Defects in calcium homeostasis and mitochondria can be reversed in Pompe disease

Area of Science:

• Biochemistry
• Cell Biology
• Genetics

Background:

• Mitochondrial dysfunction and impaired autophagy are hallmarks of neurodegenerative and lysosomal storage diseases (LSDs).
• While defective autophagy is recognized in Pompe disease, mitochondrial function remains understudied in this LSD.
• Pompe disease is a severe myopathy affecting cardiac and skeletal muscles.

Purpose of the Study:

• To investigate mitochondrial function in mouse and human models of Pompe disease.
• To explore the role of calcium homeostasis and L-type calcium channels in Pompe disease pathogenesis.
• To identify potential therapeutic targets for Pompe disease and related disorders.

Main Methods:

• Analysis of mitochondrial function markers (e.g., reactive oxygen species, membrane potential, ATP production) in Pompe disease models.
• Assessment of calcium (Ca2+) homeostasis and L-type calcium channel expression.
• Gene expression studies in affected muscle cells.

Main Results:

• Pompe disease models exhibit significant mitochondrial defects, including calcium overload, increased reactive oxygen species, and reduced ATP production.
• Dysregulated calcium homeostasis and increased L-type Ca2+ channel subunit β1 expression were observed.
• Caspase-independent apoptosis and decreased oxygen consumption were noted.

Conclusions:

• Mitochondrial abnormalities and disturbed calcium homeostasis are early pathogenic events in Pompe disease.
• L-type calcium channel blockers effectively reversed mitochondrial defects in Pompe models.
• Targeting calcium channels could be a promising therapeutic approach for LSDs and neurodegenerative diseases.