The effect of Beauveria bassiana infection on cell mediated and humoral immune response in house fly, Musca domestica L.
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Entomopathogenic fungi that manifest infections by overcoming insect’s immune response could be a successful control agent for the house fly, Musca domestica L. which is a major domestic, medical, and veterinary pest. In this study, the immune response of house fly to Beauveria bassiana infection was investigated to reveal fundamental aspects of house fly hemocyte biology, such as hemocyte numbers and size, which is poorly understood. The total hemocyte counts (THCs) in B. bassiana-infected house fly showed an initial increase (from 6 to 9 h), followed by subsequent decrease (9 to 12 h) with increase in time of infection. The THCs was slightly greater in infected flies than the non-infected ones. Insight into relative hemocyte counts depicted a significant increase in prohemocyte (PR) and decrease in granulocyte (GR) in infected house flies compared to non-infected ones. The relative cell area of hemocyte cells showed a noticeable increase in PR and intermediate cells (ICs), while a considerable reduction was observed for plasmatocyte (PL) and GR. The considerable variation in relative cell number and cell area in the B. bassiana-infected house flies indicated stress development during infection. The present study highlights changes occurring during B. bassiana invasion to house fly leading to establishment of infection along with facilitation in understanding of basic hemocyte biology. The results of the study is expected to help in better understanding of house fly immune response during fungal infection, so as to assist production of more efficient mycoinsecticides for house fly control using B. bassiana.
KeywordsMusca domestica Beauveria bassiana Cell-mediated immune response Hemocyte Pathogenesis
This work was supported by Indian Council of Medical Research (IRIS_ID No. 201007860), India. CSIR fellowship to one of the authors (SM) is gratefully acknowledged. The authors also acknowledge Mr. Satendar Singh (IIT Delhi, India) for his help in experimental work.
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