RABGGTB plays a critical role in ALS pathogenesis

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease characterized by motor neuron loss and the aggregation of abnormal proteins.
• Autophagy is a cellular degradation process crucial for clearing these toxic protein aggregates in ALS.
• Protein prenylation, specifically via RABGGTB, influences protein localization and has been implicated in regulating autophagy.

Purpose of the Study:

• To investigate the role of RABGGTB, a component of the prenyltransferase GGTase II, in ALS pathogenesis.
• To determine if overexpressing RABGGTB can ameliorate cellular pathology in ALS models.
• To explore the therapeutic potential of targeting protein prenylation for ALS treatment.

Main Methods:

• Overexpression of RABGGTB using lentiviral transfection in NSC34-hSOD1G93A and TDP-43 cell models of ALS.
• Assessment of cell proliferation and autophagosome-lysosome fusion.
• Quantification of abnormal SOD1 protein aggregation.

Main Results:

• RABGGTB overexpression significantly improved cell proliferation in ALS models.
• Enhanced autophagosome-lysosome fusion was observed, indicating improved autophagic flux.
• A notable reduction in the aggregation of mutant SOD1 protein was achieved.
• RABGGTB overexpression positively affected Rab7 geranylgeranylation, a key step in autophagy regulation.

Conclusions:

• Protein prenylation, modulated by RABGGTB, plays a critical role in cellular proliferation and autophagy in the context of ALS.
• Enhanced autophagy and reduced protein aggregation through RABGGTB overexpression demonstrate its therapeutic potential.
• Targeting protein prenylation pathways represents a novel and promising therapeutic strategy for Amyotrophic Lateral Sclerosis.