Gold Nanoparticle Nasal Spray Delivers Targeted Lithium Therapy to Brain for Neuropsychiatric Disorders
核心洞察
Italian researchers have developed lithium-loaded gold nanoparticles (搜索) delivered via nasal spray that target the brain directly, bypassing systemic circulation and reducing side effects associated with oral lithium therapy.
The nanotechnology successfully inhibited GSK-3β (搜索) enzyme activity in mouse hippocampus and restored memory deficits in an Alzheimer's disease (搜索) model after two months of treatment.
The approach achieves therapeutic lithium concentrations using significantly lower doses than oral administration, potentially revolutionizing treatment for bipolar disorder (搜索), Alzheimer's disease (搜索), and viral brain infections.
Scientists at Università Cattolica (搜索) Rome campus and Fondazione Policlinico Universitario A. Gemelli IRCCS (搜索) have developed a revolutionary nasal spray containing lithium-loaded gold nanoparticles (搜索) that delivers targeted treatment directly to the brain for neuropsychiatric and neurodegenerative diseases. The breakthrough technology, published in Advanced Materials and already patented internationally, represents a potentially transformative approach to treating bipolar disorder (搜索), Alzheimer's disease (搜索), and brain infections caused by Herpes Simplex Virus type 1 (搜索).
Targeted Brain Delivery System
The innovative nanotechnological device uses tiny gold particles as carriers to transport lithium directly to brain tissue through intranasal administration. This approach bypasses systemic circulation, allowing researchers to achieve therapeutic effects with significantly lower lithium concentrations compared to traditional oral formulations while reducing the risk of adverse effects on organs such as kidneys and thyroid.
"Our challenge was to develop a device that would allow us to exploit the therapeutic potential of lithium without causing adverse effects and that could be delivered in a site-specific manner, avoiding systemic administration," explained Roberto Piacentini, associate professor of Physiology at Università Cattolica (搜索).
The research team, led by Piacentini along with Antonio Buonerba and Alfonso Grassi from the University of Salerno, and Claudio Grassi from Università Cattolica (搜索), demonstrated that the technology can directly inhibit glycogen synthase kinase-3 beta (搜索) (GSK-3β (搜索)), an enzyme that plays a key role in the development of neuropsychiatric and neurodegenerative diseases.
Promising Preclinical Results
In experimental studies, the researchers showed that five days of administration of gold nanoparticles (搜索) functionalized with glutathione and coated with lithium (LiG-AuNPs (搜索)) significantly inhibited GSK-3β (搜索) kinase activity in the hippocampus of mice. More remarkably, the same treatment repeated for two months led to significant regression of memory deficits in a mouse model of Alzheimer's disease (搜索), analyzed at both behavioral and molecular levels, without adverse events in treated animals.
"Gold nanoparticles (搜索) are the optimal tool for this type of strategy," noted Buonerba. "They can be functionalized with glutathione, which, on the one hand, promotes the formation of aggregates that easily enter cells and, on the other, allows molecules or ions, such as lithium, to bind. Once the nanoparticle aggregates enter the cells, they are broken down and the lithium is released into the cells, allowing effective therapeutic concentrations of this ion to be obtained with low doses of administration."
Targeting Critical Disease Mechanisms
GSK-3β (搜索) is essential for many cellular functions, with an estimated 100+ proteins targeted by this kinase. Abnormal activation of this enzyme can cause malfunctioning of target proteins and promote the onset of various diseases. In neurodegenerative diseases like Alzheimer's disease (搜索) and neuropsychiatric disorders such as bipolar disorder (搜索), hyperactivation of GSK-3β is observed, involving key proteins such as tau protein (搜索) and aberrant activation of the Wnt/β-catenin pathway (搜索).
The enzyme is also involved in the entry of various viruses, including Herpes Simplex 1 and SARS-CoV-2, making it a critical target for preventing brain infections that recent studies have linked to increased risk of neurological diseases.
Safety and Manufacturing Advantages
The intranasal delivery route offers significant safety advantages by directly targeting the brain and bypassing systemic circulation. Gold, an inert metal proven harmless in biological systems, is eliminated through renal excretion, limiting accumulation in the brain following repeated administrations over time.
"The versatility of this new pharmaceutical vector is extraordinary," emphasized Buonerba. "The nanoparticles developed can be loaded with different pharmacological active ingredients and are able to evade biological cellular defenses, allowing their targeted transport to specific physiological active sites."
The manufacturing process also presents practical advantages. "Our nanoparticles can be synthesized very easily and that simplifies the production process, keeping low the costs of manufacturing a product that may be launched on the pharmaceutical market in the near future," concluded Alfonso Grassi.
Clinical Translation Pathway
The research was funded by an award from the Alzheimer's Association (USA) to Professors Piacentini and Buonerba, with additional support from the Agostino Gemelli IRCCS University Hospital Foundation. Studies are currently underway to verify other areas of application for this device and to complete safety assessments in preparation for clinical application.
"We believe that our nanotechnological tool can enable the development of new therapeutic approaches not only for psychiatric disorders but also for neurodegenerative and viral diseases in which altered GSK-3β (搜索) activity in the brain plays a key role," stated Claudio Grassi, Professor of Physiology and Director of the Department of Neuroscience at Università Cattolica (搜索).