Mouse Study Finds Microbe Might Protect against Food Poisoning

T mu in a mouse colon

Caption: Scanning electron microscopy image of T. mu in the mouse colon.
Credit: Aleksey Chudnovskiy and Miriam Merad, Icahn School of Medicine at Mount Sinai

Recently, we humans have started to pay a lot more attention to the legions of bacteria that live on and in our bodies because of research that’s shown us the many important roles they play in everything from how we efficiently metabolize food to how well we fend off disease. And, as it turns out, bacteria may not be the only interior bugs with the power to influence our biology positively—a new study suggests that an entirely different kingdom of primarily single-celled microbes, called protists, may be in on the act.

In a study published in the journal Cell, an NIH-funded research team reports that it has identified a new protozoan, called Tritrichomonas musculis (T. mu), living inside the gut of laboratory mice. That sounds bad—but actually this little wriggler was potentially providing a positive benefit to the mice. Not only did T. mu appear to boost the animals’ immune systems, it spared them from the severe intestinal infection that typically occurs after eating food contaminated with toxic Salmonella bacteria. While it’s not yet clear if protists exist that can produce similar beneficial effects in humans, there is evidence that a close relative of T. mu frequently resides in the intestines of people around the world.

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Managing Chronic Pain: Opioids Are Often Not the Answer

Opioids and researchThe term “silent epidemic” sometimes gets overused in medicine. But, for prescription opioid drugs, the term fits disturbingly well. In 2012, more than 259 million prescriptions were written in the United States for Vicodin, OxyContin, and other opioid painkillers. That equals one bottle of pain pills for every U.S. adult. And here’s an even more distressing statistic: in 2011, overdoses of prescription painkillers, most unintentional, claimed the lives about 17,000 Americans—46 people a day [1].

The issue isn’t whether opioid painkillers have a role in managing chronic pain, such as that caused by cancer or severe injuries. They do. What’s been lacking is an unbiased review of the scientific literature to examine evidence on the safety of long-term prescription opioid use and the impact of such use on patients’ pain, function, and quality of life. The NIH Office of Disease Prevention (ODP) recently convened an independent panel to conduct such a review, and what it found is eye-opening. People with chronic pain have often been lumped into a single category and treated with generalized approaches, even though very little scientific evidence exists to support this practice.

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