TPCA-1 is an orally active IKK-2 inhibitor with an IC50 of 17.9nM. TPCA-1 blocks IκBα phosphorylation by inhibiting IKK-2, thereby suppressing NF-κB nuclear translocation. TPCA-1 inhibits STAT3 phosphorylation and activation to suppress inflammation and tumor-related signaling. TPCA-1 can be used in studies of inflammatory diseases and tumors[1-4].
In vitro, treatment of HPAF-II cells with 8μM TPCA-1 for 48 hours reduced the protein expression of antiviral genes MxA and OAS. Treatment of HPAF-II, Hs766T, CFPAC-1, and HPAC cells with 8μM TPCA-1 for 48 hours followed by infection with VSV-ΔM51-GFP enhanced virus-mediated cell death[5]. Treatment of TNF-α-induced U87 cells with 2-16μM TPCA-1 for 2 hours inhibited RelA nuclear translocation. Pretreatment of U87 cells with 2-16μM TPCA-1 for 2 hours followed by treatment with 1000U/mL IFN-α for 48 hours attenuated the protective effect of cells against vesicular stomatitis virus-induced cytopathy and promoted viral replication[6]. Treatment of KYSE-150, KYSE-180, KYSE-450, and Het-1A cells with 0.5-4μM TPCA-1 for 2 days to 2 weeks induced apoptosis, inhibited IKKβ phosphorylation, stabilized IκBα, suppressed NF-κB signaling pathway, inhibited cell viability, and suppressed colony formation ability[7].
In vivo, a single intravenous injection of 200μg/kg TPCA-1 was given to chronic periodontitis model C57BL/6 mice. The treatment reduced mRNA levels of IL-6, TNF, and IL-1b in gingival tissue. A single intravenous injection of 200μg/kg TPCA-1 was given to wild-type chronic periodontitis model C57BL/6 mice. TPCA-1 reduced cementum-enamel junction to alveolar bone crest (CEJ-ABC) distance and decreased the expression of inflammatory factors in gingival tissue[8]. C57BL/6J mice were given 30-50mg/kg TPCA-1 by oral gavage once daily for 10 days. TPCA-1 reduced ethanol intake and preference[9]. C57BL/6 mice were given intraperitoneal injections of 10mg/kg TPCA-1 once daily for 30 days. TPCA-1 significantly increased the number of active young cells and significantly decreased the number of early senescent and late senescent cells in mammary CD49fhighEpCAMlow cells. TPCA-1 restored Bcl11b activity scores and inhibited senescence-related pathways including NF-kB, Jak-Stat, MAPK, and PI3K-Akt[10].
References:
[1] Bhatti FUR, Hasty KA, Cho H. Anti-inflammatory role of TPCA-1 encapsulated nanosomes in porcine chondrocytes against TNF-α stimulation. Inflammopharmacology. 2019 Oct;27(5):1011-1019.
[2] Wu B, Wang Z, Liu J, et al. Dual rectification of metabolism abnormality in pancreatic cancer by a programmed nanomedicine. Nat Commun. 2024 Dec 3;15:10526.
[3] Zhang C, Lin W, Gao J, et al. pH-Responsive Nanoparticles Targeted to Lungs for Improved Therapy of Acute Lung Inflammation/Injury. ACS Appl Mater Interfaces. 2019 May 08;11(18):16380-16390.
[4] Wang Z, Yang J, Yang Y, et al. Targeted and Combined TPCA-1-Gold Nanocage Therapy for In Vivo Treatment of Inflammatory Arthritis. AAPS PharmSciTech. 2020;21:298.
[5] Cataldi M, Shah NR, Feltz S, et al. Breaking Resistance of Pancreatic Cancer Cells to an Attenuated Vesicular Stomatitis Virus Through a Novel Activity of IKK inhibitor TPCA-1. Virology. 2015 Nov;485:340-54.
[6] Du Z, Whitt MA, Baumann J, et al. Inhibition of Type I Interferon-Mediated Antiviral Action in Human Glioma Cells by the IKK Inhibitors BMS-345541 and TPCA-1. J Interferon Cytokine Res. 2012 Aug;32(8):368-77.
[7] Li Z, Zou L, Xiao Z, et al. Transcriptome-based drug repositioning identifies TPCA-1 as a potential selective inhibitor of esophagus squamous carcinoma cell viability. Int J Mol Med. 2022;49(6):75.
[8] Wang B, Bai S, Wang J, et al. TPCA-1 negatively regulates inflammation mediated by NF-kB pathway in mouse chronic periodontitis model. Mol Oral Microbiol. 2021;00:1-10.
[9] Truitt JM, Blednov YA, Benavidez JM, et al. Inhibition of IKKβ Reduces Ethanol Consumption in C57BL/6J Mice. eNeuro. 2016 Sep/Oct;3(5):e0256-16.2016.
[10] Bai H, Liu X, Lin M, et al. Progressive senescence programs induce intrinsic vulnerability to aging-related female breast cancer. Nat Commun. 2024 Jun 17;15:5154.
















