Venom-Induced Immunosuppression: An Overview of Hemocyte-Mediated Responses (original) (raw)
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Journal of Insect Physiology, 2013
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, the most often reported being injection into the host of immunosuppressive factors, notably venom proteins, along with the egg. The analysis of venom components has been performed independently in species of different taxa, but the present picture is far from complete. Intriguingly, the question of the level of venom variability inside species has been neglected, although it may partly determine the potential for parasitoid adaptation. Here, we present a short review of our present knowledge of venom components in endoparasitoids, asell as of the only well-known example of intraspecific variability in a venom immune suppressive protein being responsible for variation in parasitoid virulence. We then present data evidencing inter-individual variation of venom protein profiles, using a gel electrophoresis approach, both in laboratory strains and field populations of a figitid and a braconid species. Whether occurrence of such variability may permit a selection of parasitoid venom components driven by the host remains to be tested, notably in the context of the production and use of biological control auxiliaries.
BMC Genomics, 2010
Background: The relationships between parasitoids and their insect hosts have attracted attention at two levels. First, the basic biology of host-parasitoid interactions is of fundamental interest. Second, parasitoids are widely used as biological control agents in sustainable agricultural programs. Females of the gregarious endoparasitoid Pteromalus puparum (Hymenoptera: Pteromalidae) inject venom along with eggs into their hosts. P. puparum does not inject polydnaviruses during oviposition. For this reason, P. puparum and its pupal host, the small white butterfly Pieris rapae (Lepidoptera: Pieridae), comprise an excellent model system for studying the influence of an endoparasitoid venom on the biology of the pupal host. P. puparum venom suppresses the immunity of its host, although the suppressive mechanisms are not fully understood. In this study, we tested our hypothesis that P. puparum venom influences host gene expression in the two main immunity-conferring tissues, hemocytes and fat body.
Biological Diversity and Conservation, 2021
Parasitic wasps inject their eggs, together with a complex venom mixture, in or on other insects. Parasitoid venoms use various mechanisms to manipulate the physiology and suppress the immune system of their hosts, thus enabling the growth and development of their offspring. Since the major mechanisms of innate immunity in insects are homologous to the Nuclear Factor kappa B (NF-κB) pathway in mammalian immunity, this study hypothesized that venom related immune suppression observed in host insects could also be observed in mammalian cells. Therefore, an NF-κB-dependent luciferase assay was used to determine the effects of P. turionellae venom on murine fibrosarcoma L929sA cells. Results from an MTT assay showed that venom from P. turionellae has no cytotoxic effects on L929sA cell lines when considering a defined range of exposure time and concentrations. Also, the present study indicated that endoparasitoid P. turionellae venom has potential to inhibit NF-κB signaling in cells of mammals at nontoxic concentrations. In conclusion, venom components from ecto-or endoparasitoid wasps have anti-inflammatory potential on increased immune responses of mammalian cells.
Time-dependent effect of desensitization with wasp venom on selected parameters of the immune system
Scientific Reports
The emergence of tolerance during Hymenoptera venom immunotherapy (VIT) is a complex process. The main goal of VIT is to induce a change from proinflammatory Th2 response to the Th1 response. However, the immune mechanism of acquiring rapid tolerance during VIT has not yet been fully understood. Therefore, we have analyzed (in 4-time points: 0, 2, 6, and 24 weeks after the initiation phase of VIT) the concentration of complement C3, C4, and C5 components, lymphocyte subpopulations (flow cytometry), as well as histamine and tryptase serum concentrations of 43 patients with wasp venom allergy (III and IV Müller grade) classified to ultra-rush treatment and 18 volunteers as the control group (CG). We observed that VIT affected the immune system by inducing changes in the complement system (decreased C3 and C4 compartment protein concentrations) and "normalized" the percentage of lymphocytes and neutrophils in the peripheral blood. Moreover, a significant increase in the perce...
Hymenoptera venom immunotherapy
Journal of Allergy and Clinical Immunology, 1989
The specific cell-mediated and humoral immune responses of I4 children allergic to honeybee venom were studied. An &day rush venom immunotherapy induced an increase in T proliferative (p < 0.04) and T suppressive (p < 0.003) cell-spec$c activities. Antibody variations, an increase in spectjic IgG4 (p f 0.0.5), and a decrease in speci$c IgE (p < O.OI) were observed 1 year later. Initial high T suppressive cell activity prevents T proliferative cell increase during rush venom immunotherapy. High initial levels of specific IgGI and speci$c lgG4 have opposing effects on the increase in T suppressive cell activity, the former being positively correlated with intensive increase (r = 0.840; p < O.OOS), the latter negatively with T suppressive crll increase (r = -0.709; p < 0.001). These data indicate that there are interrelationships between the cell-mediated immunity and the antibody responses in honeybee allergy. (J ALLERGY CLIN IMMUNOL 1989;83:563-71.) fecting at least 0.4% to 0.8%2A and perhaps up to