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Br J Ophthalmol 2005;89:871-873 doi:10.1136/bjo.2004.056580
  • Clinical science
    • Extended reports

Serum prorenin levels and diabetic retinopathy in type 2 diabetes: new method to measure serum level of prorenin using antibody activating direct kinetic assay

  1. H Yokota1,
  2. F Mori1,
  3. K Kai1,
  4. T Nagaoka1,
  5. N Izumi1,
  6. A Takahashi1,
  7. T Hikichi1,
  8. A Yoshida1,
  9. F Suzuki2,
  10. Y Ishida3
  1. 1Department of Ophthalmology, Asahikawa Medical College, Asahikawa, Japan
  2. 2Faculty of Applied Biological Science, Gifu University, Gifu, Japan
  3. 3Preveqol Co, Tokyo, Japan
  1. Correspondence to: Harumasa Yokota MD, Department of Ophthalmology, Asahikawa Medical College, 2-1-1-1 Midorigaoka Higashi, Asahikawa, 078-8510 Japan; atokoy18asahikawa-med.ac.jp
  • Accepted 1 December 2004

Abstract

Aim: To investigate the serum levels of prorenin and its correlation with the severity of diabetic retinopathy (DR).

Methods: 248 patients with diabetes and 108 control subjects were divided into four groups: no-DR (n = 146), no proliferative diabetic retinopathy (no-PDR) (n = 78), PDR (n = 24), and controls (n = 108). Serum levels of prorenin from all subjects were measured using the new antibody activating direct kinetic (AAD-PR) assay. The serum prorenin levels were compared among the groups.

Results: The serum levels of prorenin in the control, no-DR, no-PDR, and PDR groups, respectively, were 109.1 (66.1), 194.6 (160.4), 271.5 (220.3), and 428.4 (358.4) pg/ml (mean (SD)). Prorenin in the PDR group was remarkably high compared with the control and no-DR groups (p<0.0001) and with the no-PDR group (p = 0.002). Serum levels of prorenin increased with increasingly severe retinopathy. No correlation was found between the prorenin level and the duration of disease or HbA1c.

Conclusions: The serum levels of prorenin in patients with PDR were found to be markedly high using the AAD-PR assay. Increased levels of prorenin in diabetes may have an important role in the pathogenesis of DR.

Footnotes

  • The authors have no proprietary interest in any aspect of this report.

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