their paper published in Cell<\/a>. \u201cThis raises questions about AD development in the general population.\u201d<\/p>\n<\/p>\nNovel Mechanism Behind Alzheimer\u2019s Development<\/p>\n
What makes this discovery remarkable is how PHGDH causes damage. Rather than working through its known enzymatic activity, PHGDH appears to switch roles entirely, functioning as a gene regulator that promotes inflammation and impairs autophagy \u2013 the brain\u2019s natural cleanup process.<\/p>\n
The team demonstrated this by introducing mutations that eliminated PHGDH\u2019s enzymatic function but left its regulatory capabilities intact. The mutated enzyme still promoted amyloid buildup, confirming this previously uncharacterized role is what drives the disease process.<\/p>\n
\u201cPHGDH has an uncharacterized role in transcriptional regulation,\u201d the researchers explain, describing how the enzyme influences the activity of other genes involved in inflammation and cellular cleanup.<\/p>\n
Could targeting this transcriptional function provide a new approach to treating Alzheimer\u2019s where other methods have failed?<\/p>\n
Multiple Experimental Models Support Findings<\/p>\n
The researchers validated their findings using several complementary approaches. In mice engineered to produce more PHGDH in brain cells, amyloid levels increased significantly. When they reduced PHGDH in human brain organoids \u2013 miniature lab-grown brain-like tissues \u2013 amyloid aggregates decreased and neural connections were protected.<\/p>\n
Most compellingly, the team identified a small molecule called NCT-503 that can disrupt PHGDH\u2019s harmful regulatory activity without affecting its necessary metabolic functions. When administered to mice with Alzheimer\u2019s-like pathology, NCT-503 reduced amyloid plaques by approximately 50% in key brain regions.<\/p>\n
Improved Cognitive Function in Behavioral Tests<\/p>\n
In the Barnes maze test, which assesses spatial learning and memory, mice treated with NCT-503 demonstrated improved performance compared to untreated mice with Alzheimer\u2019s-like pathology. The compound also reduced anxiety-like behaviors in these animals.<\/p>\n
The researchers suggest that PHGDH works by activating two key regulatory proteins \u2013 IKKa and HMGB1 \u2013 which then suppress autophagy and accelerate amyloid pathology. When these proteins were simultaneously reduced, Alzheimer\u2019s pathology improved, confirming this pathway\u2019s importance.<\/p>\n
Early Detection Potential<\/p>\n
The PHGDH enzyme had previously been identified as a biomarker for Alzheimer\u2019s, with elevated levels observed in patients\u2019 brain tissue and blood plasma even before clinical symptoms appear. This study establishes its causal role in disease development, potentially enabling earlier intervention.<\/p>\n
While substantial work remains before these findings can be translated to human treatments, this research provides a compelling explanation for how Alzheimer\u2019s develops in the general population and identifies a promising target for intervention.<\/p>\n
As our population ages and Alzheimer\u2019s cases continue to rise, understanding these fundamental disease mechanisms and targeting them with innovative approaches may prove crucial in developing effective therapies for this devastating condition affecting millions worldwide.<\/p>\n
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