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Serial changes in N-isopropyl-p[125I]-iodoamphetamine in mouse lung observed with a confocal laser scanning
Y Tatsu1, I Narabayashi, M Watanabe
1Department of Radiology, Osaka Medical College, Takatsuki, Japan. rad038@poh.osaka-med.ac.jp
Abstract:
Serial changes in N-isopropyl-p[125I]-iodoamphetamine (125I-IMP) in mouse lungs were observed with a confocal laser scanning microscope. Male mice were intravenously injected with 125I-IMP and subjected to autoradiographic procedures 20 minutes, and 3 and 24 hours after injection. Differential interference contrast (DIC) images and confocal images were obtained with a confocal laser scanning microscope, and superimposed images were evaluated. Large numbers of silver grains were observed in the interstitium, bronchioles, and alveolar sacs 20 minutes after the injection, and lamellar distribution of the grains was observed on the ciliary surface. The numbers of silver grains in the interstitium and bronchioles had decreased 3 hours after the injection of 125I-IMP, but the numbers of silver grains in the alveolar spaces had not. Although small numbers of silver grains remained in both the bronchioles and alveolar sacs 24 hours after the injection, most of them had washed out. Confocal laser scanning microscopy is considered to be a useful procedure for studying the distribution of radioisotopes by microautoradiography, because it allows clear autoradiographs to be obtained in which tissues and silver grains are perfectly matched and all silver grains are in focus.
Insights
This study tracked N-isopropyl-p[125I]-iodoamphetamine (125I-IMP) distribution in mouse lungs using confocal microscopy. Results show initial widespread lung deposition, with clearance over 24 hours, highlighting microscopy
Area of Science:
- Nuclear medicine
- Pulmonary research
- Microscopy techniques
Background:
- Investigating radiotracer distribution in lung tissue is crucial for understanding pulmonary pharmacokinetics.
- Confocal laser scanning microscopy (CLSM) offers high-resolution imaging for microautoradiography.
Purpose of the Study:
- To visualize and quantify the serial distribution of N-isopropyl-p[125I]-iodoamphetamine (125I-IMP) in mouse lungs over time.
- To evaluate the utility of CLSM for microautoradiography of radiotracers in lung tissue.
Main Methods:
- Male mice were intravenously injected with 125I-IMP.
- Autoradiography was performed at 20 minutes, 3 hours, and 24 hours post-injection.
- Confocal laser scanning microscopy with differential interference contrast (DIC) was used to obtain superimposed images.
Main Results:
- High concentrations of 125I-IMP silver grains were observed in lung interstitium, bronchioles, and alveolar sacs at 20 minutes.
- Lamellar distribution of grains noted on the ciliary surface.
- Clearance of 125I-IMP from interstitium and bronchioles by 3 hours, while alveolar spaces retained tracer; significant washout by 24 hours.
Conclusions:
- Confocal laser scanning microscopy provides clear, well-matched autoradiographs for studying radiotracer distribution.
- 125I-IMP exhibits dynamic distribution and clearance patterns in mouse lungs.
- CLSM is a valuable tool for high-resolution microautoradiographic studies in pulmonary research.