1887

Abstract

polydnavirus (MdPDV) is associated with , a parasitic wasp that attacks the larval stage of the lepidopteran . Previously, we observed that MdPDV induced several alterations in the granular cells and plasmatocytes of , the primary haemocytes involved in regulating the cellular immune response toward and other parasites. In examining the mechanisms underlying immunosuppression of this host, we found that MdPDV induced apoptosis of granular cells. Granular cells underwent apoptosis both when virus was injected into the haemocoel of larvae and after infection with MdPDV . Characteristics of MdPDV-induced apoptosis included condensation of chromatin, cell surface blebbing and fragmentation of DNA into a 200 bp ladder. Although MdPDV induced changes in the ability of plasmatocytes to adhere to foreign surfaces, apoptosis of this morphotype was not observed. Examples from the literature suggest that some viruses promote their own survival by suppressing apoptosis of host cells. However, since polydnaviruses are likely to be transmitted vertically, we suggest that MdPDV promotes its own survival by inducing apoptosis of host immune cells which would otherwise kill the developing egg.

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1995-02-01
2022-01-22
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