The Ultrastructure of Secretory Cells of the Islets of Langerhans in South American Catfish <i>Rhamdia quelen</i>

Luchini, Laura; Wicki, G.; Romano, Luís Alberto

doi:10.1155/2015/686571

Cited by 8 publications

(7 citation statements)

References 12 publications

(12 reference statements)

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“…Similar findings were reported in the compact pancreas (Sheibani & Pahlavan Yali, 2006; Naguib et al., 2009; Mokhtar, 2015). The endocrine portion appeared as pale staining islets distributed among the exocrine tissue, similar to that recorded in other previous reports (Chakrabarti & Ghosh, 2015; Luchini et al., 2015). Endocrine tissue consisted of large principal islet and numerous smaller islets, as in most previous studies (Stefan & Falkmer, 1980; Groff & Youson, 1997).…”

Section: Discussionsupporting

confidence: 90%

“…In fish, it has been reported that the alimentary pattern could affect hormonal secretion (Navarro et al., 2002). Furthermore, two forms of the pancreas (compact and disseminated) were reported in various fish species (Chen et al., 2006; Youson et al., 2006; Tocher et al., 2008; Luchini et al., 2015; Mokhtar, 2015); however, reports explaining the localization and morphology of disseminated portion in catfish remain scarce.…”

Section: Discussionmentioning

confidence: 99%

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Unique localization of disseminated pancreas in the oesophagus of catfish (clarias gariepinus) with reference to sexual dimorphism

Karkit

Salem

Bareedy

et al. 2021

Anat Histol Embryol

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Background:The fish pancreas has been reported to be composed of two portions: compact and disseminated. However, little has been elucidated in catfish. The present study describes a unique localization of the disseminated pancreas in African catfish. Methods:The sections were obtained and used for either routine histological examination following staining with haematoxylin and eosin (H & E), periodic acid-Schiff's, or were subjected to immunohistochemical staining for detection of both insulinproducing β cells and glucagon-producing alpha cells.Results: Our investigation showed that the pancreas of catfish consisted of both compact and disseminated portions. The compact pancreas was embedded in the mesenteric adipose tissue between the spleen, stomach and liver. However, the disseminated one showed unique localization in the tunica adventitia of the middle portion of the oesophagus. The pancreas consisted of two portions, exocrine and endocrine. Furthermore, in both types of pancreas, the female showed a significantly higher ratio for the endocrine islet area/pancreatic tissue area than that of the male and also a significantly higher ratio for both insulin-and glucagon-positive area/islet area in the female pancreas (compact and disseminated) than that of the male. In conclusion:The present study provides evidence on a unique localization of the disseminated pancreas in the oesophagus of catfish. Furthermore, we revealed sexrelated difference in the endocrine portion in both pancreatic tissues with more development in the female. The study suggests that sex hormones could be contributed to such sexual dimorphism. However, further investigation is required to compare the degree of development during the spawning and resting seasons. K E Y W O R D Sglucagon-secreting alpha cells, insulin-secreting beta cells, islets of Langerhans, oesophagus, pancreas | 595 KARKIT eT Al.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Unique localization of disseminated pancreas in the oesophagus of catfish (clarias gariepinus) with reference to sexual dimorphism

Karkit

Salem

Bareedy

et al. 2021

Anat Histol Embryol

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“…Trigeminal ganglion was taken as the largest cranial nerve extending rostrally from underneath the hindbrain. Pancreatic tissue was taken as the fatty tissue that connects the triangular shape made by the liver, stomach, and spleen as described in Luchini et al (2015) . Animals were captured, held, and euthanized under permit (33/2017) from the Foreign and Colonial Office of the United Kingdom under the Antarctic Act 1994/Antarctic Act 2013, Antarctic Regulations 1995/490 (as amended).…”

Section: Methodsmentioning

confidence: 99%

Evolution of Transient Receptor Potential (TRP) Ion Channels in Antarctic Fishes (Cryonotothenioidea) and Identification of Putative Thermosensors

York

Zakon

2022

Genome Biology and Evolution

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Animals rely on their sensory systems to inform them of ecologically relevant environmental variation. In the Southern Ocean, the thermal environment has remained between -1.9 and 5 °C for 15 million years, yet we have no knowledge of how an Antarctic marine organism might sense their thermal habitat as we have yet to discover a thermosensitive ion channel that gates (opens/closes) below 10 °C. Here, we investigate the evolutionary dynamics of transient receptor potential (TRP) channels, which are the primary thermosensors in animals, within cryonotothenioid fishes—the dominant fish fauna of the Southern Ocean. We found cryonotothenioids have a similar complement of TRP channels as other teleosts (∼28 genes). Previous work has shown that thermosensitive-gating in a given channel is species specific, and multiple channels act together to sense the thermal environment. Therefore, we combined evidence of changes in selective pressure, gene gain/loss dynamics, and the first sensory ganglion transcriptome in this clade to identify the best candidate TRP channels that might have a functional dynamic range relevant for frigid Antarctic temperatures. We concluded that TRPV1a, TRPA1b, and TRPM4 are the likeliest putative thermosensors, and found evidence of diversifying selection at sites across these proteins. We also put forward hypotheses for molecular mechanisms of other cryonotothenioid adaptations, such as reduced skeletal calcium deposition, sensing oxidative stress, and unusual magnesium homeostasis. By completing a comprehensive and unbiased survey of these genes, we lay the groundwork for functional characterization and answering long-standing thermodynamic questions of thermosensitive gating and protein adaptation to low temperatures.

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“…It is also worth noting that the B granules containing the crystalline‐like core in the embryonic pancreas of the grass snake are similar to the B granules that have been described in the pancreas of most vertebrate species (Bencosme & Pease, ; Pictet & Rutter, ; Hotta, Mabuchi, & Watari, ; Slack, ). Such granules have been described in the adult pancreas of catfish (Luchini, Wicki, & Romano, ), cat (Bencosme & Pease, ; Legg, ), dog (Hotta et al, ), and rat (Greider, Howell, & Lacy, ; Michael, Carroll, Swift, & Steiner, ), as well as in the pancreas of vertebrate embryos (Pictet & Rutter, ; Miralles et al, ). Therefore, what causes the pancreatic B granules in most vertebrate species to have a crystalline core?…”

Section: Discussionmentioning

confidence: 97%

Ultrastructure of endocrine pancreatic granules during pancreatic differentiation in the grass snake, Natrix natrix L. (Lepidosauria, Serpentes)

Kowalska

Rupik

2017

Journal of Morphology

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We used transmission electron microscopy to study the pancreatic main endocrine cell types in the embryos of the grass snake Natrix natrix L. with focus on the morphology of their secretory granules. The embryonic endocrine part of the pancreas in the grass snake contains four main types of cells (A, B, D, and PP), which is similar to other vertebrates. The B granules contained a moderately electron-dense crystalline-like core that was polygonal in shape and an electron-dense outer zone. The A granules had a spherical electron-dense eccentrically located core and a moderately electron-dense outer zone. The D granules were filled with a moderately electron-dense non-homogeneous content. The PP granules had a spherical electron-dense core with an electron translucent outer zone. Within the main types of granules (A, B, D, PP), different morphological subtypes were recognized that indicated their maturity, which may be related to the different content of these granules during the process of maturation. The sequence of pancreatic endocrine cell differentiation in grass snake embryos differs from that in many vertebrates. In the grass snake embryos, the B and D cells differentiated earlier than A and PP cells. The different sequence of endocrine cell differentiation in snakes and other vertebrates has been related to phylogenetic position and nutrition during early developmental stages.

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The Ultrastructure of Secretory Cells of the Islets of Langerhans in South American Catfish Rhamdia quelen

Cited by 8 publications

References 12 publications

Unique localization of disseminated pancreas in the oesophagus of catfish (clarias gariepinus) with reference to sexual dimorphism

Unique localization of disseminated pancreas in the oesophagus of catfish (clarias gariepinus) with reference to sexual dimorphism

Evolution of Transient Receptor Potential (TRP) Ion Channels in Antarctic Fishes (Cryonotothenioidea) and Identification of Putative Thermosensors

Ultrastructure of endocrine pancreatic granules during pancreatic differentiation in the grass snake, Natrix natrix L. (Lepidosauria, Serpentes)

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