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Jens Randel Nyengaard

Heterogeneous downregulation of angiotensin II AT1-A and AT1-B receptors in arterioles in STZ-induced diabetic rat kidneys

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  • Zsolt Razga, Department of Pathology, University of Szeged, Hungary., Denmark
  • Gabor Kovacs, Department of Pediatrics, University of Szeged, Állomás Utca 2, Szeged 6725, Hungary.
  • ,
  • Nikolett Bódi, Department of Physiology, Anatomy and Neuroscience, University of Szeged, Hungary., Unknown
  • Petra Talapka, Department of Physiology, Anatomy and Neuroscience, University of Szeged, Hungary., Unknown
  • Jens Randel Nyengaard

INTRODUCTION: The renin granulation of kidney arterioles is enhanced in diabetes despite the fact that the level of angiotensin II in the diabetic kidney is elevated. Therefore, the number of angiotensin II AT1-A and AT1-B receptors in afferent and efferent arteriole's renin-positive and renin-negative smooth muscle cells (SMC) was estimated.

METHOD: Immunohistochemistry at the electron microscopic level was combined with 3D stereological sampling techniques.

RESULTS: In diabetes the enhanced downregulation of AT1-B receptors in the renin-positive than in the renin-negative SMCs in both arterioles was resulted: the significant difference in the number of AT1 (AT1-A + AT1-B) receptors between the two types of SMCs in the normal rats was further increased in diabetes and in contrast with the significant difference observed between the afferent and efferent arterioles in the normal animals, there was no such difference in diabetes.

CONCLUSIONS: The enhanced downregulation of the AT1-B receptors in the renin-negative SMCs in the efferent arterioles demonstrates that the regulation of the glomerular filtration rate by the pre- and postglomerular arterioles is changed in diabetes. The enhanced downregulation of the AT1-B receptors in the renin-positive SMCs in the arterioles may result in an enhanced level of renin granulation in the arterioles.

Original languageEnglish
Article number947506
JournalBioMed Research International
Volume2014
Number of pages6
ISSN2314-6133
DOIs
Publication statusPublished - 2014

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