Vascular endothelial growth factor is increased during early stage of diabetic nephropathy in type II diabetic rats

Dae Ryong Cha, Young Sun Kang, Sang Youb Han, Yi Hwa Jee, Kum Hyun Han, Jee Young Han, Young Sik Kim, Nan Hee Kim

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    62 Citations (Scopus)

    Abstract

    Vascular endothelial growth factor (VEGF) has been implicated in the pathogenesis of diabetic nephropathy. We investigated serial changes of VEGF in the kidney and assessed whether glomerular and urinary VEGF levels are related to the severity of diabetic nephropathy. Furthermore, we examined the relationship between urinary VEGF levels and the urinary albumin excretion (UAE) rate in Otsuka-Long-Evans-Tokushima-Fatty (OLETF) rats. Glomerular VEGF mRNA expression and protein synthesis were evaluated by the reverse transcription-polymerase chain reaction, immunohistochemical staining and in situ hybridization. Urinary levels of VEGF were determined by enzyme-linked immunosorbent assay. UAE was significantly higher in OLETF rats than in control Long-Evans-Tokushima-Fatty (LETO) rats throughout the study period. Urinary VEGF levels were significantly higher from 25 to 37 weeks, and then gradually reduced until 55 weeks, although the levels were still higher than those in control rats. Urinary VEGF levels also showed a significant positive correlation with UAE (r=0.262, P=0.045) and serum creatinine (r=0.398, P=0.044), and were found to be independently correlated with UAE by Spearman's rank correlation. By immunohistochemical staining and in situ hybridization, VEGF was mainly detected in the podocytes in the glomeruli. Interestingly, a significant increase in VEGF mRNA expression was observed in the early period of diabetic nephropathy, and this was associated with increased urinary VEGF excretion. Thus, the overproduction of VEGF in the diabetic kidney may participate in the pathogenesis of early-stage diabetic nephropathy.

    Original languageEnglish
    Pages (from-to)183-194
    Number of pages12
    JournalJournal of Endocrinology
    Volume183
    Issue number1
    DOIs
    Publication statusPublished - 2004 Oct

    ASJC Scopus subject areas

    • Endocrinology, Diabetes and Metabolism
    • Endocrinology

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