Inhibitors of metabolism rescue cell death in Huntington's disease models

Area of Science:

• Neurodegenerative Disorders
• Molecular Biology
• Drug Discovery

Background:

• Huntington's disease (HD) is an inherited neurodegenerative disorder characterized by neuronal loss.
• The disease stems from polyglutamine expansions in the huntingtin (htt) protein.
• Current therapeutic options for HD are limited, and the mechanisms of neuronal death remain unclear.

Purpose of the Study:

• To identify small molecules capable of slowing neuronal loss in Huntington's disease.
• To investigate the mechanisms underlying the protective effects of identified compounds.

Main Methods:

• Screened 1,040 biologically active molecules using a neuronal cell culture model of HD.
• Evaluated the efficacy of identified compounds in both cell culture and in vivo HD models.
• Investigated the role of ERK and AKT signaling pathways in mediating the protective effects.

Main Results:

• Inhibitors of mitochondrial function and glycolysis demonstrated significant rescue of cell death in HD models.
• These metabolic inhibitors protected neurons by activating prosurvival ERK and AKT signaling pathways.
• The protective effect was dependent on ERK and AKT activation, as confirmed by chemical inhibition and growth factor activation studies.

Conclusions:

• Targeting metabolic pathways can activate prosurvival signaling (ERK/AKT) to protect against neuronal loss in Huntington's disease.
• This mechanism offers a potential therapeutic strategy for Huntington's disease.
• The findings may also be applicable to other neurodegenerative disorders.