Lymphocyte subpopulations in multiple sclerosis: serial studies and clinical correlations

Area of Science:

• Immunology
• Neurology
• Hematology

Background:

• Multiple Sclerosis (MS) is a chronic neurological disease characterized by immune-mediated damage to the central nervous system.
• Peripheral blood immune cell profiles in MS patients, particularly T cells and B cells (SIg+), are not fully understood in relation to disease activity and progression.

Purpose of the Study:

• To investigate differences in total lymphocyte counts and T cell and surface immunoglobulin-positive (SIg+) cell numbers in the peripheral blood of MS patients compared to healthy controls.
• To analyze these cell counts in relation to disease activity, relapse status, clinical progression, and HLA phenotype.

Main Methods:

• Peripheral blood samples were analyzed for total lymphocyte counts and T cell and SIg+ cell numbers and percentages.
• Patients were categorized into relapse, post-ACTH treatment, and non-relapsing progressive groups.
• Serial studies were conducted on a subset of patients during relapse and recovery phases.

Main Results:

• MS patients had significantly lower total lymphocyte and T cell counts, and significantly elevated SIg+ cell numbers and percentages compared to controls.
• Abnormalities in T and SIg+ cells were most pronounced in progressive disease and during recovery after relapse.
• SIg+ cell numbers correlated negatively with relapse rate and positively with the disability-to-relapse ratio.

Conclusions:

• Peripheral blood T cell and SIg+ cell abnormalities in MS may be secondary to the pathological process, potentially due to antigenic stimulation.
• These immune cell alterations might play a role in influencing disease recovery or progression in Multiple Sclerosis.