Serine racemase deletion attenuates neurodegeneration and microvascular damage in diabetic retinopathy.

Serine racemase deletion attenuates neurodegeneration and microvascular damage in diabetic retinopathy.
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DOI:
10.1371/journal.pone.0190864
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Mori H
Mori H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ozaki H;Inoue R;Matsushima T;Sasahara M;Hayashi A;Mori H

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糖尿病视网膜病变(DR)是导致失明的主要原因。 DR被认为是一种微血管疾病和视网膜内神经变性。在视网膜神经变性的过程中,涉及N-甲基-D-天冬氨酸受体(NMDAR)介导的兴奋性毒性。 NMDAR 的完全激活需要激动剂谷氨酸和共激动剂甘氨酸或 D-丝氨酸的结合。 D-丝氨酸是由丝氨酸消旋酶 (SRR) 从 L-丝氨酸产生的,在 DR 啮齿动物模型中会导致视网膜神经变性。然而,SRR 在 DR 的神经退行性变和微血管损伤中的作用仍不清楚。在这里,我们建立了SRR敲除(SRR-KO)糖尿病模型并通过注射链脲佐菌素对照野生型(WT)小鼠。糖尿病发病六个月后,SRR-KO 小鼠存活的视网膜神经节细胞数量高于 WT 小鼠。 SRR-KO小鼠视网膜内层(IRL)厚度的减少比WT小鼠减弱。此外,SRR-KO 小鼠中受损的脱细胞毛细血管数量低于 WT 小鼠。我们的结果表明抑制 SRR 活性可能对 DR 具有保护作用。
Diabetic retinopathy (DR) is a leading cause of blindness. DR is recognized as a microvascular disease and inner retinal neurodegeneration. In the course of retinal neurodegeneration, N-methyl-D-aspartate receptor (NMDAR)-mediated excitotoxicity is involved. Full activation of NMDAR requires binding of agonist glutamate and coagonist glycine or D-serine. D-Serine is produced from L-serine by serine racemase (SRR) and contributes to retinal neurodegeneration in rodent models of DR. However, the involvement of SRR in both neurodegeneration and microvascular damage in DR remains unclear. Here, we established diabetic model of SRR knockout (SRR-KO) and control wild-type (WT) mice by streptozotocin injection. Six months after the onset of diabetes, the number of survived retinal ganglion cells was higher in SRR-KO mice than that of WT mice. The reduction of thickness of inner retinal layer (IRL) was attenuated in SRR-KO mice than that of WT mice. Moreover, the number of damaged acellular capillaries was lower in SRR-KO mice than that of WT mice. Our results suggest the suppression of SRR activity may have protective effects in DR.
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