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Vit D Crucial to Immune System & inverse relation to ALT? [复制链接]

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发表于 2011-12-30 21:44 |只看该作者 |倒序浏览 |打印
本帖最后由 StephenW 于 2012-1-1 06:37 编辑

http://ivanhoe.com/channels/p_channelstory.cfm?storyid=23742
Vitamin D Crucial to Immune System
(Ivanhoe Newswire) -- It's been known vitamin D plays a crucial role in our immune system, but new research reveals why lacking the nutrient prevents the body's soldiers -- T cells -- from fighting off serious infections.
T cells are dormant immune cells until they are activated to detect and kill bacteria and viruses. A new study shows without vitamin D in the blood, activation would not take place.
According to Professor Carsten Geisler, of the Department of International Health, Immunology and Microbiology at the University of Copenhagen in Denmark, when T cells are exposed to foreign pathogens, they expose a vitamin D receptor that searches for vitamin D. If the cells do not receive the nutrient, the cells will not activate.

"Scientists have known for a long time that vitamin D is important for calcium absorption and the vitamin has also been implicated in diseases such as cancer and multiple sclerosis, but what we didn't realize is how crucial vitamin D is for actually activating the immune system, which we know now," Geisler was quoted as saying.

Researchers say the findings could help tackle infectious diseases or epidemics whose effect is widespread. "They will be of particular use when developing new vaccines, which work precisely on the basis of both training our immune systems to react and suppressing the body's natural defenses in situations where this is important -- as is the case with organ transplants and autoimmune disease," Geisler stated.
Source: Nature Immunology, March 2010

维生素D对免疫系统至关重要

(艾芬豪通社) - 这是被称为维生素D扮演了至关重要的作用,在我们的免疫系统,但新的研究揭示为什么缺乏营养,防止身体的士兵 - 从战斗过严重的感染 - T细胞。

T细胞是处于休眠状态,直到它们被激活检测和杀灭细菌和病毒的免疫细胞。没有维生素D在血液中的一项新研究显示,激活将不会发生。

据卡斯滕盖斯勒,在丹麦哥本哈根大学国际卫生,免疫学和微生物学系教授,当T细胞暴露于外来病原,他们暴露了维生素D受体,维生素D的搜索,如果细胞不接收的营养,细胞不会激活。

“科学家们已经知道了很长时间,维生素D对钙的吸收和疾病,如癌症和多发性硬化症的维生素也被牵连,但我们并没有意识到的是多么重要的维生素D是实际激活免疫很重要系统,我们现在知道,“盖斯勒被引述说。

研究人员说,这些发现可以帮助解决,其效果非常普遍的传染病或流行病。 “他们将特定用途,开发新的疫苗,这正是两个培训的基础上,我们的免疫系统作出反应,并抑制人体的情况下,这是很重要的天然防御系统 - 器官移植和自身免疫性疾病的情况下,“盖斯勒说。

资料来源:自然免疫学杂志,2010年3月
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发表于 2012-1-1 06:35 |只看该作者
2011
Serum Vitamin D Concentrations and Unexplained Elevation in ALT Among US Adults.
Dig Dis Sci. 2011 Apr 19.
Liangpunsakul S, Chalasani N.

Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, 550 N. University Blvd, UH 4100, Indianapolis, IN, 46202-5124, USA, ***@****.
  
BACKGROUND:
Low serum levels of vitamin D are associated with metabolic syndrome. Participants in NHANES III with unexplained elevation in ALT levels have high prevalence of metabolic syndrome. We hypothesized that the serum concentrations of vitamin D were inversely associated with unexplained elevation in ALT.

METHODS:
A total of 6,826 fasting subjects underwent morning physical examination and met the inclusion and exclusion criteria.
From these participants, we have constructed cases with unexplained elevation in ALT (n = 308) and compared their serum vitamin D concentrations to matched controls with normal ALT (N = 979).
We examined the prevalence of unexplained elevation in ALT level across different quartiles of vitamin D levels.

RESULTS:
Participants with unexplained elevation in ALT had significantly lower serum vitamin D levels compared to controls (61.8 ± 26.0 nmol/l vs. 66.8 ± 27.1 nmol/l, P < 0.01). The unadjusted prevalence of unexplained elevation in ALT in patients with highest to lowest quartiles of serum vitamin D levels were 21.4, 21.4, 25.6, and 31.5%, respectively. Compared to lowest quartile, patients with top two quartiles of serum vitamin D levels had significantly lower prevalence of unexplained elevation in ALT (OR, 95% CI for highest quartile 0.62 [0.43-0.89] and for third quartile 0.61 [0.42-0.86]). This relationship persisted even after controlling for metabolic syndrome, insulin resistance, and serum triglycerides.

CONCLUSIONS:
This study suggests a significant inverse relationship between serum vitamin D levels and unexplained elevation in ALT.
Further studies are needed to confirm this observation and to understand the basis for and implications of this observation.
2011
血清维生素D的浓度和在美国成年人在ALT出现原因不明的高程。
挖掘DIS科学。 2011年4月19日。
Liangpunsakul S,Chalasani N。

胃肠病学和肝病科,美国印第安纳大学医学院医学系,印第安纳大学大道550北路,4100架UH,中,46202-5124,美国,***@****.
  
背景:
低血清维生素D水平与代谢综合征。 NHANES III的参与者与不明原因ALT水平升高代谢综合征的患病率很高。我们推测不明原因的ALT升高,血清中维生素D的浓度成反比。

方法:
共有6826空腹科目经历了上午的体检,并符合纳入和排除标准。
从这些参与者中,我们已经建造例ALT不明原因的海拔(N = 308)相比,其血清中维生素D浓度与ALT正常(N = 979)相匹配的对照。
我们曾在ALT水平跨越不同的维生素D水平的四分位的患病原因不明的海拔。

结果:
不明原因的ALT升高的参加者有显着降低血清维生素D水平与对照组相比(61.8 ± 26.0 nmol / L的与66.8 ± 27.1 nmol / L的,P <0.01)。不明原因的ALT升高的患者血清维生素D水平最低的四分位数最高的未经调整的患病率分别为21.4,21.4,25.6和31.5%,分别。最低四分位数相比,前两个血清维生素D水平的25%的患者有不明原因的海拔在ALT显着降低患病率(OR,95%CI为最高四分位数0.62 [0.43-0.89]和第三四分位数0.61 [0.42-0.86]) 。这种关系,坚持即使在控制代谢综合征,胰岛素抵抗,血清甘油三酯。

结论:
这项研究表明,血清维生素D水平和不明原因的ALT升高之间的一个显着的反比关系。
还需要进一步研究来证实这一点的观察和了解此观察的基础和影响。
2011
血清维生素D的浓度和在美国成年人在ALT出现原因不明的高程。
挖掘DIS科学。 2011年4月19日。
Liangpunsakul S,Chalasani N。

胃肠病学和肝病科,美国印第安纳大学医学院医学系,印第安纳大学大道550北路,4100架UH,中,46202-5124,美国,***@****.
  
背景:
低血清维生素D水平与代谢综合征。 NHANES III的参与者与不明原因ALT水平升高代谢综合征的患病率很高。我们推测不明原因的ALT升高,血清中维生素D的浓度成反比。

方法:
共有6826空腹科目经历了上午的体检,并符合纳入和排除标准。
从这些参与者中,我们已经构建与不明原因的ALT升高(N = 308)个案,其血清中维生素D的浓度与ALT正常(N = 979)相匹配的对照比较。
我们曾在ALT水平跨越不同的维生素D水平的四分位的患病原因不明的海拔。

结果:
不明原因的ALT升高的参加者有显着降低血清维生素D水平与对照组相比(61.8 ± 26.0 nmol / L的与66.8 ± 27.1 nmol / L的,P <0.01)。不明原因的ALT升高的患者血清维生素D水平最低的四分位数最高的未经调整的患病率分别为21.4,21.4,25.6和31.5%,分别。最低四分位数相比,前两个血清维生素D水平的25%的患者有不明原因的海拔在ALT显着降低患病率(OR,95%CI为最高四分位数0.62 [0.43-0.89]和第三四分位数0.61 [0.42-0.86]) 。这种关系,坚持即使在控制代谢综合征,胰岛素抵抗,血清甘油三酯。

结论:
这项研究表明,血清维生素D水平和不明原因的ALT升高之间的一个显着的反比关系。
还需要进一步研究来证实这一点的观察和了解此观察的基础和影响。
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