Lymphatic dysfunction correlates with inflammation in a mouse model of amyotrophic lateral sclerosis

Area of Science:

• Neuroscience
• Immunology
• Vascular Biology

Background:

• Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease characterized by motor neuron loss.
• Neuroinflammation and systemic immune activation are key drivers of ALS progression.
• The lymphatic system's role in the central nervous system (CNS) and its potential involvement in neurodegenerative diseases are emerging areas of research.

Purpose of the Study:

• To investigate the structure and function of the lymphatic system in a mouse model of ALS (SOD1-G93A).
• To determine if lymphatic dysfunction is associated with neuroinflammation and disease progression in ALS.

Main Methods:

• Assessment of lymphatic vessel structure and function in SOD1-G93A mice.
• Analysis of lymph transport, intrinsic lymphatic vessel contractions, and lymphatic marker expression.
• Correlation of lymphatic findings with markers of inflammation in skeletal muscle and spinal cord.

Main Results:

• SOD1-G93A mice exhibited significant lymph transport dysfunction.
• Diminished tonic and phasic contractions of intrinsic lymphatic vessels were observed.
• An association was found between increased inflammation and upregulation of lymphatic markers.
• No major structural changes in lymphatic network coverage were detected in skeletal muscle and spinal cord.

Conclusions:

• The lymphatic system's function is compromised in the SOD1-G93A mouse model of ALS.
• Lymphatic dysfunction, characterized by impaired transport and contractility, may contribute to ALS progression.
• Targeting lymphatic system dysfunction presents a potential therapeutic avenue for ALS.