{"id":5523,"date":"2016-12-08T14:45:00","date_gmt":"2016-12-08T22:45:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/male-vs-female-stress-responses-may-explain-sex-differences-in-diseases\/"},"modified":"2023-04-19T11:10:21","modified_gmt":"2023-04-19T18:10:21","slug":"male-vs-female-stress-responses-may-explain-sex-differences-in-diseases","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/male-vs-female-stress-responses-may-explain-sex-differences-in-diseases\/","title":{"rendered":"Male vs. female stress responses may explain sex differences in diseases"},"content":{"rendered":"\n\n\n    \n            \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-2487-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-2487-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"Male vs. female stress responses may explain sex differences in diseases\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  The fruit fly genome sequence, which shares similarities with the human genome, is useful in many research labs. Photo by Christopher S. Newhard, Rensselaer Polytechnic Institute.\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=faculty\">Faculty<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>Male vs. female stress responses may explain sex differences in diseases<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  Findings from a study led by USC Dornsife\u2019s John Tower of biological sciences may explain how Alzheimer\u2019s and Parkinson\u2019s affect men and women differently.\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">Emily Gersema and Beth Newcomb<\/a><\/strong>\n    \n          <span class=\"post-date-field\">December 8, 2016<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        Share\n      <\/span>\n                        <a class=\"a2a_button_copy_link\" target=\"_blank\" href=\"\/#copy_link\" rel=\"nofollow noopener\" title=\"Link\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_copy_link\">\n              <svg height=\"19\" viewBox=\"0 0 19 19\" width=\"19\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m7.43475275 9.52380952-2.17490843 2.26076008c-1.08745421 1.058837-1.68841575 2.518315-1.68841575 4.0350275 0 1.5167124.60096154 2.9475732 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10.8c-1.087-2.114-4.046-6.053-6.798-7.995C2.566.944 1.561 1.266.902 1.565C.139 1.908 0 3.08 0 3.768c0 .69.378 5.65.624 6.479c.815 2.736 3.713 3.66 6.383 3.364c.136-.02.275-.039.415-.056c-.138.022-.276.04-.415.056c-3.912.58-7.387 2.005-2.83 7.078c5.013 5.19 6.87-1.113 7.823-4.308c.953 3.195 2.05 9.271 7.733 4.308c4.267-4.308 1.172-6.498-2.74-7.078a8.741 8.741 0 0 1-.415-.056c.14.017.279.036.415.056c2.67.297 5.568-.628 6.383-3.364c.246-.828.624-5.79.624-6.478c0-.69-.139-1.861-.902-2.206c-.659-.298-1.664-.62-4.3 1.24C16.046 4.748 13.087 8.687 12 10.8\"  fill-rule=\"evenodd\" \/>\n              <\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Bluesky<\/span>\n          <\/a>\n                                <a class=\"a2a_button_email\" target=\"_blank\" href=\"\/#email\" rel=\"nofollow noopener\" title=\"E-mail\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_print\">\n              <svg height=\"12\" viewBox=\"0 0 18 12\" width=\"18\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m8.14285714 9.42857143c-.17142857 0-.34285714 0-.51428571.08571428l7.28571427 6.34285719c.3428572.2571428.6857143.2571428.9428572 0l7.2857142-6.34285719c-.0857142-.08571428-.2571428-.08571428-.4285714-.08571428zm-1.28571428 1.11428567v.1714286 8.5714286c0 .6857143.6 1.2857143 1.28571428 1.2857143h14.57142856c.6857143 0 1.2857143-.6 1.2857143-1.2857143v-8.5714286c0-.0857143 0-.0857143 0-.1714286l-7.2 6.3428572c-.7714286.6857143-1.8857143.6857143-2.6571429 0z\" fill-rule=\"evenodd\" transform=\"translate(-6 -9)\"\/><\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n  \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>The differences in how male and female fruit flies resist and adapt to oxidative stress may shed new light on how age-related diseases such as Alzheimer&rsquo;s and Parkinson&rsquo;s affect men and women differently.<\/p>\n<p>Through a series of tests, USC researchers found that female fruit flies were better able to respond to stress caused by a common oxidant, hydrogen peroxide (produced naturally in the body for cell signaling and to combat infection), than males. However, males were better able to adapt to another oxidant, paraquat, a common herbicide.<\/p>\n<p>Both oxidants have been implicated in human diseases. Elevated levels of hydrogen peroxide are found in patients suffering from a stroke, a heart attack or Alzheimer&rsquo;s disease. Paraquat is one of the environmental toxins that can damage the neurons involved in Parkinson&rsquo;s disease, which attacks the nervous system.<\/p>\n<p>The male and female responses to the stress seem to differ in part because of a protein, Lon protease, found in mitochondria, the researchers revealed.<\/p>\n<p><strong>Basic similarities<\/strong><\/p>\n<p>Fruit flies share many fundamental similarities with humans, including the gene for this protective protein, which helps cells respond to oxidative stress, said corresponding author <a href=\"https:\/\/dornsife.usc.edu\/cf\/faculty-and-staff\/faculty.cfm?pid=1003772\" target=\"_blank\">John Tower<\/a>, professor of <a href=\"https:\/\/dornsife.usc.edu\/bisc\/\">biological sciences<\/a>&nbsp;at&nbsp; USC Dornsife.<\/p>\n<p>Oxidative stress occurs when unstable, uncharged molecules &mdash; free radicals &mdash; overwhelm the body&rsquo;s antioxidants, then react with other substances to damage cells or generate abnormal ones. The damage from this stress accumulates with age.<\/p>\n<p>&ldquo;The Lon protease breaks down proteins that are damaged by oxidative stress, and it protects cells from the damaged proteins&rsquo; ill effects,&rdquo; Tower said.<\/p>\n<p>The researchers&rsquo; findings, published in the journal <em>Current Biology<\/em> on Dec. 1, indicate the need for further investigation into sex-based differences in the biological responses of men and women, particularly as scientists consider new ways to treat age-related diseases, Tower said.<\/p>\n<div class=\"news-image-landscape news-image-right\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/sites\/7\/migration-uploads\/Tower2-2487.jpg\" alt=\"Landscape Right\"><\/p>\n<p>Professor of Biological Sciences John Tower. Photo by Gus Ruelas.<\/p>\n<\/div>\n<p>&ldquo;Many of the illnesses related to oxidative stress have different prevalence rates between men and women,&rdquo; he said. &ldquo;For instance, Alzheimer&rsquo;s disease and diabetes-related heart disease affects more women than men, while Parkinson&rsquo;s disease and cancer affect more men than women.&rdquo;<\/p>\n<p>In both flies and humans, Lon protease is found in the mitochondria, the capsule-like organelles deemed the powerhouse of cells that convert nutrients into energy. Mitochondria contain their own DNA and are inherited from the mother. Increasingly, they are the focus of age-related research as scientists have uncovered links between mitochondrial function and cardiovascular disease, diabetes, Alzheimer&rsquo;s and Parkinson&rsquo;s and other diseases, Tower said.<\/p>\n<p>&ldquo;Many human diseases involve chronic oxidative stress, and mitochondria are the main source,&rdquo; Tower said.<\/p>\n<p><strong>Stress test<\/strong><\/p>\n<p>To test the flies&rsquo; resistance to oxidative stress, researchers first exposed them to small amounts of one of two common oxidants &mdash; hydrogen peroxide or paraquat.<\/p>\n<p>If the flies developed resistance to the oxidant by producing more Lon protease, they could survive larger, semi-lethal doses of the chemical. The team found that only the female flies could adapt to hydrogen peroxide exposure, while only the male flies could resist the heavier paraquat dose.<\/p>\n<p>To confirm the role of sex in the different responses, researchers genetically manipulated male flies to develop into &ldquo;pseudo-females&rdquo; with female body characteristics. These pseudo-female flies adapted to hydrogen peroxide but not paraquat, indicating the same resistance as the natural female flies.<\/p>\n<p>Illustrating a possible reason for the sex discrepancy, the researchers characterized key differences in the Lon protease between the sexes. Female flies expressed an extra version, or isoform, of the protein that varied in size compared to the isoforms shared between the sexes. Sex-specific expression of Lon protein isoforms was also observed in mouse tissues.<\/p>\n<p>&ldquo;These different-size Lon isoforms may help regulate sex-specific stress resistance,&rdquo; Tower said.<\/p>\n<p>The authors offered a few hypotheses as reasons for the differences in male and female responses to hydrogen peroxide. For instance, because mitochondria are inherited from the mother, it&rsquo;s possible that natural selection only optimizes the function and interactions of mitochondrial genes in females, they wrote. Females may have evolved to better respond to hydrogen peroxide because it is a normal signaling molecule produced by mitochondria.<\/p>\n<p>The researchers also offered possible explanations for the males&rsquo; adaptation and resistance to paraquat. Males express greater dopamine receptor levels, which may have helped them adapt to oxidative stress from paraquat. While that response may help them adapt to low stress, however, it may make them a more vulnerable target to toxic stress, such as Parkinson&rsquo;s disease.<\/p>\n<p>Tower&rsquo;s co-authors on the study included Matthew P. Salomon of USC Dornsife and the John Wayne Cancer Institute at Providence Saint John&rsquo;s Health Center in Santa Monica, Calif. &nbsp;Other study authors were Laura C. D. Pomatto, Caroline Carney, Brenda Shen, Sarah Wong, Kelly Halaszynski, and Kelvin J. A. Davies, all of <a href=\"http:\/\/gero.usc.edu\/\" target=\"_blank\">USC Leonard Davis School of Gerontology<\/a>.<\/p>\n<p>The research was funded by the National Science Foundation (grant DGE-1418060) and the National Institutes of Health\/National Institute of Environmental Health Sciences (grant ES03598), the NIH\/National Institute on Aging (grant AG011833) and pilot funding from the Southern California Environmental Health Sciences Center (grant 5P30ES007048).<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Findings from a study led by USC Dornsife\u2019s John Tower of biological sciences may explain how Alzheimer\u2019s and Parkinson\u2019s affect men and women differently.<\/p>\n","protected":false},"author":0,"featured_media":5526,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[283,117,615,96,1007],"class_list":["post-5523","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faculty","tag-alzheimers","tag-biology","tag-john-tower","tag-natural-sciences","tag-parkinsons-disease"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Male vs. female stress responses may explain sex differences in diseases<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/news\/stories\/male-vs-female-stress-responses-may-explain-sex-differences-in-diseases\/\" \/>\n<meta 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