Abstract:
:The targeted radiotherapy of neuroblastoma with 131l-labelled metaiodobenzyl guanidine (mIBG) is now the subject of several clinical studies. The precise intracellular localization of mIBG, necessary for nuclear microdosimetry, has not previously been described. We report the use of electron-energy-loss spectroscopy and electron spectroscopic imaging to establish the intracellular distribution of mIBG in cells from the human neuroblastoma line NBI-G which had been incubated with the drug by mapping iodine in ultra-thin sections of tumours. Most of the iodine is found within the mitochondria, with lesser amounts in the vesicles and on the nuclear membrane. The use of alternative radionuclides with different physical characteristics has been suggested to optimize the efficacy of this therapeutic strategy. The lack of penetration of mIBG into the nucleoplasm means that ultra-short-range Auger electron emitters such as 125I are not likely to prove more cytotoxic than 131I.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Gaze MN,Huxham IM,Mairs RJ,Barrett Adoi
10.1002/ijc.2910470615subject
Has Abstractpub_date
1991-04-01 00:00:00pages
875-80issue
6eissn
0020-7136issn
1097-0215journal_volume
47pub_type
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journal_title:International journal of cancer
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