Effects of sublethal concentrations of potassium dichromate on the occurrence of splenic melano-macrophage centres in juvenile plaice, Pleuronectes platessa, L

Autor:	J. Gercken, H. Kranz
Rok vydání:	1987
Předmět:	Pleuronectes biology Spleen Anatomy Aquatic Science Within blood vessels biology.organism_classification Melanin Andrology chemistry.chemical_compound medicine.anatomical_structure chemistry Splenic Tissue medicine Macrophage Juvenile Potassium dichromate Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Fish Biology. 31:75-80
ISSN:	1095-8649 0022-1112
DOI:	10.1111/j.1095-8649.1987.tb05296.x
Popis:	Plaice were exposed to 0.5 and 2.0 ppm potassium dichromate (K2Cr2O7) concentrations for 27 days. In both water concentrations chromium was accumulated up to a level of 400 ppb in the carcass of the fish. At the same time the number of splenic melano-macrophage centres (MMC) tripled, whereas their average size was reduced to one third. The percentage area of MMC in the splenic tissue remained unchanged. Histological alterations following exposure to K2Cr2O7 included increases both in melanin content of the MMC and in the number of melanin-containing cells within blood vessels; also, the splenic ellipsoids became less clearly demarcated. Splenic melano-macrophages show a decreased ability to aggregate to form large MMC under the influence of K2Cr2O7, which leads to the assumption that the turnover rate of macrophage settlement in, and macrophage elimination from, the spleen is increased.
Databáze:	OpenAIRE
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