Natural Killer (NK) cells, known for their role in the body’s innate immune system, have become a focal point in research surrounding neurodegenerative diseases like Alzheimer’s, Parkinson’s, amyotrophic lateral sclerosis (ALS), and multiple sclerosis. With the ability to identify and respond to infected or abnormal cells, NK cells also influence inflammatory responses by interacting with other immune cells and releasing signaling molecules. Although the potential of NK cell therapy is being explored, researchers caution that clinical evidence is still in its infancy, and its effectiveness as a treatment is not yet established.
In a 2025 Phase I clinical study, scientists evaluated the safety of expanded NK cells in patients with Alzheimer’s disease. This study included 11 participants, with 10 completing the evaluable analysis, receiving intravenous infusions of an autologous, non-genetically modified NK cell product every three weeks. While the primary focus was on safety, researchers also observed preliminary changes in cognitive measures and biomarkers such as pTau181 and GFAP, related to neuroinflammation and neurodegeneration. Importantly, no adverse events linked to the NK cell product were reported. However, the study was not designed to determine the efficacy of NK cell therapy in preventing or slowing Alzheimer’s, and larger trials are necessary for definitive conclusions.
Interest in NK cells extends to Parkinson’s disease research, where preclinical studies have shown promising results. A 2020 study published in the Proceedings of the National Academy of Sciences highlighted NK cells’ ability to interact with and degrade alpha-synuclein aggregates in laboratory and animal models. Additionally, increased alpha-synuclein pathology and neuroinflammation were noted when NK cells were depleted in a mouse model, suggesting their potential role in regulating immune activity associated with Parkinson’s. Despite these findings, the evidence remains preclinical, and it is not yet established if NK cells can be a therapeutic option for Parkinson’s in humans.
The complexity of NK cells’ role in neurological diseases is becoming increasingly evident, as different populations of these cells can perform diverse functions. Their effects may vary depending on the disease type, stage, and surrounding tissue environment, indicating that simply increasing NK cell numbers might not guarantee beneficial outcomes. Researchers are actively investigating which NK cell populations, activation states, dosage, and treatment schedules could be effective. However, several critical questions remain unanswered, including the effectiveness of infused cells in influencing the central nervous system, their duration of activity, potential patient benefits, and their impact on long-term disease progression.
While NK cells are recognized for their immune surveillance and regulatory functions, their potential as a treatment for neurodegenerative diseases remains speculative. Research suggests they may interact with neuroinflammation and abnormal protein aggregates, particularly alpha-synuclein, but their therapeutic value in preventing or reversing such diseases is not yet proven. As NK cell therapy continues to be an investigational area of cellular medicine, further clinical studies are essential to determine its effectiveness and long-term safety. Individuals considering such therapies should consult with qualified healthcare professionals to assess available scientific evidence and safety information.
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