Structure of the kidney of Bufo arenarum: intermediate segment, distal tubule and collecting tubule.
Biocell
; 27(1): 19-28, 2003 Apr.
Article
em En
| MEDLINE
| ID: mdl-12847911
The ultrastructure of the intermediate segment (IS), distal tubule and collecting tubule (CT) of the south american toad Bufo arenarum, was studied by light and transmission electron microscopy. The IS is composed of cubical ciliated cells which propel the urine along the renal tubule. The distal tubule is divided into two portions: the early distal tubule (EDT) and the late distal tubule (LDT). The EDT is characterized by only one type of cells with well developed basolateral interdigitations and numerous elongated mitochondria, which are oriented normal to the basal surface. The "macula densa--like" is a specialized zone of the EDT in contact with the vascular pole, where cells are more tightly packed than in the rest of the tubule. The LDT shows two types of cells called dark and light cells according to the appearance of their cytoplasm. Dark cells have microplicae and few but long microvilli at their luminal surface, and abundant mitochondria in their cytoplasm. Light cells show basal and lateral infoldings and few mitochondria. The CT, which is composed of dark and light cells, exhibits an enlarged lumen with an undulated surface and dilated spaces between neighbouring cells. This work is a contribution to the knowledge of the kidney of B. arenarum; frequently used as an experimental model for physiological and biochemical studies.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Bufo arenarum
/
Rim
/
Túbulos Renais
/
Túbulos Renais Coletores
/
Túbulos Renais Distais
Limite:
Animals
Idioma:
En
Revista:
Biocell
Assunto da revista:
BIOLOGIA MOLECULAR
/
DIAGNOSTICO POR IMAGEM
/
HISTOCITOQUIMICA
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Argentina
País de publicação:
Estados Unidos