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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
1
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pubmed:dateCreated |
1981-12-15
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pubmed:abstractText |
The ultrastructure of the calcium-sensitive (Ca-s) (PAS-positive) cells of the pars intermedia was investigated in eels kept in hypo- and hyperosmotic environments. Although the cells were moderately active in fresh water (FW), they were highly stimulated in deionized water (DW) and displayed an enlarged Golgi apparatus, a distinct rough endoplasmic reticulum, few secretory granules, some microtubules and an extended area of contact with the basal lamina that separates nervous and glandular tissues. Some mitosing cells were seen. A similar picture was observed in eels kept in sea water (SW) for 45 days, returned to FW and subsequently to DW for 21 days. In SW (20 and 33%), and particularly in concentrated SW (50, 60 and 63%), the Ca-s cells were inactive. Their granules were significantly smaller than in eels kept in FW, and the area of contact with the basal lamina was greatly reduced. However, signs of granule-release were seen in eels adapted to 50 and 60% SW. Nerve fibers rarely contacted the Ca-s cells and did not synapse with them. The ultrastructural data support the hypothesis that the Ca-s cells of Anguilla, like those of Carassius, are involved in ionic regulation. MSH cells were not greatly affected by the present experiments.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:issn |
0302-766X
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
219
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
9-26
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:7285100-Animals,
pubmed-meshheading:7285100-Calcium,
pubmed-meshheading:7285100-Eels,
pubmed-meshheading:7285100-Fresh Water,
pubmed-meshheading:7285100-Histocytochemistry,
pubmed-meshheading:7285100-Male,
pubmed-meshheading:7285100-Melanocyte-Stimulating Hormones,
pubmed-meshheading:7285100-Microscopy, Electron,
pubmed-meshheading:7285100-Nerve Fibers,
pubmed-meshheading:7285100-Neural Pathways,
pubmed-meshheading:7285100-Periodic Acid-Schiff Reaction,
pubmed-meshheading:7285100-Pituitary Gland,
pubmed-meshheading:7285100-Seawater,
pubmed-meshheading:7285100-Time Factors,
pubmed-meshheading:7285100-Water,
pubmed-meshheading:7285100-Water-Electrolyte Balance
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pubmed:year |
1981
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pubmed:articleTitle |
Ultrastructural changes in the calcium-sensitive (PAS-positive) cells of the pars intermedia of eels kept in deionized water and in normal and concentrated sea water.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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