Small Molecules Target the Interaction between Tissue Transglutaminase and Fibronectin.
Livia Elena SimaBakhtiyor YakubovSheng ZhangSalvatore CondelloArabela A GrigorescuNkechiyere G NwaniLan ChenGary E SchiltzConstandina ArvanitisZhong-Yin ZhangDaniela MateiPublished in: Molecular cancer therapeutics (2019)
Tissue transglutaminase (TG2) is a multifunctional protein with enzymatic, GTP-ase, and scaffold properties. TG2 interacts with fibronectin (FN) through its N-terminus domain, stabilizing integrin complexes, which regulate cell adhesion to the matrix. Through this mechanism, TG2 participates in key steps involved in metastasis in ovarian and other cancers. High-throughput screening identified several small molecule inhibitors (SMI) for the TG2/FN complex. Rational medicinal chemistry optimization of the hit compound (TG53) led to second-generation analogues (MT1-6). ELISA demonstrated that these analogues blocked TG2/FN interaction, and bio-layer interferometry (BLI) showed that the SMIs bound to TG2. The compounds also potently inhibited cancer cell adhesion to FN and decreased outside-in signaling mediated through the focal adhesion kinase. Blockade of TG2/FN interaction by the small molecules caused membrane ruffling, delaying the formation of stable focal contacts and mature adhesions points and disrupted organization of the actin cytoskeleton. In an in vivo model measuring intraperitoneal dissemination, MT4 and MT6 inhibited the adhesion of ovarian cancer cells to the peritoneum. Pretreatment with MT4 also sensitized ovarian cancer cells to paclitaxel. The data support continued optimization of the new class of SMIs that block the TG2/FN complex at the interface between cancer cells and the tumor niche.
Keyphrases
- cell adhesion
- small molecule
- drug delivery
- machine learning
- molecular docking
- mass spectrometry
- staphylococcus aureus
- protein protein
- binding protein
- deep learning
- papillary thyroid
- pseudomonas aeruginosa
- electronic health record
- young adults
- celiac disease
- tyrosine kinase
- artificial intelligence
- resting state
- cystic fibrosis
- biofilm formation
- functional connectivity