PAR synthesis

TH5427 is a promising, targeted inhibitor that can be used to further study NUDT5 activity and ADP-ribose metabolism. TH5427, blocks progestin-dependent, PAR-derived nuclear ATP synthesis and subsequent chromatin remodeling, gene regulation and proliferation in breast cancer cells. NUDT5 is recently identified as a rheostat of hormone-dependent gene regulation and proliferation in breast cancer cells .

TH5427 hydrochloride is a NUDT5 inhibitor with a human target IC₅₀ of 29 nM, ~690-fold selectivity over MTH1 in vitro, and selective functional inhibition over other NUDIX hydrolases including NUDT9 .TH5427 hydrochloride binds to the active site of NUDT5, blocking enzymatic activity related to ADP-ribose metabolism and PAR-derived ATP synthesis .TH5427 hydrochloride blocks progestin-dependent nuclear ATP synthesis, impairs progestin-induced chromatin remodeling, inhibits histone H1 displacement, disrupts progestin-dependent gene regulation, and abrogates progestin-dependent proliferation in breast cancer cells .TH5427 hydrochloride functions as a versatile probe to study nuclear ATP dynamics and ADP-ribose-related metabolism in cells .TH5427 hydrochloride engages NUDT5 at physiological temperatures, as demonstrated by Drug Affinity Responsive Target Stability (DARTS) assay .TH5427 hydrochloride stabilizes NUDT5 against thermal denaturation in cell lysates and intact cells, as shown by cellular thermal shift assay (CETSA) .TH5427 hydrochloride functionally inhibits NUDT5 activity, leading to downstream effects on oxidative DNA damage and DNA replication in triple-negative breast cancer (TNBC) cells .TH5427 hydrochloride suppresses proliferation of TNBC cells without inducing cell death or apoptosis, slows DNA replication in TNBC cells, promotes accumulation of oxidative DNA lesions, and triggers DNA damage response in TNBC cells .TH5427 hydrochloride suppresses growth of TNBC cells in vitro, inhibits growth of TNBC xenograft tumors in nude mice in vivo, and shows greater potency against TNBC cell lines compared to ER-positive and normal-like breast cell lines .TH5427 hydrochloride can be used for the research of breast cancer and triple-negative breast cancer .

LT-626 is a potent PARP inhibitor with an IC₅₀ of 1.60 nM. LT-626 inhibits cellular PAR synthesis with an EC₅₀ of 17.9 nM and shows enhanced cytotoxicity in colorectal cancer cells harboring MRE11 mutations. LT-626 exhibits synergistic effects with Cisplatin (HY-17394), Oxaliplatin (HY-17371), and SN-38 (HY-13704) in colorectal cancer cells. LT-626 can be used for colorectal research .

Alentemol hydrobromide (U-66444B) is a blood-brain barrier-permeable dopamine receptor D₁, D₂, D₃, and D₄ agonist. Alentemol hydrobromide inhibits dopamine release, reduces dopamine synthesis, regulates dopamine metabolism, suppresses the impulse activity of dopaminergic neurons, and decreases the impulse frequency of dopaminergic neurons in the substantia nigra pars compacta and ventral tegmental area. Alentemol hydrobromide is applicable to research related to schizophrenia .

Alentemol (U-66444B (free base)) is a blood-brain barrier-permeable dopamine receptor D₁, D₂, D₃, and D₄ agonist. Alentemol inhibits dopamine release, reduces dopamine synthesis, regulates dopamine metabolism, suppresses the impulse activity of dopaminergic neurons, and decreases the impulse frequency of dopaminergic neurons in the substantia nigra pars compacta and ventral tegmental area. Alentemol is applicable to research related to schizophrenia .