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Massiéra, F, Bloch-Faure, M, Ceiler, D, Murakami, K, Fukamizu, A, Gasc, JM, Quignard-Boulange, A, Negrel, R, Ailhaud, G, Seydoux, J, Meneton, P and Teboul, M (2001) Adipose angiotensinogen is involved in adipose tissue growth and blood pressure regulation. FASEB J. 15:2727-9
White adipose tissue and liver are important angiotensinogen (AGT) production sites. Until now, plasma AGT was considered to be a reflection of hepatic production. Because plasma AGT concentration has been reported to correlate with blood pressure, and to be associated with body mass index, we investigated whether adipose AGT is released locally and into the blood stream. For this purpose, we have generated transgenic mice either in which adipose AGT is overexpressed or in which AGT expression is restricted to adipose tissue. This was achieved by the use of the aP2 adipocyte-specific promoter driving the expression of rat agt cDNA in both wild-type and hypotensive AGT-deficient mice. Our results show that in both genotypes, targeted expression of AGT in adipose tissue increases fat mass. Mice whose AGT expression is restricted to adipose tissue have AGT circulating in the blood stream, are normotensive, and exhibit restored renal function compared with AGT-deficient mice. Moreover, mice that overexpress adipose AGT have increased levels of circulating AGT, compared with wild-type mice, and are hypertensive. These animal models demonstrate that AGT produced by adipose tissue plays a role in both local adipose tissue development and in the endocrine system, which supports a role of adipose AGT in hypertensive obese patients.
Adipocytes/pathology; Adipose Tissue/cytology; Adipose Tissue/growth & development; Angiotensinogen/blood; Angiotensinogen/genetics; Angiotensinogen/physiology; Animals; Blood Pressure/physiology; Drinking; Gene Expression Regulation; Kidney/metabolism; Kidney/pathology; Kidney/physiopathology; Mice; Mice, Knockout; Mice, Transgenic; RNA, Messenger/genetics; RNA, Messenger/metabolism; Renin/genetics; Renin/metabolism; Urination
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