Leukocytes from multiple sclerosis patients respond to alpha- and gamma-interferons

Area of Science:

• Immunology
• Neuroimmunology
• Virology

Background:

• Multiple sclerosis (MS) is an autoimmune disease affecting the central nervous system.
• Interferons (IFN) play a crucial role in immune regulation and antiviral responses.
• Leukocyte function in MS patients requires further investigation, particularly their response to interferons.

Purpose of the Study:

• To evaluate the reactivity of blood mononuclear leukocytes from multiple sclerosis (MS) patients to alpha- and gamma-interferon (IFN).
• To determine if MS patient leukocytes can be primed by interferons to enhance subsequent interferon synthesis.
• To compare the interferon production capacity of MS patient leukocytes with that of normal controls.

Main Methods:

• Blood mononuclear leukocytes were isolated from MS patients and healthy controls.
• Leukocytes were treated in vitro with natural alpha-interferon, recombinant alpha-interferon, recombinant gamma-interferon, or no interferon.
• Interferon synthesis was induced by exposing treated cells to measles virus.
• Interferon levels in cell supernatants were quantified to assess cellular reactivity and priming.

Main Results:

• Leukocytes from MS patients produced significantly less interferon when untreated compared to normal controls.
• Upon priming with alpha-interferon (natural or recombinant), MS patient leukocytes demonstrated a 10-11 fold increase in interferon synthesis, similar to controls.
• Priming with recombinant gamma-interferon resulted in a 3.6-fold increase in interferon synthesis by MS patient leukocytes, indicating responsiveness.
• These findings confirm leukocyte reactivity to alpha-interferon and demonstrate responsiveness to gamma-interferon in MS patients.

Conclusions:

• Leukocytes from multiple sclerosis patients exhibit impaired spontaneous interferon production.
• Despite reduced baseline production, MS patient leukocytes are effectively primed by both alpha- and gamma-interferons.
• This study demonstrates functional responsiveness of MS leukocytes to gamma-interferon, a novel finding.