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SPX-101 is Stable In and Retains Function After Exposure to Cystic Fibrosis Sputum

The science team at Spyryx has recently published an open-access article in the Journal of Cystic Fibrosis, supporting the stability of SPX-101 in the protease-rich environment of cystic fibrosis airways. Here, we demonstrate SPLUNC1, the natural allosteric regulator of ENaC, is degraded by multiple proteases present in sputum of CF patients. SPX-101 is stable in CF sputum and after exposure, retains functionality to internalize ENaC, raise the apical hydration of CF cells, and promote the survival of a mouse model of CF. This is not the case for the natural sequence of the ENaC-regulatory fragment of SPLUNC1, which is rapidly degraded under the same conditions.

Read the full open-access article here: