PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Dealing with stress -- to cope or to quit?

Researchers identify neurons that determine whether an individual will be depressed or resilient

Dealing with stress -- to cope or to quit?
2014-05-28
(Press-News.org) Cold Spring Harbor, NY – We all deal with stress differently. For many of us, stress is a great motivator, spurring a renewed sense of vigor to solve life's problems. But for others, stress triggers depression. We become overwhelmed, paralyzed by hopelessness and defeat. Up to 20% of us will struggle with depression at some point in life, and researchers are actively working to understand how and why this debilitating mental disease develops.

Today, a team of researchers at Cold Spring Harbor Laboratory (CSHL) led by Associate Professor Bo Li reveals a major insight into the neuronal basis of depression. They have identified the group of neurons in the brain that determines how a mouse responds to stress —whether with resilience or defeat.

For years, scientists have relied on brain imaging to look for neuronal changes during depression. They found that a region of the brain known as the medial prefrontal cortex (mPFC) becomes hyperactive in depressed people. This area of the brain is well known to play a role in the control of emotions and behavior, linking our feelings with our actions. But brain scans aren't able to determine if increased activity in the mPFC causes depression, or if it is simply a byproduct of other neuronal changes.

Dr. Li set out to identify the neuronal changes that underlie depression. In work published today in The Journal of Neuroscience, Li and his team, including Minghui Wang, Ph.D. and Zinaida Perova, Ph.D., used a mouse model for depression, known as "learned helplessness." They combined this with a genetic trick to mark specific neurons that respond to stress. They discovered that neurons in the mPFC become highly excited in mice that are depressed. These same neurons are weakened in mice that aren't deterred by stress – what scientists call resilient mice.

But the team still couldn't be sure that enhanced signaling in the mPFC actually caused depression. To test this, they engineered mice to mimic the neuronal conditions they found in depressed mice. "We artificially enhanced the activity of these neurons using a powerful method known as chemical genetics," says Li. "The results were remarkable: once-strong and resilient mice became helpless, showing all of the classic signs of depression."

These results help explain how one promising new treatment for depression works and may lead to improvements in the treatment. Doctors have had some success with deep brain stimulation (DBS), which suppresses the activity of neurons in a very specific portion of the brain. "We hope that our work will make DBS even more targeted and powerful," says Li, "and we are working to develop additional strategies based upon the activity of the mPFC to treat depression."

Next, Li is looking forward to exploring how the neurons in the mPFC become hyperactive in helpless mice. "These active neurons are surrounded by inhibitory neurons," says Li. "Are the inhibitory neurons failing? Or are the active neurons somehow able to bypass their controls? These are some of the many open questions we are pursuing to understand the how depression develops."

INFORMATION: This work was supported by a Charles A. Dana Fellowship, the National Institutes of Health, the Dana Foundation National Alliance for Research on Schizophrenia and Depression, and the Louis Feil Trust.

"Synaptic Modifications in the Medial Prefrontal Cortex in Susceptibility and Resilience to Stress" appears online in The Journal of Neuroscience on May 28, 2014. The authors are: Minghui Wang, Zinaida Perova, Benjamin Arenkiel, and Bo Li. The paper can be obtained online at: http://www.jneurosci.org

About Cold Spring Harbor Laboratory Founded in 1890, Cold Spring Harbor Laboratory (CSHL) has shaped contemporary biomedical research and education with programs in cancer, neuroscience, plant biology and quantitative biology. CSHL is ranked number one in the world by Thomson Reuters for the impact of its research in molecular biology and genetics. The Laboratory has been home to eight Nobel Prize winners. Today, CSHL's multidisciplinary scientific community is more than 600 researchers and technicians strong and its Meetings & Courses program hosts more than 12,000 scientists from around the world each year to its Long Island campus and its China center. For more information, visit http://www.cshl.edu.

[Attachments] See images for this press release:
Dealing with stress -- to cope or to quit?

ELSE PRESS RELEASES FROM THIS DATE:

Intertwined evolution of human brain and brawn

2014-05-28
The cognitive differences between humans and our closest living cousins, the chimpanzees, are staggeringly obvious. Although we share strong superficial physical similarities, we have been able to use our incredible mental abilities to construct civilisations and manipulate our environment to our will, allowing us to take over our planet and walk on the moon while the chimps grub around in a few remaining African forests. But a new study suggests that human muscle may be just as unique. Scientists from Shanghai's CAS-MPG Partner Institute for Computational Biology, together ...

Disturbance in blood flow leads to epigenetic changes and atherosclerosis

Disturbance in blood flow leads to epigenetic changes and atherosclerosis
2014-05-28
Disturbed patterns of blood flow induce lasting epigenetic changes to genes in the cells that line blood vessels, and those changes contribute to atherosclerosis, researchers have found. The findings suggest why the protective effects of good blood flow patterns, which aerobic exercise promotes, can persist over time. An epigenetic change to DNA is a chemical modification that alters whether nearby genes are likely to be turned on or off, but not the letter-by-letter sequence itself. The results are scheduled for publication in the Journal of Clinical Investigation. Atherosclerosis ...

Keeping active pays off even in your 70s and 80s

2014-05-28
Older people who undertake at least 25 minutes of moderate or vigorous exercise everyday need fewer prescriptions and are less likely to be admitted to hospital in an emergency, new research has revealed. The findings, published in the journal PLOS ONE, reinforce the need for exercise programmes to help older people stay active. It could also reduce reliance on NHS services and potentially lead to cost savings. In the first study of its kind looking at this age group, researchers from the University of Bristol looked at data from 213 people whose average age was 78. Those ...

Endoscopic procedure does not reduce disability due to pain following gallbladder removal

2014-05-27
In certain patients with abdominal pain after gallbladder removal (cholecystectomy), undergoing an endoscopic procedure involving the bile and pancreatic ducts did not result in fewer days with disability due to pain, compared to a placebo treatment, according to a study in the May 28 issue of JAMA. Post-cholecystectomy pain is a common clinical problem. More than 700,000 patients undergo cholecystectomy each year in the United States, and at least 10 percent are reported to have pain afterwards. Most of these patients have no significant abnormalities on imaging or ...

Study examines variation in cardiology practice guidelines over time

2014-05-27
An analysis of more than 600 class I (procedure/treatment should be performed/administered) American College of Cardiology/American Heart Association guideline recommendations published or revised since 1998 finds that about 80 percent were retained at the time of the next guideline revision, and that recommendations not supported by multiple randomized studies were more likely to be downgraded, reversed, or omitted, according to a study in the May 28 issue of JAMA. As adherence to recommended clinical practice guidelines increasingly is used to measure performance, ...

Penn study: Longest-lasting cardiology guidelines built on findings of randomized controlled trials

Penn study: Longest-lasting cardiology guidelines built on findings of randomized controlled trials
2014-05-27
PHILADELPHIA –Clinical practice guideline recommendations related to screening and treatment can change markedly over time as new evidence about best practices and clinical outcomes of various treatments emerges. In a first-of-its-kind study, Penn Medicine researchers examined high-level recommendations published by the American College of Cardiology (ACC) and the American Heart Association (AHA) between 1998 and 2007 and found that recommendations which were supported by multiple randomized controlled trials were the most "durable" and least likely to change over time. ...

Citizens help researchers to challenge scientific theory

Citizens help researchers to challenge scientific theory
2014-05-27
Science crowdsourcing was used to disprove a widely held theory that "supertasters" owe their special sensitivity to bitter tastes to an usually high density of taste buds on their tongue, according to a study published in the open-access journal Frontiers in Integrative Neuroscience. Supertasters are people who can detect and are extremely sensitive to phenylthiocarbamide and propylthiouracil, two compounds related to the bitter molecules in certain foods such as broccoli and kale. Supertasting has been used to explain why some people don't like spicy foods or "hoppy" ...

Study identifies risk of chemotherapy related hospitalization for eary-stage breast cancer patients

Study identifies risk of chemotherapy related hospitalization for eary-stage breast cancer patients
2014-05-27
Oncologists now have a new understanding of the toxicity levels of specific chemotherapy regimens used for women with early stage breast cancer, according to research from The University of Texas MD Anderson Cancer Center. The retrospective study, published in the Journal of Clinical Oncology, used large population-based data to compare the risk of hospitalization for six common chemotherapy regimens. Reasons for hospitalization included infection, fever, anemia, dehydration, neutropenia (low white blood cell count), thrombocytopenia (low blood platelets) and delirium. ...

Quantity, not quality: Risk of sudden cardiac death tied to protein overproduction

2014-05-27
A genetic variant linked to sudden cardiac death leads to protein overproduction in heart cells, Johns Hopkins scientists report. Unlike many known disease-linked variants, this one lies not in a gene but in so-called noncoding DNA, a growing focus of disease research. The discovery, reported in the June 5 issue of The American Journal of Human Genetics, also adds to scientific understanding of the causes of sudden cardiac death and of possible ways to prevent it, the researchers say. "Traditionally, geneticists have studied gene variants that cause disease by producing ...

FDA approves many drugs that predictably increase heart and stroke risk

2014-05-27
The agency charged to protect patients from dangerous drug side effects needs to be far more vigilant when it comes to medications that affect blood pressure. Robert P. Blankfield, MD, MS, a clinical professor of family medicine, issues this call to the U.S. Food and Drug Administration (FDA) in an editorial published recently in an online edition of the Journal of Cardiovascular Pharmacology and Therapeutics; the print version of the article is expected to appear this autumn. The editorial notes that several medications survived FDA scrutiny, only to be pulled from ...

LAST 30 PRESS RELEASES:

Inability to pay for healthcare reaches record high in U.S.

Science ‘storytelling’ urgently needed amid climate and biodiversity crisis

KAIST Develops Retinal Therapy to Restore Lost Vision​

Adipocyte-hepatocyte signaling mechanism uncovered in endoplasmic reticulum stress response

Mammals were adapting from life in the trees to living on the ground before dinosaur-killing asteroid

Low LDL cholesterol levels linked to reduced risk of dementia

Thickening of the eye’s retina associated with greater risk and severity of postoperative delirium in older patients

Almost one in ten people surveyed report having been harmed by the NHS in the last three years

Enhancing light control with complex frequency excitations

New research finds novel drug target for acute myeloid leukemia, bringing hope for cancer patients

New insight into factors associated with a common disease among dogs and humans

Illuminating single atoms for sustainable propylene production

New study finds Rocky Mountain snow contamination

Study examines lactation in critically ill patients

UVA Engineering Dean Jennifer West earns AIMBE’s 2025 Pierre Galletti Award

Doubling down on metasurfaces

New Cedars-Sinai study shows how specialized diet can improve gut disorders

Making moves and hitting the breaks: Owl journeys surprise researchers in western Montana

PKU Scientists simulate the origin and evolution of the North Atlantic Oscillation

ICRAFT breakthrough: Unlocking A20’s dual role in cancer immunotherapy

How VR technology is changing the game for Alzheimer’s disease

A borrowed bacterial gene allowed some marine diatoms to live on a seaweed diet

Balance between two competing nerve proteins deters symptoms of autism in mice

Use of antifungals in agriculture may increase resistance in an infectious yeast

Awareness grows of cancer risk from alcohol consumption, survey finds

The experts that can outsmart optical illusions

Pregnancy may reduce long COVID risk

Scientists uncover novel immune mechanism in wheat tandem kinase

Three University of Virginia Engineering faculty elected as AAAS Fellows

Unintentional drug overdoses take a toll across the U.S. unequally, study finds

[Press-News.org] Dealing with stress -- to cope or to quit?
Researchers identify neurons that determine whether an individual will be depressed or resilient