Two New Imaging Technologies Promise Sharper Views of Life's Molecular Machinery
Scientists have announced two distinct breakthroughs in biological imaging, designed to revolutionize how we visualize proteins within living systems. One technique dramatically reduces background noise in fluorescence, while the other merges structural and molecular views at the nanoscale.
Technology 1: Visible-Spectrum Fluorescent Nanobodies (VIS-Fbs)
Researchers at the Albert Einstein College of Medicine and the Salk Institute have developed a new class of probes called visible-spectrum target-stabilizable fluorescent nanobodies (VIS-Fbs) .
How It Works
These probes are engineered from nanobodies—tiny, antibody-like protein fragments. They are designed to become stable and fluoresce only when bound to their specific target protein. This "smart" activation mechanism reduces background noise by up to 100-fold compared to traditional fluorescent probes.
The platform integrates over 20 different fluorescent proteins and biosensors into multiple nanobody scaffolds. As a result, VIS-Fb probes cover nearly the entire visible spectrum, from blue to far red, enabling multicolor imaging of several proteins within a single cell. Certain variants can be activated or switched off with light, and some incorporate biosensors to report on protein activity, such as ion or metabolite levels.
Key Demonstrations
- In mouse models, the probes enabled selective labeling and ratiometric imaging of calcium activity in neurons and astrocytes during behavior.
- In zebrafish embryos, the technology allowed real-time tracking of dynamic changes during early development and in response to drugs that alter signaling pathways.
Publication & Funding
The research was published in the journal Nature Methods on April 22, 2026. Co-corresponding authors included Dr. Vladislav Verkhusha (Albert Einstein College of Medicine) and Dr. Axel Nimmerjahn (Salk Institute), with Dr. Natalia Barykina serving as first author. The study was supported by grants from the National Institutes of Health, the Jane and Aatos Erkko Foundation, the Research Council of Finland, the Chan Zuckerberg Initiative Foundation, the NOMIS Foundation Neuroimmunology Initiative, the Edwards-Yeckel Research Foundation, and the Finland Cancer Foundation.
Technology 2: Multicolor Electron Microscopy
A separate team from Harvard University has developed a new technique called multicolor electron microscopy, set to be presented at the 70th Biophysical Society Annual Meeting in San Francisco (February 21–25, 2026).
How It Works
This method combines the structural power of electron microscopy with the molecular specificity of fluorescence microscopy. The system uses a single electron beam for both tasks, eliminating the need to switch between instruments. Probes attached to proteins emit visible light when excited by electrons—a process known as cathodoluminescence. The same electron beam provides both the colored signal from the probes and the detailed, black-and-white structural image.
The team reported that standard fluorescent dyes, as well as previously-developed lanthanide nanoparticles, can emit visible light when excited by electrons.
Key Demonstrations
The technique has been successfully demonstrated in mammalian cells and biological tissues, including fungus-infected flies.
Future Goals
Researchers plan to adapt the technique for use with ultrathin sections of cell-embedded matrices and cryo-electron microscopy. This would enable 3D reconstructions of cells in their natural, hydrated state at nanometer resolution.
Authorship
The research was developed by Debsankar Saha Roy and Maxim Prigozhin at Harvard University.