The structure of the nephron in the south american lungfish, lepidosiren paradoxa

Guyton, Jack S.

doi:10.1002/ar.1090630302

Cited by 18 publications

(8 citation statements)

References 5 publications

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“…For the rest of the course, the PT looks like a fish hook, with two straight parts joined by an arcuate portion. Also, we have not found the diverticula described in other Protopterus species (Cordier,1937), or the numerous loops described in L. paradoxa (Guyton,1935). Some of these discrepancies may be species‐specific.…”

Section: Discussioncontrasting

confidence: 66%

“…The IS is well defined in archaic freshwater fish (Henstchel and Elger,1989), in Amphibia (Clothier et al,1978; Taugner et al,1982; Sakai et al,1986; Møbjerg et al,2004), and in Reptilia (Davis et al,1976; Peek and McMillan,1979). In the lungfish, the presence of the IS has been reported in L. paradoxa (Guyton,1935) and in P. annectens (Sawyer et al,1982), but appears to be absent in N. forsteri (Jespersen,1969). In P. dolloi , the IS was previously termed the “segment grêle” (Cordier,1929), but it was not recognized in a later study (Hentschel and Elger,1987).…”

Section: Discussionmentioning

confidence: 96%

“…The OD of the tubular segments of the P. dolloi nephron is in the diameter range reported in several fish (Youson and McMillan,1970; Lacy and Reale,1985) and amphibian (Sakai and Kawahara,1983; Møbjerg et al,2004) species. In Dipnoi, differences in the OD of the tubular segments of the nephron have been reported in L. paradoxa (Guyton,1935) and in P. dolloi (Hentschel and Elger,1987). However, some previous observations do not agree with the present results.…”

Section: Discussionmentioning

confidence: 99%

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Microanatomy and ultrastructure of the kidney of the African lungfish Protopterus dolloi

et al. 2006

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The Dipnoi (lungfishes) have developed true lungs, having the ability to take oxygen from both the gills and the lungs. During the tropical dry season, many lungfish estivate on land, breathing only air. The estivation period is accompanied by profound functional modifications, including the suppression of urine. Thus, the lungfish kidney must be designed to cope with these dramatic cyclic changes in renal function. We study here the microanatomy and the structure of the kidney of the African lungfish Protopterus dolloi, maintained under controlled freshwater conditions. Chemical microdissection, light microscopy, and scanning and transmission electron microscopy have been used. The nephrons of P. dolloi are composed of a renal corpuscle (RC) and of a renal tubule that appears divided into five morphologically distinct segments: neck segment (NS), proximal tubule (PT), intermediate segment (IS), distal tubule (DT), and collecting tubule (CT). Paired CTs abut into a collecting duct, the latter emptying into an archinephric duct. The RCs lie in the mid-zone of the kidney, between the PTs and the convoluted DTs. The spatial distribution of these elements allows recognition of a kidney zonation. The RCs group into clusters (3-4 RCs per cluster) that are supplied by a single arteriole surrounded by pericytes. Each cluster appears to represent a functional unit with a common hemodynamic regulatory mechanism. The major processes of the podocytes form flattened networks that appear to constitute an integrated system due to the presence of gap junctions. The existence of mesangial cells with large cell processes, and of mesangial cells with a dendritic appearance, suggests a complex functional role (contractile and phagocytic) for the mesangium. The NS and the IS are the narrowest nephron segments, formed only by multiciliated cells. The PT and the DT can be subdivided, based on the tubular morphology and on cell composition, into portions I and II: PTI is formed only by brush border (BB) cells, while PTII contains BB and multiciliated cells. The DTI is formed by segment-specific cells, while the DTII contains segment-specific and a small number of flask cells. The CT contains principal and flask cells in a 5:1 ratio. The flask cells adopt two different configurations (with a narrow canaliculus or with a large cavity). The main goal of this study was to disclose specific kidney features that could be related to function, phylogeny, and habitat. In addition, the present results constitute the basis for a study of the morphologic changes that should occur in the kidney of P. dolloi during estivation. Anat Rec Part A, 288A: 609 -625, 2006.

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Section: Discussioncontrasting

confidence: 66%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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Microanatomy and ultrastructure of the kidney of the African lungfish Protopterus dolloi

et al. 2006

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“…The non‐ciliated intermediate segment in this juvenile specimen resembles that of the adult L. chalumnae nephron (Millot & Anthony, 1973 a ) but differs from the ciliated intermediate segment reported in archaic bonyfish Polypterus (Hentschel & Elger, 1989), dipnoi (Guyton, 1935; Ojeda, et al , 2006) and amphibia (Mobjerg et al, 1998, 2004). Since the neck segment is also devoid of cilia, it appears that the entire nephron epithelium in L. chalumnae is devoid of cilia, as is the case in birds and mammals (Hentschel & Elger, 1989).…”

Section: Discussionmentioning

confidence: 49%

“…Several investigators have given measurements of the size of renal corpuscle in different fishes living in different environments. The cyclostomes possess the largest renal corpuscles (glomi) measuring 90–876 µm in length and 175–500 µm in diameter, followed by elasmobranchs (95–350 µm diameter), dipnoans (180 µm), freshwater teleosts (84–115 µm) and the marine teleosts, which have the smallest (48–100 µm) renal corpuscles (Marshall, 1934; Guyton, 1935; Grafflin, 1937; Hickman & Trump, 1969; Youson & McMillan, 1970 a ; Andrew & Hickman, 1974; Anderson & Loewen, 1975; Nishimura et al ,, 1983; Lacy & Reale, 1985 a ). In the crab‐eating frog Rana cancrivora , which lives in a high‐salinity environment, the renal corpuscles are 100–180 µm in diameter (Uchiyama et al , 1990).…”

Section: Discussionmentioning

confidence: 99%

Structure of the kidney in the coelacanth Latimeria chalumnae with reference to osmoregulation

Jarial

Wilkins

2010

Journal of Fish Biology

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The morphology of the nephrons of the coelacanth Latimeria chalumnae was investigated by light microscopy. Each nephron is composed of a large renal corpuscle with well-vascularized glomerulus, non-ciliated neck segment, proximal convoluted tubule divided into distinct first and second segments, non-ciliated intermediate segment, distal tubule, collecting tubule and collecting duct. The parietal layer of the Bowman's capsule of the renal corpuscle is composed of low cuboidal cells. The short non-ciliated neck segment is lined by cuboidal epithelium. The first and second proximal segments display a prominent brush border and contain amorphous material in their lumen. The second proximal segment differs from the first segment in having taller columnar epithelium and a relatively narrow lumen. The intermediate segment is lined by non-ciliated columnar epithelium and its lumen appears empty. The distal tubule is narrow in diameter and its cuboidal epithelium is devoid of intercalated cells. A unique feature of L. chalumnae is having binucleate cells in the tubule and collecting duct epithelium. The renal arteries have poorly developed tunica media and its cells contain granular material. The structure of L. chalumnae nephrons correlates well with their osmoregulatory function and resembles those of euryhaline teleosts.

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Observations upon the structure of the nephron in the common eel

Grafflin

1937

Am. J. Anat.

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The structure of the nephron in the south american lungfish, lepidosiren paradoxa

Cited by 18 publications

References 5 publications

Microanatomy and ultrastructure of the kidney of the African lungfish Protopterus dolloi

Microanatomy and ultrastructure of the kidney of the African lungfish Protopterus dolloi

Structure of the kidney in the coelacanth Latimeria chalumnae with reference to osmoregulation

Observations upon the structure of the nephron in the common eel

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