Binding of the hypoxia tracer [3H]misonidazole in cerebral ischemia.

Abstract:

:Radiolabelled misonidazole, a radiosensitizing drug that binds to viable hypoxic tumor cells, may be useful in identifying hypoxic cells in cerebrovascular disease. Its potential was investigated in the gerbil stroke model. Biodistribution of [3H]misonidazole was measured in normal gerbils and animals that had been subjected to right common carotid artery ligation to produce cerebral ischemia. The uptake of [3H]misonidazole in the right cerebral hemisphere and right/left hemispheral uptake ratios correlated positively with the severity of the stroke when measured 6-9 hours after carotid ligation. Histologic studies in symptomatic ligated animals showed ipsilateral widespread but patchy acute ischemic changes as well as areas that showed no morphological changes. Microscopic autoradiography in these animals showed diffuse heavy labelling only in the ipsilateral hemisphere. This was over areas that had histological damage as well as in adjacent areas that appeared intact. Studies comparing blood flow measured with [14C]iodoantipyrine and [3H]misonidazole retention in gerbils with carotid artery ligations indicated that flow is not a major determinant of retention of this hypoxia tracer. We conclude that a misonidazole congener labelled with a gamma- or positron-emitting isotope may be useful in nuclear imaging of the degree and regional distribution of hypoxic tissue in cerebrovascular disease.

journal_name

Stroke

journal_title

Stroke

authors

Hoffman JM,Rasey JS,Spence AM,Shaw DW,Krohn KA

doi

10.1161/01.str.18.1.168

subject

Has Abstract

pub_date

1987-01-01 00:00:00

pages

168-76

issue

1

eissn

0039-2499

issn

1524-4628

journal_volume

18

pub_type

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