Lowering blood pressure blocks mesangiolysis and mesangial nodules, but not tubulointerstitial injury, In Diabetic eNOS knockout mice

Tomoki Kosugi, Marcelo Heinig, Takahiro Nakayama, Thomas Connor, Yukio Yuzawa, Qiuhong Li, William W. Hauswirth, Maria B. Grant, Byron P. Croker, Martha Campbell-Thompson, Li Zhang, Mark A. Atkinson, Mark S. Segal, Takahiko Nakagawa

研究成果: Article査読

42 被引用数 (Scopus)

抄録

Recently, we and others reported that diabetic endothelial nitric oxide synthase knockout (eNOSKO) mice develop advanced glomerular lesions that include mesangiolysis and nodular lesions. Interestingly, insulin treatment lowered blood pressure and prevented renal lesions, raising the question as to whether these beneficial effects of insulin were due to its ability to lower either high glucose levels or high blood pressure. We, therefore, examined the effect of lowering blood pressure using hydralazine in this diabetic eNOSKO mouse model. Hydralazine treatment significantly blocked the development of me- sangiolysis and microaneurysms, whereas tubulointerstitial injury was not prevented in these mice. Additionally, hydralazine did not reduce expression levels of either tubulointerstitial thrombospondin-1 or transforming growth factor-β despite controlling blood pressure. On the other hand, the critical role of high glucose levels on the development of tubuloin- terstitial injury was suggested by the observation that serum glucose levels were correlated with tubuloin- terstitial injury, as well as with the expression levels of both transforming growth factor-β and throm bospondin-1. Importantly, controlling blood glucose with insulin completely blocked tubulointerstitial injury in diabetic eNOSKO mice. These data suggest that glomerular injury is dependent on systemic blood pressure, whereas hyperglycemia may have a more important role in tubulointerstitial injury, possibly due to the stimulation of the thrombospondin-1-transforming growth factor-β pathway in diabetic eNOSKO mice. This study could provide insights into the pathogenesis of advanced diabetic nephropathy in the presence of endothelial dysfunction.

本文言語English
ページ(範囲)1221-1229
ページ数9
ジャーナルAmerican Journal of Pathology
174
4
DOI
出版ステータスPublished - 04-2009
外部発表はい

All Science Journal Classification (ASJC) codes

  • 病理学および法医学

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