Pharmacokinetics and metabolism of 123I-BMIPP fatty acid analog in healthy and CD36-deficient subjects.
Some have suggested that CD36, which is a multifunctional receptor with a molecular weight of 88 kDa, functions as a long-chain fatty acid (LCFA) transporter. We recently reported on a complete myocardial accumulation defect of the radiolabeled LCFA analog (123)I-15-(p-iodophenyl)-(R,S)-methylpentadecanoic acid (BMIPP) in patients with CD36 deficiency. In this study, we investigated the pharmacokinetics of BMIPP in patients with a myocardial accumulation defect of BMIPP accompanied by CD36 deficiency. METHODS: Five patients (3 men, 2 women) with CD36 deficiency and 3 healthy men were investigated. Serial myocardial images were obtained every 70 s for 20 min (dynamic acquisition) and at 30, 60, 120, 180, and 240 min (static acquisition) after an intravenous bolus injection of 148 MBq BMIPP. Whole-body imaging was performed 60 min after injection. Plasma levels of BMIPP and its final metabolite, piodophenylacetic acid, at 2, 5, 10, 30, 60, 120, and 240 min after administration were determined. RESULTS: In the CD36-deficient patients, myocardial images could not be obtained for up to 240 min after administration, and cardiac pool images showing only the cardiac chambers were obtained. The heart-to-mediastinum ratio was significantly lower in the CD36-deficient patients than in the healthy volunteers (1.71 +/- 0.11 versus 2.95 +/- 0.22, P
Yoshizumi, T; Nozaki, S; Fukuchi, K; Yamasaki, K; Fukuchi, T; Maruyama, T; Tomiyama, Y; Yamashita, S; Nishimura, T; Matsuzawa, Y
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