by Lund University
HD-iNs exhibit neurite specific autophagy alteration. (A) Reduced BECN1 expression in HD-iNs compared to Ctrl-iNs using western blot (n = 10 replicates for control and n = 9 replicates for HD-iNs). (B) LC3B-II levels are significantly increased in the HD-iNs, while the LC3B-II/I ratio decreased compared to the healthy Ctrl-iNs (n = 6 replicates). (C–H) Representative images and statistical analysis shows a significant increase both in number and size of LC3B, p62 and LAMP1 dots in the MAP2+ neurites of HD-iNs compared to controls (n = 6 lines). (I) Representative images of human post-mortem striatal tissue from a healthy control and three different Huntington’s disease patients at different disease stages showing p62 accumulation specifically in the neurites as visualized by a neurofilament specific antibody. ***P < 0.001; **P < 0.01; *P < 0.05; two-tailed unpaired T-tests were used. All data are shown as mean ± SEM. Western blot values were normalized to Ctrl-iNs expression levels and corrected to actin values. Scale bar = 20 µm. Credit: Brain (2021). DOI: 10.1093/brain/awab473
Researchers at Lund University in Sweden have developed a new method for studying age-related brain disorders. The researchers have focused on the neurodegenerative disorder Huntington’s disease and the results have now been published in the journal Brain.
Basic medical research often faces the challenge of developing disease models that correspond to specific disease mechanisms or the disease to be studied. This is a challenge that needs to be solved in order to produce new effective treatments. One example of a disease that is difficult to model for an understanding of the underlying mechanisms is Huntington’s disease. In part, this is due to the difficulty in recreating adequate animal or cellular models.
By reprogramming skin cells into neurons, Johan Jakobsson and his research group have been able to study Huntington’s disease in an innovative way that he believes could be significant for successful studies of several age-related brain disorders.
“We took skin biopsies from patients living with Huntington’s disease and reprogrammed the skin biopsies into neurons. We then compared these neurons with reprogrammed neurons from healthy people. The results are very interesting. We have found several defects that explain some of the disease mechanisms in neurons from patients with Huntington’s disease. Among other things, we observed that neurons from patients with Huntington’s disease show problems in breaking down and recycling a particular kind of protein—which can lead to a lack of energy in these cells,” says Johan Jakobsson, professor of neuroscience at Lund University.
The researchers have also measured the biological age of the cells and observed that the reprogrammed neurons retain their biological age, which is significant if they are to be used for research in the new model system.
“One very important component in our new model system is the age of the neurons. It is possible to measure a cell’s ‘biological age,’ which we have done, and these cells retain their true biological age. In other words, the reprogrammed neurons are old, making the model system relevant in the study of other age-related neurodegenerative disorders such as Parkinson’s and Alzheimer’s,” says Johan Jakobsson.
Huntington’s disease is fatal, and scientists are yet to find any treatment or cure.
“We believe our model will provide answers and clues that are significantly more relevant for the disease than the clues obtained from animal studies, and that in the long term it will lead to breakthroughs for some form of treatment,” says Johan Jakobsson.
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