Breaking News
August 21, 2018 - Clinical Trials Balance Out Urban, Rural Cancer Survival Rates
August 21, 2018 - New target found for treating thoracic aortic aneurysm
August 21, 2018 - Tumor cells’ ‘tells’ may allow some cancer patients to dodge unnecessary chemotherapy
August 21, 2018 - Dehydration changes shape and activity of the brain, reduces task performance
August 21, 2018 - Scientists discover peptides that can be used as new antibiotic candidates
August 21, 2018 - ‘Compulsivity circuit’ may drive alcohol-seeking behavior in heavy drinkers
August 21, 2018 - Type 2 diabetes on the rise among youngsters
August 21, 2018 - Genital warts may promote HIV sexual transmission
August 21, 2018 - Drop the C-word to reduce anxiety and overtreatment, say experts
August 21, 2018 - Kid-friendly MRI equipment has advantages for grown-ups, too
August 21, 2018 - Scleroderma Foundation names Tulane professor as ‘Doctor of the Year’
August 21, 2018 - Chagas disease causes chronic heart disease and has spread outside of Latin America
August 21, 2018 - FDA stirs debate by approving ‘natural’ app
August 21, 2018 - Clay may help fight disease-causing bacteria in wounds
August 21, 2018 - Emerging field of diabetology could address growing crisis in health care
August 21, 2018 - Experts examine stool protein biomarkers that indicate inflammatory bowel disease
August 21, 2018 - Orphazyme Announces Enrollment of First Patient in Phase III Clinical Trial of Arimoclomol for ALS
August 21, 2018 - Ovarian cancer cells hoard iron to fuel growth
August 21, 2018 - New Biodesign fellows will focus on vision care
August 21, 2018 - Prenatal DDT Exposure Associated with Greater Risk of Autism
August 21, 2018 - Cruciferous vegetables found to protect against colon cancer in mice
August 21, 2018 - New studies point to a promising future for bioengineered teeth
August 21, 2018 - ACR expresses concerns on step therapy in a recent meeting with HSS Secretary
August 21, 2018 - Gene therapy with telomerase does not increase cancer risk, study shows
August 21, 2018 - Ovarian cancer screening influenced by unconscious bias, study shows
August 21, 2018 - Scientists report novel gene therapy that halts vision loss in canine model of blinding disease
August 21, 2018 - RxBenefits introduces new tailored and flexible approach to managing hospital pharmacy benefits
August 21, 2018 - Motif Bio Announces FDA Acceptance of New Drug Application With Priority Review for Iclaprim for Treatment of Acute Bacterial Skin and Skin Structure Infections
August 21, 2018 - Google Glass helps kids with autism read facial expressions, study finds
August 21, 2018 - Thrombospondin-1 contributes to development of aortic aneurysm in mice and humans, study finds
August 21, 2018 - National Foundation for Cancer Research receives Safeway Foundation grant
August 21, 2018 - Protein aggregation in neurons linked to gene regulation in Huntington’s disease
August 21, 2018 - Aravive Biologics gains Fast Track Designation for AVB-S6-500 from U.S. FDA
August 21, 2018 - FDA Approves Opdivo (nivolumab) for Certain Patients with Previously Treated Small Cell Lung Cancer
August 21, 2018 - Success of blood test for autism affirmed
August 21, 2018 - Diabetic patients with disrupted sleep may need more time to heal their wounds
August 21, 2018 - AADE honors six educators for achievements in diabetes education
August 21, 2018 - Scientists find two molecules that may combat cancer and chronic infections
August 21, 2018 - Two Strategies for Preventing Diabetes in Minority Patients
August 21, 2018 - Living as a Gallbladder Cancer Survivor
August 21, 2018 - Can we predict the long-term outcome of boys with ADHD?
August 21, 2018 - GBCA creates model for developing scientist-advocate collaborations in cancer research
August 21, 2018 - Healthy diet could help promote healthy cellular aging in women
August 21, 2018 - Researchers develop gene expression predictor for immunotherapy response in melanoma
August 21, 2018 - Genome sequences of ape parasites provide insights on origin and early evolution of malaria
August 21, 2018 - MDI Biological Laboratory introduces Morris Scientific Discovery Fund for eligible research programs
August 21, 2018 - Pediatric brain tumor patients who undergo radiation less likely to recall recently experienced events
August 21, 2018 - Micro-flow model reveals complex interactions between the brain’s blood vessels and nerve cells
August 21, 2018 - Study investigates impact of osteoporosis on risk of developing dementia
August 21, 2018 - Federal method fails to detect most stores that sell cigarettes to minors
August 21, 2018 - Workers in open office seating have less stress than those in private offices and cubicles
August 21, 2018 - 1 in 4 in U.S. Has a Disability, CDC Reports
August 21, 2018 - Studies provide new insights into the role of sleep in chronic pain
August 21, 2018 - Study shows that rogue proteins may underlie some ALS and frontotemporal dementia cases
August 21, 2018 - Elevated LDL cholesterol levels linked to higher risk of CVD death in young, healthy people
August 21, 2018 - Measles cases on the rise in Europe
August 21, 2018 - CURE Media Group welcomes CancerCare to Strategic Alliance Partnership Program
August 21, 2018 - Blood management program associated with fewer transfusions in orthopedic patients
August 21, 2018 - Researchers create the world’s first artificial retina
August 21, 2018 - Yale researchers identify racial disparities in prescribing opioids for chronic pain
August 21, 2018 - BOOST-3 clinical trial aims to improve outcomes for severe TBI patients
August 21, 2018 - New study highlights Alzheimer’s herpes link, experts say
August 21, 2018 - Airline crew don’t have significantly elevated risk of thyroid cancer, new study finds
August 21, 2018 - States leverage federal funds to help insurers lower premiums
August 21, 2018 - New badge course explores research around skeletal muscle as an endocrine organ
August 21, 2018 - TG Therapeutics Announces Completion of Target Enrollment in the ULTIMATE Phase 3 Trials in Multiple Sclerosis
August 21, 2018 - Increased levels of human herpesvirus ID’d in Alzheimer’s
August 21, 2018 - To help patients quash pain, researcher develops practical guide for health care providers
August 20, 2018 - Medicine on the front line to be presented at Medical Innovation 2018
August 20, 2018 - Harbour Biomed and Kelun-Biotech collaborate to develop, commercialize anti-PD-L1 antibody
August 20, 2018 - The man who sold America on vitamin D — and profited in the process
August 20, 2018 - Finding the light in antimicrobials
August 20, 2018 - Unique pain program helps surgical patients wean off opioids safely and effectively
August 20, 2018 - Strawberries could mitigate colonic inflammation
August 20, 2018 - FDA Accepts New Drug Application (NDA) to Review Midazolam Nasal Spray, an Investigational Product for the Acute Treatment of Seizure Clusters
August 20, 2018 - Using Facebook to help young adults quit smoking
August 20, 2018 - ‘Liquid biopsy’ predicts lymphoma therapy success within days | News Center
August 20, 2018 - 5 Questions with Jordan Orange, Chair of Pediatrics
August 20, 2018 - New assay may help improve both sarcoma diagnosis and treatment
August 20, 2018 - New information on the brain regions related to metacognition, tactile sense
Researchers propose different approach to beat antibiotic-resistant superbugs

Researchers propose different approach to beat antibiotic-resistant superbugs

image_pdfDownload PDFimage_print

Got a sore throat? The doctor may write a quick prescription for penicillin or amoxicillin, and with the stroke of a pen help diminish public health and your own future health by helping bacteria evolve resistance to antibiotics.

It’s time to develop alternatives to antibiotics for small infections, according to a new thought paper by scientists at the Georgia Institute of Technology, and to do so quickly. It has been widely reported that bacteria will evolve to render antibiotics mostly ineffective by mid-century, and current strategies to make up for the projected shortfalls haven’t worked.

One possible problem is that drug development strategies have focused on replacing antibiotics in extreme infections, such as sepsis, where every minute without an effective drug increases the risk of death. But the evolutionary process that brings forth antibiotic resistance doesn’t happen nearly as often in those big infections as it does in the multitude of small ones like sinusitis, tonsillitis, bronchitis, and bladder infections, the Georgia Tech researchers said.

“Antibiotic prescriptions against those smaller ailments account for about 90 percent of antibiotic use, and so are likely to be the major driver of resistance evolution,” said Sam Brown, an associate professor in Georgia Tech’s School of Biological Sciences. Bacteria that survive these many small battles against antibiotics grow in strength and numbers to become formidable armies in big infections, like those that strike after surgery.

“It might make more sense to give antibiotics less often and preserve their effectiveness for when they’re really needed. And develop alternate treatments for the small infections,” Brown said.

Brown, who specializes in the evolution of microbes and in bacterial virulence, and first author Kristofer Wollein Waldetoft, a medical doctor and postdoctoral research assistant in Brown’s lab, published an essay detailing their suggestion for refocusing the development of bacteria-fighting drugs on December 28, 2017, in the journal PLOS Biology.

Duplicitous antibiotics

The evolution of antibiotic resistance can be downright two-faced.

“If you or your kid go to the doctor with an upper respiratory infection, you often get amoxicillin, which is a relatively broad-spectrum antibiotic,” Brown said. “So, it kills not only strep but also a lot of other bacteria, including in places like the digestive tract, and that has quite broad impacts.”

E. coli is widespread in the human gut, and some strains secrete enzymes that thwart antibiotics, while other strains don’t. A broad-spectrum antibiotic can kill off more of the vulnerable, less dangerous bacteria, leaving the more dangerous and robust bacteria to propagate.

“You take an antibiotic to go after that thing in your throat, and you end up with gut bacteria that are super-resistant,” Brown said. “Then later, if you have to have surgery, you have a problem. Or you give that resistant E. coli to an elderly relative.”

Much too often, superbugs have made their way into hospitals in someone’s intestines, where they had evolved high resistance through years of occasional treatment with antibiotics for small infections. Then those bacteria have infected patients with weak immune systems.

Furious infections have ensued, essentially invulnerable to antibiotics, followed by sepsis and death.

Alternatives get an “F”

Drug developers facing dwindling antibiotic effectiveness against evolved bacteria have looked for multiple alternate treatments. The focus has often been to find some new class of drug that works as well as or better than antibiotics, but so far, nothing has, Brown said.

Wollein Waldetoft came across a research paper in the medical journal Lancet Infectious Diseases that examined study after study on such alternate treatments against big, deadly infections.

“It was a kind of scorecard, and it was almost uniformly negative,” Brown said. “These alternate therapies, such as phage or anti-virulence drugs or, bacteriocins — you name it — just didn’t rise to the same bar of efficacy that existing antibiotics did.”

“It was a type of doom and gloom paper that said once the antibiotics are gone, we’re in trouble,” Brown said. “Drug companies still are investing in alternate drug research, because it has gotten very, very hard to develop new effective antibiotics. We don’t have a lot of other options.”

But the focus on new treatments for extreme infections has bothered the researchers because the main arena where the vast portion of resistance evolution occurs is in small infections. “We felt like there was a disconnect going on here,” Brown said.

Don’t kill strep, beat it

The researchers proposed a different approach: “Take the easier tasks, like sore throats, off of antibiotics and reserve antibiotics for these really serious conditions.”

Developing non-antibiotic therapies for strep throat, bladder infections, and bronchitis could prove easier, thus encouraging pharmaceutical investment and research.

For example, one particular kind of strep bacteria, group A streptococci, is responsible for the vast majority of bacterial upper respiratory infections. People often carry it without it breaking out.

Strep bacteria secrete compounds that promote inflammation and bacterial spread. If an anti-virulence drug could fight the secretions, the drug could knock back the strep into being present but not sickening.

Brown cautioned that strep infection can lead to rheumatic heart disease, a deadly condition that is very rare in the industrialized world, but it still takes a toll in other parts of the world. “A less powerful drug can be good enough if you don’t have serious strep throat issues in your medical history,” he said.

Sometimes, all it takes is some push-back against virulent bacteria until the body’s immune system can take care of it. Developing a spray-on treatment with bacteriophages, viruses that attack bacteria, might possibly do the trick.

If doctors had enough alternatives to antibiotics for the multitude of small infections they treat, they could help preserve antibiotic effectiveness longer for the far less common but much more deadly infections, for which they’re most needed.

Source:

http://www.rh.gatech.edu/news/600252/want-beat-antibiotic-resistant-superbugs-rethink-strep-throat-remedies

Tagged with:

About author

Related Articles