A recent study from Northwestern University has uncovered a potential new cause of neuron death in Alzheimer’s disease related to toxic RNA strands. Alzheimer’s, affecting approximately 32 million people globally, is characterized by a significant loss of neurons in the brain.
The study, published in Nature Communications, investigated the role of RNA in brain cell loss associated with Alzheimer’s. Researchers focused on two classes of RNA: long messenger (m)RNAs, which code for proteins, and short (s)RNAs, which suppress the activity of mRNAs.
They discovered a ‘kill code’ embedded in sRNAs, consisting of a sequence just six nucleotides long. This code, when present, can kill cells by selectively suppressing mRNAs vital for cell survival.
The study also found that the balance between toxic and protective sRNAs is critical. With age, the protective sRNAs decrease, and toxic ones increase, leading to neuron death. This process is particularly pronounced in brain cells, making them more susceptible to the toxic effects of sRNAs.
The research provides a new model for understanding neuron death in Alzheimer’s, suggesting that toxic sRNAs are downstream of beta-amyloid and tau proteins, commonly associated with Alzheimer’s pathology. The findings open new avenues for drug development targeting either increasing protective sRNAs or inhibiting toxic ones.
Experts in the field view these findings as promising for future treatments of Alzheimer’s and other neurodegenerative diseases. However, more research is needed to fully understand the mechanisms and to develop effective therapeutic strategies.
Source: Medical News Today
