Vitamin A cycle byproducts impede dark adaptation.

Vitamin A cycle byproducts impede dark adaptation.
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DOI:
10.1016/j.jbc.2021.101074
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发表时间:
2021-09
期刊:
The Journal of biological chemistry
影响因子:
--
通讯作者:
Washington I
Washington I
中科院分区:
其他
文献类型:
--
作者:
Zhang D;Robinson K;Saad L;Washington I

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暗适应受损(DA)是一种适应昏暗环境的能力缺陷,是衰老的普遍标志。然而,人们对DA受损的机制知之甚少。维生素A副产物,如维生素A二聚体,是在维生素A循环过程中在视网膜中形成的小分子。我们表明,在生命的后期,在人眼中,这些副产品达到与维生素A的水平相称的水平。在小鼠中,通过研究药物C20D3-维生素A,选择性地抑制这些副产品的形成,导致更快的DA。相比之下,通过外源性递送急剧增加这些眼部副产品会导致DA减慢,否则会保留视网膜的功能和形态。我们的发现表明,仅维生素A周期副产物就足以导致DA延迟,并表明它们可能导致普遍的与年龄相关的DA损害。我们的数据进一步表明,与年龄相关的DA下降可能归因于C20D3-维生素A的药物干预。
Impaired dark adaptation (DA), a defect in the ability to adjust to dimly lit settings, is a universal hallmark of aging. However, the mechanisms responsible for impaired DA are poorly understood. Vitamin A byproducts, such as vitamin A dimers, are small molecules that form in the retina during the vitamin A cycle. We show that later in life, in the human eye, these byproducts reach levels commensurate with those of vitamin A. In mice, selectively inhibiting the formation of these byproducts, with the investigational drug C20D3-vitamin A, results in faster DA. In contrast, acutely increasing these ocular byproducts through exogenous delivery leads to slower DA, with otherwise preserved retinal function and morphology. Our findings reveal that vitamin A cycle byproducts alone are sufficient to cause delays in DA and suggest that they may contribute to universal age-related DA impairment. Our data further indicate that the age-related decline in DA may be tractable to pharmacological intervention by C20D3-vitamin A.
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