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Abstract
The SPRY domain-containing SOCS box protein-2 (SPSB2) plays a critical role in the degradation of inducible nitric oxide synthase (iNOS) in macrophages. In this study, we have conjugated a peptide inhibitor of the iNOS-SPSB2 interaction with a cell-penetrating peptide (CPP) for delivery into macrophages, and confirmed its binding to SPSB2. We have assessed the uptake of a fluorophore-tagged analogue by RAW 264.7 and immortalised bone marrow derived macrophage (iBMDM) cell lines, and shown that the CPP-peptide conjugate enhanced NO production. The findings of this study will be useful in further refinement of CPP-peptide conjugates as leads in the development of new antibiotics that target the host innate immune response.
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