کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2153410 1090181 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In vivo detection of hyperoxia-induced pulmonary endothelial cell death using 99mTc-Duramycin
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی تحقیقات سرطان
پیش نمایش صفحه اول مقاله
In vivo detection of hyperoxia-induced pulmonary endothelial cell death using 99mTc-Duramycin
چکیده انگلیسی

Introduction99mTc-duramycin, DU, is a SPECT biomarker of tissue injury identifying cell death. The objective of this study is to investigate the potential of DU imaging to quantify capillary endothelial cell death in rat lung injury resulting from hyperoxia exposure as a model of acute lung injury.MethodsRats were exposed to room air (normoxic) or > 98% O2 for 48 or 60 hours. DU was injected i.v. in anesthetized rats, scintigraphy images were acquired at steady-state, and lung DU uptake was quantified from the images. Post-mortem, the lungs were removed for histological studies. Sequential lung sections were immunostained for caspase activation and endothelial and epithelial cells.ResultsLung DU uptake increased significantly (p < 0.001) by 39% and 146% in 48-hr and 60-hr exposed rats, respectively, compared to normoxic rats. There was strong correlation (r2 = 0.82, p = 0.005) between lung DU uptake and the number of cleaved caspase 3 (CC3) positive cells, and endothelial cells accounted for more than 50% of CC3 positive cells in the hyperoxic lungs. Histology revealed preserved lung morphology through 48 hours. By 60 hours there was evidence of edema, and modest neutrophilic infiltrate.ConclusionsRat lung DU uptake in vivo increased after just 48 hours of > 98% O2 exposure, prior to the onset of any substantial evidence of lung injury. These results suggest that apoptotic endothelial cells are the primary contributors to the enhanced DU lung uptake, and support the utility of DU imaging for detecting early endothelial cell death in vivo.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Medicine and Biology - Volume 42, Issue 1, January 2015, Pages 46–52
نویسندگان
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