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Overview
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Background
CBR-5884 is a selective inhibitor of 3-phosphoglycerate dehydrogenase (PHGDH) with IC50 of 7 μM. PHGDH catalyzes the first committed step of serine biosynthesis, is overexpressed in tumors and cancer cell lines via focal amplification and nuclear factor erythroid-2-related factor 2 (NRF2)-mediated up-regulation. So CBR-5884 can inhibit de novo serine synthesis in cancer cells.
CBR5884 selectively inhibits the proliferation of breast and melanoma cancer lines that have a high propensity for serine synthesis but has no effect on lines that rely on extracellular serine uptake. CBR-5884 is a noncompetitive and time-dependent inhibitor of PHGDH and disrupts its oligomerization state. The dose at which CBR-5884 has an effect on serine labeling was consistent with the in vitro biochemical IC50 of 33 ± 12 μM for PHGDH. At such concentrations, CBR-5884 has no effect on two other NAD+-dependent dehydrogenases, lactate dehydrogenase (LDH) and MDH1. The Ki value are 50 ± 20 μM and 50 ± 3 μM for 3-PG and NAD+, respectively. CBR-5884 is not generally cytotoxic at concentrations up to 40 μM as determined by two independent cellular viability assays. Treating the breast lines with CBR-5884 in serine-replete media inhibited growth of the four lines that grew without extracellular serine in a dose-dependent manner, with growth inhibition ranging from 35% to 60% at 30 μM CBR-5884. Serine depletion increases the efficacy of CBR-5884 in lines already sensitive under serine-replete conditions as evidenced by an 80–90% decrease in proliferation with 30 μM CBR-5884. [1]
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