Ultrastructure of the renal juxtaglomerular complex and peripolar cells in the axolotl (Ambystoma mexicanum) and toad (Bufo marinus).

AUTOR(ES)

Hanner, R H

RESUMO

Renal juxtaglomerular regions were examined in the axolotl (Ambystoma mexicanum and toad (Bufo marinus). Prominent granulated peripolar epithelial cells were found surrounding the origin of the glomerular tuft in the axolotl. These cells resembled the peripolar cells recently discovered in mammalian species. They contained multiple electron-dense cytoplasmic granules, some of which showed a paracrystalline substructure and signs of exocytoxic activity. Such cells were difficult to find and smaller in the toad. In contrast, granulated juxtaglomerular arteriolar myoephithelial cells were much more readily found and larger in the toad than in the axolotl. No consistent differences were noted in juxtaglomerular cells or their granules in response to changes in environmental chloride concentration.

Documentos Relacionados

• POLYPLOIDY IN THE MEXICAN AXOLOTL (AMBYSTOMA MEXICANUM) RESULTING FROM MULTINUCLEATE OVA*
• Mercury blockage of apical water channels in toad skin (Bufo marinus).
• Synaptic transfer of rod signals to horizontal and bipolar cells in the retina of the toad (Bufo marinus).
• Neurotransmitter-induced currents in retinal bipolar cells of the axolotl, Ambystoma mexicanum.
• Lateral diffusion of visual pigments in toad (Bufo marinus) rods and in catfish (Ictalurus punctatus) cones.