Calcium homeostasis in low and high calcium water acclimatized Oreochromis mossambicus exposed to ambient and dietary cadmium.

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dc.contributor.authorPratap, H Ben_US
dc.contributor.authorWendelaar Bonga, S Een_US
dc.date.accessioned2007-04-13en_US
dc.date.accessioned2009-06-02T04:26:36Z
dc.date.available2007-04-13en_US
dc.date.available2009-06-02T04:26:36Z
dc.date.issued2007-04-13en_US
dc.description.abstractThe effects of cadmium administered via ambient water (10 microg/l) or food (10 microgCd/fish/day) on plasma calcium, corpuscles of Stannius and bony tissues of Oreochromis mossambicus acclimated to low calcium (0.2 mM) and high calcium (0.8 mM) water were studied for 2, 4, 14 and 35 days. In low calcium water acclimated fish, ambient cadmium induced significant hypocalcemia, while the structure and morphometry of type-1 and type-2 cells of corpuscles of Stannius were not affected on day 2 and 4. Subsequently on day 14 and 35, recovery of plasma calcium to normal levels was observed followed by a decrease in corpuscles of Stannius index (CSI), cell size, volume of granular endoplasmic reticulum (p < 0.05) of type-1 cells in both, fish exposed to ambient or dietary cadmium. The type-2 cells were not affected. In high calcium water acclimated fish both, ambient and dietary cadmium caused a significant reduction of plasma calcium levels on day 2 and 4. In these fish, there was a significant transient increase in the size of corpuscles of Stannius on day 4, followed by recovery on day 14 and 35. Ultrastructural observations of corpuscles of Stannius revealed that cadmium did not cause any cellular damage on type- and type-2 cells during 35 days exposure. In low or high calcium water acclimatized tilapia exposed to ambient or dietary cadmium had no effect on the calcium and phosphate composition of the scales, operculum and vertebrae. Thus, it is unlikely that recovery of hypocalcemia was due to the dissolution of calcium from bony tissues. This study also revealed that cadmium does not mediate stimulation of the corpuscles of Stannius gland, and that high Ca2+ water had a protective effect against ambient and dietary cadmium.en_US
dc.description.affiliationDepartment of Zoology and Wildlife Conservation, University of Dar es Salaam, Dar es Salaam-35064, Tanzania. pratap@udsm.ac.tzen_US
dc.identifier.citationPratap HB, Wendelaar Bonga SE. Calcium homeostasis in low and high calcium water acclimatized Oreochromis mossambicus exposed to ambient and dietary cadmium. Journal of Environmental Biology. 2007 Apr; 28(2 Suppl): 385-93en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/113774
dc.language.isoengen_US
dc.source.urihttps://www.geocities.com/j_environ_biol/en_US
dc.subject.meshAdaptation, Physiologicalen_US
dc.subject.meshAnimalsen_US
dc.subject.meshBone and Bones --drug effectsen_US
dc.subject.meshCadmium --toxicityen_US
dc.subject.meshCalcium --blooden_US
dc.subject.meshDieten_US
dc.subject.meshEndocrine Glands --drug effectsen_US
dc.subject.meshHomeostasisen_US
dc.subject.meshHypocalcemia --chemically induceden_US
dc.subject.meshMaleen_US
dc.subject.meshPhosphates --metabolismen_US
dc.subject.meshProtective Agents --pharmacologyen_US
dc.subject.meshTilapia --metabolismen_US
dc.subject.meshWater Pollutants, Chemical --toxicityen_US
dc.titleCalcium homeostasis in low and high calcium water acclimatized Oreochromis mossambicus exposed to ambient and dietary cadmium.en_US
dc.typeJournal Articleen_US
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