{"id":50586,"date":"2021-04-23T11:22:12","date_gmt":"2021-04-23T09:22:12","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=50586"},"modified":"2023-02-17T15:09:23","modified_gmt":"2023-02-17T14:09:23","slug":"how-oxygen-radicals-protect-against-cancer","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/how-oxygen-radicals-protect-against-cancer\/","title":{"rendered":"How oxygen radicals protect against cancer"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2021\/04\/Beitragsbild_Sauerstoffradikale.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"650\" height=\"450\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2021\/04\/Beitragsbild_Sauerstoffradikale.jpg\" alt=\"\" class=\"wp-image-50584\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2021\/04\/Beitragsbild_Sauerstoffradikale.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2021\/04\/Beitragsbild_Sauerstoffradikale-300x208.jpg 300w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><\/a><figcaption>Low concentrations of cellular hydrogen peroxide may prevent a cell from becoming cancerous. (Picture: Illustration Forest\/Shutterstock)<\/figcaption><\/figure><\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Oxygen radicals in the body are generally considered dangerous because they can trigger something called oxidative stress, which is associated with the development of many chronic diseases such as cancer and cardiovascular disease. In studies on mice, scientists at Goethe University Frankfurt have now discovered how oxygen radicals, conversely, can also reduce the risk of cancer and mitigate damage to the hereditary molecule DNA. &nbsp;(PNAS, DOI 10.1073\/pnas.2020152118).<\/strong><\/p>\n\n\n\n<p>Originally, oxygen radicals &#8211; reactive oxygen species, or ROS for short &#8211; were considered to be exclusively harmful in the body. They are produced, for example, by smoking or UV radiation. Because of their high reactivity, they can damage many important molecules in cells, including the hereditary molecule DNA. As a result, there is a risk of inflammatory reactions and the degeneration of affected cells into cancer cells.<\/p>\n\n\n\n<p>Because of their damaging effect, however, ROS are also deliberately produced by the body, for example by immune or lung epithelial cells, which destroy invading bacteria and viruses with ROS. This requires relatively high ROS concentrations. In low concentrations, on the other hand, ROS play an important role as signalling molecules. For these tasks, ROS are specifically produced by a whole group of enzymes. One representative of this group of enzymes is Nox4, which continuously produces small amounts of H<sub>2<\/sub>O<sub>2.<\/sub> Nox4 is found in almost all body cells, where its product H<sub>2<\/sub>O<sub>2<\/sub> maintains a large number of specialised signaling functions, contributing, for example, to the inhibition of inflammatory reactions.<\/p>\n\n\n\n<p>Researchers at Goethe University Frankfurt, led by Professor Katrin Schr\u00f6der, have now discovered that by producing H<sub>2<\/sub>O<sub>2, <\/sub>Nox4 can even prevent the development of cancer. They examined mice that were unable to produce Nox4 due to a genetic modification. When these mice were exposed to a carcinogenic environmental toxin (cancerogen), the probability that they would develop a tumour doubled. Since the mice suffered from very different types of tumours such as skin sarcomas and colon carcinomas, the researchers suspected that Nox4 has a fundamental influence on cellular health.<\/p>\n\n\n\n<p>Molecular investigations showed that the H<sub>2<\/sub>O<sub>2<\/sub> formed by Nox4 keeps a cascade going that prevents certain important signalling proteins (phosphatases) from entering the cell nucleus. If Nox4 and consequently H<sub>2<\/sub>O<sub>2 <\/sub>are absent, those signalling proteins migrate into the cell nucleus and as a consequence, severe DNA damage is hardly recognised.<\/p>\n\n\n\n<p>Severe DNA damage &#8211; e.g. double strand breaks &#8211; occurs somewhere in the body every day. Cells react very sensitively to such DNA damage, setting a whole repertoire of repair enzymes in motion. If this does not help, the cell activates its cell death programme &#8211; a precautionary measure of the body against cancer. When such damage goes unrecognised, as occurs in the absence of Nox4, it spurs cancer formation.<\/p>\n\n\n\n<p>Prof. Katrin Schr\u00f6der explains the research results: &#8222;If Nox4 is missing and there is therefore no H<sub>2<\/sub>O<sub>2<\/sub>, the cells no longer recognise DNA damage. Mutations accumulate and damaged cells continue to multiply. If an environmental toxin is added that massively damages the DNA, the damage is no longer recognised and repaired. The affected cells are not eliminated either, but multiply, sometimes very quickly and uncontrollably, which eventually leads to the development of tumours. A small amount of H<sub>2<\/sub>O<sub>2<\/sub> thus maintains an internal balance in the cell that protects the cells from degeneration.&#8220;<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#eeeeee\"><strong>Publication: <\/strong>Valeska Helfinger, Florian Freiherr von Gall, Nina Henke, Michael M. Kunze, Tobias Schmid, Flavia Rezende, Juliana Heidler, Ilka Wittig, Heinfried H. Radeke, Viola Marschall, Karen Anderson, Ajay M. Shah, Simone Fulda, Bernhard Br\u00fcne, Ralf P. Brandes, Katrin Schr\u00f6der:<strong> Genetic deletion of Nox4 enhances cancerogen-induced formation of solid tumors. <\/strong>PNAS, <a href=\"https:\/\/doi.org\/10.1073\/pnas.2020152118\">https:\/\/doi.org\/10.1073\/pnas.2020152118<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Oxygen radicals in the body are generally considered dangerous because they can trigger something called oxidative stress, which is associated with the development of many chronic diseases such as cancer [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":50584,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[247],"post_folder":[],"class_list":["post-50586","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-medicine"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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