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Institut National de la Santé et de la Recherche Médical,
*
Unité 25 and
Unité 345, Necker Hospital, Paris, France; and
Sanofi-Synthelabo, Bagneux, France
Converging evidence that G-CSF, the hemopoietic growth factor of
the myeloid lineage, also exerts anti-inflammatory and pro-Th2
effects, prompted us to evaluate its direct therapeutic potential in
autoimmune diseases. Here we report a novel activity of G-CSF in
experimental allergic encephalomyelitis, a murine model for multiple
sclerosis, driven by Th1-oriented autoaggressive cells. A short 7-day
treatment with G-CSF, initiated at the onset of clinical signs,
provided durable protection from experimental autoimmune
encephalomyelitis. G-CSF-treated mice displayed limited demyelination,
reduced recruitment of T cells to the CNS, and very discrete autoimmune
inflammation, as well as barely detectable CNS mRNA levels of cytokines
and chemokines. In the periphery, G-CSF treatment triggered an
imbalance in the production by macrophages as well as autoreactive
splenocytes of macrophage inflammatory protein-1
and monocyte
chemoattractant protein-1, the prototypical pro-Th1 and pro-Th2 CC
chemokines, respectively. This chemokine imbalance was associated with
an immune deviation of the autoreactive response, with reduced IFN-
and increased IL-4 and TGF-
1 levels. Moreover, G-CSF limited the
production of TNF-
, a cytokine also associated with early CNS
infiltration and neurological deficit. These findings support the
potential application of G-CSF in the treatment of human autoimmune
diseases such as multiple sclerosis, taking advantage of the wide
clinical favorable experience with this
molecule.
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