The Lankenau Institute for Medical Research
Association: Resident Faculty
Selected Awards and Honors
By studying disease modifier genes we seek to develop new principles to treat cancer, diabetes, autoimmune disorders and cardiovascular disease. Currently most biomedical research focuses on understanding disease pathways. We seek to understand general disease modifier pathways that determine disease severity, an understudied area from which many useful drugs such as NSAIDs and statins are based. A major thrust of our present work focuses on modifiers of inflammatory processes which contribute significantly to the severity of many age-associated diseases. In our main project, we have developed a new class of drugs that recruit the immune system to eradicate a broad spectrum of advanced cancers, including breast, lung, skin, and pancreas tumors that are often refractory to chemotherapy. These drugs, called IDO inhibitors, are presently in Phase II clinical trials. In other projects, with our Lankenau colleagues we are developing new agents to treat autoimmune disorders, reduce risks of cardiovascular disease, and ameliorate diabetes.
Our laboratory is interested primarily in cancer genes, cancer immunology and molecular therapeutics. We use transgenic mouse models and preclinical drug strategies to learn new ways to suppress cancer, focusing on long-term goals of improving strategies for cancer prognosis and treatment.
Localized tumors are often curable if they are detected before progression to invasive status, but many patients diagnosed with cancer already have invasive disease. What factors dictate malignant progression and how might they be therapeutically exploited? Molecular therapeutics that target key oncogene and tumor suppressor pathways show some clinical promise, but they have shown limited efficacy to date. Cancer modifier pathways that influence the immune microenvironment of tumor cells may strongly influence clinical course. Accordingly, new therapies we are developing are based on blocking enzymes that limit the ability of immune cells to destroy cancer cells or drive disease.
RhoB studies derive from our long-standing research on this member of the Ras/Rho superfamily in cancer cell signaling. Recent work in collaboration with Drs. Lisa Laury-Kleintop and Laura Mandik-Nayak at Lankenau has opened exciting new directions in studies of the role of RhoB in autoimmune and cardiovascular disease. A start-up company has been created to fund and advance the preclinical and clinical work needed to explore a provocative new therapy emerging from these novel directions, which in principle may be useful to treat one or more diseases in important areas of medicine.
Bin1 studies originating in cancer cell studies led us to discover that it regulates the immune modulatory enzyme indoleamine 2,3-dioxygenase (IDO). Bin1 modifies inflammation in a variety of settings including cancer. Recently, in preclinical studies we found that its genetic blockade can limit the development of inflammatory bowel disease (colitis). Based on this finding, we are now investigating the use of Bin1 antibodies we have developed to treat this disorder.
IDO is a tryptophan catabolic enzyme that blocks T cell activation in physiological settings such as pregnancy and in many pathophysiological settings like cancer. IDO is very widely activated as a mechanism of immune escape by cancer cells. Genetic studies reveal that IDO is essential for inflammation-driven cancers, not only supporting immune escape but also angiogenesis and metastasis. We pioneered preclinical studies of IDO inhibitory drugs that can arrest tumor growth and enhance chemotherapeutic efficacy. Mechanistic studies of one clinical lead inhibitor, D-1MT (indoximod), will greatly assist ongoing Phase II studies of this drug. Translational studies including on an IDO-related gene called IDO2 discovered at Lankenau are currently a major focus of the laboratory.
Dr. Prendergast's Google Scholar page
(from 145 peer-reviewed papers and 75 books, book chapters, or reviews):