Cyclosporin B, EvoPure is a dihydroxylated metabolite of cyclosporin A (CsA). Cyclosporin B (M-26) and other cyclosporin metabolites have been found to have lower (<10%) immunosuppressant activity than cyclosporin A (CsA). Cyclosporin B and other metabolites have been isolated and characterized but do not appear to have been extensively studied.

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CAS Number

63775-95-1

Molecular Formula

C₆₁H₁₀₉N₁₁O₁₂

Molecular Weight

1188.58 g/mol

Mechanism of Action

Cyclosporin B (and other cyclosporin A metabolites) have lower immunosuppressive activity but likely operate under the same mechanism as cyclosporin A described below. After entering a T-cell, Cyclosporin A associates with the cytosolic protein cyclophilin which helps in protein folding. Cyclosporin A binds to cyclophilins and this complex binds another cytosolic protein phosphatase called Calcineurin (protein phosphatase 2B) that dephosphorylates a transcription factor (nuclear factor of activated T-cells, or NF-AT) needed for expression of interleukin 2 (IL-2.). It also blocks the pathway to nitric oxide synthesis via tumor necrosis factor (TNFa) and Interleukin 1a. Cyclosporin A (CsA) immunosuppressant activity stems from its ability to prevent T-cell activation by blocking specific cytokine transcription genes. After entering a T-cell, cyclosporin A (CsA) associates with ubiquitous cytosolic proteins called cyclophilins which aid in protein folding. Cyclosporin A (CsA) : cyclophilin complexes together bind calcineurin, (another cytosolic protein) effectively blocking the pathway to IL-2 gene transcription and T-cell activation.

Storage Conditions

-20°C

Tariff Code

2933.79.8500

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