Smouldering Lesion in MS: Microglia, Lymphocytes and Pathobiochemical Mechanisms

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• Multiple sclerosis (MS) is a chronic CNS disease characterized by inflammation, demyelination, and neurodegeneration.
• Immune cell infiltration leads to persistent macrophage/microglia activation, causing demyelination and neurodegeneration.
• Chronic inflammation underlies smoldering lesions, associated with continuous demyelination and poor prognosis.

Purpose of the Study:

• To review the pathobiochemical markers and mechanisms driving neurodegeneration in MS smoldering lesions.
• To elucidate the relationship between these markers and clinical disease progression.
• To understand the link between MS clinical classification and pathomechanisms.

Main Methods:

• Review of existing literature on MS pathogenesis.
• Analysis of pathobiochemical factors within smoldering lesions.
• Discussion of immune mediators, oxidative stress, mitochondrial damage, hypoxia, iron, and glutamate.

Main Results:

• Smoldering lesions create a toxic environment contributing to neurodegeneration.
• Oxidative stress, mitochondrial dysfunction, hypoxia, iron, and glutamate are implicated in cell death.
• These factors, alone or combined, drive neuronal, axonal, and glial cell death.

Conclusions:

• Pathobiochemical markers in smoldering lesions are crucial for neuroinflammation and neurodegeneration in MS.
• Understanding these markers provides insight into MS progression and clinical subtypes.
• Targeting these mechanisms may offer therapeutic strategies for progressive MS.