How Does Aging Affect Innate Immunity?

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Immunity?","url":"https://medicine.yale.edu/news-article/how-does-aging-affect-innate-immunity/","Image":{"@type":"ImageObject","url":"https://ysm-res.cloudinary.com/image/upload/c_limit,f_auto,h_630,q_auto,w_1200/v1/yms/prod/24287600-e6f0-4e2f-81a2-0192075fd972","description":"Close-up of mother and daughter","height":1200,"width":630,"@context":"http://schema.org"},"dateCreated":"2024-11-20","datePublished":"2024-11-20","articleBody":"Cellular immunologist Ruth Montgomery, PhD, is an expert in using novel technology in human translational studies. Her research identifies individual differences in immune responses that lead to divergent infection outcomes. Her group focuses on the effects of aging and age-associated diseases on innate immunity, among other areas. Worldwide, the population is getting older, so it’s imperative to understand the cell changes that come with age, stresses Montgomery, who is a professor of medicine (rheumatology) at Yale School of Medicine, and of epidemiology (microbial diseases) at Yale School of Public Health. “Older people are more susceptible to infectious diseases and less responsive to vaccines,” she said. During her time at Yale, Montgomery has studied individual variations that influence susceptibility to West Nile, dengue, Zika, and COVID-19 infections. Her recent work includes inflammatory profiling of patients with sickle cell disease, who suffer from specific but poorly understood forms of immunosuppression. In a Q&A, Montgomery discusses the effects of aging on innate immunity, a surprising discovery about West Nile virus, and how advanced technology influences her research. How does aging affect innate immunity? The innate immune system consists of white blood cells, including neutrophils, which are the first responders to infection. In humans, 75% of the white cells in the blood are neutrophils. These specialized cells are born every day and live about 24 hours. Even though these cells are born new every day, they respond differently to stimuli depending on whether they are from an older person or a younger one. In our studies, we enroll people under 35 and over 60 into two distinct groups, and then we test what the cells are able to do, what functions they have, and how they respond to stimulation. In other studies, we look at cells from individuals with severe disease compared to those who have an asymptomatic infection to identify differences between the two groups. My work is focused on using the most in-depth technology to do detailed immune profiling of patient samples to understand the differences in cells and responses to viruses. In addition to the cell function assays that we've been doing for longer, we are currently studying the metabolites and proteins in the blood and bringing all of that together. We want to understand not only how you turn on the immune system but also how you regulate it and turn it down when it's not needed. Sometimes, the over-exuberance of the immune response makes it difficult for a patient to recover. That's been true in COVID, and it's also true in some cases of West Nile virus infection. Have you had any surprising discoveries? I'm always excited and surprised when we discover something about how cells work. For example, in a young person, when cells get infected with West Nile virus, they bring down the level of one of the molecules that recognizes the virus receptors to avoid an over-exuberant immune response. However, in an older person, that level stays high, so the cells continue to progress in an activation pathway, which can be difficult for the patient. It’s a striking difference, and I didn’t expect it. Tell us about the future direction of your work. Our most recent project is centered on patients with sickle cell disease. We identify differences in the immune cell pathways at two different time points—at baseline and when they have a crisis. We then compare the responses to those of household contacts who don't have sickle cell disease. We want to understand which pathways are relevant to the difficulty in immune responses that these patients have. Quite a lot is understood about how you get sickle cell and what it means for your red blood cells, but there's little information on how the immune system works in that patient group. It’s an exciting new area. Every few years, there's a revolution in how we study cells, and we use the latest techniques when we move to a new project. We don't go back and repeat the old ways of doing things. Currently, we do single-cell RNA sequencing, and we also use a technique called CyTOF, a multi-parameter cell identification system that I launched at Yale in 2013. With CyTOF, we measure 50 parameters at the same time in the cell when we used to be limited to 8 or 10. And we not only look at what the cell is doing but also the environment. More and more now, if we can, we study the tissue of the host, not just the circulating blood. A lot of what goes on in immunity is in the tissues of the body. With each project, we learn new and more in-depth ways to study how the immune response works. The Department of Internal Medicine at Yale School of Medicine is among the nation's premier departments, bringing together an elite cadre of clinicians, investigators, educators, and staff in one of the world's top medical schools. To learn more, visit Internal Medicine.","author":[{"@type":"Person","name":"Serena Crawford","@context":"http://schema.org"}],"keywords":["Infectious Diseases","Rheumatology","Internal Medicine","Faculty","Aging"],"publisher":{"@type":"NewsMediaOrganization","name":"Yale School of Medicine","foundingDate":"1810-10-15","duns":"003036709","url":"https://medicine.yale.edu","logo":{"@type":"ImageObject","url":"https://medicine.yale.edu/icons/ysm/largetile.png","height":310,"width":310,"@context":"http://schema.org"},"sameAs":["https://www.facebook.com/YaleSchoolOfMedicine","https://twitter.com/YaleMed","https://www.instagram.com/yaleschoolofmed/?hl=en","https://www.linkedin.com/school/yale-university-school-of-medicine/","https://www.youtube.com/user/YaleMedicine","https://vimeo.com/user30675202"],"department":"Office of Communication","parentOrganization":{"@type":"CollegeOrUniversity","Name":"Yale University","foundingDate":"1701","duns":"043207562","url":"https://www.yale.edu/","address":{"@type":"PostalAddress","addressCountry":"USA","addressLocality":"New Haven","addressRegion":"CT","postalCode":"06520","streetAddress":"333 Cedar Street","@context":"http://schema.org"},"@context":"http://schema.org"},"@context":"http://schema.org"},"description":"Worldwide, the population is getting older, so it’s imperative to understand the cell changes that come with age, stresses Ruth Montgomery, PhD, professor of medicine (rheumatology) and of epidemiology (microbial diseases) at Yale School of Medicine. “Older people are more susceptible to infectious diseases and less responsive to vaccines,” she said. 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Innate Immunity?</h1></div><div class="article-header__publication-info"><div class="news-details__date">November 20, 2024</div><div class="news-details__submitter">by <a href="/internal-medicine/profile/serena-crawford/#links-details-section" tabindex="0" class="link link--size--small link--width--inline link--align--right link--color--black link--font--normal link--decorate-color--light-blue"><span class="link__label">Serena Crawford</span></a></div><div class="news-details__contact"></div></div><div class="article-header__share-panel"><ul class="share-panel share-panel--horizontal"><li class="share-panel__item"><button class="share-panel__link" aria-label="Share via X" type="button"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" focusable="false" class="share-panel__icon"><path d="M17.294 22.475 1.454 1.453h5.252l15.84 21.022zm4.508-21.022-8.35 8.954M2.198 22.475l8.344-8.948" 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aria-label="Print page" class="share-panel__button"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" focusable="false" class="share-panel__icon share-panel__print-icon"><path d="M5.25 17.249h-3a1.5 1.5 0 0 1-1.5-1.5v-7.5a1.5 1.5 0 0 1 1.5-1.5h19.5a1.5 1.5 0 0 1 1.5 1.5v7.5a1.5 1.5 0 0 1-1.5 1.5h-3" style="stroke-linecap:round;stroke-linejoin:round;fill:currentColor;stroke-width:.5px"></path><path d="M3.75 9.749h1.5" style="stroke-linecap:round;stroke-linejoin:round;stroke-width:1.5px;stroke-opacity:1"></path><path d="M5.25 12.749h13.5v10H5.25z" class="paper" style="stroke-linecap:round;stroke-linejoin:round;fill:currentColor;stroke-width:2"></path><path d="M18.75 6.749H5.25v-4.5a1.5 1.5 0 0 1 1.5-1.5h10.5a1.5 1.5 0 0 1 1.5 1.5Z" style="stroke-linecap:round;stroke-linejoin:round;fill:currentColor;stroke-width:.25px;stroke-opacity:1"></path></svg></button></li></ul></div><div class="article-header__row"><h2 class="article-header__subtitle">A Q&A with Ruth Montgomery</h2></div></div><div class="article-details__hero-gallery-container"><div><div class="media-gallery-item media-gallery-item--width-mode--auto"><div class="media-gallery-item__media-container"><div class="media-gallery-item__poster"><figure class="poster poster--width-mode--auto"><span class="" style="display:inline-block"></span><div class="poster__details"><div class="poster__caption-container"><h1 class="poster__title">Ruth Montgomery, PhD</h1></div></div></figure></div></div></div></div></div><div class="article-content__container"><div class="article-content__item"><div class="article-content__text article-content__text--media-hidden"><p>Cellular immunologist <a data-link-type="external" href="https://medicine.yale.edu/profile/ruth-montgomery/">Ruth Montgomery, PhD</a>, is an expert in using novel technology in human translational studies. Her research identifies individual differences in immune responses that lead to divergent infection outcomes. Her group focuses on the effects of aging and age-associated diseases on innate immunity, among other areas. </p> <p>Worldwide, the population is getting older, so it’s imperative to understand the cell changes that come with age, stresses Montgomery, who is a professor of medicine (rheumatology) at Yale School of Medicine, and of epidemiology (microbial diseases) at Yale School of Public Health. “Older people are more susceptible to infectious diseases and less responsive to vaccines,” she said. </p> <p>During her time at Yale, Montgomery has studied individual variations that influence susceptibility to West Nile, dengue, Zika, and COVID-19 infections. Her recent work includes inflammatory profiling of patients with sickle cell disease, who suffer from specific but poorly understood forms of immunosuppression. </p> <p>In a Q&A, Montgomery discusses the effects of aging on innate immunity, a surprising discovery about West Nile virus, and how advanced technology influences her research.</p> <h2><strong class="arx-bold-text">How does aging affect innate immunity? </strong></h2> <p>The innate immune system consists of white blood cells, including neutrophils, which are the first responders to infection. In humans, 75% of the white cells in the blood are neutrophils. These specialized cells are born every day and live about 24 hours. </p> <p>Even though these cells are born new every day, they respond differently to stimuli depending on whether they are from an older person or a younger one. In our studies, we enroll people under 35 and over 60 into two distinct groups, and then we test what the cells are able to do, what functions they have, and how they respond to stimulation. In other studies, we look at cells from individuals with severe disease compared to those who have an asymptomatic infection to identify differences between the two groups. </p> <p>My work is focused on using the most in-depth technology to do detailed immune profiling of patient samples to understand the differences in cells and responses to viruses. In addition to the cell function assays that we've been doing for longer, we are currently studying the metabolites and proteins in the blood and bringing all of that together. We want to understand not only how you turn on the immune system but also how you regulate it and turn it down when it's not needed. Sometimes, the over-exuberance of the immune response makes it difficult for a patient to recover. That's been true in COVID, and it's also true in some cases of West Nile virus infection.</p> <h2><strong class="arx-bold-text">Have you had any surprising discoveries? </strong></h2> <p>I'm always excited and surprised when we discover something about how cells work. For example, in a young person, when cells get infected with West Nile virus, they bring down the level of one of the molecules that recognizes the virus receptors to avoid an over-exuberant immune response. However, in an older person, that level stays high, so the cells continue to progress in an activation pathway, which can be difficult for the patient. It’s a striking difference, and I didn’t expect it. </p> <h2><strong class="arx-bold-text">Tell us about the future direction of your work.</strong></h2> <p>Our most recent project is centered on patients with sickle cell disease. We identify differences in the immune cell pathways at two different time points—at baseline and when they have a crisis. We then compare the responses to those of household contacts who don't have sickle cell disease. We want to understand which pathways are relevant to the difficulty in immune responses that these patients have. Quite a lot is understood about how you get sickle cell and what it means for your red blood cells, but there's little information on how the immune system works in that patient group. It’s an exciting new area.</p> <p>Every few years, there's a revolution in how we study cells, and we use the latest techniques when we move to a new project. We don't go back and repeat the old ways of doing things. Currently, we do single-cell RNA sequencing, and we also use a technique called CyTOF, a multi-parameter cell identification system that I launched at Yale in 2013. With CyTOF, we measure 50 parameters at the same time in the cell when we used to be limited to 8 or 10. And we not only look at what the cell is doing but also the environment. More and more now, if we can, we study the tissue of the host, not just the circulating blood. A lot of what goes on in immunity is in the tissues of the body. </p> <p>With each project, we learn new and more in-depth ways to study how the immune response works.</p> <p><em class="arx-italic-text">The Department of Internal Medicine at Yale School of Medicine is among the nation's premier departments, bringing together an elite cadre of clinicians, investigators, educators, and staff in one of the world's top medical schools. To learn more, visit </em><a href="https://medicine.yale.edu/internal-medicine/"><em class="arx-italic-text">Internal Medicine.</em></a></p></div></div><div class="article-content__item"><div class="article-tags"><h2 class="article-tags__title">Tags</h2><ul class="article-tags__list"><li class="article-tags__item"><a href="/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=infectious%20diseases" tabindex="0" class="hyperlink" aria-label="Search for Infectious Diseases articles">Infectious Diseases</a></li><li class="article-tags__item"><a href="/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=rheumatology" tabindex="0" class="hyperlink" aria-label="Search for Rheumatology articles">Rheumatology</a></li><li class="article-tags__item"><a href="/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=internal%20medicine" tabindex="0" 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profile-detailed-info-list-item--link"><div class="profile-detailed-info-list-item__content-container"><a href="/internal-medicine/profile/ruth-montgomery/" aria-label="Ruth R Montgomery" class="profile-detailed-info-list-item__content"><div class="profile-detailed-info-list-item__thumbnail-wrapper"><span class="" style="display:inline-block"></span></div><div class="profile-detailed-info-list-item__info"><span class="profile-detailed-info-list-item__name">Ruth R Montgomery, PhD</span><div class="LinesEllipsis text-overflow profile-detailed-info-list-item__title">Professor of Medicine and Professor of Epidemiology (Microbial Diseases); Associate Dean for Scientific Affairs, Dept Clinical: Internal Medicine<wbr/></div></div></a></div></div></li></ul></div></div></div></div></article></section></div></div><div class="sidebar page__sidebar-container"><div class="sidebar__sticky-container"><div class="component-wrapper component-wrapper--all"></div></div></div></main><footer 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Her research identifies individual differences in immune responses that lead to divergent infection outcomes. Her group focuses on the effects of aging and age-associated diseases on innate immunity, among other areas. Worldwide, the population is getting older, so it’s imperative to understand the cell changes that come with age, stresses Montgomery, who is a professor of medicine (rheumatology) at Yale School of Medicine, and of epidemiology (microbial diseases) at Yale School of Public Health. “Older people are more susceptible to infectious diseases and less responsive to vaccines,” she said. During her time at Yale, Montgomery has studied individual variations that influence susceptibility to West Nile, dengue, Zika, and COVID-19 infections. Her recent work includes inflammatory profiling of patients with sickle cell disease, who suffer from specific but poorly understood forms of immunosuppression. In a Q&A, Montgomery discusses the effects of aging on innate immunity, a surprising discovery about West Nile virus, and how advanced technology influences her research. How does aging affect innate immunity? The innate immune system consists of white blood cells, including neutrophils, which are the first responders to infection. In humans, 75% of the white cells in the blood are neutrophils. These specialized cells are born every day and live about 24 hours. Even though these cells are born new every day, they respond differently to stimuli depending on whether they are from an older person or a younger one. In our studies, we enroll people under 35 and over 60 into two distinct groups, and then we test what the cells are able to do, what functions they have, and how they respond to stimulation. In other studies, we look at cells from individuals with severe disease compared to those who have an asymptomatic infection to identify differences between the two groups. My work is focused on using the most in-depth technology to do detailed immune profiling of patient samples to understand the differences in cells and responses to viruses. In addition to the cell function assays that we've been doing for longer, we are currently studying the metabolites and proteins in the blood and bringing all of that together. We want to understand not only how you turn on the immune system but also how you regulate it and turn it down when it's not needed. Sometimes, the over-exuberance of the immune response makes it difficult for a patient to recover. That's been true in COVID, and it's also true in some cases of West Nile virus infection. Have you had any surprising discoveries? I'm always excited and surprised when we discover something about how cells work. For example, in a young person, when cells get infected with West Nile virus, they bring down the level of one of the molecules that recognizes the virus receptors to avoid an over-exuberant immune response. However, in an older person, that level stays high, so the cells continue to progress in an activation pathway, which can be difficult for the patient. It’s a striking difference, and I didn’t expect it. Tell us about the future direction of your work. Our most recent project is centered on patients with sickle cell disease. We identify differences in the immune cell pathways at two different time points—at baseline and when they have a crisis. We then compare the responses to those of household contacts who don't have sickle cell disease. We want to understand which pathways are relevant to the difficulty in immune responses that these patients have. Quite a lot is understood about how you get sickle cell and what it means for your red blood cells, but there's little information on how the immune system works in that patient group. It’s an exciting new area. Every few years, there's a revolution in how we study cells, and we use the latest techniques when we move to a new project. We don't go back and repeat the old ways of doing things. Currently, we do single-cell RNA sequencing, and we also use a technique called CyTOF, a multi-parameter cell identification system that I launched at Yale in 2013. With CyTOF, we measure 50 parameters at the same time in the cell when we used to be limited to 8 or 10. And we not only look at what the cell is doing but also the environment. More and more now, if we can, we study the tissue of the host, not just the circulating blood. A lot of what goes on in immunity is in the tissues of the body. With each project, we learn new and more in-depth ways to study how the immune response works. 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","content":"<p>Cellular immunologist <a data-link-type=\"external\" href=\"https://medicine.yale.edu/profile/ruth-montgomery/\">Ruth Montgomery, PhD</a>, is an expert in using novel technology in human translational studies. Her research identifies individual differences in immune responses that lead to divergent infection outcomes. Her group focuses on the effects of aging and age-associated diseases on innate immunity, among other areas. </p> <p>Worldwide, the population is getting older, so it’s imperative to understand the cell changes that come with age, stresses Montgomery, who is a professor of medicine (rheumatology) at Yale School of Medicine, and of epidemiology (microbial diseases) at Yale School of Public Health. “Older people are more susceptible to infectious diseases and less responsive to vaccines,” she said. </p> <p>During her time at Yale, Montgomery has studied individual variations that influence susceptibility to West Nile, dengue, Zika, and COVID-19 infections. Her recent work includes inflammatory profiling of patients with sickle cell disease, who suffer from specific but poorly understood forms of immunosuppression. </p> <p>In a Q&amp;A, Montgomery discusses the effects of aging on innate immunity, a surprising discovery about West Nile virus, and how advanced technology influences her research.</p> <h2><strong class=\"arx-bold-text\">How does aging affect innate immunity? </strong></h2> <p>The innate immune system consists of white blood cells, including neutrophils, which are the first responders to infection. In humans, 75% of the white cells in the blood are neutrophils. These specialized cells are born every day and live about 24 hours. </p> <p>Even though these cells are born new every day, they respond differently to stimuli depending on whether they are from an older person or a younger one. In our studies, we enroll people under 35 and over 60 into two distinct groups, and then we test what the cells are able to do, what functions they have, and how they respond to stimulation. In other studies, we look at cells from individuals with severe disease compared to those who have an asymptomatic infection to identify differences between the two groups. </p> <p>My work is focused on using the most in-depth technology to do detailed immune profiling of patient samples to understand the differences in cells and responses to viruses. In addition to the cell function assays that we've been doing for longer, we are currently studying the metabolites and proteins in the blood and bringing all of that together. We want to understand not only how you turn on the immune system but also how you regulate it and turn it down when it's not needed. Sometimes, the over-exuberance of the immune response makes it difficult for a patient to recover. That's been true in COVID, and it's also true in some cases of West Nile virus infection.</p> <h2><strong class=\"arx-bold-text\">Have you had any surprising discoveries? </strong></h2> <p>I'm always excited and surprised when we discover something about how cells work. For example, in a young person, when cells get infected with West Nile virus, they bring down the level of one of the molecules that recognizes the virus receptors to avoid an over-exuberant immune response. However, in an older person, that level stays high, so the cells continue to progress in an activation pathway, which can be difficult for the patient. It’s a striking difference, and I didn’t expect it. </p> <h2><strong class=\"arx-bold-text\">Tell us about the future direction of your work.</strong></h2> <p>Our most recent project is centered on patients with sickle cell disease. We identify differences in the immune cell pathways at two different time points—at baseline and when they have a crisis. We then compare the responses to those of household contacts who don't have sickle cell disease. We want to understand which pathways are relevant to the difficulty in immune responses that these patients have. Quite a lot is understood about how you get sickle cell and what it means for your red blood cells, but there's little information on how the immune system works in that patient group. It’s an exciting new area.</p> <p>Every few years, there's a revolution in how we study cells, and we use the latest techniques when we move to a new project. We don't go back and repeat the old ways of doing things. Currently, we do single-cell RNA sequencing, and we also use a technique called CyTOF, a multi-parameter cell identification system that I launched at Yale in 2013. With CyTOF, we measure 50 parameters at the same time in the cell when we used to be limited to 8 or 10. And we not only look at what the cell is doing but also the environment. More and more now, if we can, we study the tissue of the host, not just the circulating blood. A lot of what goes on in immunity is in the tissues of the body. </p> <p>With each project, we learn new and more in-depth ways to study how the immune response works.</p> <p><em class=\"arx-italic-text\">The Department of Internal Medicine at Yale School of Medicine is among the nation's premier departments, bringing together an elite cadre of clinicians, investigators, educators, and staff in one of the world's top medical schools. 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My work is focused on using the most in-depth technology to do detailed immune profiling of patient samples to understand the differences in cells and responses to viruses. In addition to the cell function assays that we've been doing for longer, we are currently studying the metabolites and proteins in the blood and bringing all of that together. We want to understand not only how you turn on the immune system but also how you regulate it and turn it down when it's not needed. Sometimes, the over-exuberance of the immune response makes it difficult for a patient to recover. That's been true in COVID, and it's also true in some cases of West Nile virus infection. Have you had any surprising discoveries? I'm always excited and surprised when we discover something about how cells work. For example, in a young person, when cells get infected with West Nile virus, they bring down the level of one of the molecules that recognizes the virus receptors to avoid an over-exuberant immune response. However, in an older person, that level stays high, so the cells continue to progress in an activation pathway, which can be difficult for the patient. It’s a striking difference, and I didn’t expect it. Tell us about the future direction of your work. Our most recent project is centered on patients with sickle cell disease. We identify differences in the immune cell pathways at two different time points—at baseline and when they have a crisis. We then compare the responses to those of household contacts who don't have sickle cell disease. We want to understand which pathways are relevant to the difficulty in immune responses that these patients have. Quite a lot is understood about how you get sickle cell and what it means for your red blood cells, but there's little information on how the immune system works in that patient group. It’s an exciting new area. Every few years, there's a revolution in how we study cells, and we use the latest techniques when we move to a new project. We don't go back and repeat the old ways of doing things. Currently, we do single-cell RNA sequencing, and we also use a technique called CyTOF, a multi-parameter cell identification system that I launched at Yale in 2013. With CyTOF, we measure 50 parameters at the same time in the cell when we used to be limited to 8 or 10. And we not only look at what the cell is doing but also the environment. More and more now, if we can, we study the tissue of the host, not just the circulating blood. A lot of what goes on in immunity is in the tissues of the body. With each project, we learn new and more in-depth ways to study how the immune response works. 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","content":"<p>Cellular immunologist <a data-link-type=\"external\" href=\"https://medicine.yale.edu/profile/ruth-montgomery/\">Ruth Montgomery, PhD</a>, is an expert in using novel technology in human translational studies. Her research identifies individual differences in immune responses that lead to divergent infection outcomes. Her group focuses on the effects of aging and age-associated diseases on innate immunity, among other areas. </p> <p>Worldwide, the population is getting older, so it’s imperative to understand the cell changes that come with age, stresses Montgomery, who is a professor of medicine (rheumatology) at Yale School of Medicine, and of epidemiology (microbial diseases) at Yale School of Public Health. “Older people are more susceptible to infectious diseases and less responsive to vaccines,” she said. </p> <p>During her time at Yale, Montgomery has studied individual variations that influence susceptibility to West Nile, dengue, Zika, and COVID-19 infections. Her recent work includes inflammatory profiling of patients with sickle cell disease, who suffer from specific but poorly understood forms of immunosuppression. </p> <p>In a Q&amp;A, Montgomery discusses the effects of aging on innate immunity, a surprising discovery about West Nile virus, and how advanced technology influences her research.</p> <h2><strong class=\"arx-bold-text\">How does aging affect innate immunity? </strong></h2> <p>The innate immune system consists of white blood cells, including neutrophils, which are the first responders to infection. In humans, 75% of the white cells in the blood are neutrophils. These specialized cells are born every day and live about 24 hours. </p> <p>Even though these cells are born new every day, they respond differently to stimuli depending on whether they are from an older person or a younger one. In our studies, we enroll people under 35 and over 60 into two distinct groups, and then we test what the cells are able to do, what functions they have, and how they respond to stimulation. In other studies, we look at cells from individuals with severe disease compared to those who have an asymptomatic infection to identify differences between the two groups. </p> <p>My work is focused on using the most in-depth technology to do detailed immune profiling of patient samples to understand the differences in cells and responses to viruses. In addition to the cell function assays that we've been doing for longer, we are currently studying the metabolites and proteins in the blood and bringing all of that together. We want to understand not only how you turn on the immune system but also how you regulate it and turn it down when it's not needed. Sometimes, the over-exuberance of the immune response makes it difficult for a patient to recover. That's been true in COVID, and it's also true in some cases of West Nile virus infection.</p> <h2><strong class=\"arx-bold-text\">Have you had any surprising discoveries? </strong></h2> <p>I'm always excited and surprised when we discover something about how cells work. For example, in a young person, when cells get infected with West Nile virus, they bring down the level of one of the molecules that recognizes the virus receptors to avoid an over-exuberant immune response. However, in an older person, that level stays high, so the cells continue to progress in an activation pathway, which can be difficult for the patient. It’s a striking difference, and I didn’t expect it. </p> <h2><strong class=\"arx-bold-text\">Tell us about the future direction of your work.</strong></h2> <p>Our most recent project is centered on patients with sickle cell disease. We identify differences in the immune cell pathways at two different time points—at baseline and when they have a crisis. We then compare the responses to those of household contacts who don't have sickle cell disease. We want to understand which pathways are relevant to the difficulty in immune responses that these patients have. Quite a lot is understood about how you get sickle cell and what it means for your red blood cells, but there's little information on how the immune system works in that patient group. It’s an exciting new area.</p> <p>Every few years, there's a revolution in how we study cells, and we use the latest techniques when we move to a new project. We don't go back and repeat the old ways of doing things. Currently, we do single-cell RNA sequencing, and we also use a technique called CyTOF, a multi-parameter cell identification system that I launched at Yale in 2013. With CyTOF, we measure 50 parameters at the same time in the cell when we used to be limited to 8 or 10. And we not only look at what the cell is doing but also the environment. More and more now, if we can, we study the tissue of the host, not just the circulating blood. A lot of what goes on in immunity is in the tissues of the body. </p> <p>With each project, we learn new and more in-depth ways to study how the immune response works.</p> <p><em class=\"arx-italic-text\">The Department of Internal Medicine at Yale School of Medicine is among the nation's premier departments, bringing together an elite cadre of clinicians, investigators, educators, and staff in one of the world's top medical schools. To learn more, visit </em><a href=\"https://medicine.yale.edu/internal-medicine/\"><em class=\"arx-italic-text\">Internal Medicine.</em></a></p>","bylineDate":"2024-11-20T15:24:00Z","createdDate":"2024-11-20T00:00:00Z","submitter":"","sidebarTitle":null,"sidebarContent":null,"contact":null,"heroGallery":{"title":null,"description":null,"items":[{"galleryItemType":"image","mediaId":0,"data":{"title":"Ruth Montgomery, PhD","caption":null,"credit":null,"imageId":0,"url":"https://ysm-res.cloudinary.com/image/upload/v1/yms/prod/13fc265d-e0b3-4b04-a7da-6181daecfb5b","altText":"Ruth Montgomery, PhD","width":1500,"height":2250,"imageVariants":[{"dimension":"Square","url":"https://ysm-res.cloudinary.com/image/upload/c_crop,x_0,y_143,w_1500,h_1500/v1/yms/prod/13fc265d-e0b3-4b04-a7da-6181daecfb5b","width":1500,"height":1500,"aspectRatio":"ratio1x1"},{"dimension":"Rectangle","url":"https://ysm-res.cloudinary.com/image/upload/c_crop,x_0,y_183,w_1500,h_1029/v1/yms/prod/13fc265d-e0b3-4b04-a7da-6181daecfb5b","width":1500,"height":1029,"aspectRatio":"ratio3x2"}]}}]},"galleries":[],"authors":[{"name":"Serena Crawford","url":"/internal-medicine/profile/serena-crawford/#links-details-section"}],"tagLinks":[{"url":"/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=infectious%20diseases","text":"Infectious Diseases"},{"url":"/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=rheumatology","text":"Rheumatology"},{"url":"/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=internal%20medicine","text":"Internal Medicine"},{"url":"/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=faculty","text":"Faculty"},{"url":"/internal-medicine/search/?entityType=Article&articleSource=Ysm&articleSource=External&articleKeyword=aging","text":"Aging"}],"taggedProfiles":[{"id":63567,"name":"Ruth R Montgomery","organizationName":null,"image":{"imageId":0,"url":"https://ysm-res.cloudinary.com/image/upload/v1/yms/prod/9fea8409-5531-421a-99b5-d80db3b3592d","altText":"RuthMontgomeryProfile","width":1500,"height":2250,"imageVariants":[{"dimension":"Rectangle","url":"https://ysm-res.cloudinary.com/image/upload/v1/yms/prod/dfc24baf-8564-4079-b27a-edd32522a956","width":1500,"height":1875,"aspectRatio":"ratio4x5"},{"dimension":"Square","url":"https://ysm-res.cloudinary.com/image/upload/v1/yms/prod/b1505534-b611-44f8-9248-33cb39aef9b7","width":1500,"height":1500,"aspectRatio":"ratio1x1"}]},"url":"/internal-medicine/profile/ruth-montgomery/","suffixes":{"familySuffix":null,"nonFamilySuffixes":["PhD"]},"titles":["Professor of Medicine and Professor of Epidemiology (Microbial Diseases)","Associate Dean for Scientific Affairs, Dept Clinical: Internal Medicine"],"disabled":false,"isYsphMember":false,"isExternal":false}],"relatedLinks":[],"relatedDocumentLinks":[],"inlineMediaItems":[],"metaData":{"title":"How Does Aging Affect Innate Immunity?","description":"Worldwide, the population is getting older, so it’s imperative to understand the cell changes that come with age, stresses Ruth Montgomery, PhD, professor of medicine (rheumatology) and of epidemiology (microbial diseases) at Yale School of Medicine. “Older people are more susceptible to infectious diseases and less responsive to vaccines,” she said. 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For example, in a young person, when cells get infected with West Nile virus, they bring down the level of one of the molecules that recognizes the virus receptors to avoid an over-exuberant immune response. However, in an older person, that level stays high, so the cells continue to progress in an activation pathway, which can be difficult for the patient. It’s a striking difference, and I didn’t expect it. Tell us about the future direction of your work. Our most recent project is centered on patients with sickle cell disease. We identify differences in the immune cell pathways at two different time points—at baseline and when they have a crisis. We then compare the responses to those of household contacts who don't have sickle cell disease. We want to understand which pathways are relevant to the difficulty in immune responses that these patients have. 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