Breaking News
May 3, 2019 - Vaping and Smoking May Signal Greater Motivation to Quit
May 3, 2019 - Dementia looks different in brains of Hispanics
May 3, 2019 - Short-Staffed Nursing Homes See Drop In Medicare Ratings
May 3, 2019 - Study of teens with eating disorders explores how substance users differ from non-substance users
May 3, 2019 - Scientists develop new video game that may help in the study of Alzheimer’s
May 3, 2019 - Arc Bio introduces Galileo Pathogen Solution product line at ASM Clinical Virology Symposium
May 3, 2019 - Cornell University study uncovers relationship between starch digestion gene and gut bacteria
May 3, 2019 - How to Safely Use Glucose Meters and Test Strips for Diabetes
May 3, 2019 - Anti-inflammatory drugs ineffective for prevention of Alzheimer’s disease
May 3, 2019 - Study tracks Pennsylvania’s oil and gas waste-disposal practices
May 3, 2019 - Creating a better radiation diagnostic test for astronauts
May 3, 2019 - Vegans are often deficient in these four nutrients
May 3, 2019 - PPDC announces seed grants to develop medical devices for children
May 3, 2019 - Study maps out the frequency and impact of water polo head injuries
May 3, 2019 - Research on Reddit identifies risks associated with unproven treatments for opioid addiction
May 3, 2019 - Good smells may help ease tobacco cravings
May 3, 2019 - Medical financial hardship found to be very common among people in the United States
May 3, 2019 - Researchers develop multimodal system for personalized post-stroke rehabilitation
May 3, 2019 - Study shows significant mortality benefit with CABG over percutaneous coronary intervention
May 3, 2019 - Will gene-editing of human embryos ever be justifiable?
May 3, 2019 - FDA Approves Dengvaxia (dengue vaccine) for the Prevention of Dengue Disease in Endemic Regions
May 3, 2019 - Why Tonsillitis Keeps Coming Back
May 3, 2019 - Fighting the opioid epidemic with data
May 3, 2019 - Maggot sausages may soon be a reality
May 3, 2019 - Deletion of ATDC gene prevents development of pancreatic cancer in mice
May 2, 2019 - Targeted Therapy Promising for Rare Hematologic Cancer
May 2, 2019 - Alzheimer’s disease is a ‘double-prion disorder,’ study shows
May 2, 2019 - Reservoir bugs: How one bacterial menace makes its home in the human stomach
May 2, 2019 - Clinical, Admin Staff From Cardiology Get Sneak Peek at Epic
May 2, 2019 - Depression increases hospital use and mortality in children
May 2, 2019 - Vicon and NOC support CURE International to create first gait lab in Ethiopia
May 2, 2019 - Researchers use 3D printer to make paper organs
May 2, 2019 - Viral infection in utero associated with behavioral abnormalities in offspring
May 2, 2019 - U.S. Teen Opioid Deaths Soaring
May 2, 2019 - Opioid distribution data should be public
May 2, 2019 - In the Spotlight: “I’m learning every single day”
May 2, 2019 - 2019 Schaefer Scholars Announced
May 2, 2019 - Podcast: KHN’s ‘What The Health?’ Bye-Bye, ACA, And Hello ‘Medicare-For-All’?
May 2, 2019 - Study describes new viral molecular evasion mechanism used by cytomegalovirus
May 2, 2019 - SLU study suggests a more equitable way for Medicare reimbursement
May 2, 2019 - Scientists discover first gene involved in lower urinary tract obstruction
May 2, 2019 - Researchers identify 34 genes associated with increased risk of ovarian cancer
May 2, 2019 - Many low-income infants receive formula in the first few days of life, finds study
May 2, 2019 - Global study finds high success rate for hip and knee replacements
May 2, 2019 - Taking depression seriously: What is it?
May 2, 2019 - With Head Injuries Mounting, Will Cities Put Their Feet Down On E-Scooters?
May 2, 2019 - Scientists develop small fluorophores for tracking metabolites in living cells
May 2, 2019 - Study casts new light into how mothers’ and babies’ genes influence birth weight
May 2, 2019 - Researchers uncover new brain mechanisms regulating body weight
May 2, 2019 - Organ-on-chip systems offered to Asia-Pacific regions by Sydney’s AXT
May 2, 2019 - Adoption of new rules drops readmission penalties against safety net hospitals
May 2, 2019 - Kids and teens who consume zero-calorie sweetened beverages do not save calories
May 2, 2019 - Improved procedure for cancer-related erectile dysfunction
May 2, 2019 - Hormone may improve social behavior in autism
May 2, 2019 - Alzheimer’s disease may be caused by infectious proteins called prions
May 2, 2019 - Even Doctors Can’t Navigate Our ‘Broken Health Care System’
May 2, 2019 - Study looks at the impact on criminal persistence of head injuries
May 2, 2019 - Honey ‘as high in sugars as table sugar’
May 2, 2019 - Innovations to U.S. food system could help consumers in choosing healthy foods
May 2, 2019 - FDA Approves Mavyret (glecaprevir and pibrentasvir) as First Treatment for All Genotypes of Hepatitis C in Pediatric Patients
May 2, 2019 - Women underreport prevalence and intensity of their own snoring
May 2, 2019 - Concussion summit focuses on science behind brain injury
May 2, 2019 - Booker’s Argument For Environmental Justice Stays Within The Lines
May 2, 2019 - Cornell research explains increased metastatic cancer risk in diabetics
May 2, 2019 - Mount Sinai study provides fresh insights into cellular pathways that cause cancer
May 2, 2019 - Researchers to study link between prenatal pesticide exposures and childhood ADHD
May 2, 2019 - CoGEN Congress 2019: Speakers’ overviews
May 2, 2019 - A new strategy for managing diabetic macular edema in people with good vision
May 2, 2019 - Sagent Pharmaceuticals Issues Voluntary Nationwide Recall of Ketorolac Tromethamine Injection, USP, 60mg/2mL (30mg per mL) Due to Lack of Sterility Assurance
May 2, 2019 - Screen time associated with behavioral problems in preschoolers
May 2, 2019 - Hormone reduces social impairment in kids with autism | News Center
May 2, 2019 - Researchers synthesize peroxidase-mimicking nanozyme with low cost and superior catalytic activity
May 2, 2019 - Study results of a potential drug to treat Type 2 diabetes in children announced
May 2, 2019 - Multigene test helps doctors to make effective treatment decisions for breast cancer patients
May 2, 2019 - UNC School of Medicine initiative providing unique care to dementia patients
May 2, 2019 - Nestlé Health Science and VHP join forces to launch innovative COPES program for cancer patients
May 2, 2019 - Study examines how our brain generates consciousness and loses it during anesthesia
May 2, 2019 - Transition Support Program May Aid Young Adults With Type 1 Diabetes
May 2, 2019 - Study shows how neutrophils exacerbate atherosclerosis by inducing smooth muscle-cell death
May 2, 2019 - Research reveals complexity of how we make decisions
Novel delivery system for bacteriophages could offer new way to battle lung infections

Novel delivery system for bacteriophages could offer new way to battle lung infections

A new delivery system for bacteriophages-;viruses that selectively attack harmful bacteria-;could help give doctors a new way to battle lung infections that threaten older patients and people with cystic fibrosis.

Phage therapy is a promising alternative to antibiotics because it attacks specific pathogens, does not harm the body’s normal contingent of bacteria and won’t contribute to multi-drug resistance. However, therapeutic bacteriophages can be difficult to purify and challenging to deliver to the site of an infection, especially when that location is the lungs.

A research team headed by the Georgia Institute of Technology has demonstrated a new delivery technique that uses dry, porous microparticles coated with phages. In animal testing, the phage-coated polymer particles successfully treated pneumonia in infected mice and dramatically reduced bacterial levels in an animal model of cystic fibrosis. The technique might one day allow delivery of the dry-powder phage using a device similar to a common inhaler.

Reported July 16 in the journal Nature Biomedical Engineering, the research was supported by the National Institutes of Health and The Children’s Healthcare of Atlanta Pediatric Technology Center, a partnership between Georgia Tech and Children’s Healthcare of Atlanta.

“Phage delivery is an area where the right type of material could make a difference in therapeutic applications,” said Andrés García, the Rae S. and Frank H. Neely Chair and Regents’ Professor in Georgia Tech’s George W. Woodruff School of Mechanical Engineering. “We set out to engineer a biomaterial carrier that would keep the phage active while delivering them deep into the lungs in a uniform fashion. This is a key step in moving this potential therapy forward.”

Phage therapy has generated more interest as concerns about antibiotic use has grown. Specific bacteriophages can target bacteria such as Pseudomonas aeruginosa – which causes some forms of pneumonia and is the major pathogenic bacteria in cystic fibrosis – without affecting other bacteria. Phage activity propagates beyond the coated particles, but is limited by the host population, so once the targeted bacteria are eliminated, the phage disappear.

Researchers have previously used a nebulizer to deliver wet phage mixtures to the lungs, but that approach is inefficient and inconvenient for patients. As an alternative, García and his collaborators developed a microparticle carrier made from the same polymer material used in dissolving sutures. They made the porous particles large enough to avoid rapid clearance by the body, but light enough to be delivered deep into the lungs.

The phage are incubated on the particles, then dried. When introduced into animal lungs as a puff of dry powder, the phage begin attacking the bacteria. For mice infected with pneumonia, the phage carried on the particles cleared the infection – while untreated mice died. A significant reduction in bacterial populations was observed in transgenic mice whose lungs simulated conditions typical of cystic fibrosis.

“When we immobilized the phage on the particles, we could retain good activity for days – as long as two weeks at room temperature,” García said. “We could store these particles, and when we delivered them to mice, get good distribution through the lungs. We believe the particles help stabilize the phage and improve the distribution in the lungs.”

Nael McCarty, Marcus Professor of Cystic Fibrosis and director of the Emory+Children’s Cystic Fibrosis Center of Excellence at Emory University and Children’s Healthcare of Atlanta, and one of the study’s co-authors, said the development of the delivery technique potentially advances the use of phage in treatment of cystic fibrosis.

“Cystic fibrosis is a common, life-limiting genetic disorder that affects many organ systems, but the most important impact on human health is chronic infections of the lung. Bacterial pneumonia that is resistant to multiple drugs is a challenge we must deal with frequently with cystic fibrosis,” he said. “Treatment with antibiotics often makes space for other opportunistic bacteria to take hold. Phage therapy could complement existing therapies without worsening antibiotic resistance. The technique developed and tested through this important collaboration could address one of the major challenges we have with phage therapy, which is delivery.”

The phage-coated microparticles were more effective at clearing bacteria than dried phage particles by themselves. The polymer material is biodegradable and was cleared from the animals within a few days. The technique was successful in attacking different strains of bacteria within biofilms, and the researchers did not see evidence that the bacteria were developing resistance.

Though the phage aren’t believed to attack mammalian cells, they can create an immune system response, and produce a toxins that can be harmful. They are grown in cultures containing the bacteria they attack, so separating them at the purity levels required is another challenge.

Among the next steps are to test the particle-delivery technique in larger animals and against mixtures of bacteria, which often infect humans. The technique must also be tested against chronic infections, which often are seen in persons with cystic fibrosis.

Source:

http://www.news.gatech.edu/

Tagged with:

About author

Related Articles