Ultrastructure of the nephron in the soft-shelled turtle, Pelodiscus sinensis (Reptilia, Chelonia, Trionychidae)

Xu, Chunsheng; Yang, Ping; Bao, Hongyan; Xin-min, Bian; Chen, Qiusheng

doi:10.1016/j.micron.2012.10.001

Cited by 3 publications

(4 citation statements)

References 30 publications

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“…The proximal tubule morphological characteristics in P. expansa are the same as other vertebrates, composed of elongated cells with a brush border, many mitochondria, and light and dark vesicles (Meseguer et al, 1987;Møbjerg et al 1998;Xu et al, 2013). The proximal tubule connects the urinary pole through a short segment that appears during the early stages of mesonephric tubules, composed of low cuboidal or flat ciliated cells, characteristic of the amphibian mesonephros (Meseguer et al, 1987;Meseguer et al, 1996;Taugner et al, 1982), but barely developed or absent in reptiles (Gabri, 1983;Meseguer et al, 1987;Solomon, 1985).…”

Section: Discussionmentioning

confidence: 89%

“…Studies on the mesonephros development in chelonians are scarce, with most investigations concerning the metanephros (Meseguer et al, 1987; Solomon, 1985; Xu et al, 2013). However, many features found in the adult kidneys of some turtles (Meseguer et al, 1987; Solomon, 1985) are present during mesonephros morphogenesis in P. expansa , such as the presence of the renal corpuscles, consisting of the parietal and visceral layers, neck segments, proximal tubules, distal tubules, intermediated segment, collecting tubules, and collecting duct.…”

Section: Discussionmentioning

confidence: 99%

“…The proximal tubule connects the urinary pole through a short segment that appears during the early stages of mesonephric tubules, composed of low cuboidal or flat ciliated cells, characteristic of the amphibian mesonephros (Meseguer et al, 1987; Meseguer et al, 1996; Taugner et al, 1982), but barely developed or absent in reptiles (Gabri, 1983; Meseguer et al, 1987; Solomon, 1985). However, their presence has been described for the metanephros in some turtle species (Meseguer et al, 1987; Xu et al, 2013). In P. expansa , this short segment was observed in the mesonephros, although the presence in some renal corpuscles was only confirmed by connecting the parietal layer to the proximal tubule, whereas in other embryos, the renal corpuscles was attached directly to the proximal tubule.…”

Section: Discussionmentioning

confidence: 99%

“…Studies describing adult turtle kidney anatomy are available (Meseguer et al, 1987; Solomon, 1985; Xu et al, 2013). However, few describe the embryonic development of pronephros and mesonephros.…”

Section: Introductionmentioning

confidence: 99%

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Pronephros and mesonephros characterization during the embryonic development of the giant South American river turtle, Podocnemis expansa (Podocnemididae: Testudines)

Magalhães

Dias

Oliveira

et al. 2022

The Anatomical Record

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This study aimed to describe pronephros and mesonephros morphology during the embryonic development of Podocnemis expansa. Eggs were collected on an artificial beach at Balbina, Amazonas, Brazil, during the entire incubation period (mean of 59 days). The kidney-gonad complex was processed using light microscopy and the mesonephros using transmission electron microscopy. The pronephros was present for the first time on stage 4, composed of external glomeruli devoid of a capsule, protruding into the coelomic cavity, and internally composed of a capillary network. The pronephros degenerated after development stage 15. The first sign of the appearance of the mesonephros occurred around stage 8, indicated by the early formation of renal corpuscles. The mesonephros comprised an renal corpuscles, neck segment, proximal tubule, intermediate segment, distal tubule, collector tubule, and collector duct. Ultrastructural analysis of the mesonephros brush border was done in the proximal tubule, and the presence of cells with structural characters indicative of secretory activity was detected in the juxtatubular region. Renal corpuscles and proximal tubules were the main components that underwent morphological alterations during mesonephros degeneration. The pronephros is a transient kidney, and the mesonephros became the functional embryonic kidney in P. expansa. Mesonephros degeneration occurs in the cranial-caudal direction, and histologically, the degeneration is identified by changes in the morphology of the renal corpuscle and proximal tubule. However, the mesonephros is still present after hatching.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pronephros and mesonephros characterization during the embryonic development of the giant South American river turtle, Podocnemis expansa (Podocnemididae: Testudines)

Magalhães

Dias

Oliveira

et al. 2022

The Anatomical Record

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Structure and Properties of the Glomerular Filtration Barrier in Vertebrates: Role of a Charge in Protein Filtration

Balbotkina,

Kutina

2023

J Evol Biochem Phys

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Structure and Properties of the Glomerular Filtration Barrier of Vertebrates: Role of Charge for Filtering Proteins

Balbotkina,

Kutina

2023

Žurnal èvolûcionnoj biohimii i fiziologii

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The renal glomerulus is a unique structure that distinguishes the nephrons of vertebrates from the nephridia of invertebrate animals, providing a direct connection between the circulatory and excretory systems and the most effective control of the composition of the internal environment due to the significant intensification of filtration. The modern ideas about the structure of the glomerular filtration barrier in representatives of all major groups of vertebrates (cyclostomes, fishes, amphibians, reptiles and birds, mammals) were reviewed. Emphasis is placed on the role of the charge of the glomerular barrier structures for its selective properties; approaches to studying the contribution of the anionic components of the renal filter to preventing the loss of plasma proteins are described. The main models of the glomerular filter functioning presented in the literature are considered. Negative charge has been demonstrated to be a distinctive feature of the glomerular filter in all vertebrates. It was shown that a multiple increase of the glomerular filtration rate (from lower vertebrates to birds and mammals) was accompanied by a number of structural changes that ensured the passage of a significant volume of water and dissolved low-molecular substances through the glomerular filter: an increase in the number and ordering of fenestrae in the endothelium of glomerular capillaries, thinning of the glomerular basement membrane and complete exclusion of cellular elements from it. It has been shown that comparative physiological data on the glomerular filter in different groups of vertebrates most strongly confirm the electrokinetic model of the glomerular filtration, since it explains the importance of the evolutionarily conservative structure of podocytes and the role of a set of fixed anionic charges in the filter wall to prevent the loss of macromolecules (primarily proteins) from blood at different intensities of the ultrafiltration.

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Ultrastructure of the nephron in the soft-shelled turtle, Pelodiscus sinensis (Reptilia, Chelonia, Trionychidae)

Cited by 3 publications

References 30 publications

Pronephros and mesonephros characterization during the embryonic development of the giant South American river turtle, Podocnemis expansa (Podocnemididae: Testudines)

Pronephros and mesonephros characterization during the embryonic development of the giant South American river turtle, Podocnemis expansa (Podocnemididae: Testudines)

Structure and Properties of the Glomerular Filtration Barrier in Vertebrates: Role of a Charge in Protein Filtration

Structure and Properties of the Glomerular Filtration Barrier of Vertebrates: Role of Charge for Filtering Proteins

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