Direct retino-raphe projection alters serotonergic tone and affective behavior.

Direct retino-raphe projection alters serotonergic tone and affective behavior.
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直接视网膜中缝投射改变血清素能色调和情感行为

DOI:
10.1038/npp.2013.35
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发表时间:
2013-06
期刊:
Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology
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光是情绪等高阶认知过程的强大调节剂,但目前尚不清楚哪些神经回路介导光对情感行为的影响。我们发现,光照剥夺会产生类似抑郁的行为状态,这种状态可以通过激活直接视网膜信号到血清素能中缝背核(DRN)来逆转,其方式相当于用选择性血清素再摄取抑制剂氟西汀治疗。令人惊讶的是,DRN 投射的视网膜神经节细胞 (RGC) 与经典的 α/Y 样 RGC 类型没有区别,后者有助于形成图像的视觉通路。抑制 RGC 放电或消除 DRN 投射的 RGC 的特异性免疫毒素会增加 DRN 中的抑郁样行为并降低血清素水平。 5-羟色胺在抑郁症的病理生理学中起着关键作用,这些结果表明,中缝视网膜信号调节 DRN 5-羟色胺能基调和情感行为。
Light is a powerful modulator of higher-order cognitive processes such as mood but it remains unclear which neural circuits mediate the impact of light on affective behavior. We found that light deprivation produces a depressive-like behavioral state that is reversed by activation of direct retinal signals to the serotonergic dorsal raphe nucleus (DRN) in a manner equivalent to treatment with the selective serotonin reuptake inhibitor fluoxetine. Surprisingly, the DRN-projecting retinal ganglion cells (RGCs) are indistinguishable from the classic alpha/Y-like RGC type that contributes to image-forming visual pathways. Silencing RGC firing or specific immunotoxin ablation of DRN-projecting RGCs increased depressive-like behavior and reduced serotonin levels in the DRN. Serotonin has a key role in the pathophysiology of depression, and these results demonstrate that retino-raphe signals modulate DRN serotonergic tone and affective behavior.
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