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Horm Metab Res 2013; 45(05): 338-343
DOI: 10.1055/s-0032-1331256
Original Basic
© Georg Thieme Verlag KG Stuttgart · New York

Aberrant Activation of the Intrarenal Renin-Angiotensin System in the Developing Kidneys of Type 2 Diabetic Rats

Y.-Y. Fan
1   Department of Traditional Chinese Medicine, Beijing Tongren Hospital, Capital Medical University, Beijing, P. R. China
2   Department of Pharmacology, Kagawa University Medical School, Kagawa, Japan
,
H. Kobori
2   Department of Pharmacology, Kagawa University Medical School, Kagawa, Japan
,
D. Nakano
2   Department of Pharmacology, Kagawa University Medical School, Kagawa, Japan
,
H. Hitomi
2   Department of Pharmacology, Kagawa University Medical School, Kagawa, Japan
,
H. Mori
3   Gastroenterology, Kagawa University Medical School, Kagawa, Japan
,
T. Masaki
3   Gastroenterology, Kagawa University Medical School, Kagawa, Japan
,
Y.-X. Sun
4   Department of Rehabilitation, The First Hospital of Chinese Medicine University, Shenyang, P. R. China
,
N. Zhi
1   Department of Traditional Chinese Medicine, Beijing Tongren Hospital, Capital Medical University, Beijing, P. R. China
,
L. Zhang
5   Otolaryngology, Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, P. R. China
,
W. Huang
6   Nephrology, Beijing Tongren Hospital, Capital Medical University, Beijing, P. R. China
,
B. Zhu
7   Department of Institute of Clinical Medical Science, China-Japan Friendship Hospital, Beijing, P. R. China
,
P. Li
7   Department of Institute of Clinical Medical Science, China-Japan Friendship Hospital, Beijing, P. R. China
,
A. Nishiyama
2   Department of Pharmacology, Kagawa University Medical School, Kagawa, Japan
› Author Affiliations
Further Information

Publication History

received 22 April 2012

accepted after second revision 14 November 2012

Publication Date:
15 January 2013 (online)

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Abstract

We have previously reported that intrarenal angiotensin II (Ang II) levels are increased long before diabetes becomes apparent in obese Otsuka-Long-Evans-Tokushima-Fatty (OLETF) rats, a model of type 2 diabetes. In this study, we examined the changes in intrarenal renin-angiotensin system (RAS) activity in the developing kidneys of OLETF rats. Ang II contents and mRNA levels of RAS components were measured in male OLETF and control Long-Evans Tokushima (LETO) rats at postnatal days (PND) 1, 5, and 15, and at 4–30 weeks of age. In both LETO and OLETF rats, kidney Ang II levels peaked at PND 1, then decreased during the pre- and post-weaning periods. However, Ang II levels and gene expression of RAS components, including angiotensinogen (AGT), renin, and angiotensin-converting enzyme (ACE), were not significantly different between LETO and OLETF rats. Intrarenal Ang IIcontents further decreased during puberty (from 7 to 11 weeks of age) in LETO rats, bur not in OLETF rats. At 11 weeks of age, kidney Ang II levels, urinary AGT excretion, and mRNA levels of AGT and renin were higher in OLETF rats than in LETO rats, while blood glucose levels were not significantly different between these groups of rats. These data indicate that continued intrarenal expression of Ang II during pubescence contributes to the increases in intrarenal Ang II levels in prediabetic OLETF rats, and is associated with increased intrarenal AGT and renin expression. Inappropriate activation of the intrarenal RAS in the prediabetic stage may facilitate the onset and development of diabetic nephropathy in later life.

Key words

angiotensin II - developing kidney - diabetes - angiotensinogen
 

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