Research

Organic / medicinal chemistry and chemical biology

The research group of Prof. Blake R. Peterson at Ohio State uses synthetic organic chemistry and chemical biology to investigate and control proteins that drive the proliferation of cancer cells and other biological systems. Our research is associated with the Pelotonia Institute of Immuno-Oncology (PIIO) and the Center for Cancer Engineering (CCE-CURES) of the OSU Comprehensive Cancer Center.

PIIO: https://cancer.osu.edu/for-cancer-researchers/research/research-institutes-and-centers/pelotonia-institute-for-immuno-oncology

CCE-CURES: https://cancer.osu.edu/for-cancer-researchers/research/research-institutes-and-centers/center-for-cancer-engineering

To discover new types of anticancer agents, and explore their mechanisms of action, we conduct interdisciplinary research in the fields of bioorganic / medicinal chemistry and chemical biology. Our primary approach involves the synthesis of small molecule probes, studies of their cellular and subcellular activities, and the identification and characterization of their protein targets. We have extensive expertise in the synthesis of chemical probes derived from steroids, lipids, nucleosides, peptides, heterocycles, fluorophores, and protein conjugates, and we evaluate these compounds in whole cell and biochemical assays. We further collaborate with other investigators to evaluate biologically active small molecules in vivo in animal models.

For some projects, we use high throughput and high content screening technologies available through the OSU Medicinal Chemistry Shared Resource (MCSR) High Throughput Screening Core (MCSR-HTSC) to identify starting points for the development of chemical probes and drug candidates.

MCSR: https://cancer.osu.edu/for-cancer-researchers/resources-for-cancer-researchers/shared-resources/medicinal-chemistry

MCSR-HTSC: https://u.osu.edu/highthroughputscreeningcore/

Our overarching scientific goals are to identify new therapeutic approaches and mechanisms. Two current research interests are described below.

 


Subcellular targeting for anticancer and phenotypic drug discovery

Modern research in the pharmaceutical industry emphasizes molecular and cellular targeting as a strategy to improve the therapeutic index of anticancer agents. However, drug targets reside in specific subcellular locations, and the design of agents that might gain additional potency and selectivity by accumulating in specific subcellular compartments is relatively unexplored. We investigate small molecules that accumulate in specific organelles such as the endoplasmic reticulum to target receptors sequestered in these specific cellular compartments (Angew. Chem. Int. Ed. 2015, 54, 9696-9699). We have also used this approach to develop sensitive sensors of biological processes such as activation of macrophages (ACS Chem. Biol. 2018, 13, 2595-2602), which of substantial interest in immuno-oncology. We are additionally investigating the combination of cellular targeting agents with compounds that disrupt membranes to create new types of synergistic anticancer agents (ACS Omega 2019, 7, 12955-12968). We are currently using subcellular-localized fluorescent probes in phenotypic high throughput and high content screening campaigns to identify small molecules with anticancer activity. Hits identified through this approach can be used to identify new protein targets for cancer drug discovery.


Synthetic molecular probes of cancer biology and other biological systems

We synthesize novel fluorescent molecular probes for drug discovery and as tools to explore mechanisms of action of biologically active compounds. Some of our early work in this area included the synthesis of Pennsylvania Green (Org. Lett. 2006, 8, 581-584) and biologically-active derivatives. More recently, we developed an efficient scalable synthesis of the coumarin Pacific Blue for studies of small molecule-protein interactions (ACS Omega 2016, 1, 1266-1276). This small and relatively drug-like fluorophore can be readily analyzed in living cells by confocal microscopy and flow cytometry. We use these fluorescence-based techniques to investigate derivatives of anticancer agents (Angew. Chem. Int. Ed. 2017, 36, 6927-6931) and explore associated biological processes. We have used this approach to develop molecular probes of microtubules that allow the discovery of new types of microtubule-binding agents in living cells (ACS Bio Med Chem Au, 2022, 2, 529-537). Our goal is to maximize the physiological relevance of assays used for drug discovery, and we are currently applying this approach to discover novel modulators of kinases, transporters, and epigenetic regulators involved in cancer.