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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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Zika Virus

Caption: Zika virus (red), isolated from a microcephaly case in Brazil. The virus is associated with cellular membranes in the center.
Credit: NIAID

Last February, the World Health Organization declared a public health emergency over concerns about very serious birth defects in Brazil and their possible link to Zika virus. But even before then, concerns about the unprecedented spread of Zika virus in Brazil and elsewhere in Latin America had prompted NIH-funded scientists to step up their efforts to combat this emerging infectious disease threat. Over the last year, research aimed at understanding the mosquito-borne virus has progressed rapidly, and we now appear to be getting closer to a Zika vaccine.

In a recent study in the journal Nature, researchers found that a single dose of either of two experimental vaccines completely protected mice against a major viral strain responsible for the Zika outbreak in Brazil [1]. Caution is certainly warranted when extrapolating these (or any other) findings from mice to people. But, taking into account the fact that researchers have already developed safe and effective human vaccines for several related viruses, the new work represents a very encouraging milestone on the road toward a much-needed Zika vaccine for humans.

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Prevent HIV AIDS

Scanning electromicrograph of an HIV-infected T cell/NIAID

Almost 37 million people around the world are now infected with human immunodeficiency virus (HIV), the virus that causes AIDS [1]. But many don’t know they are infected or lack access to medical care. Even though major strides have been made in treating the infection, less than half receive antiretroviral therapy (ART) that could prevent full-blown AIDS and reduce the likelihood of the virus being transmitted to other people. Now, a new report restores hope that an end to this very serious public health challenge could be within reach—but that will require a major boost in commitment and resources.

The study conducted by an NIH-funded research team evaluated the costs and expected life-saving returns associated with ambitious goals for HIV testing and treatment, the so-called 90-90-90 program, issued by the Joint United Nations Programme on HIV/AIDS (UNAIDS) in 2014 [2]. The new analysis, based on HIV disease progression and treatment data in South Africa, finds that those goals, though expensive to implement, can be achieved cost-effectively, potentially containing the AIDS epidemic and saving many millions of lives around the globe.

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Cross section of the Zika virus


Credit: David Goodsell, The Scripps Research Institute

This lively interplay of shape and color is an artistic rendering of the Zika virus preparing to enter a cell (blue) by binding to its protein receptors (green). The spherical structures (pink) represent two Zika viruses in a blood vessel filled with blood plasma cells (tan). The virus in the middle in cross section shows viral envelope proteins (red) studding the outer surface, with membrane proteins (pink) embedded in a fatty layer of lipids (light purples). In the innermost circle, you can see the viral genome (yellow) coiled around capsid proteins (orange).

This image was sketched and hand-painted with watercolors by David Goodsell, a researcher and illustrator at The Scripps Research Institute, La Jolla, CA. Goodsell put paint and science to paper as part of the “Molecule of the Month” series run by RCSB Protein Data Bank (PDB), which NIH co-supports with the National Science Foundation and the Department of Energy. The PDB, which contains structural data on thousands of proteins and small molecules, uses its “Molecule of the Month” series to help students visualize a molecule or virus and to encourage their exploration of structural biology and its applications to medicine.

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Zike virus infection

Caption: Human neural progenitor cells (gray) infected with Zika virus (green) increased the enzyme caspase-3 (red), suggesting increased cell death.
Credit: Sarah C. Ogden, Florida State University, Tallahassee

Recently, public health officials have raised major concerns over the disturbing spread of the mosquito-borne Zika virus among people living in and traveling to many parts of Central and South America [1]. While the symptoms of Zika infection are typically mild, grave concerns have arisen about its potential impact during pregnancy. The concerns stem from the unusual number of births of children with microcephaly, a very serious condition characterized by a small head and damaged brain, coinciding with the spread of Zika virus. Now, two new studies strengthen the connection between Zika and an array of birth defects, including, but not limited to, microcephaly.

In the first study, NIH-funded laboratory researchers show that Zika virus can infect and kill human neural progenitor cells [2]. Those progenitor cells give rise to the cerebral cortex, a portion of the brain often affected in children with microcephaly. The second study, involving a small cohort of women diagnosed with Zika virus during their pregnancies in Rio de Janeiro, Brazil, suggests that the attack rate is disturbingly high, and microcephaly is just one of many risks to the developing fetus. [3]

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