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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Interaction between TGF-β and ACE2-Ang-(1-7)-Mas pathway in high glucose-cultured NRK-52E cells.
Molecular and Cellular Endocrinology 2013 Februrary 6
Transforming growth factor-β (TGF-β) is pivotal in diabetic nephropathy (DN). Angiotensin converting enzyme-2 (ACE2) converts angiotensin II (Ang II) to angiotensin 1-7 (Ang-(1-7)), which binds to Mas. Proximal tubular ACE2 is decreased in DN. ACE2 deficiency exacerbates whereas ACE2 overexpression attenuates DN. Thus, we investigated the mechanism of high glucose-decreased ACE2 in terms of the interaction between TGF-β and ACE2-Ang-(1-7)-Mas in NRK-52E cells. We found that high glucose increased TGF-β1. SB431542 attenuated high glucose-inhibited ACE2 and Mas and Ang-(1-7) conversion from Ang II while attenuating high glucose-induced fibronectin. TGF-β1 also decreased ACE2 and Mas and Ang-(1-7) conversion from Ang II. A779 attenuated Ang-(1-7)-decreased TGF-β1 and Ang-(1-7)-activated JAK2-STAT3. Moreover, A779, LY294002 and AG490 attenuated Ang-(1-7)-inhibited TGF-β1. The combination of Ang-(1-7) and Mas attenuated TGF-β1 (but not high glucose)-induced fibronectin. Thus, high glucose decreases ACE2 via TGF-βR in NRK-52E cells. Additionally, there is a negative feedback function between TGF-β and ACE2, and the combined inhibition of TGF-β and activation of the ACE2-Ang-(1-7)-Mas may be useful for treating diabetic renal fibrosis.
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