Early and selective subcortical Tau pathology within the human Papez circuit
Early and selective subcortical Tau pathology within the human Papez circuit
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人类 Papez 环路内的早期和选择性皮质下 Tau 蛋白病理学
DOI:
10.1101/2023.06.05.543738
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Sárkány B
中科院分区:
文献类型:
--
作者:
Sárkány B
A major function of Tau is to mediate the assembly of microtubules. The accumulation and apparent ‘prion-like’spread of pathological forms of Tau (pTau) are associated with a wide range of neurodegenerative diseases including Alzheimer’s disease (1-3). The cellular and neurochemical routes of pTau spread in the human brain remains uncertain and animal models cannot exactly recapitulate it.Early impairments in spatial navigation and episodic memory are associated with pathology in the entorhinal cortex (EC) and hippocampus (4, 5). These cortical areas are dependent on subcortical regions of the Papez circuit, which includes the anterior thalamic nuclei and mammillary bodies (6, 7)(Fig. 1A). The anterior thalamic nuclear group, located within the rostral part of the thalamus, comprises anterodorsal (ADn), anteroventral (AV), and anteromedial nuclei, which receive glutamatergic input from different regions of the mammillary bodies (Fig. 1A). Lesions impair spatial memory in rodents (8-10), and degeneration in humans causes memory deficits (11). Earlier data have shown cell loss, extracellular amyloid deposits and neurofibrillary tangles in the anterior nuclear complex (3, 12), indicating a potential role for specific rostral thalamic nuclei in driving Alzheimer’s disease-related memory impairments. However, the exact subcellular compartments (such as axons and dendrites) containing pTau have not been determined, with descriptions typically limited to neurofibrillary tangles and neuropil threads. Compared to the vast and layered cerebral cortex, adjacent thalamic nuclei (or even subfields of the same nucleus) exhibit markedly different cortical and subcortical connectivity (13-16). This provides a unique opportunity for understanding the spread of pTau and the sites of vulnerability.
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