V Scholar Archives - Page 3 of 60

Xin Cai, MD, PhD

Cancer must change its nutrient uptake to grow. Drugs blocking cancer’s use of nutrients have been the basis of cancer therapy. However, most of these drugs work by blocking the pathways that metabolites use. They exhibit significant toxicity since they also harm normal tissues. We are looking at metabolite-targeted therapies that are less toxic. We hope the therapy will be more specific and effective as well. We don’t seek to block metabolite pathways. Instead, we target the specific metabolites that change in the tumor microenvironment. We study and harness the power of our body’s metabolites as drugs. Our work has the potential to change how we target cancer, leading to less toxic and more effective drugs. Our work will also help to diagnose cancer.

Kathleen Mulvaney, PhD

To understand how genes change in cancer, our field has uncovered many gene mutations and deletions in patient tumors. However, we have not yet been able to create treatments that can combat many of these changes. This research proposal will test the potential for new combinations of medicines to treat tumors with a common gene many cancers need on for survival, PRMT5. A number of aggressive tumor types have PRMT5 as a drug target including lung cancer which remains the leading cause of cancer-related deaths in the U.S. and pancreatic cancer where >90% of patients with this disease will succumb to it. We need to make better medicines to treat these cancers.

We will test our ability to drug PRMT5 protein in lung tumors in combination with other new drug targets. This work will provide fundamental insights into mechanisms of PRMT5 function and reveal new strategies to treat an aggressive and deadly form of cancer. It is necessary that we test and design effective, rationale combination therapies in cancer. These efforts aim to effectively kill tumors and to avoid tumors coming back in the patient.

This work could lead to clinical trials in the future that would directly benefit cancer patients and their families. My goal is for our laboratory to contribute to mentoring young scientists and to improving cancer treatment for patients. This V scholar award will help me to achieve my goals by providing additional support, mentorship, and scientific exchanges.

Tae Kon Kim, MD, PhD

Funded by the V Foundation Sonoma Epicurean in honor of Dustin and Johanna Valette

Myelodysplastic syndrome (MDS) is a blood cancer in which the bone marrow is unable to make enough healthy blood cells, and patients are at risk of developing a more aggressive leukemia. Besides stem cell transplantation, there is only one treatment option that has been proven to be effective at extending life for patients with MDS. Unfortunately, this drug still often fails, leaving patients with no other options. Recently, a new idea to enhance the immune system’s ability to fight cancer has been developed and successfully applied to other types of cancer. These new treatments (called immune checkpoint inhibitors) help the immune system better recognize and attack cancer cells. However, these treatments do not work in MDS. Here we propose a new immune checkpoint protein, which is found at high levels in the bone marrow MDS patients. Using mice transplanted with human MDS cells, we will study whether this protein hinders the ability for the immune system to fight MDS and whether we can block this protein to treat MDS. This study will let us understand how MDS avoids the immune system and help us find new treatments to enhance the immune system, leading to better outcomes for patients with MDS.

Brandon Faubert, PhD

Funded with support from Hockey Fights Cancer powered by the V Foundation presented by AstraZeneca

Lung cancer is a deadly disease. This lethality is due, at least in part, to how often and how extensively these cells can spread throughout the body. My laboratory is working to understand what causes these cancer cells to spread and how they survive this process. By doing so, we hope to identify new ways to treat lung cancer.

We are interested in the nutrients cancer cells use to support growth and how these nutrients might help cancer cells spread. We are particularly interested in fats, or fatty acids. These complex nutrients play many different roles in cells, including helping to maintain cell structure, storing energy, and even acting as a method of communication with other cells. When we measured fatty acids in lung cancer, we saw that several fats and fatty acid pathways were different in tumors that spread throughout the body, compared to tumors that did not. In this study, we investigate how fatty acid metabolism supports aggressive cancer cells, and we will test whether blocking these fatty acid pathways can prevent lung cancer cells from spreading.

Defne Bayik, PhD

Funded in partnership with the Dolphins Cancer Challenge (DCC)

Glioblastoma (GBM) is the most frequent and deadly malignant brain tumor. Escape from the body’s immune response is a critical factor that makes GBM untreatable. One promising anti-GBM strategy is to augment the tumor-fighting capacity of immune cells. CD8+ T cells have the potential to kill tumors, but cancers make them not function properly. Strategies that aim to prevent this process have not been successful in GBM yet. We recently found that a molecule named dipeptidyl peptidase 4 (DPP-4) is present on dysfunctional T cells at high levels. Furthermore, we observed that DPP-4 prevents CD8+ T cells from killing tumors. In this application, we aim to determine how DPP-4 reprograms T cells to a nonfunctional state. DPP-4 inhibitors are commonly used by patients with diabetes. We seek to repurpose these drugs in combination with existing immune-activating strategies to improve T cell response against GBM. Collectively, these studies will define DPP-4 as a new treatment target in GBM.

Aram Modrek, MD, PhD

Funded with support from StacheStrong

Radio- and chemotherapy work by damaging the DNA of cancer cells, but malignant cancers, like glioblastoma, often regrow more resistant to therapy. Surprisingly, treated tumors don’t always have new mutations in their DNA, prompting the question: How did treatment change the tumor?

We believe that non-genetic chemical “scars” on DNA from therapy make cancer cells more aggressive. This theory is hard to study because radio- and chemotherapy cause random DNA damage. To overcome this, we developed an experimental system that creates DNA damage at precise locations, providing a clear map of the damage.

Our research shows that DNA damage leaves non-genetic changes in cancer cells’ blueprints, such as DNA methylation and changes in gene expression. We believe these non-genetic changes help cancer cells behave more aggressively and resist treatment. By understanding how these alterations occur, we aim to develop therapies that prevent cancer cells from adapting to treatment.

Brian Miller, MD, PhD

The immune system plays a crucial role in controlling cancer growth. Immunotherapies help fight cancer by boosting the body’s immune response against the tumor. However, many patients have tumors that either don’t respond or become resistant to these treatments. One reason for this resistance is that a type of immune cell called macrophages, which are found in the tumor, can shut down the immune response and stop it from killing cancer cells. Right now, we don’t have effective treatments to target these macrophages. Our research team has discovered a new weakness in these macrophages. By blocking a special protein they use, we can stop them from taking in folate (a type of vitamin), which leads to their death. We will use patient samples and a new mouse model we created to figure out why these macrophages need folate and how we can use this information to enhance the immune response against tumors. This could lead to new treatments that specifically kill macrophages in tumors, helping more cancer patients benefit from immunotherapy.

Gabriel Griffin, MD

Our lab works on finding new and better immunotherapies for cancer. To do this, we try to understand how cancer cells hide from the immune system. We also try to understand which proteins could be targeted with a drug to help the immune system find and kill cancer cells more effectively.

To accomplish this, we are studying ancient viruses that live in the DNA of all human cells. Usually, these viruses are kept quiet by “epigenetic repressors”. Our lab is studying how to turn on these viruses in cancer cells, with the goal of activating the immune system to kill the tumor.

We envision this approach leading to a new type of cancer therapy, which could be used in patients that don’t respond to standard immunotherapies.

Daniel Matson, MD, PhD

Funded by Constellation Brands Gold Network Distributors

Uterine serous carcinoma (USC) is a severe type of cancer that affects older women and is responsible for 40% of deaths from uterine cancer. Many women with USC have advanced cancer at diagnosis and must be treated with toxic chemotherapy and radiation. However, over half of women with this cancer initially only have a tumor in their uterus. Surgery can remove the tumor from the uterus. However, 1 in 4 women have their cancer return after surgery. Right now, doctors cannot identify which women will have their cancer return after surgery, and so usually all women receive toxic treatments after surgery to help prevent their cancer from coming back. If doctors could identify which women with this cancer will have their tumors come back after surgery, they could only give therapy to women who are likely to have their cancer return. At the same time, women who are not likely to have their cancer return could just be followed by their doctor and would not need toxic treatments. This would represent a major advancement. We have found a marker named GATA2 that can predict which women with this cancer will have their cancer return. Our proposal will figure out why this marker predicts cancer recurrence and support separate clinical trials to test whether we can spare many women with this cancer from chemotherapy. Our goal is to bring about the first real improvement in care for women with USC over the last 30 years.

Megan Ruhland, PhD

Dendritic cells are a type of immune cell that patrols tissues to find signs of disease. When they find a tumor, they can pick up pieces of multiple different cell types including normal cells, bacteria, and pieces of the tumor called antigens. Their main job is to carry these tumor antigens to special T cells that can kill tumors. They show the antigens to the T cells to let them know there is cancer in the body and guide the T cells to attack the tumor. In places like the skin, dendritic cells can pick up both harmless skin antigens and dangerous melanoma tumor antigens at the same time. This is tricky because dendritic cells need to show the harmful melanoma antigens to T cells to fight the cancer, but they also have to hide the harmless skin antigens from T cells so they don’t mistakenly attack healthy tissue. Our research shows that when dendritic cells take in many different types of antigens at once, it’s harder for them to tell the T cells about the tumor. This can weaken the immune system’s response to cancer. We are studying how dendritic cells can better separate these antigens to improve how they activate T cells against melanoma. Our goal is to use this knowledge to create better treatments that boost the immune system’s ability to fight cancer. This could lead to more effective therapies that protect normal tissues and strengthen the immune response against tumors.