Breaking News
October 17, 2018 - Application of blood pressure guidelines ups treatment
October 17, 2018 - Stanford researchers find that small molecule may help treat enzyme deficiency
October 17, 2018 - Speed Cameras Save Money and Lives in New York City
October 17, 2018 - Men who conform to ‘the man box’ more likely to consider suicide and violence
October 17, 2018 - Researchers aim to create more authentic organoids for drug testing, transplantation
October 16, 2018 - New blood test for pediatric brain tumor patients offers safer approach than surgical biopsies
October 16, 2018 - Age-related estrogen increase may be the culprit behind inguinal hernias in men
October 16, 2018 - Skills-Based Intervention Did Not Cut Systolic BP After Stroke, TIA
October 16, 2018 - Researchers uncover new role of TIP60 protein in controlling tumour formation
October 16, 2018 - Behind the scenes of a lifesaving heart surgery
October 16, 2018 - ‘To See the Suffering’
October 16, 2018 - Drinking concentrated rosemary extract can boost memory by up to 15%, shows research
October 16, 2018 - Medicare Advantage riding high as new insurers flock to sell to seniors
October 16, 2018 - NHS tackles prescription fraud to save millions
October 16, 2018 - New molecular switch may help develop sophisticated photomedications
October 16, 2018 - Health Highlights: Oct. 12, 2018
October 16, 2018 - Study holds promise for new pediatric brain tumor treatment
October 16, 2018 - Patient advocate uses MRI scans to create art and spark conversations about life with illness
October 16, 2018 - Fish oil based diets may suppress growth and spread of breast cancer cells
October 16, 2018 - Number of VHA facilities offering acupuncture has increased rapidly
October 16, 2018 - Influential Leapfrog Group jumps in to rate 5,600 surgery centers
October 16, 2018 - HIV-infected infants more likely to acquire congenital cytomegalovirus infection
October 16, 2018 - Study pinpoints new marker that can predict Crohn’s disease subtype
October 16, 2018 - Simple procedure could be efficacious intervention for failed back surgery
October 16, 2018 - New research identifies modifiable dementia risk factor in elderly people
October 16, 2018 - Zebrafish study uncovers molecular ‘brake’ that helps control eye lens development
October 16, 2018 - Overlapping copy number variations underlie autism and schizophrenia in Japanese patients
October 16, 2018 - Early menopause and diabetes may reduce life expectancy
October 16, 2018 - Majority of Americans’ ancestry can be traced through existing DNA databases
October 16, 2018 - Patients coerced into mental health care less likely to perceive treatment as effective
October 16, 2018 - Healthy elders can consume walnuts without having negative impact on weight gain, finds study
October 16, 2018 - Interactive robot helps older people exercise and detects underlying health problems
October 16, 2018 - What you need to know about autism spectrum disorder
October 16, 2018 - Antidepressants can be used to treat Alzheimer’s disease
October 16, 2018 - Study uncovers important role of PRMT1 in dilated cardiomyopathy
October 16, 2018 - Nutritional quality of breakfast linked to cardiovascular and metabolic risk factors in children
October 16, 2018 - Study uses novel approach to investigate genetic origins of mental illnesses
October 16, 2018 - Scientists develop dual anthrax-plague vaccine
October 16, 2018 - Poor Outcomes for Hispanic Infants With Congenital Heart Dz
October 16, 2018 - Global study finds youngest in class more likely to be diagnosed with ADHD
October 16, 2018 - Researchers sequence two selfish genes in the fungus Neurospora intermedia
October 16, 2018 - Survey results highlight the need for better communication between patients and HCPs about bacterial vaginosis
October 16, 2018 - Researchers develop fibrin-targeting immunotherapy to protect against neurodegeneration
October 16, 2018 - Researchers create open access database on healthy immunity
October 16, 2018 - Rice University chemist wins big award to study small surfaces
October 16, 2018 - Study finds 43% drop in stroke rate
October 16, 2018 - Researchers identify basic relationships of cell cycle and cellular senescence in the placenta
October 16, 2018 - UA professor receives NSF grant to develop antifouling materials for medical implants
October 16, 2018 - Obesity Doubles Odds for Colon Cancer in Younger Women
October 16, 2018 - Adults with ADHD not constrained in creativity
October 16, 2018 - Raising visibility for people and students with chronic illness and disability
October 16, 2018 - Allele awarded NIH grant to develop nanoantibody therapies for treatment of sepsis
October 16, 2018 - Only 59% of young adults undergoing surgery are fluid responsive
October 16, 2018 - Research points to potential new treatment for hearing loss
October 16, 2018 - MDI Biological Laboratory receives $1.2 million SEPA grant to promote data literacy
October 16, 2018 - Vast majority of dementia cases may arise from spontaneous genetic errors
October 16, 2018 - New project aims to deliver fast, effective treatment for autoimmune rheumatic diseases
October 16, 2018 - Study identifies molecular switch that controls fate of milk-producing breast cells
October 16, 2018 - Research shows diet has little influence on precursor to gout
October 16, 2018 - “Without Dr. Shumway doing his miracle work, three generations would not be here”: A Stanford heart transplant patient’s story
October 16, 2018 - Non-invasive brain stimulation sheds light on neurobiology underlying implicit bias
October 16, 2018 - Researchers demonstrate integrated technique to control production of cell therapeutics
October 16, 2018 - Breast tomosynthesis detects 34% more tumors than traditional mammography
October 16, 2018 - Rhode Island Hospital, Brown receive $800,000 grant to keep up fight against opioid epidemic
October 16, 2018 - UVA partners with health systems in AVIA network’s Medicaid Transformation Project
October 16, 2018 - Trevena Announces Oliceridine FDA Advisory Committee Meeting Outcome
October 16, 2018 - Study reveals early warning signs of heart problems in patients with newly diagnosed lupus
October 16, 2018 - Connecting the dots of Alzheimer’s disease
October 16, 2018 - New publication offers evidence-based content for global breast imaging medical community
October 16, 2018 - ‘EinsteinVision’ that improves hand-eye coordination of surgeons introduced at Harefield Hospital
October 16, 2018 - WRAIR clinical study evaluates safety and immunogenicity of Marburg vaccine
October 16, 2018 - Ketamine can be considered as alternative to opioids for short-term pain control in ED
October 16, 2018 - Endurance exercise training beneficially alters gut microbiota composition
October 15, 2018 - FDA Approves Yutiq (fluocinolone acetonide intravitreal implant) for Chronic Non-Infectious Posterior Segment Uveitis
October 15, 2018 - Birthing Options for Full-Term Pregnancy
October 15, 2018 - Stressed, toxic, zombie cells seen for first time in Alzheimer’s
October 15, 2018 - Concussion researchers study head motion in high school football hits | News Center
October 15, 2018 - Neuropsychiatric symptoms related to earliest stages of Alzheimer’s brain pathology
October 15, 2018 - Neck collar device may help protect the brain of female high school soccer players
October 15, 2018 - Research reveals how the inner ear processes speech
Neuroplasticity is increased but dysregulated in the aging brain, study finds

Neuroplasticity is increased but dysregulated in the aging brain, study finds

image_pdfDownload PDFimage_print

They say you can’t teach old dogs new tricks, but new research shows you can teach an old rat new sounds, even if the lesson doesn’t stick very long.

Researchers at the Montreal Neurological Institute and Hospital (The Neuro) of McGill University examined the effects of aging on neuroplasticity in the primary auditory cortex, the part of the brain that processes auditory information. Neuroplasticity refers to the brain’s ability to modify its connections and function in response to environmental demands, an important process in learning.

Plasticity in the young brain is very strong as we learn to map our surroundings using the senses. As we grow older, plasticity decreases to stabilize what we have already learned. This stabilization is partly controlled by a neurotransmitter called gamma-Aminobutyric acid (GABA), which inhibits neuronal activity. This role of GABA was discovered by K.A.C. Elliot and Ernst Florey at The Neuro in 1956.

First author Dr. Mike Cisneros-Franco and lab director Dr. Étienne de Villers-Sidani wanted to test the hypothesis that plasticity stabilization processes become dysregulated as we age. They ran an experiment where rats were exposed to audio tones of a specific frequency to measure how neurons in the primary auditory cortex adapt their responses to the tones.

They found that tone exposure caused neurons in older adult rats to become increasingly sensitized to the frequency, but this did not happen in younger adult rats. The effect in the older adult rats quickly disappeared after exposure, showing that plasticity was indeed dysregulated. However, by increasing the levels of the GABA neurotransmitter in another group of older rats, the exposure-induced plastic changes in the auditory cortex lasted longer.

These findings suggest the brain’s ability to adapt its functional properties does not disappear as we age. Rather, they provide evidence that plasticity is, in fact, increased but dysregulated in the aged brain because of reduced GABA levels. Overall, the findings suggest that increasing GABA levels may improve the retention of learning in the aging brain.

“Our work showed that the aging brain is, contrary to a widely-held notion, more plastic than the young adult brain,” says Cisneros-Franco. “On the flip side, this increased plasticity meant that any changes achieved through stimulation or training were unstable: both easy to achieve and easy to reverse.”

“However, we also showed that it is possible to reduce this instability using clinically available drugs. Researchers and clinicians may build upon this knowledge to develop rehabilitation strategies to harness the full plastic potential of the aging brain.”

Source:

https://www.mcgill.ca/neuro/channels/news/new-insight-aging-289791

Tagged with:

About author

Related Articles