Intracellular localization of metaiodobenzyl guanidine in human neuroblastoma cells by electron spectroscopic imaging.

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 Cancer

authors

Gaze MN,Huxham IM,Mairs RJ,Barrett A

doi

10.1002/ijc.2910470615

subject

Has Abstract

pub_date

1991-04-01 00:00:00

pages

875-80

issue

6

eissn

0020-7136

issn

1097-0215

journal_volume

47

pub_type

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