The results of the imaging experiment on a tumor-bearing mouse, a) localization of the three lines of tumour cells, b) localization of the labeled antibody c) localization of Zn-containing injected radioactive agent.
Metal elements such as zinc, iron and copper are present in trace amounts in the body and play an important role in myriad biological processes including gene expression, signal transduction and metabolic reactions. Abnormalities in the behaviour of these elements often reflect abnormalities in associated bio-molecules and studying them together can offer great insight into many biological processes.
Bio-molecules can be visualized in living organisms using positron emission tomography (PET), a widely used nuclear medical molecular-imaging technique.
Dr. Shuichi Enomoto, Dr. Shinji Motomura and colleagues, from the RIKEN Center for Life Science Technologies have developed a gamma-ray imaging camera enabling them to detect the gamma-rays emitted by multiple bio-metal elements in the body and study their behavior.
Their second prototype of the system, called GREI–II and presented today in the Journal of Analytical Atomic Spectrometry, enables them to visualize multiple bio-metal elements more than 10 times faster than before, and to do so simultaneously with positron emission tomography (PET).
In the study, the researchers were able to visualise two radioactive agents injected in a tumor-bearing mouse, as well as an anti-tumor antibody labelled with a PET molecular probe agent, simultaneously in the live mouse.
This new revolutionary technology is expected to offer new insights into the relationships between bio-metal elements and associated bio-molecules, and the roles they play in diseases such as diabetes and cancer.