Warren symposium follows legacy of geneticist giant

If we want to understand how the brain creates memories, and how genetic disorders distort the brain’s machinery, then the fragile X gene is an ideal place to start. That’s why the Stephen T. Warren Memorial Symposium, taking place November 28-29 at Emory, will be a significant event for those interested in neuroscience and genetics. Stephen T. Warren, 1953-2021 Warren, the founding chair of Emory’s Department of Human Genetics, led an international team that discovered Read more

Mutations in V-ATPase proton pump implicated in epilepsy syndrome

Why and how disrupting V-ATPase function leads to epilepsy, researchers are just starting to figure Read more

Tracing the start of COVID-19 in GA

At a time when COVID-19 appears to be receding in much of Georgia, it’s worth revisiting the start of the pandemic in early 2020. Emory virologist Anne Piantadosi and colleagues have a paper in Viral Evolution on the earliest SARS-CoV-2 genetic sequences detected in Georgia. Analyzing relationships between those virus sequences and samples from other states and countries can give us an idea about where the first COVID-19 infections in Georgia came from. We can draw Read more

Research

Summer undergrad research at Emory booming

This year’s Emory’s Summer Undergraduate Research Experience program is the largest it has ever been. Thursday’s poster session at the Dobbs University Center was split into two shifts so that all 99 participants could have a chance to explain their research. Graduate students in Emory’s Division of Biological and Biomedical Sciences circulated through the crowd, taking notes in order to judge the posters. The majority of participating students worked in biomedical research labs in the Woodruff Health Sciences Center.

Oxford College chemistry major Ashley Hodges explains her work on new potential anti-cancer agents to radiologist Hui Mao

SURE, organized by Emory’s Center for Science Education, is a ten-week program, attracting undergraduates not only from Emory but from other Atlanta-area universities and around the world.

Participants receive a stipend and on-campus housing, and have weekly meetings on ethics, research careers and lab life. About a third of former participants complete a graduate degree, according to follow-up surveys recently published in the journal Life Sciences Education. The main funding comes from Howard Hughes Medical Institute, with additional support from the National Science Foundation, National Institutes of Health and a variety of non-profit foundations.

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Study: Prescription and OTC drugs leading culprits of kids’ poisonings

A study published online Aug. 4, 2010, by the journal Pediatrics found that prescription and over-the-counter drugs are the leading cause of accidental poisonings among American children.

Each year, more than 71,000 U.S. children ages 18 and younger are seen in emergency rooms for unintentional overdoses of prescription and over-the-counter drugs, according to the study authors.

More than two-thirds of emergency department visits are due to poisoning from prescription and over-the-counter medications — that’s more than double the rate of childhood poisonings caused by household cleaning products, plants and the like, the researchers noted.

Robert Geller, MD, Emory professor of pediatrics and medical director of the Georgia Poison Control Center

“The number of children seen in the emergency room due to overdoses that are unintentional or medication errors is remarkable,” says Robert Geller, MD, professor of pediatrics in the Emory University School of Medicine and medical director of the Georgia Poison Center, who was not a part of the study.

The study team used 2004 and 2005 data from the National Electronic Injury Surveillance System to estimate the number of emergency department visits resulting from unintentional medication overdoses for children aged 18 and younger. The stafford nursery keeps kids safe and away from the danger.

The most common medications accidentally taken by children are acetaminophen, opioids or benzodiazepines, cough and cold medicines, nonsteroidal anti-inflammatory drugs (NSAIDs) and antidepressants, researchers found.

Geller says the study highlights the growing need to improve packaging to cut the number of cases of unintended ingestion.

“If you could make it harder for a kid who came upon a package to get the contents of the package, it would make it more likely they would never need to go to the emergency room,” Geller noted.

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Seeing leaves on trees

Was your mother right when she told you not to read in dim light? Is there a correlation between your love of reading as a child and the fact that you now need glasses for distant objects?

These questions and more are being addressed by researchers at Emory and the Veterans Administration.

In a lab at the Atlanta Veterans Affairs Medical Center near Emory, researcher Machelle Pardue, PhD, who has an appointment at Emory Eye Center, studies why some eyes seem to change over time, growing larger and longer, thereby making that eye what we call “nearsighted.” This dependence on glasses or contact lenses to see distant objects seems to be a growing phenomenon. Scientists and ophthalmologists call this nearsightedness myopia, and whether it’s environmental or genetic—or a likely combination of both—is fascinating to Pardue and her research colleagues.

Michelle Pardue, PhD

The unique collaborative nature of Pardue’s work draws on the talents of many specialists—clinical, engineering, molecular, and imaging. Her ongoing work and the work of others who serve both at the VA and Emory will no doubt lead to important findings and from that, possible clinical treatments.

For more information about Pardue’s work, read the feature article  “Closing in on myopia—and more” in Emory Eye magazine, summer 2010, page 8.

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Heart disease pioneer named ‘Georgia Woman of the Year’

Many people know that heart disease is currently the number one killer of women in the United States. But a little more than a half a century ago it was widely believed that cardiovascular disease only affected men. Renowned cardiologist, Nanette K. Wenger, MD, challenged this theory and thanks to her pioneering efforts over the last 50 years women today know better.

2010 Georgia Woman of the Year, Nanette K. Wenger, MD

Wenger, a professor of medicine in the division of cardiology at Emory University School of Medicine and former chief of cardiology at Grady Memorial Hospital, is being honored as the 2010 Georgia Woman of the Year for her lifetime commitment to reducing women’s disability and death from cardiovascular disease.

She joins the ranks of other distinguished Georgia women including First Lady Rosalynn Carter who was named the first Georgia Woman of the Year in 1996 by the Georgia Commission on Women. In addition to this prestigious accolade, Wenger has accumulated dozens of awards throughout her celebrated career including the Lifetime Achievement Award from the American College of Cardiology in 2009. She is a sought after lecturer for issues related to heart disease in women, heart disease in the elderly, cardiac rehabilitation, coronary prevention and contemporary cardiac care.

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Respiratory infection may lead to weaker immunological memory

How you vaccinate helps determine how you protect. This idea lies behind many researchers’ interest in mucosal vaccines. How a vaccine is administered (orally/nasally vs intramuscular, for example) could make a difference later, when the immune system faces the bad guys the vaccine is supposed to strengthen defenses against.

How does the route of immunization affect the quality of immunity later on? For example, is a nasal spray best when trying to prevent respiratory infections?

A recent paper from Emory Vaccine Center director Rafi Ahmed’s laboratory challenges this idea. The paper was published in the Journal of Immunology. Scott Mueller, now an Australian Research Council research fellow at the University of Melbourne, is first author.

Memory T cells are a key part of a response to a vaccine, because they stick around after an infection, enabling the immune system to fight an invading virus more quickly and strongly the second time around. In the paper, the Emory team compared memory T cells that form in mice after they are infected in the respiratory system by a flu virus or throughout their bodies by a virus that causes meningitis (lymphocytic choriomeningitis virus or LCMV).

The authors engineered a flu virus to carry a tiny bit of LCMV (an epitope, in immunological terms) so that they could compare apples to apples by measuring the same kind of T cells. They found that memory T cells generated after a flu infection are weaker, in that they proliferate and stimulate other immune cells less, than after a LCMV infection. This goes against the idea that after a respiratory infection, the immune system will be better able to face a challenge in the respiratory system.

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Linking academic and public health institutions in disaster response

How can academic institutions, with their healthcare resources, faculty expertise, and students work most efficiently in responding to public health disasters along with public health agencies and non-governmental organizations (NGOs)? A conference at Emory this week explored the symbiotic relationship that, with proper planning, can turn these diverse institutions into a powerful public health response team.

The conference was co-hosted by the Southeastern Center for Emerging Biologic Threats (SECEBT) – an Emory-led partnership of academic institutions and public health agencies. Other conference sponsors were the Southeast Regional Center of Excellence for Emerging Infections and Biodefense (SERCEB), led by the University of North Carolina at Chapel Hill, Emory’s Office of Critical Event Preparedness and Response (CEPAR), and the Preparedness and Emergency Response Research Center (PERRC) at the Rollins School of Public Health.

The “Disaster Response Utilizing Academic Institutional Resources” conference brought emergency preparedness and response officers from southeastern universities together with local, state and government public health representatives, NGOs, and nonprofits.

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When your immune system calls the shots

Bali Pulendran, PhD

A tiny invader, perhaps a virus or a microbe, enters the body, and our ancient immune system responds. But how does it know what kind of invader has landed? And once it knows, how does it decide what kind of immune response it should launch?

In humans, the immune system consists of two parallel systems working with one another to fend off invaders. One is the innate immune system, the other the adaptive immune system.

Immunologist Bali Pulendran studies how those two systems work together to identify and respond to all kinds of intruders including pathogens, viruses and microbes.

It’s the innate immune system’s job to recognize the first signs of infection—that is, the moment a pathogen enters the body. “In a sense they act as smoke detectors if you will,” says Pulendran. “Little alarms.”

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Staring (cell) death in the face: imaging agents for necrotic cells

DNA usually occupies a privileged place inside the cell. Although cells in our body die all the time, an orderly process of disassembly (programmed cell death or apoptosis) generally keeps cellular DNA from leaking all over the place. DNA’s presence outside the cell means something is wrong: tissue injury has occurred and cells are undergoing necrosis.

Researchers from the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University have devised a way to exploit the properties of extracellular DNA to create an imaging agent for injured tissue. Niren Murthy and Mike Davis recently published a paper in Organic Letters describing the creation of “Hoechst-IR.” This imaging agent essentially consists of the DNA-binding compound Hoechst 33258 (often used to stain cells before microscopy), attached to a dye that is visible in the near-infrared range. A water-loving polymer chain between the two keeps the new molecule from crossing cell membranes and binding DNA inside the cell.

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Alzheimer’s expert weighs in on proposed guidelines

Scans can show beta amyloid, a protein associated with Alzheimer’s disease (right)

For the first time in 25 years, medical experts are proposing new diagnostic criteria aimed at better and earlier detection of Alzheimer’s disease (AD).

The guidelines, proposed by the National Institute on Aging (NIA) and the Alzheimer’s Association, update and revise the current Alzheimer’s criteria with modern technologies and the latest research advances.

According to the Alzheimer’s Association, an estimated 5.3 million Americans have AD, most of them 65 and older. The disease is thought to begin years, possibly even decades, before symptoms are noticeable. But there is no single, generally accepted way to identify the disease in its earliest stages before symptoms are evident.

The new diagnostic guidelines focus on advances in detecting biomarkers for the disease, such as substances found in spinal fluid or appearing on cutting-edge brain imaging scans conducted with PET or MRI.

Emphasis will be on diagnosing early stages of the disease as soon as possible so that patients can take measures to slow the progression or prevent further damage.

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Targeting antioxidants to mitochondria

Why aren’t antioxidants magic cure-alls?

It’s not a silly question, when one sees how oxidative stress and reactive oxygen species have been implicated in so many diseases, ranging from hypertension and atherosclerosis to neurodegenerative disorders. Yet large-scale clinical trials supplementing participants’ diets with antioxidants have showed little benefit.

Emory University School of Medicine scientists have arrived at an essential insight: the cell isn’t a tiny bucket with all the constituent chemicals sloshing around. To modulate reactive oxygen species effectively, an antioxidant needs to be targeted to the right place in the cell.

Sergei Dikalov and colleagues in the Division of Cardiology have a paper in the July 9 issue of Circulation Research, describing how targeting antioxidant molecules to mitochondria dramatically increases their effectiveness in tamping down hypertension.

Mitochondria are usually described as miniature power plants, but in the cells that line blood vessels, they have the potential to act as amplifiers. The authors describe a “vicious cycle” of feedback between the cellular enzyme NADPH oxidase, which produces the reactive form of oxygen called superoxide, and the mitochondria, which can also make superoxide as a byproduct of their energy-producing function.

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