Biochemistry, Pre-Med co-major, Neurosciance Minor
Graduate Student,Chemistry and Biochemistry Department
Assistant Professor, Chemistry and Biochemistry Department
Figure 1. Graphical abstract showing Ligand-Directed Nitrophenol Carbonate
Chemotherapy is regarded as one of the most common cancer treatments but fails in almost 90% of cases due to acquired resistance against anti-cancer drugs (1). The development of Multi-Drug Resistance (MDR) is a common limitation in all cancer treatment modalities however (1). Immunotherapy is a promising pathway in MDR cancer treatment for its ability to boost the body’s own immune system to attack and destroy cancer cells. Proximity-accelerated chemistry is a strategy used to speed up chemical reactions when the reactants are held in close proximity. This technique has been modified to produce the Ligand-Directed Nitrophenol Carbonate (LDNPC) chemistry seen in Figure 1 (2). In this method, a chosen ligand is conjugated to a nitrophenol carbonate and self-immolative linker which is attached to the drug payload (2). As the ligand binds to the target, nucleophilic residues peripheral to the binding site attack the molecule (affinity labelling). The linker is subsequently hydrolyzed releasing the drug payload.
We hypothesize the synthesis of a LDNPC compound specific to the TNC receptor linked to the immunostimulant, imiquimod.
The synthetic scheme followed in this research was developed by Burt et al (2). In the original scheme, biotin was utilized to direct the ligand into binding with avidin. In the current project, a tumor-homing peptide, PL3, that binds the TNC receptor has been used instead. This receptor is commonly overexpressed in many tumor extracellular matrices including prostate cancer and glioblastomas (3).
We have currently synthesized I1, I2, I3, I5, and I6/C as well as characterized these molecules with NMR. We have also synthesized the PL3 peptide; its mass spectrum (molar mass: 884.06 g/mol) can be seen below.
We will synthesize I4 and conjugate it with I1 to form B followed by reaction with the peptide (A) and C to complete the whole reaction.
Next steps: completion of the synthesis, purification and characterization of the products,
Perform assays to determine proper release of the imiquimod upon LDNPC reagent binding
Research presented in this poster is supported by National Cancer Institute of the National Institute of Health under award number 1R01CA234115 to Dr. Rock Mancini. The opinions and/or findings expressed are those of the author and should not be interpreted as representing the official views or policies of the NIH or U.S. government.
1. Emran, T. B., Shahriar, A., Mahmud, A. R., Rahman, T., Abir, M. H., Siddiquee, Mohd. F. - R., Ahmed, H., Rahman, N., Nainu, F., Wahyudin, E., Mitra, S., Dhama, K., Habiballah, M. M., Haque, S., Islam, A., and Hassan, M. M. (2022) Multidrug Resistance in Cancer: Understanding Molecular Mechanisms, Immunoprevention and Therapeutic Approaches. Frontiers in Oncology. https://doi.org/10.3389/fonc.2022.891652
2. Burt, A. J., Parvaneh Ahmadvand, Opp, L. K., Ryan, A. T., Kang, C., and Mancini, R. J. (2020) A Ligand‐Directed Nitrophenol Carbonate for Transient in situ Bioconjugation and Drug Delivery. ChemMedChem. 15, 2004–2009
3. Lingasamy, P., Tobi, A., Kurm, K., Kopanchuk, S., Sudakov, A., Salumäe, M., Rätsep, T., Asser, T., Bjerkvig, R., and Teesalu, T. (2020) Tumor-penetrating peptide for systemic targeting of Tenascin-C. Scientific Reports. https://doi.org/10.1038/s41598-020-62760-y
4. Haroon, M., Sultana, S., Najibi, S. A., Wang, E. T., Michaelson, A., Al Muied, P. S. M., Nielsen, A. E., and Mancini, R. J. (2025) Efflux-Enhanced Imidazoquinolines To Exploit Chemoresistance. ACS Omega. 10, 12319–12333
Communication: Through this research, I have been able to learn and practice my communication skills. In any form of research, communication is a necessity in order to have effectice procedings in the lab, but especially when working under a graduate student and with other undergraduates, it's been vital for me to learn these skills. I have been able to effectively communicate questions, directions, results, and next steps, all of which contribute to effective research and results.
Teamwork: As I mentioned earlier, working in such a large lab has taught me how to work around and with others in a team to efficiently and effectively get my job done. I have also learned that working in a chemistry lab creates a lot of mess and waste, and that cleanup is not just a solo job, but something that everyone can participate in to help out and maintain the upkeep of the lab. Teamwork also involves collaboration and working with others to achieve a goal, which is something I have been witness to and participated in within the Mancini Lab.
Critical Thinking: Organic synthesis involves a great deal of critical thinking. With each experiment, even the same conditions could result in a different product or mixture of products. Working in this lab has taught me how to look at the reaction and what is occuring and try to figure out where it could've gone wrong or what could've affected the results. Chemistry is never perfect or clean, so this has bee a big challenge over the past few years for me, but it has also taught me so much about critical thinking.