Abstract
Background: Cancer of the skin is by far the most common of all cancers. Melanoma accounts for only about 1% of skin cancers but causes a large majority of skin cancer deaths. Autotaxin (ATX), also known as ectonucleotide pyrophosphatase/phosphodiesterase 2 (ENPP2), regulates physiological and pathological functions of lysophosphatidic acid (LPA), and is thus an important therapeutic target.
Methods: We synthesized ten metal-based complexes and a novel cyclometalated rhodium(III) complex 1 was identified as an ATX enzymatic inhibitor using multiple methods, including ATX enzymatic assay, thermal shift assay, western immunoblotting and so on.
Results: Protein thermal shift assays showed that 1 increased the melting temperature (Tm) of ATX by 3.5 °C. 1 also reduced ATX-LPA mediated downstream survival signal pathway proteins such as ERK and AKT, and inhibited the activation of the transcription factor nuclear factor κB (NF-κB) and signal transducer and activator of transcription 3 (STAT3). 1 also exhibited strong anti-proliferative activity against A2058 melanoma cells (IC50 = 0.58 μM). Structure-activity relationship indicated that both the rhodium(III) center and the auxiliary ligands of complex 1 are important for bioactivity.
Conclusions: 1 represents a promising scaffold for the development of small-molecule ATX inhibitors for anti-tumor applications. To our knowledge, complex 1 is the first metal-based ATX inhibitor reported to date.
General significance: Rhodium complexes will have the increased attention in therapeutic and bioanalytical applications.
Original language | English |
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Pages (from-to) | 256-263 |
Number of pages | 8 |
Journal | Biochimica et Biophysica Acta - General Subjects |
Volume | 1861 |
Issue number | 2 |
Early online date | 23 Nov 2016 |
DOIs | |
Publication status | Published - Feb 2017 |
Scopus Subject Areas
- Biophysics
- Biochemistry
- Molecular Biology
User-Defined Keywords
- Anticancer
- Autotaxin
- Inhibitor
- Melanoma
- Rhodium complex