16F16 is a protein disulfide isomerase (PDI) inhibitor.1It inhibits PDI reductase activity in an enzyme assay when used at concentrations ranging from 1 to 100 μg/ml.116F16 reduces PC12 cell apoptosis induced by the misfolded huntingtin protein HTTQ103. It suppresses PDI-dependent mitochondrial outer membrane permeabilization (MOMP) in isolated PC12 cell mitochondria. 16F16 (2, 3, 4, and 10 μM) reduces HTTN90Q73mutant huntingtin-induced medium spinal neuron death and MOMP in rat corticostriatal slices. It also reduces pyramidal neuron death induced by amyloid-β precursor protein (APP) in rat corticostriatal slices. 1.Hoffstrom, B.G., Kaplan, A., Letso, R., et al.Inhibitors of protein disulfide isomerase suppress apoptosis induced by misfolded proteinsNat. Chem. Biol.6(12)900-906(2010)
Chloroguanabenz is an antiprion agent and a derivative of the α2-adrenergic receptor agonist guanabenz . It inhibits prion formation in yeast and mammalian cell-based assays. Chloroguanabenz reduces the levels of both soluble and aggregated forms of the truncated Huntingtin derivative Htt48 in an HEK293T cellular model of Huntington's disease.
C2-8 is an inhibitor of polyglutamine (polyQ) aggregation (IC50s = 25 and 0.05 μM for recombinant HDQ51 and in PC12 cells, respectively). It also inhibits polyQ aggregation in organotypic hippocampal slice cultures isolated from R6 2 transgenic mice and reduces neurodegeneration in a dose-dependent manner in a Drosophila model of Huntington's disease. C2-8 (100 and 200 mg kg) reduces huntingtin aggregate size, reduces neuronal atrophy, and improves motor performance in a rotarod test in the R6 2 transgenic mouse model of Huntington's disease.
Meclocycline is a tetracycline antibiotic with broad antimicrobial activity. Meclocycline inhibits lactate dehydrogenase (LDH) release and cell toxicity induced by expression of htt-N63-148Q, a mutant form of the huntingtin gene, without altering htt-N63-148Q protein levels in PC12 cells.