Electron microscopic evaluation of the secretory mechanisms of Renin from Juxtaglomerular cells

Küçük Resim Yok

Tarih

2010

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Revista Chilena de Anatomía

Erişim Hakkı

CC0 1.0 Universal
info:eu-repo/semantics/openAccess

Araştırma projeleri

Organizasyon Birimleri

Dergi sayısı

Özet

Although the structure and the functions of juxtaglomerular cells (JG) have been well defined, there is still a controversy about the secretory mechanisms of renin from these cells. It has been assumed that exocytosis is the main secretory mechanism in these cells in many studies, while others suggest that secretion occurs in a quite different way in these cells. There are several studies suggesting that diacrine secretion, which is very difficult to visualize, might be the other mechanism for secretion of renin. This study is an attempt to find the answers of these questions by identifying the fine structural features of the secretory granules in juxtaglomerular cells. Cyclosporin A (CyA) has been used in the current experimental study since it has already been reported that this drug increases the number of JG cells and stimulates secretion of Renin. Twelve female Sprague-Dawley rats had daily intraperitoneal injections of CyA for ten weeks. Tissue specimens from the kidneys of these animals were examined by electron microscopy. Fine structural characteristics of the secretory granules of juxtaglomerular cells have been examined. Considerable amount of granules, which goes to the exocytotic process, have been observed. Additionally, several cells, which their granules had been secreting their contents in a different way, were found. This was interpreted as the secretion type of diacrine secretion. In conclusion, this in vivo study presents morphologic evidences demonstrating that both exocytosis and diacrine secretion might occur in JG cells. We also had a chance to observe secretory granule probably exhibiting “diacrine secretion”, which is very difficult to visualize, at electron microscope level for the first time. This report also provides morphologic proof which shows that these two distinct secretory mechanisms might occur simultaneously in the same juxtaglomerular cell.

Açıklama

Anahtar Kelimeler

Juxtaglomerular cells, Secretory granules, Microscopy

Kaynak

International Journal of Morphology

WoS Q Değeri

Scopus Q Değeri

Q3

Cilt

28

Sayı

3

Künye

Aktaş, R. G., Karabay, G., Taşkınalp, O. ve Kutlu, A. K. (2010). Electron microscopic evaluation of the secretory mechanisms of Renin from Juxtaglomerular cells / Evaluación con Microscopía Electrónica de los Mecanismos Secretorios de Renina desde las Células Juxtaglomerulares. International Journal of Morphology, Revista Chilena de Anatomía. 28(3), s. 723-728.