My research program aims to better understand how the immune system can be used to treat childhood diseases. In children with cancer, the immune system is no longer able to rid the body of cancerous cells. In children with autoimmune diseases the immune system gets rid of healthy cells of the body. We are particularly interested in the metabolism of immune cells. Metabolism consists of all the chemical processes that occur within a living organism that maintain life. In immune cells, this means that building blocks (metabolites) need to be brought in to allow the duplication of a cell by making all crucial parts of new cells. In fast growing immune cells this is especially demanding, since they need to duplicate themselves very rapidly to protect against attacks on the normal function of our bodies by, for instance, infections or cancer. This requires a variety of building blocks, and a lot of energy. For this process, cells can acquire these building blocks from their environment, or make them via intricate biochemical pathways. When the right building blocks are not available, immune cells fail to increase in numbers and cannot perform their job.
We use biochemical and metabolomic techniques to understand what fuel is needed for immune cell function, and how immune cells sense the fuel that is available in their environment.
By closely collaborating with Clinicians and Clinician scientists at BCCHR we are aiming to apply the findings to design better treatments for children with immune related diseases.
Triacylglycerol synthesis enhances macrophage inflammatory function Castoldi A and Monteiro LB and van Teijlingen Bakker N and Sanin DE and Rana N and Corrado M and Cameron AM and Hässler F and Matsushita M and Caputa G and Klein Geltink RI and Pearce EJ DOI: 10.1101/2020.02.03.932079 02/2020
Polyamines and eIF5A Hypusination Modulate Mitochondrial Respiration and Macrophage Activation. Cell metabolism Puleston DJ and Buck MD and Klein Geltink RI and Kyle RL and Caputa G and O'Sullivan D and Cameron AM and Castoldi A and Musa Y and Kabat AM and Zhang Y and Flachsmann LJ and Field CS and Pearce EL DOI: 10.1016/j.cmet.2019.05.003 PubMed: 31130465 05/2019
Acetate Promotes T Cell Effector Function during Glucose Restriction. Cell reports Qiu J and Villa M and Sanin DE and Buck MD and O'Sullivan D and Ching R and Matsushita M and Grzes KM and Winkler F and Chang CH and Curtis JD and Kyle RL and Van Teijlingen Bakker N and Pearce EL DOI: 10.1016/j.celrep.2019.04.022 PubMed: 31091446 05/2019
Establishment of a transgenic mouse to model ETV7 expressing human tumors Transgenic Research 02/2019
The role of metabolism in regulation of function in immune cells My lab aims to better understand the role of metabolism in regulation of function in immune cells. We aim to expand our understanding of the role of metabolism in the dysfunction of immune cells in cancer, and their hyperactivation in autoimmune conditions.
When cells are confronted with changing environments they have to adapt to their new surroundings to maintain cellular function. This adaptation is especially relevant for immune cells that move throughout the body and encounter different levels of metabolites and nutrients in the blood, tissues or tumours they traverse. The availability of nutrients influences immune cell metabolism, but having a metabolite available does not mean a cell will necessarily use it.
Cellular metabolism consists of an interconnected network that is influenced by at least 4 factors which we aim to better understand:
1. Metabolite availability How do immune cells sense their nutritional environment, and how are these signals transmitted?
2. Metabolite transport into the cell How are metabolite transporters regulated during immune cell activation?
3. Metabolic enzyme expression Metabolic enzymes are often considered "household genes" for control experiments. How is activity of these enzymes modulated?
4. Availability of enzyme cofactors Most, if not all, metabolic enzymes are dependent on substrate and cofactors. We are interested in the sensing of cofactor status and their effects on metabolic pathway flux.
Not all immune cells use the same metabolic pathways even if metabolites are abundant, transporters and enzymes are expressed, and cofactors are available. The response can be regulated by growth factors, cytokines, or immune cell receptor signaling, and we aim to better understand the signals that provide the instructions for which metabolic pathway to use.
Dr. Ramon Klein Geltink joins BC Children's Hospital to study how the fuel immune cells use can affect the way they function. His research could pave the way for new treatments that use nutrients and other signals to encourage the best possible immune response for a given disease.
Human DNA testing could improve outcomes for patients with COVID-19.
That’s the key idea put forth in preliminary research posted this month to bioRxiv that highlights the potential benefits of testing COVID-19 patients for genetic variants of ACE2—the protein identified as the point-of-entry for the SARS-COV-2 virus into human cells.
Congratulations to the BC Children's and BC Women's investigators who were awarded funding through the highly competitive Canadian Institutes of Health Research (CIHR) Project Grant Fall 2019 competition.
A new study suggests that specialized immune cells that dampen inflammation and help repair the gut could be used as a potential therapy for children dealing with the painful symptoms of inflammatory bowel disease.
We believe there’s nothing we can’t do with your support. It can take years to turn scientific breakthrough into new interventions and treatments. Funding helps speed the pace of change. When given the resources, we can bring transformative therapies – and hope – out of the laboratory and into the clinic to save and improve children’s lives.