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1. Extracellular Tau Oligomers Damage the Axon Initial Segment by an Endogenous Tau‐Dependent Mechanism

   https://doi.org/10.1002/alz.078491  

   Best, Merci N; Lim, Yunu; Ferenc, Nina; Kim, Nayoung; Wang, Dora Bigler; Sharifi, Kamyar; Wasserman, Anna; McTavish, Sloane; Siller, Karsten; Jones, Marieke K; et al (December 2023, Alzheimer's & Dementia)

   Abstract BackgroundNeuronal polarity and synaptic connectivity are compromised in Alzheimer’s disease (AD) and other tauopathies. The axon initial segment (AIS) is a key structure for regulating polarity and functions of neurons. It occupies the first 20‐60 µm of the axon, comprises a diffusion barrier that segregates axon‐enriched from somatodendritic‐enriched molecules, and has a high concentration of voltage‐gated ion channels that generate action potentials. Extracellular amyloid‐β oligomers compromise AIS integrity. However, effects on the AIS of toxic tau species, including extracellular oligomers (xcTauOs) that spread tau pathology from neuron to neuron by a prion‐like process, whereas unknown. Therefore, we wanted to test the hypothesis that AIS structure is sensitive to xcTauOs. MethodPrimary cortical neurons derived from either wild type (WT), or tau knockout (KO) mice were exposed to xcTauOs or vehicle. Quantitative western blotting and immunofluorescence microscopy with an antibody against the AIS‐enriched protein TRIM46 was used to monitor effects on the AIS. The same methods were also used to compare TRIM46 and two other AIS proteins, ankyrin‐G and neurofascin‐186 in human hippocampal tissue obtained from AD and age‐matched non‐AD donors. ResultIn cultured WT, but not TKO neurons, xcTauOs cause a trend toward AIS shortening and reduce the concentration of the resident AIS protein, TRIM46, without affecting total TRIM46 levels. Lentiviral‐driven human tau expression in tau KO neurons rescues TRIM46 sensitivity to xcTauOs. In human AD hippocampus, AIS length and TRIM46 concentration within the AIS are reduced in neurons containing neurofibrillary tangles (NFTs), without affecting the overall protein levels of multiple resident AIS proteins. ConclusionThese collective findings demonstrate that in cultured neurons, xcTauOs cause partial AIS damage by a mechanism dependent on intracellular tau, thereby raising the possibility that AIS reduction in AD is caused by xcTauOs working in concert with endogenous neuronal tau. 

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2. The Amyloid Precursor Protein Modulates the Position and Length of the Axon Initial Segment

   https://doi.org/10.1523/jneurosci.0172-22.2023  

   Ma, Fulin; Akolkar, Himanshu; Xu, Jianquan; Liu, Yang; Popova, Dina; Xie, Jiaan; Youssef, Mark M.; Benosman, Ryad; Hart, Ronald P.; Herrup, Karl (March 2023, The Journal of Neuroscience)

   The amyloid precursor protein (APP) is linked to the genetics and pathogenesis of Alzheimer's disease (AD). It is the parent protein of the β-amyloid (Aβ) peptide, the main constituent of the amyloid plaques found in an AD brain. The pathways from APP to Aβ are intensively studied, yet the normal functions of APP itself have generated less interest. We report here that glutamate stimulation of neuronal activity leads to a rapid increase inAppgene expression. In mouse and human neurons, elevated APP protein changes the structure of the axon initial segment (AIS) where action potentials are initiated. The AIS is shortened in length and shifts away from the cell body. The GCaMP8f Ca²⁺reporter confirms the predicted decrease in neuronal activity. NMDA antagonists or knockdown ofAppblock the glutamate effects. The actions of APP on the AIS are cell-autonomous; exogenous Aβ, either fibrillar or oligomeric, has no effect. In culture, APP_Swe(a familial AD mutation) induces larger AIS changes than wild type APP. Ankyrin G and βIV-spectrin, scaffolding proteins of the AIS, both physically associate with APP, more so in AD brains. Finally, in humans with sporadic AD or in the R1.40 AD mouse model, both females and males, neurons have elevated levels of APP protein that invade the AIS.In vivoasin vitro, this increased APP is associated with a significant shortening of the AIS. The findings outline a new role for the APP and encourage a reconsideration of its relationship to AD. SIGNIFICANCE STATEMENTWhile the amyloid precursor protein (APP) has long been associated with Alzheimer's disease (AD), the normal functions of the full-length Type I membrane protein have been largely unexplored. We report here that the levels of APP protein increase with neuronal activity.In vivoandin vitro, modest amounts of excess APP alter the properties of the axon initial segment. The β-amyloid peptide derived from APP is without effect. Consistent with the observed changes in the axon initial segment which would be expected to decrease action potential firing, we show that APP expression depresses neuronal activity. In mouse AD models and human sporadic AD, APP physically associates with the scaffolding proteins of the axon initial segment, suggesting a relationship with AD dementia. 

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3. Tau regulates Arc stability in neuronal dendrites via a proteasome-sensitive but ubiquitin-independent pathway

   https://doi.org/10.1016/j.jbc.2024.107237  

   Yakout, Dina W; Shroff, Ankit; Wei, Wei; Thaker, Vishrut; Allen, Zachary D; Sajish, Mathew; Nazarko, Taras Y; Mabb, Angela M (May 2024, Journal of Biological Chemistry)

   DeMartino, George (Ed.)

   Tauopathies are neurodegenerative disorders characterized by the deposition of aggregates of the microtubule-associated protein tau, a main component of neurofibrillary tangles. Alzheimer’s disease (AD) is the most common type of tauopathy and dementia, with amyloid-beta pathology as an additional hallmark feature of the disease. Besides its role in stabilizing microtubules, tau is localized at postsynaptic sites and can regulate synaptic plasticity. The activity-regulated cytoskeleton-associated protein (Arc) is an immediate early gene that plays a key role in synaptic plasticity, learning, and memory. Arc has been implicated in AD pathogenesis and regulates the release of amyloid-beta. We found that decreased Arc levels correlate with AD status and disease severity. Importantly, Arc protein was upregulated in the hippocampus of Tau KO mice and dendrites of Tau KO primary hippocampal neurons. Overexpression of tau decreased Arc stability in an activity-dependent manner, exclusively in neuronal dendrites, which was coupled to an increase in the expression of dendritic and somatic surface GluA1-containing α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors. The tau-dependent decrease in Arc was found to be proteasome-sensitive, yet independent of Arc ubiquitination and required the endophilin-binding domain of Arc. Importantly, these effects on Arc stability and GluA1 localization were not observed in the commonly studied tau mutant, P301L. These observations provide a potential molecular basis for synaptic dysfunction mediated through the accumulation of tau in dendrites. Our findings confirm that Arc is misregulated in AD and further show a physiological role for tau in regulating Arc stability and AMPA receptor targeting. 

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4. Differential Control of Small-conductance Calcium-activated Potassium Channel Diffusion by Actin in Different Neuronal Subcompartments

   https://doi.org/10.1093/function/zqad018  

   Gu, Shiju; Tzingounis, Anastasios V; Lykotrafitis, George (January 2023, Function)

   Abstract Small-conductance calcium-activated potassium (SK) channels show a ubiquitous distribution on neurons, in both somatodendritic and axonal regions. SK channels are associated with neuronal activity regulating action potential frequency, dendritic excitability, and synaptic plasticity. Although the physiology of SK channels and the mechanisms that control their surface expression levels have been investigated extensively, little is known about what controls SK channel diffusion in the neuronal plasma membrane. This aspect is important, as the diffusion of SK channels at the surface may control their localization and proximity to calcium channels, hence increasing the likelihood of SK channel activation by calcium. In this study, we successfully investigated the diffusion of SK channels labeled with quantum dots on human embryonic kidney cells and dissociated hippocampal neurons by combining a single-particle tracking method with total internal reflection fluorescence microscopy. We observed that actin filaments interfere with SK mobility, decreasing their diffusion coefficient. We also found that during neuronal maturation, SK channel diffusion was gradually inhibited in somatodendritic compartments. Importantly, we observed that axon barriers formed at approximately days in vitro 6 and restricted the diffusion of SK channels on the axon initial segment (AIS). However, after neuron maturation, SK channels on the AIS were strongly immobilized, even after disruption of the actin network, suggesting that crowding may cause this effect. Altogether, our work provides insight into how SK channels diffuse on the neuronal plasma membrane and how actin and membrane crowding impacts SK channel diffusion. 

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5. Calcium dynamics tune developmental tempo to generate evolutionarily divergent axon tract lengths

   https://doi.org/10.1101/2024.12.28.630576  

   Lindhout, Feline W; Szafranska, Hanna M; Imaz-Rosshandler, Ivan; Guglielmi, Luca; Moarefian, Maryam; Voitiuk, Kateryna; Zernicka-Glover, Natalia K; Boulanger, Jerome; Schulze, Ulrike; Lloyd-Davies_Sánchez, Daniel J; et al (December 2024, bioRxiv)

   ABSTRACT The considerably slow pace of human brain development correlates with an evolutionary increase in brain size, cell numbers, and expansion of neuronal structures, with axon tracts undergoing an even greater evolutionary increase than other neuronal domains. However, whether tempo is responsible for these differences in magnitude, and how, remains to be determined. Here, we used brain organoids to investigate this and observed that human axon tracts spend more time growing and extend farther compared to those of mice, independent of their tissue environment. Single cell RNA sequencing analysis pointed to a subset of calcium-permeable ion channels expressed throughout neuron development, including during axon tract outgrowth. Calcium imaging during early neuron development consistently revealed a reduced calcium influx in human neurons compared to mouse neurons. Stimulating calcium influx and increasing cAMP levels resulted in premature halting of axon tract outgrowth and shorter axon tracts, mimicking the mouse phenotype, while abrogating calcium influx led to an even longer phase of axon tract outgrowth and longer axon tracts in humans. Thus, evolutionary differences in calcium regulation set the tempo of neuronal development, by extending the time window to foster the more elaborated human neuron morphology. 

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