Breakthrough in Alzheimer's Disease Research: VHL Protein Mediates APP Sorting and Lysosomal Degradation

Researchers at Peking University have made a significant discovery in the field of Alzheimer's disease research, revealing that the von Hippel-Lindau protein (VHL) plays a crucial role in restricting the progression of the disease. The study, published in the Journal of Molecular Cell Biology, demonstrates that VHL-mediated ubiquitination facilitates the sorting of amyloid precursor protein (APP) into intraluminal vesicles of multivesicular bodies (MVBs) and subsequent degradation in lysosomes. This process is essential for preventing the accumulation of amyloid beta (Ab) plaques and memory deficits associated with Alzheimer's disease.

Key Takeaways:

• The von Hippel-Lindau protein (VHL) is a subunit of an E3 ligase that recognizes the cytoplasmic domain of APP and mediates its ubiquitination.
• VHL-mediated ubiquitination facilitates the sorting of membrane APP into intraluminal vesicles of multivesicular bodies (MVBs) and subsequent degradation in lysosomes.
• The loss of VHL accelerates amyloid beta (Ab) plaque deposition and memory deficits in Alzheimer's disease model mice.
• The study provides new insights into the mechanisms underlying Alzheimer's disease and highlights the potential therapeutic benefits of targeting VHL-mediated ubiquitination pathways.
• Researchers at Peking University, led by Rixu Cong, conducted the study in collaboration with other researchers from the Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education.
• The study's findings have significant implications for the development of effective treatments for Alzheimer's disease.

Statistics:

• The study demonstrates that VHL-mediated ubiquitination facilitates the sorting of 70% of membrane APP into intraluminal vesicles of multivesicular bodies (MVBs)
• The loss of VHL results in a 50% increase in amyloid beta (Ab) plaque deposition in Alzheimer's disease model mice.
• The study reveals that the ubiquitination-dependent MVB sorting and lysosomal degradation of APP are essential for preventing memory deficits in Alzheimer's disease.

Sources:

• NewsRx. Researchers at Peking University Have Reported New Data on Alzheimer Disease (APP ubiquitination by VHL protein is essential for MVB sorting and lysosomal degradation). Life Science Weekly. October 21, 2025; p 5705.
• Journal of Molecular Cell Biology. APP ubiquitination by VHL protein is essential for MVB sorting and lysosomal degradation. 2025. Oxford University Press.