Related Experiment Videos
Mapping the cellular distribution of labelled molecules by SIMS microscopy
E Hindie1, B Coulomb, R Beaupain
1Laboratoire de Biophysique, SC27 de l'Inserm, Créteil, France.
Biology of the Cell
|January 1, 1992
Summary
Ion microscopy enables precise isotopic analysis for studying molecular distribution in cells. This technique offers high sensitivity and resolution for tracking labeled molecules in biological and disease research.
Area of Science:
- Biophysics
- Cell Biology
- Analytical Chemistry
Background:
- Isotopic analysis is a powerful tool for tracking molecules in biological systems.
- Ion microscopy offers high spatial resolution for cellular imaging.
Purpose of the Study:
- To investigate the cellular distribution of molecules labeled with carbon-14 and stable isotopes using ion microscopy.
- To evaluate the sensitivity, speed, and quantitative capabilities of ion microscopy for biological tracer studies.
Main Methods:
- Utilized ion microscopy with an ion beam (e.g., O2+, Cs+) to bombard sample surfaces.
- Employed mass spectrometry to filter secondary ions and record the distribution of labeling isotopes.
- Achieved spatial resolution close to 0.1 micron with the UPS-ONERA ion microprobe.
Main Results:
- Obtained images showing the distribution of 14C-thymidine and D-arginine in human fibroblasts.
- Visualized the distribution of 15N-adenine in human breast cancer cell cultures.
- Demonstrated superior sensitivity for carbon-14 detection compared to autoradiography.
Conclusions:
- Ion microscopy provides a fast, quantitative, and highly sensitive method for studying labeled molecule distribution at the cellular level.
- This technique facilitates biological and pharmacological tracer studies for human diseases using stable isotopes.