Dr. Amy Stone is a professor at University of Las Vegas, Nevada. Amy studies the body’s immune reactions to infections and disease agents. When she was growing up outside Denver, Colorado, she spent her time playing video games, reading fantasy novels, and playing the flute. Science was always a part of Amy’s life growing up--she loved exploring outside, and her parents encouraged her interest in science by getting her a chemistry kit, microscope, and K’nex set. When she's not studying viruses in the lab, Amy still loves to read fantasy novels and play video games!
Dr. Stone studies something called an innate immune response. Basically, she looks at what happens in the first moments that a pathogen (something biological that causes disease or illness in its host) enters the body until about 4 days after. She also looks at different cell types to see how they respond to viruses and the different ways that they heal. Right now, Amy is doing lots of work to help learn more about SARS-CoV-2, the virus that causes COVID-19.
When a pathogen enters the human body, there are receptor cells that are responsible for recognizing the pathogen and setting off an immune system reaction. This immune response typically involves a type of white blood cells called “macrophages” (Greek for “big eaters”). Their job is to engulf and consume the pathogen. However, this causes inflammation (which results in things like pain and fever associated with being sick), so there are also some macrophages with an anti-inflammatory role; they help with tissue repair and healing when the immune response is over.
"I love my job for two main reasons.
1) I love discovering new things. There is a moment in the lab when you see a result and think that's odd. So, you try it again. When you get the same odd result, you know you have something new. That feeling of having, in my hands, a piece of knowledge that no one else in the world knows, and I am going to share that new knowledge with the world is one of the most exciting feelings I've ever had.
2) I love sharing my knowledge. The innate immune system is the coolest thing around. It knows how to fight off every kind of infection, and keeps us safe the vast majority of the time. And the innate immune system does it all by looking for patterns. It's so elegant! So simple! And so powerful! My excitement for the immune system and how the body fights disease just bubbles over and I have to share it. My job lets me share my excitement and love for science through teaching."
"I didn't make a decision to become a scientist. I kind of dropped into it. I was always curious as to how things worked but scientist wasn't on my list of possible careers. I first thought I was going to be a veterinarian because I loved animals. Then in 6th grade, we had a career day and I met with a veterinarian. She had us look at some cat X-rays and try to figure out what was wrong with the cat. I was bored to tears! There was no discovery, no excitement. Just observe and then compare with the knowledge that is already out there. So, then I decided that I was going to be a physicist because I decided I wanted to design roller coasters. I kept thinking I was going to be a physicist until I was in my second year of college. I was taking a Modern physics class and I hated it. Since I hated the Modern Physics class so much, I was doing badly in it."
Amy needed to change her major to one where her "D" in Physics would still count as passing, and Biology was her only option. So she switched majors to Biology until she could think of something she was more interested in. Once she took the Biology classes she signed up for, though, she realized that she LOVED biology! "Especially infectious diseases. I had always been fascinated by historical plagues like the Black Death and Small Pox. It turned out that there was an entire field dedicated to how the body fights disease - Immunology. And that is when I knew I wanted to be a scientist and study infectious diseases and how humans can fight them off. "
Several years ago, Amy released the results of a study that looked at the body’s innate immune response to West Nile Virus (WNV). WNV is an arbovirus, meaning it’s transmitted by mosquitos. It’s the most common arbovirus in the US, and a major cause of viral encephalitis, which is a dangerous swelling of the brain due to viral infection. There is currently no vaccine or cure to WNV, so it’s a major public health issue. Additionally, mosquito-borne diseases are expected to become more problematic with a warming climate, so a better understanding of how they work and how the body fights them is even more important.
The normal parasite-host cycle alternates between birds and mosquitoes. However, humans and horses can become "accidental hosts" when mosquitoes bite them.
Image courtesy of California Department of Public HealthA microscopic photograph of the West Nile Virus
Image credit: Cynthia Goldsmith, P.E. Rollin, USCDCPAmy was interested in learning more about a group of pathogen recognition receptors (the cells that first detect a pathogen) involved in the WNV immune response. They’re called “RIG-I-like receptors” (rig-eye-like)--kind of an odd name, but the important thing to know is that they’re the first line of defense against most viral infection. They control infection and keep the virus from entering the brain and nervous system. Scientists know that there are three of these RIG-I-like receptors involved in WNV response, but it was unclear exactly what their individual roles were. Their names are RIG-I (the group of receptors is named after this one), MDA5, and LGP2. Amy and her colleagues tried to get to the bottom of this by inactivating either RIG-I, MDA5, or LGP2 in mouse cells infected with West Nile Virus and seeing how the immune response differed each time. After enough tests, they were able to see clearly what each receptor’s job was in directing the immune response to WNV. This is big news because researchers can apply this understanding of what the body already does to developing a vaccine or a treatment that keeps the virus at bay.