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Meeting ReportGeneral Clinical Specialties Track

Evaluating anti-inflammatory effect of alkaline protease using 18F-FDG PET in mouse inflammatory bowel disease

Juri Na, Young Hwa Kim, Michael J. Parmely, Kee-jong Hong, Keon Wook Kang, Hyewon Youn and June-Key Chung
Journal of Nuclear Medicine May 2016, 57 (supplement 2) 647;
Juri Na
3Biomedical Science Seoul National University Seoul Korea, Republic of
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Young Hwa Kim
5Nuclear Medicine Seoul National University Seoul Korea, Republic of
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Michael J. Parmely
7Molecular Genetics and Immunology University of Kansas Medical Center Kansas City MO United States
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Kee-jong Hong
1Institute of Pasteur Korea, International Vaccine Institute Seoul Korea, Republic of
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Keon Wook Kang
2Seoul National University Seoul Korea, Republic of
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Hyewon Youn
4Cancer imaging center Seoul National University Seoul Korea, Republic of
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June-Key Chung
6Seoul National University Hospital Chongro-Gu
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Abstract

647

Objectives Alkaline protease (AP) reduces the progress of TNF-α-induced mouse inflammatory bowel disease. FDG-PET provides accurate, non-invasive visualization of inflammation. We investigated whether FDG-PET imaging is useful to detect therapeutic response of alkaline protease in acute inflammatory bowel disease (IBD).

Methods Rectal administration of the hapten reagent oxazolone dissolved in ethanol induces a severe IBD in C56BL/6 mice. The mice are divided into three groups: Control, Oxa, and Oxa+AP administered mice. After 4 hours of oxazolone administration, FDG-PET images were acquired using small animal PET/X-ray scanner. PET data were acquired from whole body approximately 60 min after intravenous administration of 50 μCi of 18F-FDG. The mice were sacrificed and the colon was removed. Ex vivo PET images were acquired. To determine whether AP blocks TNF-α activity in this acute inflammation induced mice, samples of their intestines were collected. And then TNF-α immunostaining of intestines was carried out.

Results Oxazolone treated mouse model showed swelled intestine and darker color than the other group. Immunohistochemistry assay showed less TNF-α staining in villous epithelium of group Oxa+AP than of group Oxa. FDG uptake increased 2.0 times of control when oxazolone had treated (p=0.016). However, FDG uptake increased 1.4 times of control when oxazolone and AP administered together (p=0.001).

Conclusions Pretreatment of alkaline protease reduced not only TNF-α expression but also FDG uptake. FDG-PET shows therapeutic effect of AP in mouse IBD.

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Journal of Nuclear Medicine
Vol. 57, Issue supplement 2
May 1, 2016
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Evaluating anti-inflammatory effect of alkaline protease using 18F-FDG PET in mouse inflammatory bowel disease
Juri Na, Young Hwa Kim, Michael J. Parmely, Kee-jong Hong, Keon Wook Kang, Hyewon Youn, June-Key Chung
Journal of Nuclear Medicine May 2016, 57 (supplement 2) 647;

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Evaluating anti-inflammatory effect of alkaline protease using 18F-FDG PET in mouse inflammatory bowel disease
Juri Na, Young Hwa Kim, Michael J. Parmely, Kee-jong Hong, Keon Wook Kang, Hyewon Youn, June-Key Chung
Journal of Nuclear Medicine May 2016, 57 (supplement 2) 647;
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