Researchers identify a potential path against inherited neurological disease

Researchers at the Icahn School of Medicine at Mount Sinai and NCATS identified compounds that reversed the effects of several neurodegenerative diseases called lysosomal storage disorders (LSDs) in patient cells and mice. LSDs are characterized by genetic defects that prevent the cell’s lysosomes from breaking down and recycling fats, sugars and proteins, which can accumulate in the liver and brain. This can cause a malfunction in the energy-producing mitochondria. The compounds increased the activity of TRAP1, a protein that helps the mitochondria work properly. Above, lipid-filled lysosomes (red) from Niemann-Pick disease type C1 cells are normalized when mitochondrial TRAP1 (green) is activated. Credit: Ioannou Lab, Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai

Scientists at the Icahn School of Medicine at Mount Sinai in New York, the National Center for Advancing Translational Sciences (NCATS), and elsewhere have reversed the effects of several life-threatening inherited neurodegenerative diseases lysosomal storage disorders (LSDs) in called patient cells and mice.

The team, led by Mount Sinai’s Yiannis Ioannou, Ph.D., and translational scientist Juan Marugan, Ph.D., at NCATS, part of the National Institutes of Health, restored the proper function of both the mitochondria and lysosomes by using novel compounds they identified that increased the activity of TRAP1. This protein helps the mitochondria, which produce energy within cells, function properly. The findings were reported recently in iScience.

Dr. Ioannou is a Professor of Genetics and Genomic Sciences at the Icahn School of Medicine at Mount Sinai.

LSDs are characterized by genetic defects that prevent the cell’s lysosomes from breaking down and recycling fats, sugars, and proteins, leading to their accumulation in organs, including the liver and brain. This can cause a malfunction in the mitochondria, leading to further damage to these organs.

What did the study seek to uncover?

Researchers have long been looking for drugs that could affect the lysosomes to try to impact lysosomal storage diseases. This is a new approach to these diseases. Increasing TRAP1 activity promoted mitochondrial protein-folding and facilitated the cell’s proper balance. These first-in-class molecules activate TRAP1 in the mitochondria and reduce storage in lysosomal storage diseases.

The data demonstrate that mitochondrial TRAP1 is a potential novel therapeutic target for multiple disorders that affect the central nervous system. The researchers discovered that TRAP1-initiated a “crosstalk” between mitochondria and lysosomes, which they determined was essential to restoring the internal cellular balance. What was surprising, noted the researchers, is that TRAP1, when activated, initiates a cascade that leads to restoration of normal lysosomal function in lysosomal storage diseases. The defect causing each lysosomal disease is still present, but this crosstalk bypasses the genetic defect.

The team showed that increasing the activity of TRAP1 in cells from people with Niemann-Pick disease type C1, a type of LSD, could correct the lipid storage disorder and restore normal cholesterol levels. In addition, increased TRAP1 activity in patient cells from other LSDs such as Fabry, Farber, and Wolman diseases also corrected their respective lipid storage. (Niemann-Pick disease type C1 is a rare inherited disorder that affects the body’s ability to metabolize fat within cells.)

Dr. Ioannou and his colleagues developed a test to measure the effect of compounds on Niemann-Pick disease type C1. They teamed up with Dr. Marugan and NCATS scientists who used the test with NCATS’ high-throughput screening facilities to rapidly sift through thousands of compounds.

They discovered that compounds that activated TRAP1 made the mitochondria work properly again and restarted the lysosomes’ recycling ability, helping reduce fats in the lysosomes and cells. The researchers chemically improved the compounds that appeared to work best and tested them further.

The researchers suggest the findings could have implications for other neurodegenerative diseases that have similar underlying causes, such as Parkinson’s, amyotrophic lateral sclerosis, and Alzheimer’s.

The scientists would like to understand more about how the compounds can reverse characteristics of the lysosomal storage diseases, which will be instrumental in developing potential drug treatments. They also plan to continue refining these compounds and examining their effects in various models, including their ability to affect more common neurological disorders such as Alzheimer’s and Parkinson’s diseases.


PITT pathway: Scientists discover how cells repair longevity-promoting ‘recycling system’


More information:
Fannie W. Chen et al, Activation of mitochondrial TRAP1 stimulates mitochondrial-lysosome crosstalk and correction of lysosomal dysfunction, iScience (2022). DOI: 10.1016/j.isci.2022.104941

Provided by The Mount Sinai Hospital

Citation: Researchers identify a potential path against inherited neurological disease (2022, September 8) retrieved 8 September 2022 from https://phys.org/news/2022-09-potential-path-inherited-neurological-disease.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Leave a Comment