Somewhere in the long effort to see what life is made of, a team at Bielefeld University and the University of Vienna has learned to look at a cell in two ways at once. Their microscope, described in the journal Optica and grown out of the European CHEM-SCAN project, reveals structures too small for ordinary light to separate, while also reading the chemical weather surrounding the molecules within them. The purpose beneath the instrument is an old human one: to understand how medicines meant to heal can be tuned so they reach tumors and the spreading growths that follow them. The method is sh
New FLIM-SIM Microscopy Maps Tiny Cell Structures and Their Molecular Environments
It shows where molecules sit, and the environment they are in.
Mark
So what's actually new here? Both SIM and FLIM already existed.
Mimi
The combination is the new part. SIM shows structures too small for ordinary light microscopes, and FLIM reads how long fluorescent molecules glow, which shifts with their surroundings, such as pH. Doing both at once at high resolution had been possible only to a limited extent.
Mark
Why does the glow time matter for drug research?
Mimi
CHEM-SCAN uses special fluorescent dyes that, read through FLIM, indicate the state of cancer cells. That is a way to see what a chemotherapy agent is doing inside them.
Luke
Let me mark the boundary. What has been shown?
Mimi
The capabilities were demonstrated on a human bone cancer cell line, with high resolution, fast imaging and a large field of view.
Luke
Right, and that's one cell line. The talk of improved drug understanding and live-cell applications is the researchers' outlook. The source gives no results on any drug's effect.
Mark
And the speed claim?
Luke
It's described as fast, but no frame rates or resolution figures appear in this account, so I can't tell you how fast or how fine.
Mimi
Fair. Huser calls it a basis for future applications, not a finished tool.
Mark
So what do we watch for?
Luke
Whether it gets used on real drug responses in cells, with numbers attached.
The Pulse
- Cancer drugs act inside cells in ways scientists have struggled to watch closely enough, and this new microscope aims to change that.
- Existing tools could show tiny structures or molecular lifetimes, but rarely both together at high resolution and speed.
- The team has combined structured illumination microscopy with fluorescence lifetime imaging to see structure and surrounding chemistry in one view.
- So far the technique has been demonstrated on a single human bone cancer cell line, with live-cell and drug-response studies still ahead.
Somewhere in the long effort to see what life is made of, a team at Bielefeld University and the University of Vienna has learned to look at a cell in two ways at once. Their microscope, described in the journal Optica and grown out of the European CHEM-SCAN project, reveals structures too small for ordinary light to separate, while also reading the chemical weather surrounding the molecules within them. The purpose beneath the instrument is an old human one: to understand how medicines meant to heal can be tuned so they reach tumors and the spreading growths that follow them. The method is shown so far on a single human bone cancer cell line, and its deeper promise lies in the living cell and the drugs yet to be studied within it.
Researchers at Bielefeld University and the University of Vienna have built a microscope that does two jobs at once. It reveals cell structures too small for a conventional light microscope to resolve, and it reports on the chemical surroundings of the molecules inside them. The work, published in Optica, came out of the European CHEM-SCAN project.
The method, FLIM-SIM, joins two existing techniques. Structured illumination microscopy reveals fine features below the usual resolution limit, while fluorescence lifetime imaging measures how long fluorescent molecules keep glowing, a duration that shifts with the molecular environment, such as changes in pH. Until now those lifetime readings could be combined with high-resolution imaging only to a limited extent. The new approach brings together high resolution, fast imaging and a large field of view, demonstrated on a human bone cancer cell line.
The larger purpose is practical. CHEM-SCAN is studying how chemotherapy agents might be adapted to work as effectively as possible against tumors and the metastases that grow from them. Researchers judge a drug's effect using specialized fluorescent dyes, read through lifetime measurements that reveal the state of cancer cells. As Dr. Henning Ortkraß puts it, the gain is seeing not only where molecules sit in a cell but the environment they are in.
The reasoning is that the clearer scientists can watch what a drug triggers inside individual cells, the more precisely they can study its effects, including harmful ones. Professor Thomas Huser, who coordinates CHEM-SCAN, frames the result as a new dimension of contrast for super-resolution microscopy, with fine cell structure examined at high speed alongside molecular information. The live-cell and drug-research applications remain future work, so the next thing to watch is whether the method is applied to drug responses in cells.
Researchers at Bielefeld University and the University of Vienna have built a microscope that does two jobs at once. It shows cellular structures too small for a conventional light microscope to resolve, and it also reports on the chemical surroundings of the molecules inside them. The work, published in the journal Optica, came out of the European CHEM-SCAN project.
The method is called FLIM-SIM, and it joins two existing techniques. Structured illumination microscopy, or SIM, reveals features below the resolution limit of ordinary light microscopes. Fluorescence lifetime imaging microscopy, or FLIM, measures how long fluorescent molecules keep emitting light. That duration is not fixed. It can shift with the molecular environment, a change in pH being one example.
Until now, the source says, this lifetime information could be combined with high-resolution microscopy only to a limited extent. The new technique brings together high spatial resolution, fast imaging rates and a large field of view. To demonstrate those capabilities, the team used a human bone cancer cell line.
Dr. Henning Ortkraß, an author of the study, belongs to the research group led by Professor Thomas Huser, who coordinates CHEM-SCAN. Ortkraß describes the gain in plain terms: combining super-resolution with lifetime measurements shows not only where certain molecules sit within a cell, but also the molecular environment they are in.
The larger aim of CHEM-SCAN is practical. The project is studying how chemotherapeutic agents used in cancer treatment might be adapted to work as effectively as possible against both tumors and the metastases that grow from them. To judge how well a drug is working, researchers use specialized fluorescent dyes which, read through FLIM measurements, give information about the state of cancer cells.
The reasoning is that the more clearly scientists can watch what a drug sets off inside individual cells, the more precisely they can study its effects, including potential harmful ones. The researchers say FLIM-SIM could therefore improve understanding of how drugs act at the cellular level and offer a basis for new approaches in biomedical research.
Huser frames the result as a new dimension of contrast for super-resolution microscopy. In his words, the fine structure of cells can be examined at high speed while information about their molecular environment is gathered at the same time. He calls this an important basis for future applications in live-cell and drug research.
The demonstration so far rests on a single human bone cancer cell line. The live-cell and drug-research uses are described as future applications, so the next thing to watch is whether the method is put to work on drug responses in cells.
Notable Quotes
Our results open up a new dimension of contrast for super-resolution microscopy.— Professor Thomas Huser, CHEM-SCAN coordinator
Combining super-resolution with lifetime measurements shows where molecules are in a cell and the molecular environment around them.— Dr. Henning Ortkraß (paraphrased)
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