Cell and Tissue Research

, Volume 274, Issue 3, pp 597–604

Scanning and transmission electron-microscopic study of peripolar cells in the newborn lamb kidney

  • Cassandra M. Thumwood
  • Jane McCausland
  • Daine Alcorn
  • Graeme B. Ryan
Article

DOI: 10.1007/BF00314558

Cite this article as:
Thumwood, C.M., McCausland, J., Alcorn, D. et al. Cell Tissue Res (1993) 274: 597. doi:10.1007/BF00314558

Abstract

Scanning and transmission electron microscopy were used to study the ultrastructural characteristics and positions of granulated peripolar cells in newborn lamb kidney. Following tissue fixation by vascular perfusion in situ, the vascular pole region of the glomerulus was exposed for examination by scanning electron micoscopy following removal of the glomerular tuft. Peripolar cells were recognized by their surface morphology enabling their quantification and an assessment of the relationship of their position in the renal cortex. The prominent expression of peripolar cells in this species was confirmed. Almost every vascular pole examined revealed peripolar cells (405 out of 407; 99.5%) and thus, throughout the cortex, the distribution of peripolar cells was the same as the distribution of renal corpuscles. Larger, more protruding peripolar cells were observed in the outer cortical renal corpuscles. The numbers of peripolar cells encircling each vascular pole ranged from 1 to 10. There was no correlation between number of granulated peripolar cells at the vascular pole and the position of the renal corpuscle within the renal cortex. As viewed by transmission electron microscopy, organelles of protein synthesis were abundant in the cytoplasm of peripolar cells. Exocytosis of cytoplasmic granules was observed by both scanning and transmission electron microscopy implying that a process of regulative secretion occurs from these cells. The use of ultrastrural techniques has provided evidence supporting the concept that peripolar cells are prominent in the cuff region of each renal corpuscle of the newborn lamb and further-more that peripolar cells in this species most likely have a secretory function.

Key words

Peripolar cells Juxtaglomerular apparatus Cytoplasmic granules Exocytosis Electron microscopy Sheep, newborn 

Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Cassandra M. Thumwood
    • 1
    • 2
  • Jane McCausland
    • 1
    • 2
  • Daine Alcorn
    • 1
    • 2
  • Graeme B. Ryan
    • 1
    • 2
  1. 1.Department of Anatomy and Cell BiologyUniversity of MelbourneParkvilleAustralia
  2. 2.Ludwig Institute of Cancer ResearchParkvilleAustralia

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