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- W2169228727 abstract "Accelerated cardiac washout of <sup>123</sup>I-metaiodobenzylguanidine (MIBG), which is clinically used as an index of cardiac neuropathy in diabetes, is ascribed to decreased norepinephrine reuptake into synaptic vesicles. However, accelerated washout frequently contrasts with preserved early tracer uptake, whose significance remains undetermined. The aim of this study was to investigate in a mouse model of long-lasting type II diabetes whether the mismatch between MIBG early uptake and washout is the consequence of a more generalized disorder of the autonomic nervous system. <b>Methods:</b> Nine mice were given low doses of streptozotocin by intraperitoneal injection for 5 consecutive days. At 7 mo after streptozotocin, MIBG kinetics were evaluated by heart and liver time–activity curves and by tracer accumulation in the bladder. Data were compared with those obtained in 10 sham mice and correlated with the cardiac and hepatic tissue expression of norepinephrine transporter (NET) as assessed with a <sup>3</sup>H-desipramine saturation binding assay. <b>Results:</b> In diabetic mice, myocardial and liver MIBG retention was reduced at 2 h and was associated with both increased tracer washout and reduced NET density. The rate of myocardial washout correlated with the degree of urinary MIBG excretion. <b>Conclusion:</b> The paradoxic observation of preserved early uptake associated with accelerated washout of MIBG in diabetes seems to be explained by a generalized disorder in NET function leading to reduced whole-body tracer removal from the blood and increased tracer availability for early myocardial uptake." @default.
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- W2169228727 date "2008-09-15" @default.
- W2169228727 modified "2023-10-14" @default.
- W2169228727 title "Whole-Body Evaluation of MIBG Tissue Extraction in a Mouse Model of Long-Lasting Type II Diabetes and Its Relationship with Norepinephrine Transport Protein Concentration" @default.
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- W2169228727 doi "https://doi.org/10.2967/jnumed.108.054361" @default.
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