Many of the key players in regulating apoptosis were discovered in C. elegans. This tiny roundworm has more than 19,000 genes, and a vast number of them are very similar to genes in other organisms, including people. Credit: Ewa M. Davison.
Our cells come equipped with a self-destruct mechanism that’s activated during apoptosis, a carefully controlled process by which the body rids itself of unneeded or potentially harmful cells. Scientists have long known that a protein called PSR-1 helps clean up the cellular remains. Now they’ve found that PSR-1 also can repair broken nerve fibers.
Ding Xue of the University of Colorado, Boulder, and others made the finding in the tiny roundworm C. elegans, which scientists have used to study apoptosis and identify many of the genes that regulate the process. While apoptotic cells sent “eat me” signals to PSR-1, injured nerve cells sent “save me” signals to the protein. These SOS signals helped reconnect the broken nerve fibers, called axons, that would otherwise degenerate after an injury. Continue reading
Credit: Karen Carlson
Fields: Systems biology, bacterial biofilms
Born and raised in: Alaska
Undergraduate student at: The University of Alaska, Anchorage
When not in the lab, she’s: Out and about with her 3-year-old son, friends and family
Secret talent: “I make some really good cookies.”
Karen Carlson got a surprise in her 10th grade biology class. Not only did she find out that she enjoyed science (thanks to an inspiring teacher), but, as she puts it, “I realized that I was really good at it.”
In particular, she says, “I was good at putting all the pieces [of a scientific question] together. And that’s what I had the most fun with—looking at systems: how things fit together and the flow between them.”
These are perfect interests for a budding systems biologist, which is what Carlson is on her way to becoming. She’s a senior in college on track to graduate this year with a bachelor’s degree in biology from the University of Alaska, Anchorage (UAA). Next, she plans to enroll in a master’s degree program at UAA, and eventually to pursue a Ph.D. in a biomedical field. Continue reading
Biologists use math in a variety of ways, from designing experiments to mapping complex biological systems. Credit: Stock image.
On Saturday (at 9:26:53 to be exact), math lovers and others around the world will celebrate Pi—that really long number that represents the ratio of the circumference of a circle to its diameter. I asked our scientific experts why math is important to biomedical research. Here are a few reasons.
- Math allows biologists to describe how molecules move in and out of cells, how bacteria shuttle through blood vessels, how drugs get broken down in the body and many other physiological processes.
- Studying the geometry, topology and other physical characteristics of DNA, proteins and cellular structures has shed light on their functions and on approaches for enhancing or disrupting those functions.
- Math helps scientists design their experiments, including clinical trials, so they result in meaningful data, a.k.a statistical significance.
- Scientists use math to piece together all the different parts of a cell, an organ or an entire organism to better understand how the parts interact and how perturbations in these complex systems may contribute to disease.
- Sometimes it’s impossible or too difficult to answer a research question through traditional lab experiments, so biologists rely on math to develop models that represent the system they’re studying, whether it’s a metastasizing cancer cell or an emerging infectious disease. These approaches allow scientists to indicate the likelihood of certain outcomes as well as refine the research questions.
Want more? Here’s a video with 10 reasons biologists should know some math.
While studying how the brain controls REM sleep, researchers focused on areas abbreviated LDT and PPT in the mouse brainstem. This illustration shows where these two areas are located in the human brain. Credit: Wikimedia Commons. View larger image
Has the “spring forward” time change left you feeling drowsy? While researchers can’t give you back your lost ZZZs, they are unraveling a long-standing mystery about sleep. Their work will advance the scientific understanding of the process and could improve ways to foster natural sleep patterns in people with sleep disorders.
Working at Massachusetts General Hospital and MIT, Christa Van Dort , Matthew Wilson and Emery Brown focused on the stage of sleep known as REM. Our most vivid dreams occur during this period, as do rapid eye movements, for which the state is named. Many scientists also believe REM is crucial for learning and memory.
REM occurs several times throughout the night, interspersed with other sleep states collectively called non-REM sleep. Although REM is clearly necessary—it occurs in all land mammals and birds—researchers don’t really know why. They also don’t understand how the brain turns REM on and off. Continue reading
To help the public better understand how measles can spread, a team of infectious disease computer modelers at the University of Pittsburgh has launched a free, mobile-friendly tool that lets users simulate measles outbreaks in cities across the country.
The tool is part of the Pitt team’s Framework for Reconstructing Epidemiological Dynamics, or FRED, that it previously developed to simulate flu epidemics. FRED is based on anonymized U.S. census data that captures demographic and geographic distributions of different communities. It also incorporates details about the simulated disease, such as how contagious it is.
A free, mobile-friendly tool lets users simulate potential measles outbreaks in cities across the country. Credit: University of Pittsburgh Graduate School of Public Health.
Visualizations can give scientists unprecedented views of complex biological processes. Here’s a look at two new ones that shed light on how HIV enters host cells.
Animation of HIV’s Entry Into Host Cells
This video animation of HIV’s entry into a human immune cell is the first one released in Janet Iwasa’s current project to visualize the virus’ life cycle. As they’re completed, the animations will be posted at http://scienceofhiv.org
We previously introduced you to Janet Iwasa, a molecular animator who’s visualized complex biological processes such as cells ingesting materials and proteins being transported across a cell membrane. She has now released several animations from her current project of visualizing HIV’s life cycle . The one featured here shows the virus’ entry into a human immune cell.
“Janet’s animations add great value by helping us consider how complex interactions between viruses and their host cells actually occur in time and space,” says Wes Sundquist, who directs the Center for the Structural Biology of Cellular Host Elements in Egress, Trafficking, and Assembly of HIV at the University of Utah. “By showing us how different steps in viral replication must be linked together, the animations suggest hypotheses that hadn’t yet occurred to us.” Continue reading
Fluorescent sensors at the cell surface show zinc-rich packages being released from the egg during fertilization. Credit: Northwestern Visualization. View video
Whether aiding in early growth and development, ensuring a healthy nervous system or guarding the body from illness, zinc plays an important role in the human body.
Husband-and-wife team, Thomas O’Halloran and Teresa Woodruff , plus other researchers at Northwestern University, evaluated the role that zinc plays in healthy fertilization . The study revealed how mouse eggs gather and release billions of zinc atoms at once in events called zinc sparks. These fluxes in zinc concentration are essential in regulating the biochemical processes that facilitate the egg-to-embryo transition.
The scientists developed a series of techniques to determine the amount and location of zinc atoms during an egg cell’s maturation and fertilization as well as in the following two hours. Special imaging methods allowed the researchers to also visualize the movement of zinc sparks in three dimensions. Continue reading
Researchers are developing a system to remotely control genes or cells in living animals with radio wave technology similar to that used to operate remote control car keys. Credit: Stock image.
One of the items on biomedical researchers’ “to-do” list is devising noninvasive ways to control the activity of specific genes or cells in order to study what those genes or cells do and, ultimately, to treat a range of human diseases and disorders.
A team of scientists recently reported progress on a new, noninvasive system that could remotely and rapidly control biological targets in living animals . The system can be activated remotely using either low-frequency radio waves or a magnetic field. Similar radio wave technology operates automatic garage-door openers and remote control car keys and is used in medicine to control electronic pacemakers noninvasively. Magnetic fields are used to activate sensors in burglar alarm systems and to turn your laptop to hibernate mode when the cover is closed. Continue reading
Credit: Actuated Medical, Inc.
Maureen L. Mulvihill, Ph.D.
Fields: Materials science, logistics
Works at: Actuated Medical, Inc., a small company that develops medical devices
Second job (volunteer): Bellefonte YMCA Swim Team Parent Boost Club Treasurer
Best skill: Listening to people
Last thing she does every night: Reads to her 7- and 10-year-old children until “one of us falls asleep”
If you’re a fan of the reality TV show Shark Tank, you tune in to watch aspiring entrepreneurs present their ideas and try to get one of the investors to help develop and market the products. Afterward, you might start to think about what you could invent.
Maureen L. Mulvihill has never watched the show, but she lives it every day. She is co-founder, president and CEO of Actuated Medical, Inc. (AMI), a Pennsylvania-based company that develops specialized medical devices. The devices include a system for unclogging feeding tubes, motors that assist MRI-related procedures and needles that gently draw blood.
AMI’s products rely on the same motion-control technologies that allow a quartz watch to keep time, a microphone to project sound and even a telescope to focus on a distant object in a sky. In general, the devices are portable, affordable and unobtrusive, making them appealing to doctors and patients.
Mulvihill, who’s trained in an area of engineering called materials science, says, “I’m really focused on how to translate technologies into ways that help people.” Continue reading
NIGMS’ Jean Chin answers questions about a new device for untangling proteins. Credit: National Institute of General Medical Sciences.
It’s not every day that we log into Facebook and Twitter to see conversations about denaturing proteins and the possibility of reducing biotechnology costs, but that changed last week when a story about “unboiling” eggs became a trending topic.
Since NIGMS partially funded the research advance that led to the media scramble, we asked our scientific expert Jean Chin to tell us more about it.
What’s the advance?
Gregory Weiss of the University of California, Irvine, and his collaborators have designed a device that basically unties proteins that have been tangled together. Continue reading