David Julius, PhD

Our group is interested in understanding how sensory systems enable us to perceive our world. In one aspect of our research, we exploit the power of natural products to elucidate molecular mechanisms of touch and pain sensation. For example, we have asked how capsaicin, the main pungent ingredient in "hot" chili peppers, elicits burning pain, and how menthol, the cooling agent in mint leaves, evokes an icy cool sensation. Using these and other agents as pharmacological probes, we have identified ion channels on sensory nerve fibers that are activated by heat, cold, or chemical irritants, providing molecular insight into the process of thermosensation, pain, and itch. With the aid of genetic, electrophysiological, structural, and behavioral methods, we are asking how these ion channels are modulated in response to tumor growth, infection, or other forms of injury that produce inflammation and pain hypersensitivity. These basic scientific studies are helping to lay a foundation for the discovery and development of novel analgesic drugs.