KAHR-102 is a fusion protein that links portions of two immune and cancer-related membrane proteins; CTLA-4 and FasL (Company Pipeline, KAHR Medical, APR 14, 2016, View Source [SID:1234510828]).

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The functions of KAHR-102 in immune settings are anticipated from its component parts; The CTLA-4 component of KAHR-102 binds to B7 costimulators on antigen-presenting-cells (APC), such as dendritic cells, and thereby prevents them from engaging and triggering their cognate stimulatory CD28 receptor on T cells. The FasL component of the KAHR-102 fusion protein, binds to its cognate Fas receptor, which is upregulated on activated T cells, and thereby triggers apoptosis in these cells. The net effect of combining these blocking and triggering functions is to convert a T cell activating signal into an inhibitory one, leading to immune suppression.

KAHR-102 has also shown significant activity in cancer – both in-vitro and in cancer animal models. The CTLA-4 side of the drug targets to B7 receptors on lymphatic cancer cells, while the FasL side of the drug induces specific apoptosis of these cancer cells.

KAHR-102 forms a homo-hexamer which allows an optimal hexameric FasL structure to be specifically targeted to B7-expressing cells, such as in lymphoma cells.