Dr. Laura Lewandowski, a pediatric rheumatologist and assistant clinical investigator, poses for a portrait at a centrifuge with tubes containing patient samples for autoimmunity testing in the lab where she works at the ɫtv Institutes of Health, Monday, Aug. 25, 2025, in Bethesda, Md. Lewandowski leads a team studying the genetics of pediatric lupus. "I've always been a person who loves puzzles and problem solving and the big picture of how people get sick. What I'm explaining to my family is that I'm a gene hunter. I could do back flips, inside that's how I feel when I can see something new. It's amazing. What I am studying, I feel it's a super exciting moment to be doing this." (AP Photo/David Goldman)
Research fellow Sachin Surwase poses for a portrait while examining a mouse pancreas tissue through a microscope in a biomedical engineering lab at Johns Hopkins University in Baltimore, Md., Tuesday, May 13, 2025. Surwase is part of a team developing possible new ways to treat Type 1 diabetes, an autoimmune disease, by reprogramming the immune system to protect and not harm insulin-producing cells in the pancreas. "For me, it started with my grandmother, she died of cancer, so that was the motivation to work on these diseases. But then I got interested in autoimmunity. That fascinated me that why in one disease we need to increase the response of immunity but in others we need to suppress our own immunity. It's like a two-edged sword." (AP Photo/David Goldman)
Dr. Justin Kwong, a research fellow, poses for a portrait as he removes cells from an incubator in the lab where he works at the ɫtv Institutes of Health, Monday, Aug. 25, 2025, in Bethesda, Md. Kwong coaxes human stem cells to grow into a kind of immune cell involved in autoimmune diseases, and has to replenish batches with fresh nutrients. "These are my babies. It's very rewarding to do this. It's very exciting but difficult to manage. I have to come in every day to feed them. Seven days a week. That's why I have a personal attachment to the cells. It takes a lot of your life, like a baby." (AP Photo/David Goldman)
Researcher Kathryn Luly poses for a portrait holding a plate of mice cell samples in a biomedical engineering lab at Johns Hopkins University in Baltimore, Md., Tuesday, May 13, 2025. Luly is part of a team using mRNA technology to develop new treatments for autoimmune diseases. Cell tests show if the different formulas are reaching the correct targets. "The thing that's really amazing about the immune system is that it's all this very unique balance. It's like a little bit of this is good, but too much is bad. So as an engineer, it's a very unique problem of trying to sort of thread the needle and find that balance between activation and suppression. I think it appeals to the engineering side of my brain and then also some of the biology of the immune system is just really fascinating. It's a really nice blend of biology and engineering that comes together.” (AP Photo/David Goldman)
Dr. William Ambler, a translational research scholar who studies how biological sex affects the risk of autoimmune diseases, poses for a portrait while preparing a solution in the lab where he works at the ɫtv Institutes of Health, Monday, Aug. 25, 2025, in Bethesda, Md. "I'm fascinated in autoimmunity in general because the causes of it are so misunderstood. There is so much area to understand for treatment and hopefully prevention. What we're doing is very fundamental and has implications beyond autoimmunity. I do feel like we're at an inflection point of some sorts." (AP Photo/David Goldman)
Dr. Laura Lewandowski, a pediatric rheumatologist and assistant clinical investigator, poses for a portrait at a centrifuge with tubes containing patient samples for autoimmunity testing in the lab where she works at the ɫtv Institutes of Health, Monday, Aug. 25, 2025, in Bethesda, Md. Lewandowski leads a team studying the genetics of pediatric lupus. "I've always been a person who loves puzzles and problem solving and the big picture of how people get sick. What I'm explaining to my family is that I'm a gene hunter. I could do back flips, inside that's how I feel when I can see something new. It's amazing. What I am studying, I feel it's a super exciting moment to be doing this." (AP Photo/David Goldman)
Research fellow Sachin Surwase poses for a portrait while examining a mouse pancreas tissue through a microscope in a biomedical engineering lab at Johns Hopkins University in Baltimore, Md., Tuesday, May 13, 2025. Surwase is part of a team developing possible new ways to treat Type 1 diabetes, an autoimmune disease, by reprogramming the immune system to protect and not harm insulin-producing cells in the pancreas. "For me, it started with my grandmother, she died of cancer, so that was the motivation to work on these diseases. But then I got interested in autoimmunity. That fascinated me that why in one disease we need to increase the response of immunity but in others we need to suppress our own immunity. It's like a two-edged sword." (AP Photo/David Goldman)
Dr. Justin Kwong, a research fellow, poses for a portrait as he removes cells from an incubator in the lab where he works at the ɫtv Institutes of Health, Monday, Aug. 25, 2025, in Bethesda, Md. Kwong coaxes human stem cells to grow into a kind of immune cell involved in autoimmune diseases, and has to replenish batches with fresh nutrients. "These are my babies. It's very rewarding to do this. It's very exciting but difficult to manage. I have to come in every day to feed them. Seven days a week. That's why I have a personal attachment to the cells. It takes a lot of your life, like a baby." (AP Photo/David Goldman)
Researcher Kathryn Luly poses for a portrait holding a plate of mice cell samples in a biomedical engineering lab at Johns Hopkins University in Baltimore, Md., Tuesday, May 13, 2025. Luly is part of a team using mRNA technology to develop new treatments for autoimmune diseases. Cell tests show if the different formulas are reaching the correct targets. "The thing that's really amazing about the immune system is that it's all this very unique balance. It's like a little bit of this is good, but too much is bad. So as an engineer, it's a very unique problem of trying to sort of thread the needle and find that balance between activation and suppression. I think it appeals to the engineering side of my brain and then also some of the biology of the immune system is just really fascinating. It's a really nice blend of biology and engineering that comes together.” (AP Photo/David Goldman)
Dr. William Ambler, a translational research scholar who studies how biological sex affects the risk of autoimmune diseases, poses for a portrait while preparing a solution in the lab where he works at the ɫtv Institutes of Health, Monday, Aug. 25, 2025, in Bethesda, Md. "I'm fascinated in autoimmunity in general because the causes of it are so misunderstood. There is so much area to understand for treatment and hopefully prevention. What we're doing is very fundamental and has implications beyond autoimmunity. I do feel like we're at an inflection point of some sorts." (AP Photo/David Goldman)
A peek inside some leading research labs shows how scientists-turned-detectives are painstakingly decoding what causes autoimmune diseases and how to stop the immune system from attacking you instead of protecting you.
It’s a huge challenge. By the ɫtv Institutes of Health’s newest count there are about affecting tens of millions of people.
Unraveling them requires patience, persistence — and sophisticated technology to even see the suspects. Researchers use laser-powered machinery and brightly colored fluorescent dyes to tell rogue cells from normal ones.
Take Type 1 diabetes, caused when cells in the pancreas that produce insulin are gradually killed off by rogue T cells. In a biomedical engineering lab at Johns Hopkins University, researchers examine mouse pancreas cells on a computer screen. Red marks the killer cells. In yellow are “peacemaker” cells that are supposed to tamp down autoimmune reactions – but they’re outnumbered.
Another type of immune cell, B cells, drive autoimmune diseases by producing antibodies that mistake healthy tissue for foreign invaders. At NIH, Dr. Iago Pinal-Fernandez studies myositis, a poorly understood group of muscle-weakening diseases. His research shows rogue antibodies don’t just damage muscles by latching onto their surface. They can sneak inside muscle cells and disrupt their normal functions in ways that help explain varying symptoms.
“When I started, nothing was known about the type of autoimmune disease we study. Now finally we’re able to tell patients, ’You have this disease and this is the mechanism of disease,” he said.
In another NIH lab, Dr. Mariana Kaplan’s team is hunting the root and other autoimmune diseases — what makes the immune system run amok in the first place — and why they so often strike women.
Today's drugs tamp down symptoms but don't correct the problem. Now in early-phase clinical trials are treatments that instead aim to fix dysfunctional immune pathways.
At Hopkins, scientists are working on next-generation versions, not yet ready to try in people. In one lab, they're developing nanoparticle-based treatment to dial down pancreas-killing cells in Type 1 diabetes and ramp up “peacemaker” cells.
And in another Hopkins lab, researchers are developing what they hope will become more precise treatments for rheumatoid arthritis, lupus and other antibody-driven illnesses – drugs that search out and destroy “bad” B cells.
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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.
This is a documentary photo story curated by AP photo editors.
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