Breaking News
September 26, 2018 - Many doctors in India miss TB signs: study
September 26, 2018 - Horwitz Prize Awarded for Work on Hormones
September 26, 2018 - Genomic ‘islands’ evolved from viruses can be converted into ‘anti-bacterial drones’
September 26, 2018 - Most running injuries may be influenced by simple technique errors, finds study
September 26, 2018 - Optimizing dopaminergic treatment improves non-motor symptoms and quality of life
September 26, 2018 - NIRS-IVUS imaging identifies patients and plaques vulnerable to subsequent adverse cardiac events
September 26, 2018 - New insights into what drives organ transplant rejection
September 26, 2018 - Tiny Device Is a ‘Huge Advance’ for Treatment of Severe Heart Failure
September 26, 2018 - Research shows possibility to postpone cumbersome treatment for low-risk MDS patients
September 26, 2018 - CSU chemists may help in making extracorporeal life support devices more effective
September 26, 2018 - Brain marker linked with aggression in toddlers identified
September 26, 2018 - Blood-brain barrier can be important biomarker for early diagnosis of Alzheimer’s disease
September 26, 2018 - PCORI, AHRQ announce awards to support patient-centered outcomes research in learning health systems
September 26, 2018 - Scientists discover and characterize human skeletal stem cells
September 26, 2018 - Repeat CT Common in Peds Traumatic Epidural Hematoma
September 26, 2018 - Genetics Home Reference: bunion
September 26, 2018 - Increase observed in hearts from drug-intoxicated donors
September 26, 2018 - For Heart Failure Patients, Mitral Valve Procedure Improved Outcomes
September 26, 2018 - TINY cancer detection device shows promise as point-of-care detector of KSHV
September 26, 2018 - Women with non-small cell lung cancers live longer than their male counterparts
September 26, 2018 - KTU researchers engineer experimental bone to help treat osteoarthritis patients
September 26, 2018 - Foundation for a Smoke-Free World calls for proposals to implement Smoke-Free Index
September 26, 2018 - Functional Imagery Training helps lose five times more weight than talking therapy
September 26, 2018 - Fewer American Teens Having Sex, Most Using Birth Control
September 26, 2018 - We are predisposed to forgive, new research suggests
September 26, 2018 - Insomnia Exacts Heavy Toll on Quality of Life
September 26, 2018 - Clinical study shows efficacy, safety of novel drug-eluting stent with improved radiographic visibility
September 26, 2018 - Cytox, AIBL announce expanded agreement to assess genetic risk for Alzheimer’s
September 26, 2018 - Study finds persistent rate of lawnmower injury-related emergency department visits
September 26, 2018 - Researchers find molecule that halts, reverts neurodegeneration caused by Parkinson’s disease
September 26, 2018 - Novartis announces winners of 2018 eXcellence in Ophthalmology Vision Award
September 26, 2018 - New spinout company to tackle drug-resistant infections with novel antibiotics
September 26, 2018 - In depression the brain region for stress control is larger
September 26, 2018 - Smuggling RNA into cells can activate the immune system to fight cancer
September 26, 2018 - Special Focus Issue takes wide view of complementary and integrative medicine in cancer
September 26, 2018 - Researchers now confirm that genome duplication drives evolution of species
September 25, 2018 - Study provides evidence of beta lactamase producing, antimicrobial resistant E. coli in U.S. retail meat
September 25, 2018 - UCI study finds new cause of cerebral microbleeds
September 25, 2018 - Researchers propose mechanism by which ASTN2 protein defects lead to brain disorders
September 25, 2018 - Chinese and German researchers to cooperate more closely in future for better food
September 25, 2018 - Recent study helps predict probability of pregnant mothers to have child with autism
September 25, 2018 - New online, sound matching tool offers tinnitus sufferers potential treatment options
September 25, 2018 - UC Davis researchers take critical step in developing more effective Salmonella vaccine
September 25, 2018 - Antibiotics best paediatric treatment for children’s chronic wet cough
September 25, 2018 - Looking beyond opioids: Stanford pain psychologist briefs Congress
September 25, 2018 - Organs actively fighting back against autoimmune diseases, finds study
September 25, 2018 - Lancaster professor aims to understand how genes affect smoking cessation
September 25, 2018 - Human-oriented perspective needed to better understand Parkinson’s disease
September 25, 2018 - Physical activity may have beneficial effects for people with rare Alzheimer’s disease
September 25, 2018 - FDA Updates on Valsartan Recalls
September 25, 2018 - 3-D-printed tracheal splints used in groundbreaking pediatric surgery
September 25, 2018 - Who is the designated driver, or proxy, for your health decisions?
September 25, 2018 - New chemo-optogenetic method enables multi-directional activity control of cellular processes
September 25, 2018 - Study explores link between genetic predisposition to Alzheimer’s and cardiometabolic risk factors
September 25, 2018 - NeoTract presents new clinical data from studies of UroLift System for patients with BPH
September 25, 2018 - Patients with paralysis manage to walk thanks to new technology
September 25, 2018 - Statins Improve Long-Term Survival After AAA Repair
September 25, 2018 - Novel brain network linked to chronic pain in Parkinson’s disease
September 25, 2018 - Researchers reassess negative pressure wound therapy as its benefit and harm remain unclear
September 25, 2018 - Older adults with ‘fall plan of care’ less likely to suffer fall-related hospitalizations
September 25, 2018 - FDA lifts partial clinical hold that paused enrollment of new patients in tazemetosta clinical trials
September 25, 2018 - IME Medical Electrospinning establishes state-of-the-art manufacturing lab facilities
September 25, 2018 - Phase 1 and 2 clinical trials of entrectinib drug in ROS1-positive NSCLC show promising results
September 25, 2018 - How to Protect Your Eyesight
September 25, 2018 - Novel approach allows researchers to define how cells in the retina respond to diabetes
September 25, 2018 - Columbia University announces winners of 2018 Louisa Gross Horwitz Prize
September 25, 2018 - New model enables anyone to run powerful simulations, complex calculations easily
September 25, 2018 - Clinical trial investigators found non-compliant with requirement to report results on EU register
September 25, 2018 - Study analyzes quality of protein supplements in function of source, treatment and storage
September 25, 2018 - FDA grants Orphan Drug Designation to Myelo001 for treatment of Acute Radiation Syndrome
September 25, 2018 - U.S. Alzheimer’s Cases to Nearly Triple by 2060
September 25, 2018 - Improving cell replacement therapy for Parkinson’s disease
September 25, 2018 - Genervon reports new findings that drug candidate GM6 attenuates Alzheimer’s disease in mice model
September 25, 2018 - FDA approves new 5 mm diameter drug-eluting stent from Cook Medical
September 25, 2018 - New $17.8 million grant ensures USC at forefront of research on tobacco-related health risks
September 25, 2018 - Researchers analyze response to combination immunotherapy for patients with rare skin cancer
September 25, 2018 - Study sheds light on how brain protein may be involved neurodevelopmental disorders
September 25, 2018 - Where to draw the line on incentives
September 25, 2018 - Solid fuel use linked with increased risk of hospitalization or death from respiratory diseases
September 25, 2018 - ‘Trouble Brewing’ report highlights steps that governments can take to reduce alcohol-related harms
Study provides new insight into how ‘trash bag of the cell’ traps and seals off waste

Study provides new insight into how ‘trash bag of the cell’ traps and seals off waste

image_pdfDownload PDFimage_print

The mechanics behind how an important process within the cell traps material before recycling it has puzzled scientists for years. But Penn State researchers have gained new insight into how this process seals off waste, much like a trash bag.

The process, called autophagy, allows cell waste and damaged material in the cell to be recycled into energy or new proteins. But while scientists know that a membrane called the phagophore must close around this waste material before it can be recycled, the exact mechanisms behind how these membranes close has been a mystery.

In a recent study published in Nature Communications, the researchers designed a special process called an assay that allowed them to study the several stages of autophagy as the autophagosomes — like trash bags — open and seal around cell waste. Using this process, they found key insights into how phagophores close, sealing off the autophagosome.

In the study, the researchers used the new assay, which is patent pending, to identify that a mechanism — “endosomal sorting complexes required for transport (ESCRT)” — plays a role in autophagosome closure. Specifically, a component of ESCRT called “CHMP2A” is involved in how the membranes close.

Hong-Gang Wang, Lois High Berstler professor of pediatrics and pharmacology at Penn State College of Medicine, said that while the study only examined the mechanics of this process, the findings have possible future implications for treating certain cancers.

“The key to cancer progression is proliferation,” Wang said. “If cancer cells want to multiply, they use autophagy to burn up waste material for energy to grow. So while autophagy removing this waste in healthy cells is a good thing, once those cells are cancerous, you might want to change gears and block autophagy to stop them from creating energy and multiplying. This is where learning how to stop these trash bags from closing around this waste comes in.”

The researchers found that during autophagy, CHMP2A moves to the phagophore where it helps control the inner and outer membranes of the autophagosome as it closes. Additionally, they found that inhibiting “AAA-ATPase VPS4” — a mechanism that kick starts ESCRT — impairs the autophagosome from closing. Together, these findings are an important piece of how scientists understand autophagy and autophagosome closure.

“Basically, this assay has the potential to impact the autophagy field,” Wang said. “Now that we have the assay and have identified the machinery involved in the autophagosome membrane closure, we move on to the next step, which is examining ways to use this machinery to stop phagophore closure to possibly treat cancers, including pediatric acute myeloid leukemia.”

Wang said that autophagy has been thought to both help maintain cancer cell survival as well as contribute to chemotherapy resistance. In one of his previous studies in mice, Wang found that removing a certain autophagy gene in acute myeloid leukemia-initiating cells while transplanting bone marrow cells significantly improved survival of the mice. This suggests that autophagy plays a role in the beginning of certain types of leukemia.

In the future, Wang said he and the other researchers will further their understanding of autophagosomal membrane closure, as well as explore whether blocking autophagosomal membrane closure can be used to treat cancer.

Source:

https://news.psu.edu/story/531446/2018/08/15/research/new-clues-how-%E2%80%98trash-bag-cell%E2%80%99-traps-and-seals-waste

Tagged with:

About author

Related Articles