( nerative disorder of the CNS causing p...)Data to be presented at AAN Meeting -Study results of drug,candidate for MS,Health

nerative disorder of the CNS, causing problems with muscle control and strength, vision, balance, sensation and mental function. MS typically presents in relapsing forms involving acute self-limiting attacks of neurological dysfunction (or "relapses") followed by complete or partial restoration of functions.

Preclinical studies

FTY720's previously known activity is based on its ability to bind to the sphingosine 1-phosphate receptor-1 (S1P-R1) on circulating lymphocytes (white blood cells). This activity reversibly traps a proportion of lymphocytes in the lymph nodes, reducing the number of inflammatory T-cells circulating in the bloodstream and in the CNS.

One of the preclinical studies presented at AAN evaluated FTY720's ability to activate S1P receptors on astrocytes in cell culture. Astrocytes are known to play an active role in nervous tissue repair, and to regulate the permeability of the blood brain barrier. The study findings indicate that FTY720 activates S1P receptors on astrocytes, stimulating intracellular pathways that regulate a variety of functions, such as cell proliferation and migration. (Muellershausen et al)

A second study, also conducted in cell culture, demonstrated that FTY720 improved the survival and increased the number of immature and mature oligodendrocytes - cells that help form myelin in the CNS. Stimulation of S1P receptors on oligodendrocytes may help limit demyelination and/or promote myelin repair. (Barske et al)

In the third study, conducted in an established animal model of MS [experimental autoimmune encephalomyelitis (EAE) in rats], researchers found that FTY720 directly administered in the rat brain significantly suppressed the severity of clinical EAE, suggesting additional mechanisms of action independent of lymphocyte depletion. In imaging studies, enhanced myelination and axonal protection associated with the clinical effects were confirmed in animals receiving oral FTY720. (Schubart et al
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