Li Lanfang, Guo Yiqing, Jing Wei, Tang Xiaomei, Zeng Jinyu, Hou Zhenye, Song Yige, He Aodi, Li Hao, Zhu Ling-Qiang, Lu Youming, Li Xinyan
Wuhan Center of Brain Science, Huazhong University of Science and Technology, Wuhan, 430030, China.
Innovation Center of Brain Medical Sciences, Ministry of Education of the People's Republic of China, Wuhan, 430030, China.
Adv Sci (Weinh). 2025 Apr;12(13):e2409397. doi: 10.1002/advs.202409397. Epub 2025 Feb 10.
Mammillary body (MB) is traditionally viewed as a structural node of an anatomic circuit for emotion and memory. However, little is known about its molecular and cellular organizations. Here, a discovery that MB contains four subtypes of neurons that occupy different spatial subregions is reported. Of these, two subtypes of neurons are tagged by parvalbumin (PV) and dopamine receptor-D2 (Drd2) markers. PV neurons are spontaneously active, whereas Drd2 neurons are inactive at rest and generate rebound bursts. These two distinct electrophysiological properties are encoded by Kcnn4 and Cacna1h. PV and Drd2 neurons generate two distinct cell-type specific circuits by receiving inputs from two discrete subiculum neuronal classes. Gain- and loss-of-function studies on these cortical-subcortical circuits demonstrate their differential roles for place and object recognition memory. This finding provides a comprehensive molecular and structural atlas of MB neurons at single-cell resolution and reveals that MB contains molecularly, structurally, and functionally dissociable streams within its serial architecture.
乳头体(MB)传统上被视为情感和记忆解剖回路的一个结构节点。然而,人们对其分子和细胞组织知之甚少。在此,报告了一项发现,即乳头体包含占据不同空间亚区域的四种神经元亚型。其中,两种神经元亚型由小白蛋白(PV)和多巴胺受体D2(Drd2)标记物标记。PV神经元自发活动,而Drd2神经元在静息时不活动并产生反弹爆发。这两种不同的电生理特性由Kcnn4和Cacna1h编码。PV和Drd2神经元通过接收来自两个离散的海马下托神经元类别的输入,产生两种不同的细胞类型特异性回路。对这些皮质-皮质下回路的功能获得和功能丧失研究表明,它们在位置和物体识别记忆中具有不同的作用。这一发现提供了单细胞分辨率下乳头体神经元的全面分子和结构图谱,并揭示乳头体在其串联结构中包含分子、结构和功能上可分离的信息流。