Abstract：
:To develop inside their insect hosts, endoparasitoid wasps must either evade or overcome the host's immune system. Several ichneumonid and braconid wasps inject polydnaviruses that display well-studied immune suppressive effects. However, little is known about the strategies of immunoevasion used by other parasitoid families, such as figitid wasps. The present study provides experimental evidence, based on superparasitism and injection experiments, that the figitid species Leptopilina boulardi uses an active mechanism to suppress the Drosophila melanogaster host immune response, i.e. the encapsulation of the parasitoid eggs. The immune suppressive factors are localised in the long gland and reservoir of the female genital tractus, where virus-like particles (VLPs) have been observed. Parasitism experiments using a host tumorous strain indicate that these factors do not destroy host lamellocytes but that they impair the melanisation pathway. Interestingly, they are not susceptible to heating and are not depleted with prolonged oviposition experience, in contrast to observations reported for L. heterotoma, another figitid species. The mechanisms that prevent encapsulation of eggs from L. boulardi and L. heterotoma differ in several respects, suggesting that different physiological strategies of immunosuppression might be used by specialised and generalist parasitoids.
journal_name
J Insect Physioljournal_title
Journal of insect physiologyauthors
Labrosse C,Carton Y,Dubuffet A,Drezen JM,Poirie Mdoi
10.1016/s0022-1910(03)00054-4keywords:
subject
Has Abstractpub_date
2003-05-01 00:00:00pages
513-22issue
5eissn
0022-1910issn
1879-1611pii
S0022191003000544journal_volume
49pub_type
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：1997-08-01 00:00:00
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pub_type： 杂志文章
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更新日期：2009-09-01 00:00:00
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更新日期：2005-04-01 00:00:00
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更新日期：2019-07-01 00:00:00
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pub_type： 杂志文章
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更新日期：2018-01-01 00:00:00
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journal_title：Journal of insect physiology
pub_type： 杂志文章
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更新日期：2014-09-01 00:00:00
abstract：:Endoparasitoid wasps develop at the expense of other insects, leading to their death. Eggs deposited inside the host body induce an immune response, which results in the formation of a melanized cellular capsule around the egg. To evade or counteract this response, endoparasitoids have evolved different strategies, th...
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：2018-04-01 00:00:00
abstract：:Dropping off is considered an anti-predator behavior for aphids since previous studies have shown that it reduces the risk of predation. However, little attention is paid to dropping behavior triggered by other external stresses such as daytime high temperatures which are predicted to become more frequent in the conte...
journal_title：Journal of insect physiology
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