원저 : 실험적 뇌허혈증 모델에서 허혈 조직의 99mTc - glucarate 섭취 ( 99mTc - Glucarate Uptake in Ischemic Tissue of Experimental Models of Cerebral Ischemia ) () |
Author |
정재민(Jae Min Jeong),이동수(Dong Soo Lee),김영주(Young Ju Kim),최석례(Seok Rye Choi),김채균(Chae Kyun Kim),마응천(Woong Chun Mar),정준기(June Key Chung),이명철(Myung Chul Lee),고창순(Chang Soon Koh), |
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Affiliation |
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Abstract |
To detect ischemic tissue in experimental model of
cerebral ischemia made by middle cerebral artery(MCA)-
occlusion, we acquired triple image of Tc-99m-
glucarate, [18F]fluoro-deoxyglucose (FDG), and 2,3,5-
triphenyltetrazolium (TTC) staining. We made cerebral
infarction either with reperfusion (after occlusion of
2 hours) or without reperfusion in 10 Sprague-Dawley
rats by inserting thread to MCA through internal
carotid artery. After 22 hours, we injected 740 MBq of
Tc-99m-glucarate and 55.5 MBq of [18F]FDG through tail
vein. Each 1 mm slice of rat brains was frozen and
exposed to imaging plate for 20 minutes in freezer to
get an [18F]FDG image. After 20 hours enough to fade
radioactivity of [18F]FDG, the slices were again imaged
by BAS1500 for Tc-99m-glucarate uptake¡¤Finally,
these braim tissues were stained with TTC. semi-
quantitative visual analysis was done by grading 0 to 3
points according to the degree of uptakes(Tc-99m-
glucarate) and decreased uptakes([18F]FDG and TTC). Ten
rats survived with neurologic symptoms. TTC staining
confirmed the development of infarction. The size of
the infarction was relatively larger in the group
without reperfusion. [18F]FDG images were similar to
TTC-stained images. However, we found regions with
intermediate uptake which were not stained with TTC. We
found regions with intermediate [18F]FDG uptake where
TTC staining was normal. Tc-99m-glucarate uptake was
found only in TTC non-stained region. In the TTC
stained regions, there were no uptake of Tc-99m-
glucarate. We could not find clear relation between Tc-
99m- glucarate uptake with [18F]FDG uptake. This was
partly because percent uptake of Tc-99m- glucarate was
so small (less than 1 percent of injected dose) and
because there were quite heterogeneity of patterns of
[18F]FDG uptake and TTC. With these findings, we could
conclude that Tc-99m-glucarate were taken up only in
part of ischemic tissues which were proven to be
nonviable. The establishment of MCA-occluded rat model
with or without reperfusion and triple imaging for Tc-
99m, 18F and TTC helped the characterzation of Tc-99m-
glucarate uptakes. Further work is needed to clarify
the meaning of diversities of [18F]FDG and TTC and
their relation with Tc-99m-glucarate. |
Keyword |
99mTc-glucarate, dual-isotope autoradiography, ischemia, [18F]FDG |
Full text Article |
28501812.pdf
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