Immunohistochemical study of the pancreatic endocrine cells of the ray, dasyatis akajei.

Sekine, Yuriko; Yui, Ryogo

doi:10.1679/aohc1950.44.95

Cited by 15 publications

(8 citation statements)

References 11 publications

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“…1g, h) which reflects an early state of combined exocrine-endocrine relationship among vertebrates (Epple and Brinn, 1987). In elasmobrachs (sharks, skates, and rays) the pancreas is of an irregular, often bilobed, (dorsal and ventral portions) shape (Sekine and Yui, 1981) and it usually lies below the anterior end of the intestine and extends as far as the pyloris. In the holocephalan (chimeras) the pancreas is FIG.…”

Section: General Morphology Of the Islet Organ In Chondrichthyesmentioning

confidence: 99%

“…Even from the small number of descriptions presently available it seems that there may be considerable variation in the types of islet-duct relationships within orders and families of elasmobranchs. For example, the pancreatic endocrine cells of the ray Dasyatis akajei are described as representing the most ''primitive'' arrangement among elasmobranchs in being present as a layer beneath an inner ductular epithelium (Sekine and Yui, 1981). In contrast the starry ray, Raja radiata, is described as having large and small islets (Jö nsson, 1991).…”

Section: General Morphology Of the Islet Organ In Chondrichthyesmentioning

confidence: 99%

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Ontogenetic and Phylogenetic Development of the Endocrine Pancreas (Islet Organ) in Fishes

Youson

Al‐Mahrouki

1999

General and Comparative Endocrinology

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The morphology of the gastroenteropancreatic (GEP) system of fish was reviewed with the objective of providing the phylogenetic and ontogenetic development of the system in this vertebrate group, which includes agnathans and gnathostome cartilaginous, actinoptyerygian, and sarcopterygian fish. Particular emphasis is placed on the fish homolog of the endocrine pancreas of other vertebrates, which is referred to as the islet organ. The one-hormone islet organ (B cells) of larval lampreys is the most basic pattern seen among a free-living vertebrate, with the two-hormone islet organ (B and D cells) of hagfish and the three-hormone islet organ (B, D, and F cells) of adult lampreys implying a phylogenetic trend toward the classic four-hormone islet tissue (B, D, F, and A cells) in most other fish. An earlier stage in the development of this phylogenetic sequence in vertebrates may have been the restriction of islet-type hormones to the alimentary canal, like that seen in protochordates. The relationship of the islet organ to exocrine pancreatic tissue, or its equivalent, is variable among bony, cartilaginous, and agnathan fishes and is likely a manifestation of the early divergence of these piscine groups. Variations in pancreatic morphology between individuals of subgroups within both the lamprey and chondrichthyan taxa are consistent with their evolutionary distance. A comparison of the distribution and degree of concentration of the components of the islet organ among teleosts indicates a diffuse distribution of relatively small islets in the generalized euteleosts and the tendency for the concentration into Brockmann bodies of large (principal) islets (with or without secondary islets) in the more derived forms. The holostean actinopterygians (Amiiformes and Semiontiformes) share with the basal teleosts (osteoglossomorphs, elopomorphs) the diffuse arrangement of the components of the islet organ that is seen in generalized euteleosts. Since principal islets are also present in adult lampreys the question arises whether principal islets are a derived or a generalized feature among teleosts. There is a paucity of studies on the ontogeny of the GEP system in fish but it has been noted that the timing of the appearance of the islet cell types parallels the time that they appear during phylogeny; the theory of recapitulation has been revisited. It is stressed that the lamprey life cycle provides a good opportunity for studying the development of the GEP system. There are now several markers of cell differentiation in the mammalian endocrine pancreas which would be useful for investigating the development of the islet organ and cells of the remaining GEP system in fish.

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Section: General Morphology Of the Islet Organ In Chondrichthyesmentioning

confidence: 99%

Section: General Morphology Of the Islet Organ In Chondrichthyesmentioning

confidence: 99%

Ontogenetic and Phylogenetic Development of the Endocrine Pancreas (Islet Organ) in Fishes

Youson

Al‐Mahrouki

1999

General and Comparative Endocrinology

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“…In the elasmobranchs, the pancreas develops from the dorsal anlage only (Siwe, 1926). Immunocytochemically, A, B, D, F, and GIP (gastric inhibitory peptide) cells have been identified in the islet organs of elasmobranchs (Sekine and Yui, 1981;El-Salhy, 1984). In some forms, there are also smaller islets which seem to bud off from the exocrine duct system.…”

Section: / Chondrichthyesmentioning

confidence: 99%

Pancreatic Islets

Epple

1986

Morphological Considerations

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“…The pancreas of elasmobranchs is a distinct compact organ that reflects an early state of combined exocrineendocrine relationship among vertebrates (Epple and Brinn 1987). Several studies of the endocrine pancreas (Sekine and Yui 1981;El-Salhy 1984;Conlon et al 1991;López et al 1999) using immunohistochemical techniques have revealed the existence of four endocrine cell types (A, B, D, and F) in the islets, as seen as in most bony fishes through to mammals. The FMRFa-IR cells were found as clusters in the islet tissue (Jönsson 1991).…”

Section: Discussionmentioning

confidence: 99%

An immunohistochemical study of Carassius RF amide in the stomach, intestine, and pancreas of the Japanese butterfly ray, Gymnura japonica

Inoue

Akiyoshi

2010

Ichthyol Res

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Carassius RFamide (C-RFa) is a brain-gut peptide, isolated originally from the brain of a teleost fish, Japanese crucian carp (Carassius auratus langsdorfii). It is a novel FMRFamide-related peptide sharing homologies with mammalian prolactin-related peptide. We observed the localization of C-RFa-like immunoreactivity (C-RFa-IR) in the stomach, intestine, and pancreas of Japanese butterfly ray using an immunohistochemical technique. In the whole gastrointestinal tract, C-RFa-IR was observed in smooth muscle cells, and in the Meissner's and Auerbach's plexus ganglia. Furthermore, in the stomach C-RFa-IR was also observed at the bottom of the fundic glands in both the body and pyloric region. In the intestine C-RFa-IR was observed in epithelial cells at the tip of mucosal folds. In the pancreas, C-RFa-IR was observed in islet cells. Thus, we suggest that ray C-RFa may have functional roles in both peripheral neurotransmission and endocrine function of the gastroenteropancreatic system.

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Immunohistochemical study of the pancreatic endocrine cells of the ray, dasyatis akajei.

Cited by 15 publications

References 11 publications

Ontogenetic and Phylogenetic Development of the Endocrine Pancreas (Islet Organ) in Fishes

Ontogenetic and Phylogenetic Development of the Endocrine Pancreas (Islet Organ) in Fishes

Pancreatic Islets

An immunohistochemical study of Carassius RF amide in the stomach, intestine, and pancreas of the Japanese butterfly ray, Gymnura japonica

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