Ovariectomy worsens visual function after mild optic nerve crush in rodents.

Ovariectomy worsens visual function after mild optic nerve crush in rodents.
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在啮齿动物中轻度视神经挤压后,卵巢切除术会恶化视觉功能。

DOI:
10.1016/j.exer.2020.108333
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发表时间:
2021-01
影响因子:
3.4
通讯作者:
Feola AJ
Feola AJ
中科院分区:
医学3区
文献类型:
--
作者:
Allen RS;Douglass A;Vo H;Feola AJ

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青光眼是全世界不可逆转失明的主要原因,女性约占受影响人口的60%。早期绝经和雌激素信号缺陷是青光眼的危险因素。最近,我们发现手术停经加重了青光眼高眼压模型的视觉功能障碍。在这里,我们研究了手术绝经是否会加重视神经压迫(ONC)直接视网膜神经节细胞(RGC)损伤模型中的视觉功能障碍。雌性Long Evans大鼠(n=12)接受卵巢切除术(OVX)诱导手术绝经或假手术。术后8周,通过视运动反应评估基线视觉功能。之后,对大鼠进行单眼ONC。在onc后4周、8周和12周评估视觉功能。12周时,通过视网膜电图测量视网膜功能,通过光学相干断层扫描测量视网膜神经纤维层(RNFL)厚度。ONC后视力下降(p<0.001),手术绝经动物的视力在12周时比假手术动物低31.7% (p=0.01)。ONC组在12周时RNFL变薄(p<0.0001), RGC功能下降(p=0.0016)。在ONC模型中,手术绝经使RGC直接损伤后的视力恶化。这表明手术绝经在损伤后的视觉功能中起作用。
Glaucoma is the leading cause of irreversible blindness worldwide, and women represent roughly 60% of the affected population. Early menopause and estrogen signaling defects are risk factors for glaucoma. Recently, we found that surgical menopause exacerbated visual dysfunction in an ocular hypertension model of glaucoma. Here, we investigated if surgical menopause exacerbated visual dysfunction in a model of direct retinal ganglion cell (RGC) damage via optic nerve crush (ONC). Female Long Evans rats (n=12) underwent ovariectomy (OVX) to induce surgical menopause or Sham surgery. Eight weeks post-surgery, baseline visual function was assessed via optomotor response. Afterwards, rats underwent monocular ONC. Visual function was assessed at 4, 8, and 12 weeks post-ONC. At 12 weeks, retinal function via electroretinography and retinal nerve fiber layer (RNFL) thickness via optical coherence tomography were measured. Visual acuity was reduced after ONC (p<0.001), with surgical menopausal animals having 31.7% lower visual acuity than Sham animals at 12 weeks (p=0.01). RNFL thinning (p<0.0001) and decreased RGC function (p=0.0016) occurred at 12 weeks in ONC groups. Surgical menopause worsens visual acuity after direct RGC damage using an ONC model. This demonstrates that surgical menopause plays a role in visual function after injury.
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