e-journal
Immunological resilience of a freshwater Indian mollusc duringaestivation and starvation
Freshwater snail, Pila globosa is an edible mollusc which bears commercial and ethnomedicinal signifi-cance. During environmental aridity, P. globosa aestivates deep into the soil for four to five months. Wereport comparative analyses of immune associated parameters in the hemocytes and hemolymph of P.globosa during activity, experimental aestivation, arousal and starvation. Hemocyte is a major cellularcomponent of molluscan immune system. They are functionally involved in phagocytosis, cytotoxicity,antioxidative defence and enzyme mediated lysosomal pathogen degradation. Determination of the totalhemocyte count, phagocytosis, generation of superoxide anion, nitric oxide and activities of phenolox-idase, superoxide dismutase, catalase, glutathione-S-transferase, phosphatases and protein content inthe hemocytes and hemolymph were carried out during the mentioned phases of life process of P. glo-bosa. Total count of hemocyte was recorded to be higher during aestivation, arousal and starvation incomparison to the phase of activity. Phagocytic response of hemocytes of P. globosa was highest duringphase of activation. P. globosa exhibited high level of generation of superoxide anion and nitric oxide inthe hemocytes during aestivation. Activity of phenoloxidase was recorded to be highest in the hemo-cytes and hemolymph among the starved individuals. Activities of superoxide dismutase and catalasewere highest in the hemocytes of starved P. globosa. Glutathione-S-transferase activity was estimatedto be high in the hemolymph and hemocytes of active specimens. Aestivation and starvation exhibitedmodulation in the activities of phosphatases in the hemocytes and hemolymph. Total content of proteinof hemocytes was recorded to be low in the aestivated, aroused and starved P. globosa in comparisonto the active ones. Nonuniform status of the immune parameters of hemocytes and hemolymph duringactivity, aestivation, arousal and starvation was indicative to a status of immunological resilience of thespecies to ensure adaptation during different physiological and environmental conditions.
Keywords:AestivationHemocytesNitric oxidePhagocytosisPhenoloxidaseSuperoxide aniona
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