This application continues the investigation of short chain fatty acid-N-acetylmannosamine (SCFA-ManNAc) analogs represented by the lead compound Bu4ManNAc. This hybrid molecule derives HDACi growth inhibitory activity from its n-butyrate (Bu) groups and increases metabolic flux through the sialic acid biosynthetic pathway due to ManNAc generated after complete removal of n-butyrate by esterases. During the initial funding period of this project, it was discovered that partial hydrolysis products of Bu4ManNAc (e.g., 3,4,6-O-Bu3ManNAc) have a third mode of activity that suppresses the invasive potential of metastatic breast cancer cells at subcytotoxic doses. Because of the largely unmet and urgent clinical need for anti-metastatic therapeutics, the second funding period will investigate the mechanism underlying this newly found anti-cancer activity by focusing on the ability of the analogs to inhibit NF-kB (Aim 1) and alter glycosylation (Aim 2);in tandem, the current emphasis on cell-based assays will be transitioned into animal-level testing (Aim 3). In more detail, Specific Aim 1 will investigate the hypothesis that novel anti-cancer properties of a subset of SCFA-ManNAc analogs are a consequence of NF-kB inhibition through (at least in part) direct binding to pathway elements such as NFKB1;an auxiliary purpose of this investigation is to discover or design more highly and efficacious analogs for animal testing.
In Specific Aim 2, mass spectrometry and bioinformatics strategies will be used to conduct a glycomics analysis of analog-treated cells;this work will provide a method for pharmacokinetic tracking of analog metabolism in vivo and will also shed mechanistic insights into the role of glycans in metastasis. Finally, Specific Aim 3 will transition this project into animal testing in rodents to determine oral availability, safety, pharmacokinetic properties and organ distribution, and efficacy in metastatic cancer models. Together, these experiments will substantially advance both the mechanistic and translational prospects for SCFA-ManNAc analogs, an emerging class of sugar-based cancer drug candidates.
The ultimate goal of this project is to develop a new class of sugar-based cancer drugs to treat metastatic cancer. Based on the current lack of effective therapeutic agents for virtually all types of highly malignant disease, combined with the hundreds of thousands of new cases of cancer annually, there is clearly an urgent public health need for the drug candidates under development. This project is designed to propel the testing of this emerging class of therapeutics from cell-based assays to rodent models, which will in turn set the stage for translation to clinical testing in humans.
|Sun, Shisheng; Shah, Punit; Eshghi, Shadi Toghi et al. (2016) Comprehensive analysis of protein glycosylation by solid-phase extraction of N-linked glycans and glycosite-containing peptides. Nat Biotechnol 34:84-8|
|Toghi Eshghi, Shadi; Yang, Weiming; Hu, Yingwei et al. (2016) Classification of Tandem Mass Spectra for Identification of N- and O-linked Glycopeptides. Sci Rep 6:37189|
|Yang, Weiming; Jackson, Brooks; Zhang, Hui (2016) Identification of glycoproteins associated with HIV latently infected cells using quantitative glycoproteomics. Proteomics 16:1872-80|
|Sun, Shisheng; Zhang, Hui (2015) Large-Scale Measurement of Absolute Protein Glycosylation Stoichiometry. Anal Chem 87:6479-82|
|Toghi Eshghi, Shadi; Shah, Punit; Yang, Weiming et al. (2015) GPQuest: A Spectral Library Matching Algorithm for Site-Specific Assignment of Tandem Mass Spectra to Intact N-glycopeptides. Anal Chem 87:5181-8|
|Sun, Shisheng; Zhang, Hui (2015) Identification and Validation of Atypical N-Glycosylation Sites. Anal Chem 87:11948-51|
|Saeui, Christopher T; Urias, Esteban; Liu, Lingshu et al. (2015) Metabolic glycoengineering bacteria for therapeutic, recombinant protein, and metabolite production applications. Glycoconj J 32:425-41|
|Badr, Haitham A; AlSadek, Dina M M; Mathew, Mohit P et al. (2015) Nutrient-deprived cancer cells preferentially use sialic acid to maintain cell surface glycosylation. Biomaterials 70:23-36|
|Shah, Punit; Zhang, Bai; Choi, Caitlin et al. (2015) Tissue proteomics using chemical immobilization and mass spectrometry. Anal Biochem 469:27-33|
|Mathew, Mohit P; Tan, Elaine; Saeui, Christopher T et al. (2015) Metabolic glycoengineering sensitizes drug-resistant pancreatic cancer cells to tyrosine kinase inhibitors erlotinib and gefitinib. Bioorg Med Chem Lett 25:1223-7|
Showing the most recent 10 out of 41 publications