Hormonal and gender-related immune changes in multiple sclerosis

Area of Science:

• Neuroimmunology
• Endocrinology
• Autoimmune Diseases

Background:

• Multiple sclerosis (MS) exhibits a notable sex bias, being more prevalent in women, with rising incidence.
• Qualitative differences exist in MS progression between sexes, with men experiencing greater disease advancement, brain atrophy, and cognitive decline.
• Pregnancy typically reduces MS relapse rates, but postpartum periods see a surge in disease activity, potentially linked to hormonal shifts.

Purpose of the Study:

• To explore the reasons behind the sex bias observed in autoimmune diseases, particularly MS.
• To review pregnancy-related alterations in MS, including effects on disease activity, disability, and prevalence.
• To elucidate the hormonal and immunological mechanisms underlying these sex- and pregnancy-related MS phenomena.

Main Methods:

• This review synthesizes existing literature on sex differences in MS.
• It examines hormonal influences on immune responses and nervous system repair in MS.
• The review analyzes data on pregnancy's impact on MS disease course and activity.

Main Results:

• Hormones like estrogen, progesterone, and testosterone play a role in modulating MS pathology and immune responses.
• Abrupt drops in estrogen post-delivery and the cessation of pregnancy's immunosuppressive state likely contribute to increased postpartum MS activity.
• Hormonal factors are implicated in both the sex bias and pregnancy-related fluctuations in MS.

Conclusions:

• Hormonal insights are crucial for understanding and potentially treating MS.
• Understanding the interplay between hormones, immunity, and pregnancy is key to managing MS in women.
• Further research into hormonal mechanisms may reveal strategies for MS prevention and improved therapeutic interventions.