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What Happens to Medicine in Your Body?

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Cutaway diagram of the human body (head, arms, and torso) showing the blood (arteries in red and veins in blue) and internal organs. Drug delivery is shown by intravenous drip with a blue arrow into the arm, medicine tablet with a black arrow into the mouth, and inhaler with a blue arrow through the mouth into both lungs. The life of the drug in the body is shown by black arrows from mouth to stomach, from stomach to liver, from liver to heart, from blood to kidney, and from liver to intestines.
Medicines administered orally, by inhaler, and intravenously enter the stomach, lungs, and veins, respectively. They’re absorbed, then circulate throughout the body in the blood, are processed by the liver, and excreted by the kidneys and intestines. Credit: NIGMS.

Have you ever wondered what happens inside your body when you take a medicine? An area of pharmacology called pharmacokinetics is the study of precisely that. Here, we follow a medicine as it enters the body, finds its therapeutic target (also called the active site), and then eventually leaves the body.

To begin, a person takes or is given a dose of medicine by a particular route of administration, such as by mouth (oral); through the skin (topical), mucous membranes
(nasal), or lungs (inhaled); or through a needle into a muscle (intramuscular) or into a vein (intravenous). Sometimes medicines can be administered right where they’re needed, like a topical antibiotic ointment on a scrape, but most medicines need to enter the blood to reach their therapeutic target and be effective. Those are the ones we’ll continue following, using the common pharmacokinetic acronym ADME:

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Q&A With Dylan Burnette: Muscle Cells, Cell Movement, and Microscopy

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A headshot of Dr. Dylan Burnette.
Courtesy of Dr. Dylan Burnette.

“We scientists know very little of what can be known—I find that invigorating,” says Dylan Burnette, Ph.D., an associate professor of cell and developmental biology at Vanderbilt University School of Medicine in Nashville, Tennessee. “Most people find it exhausting, but I’m comfortable with not knowing all of biology’s secrets.” In an interview, Dr. Burnette shared his lab’s work on muscle cells, the knowledge he hopes readers take away from his research, and some advice to future scientists about being comfortable being wrong.

Q: How did you first become interested in science?

A: Unlike with other subjects (it took me a long time to learn how to read), I excelled at science. In third-grade science class, I knew every answer on the tests. It didn’t occur to me at the time, but I did well because I found it interesting. I decided I wanted to become a medical doctor that year. Back then, doctors were the only type of person who I thought did any type of science.

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Bridging the Representation Gap in Biomedical Research

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“We hope that students come out of our program feeling like they’re part of a community. Many of us feel inadequate or struggle in some way during graduate school—it can be a challenging time. I want to build a community that our students can always come back to for support,” says Elana Ehrlich, Ph.D., the co-director of the Bridges to the Doctorate Research Training Program (B2D) at Towson University (TU), in Towson, Maryland, alongside Michelle Snyder, Ph.D..

The TU B2D is one of several NIGMS-supported B2Ds, which are dedicated to developing a diverse pool of well-trained biomedical scientists who will transition from master’s degree programs to research-based doctoral degree programs. B2Ds partner with Ph.D.-granting institutions to help aid students in the master’s-to-Ph.D. transition. Students in all B2Ds earn a thesis-based master’s degree and receive training to design, conduct, and analyze experiments effectively. At the same time, these students learn how to build successful applications for doctoral programs, whether they apply to the B2D’s partner school or another Ph.D. program.

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Up Your Game With NIH Kahoot! Quizzes

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NIH and Kahoot! logos on an abstract gray and purple background.
NIH is now a premium partner with Kahoot! Credit: NIGMS.

We’re excited to announce our new partnership with Kahoot! Although we aren’t new Kahoot! gamers, we’ve recently partnered with them to provide you quizzes from across the National Institutes of Health (NIH) in a single place. “Reaching young people to teach them about biomedical science and inspire them to pursue careers in science is critically important to ensuring a diverse and vibrant biomedical research enterprise,” says NIGMS Director Jon Lorsch, Ph.D. “Our partnership with Kahoot! expands NIH’s STEM offerings, providing educators with free, interactive learning tools to spark student interest in health sciences.”

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What Is Pharmacology?

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A collage of different cartoon images showing scientists working across a spectrum of basic science, chemistry, biology, research, genetics, and medicine, illustrated by images of an EKG readout, test tubes and a pipette, a syringe and medicine bottle, a chemical structure, a microscope, a pill bottle and pill, a data chart, a hospital, a DNA strand, and a human silhouette.
Credit: iStock.

Pharmacology is the study of how molecules, such as medicines, interact with the body. Scientists who study pharmacology are called pharmacologists, and they explore the chemical properties, biological effects, and therapeutic uses of medicines and other molecules. Their work can be broken down into two main areas:

  • Pharmacokinetics is the study of how the body acts on a medicine, including its processes of absorption, distribution, metabolism, and excretion (ADME).
  • Pharmacodynamics is the study of how a medicine acts in the body—both on its intended target and throughout all the organs and tissues in the body.
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Copper Keeps Us Going

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Copper pipes, copper wires, copper…food? Copper is not only a useful metal for conducting electricity, but it’s also an essential element we need in our bodies for a variety of important activities—from metabolizing iron to pigmenting skin.

A graphic showing copper’s symbol Cu, atomic number 29, and atomic weight 63.546, all connected by lines to illustrations of the Statue of Liberty, a lightning bolt labeled “conductor,” and a crab labeled “blue blood.” New York’s Statue of Liberty is coated in 80 tons of copper, and oxidation causes its green color. Copper is an excellent conductor of electricity. It’s used in wiring, electronics, and lightning conductors. Crustaceans use copper complexes to transport oxygen in their blood, giving it a blue color. Across the bottom is the logo for the Royal Society of Chemistry celebrating IYPT 2019, the Compound Interest logo, and #IYPT2019. Copper is required to keep your body going. Enzymes that use copper are called cuproenzymes, and they catalyze a wide range of reactions, including making neurotransmitters and connective tissue. The element is found on the Statue of Liberty’s covering, in wiring and electronics, and in the blue blood of crustaceans. Credit: Compound Interest CC BY-NC-ND 4.0. Click to enlarge.
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Investigating the Secrets of Cancer-Causing Viruses

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A portrait of Dr. Mandy Muller.
Credit: Courtesy of Dr. Mandy Muller.

While she was in graduate school, Mandy Muller, Ph.D., became intrigued with viruses that are oncogenic, meaning they can cause cancer. At the time, she was researching human papillomaviruses (HPVs), which can lead to cervical and throat cancer, among other types. Now, as an assistant professor of microbiology at the University of Massachusetts (UMass) Amherst, Dr. Muller studies Kaposi sarcoma-associated herpesvirus (KSHV), which causes the rare AIDS-associated cancer Kaposi sarcoma.

A Continental Change

Dr. Muller has come a long way, both geographically and professionally, since her childhood in France. She was the first person in her family to graduate from high school, where she excelled in science, and went on to attend École Normale Supérieure (ENS) de Lyon, a research-oriented undergraduate institution in Lyon, France. “We spent weeks at a time in laboratory-based classes, working in real labs. That’s when I realized people could do research full-time, which caught my attention,” says Dr. Muller. She double-majored in biology and geology, and soon chose to focus her career on immunology and virology.

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Why Am I So Tired?

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An alarm clock rests on top of a model of the human brain. In the background, gold stars against a dark blue backdrop represents nighttime (left), and white and light blue clouds against a light blue backdrop represents daytime (right).
Circadian rhythms control the timing of many daily changes in your body. Credit: iStock.

If you struggle to wake up in time for school or work or feel drowsy during a trip abroad, your circadian rhythms may be out of sync with your environment. Circadian rhythms are your internal timekeepers, and almost all organisms, from bacteria to plants and animals, have them. You can’t see them, but you can feel their effects—they control when you get sleepy, when you wake up in the morning, and when you feel hungry. Among other signals, the brain uses sunlight to keep time.

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Career Conversations: Q&A With Biomedical Engineer Elizabeth Wayne

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A portrait image of Dr. Elizabeth Wayne.
Courtesy of Dr. Elizabeth Wayne.

“It’s so fun to try to make meaning from a confusing experimental result and talk to other scientists who are excited by the same questions you are,” says Elizabeth Wayne, Ph.D., an assistant professor of biomedical engineering and chemical engineering at Carnegie Mellon University (CMU) in Pittsburgh, Pennsylvania. We talked to Dr. Wayne about her career trajectory, research on immune cells, and belief that scientists can change the world.

Q: How did you first become interested in science?

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