Clostridium epsilon toxin is excessive in multiple sclerosis and provokes multifocal lesions in mouse models

Area of Science:

• Neuroimmunology
• Microbiology
• Toxicology

Background:

• Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system (CNS).
• The etiology of MS is complex, involving genetic and environmental factors.
• The role of the gut microbiome in MS pathogenesis is an area of active investigation.

Purpose of the Study:

• To investigate the potential role of intestinal bacteria and their toxins in the development of multiple sclerosis.
• To explore the mechanism by which epsilon toxin (ETX) might contribute to MS-like pathology.

Main Methods:

• Detection of Clostridium perfringens strains in MS patients.
• Induction of experimental autoimmune encephalomyelitis (EAE) in mice with myelin antigens and ETX.
• Histopathological analysis of brain lesions.
• Assessment of ETX binding to CNS endothelial cells and human white blood cells.

Main Results:

• Two strains of Clostridium perfringens producing ETX were frequently identified in patients with MS.
• Low-dose ETX administration with myelin antigens induced diffuse, MS-like brain lesions in mice.
• ETX enhanced immune cell trafficking across the blood-brain barrier into the CNS.
• ETX demonstrated binding to human white blood cells, suggesting a potential impact on immune responses.

Conclusions:

• Intestinal Clostridium perfringens and its epsilon toxin may represent an environmental factor contributing to MS pathogenesis.
• ETX-induced disruption of the blood-brain barrier and altered immune cell function could play a role in MS development.
• These findings suggest potential interactions between ETX, host genetics, and environmental factors in MS.