Клинический разбор в общей медицине №03 2026

Механобиология болезни Альцгеймера: PIEZO1 как связующее звено между снижением упругости мозговой ткани и процессом отмирания нейронов 

Халед А. Абдель-Сатер

Университет Мута, Эль-Карак, Иордания
Kabdelsater@mutah.edu.jo

Аннотация
Актуальность. Патогенез болезни Альцгеймера (БА) выходит за рамки биохимических изменений. Он включает в себя биомеханическую дисфункцию. При БА головной мозг характеризуется снижением упругости мозговой ткани, изменением напряжения сдвига стенок сосудов и нарушением динамики циркуляции жидкости. Механочувствительный ионный канал PIEZO1 преобразует эти механические сигналы в патологические сигналы, передаваемые нервными клетками.
Цель. В обзоре обобщены имеющиеся данные по PIEZO1 при БА, предложена комплексная механобиологическая модель, в которой PIEZO1 связывает механическое ремоделирование головного мозга с нарушениями на клеточном и молекулярном уровнях.
Методы. Выполнен поиск литературных источников в PubMed и Scopus с целью идентифицировать исследования экспрессии, активации и дальнейшей передачи сигнала PIEZO1 в контексте БА. Проведена критическая оценка исследований микроглии, астроцитов, нейронов, эндотелиальных клеток и перицитов на молекулярном и клеточном уровне, а также на животных с целью создать единую модель механотрансдуктивной дисфункции.
Результаты. При БА дисфункция PIEZO1 влияет на многочисленные системы организма. Сосудистые нарушения приводят к уменьшению реакции на изменение напряжения сдвига, вызывая гипоперфузию и повреждение гематоэнцефалического барьера. Вследствие уменьшения пульсации сосудов нарушается глимфатический клиренс, из-за чего хуже выводится Aβ. PIEZO1 в микроглии определяет связанное с Aβ снижение упругости, способствуя началу фагоцитоза, однако его постоянное пребывание в активном состоянии вызывает нейровоспаление; PIEZO1 в астроцитах способствует развитию реактивного глиоза. В нейронах нарушение PIEZO1 сигнализации приводит к утрате синаптической пластичности. Таким образом, устанавливается самоусиливающийся цикл: снижение упругости тканей обеспечивает все большую активность PIEZO1, приводя к обострению заболевания.
Выводы. PIEZO1 представляет собой основной механотрансдуктор, обеспечивающий интеграцию биомеханических изменений в патогенез БА. При БА PIEZO1 выступает в роли чрезвычайно значимой, но сложной терапевтической мишени. Реализация его потенциала будет зависеть от развития прецизионной «механофармакологии» – вмешательств, которые не только специфичны для определенных клеток и стадий, но также способны обеспечивать тонкую настройку активности каналов, а не просто активировать или ингибировать их. В ходе дальнейших исследований приоритет должен быть отдан разработке целевых модуляторов и более глубокому изучению временной динамики PIEZO1 сигнализации на протяжении всего периода болезни.
Ключевые слова: PIEZO1, механобиология, болезнь Альцгеймера, нейрососудистая единица, снижение упругости ткани, кальциевая сигнализация.
Для цитирования: Халед А. Абдель-Сатер. Механобиология болезни Альцгеймера: PIEZO1 как связующее звено между снижением упругости мозговой ткани и процессом отмирания нейронов. Клинический разбор в общей медицине. 2026; 7 (3): 11–14. DOI: 10.47407/kr2026.7.3.00785

Introduction
Alzheimer’s disease (AD) is classically defined by amyloid-β (Aβ) plaques, tau tangles, and neuroinflammation [1]. Beyond biochemistry, the brain’s mechanical properties – extracellular matrix (ECM) stiffness, vascular shear stress, and interstitial pressure – are dynamically regulated. Aging and AD alter these properties: protein aggregation and ECM remodeling stiffen parenchyma [1, 2], while cerebral vessels lose compliance, impairing perfusion [3].
Mechanobiology – the study of how cells sense and respond to mechanical forces—offers a new perspective on AD pathogenesis. CNS cells express mechanosensitive ion channels that translate physical cues into biochemical signals. PIEZO1, a non-selective cation channel, is widely expressed in microglia, astrocytes, neurons, and endothelial cells and is highly sensitive to membrane tension, substrate stiffness, and shear stress [4].
A growing body of evidence directly implicates PIEZO1 in AD pathology. Microglial PIEZO1 senses the heightened stiffness of Aβ fibrils, triggering Ca2+ influx that promotes phagocytosis and plaque clearance; its loss exacerbates plaque burden and cognitive deficits in mice [5]. Pharmacological activation of PIEZO1 with agonists like Yoda1 enhances microglial survival, phagocytosis, and Aβ clearance in human models, directly linking channel activity to plaque reduction [6]. Similarly, astrocytes surrounding amyloid plaques upregulate PIEZO1, particularly under inflammatory conditions [7]. This positions PIEZO1 as an active sensor of the altered mechanical landscape of the AD brain, potentially driving key pathological processes.
This review argues that PIEZO1 is not merely a passive sensor but a central integrator and amplifier. It converts the brain's physical deterioration into biochemical and cellular dysfunction, which in turn promotes further mechanical remodeling, creating a self-reinforcing pathogenic cycle that accelerates disease progression. We propose a unified mechanobiological framework for AD, in which PIEZO1 dysfunction connects vascular deficits, glial activation, and synaptic failure into a cohesive model of neurodegeneration.

Structure and mechanogating of PIEZO1
PIEZO1 is a large, trimeric ion channel with a unique three-bladed "propeller" architecture. Each subunit forms a curved blade that radiates from a central pore, creating a distinctive nano-dome structure within the membrane. Cryo-electron microscopy studies have identified intracellular "beam-like" elements that tether the blades to the pore, functioning as levers to transmit mechanical force into channel gating [8]. Upon activation by stimuli such as membrane stretch or changes in substrate stiffness, PIEZO1 opens, permitting a rapid influx of cations, primarily Ca2+ and Na+ [9]. This ion flux initiates diverse downstream signaling cascades, including the activation of calcium/calmodulin-dependent kinases (CaMKs), calcineurin, NF-κB, and triggers cytoskeletal reorganization and transcriptional changes [10]. Research tools like the agonist Yoda1 and the peptide antagonist GsMTx4 are instrumental in probing PIEZO1's functions [9]. Although its gating kinetics are cell-type-dependent, the fundamental principle of force-to-signal conversion is a conserved feature of PIEZO1 biology [10].

Mechanical remodeling in the Alzheimer’s brain
The AD brain undergoes significant mechanical remodeling that actively drives disease progression [11]. Tissue stiffness escalates due to the combined effects of Aβ plaques, neurofibrillary tangles, and reactive gliosis, which promote the deposition of ECM proteins like collagen [11, 12]. Concurrently, vascular mechanics are compromised, featuring reduced cerebral blood flow, arterial stiffening, and blood-brain barrier (BBB) breakdown, which disrupts shear stress and interstitial fluid dynamics [13].
PIEZO1 is aberrantly activated in this altered mechanical environment. For instance, microglia encountering stiff Aβ plaques upregulate PIEZO1, initiating Ca2+-dependent signaling pathways [11]. This mechanosensitive activation extends across cell types: glial PIEZO1 promotes neuroinflammation via NF-κB and inflammasomes [14]; endothelial PIEZO1 modulates BBB integrity and oxidative stress [15]; and neuronal PIEZO1 influences Ca2+ homeostasis and potentially tau pathology [14].
This creates a self-reinforcing, feed-forward cycle. Initial Aβ deposition and aging-related stiffening activate PIEZO1, which in turn amplifies vascular dysfunction, impairs glymphatic clearance, heightens inflammation, and promotes further ECM remodeling and neuronal injury [16, 17]. This mechanopathogenic cycle establishes PIEZO1 as a central node, physically linking the brain's deteriorating biomechanics to the classic hallmarks of AD [15, 17] (Figure).

Cell-type-specific roles of PIEZO1 in ad pathobiology
Microglia: Sensing Stiffness and Directing Amyloid Clearance. Microglial PIEZO1, upregulated near Aβ plaques, senses fibril stiffness, triggering Ca2+ influx that drives clustering, migration, and phagocytic clearance of Aβ. The functional importance of this pathway is underscored by evidence that microglial PIEZO1 deletion in mice increases plaque burden and accelerates cognitive decline, whereas pharmacological activation with Yoda1 enhances lysosomal activity, Aβ phagocytosis, and memory [5, 6].
Astrocytes: Modulating Reactive States and Synaptic Function. Reactive astrocytes surrounding amyloid plaques exhibit heightened PIEZO1 expression, a response amplified by peripheral inflammation [7]. Activation of astrocytic PIEZO1 regulates Ca2+ oscillations, ATP release, and cytokine profiles, often reducing pro-inflammatory factors like IL-1β and TNF-α [18]. In vivo, astrocyte-specific PIEZO1 deletion disrupts hippocampal neurogenesis, long-term potentiation (LTP), and memory, while its overexpression enhances synaptic plasticity and cognition [19]. The detrimental role of PIEZO1 in inflammation is further amplified by the finding that inflammatory conditions can 'sensitize' astrocytic PIEZO1 channels, lowering their activation threshold and leading to exaggerated calcium responses that fuel neuroinflammation.

Endothelial Cells and Pericytes: Governing Vascular Integrity
As a primary shear-stress sensor in the vasculature, endothelial PIEZO1 generates Ca2+ signals in brain capillaries, implicating it in neurovascular coupling [20]. Pathologically, Aβ1-40 directly potentiates PIEZO1 activity in endothelial cells, increasing its mechanosensitivity [17]. Furthermore, endothelial PIEZO1 mediates blood-flow-dependent pericyte proliferation via Notch signaling, a key process for neurovascular unit development and integrity [22]. In disease states, however, excessive PIEZO1 activation can contribute to BBB disruption and inflammation, highlighting its dual role in vascular health and pathology. The critical role of PIEZO1 in vascular pathology is underscored by in vivo evidence showing that its inhibition with the antagonist GsMTx4 preserves BBB integrity and prevents cognitive impairment in models of chronic cerebral hypoperfusion, a key contributor to vascular dementia.


Neurons: Direct and Indirect Influences on Synaptic Health
While PIEZO1 expression is lower in mature neurons than in glia, it can influence neurite outgrowth, synaptic plasticity, and Ca2+ homeostasis [4]. More significantly, PIEZO1 indirectly governs neuronal health through its roles in microglial plaque clearance, astrocytic synaptic support, and endothelial regulation of blood flow. Preliminary evidence also suggests a potential link to tau phosphorylation, meriting further investigation.



The context-dependent duality of PIEZO1 signaling
The impact of PIEZO1 activation is not universally beneficial or detrimental but is instead determined by cell type, disease stage, and pathological context.
• Microglia: In early AD, PIEZO1 activation is protective, promoting Aβ phagocytosis [5]. In chronic phases, sustained activation may lead to oxidative stress and phagocytic dysfunction [11].
• Vasculature: Under physiological conditions, PIEZO1 is crucial for flow sensing and vascular development [22]. In chronic hypoperfusion or advanced AD, its overactivation contributes to BBB disruption by driving oxidative stress and tight junction damage via the CaMKII/Nrf2 pathway [15]. Therapeutically, PIEZO1 inhibition with GsMTx4 in such contexts has been shown to preserve BBB integrity, reduce neuroinflammation, and prevent cognitive impairment [23].
• Astrocytes: Acute PIEZO1 signaling supports neurogenesis and synaptic function [19]. Under persistent mechanical stress or inflammation, it may drive the transition to a chronic reactive state, exacerbating gliosis [24].

Mechanopharmacology: therapeutic modulation of PIEZO1
The dual nature of PIEZO1 signaling necessitates precise therapeutic strategies.
• Agonist-Based "Mechanoboosting": Using compounds like Yoda1 to activate microglial PIEZO1 represents a promising strategy to enhance Aβ clearance in early AD, as demonstrated in preclinical models [6].
• Antagonist-Based Protection: In contexts of vascular dysfunction, inhibitors like GsMTx4 can block maladaptive PIEZO1 signaling, protecting the BBB and reducing inflammation [23].
• Challenges and Future Directions: The primary challenge is achieving cell-type and context specificity to avoid off-target effects, given PIEZO1's widespread expression. Future efforts must focus on developing brain-penetrant, biased modulators, and targeted delivery systems (e.g., nanoparticles, viral vectors) to direct therapies to specific cell populations.
Furthermore, the potential benefits of PIEZO1 inhibition may extend beyond the vasculature. Evidence suggests that maladaptive PIEZO1 signaling contributes to white matter damage, as GsMTx4 has been shown to attenuate demyelination in certain models. This opens another promising avenue for therapeutic intervention in AD, where white matter integrity is frequently compromised (Table).

Research frontiers and key gaps
To translate these mechanistic insights into therapies, several priorities must be addressed:
1. Conditional Genetic Models. Cell-type-specific (e.g., microglia, astrocyte, endothelium) PIEZO1 knockout/overexpression studies in AD models are needed to establish causal relationships.
2. Temporal Dynamics. Longitudinal studies mapping PIEZO1 expression and activity across disease stages are crucial to determine the optimal window for intervention.
3. Downstream Signaling. A comprehensive mapping of PIEZO1-triggered pathways (CaMK, NF-κB, NLRP3) in each CNS cell type in AD contexts is required.
4. Human Validation. Investigating PIEZO1 expression and activation in human post-mortem AD brain tissue using spatial transcriptomics and proteomics is essential.
5. Drug Development. There is an urgent need for novel, brain-penetrant PIEZO1 modulators. Future efforts should focus on developing biased ligands that can activate beneficial downstream pathways (e.g., for phagocytosis) while avoiding detrimental ones (e.g., for inflammasome activation), as well as advanced delivery systems (e.g., nanoparticle – or antibody-mediated targeting) for cell-type-specific modulation.

Conclusion
PIEZO1 functions as a central mechanotransducer in AD, linking pathological brain stiffening to signaling pathways that regulate Aβ clearance, neuroinflammation, vascular integrity, and synaptic function. Its dual, context-dependent roles are both a challenge and opportunity. Realizing its therapeutic potential requires precision mechanopharmacology – interventions that are molecule-, cell-, and stage-specific. Incorporating biomechanical perspectives, targeting PIEZO1 provides a novel, holistic approach to disrupt neurodegeneration and alter disease progression.

Conflict of interests. The author declares that there is not conflict of interests.
Конфликт интересов. Автор заявляет об отсутствии конфликта интересов.

Список литературы доступен на сайте журнала https://klin-razbor.ru/
The list of references is available on the journal‘s website https://klin-razbor.ru/

Информация об авторе
Information about the author

Khaled A. Abdel-Sater – MD, Department of Dental and Medical Sciences, Faculty of Dentistry, Mutah University, Alkarak, Jordan. E-mail: Kabdelsater@mutah.edu.jo; ORCID: 0000-0001-9357-4983

Халед А. Абдель-Сатер – доктор медицины, Кафедра стоматологии и медицинских наук, стоматологический факультет, Университет Мута, Эль-Карак, Иордания. 
E-mail: Kabdelsater@mutah.edu.jo; ORCID: 0000-0001-9357-4983

Поступила в редакцию: 13.11.2025
Поступила после рецензирования: 24.11.2025
Принята к публикации: 04.12.2025

Received: 13.11.2025
Revised: 24.11.2025
Accepted: 04.12.2025