3.1/myc-His(-) A的XhoⅠ/Bam HⅠ,通过测序检测序列的正确性。pcDNA-CYP3A7及pcDNA分别瞬时转染293T细胞,48 h后收集细胞,提取S9组分,用Bradford法测定蛋白质浓度。S9组分经12%SDS-PAGE凝胶电泳和Western blotting检测,用myc抗体作为一抗检测CYP3A7在293T细胞的表达水平。0.6 mg S9组分与1μmol/L维生素D3于37℃孵育30 min,用4倍体积的氯仿甲醇(体积比为3∶1)抽提,有机相在氮气流下吹干,残基用于HPLC分析。结果显示,重组表达CYP3A7的293T细胞的S9组分通过Western blotting检测到了特异的约60 kD的条带,对照样品未检测到特异条带的蛋白质。重组表达CYP3A7的293T细胞S9组分的孵育样品通过HPLC检测到了25-羟基维生素D3,对照样品未检测到25-羟基维生素D3。结果表明重组表达的CYP3A7羟化维生素D3生成25-羟基维生素D3。本研究为进一步探究还有哪些P450参与维生素D3在鸡体内的代谢,为阐明其代谢途径提供理论依据。     

Vitamin D level and its relation to muscle and fat mass in adult male Arabs

Low levels of vitamin D have been linked with increased adiposity and diminished muscle strength. Whether it is also related to fat deposition in muscle tissues is not studied well. This study explored the associations between circulating 25-hydroxyvitamin D (25(OH)D) and fat deposition in muscle tissues of adult Arab males. A total 465 adult Saudi males were included in this cross-sectional study. Anthropometrics, body composition and muscle strength were assessed. Serum 25(OH)D was determined and quantified enzymatically. They were grouped according to vitamin D status: deficient (25(OH)D < 50 nmol/l) N = 325 (69.9%) and sufficient (25(OH)D > 50 nmol/l)140 (30.1%). Mean level of lean/height², lean-arm-legs and lean-arms-legs/height² were significantly higher in 25(OH)D deficient participants (p-values 0.03; 0.05 and 0.01 respectively). Thigh strength was significantly higher in 25(OH)D sufficient participants than their deficient counterparts (p = 0.02). In all participants, a significant correlation between 25(OH)D was observed with age and thigh-strength (p-values < 0.05), while a significant inverse correlation between 25(OH)D and lean/height², lean-arms-legs, lean-arms-legs/height², fat (%) region, fat arms, fat legs, fat trunk, lean legs were noted. In conclusion, low circulating 25(OH)D is associated with enhanced fat infiltration in muscle tissues of adult Arab males.     

维生素A、E水平与儿童反复呼吸道感染的相关性和危险因素研究

摘要 目的：研究维生素A（VA）、维生素E（VE）水平与儿童反复呼吸道感染（RRI）的相关性和危险因素。方法：选择本院2017年1月~2019年10月诊治的318例RRI患儿,同期选择285例健康体检儿童作为对照组,比较各组VA、VE表达情况,并分析儿童RRI发生的危险因素。结果：RRI组VA及VE水平低于对照组,VA及VE缺乏率高于对照组,差异有统计学意义（P<0.05）。1~3岁患儿VA及VE水平高于3~6岁组且高于>6岁组（P<0.05）。对照组和RRI组性别、出生时体重比较无统计学差异（P>0.05）;RRI组自然分娩、母乳喂养率低于对照组,偏食、过敏体质、抗生素滥用、人均居住面积<13 m²、母亲文化高中及以下率高于对照组（P<0.05）。多因素Logistic回归分析显示,早产、偏食、过敏体质、被动吸烟、抗生素滥用、人均居住面积<13 m²是RRI发生的独立危险因素,VA、VE、自然分娩、母乳喂养、母亲文化程度是RRI发生的保护因素。结论：RRI儿童VA、VE水平较低,且RRI的发生和多种危险因素相关,临床应针对性的进行预防干预。     

Immunolocalization of androgen and vitamin D receptors in the epididymis of mature ram (Ovis aries)

This study illustrated the immunohistochemical distribution of androgen and vitamin D receptors of epididymis in 20 sexually mature ram (Rahmani breed) with average age ranged from (2^_4) years and average weight ranged from (50^_65kg). Androgen receptor was localized in the cytoplasm of both ciliated and non ciliated cells of efferent ductules, besides the principal cells via the entire epididymal duct. The principal cells of both corpus and proximal cauda epididymis showed the highest immunoreactivity to androgen receptors. Furthermore, vitamin D receptor was localized in the cytoplasm of all epithelium of the efferent ductules besides principal cells of all epididymal regions, however the immunoreaction was significantly higher in the efferent ductules, distal caput and distal cauda epididymis. In conclusion, these results suggest that the function of ram epididymis is regulated by both androgen and Vitamin D.