dpp8

1G244 是DPP8 9的抑制剂，具有抗动脉粥样硬化和抗骨髓瘤作用的特性。1G244对DPP8和DPP9的IC50值分别为14和53 nM, DPP8和DPP9的Ki 值分别为0.9和4.2 nM

Anagliptin (SK-0403) hydrochloride 是一种有效的、高度选择性的、口服具有活力的二肽酰肽酶 4 (DPP-4) 抑制剂 (IC50: 3.8 nM)，对 DPP-8 (IC50: 68 nM) 和 DDP-9 (IC50: 60 nM) 的选择性相对较弱。

Anagliptin (SK-0403) 是一种选择性的二肽酰肽酶 4 抑制剂，IC50=3.8 nM，对 DPP-8 9 的选择性相对较弱，IC50分别为 68 和 60 nM。

Talabostat (PT100, Val-boroPro) is a potent, nonselective and orally available dipeptidyl peptidase IV (DPP-IV) inhibitor with a Ki of 0.18 nM. Talabostat is a nonselective DPP-IV inhibitor, inhibiting DPP8 9, FAP, DPP2 and some other DASH family enzymes essentially as potently as it inhibits DPP-IV[1]. Talabostat stimulates the immune system by triggering a proinflammatory form of cell death in monocytes and macrophages known as pyroptosis. The inhibition of two serine proteases, DPP8 and DPP9, activates the proprotein form of caspase-1 independent of the inflammasome adaptor ASC[2]. Talabostat competitively inhibits the dipeptidyl peptidase (DPP) activity of FAP and CD26 DPP-IV, and there is a high-affinity interaction with the catalytic site due to the formation of a complex between Ser630 624 and the boron of talabostat[3]. Talabostat can stimulate immune responses against tumors involving both the innate and adaptive branches of the immune system. In WEHI 164 fibrosarcoma and EL4 and A20 2J lymphoma models, PT-100 causes regression and rejection of tumors. The antitumor effect appears to involve tumor-specific CTL and protective immunological memory. Talabostat treatment of WEHI 164-inoculated mice increases mRNA expression of cytokines and chemokines known to promote T-cell priming and chemoattraction of T cells and innate effector cells[3]. Talabostat treated mice show significant less fibrosis and FAP expression is reduced. Upon PT100 treatment, significant differences in the MMP-12, MIP-1α, and MCP-3 mRNA expression levels in the lungs are also observed. Treatment with PT100 in this murine model of pulmonary fibrosis has an anti-fibro-proliferative effect and increases macrophage activation[4]. [1]. Connolly BA, et al. Dipeptide boronic acid inhibitors of dipeptidyl peptidase IV: determinants of potencyand in vivo efficacy and safety. J Med Chem. 2008 Oct 9;51(19):6005-13. [2]. Okondo MC, et al. DPP8 and DPP9 inhibition induces pro-caspase-1-dependent monocyte and macrophage pyroptosis. Nat Chem Biol. 2017 Jan;13(1):46-53. [3]. Adams S, et al. PT-100, a small molecule dipeptidyl peptidase inhibitor, has potent antitumor effects and augments antibody-mediated cytotoxicity via a novel immune mechanism. Cancer Res. 2004 Aug 1;64(15):5471-80. [4]. Egger C, et al. Effects of the fibroblast activation protein inhibitor, PT100, in a murine model of pulmonary fibrosis. Eur J Pharmacol. 2017 Aug 15;809:64-72.

Talabostat mesylate (PT100) 是一种具有口服活性和非选择性的二肽基肽酶 IV 抑制剂(IC50< 4 nM;Ki= 0.18 nM)。Talabostat mesylate 是成纤维细胞活化蛋白的第一个临床抑制剂(IC50= 560 nM)，抑制 DPP8 9 (IC50= 4 11 nM;Ki= 1.5 0.76 nM)，静息细胞脯氨酸二肽酶(IC50= 310 nM)、DPP2 和一些其他 DASH 家族酶。Talabostat mesylate 具有抗肿瘤和造血刺激活性 。

DBPR108是新型、具有口服活性、选择性的DPP4抑制剂，IC50=为15nM，对DPP8和DPP9基本无抑制。

ICeD-2 是一种细胞死亡诱导剂，可诱导HIV-1感染的细胞死亡。 ICeD-2 介导的HIV-1感染细胞杀伤依赖于HIV-1蛋白酶活性。ICeD-2 可有效阻断二肽基肽酶DPP8和DPP9对 Gly-Pro-AMC 的水解。ICeD-2 显示 PBMC 中 DPP9 的强稳定性。