HDAC8 Inhibitor

Bavarostat (EKZ-001) is a blood-brain barrier-permeable, potent HDAC6 inhibitor and PET radiotracer, with an IC₅₀ as low as 17 nM against human HDAC6. Bavarostat can be labeled with ¹⁸F and used as a probe to map HDAC6 distribution and measure target occupancy in the brains of non-human primates. Bavarostat also selectively modulates tubulin acetylation, but not histone acetylation. Bavarostat is applicable for research on Alzheimer's disease, other neurodegenerative disorders, and cancers.

Imofinostat (ABT-301; MPT0E028) is an orally active and selective HDAC inhibitor with IC₅₀s of 53.0 nM, 106.2 nM, 29.5 nM for HDAC1, HDAC2 and HDAC6, respectively. Imofinostat has a weak inhibitory effect on HDAC8 (IC₅₀ of 2.5 ​​μM), but no inhibitory effect on HDAC4 (IC₅₀>10 μM). Imofinostat reduces the viability of B-cell lymphomas by inducing apoptosis and possesses potent direct Akt targeting ability and reduces Akt phosphorylation in B-cell lymphoma. Imofinostat has a broad-spectrum antitumor activity, including colorectal cancer, B-cell lymphoma, non-small cell lung carcinoma (NSCLC), and pancreatic cancer, while also showing therapeutic potential in non-tumor diseases like emphysema and pulmonary fibrosis.

WT-161 is a potent and selective HDAC6 inhibitor with an IC₅₀ of 0.40 nM. WT-161 also inhibits metallo-β-lactamase domain-containing protein 2 (MBLAC2).

HDAC11-IN-2 (compound B6) is a high selective Histone Deacetylase 11 (HDAC11) inhibitor. HDAC11-IN-2 inhibits HDAC11 and HDAC8 with IC₅₀s of 51.1 ×10^-3 μM and 5 μM, respectively. HDAC11-IN-2 inhibits denovolipogenesis (DNL) and promotes fatty acid oxidation, thus mitigating hepaticlipid accumulation and pathological symptoms in MASLD mice. HDAC11-IN-2 enhances the phosphorylation of AMPKα1 at Thr172 through the inhibition of HDAC11, consequently modulating DNL and fatty acid oxidation in the liver.

Puzerinostat (Purinostat) is a highly selective class I/IIb histone deacetylase (HDAC) inhibitor, with IC₅₀ values of 0.81 nM, 1.4 nM, 1.7 nM, 3.8 nM, 11.5 nM, and 1.1 nM against HDAC1, HDAC2, HDAC3, HDAC8, HDAC6, and HDAC10, respectively. Puzerinostat enhances glutamine metabolism by upregulating GLS1. Puzerinostat induces cell Apoptosis and downregulates the expression of BCR-ABL and c-MYC. Puzerinostat delays the progression of Ph⁺ B-cell acute lymphoblastic leukemia and prolongs the survival of relevant mouse models. Puzerinostat regulates the immune microenvironment. Puzerinostat can be used in research related to chronic myeloid leukemia, Philadelphia chromosome-positive B-cell acute lymphoblastic leukemia, relapsed/refractory multiple myeloma, relapsed/refractory lymphoma, diffuse large B-cell lymphoma, and double-expression lymphoma.

AES-135, a hydroxamic acid-based pan-HDAC inhibitor, prolongs survival in an orthotopic mouse model of pancreatic cancer. AES-135 inhibits HDAC3, HDAC6, HDAC8, and HDAC11 with IC₅₀s ranging from 190-1100 nM.

JNJ-16241199 (R306465) is an orally active, selectivehydroxamate-based histone deacetylase (HDAC) inhibitor, with theIC₅₀of 3.3 nM and 23 nM for HDAC1and HDAC8, respectively.JNJ-16241199induces histone 3 acetylation and strongly increases the expression of p21^waf1, ^cip1 in A2780 ovarian carcinoma cells.JNJ-16241199 inducescell apoptosisand shows anticancer activityin a broad spectrum of human malignancies. JNJ-16241199 can be used for cancer study.

NKL 22 is a potent and selective inhibitor of histone deacetylases (HDAC), with IC₅₀ values of 199 and 69 nM for HDAC1 and HDAC3, respectively. NKL 22 can reverse abnormal expression of HD‑related genes and restore the levels of key genes including Ppp1r1b in Huntington's disease transgenic mice. NKL 22 can be used for the researches of Huntington's disease and cancer.

HPOB is a highly potent and selective inhibitor of HDAC6 with an IC₅₀ of 56 nM. HPOB displays >30 fold less potent against other HDACs. HPOB enhances the effectiveness of DNA-damaging anticancer agents in transformed cells but not normal cells. HPOB does not block the ubiquitin-binding activity of HDAC6.

SIRT6-IN-3 (compound 8a) is a selective inhibitor of SIRT6 (IC₅₀=7.49 μM). SIRT6-IN-3 inhibits pancreatic ductal adenocarcinoma (PDAC) cells proliferation and induces apoptosis. SIRT6-IN-3 increases the sensitivity of cancer cells to gemcitabine (HY-17026) via blocking the DNA damage repair pathway. SIRT6-IN-3 is used in pancreatic cancer research.

BRD73954 is a potent HDAC inhibitor and selectively inhibiting both HDAC6 and HDAC8 with IC₅₀ values of 0.0036, 0.12, 9, 12, 23 µM for HDAC6, HDAC8, HDAC2, HDAC1 and HDAC3, respectively. BRD73954 decreases the levels of HDAC6, associated with upregulation of Ac-Tubulin.

MC1742 is a potent HDAC inhibitor, with IC₅₀s of 0.1 μM, 0.11 μM, 0.02 μM, 0.007 μM, 0.61 μM, 0.04 μM and 0.1 μM for HDAC1, HDAC2, HDAC3, HDAC6, HDAC8, HDAC10 and HDAC11, respectively. MC1742 can increase acetyl-H3 and acetyl-tubulin levels and inhibits cancer stem cells growth. MC1742 can induce growth arrest, apoptosis, and differentiation in sarcoma CSC.

SelSA is a selective, orally active inhibitor for histone deacetylase 6 (HDAC6) with IC₅₀ of 56.9 nM. SelSA inhibits the phosphorylation of ERK1/2. SelSA inhibits the proliferation of breast cancer cells and hepatocellular carcinoma cells with IC₅₀ of 0.58-2.6 μM, inhibits cell migration and invasion of Huh7, and induces apoptosis. SelSA exhibits antitumor activity in mouse model.

JAK/HDAC-IN-1 is a potent JAK2/HDAC dual inhibitor, exhibits antiproliferative and proapoptotic activities in several hematological cell lines. JAK/HDAC-IN-1 shows IC₅₀s of 4 and 2 nM for JAK2 and HDAC, respectively.

FNDR-20123 is a safe, first-in-class, and orally active anti-malarial HDAC inhibitor with IC₅₀s of 31 nM and 3 nM for Plasmodium and human HDAC, respectively. FNDR-20123 exerts anti-malarial activity against Plasmodium falciparum asexual stage (IC₅₀=41 nM) and sexual blood stage (IC₅₀=190 nM for male gametocytes). FNDR-20123 inhibits HDAC1, HDAC2, HDAC3, HDAC6, and HDAC8 (IC₅₀=25/29/2/11/282 nM, respectively.) and inhibits Class III HDAC isoforms at nanomolar concentrations.

HDAC10-IN-3 (Compound 2a) is a potent HDAC10 inhibitor with an IC₅₀s of 0.41, 37, 350 and 4500 nM against HDAC10, HDAC6, HDAC8 and HDAC1. HDAC10-IN-3 exhibits moderate cytotoxicity in KB and SK-OV-3 cells, but does not show significant cytotoxicity against most cancer cell lines. HDAC10-IN-3 can be used for the study of cancers.

HDAC8-IN-8 (15a) is an HDAC8 inhibitor, with IC₅₀ values of 23.9 μM and 268.2 μM for hHDAC8 and smHDAC8 respectively. And for hHDAC1 and hHDAC6, the IC₅₀ values are 12.1 μM and 2.9 μM respectively. HDAC8-IN-8 can be used in schistosomiasis-related research.

HDAC4-IN-1 (compound 1a) is a class IIa HDACI inhibitor (IC₅₀=0.077 μM). HDAC4-IN-1 can enhance Caspase-induced Apoptosis. HDAC4-IN-1 has anticancer activity. HDAC4-IN-1 can be used in the research of drug combination against cancer.

HDAC-IN-40 is a potent alkoxyamide-based HDAC inhibitor with K_i values of 60 nM and 30 nM for HDAC2 and HDAC6, respectively. HDAC-IN-40 had antitumor effects.