Annals of Nuclear Medicine

, Volume 20, Issue 3, pp 175–181 | Cite as

Detection of maleate-induced Fanconi syndrome by decreasing accumulation of125I-3-iodo-a-methyl-L-tyrosine in the proximal tubule segment-1 region of renal cortex in mice: A trial of separate evaluation of reabsorption

  • Naoto Shikano
  • Takashi Kotani
  • Yusuke Itoh
  • Nobuyoshi Ishikawa
  • Keiichi Kawai
  • Syuichi Nakajima
  • Mitsuyoshi Yoshimoto
  • Ryuichi Nishii
  • Leo Garcia Flores
  • Hideo Saji
Original Article
Received:
Accepted:

Abstract

Objective

Fanconi syndrome is a renal dysfunction characterized by various combinations of renal tubular transport dysfunction involving amino acids, glucose, protein and other substances. Most reabsorption of amino acids occurs in proximal renal tubule segment 1 (S1). The present study evaluated the possibility of early detection of drug-induced Fanconi syndrome, based on decreased renal accumulation of125I-3-iodo-ά-methyl-L-tyrosine (125I-IMT), an amino acid transport marker, in the S1 region of renal cortex. The present experimental model used maleate (MAL)-induced Fanconi syndrome in mice. Results were compared between125I-IMT and 3 other clinical renal radiopharmaceuticals:99mTc-2,3-dimercaptosuccinic acid (99mTc-DMSA);99mTc-mercaptoacetyl-glycylglycylglycine (99mTc-MAG3); and99mTc-diethylenetriaminepentaacetic acid (99mTc-DTPA).

Methods

Male ddY mice (age, 6 weeks; body weight, 25 g) were used to create a Fanconi model of renal dysfunction. A single dose of maleate disodium salt was administered by intraperitoneal injection (6 mmol/kg). Hematoxylin and eosin (HE) staining of the renal cortex, renal autoradiography and measurement of renal radioactivity of labeled compounds were performed at 30, 60, 90 and 120 min after MAL injection. At 5 min after injection of labeled compounds (18.5 kBq for accumulation experiment, 670 kBq for autoradiography), animals were sacrificed by ether overdose and kidneys were removed. For the accumulation experiment, radioactivity was measured using a well-type scintillation counter. For autoradiography, 20-μim sections of frozen kidney were used with Bio-Imaging Analyzer.

Results

At 30 min after MAL injection, HE staining showed pyknosis in some proximal tubule cells. At that time, accumulations of125I-IMT and99mTc-DMSA in the S1 region were approximately 67% and 55% of control levels (p < 0.005). MAL increased accumulation of99mTc-DTPA in the S1 region, but had no effect on accumulation of99mTc-MAG3 in the S1 region.

Conclusions

Decreased accumulation of123I-IMT in the S1 region appears to represent a useful marker for detection of MAL-induced Fanconi syndrome. In future, we plan to assess the efficacy of using125I-IMT to monitor renal dysfunction induced by nephrotoxic clinical drugs.

Key words

reabsorption 3-iodo-ά-methyl-L-tyrosine maleate-induced Fanconi syndrome renal cortex proximal tubule segment 1 
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Copyright information

© Springer 2006

Authors and Affiliations

  • Naoto Shikano
    • 1
  • Takashi Kotani
    • 1
  • Yusuke Itoh
    • 1
  • Nobuyoshi Ishikawa
    • 1
  • Keiichi Kawai
    • 1
  • Syuichi Nakajima
    • 1
    • 2
  • Mitsuyoshi Yoshimoto
    • 2
  • Ryuichi Nishii
    • 3
  • Leo Garcia Flores
    • 4
  • Hideo Saji
    • 5
  1. 1.Department of Radiological SciencesIbaraki Prefectural University of Health SciencesAmi-machi, Inashiki-gun, IbarakiJapan
  2. 2.School of Health SciencesFaculty of Medicine, Kanazawa UniversityJapan
  3. 3.Department of Experimental Diagnostic ImagingUniversity of Texas, MD Anderson Cancer CenterJapan
  4. 4.Department of Medical PhysicsUniversity of Wisconsin Medical SchoolJapan
  5. 5.Graduate School of Pharmaceutical SciencesKyoto UniversityJapan

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