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Estrogen treatment induces a novel population of regulatory cells, which suppresses experimental autoimmune encephalomyelitis
Author(s) -
Matejuk Agata,
Bakke Antony C.,
Hopke Corwyn,
Dwyer Jami,
Vandenbark Arthur A.,
Offner Halina
Publication year - 2004
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/jnr.20145
Subject(s) - experimental autoimmune encephalomyelitis , immunology , multiple sclerosis , biology , autoimmune disease , estrogen , encephalomyelitis , antigen , population , demyelinating disease , cancer research , medicine , antibody , endocrinology , environmental health
Multiple sclerosis (MS) is a debilitating neurological disease characterized by a progressive loss of motor and sensory function, eventually leading to paralysis and death. The primary cause of neurological impairment is demyelination of the central nervous system (CNS) caused by an inflammatory autoimmune response. Previous studies have shown that the severity of MS is reduced during pregnancy, suggesting that the increased level of sex hormones may reduce the autoimmune response. Recently, we have shown that estrogen treatment confers protection from experimental autoimmune encephalomyelitis (EAE), which is an animal model for MS. However, the cellular basis of estrogen's action remains unknown. In the current study, we demonstrate that estrogen treatment led to the induction of a novel subpopulation of regulatory cells in spleen and CNS, which also occurs naturally in pregnant mice. These previously uncharacterized cells display a low level expression of CD45 (CD45 dim ) and no detectable expression of many cell surface markers related to TCR signaling, including CD3 and TCR. However, these cells retained expression of VLA‐4, an extracellular protein involved in cellular migration. Several lines of evidence suggest that these novel cells, defined as CD45 dim VLA‐4 + cells, may play a role in the protective effects of estrogen in EAE. Injection of purified CD45 dim VLA‐4 + cells conferred protection from spontaneous EAE (Sp‐EAE). In contrast, injection of CD45 high VLA‐4 + cells exacerbated the disease course. CD45 dim VLA‐4 + cells also suppressed antigen‐specific proliferation of primed lymphocytes in coculture. A better understanding of how CD45 dim VLA‐4 + cells suppress the harmful immune response of EAE may help in explaining the induction of immune tolerance during pregnancy and lead to novel therapeutic approaches to combat MS and other autoimmune diseases. © 2004 Wiley‐Liss, Inc.