{"id":144370,"date":"2019-10-07T12:00:21","date_gmt":"2019-10-07T11:00:21","guid":{"rendered":"https:\/\/www.transcend.org\/tms\/?p=144370"},"modified":"2019-10-01T11:17:39","modified_gmt":"2019-10-01T10:17:39","slug":"antibiotic-resistance-researchers-have-directly-proven-that-bacteria-can-change-shape-inside-humans-to-avoid-antibiotics","status":"publish","type":"post","link":"https:\/\/www.transcend.org\/tms\/2019\/10\/antibiotic-resistance-researchers-have-directly-proven-that-bacteria-can-change-shape-inside-humans-to-avoid-antibiotics\/","title":{"rendered":"Antibiotic Resistance: Researchers Have Directly Proven that Bacteria Can Change Shape Inside Humans to Avoid Antibiotics"},"content":{"rendered":"
\"\"<\/a>

Researchers have evidence of another method that bacteria use to avoid antibiotics. 123RF.com<\/p><\/div>\n

30 Sep 2019 – <\/em>Widespread antibiotic use is largely to blame for the emergence of antibiotic resistant bacteria, which is currently one of the biggest threats<\/a> to global health. Not only does antibiotic resistance already cause an estimated 700,000 deaths a year<\/a>, it\u2019s also made numerous infections, including pneumonia, tuberculosis, and gonorrhoea, harder to treat<\/a>. Without knowing how to stop bacteria from developing antibiotic resistance, it\u2019s predicted that preventable diseases could cause 10m deaths a year<\/a> by 2050.<\/p>\n

Some of the ways that bacteria become resistant to antibiotics<\/a> is through changes in the bacteria\u2019s genome. For example, bacteria can pump the antibiotics out, or they can break the antibiotics down. They can also stop growing and divide, which makes them difficult to spot for the immune system.<\/p>\n

However, our research<\/a> has focused on another little known method that bacteria use to become antibiotic resistant. We have directly shown that bacteria can \u201cchange shape\u201d in the human body to avoid being targeted by antibiotics \u2013 a process that requires no genetic changes for the bacteria to continue growing.<\/p>\n

Virtually all bacteria are surrounded by a structure called the cell wall. The wall is like a thick jacket which protects against environmental stresses and prevents the cell from bursting. It gives bacteria a regular shape (for example, a rod or a sphere), and helps them divide efficiently.<\/p>\n

Human cells don\u2019t possess a cell wall (or \u201cjacket\u201d). Because of this, it\u2019s easy for the human immune system to recognise bacteria as an enemy because its cell wall is noticeably different. And, because the cell wall exists in bacteria but not in humans, it\u2019s an excellent target for some of our best and most commonly used antibiotics, such as penicillin. In other words, antibiotics targeting the wall can kill bacteria without harming us.<\/p>\n

However, bacteria can occasionally survive without their cell wall. If the surrounding conditions are able to protect the bacteria from bursting, they can turn into so-called \u201cL-forms\u201d, which are bacteria that don\u2019t have a cell wall. These bacteria were discovered in 1935 by Emmy Klieneberger-Nobel, who named them after the Lister Institute where she was working at the time.<\/p>\n

In a lab, we often use sugar to create a suitably protective environment. In the human body, this change in form is typically triggered by antibiotics that target the bacteria\u2019s cell wall, or certain immune molecules \u2013 such as lysozyme<\/a>, a molecule that\u2019s present in our tears which helps protect us from bacterial infections.<\/p>\n

Bacteria without a cell wall often become fragile and lose their regular shape. However, they also become partially invisible to our immune system, and completely resistant to all types of antibiotics that specifically target the cell wall.<\/p>\n

Scientists long suspected that L-form switching might contribute to recurrent infections by helping bacteria hide from the immune system and resist the antibiotics. However, it was difficult to find evidence for this theory due to the elusive nature of L-forms and lack of appropriate methods to detect them.<\/p>\n

Watching bacteria change shape<\/strong><\/p>\n

Our study<\/a>, published in Nature Communications, looked specifically at bacterial species associated with recurrent urinary tracts infections (UTIs). It found that many different bacterial species \u2013 including E. coli<\/em> and Enterococcus<\/em> \u2013 can indeed survive as L-forms in the human body. This is something that has never been directly proven before. We were able to detect these sneaky bacteria using fluorescent probes that recognise bacterial DNA.<\/p>\n

We tested urine samples from elderly patients with recurrent UTIs by growing them in a petri dish high in sugars. Not only did this environment help protect bacteria from bursting, it also isolated the L-form bacteria that were present in these samples. In a separate experiment, we were able to see the whole process take place in living zebrafish embryos in the presence of antibiotics.<\/p>\n

httpv:\/\/www.youtube.com\/watch?v=ckQs103lBJc
\nAfter the antibiotic was removed, the bacteria transformed back from L-forms to their regular form with cell walls. <\/strong>(Credit to Newcastle University, UK)<\/strong><\/p>\n

Importantly, our study shows that antibiotics need to be tested in conditions more reflective of the human body. The ones that are currently used in the medical laboratory don\u2019t provide enough protection for delicate L-forms to survive.<\/p>\n

Before we can fully understand how important L-form switching is compared to other forms of antibiotic resistance, further research using more patients will be needed. It will also be important to investigate what role L-forms may play in other recurrent infections, such as sepsis or pulmonary infections.<\/p>\n

Until now, research into L-forms has been a controversial field, but our hope is that these findings will motivate more research into L-forms in disease situations. Our hope is that these findings will help find a way to clear these sneaky bacteria from our body. Combining cell wall active antibiotics with ones that would kill L-forms might be one solution of fighting antibiotic resistant infections.<\/p>\n

Our battle with bacteria is ongoing. As we come up with new strategies to fight them, they come up with ways to fight back. Our study highlights yet another way that bacteria adapt that we\u2019ll need to take into account in our continuing battle with infectious disease.<\/p>\n

_________________________________________<\/em><\/p>\n

\"\"<\/a><\/em><\/p>\n

 <\/p>\n

Katarzyna Mickiewicz <\/a>– Newcastle University Research Fellow, Newcastle University <\/em><\/p>\n

 <\/p>\n

Republish our articles for free, online or in print, under Creative Commons license.<\/em><\/p>\n

Go to Original \u2013 theconversation.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

30 Sep 2019 – This breakthrough could be key in fighting antibiotic resistance.<\/p>\n","protected":false},"author":4,"featured_media":144372,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[145],"tags":[710,1447],"class_list":["post-144370","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-health","tag-science-and-medicine"],"_links":{"self":[{"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/posts\/144370","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/comments?post=144370"}],"version-history":[{"count":0,"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/posts\/144370\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/media\/144372"}],"wp:attachment":[{"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/media?parent=144370"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/categories?post=144370"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.transcend.org\/tms\/wp-json\/wp\/v2\/tags?post=144370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}