The exogenous Calcium as a biomarker of the use of alternative metabolic via by Biomphalaria spp (Mollusca, Planorbidae)
DOI:
https://doi.org/10.5216/rbn.v16i2.53324Keywords:
Calcium carbonate, Host snails for schistosomiasis, Nitrogenated products, Alternative metabolic pathwaysAbstract
Snails of the genus Biomphalaria are hosts of the parasite Schistosoma mansoni, as well as bioindicators of environmental quality. These snails use carbohydrates as the primary source of energy and amino acids in the "new" synthesis of glucose by gluconeogenesis. The concentration of exogenous Ca2+ affects the energetic metabolism of these snails. This study evaluated the use of an alternative metabolic pathway by Biomphalaria tenagophila and B. glabrata exposed to 20, 40, 60, 80 and 100 mg/L CaCO3 for 30 days. From each group, samples of hemolymph of fifteen snails from each group were used assess the level of total protein, urea, uric acid and creatinine by spectrophotometry. In general, there was an increase of total proteins and reduction of urea, in both species, exposed to the higher concentrations of CaCO3, when compared to the control. Uric acid also increased for both species in the highest concentrations of CaCO3. Higher creatinine values were observed in B. tenagophila and B. glabrata exposed, respectively, to 20 and 40 mg CaCO3. The use of proteins as energetic substrate was observed mainly in the exposure to 20 mg of CaCO3, besides particularities in the regulation of physiological mechanisms were observed in these hosts of S. mansoni.
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