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Barrier Immune Effectors Are Maintained during Transition from Nurse to Forager in the Honey Bee

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  • Jamal M Jefferson
  • Hilary A Dolstad
  • Meera D Sivalingam
  • Jonathan W Snow

Abstract

Foragers facilitate horizontal pathogen transmission in honey bee colonies, yet their systemic immune function wanes during transition to this life stage. In general, the insect immune system can be categorized into mechanisms operating at both the barrier epithelial surfaces and at the systemic level. As proposed by the intergenerational transfer theory of aging, such immunosenescence may result from changes in group resource allocation. Yet, the relative influence of pathogen transmission and resource allocation on immune function in bees from different stages has not been examined in the context of barrier immunity. We find that expression levels of antimicrobial peptides (AMPs) in honey bee barrier epithelia of the digestive tract do not follow a life stage-dependent decrease. In addition, correlation of AMP transcript abundance with microbe levels reveals a number of microbe-associated changes in AMPs levels that are equivalent between nurses and foragers. These results favor a model in which barrier effectors are maintained in foragers as a first line of defense, while systemic immune effectors are dismantled to optimize hive-level resources. These findings have important implications for our understanding of immunosenescence in honey bees and other social insects.

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  • Jamal M Jefferson & Hilary A Dolstad & Meera D Sivalingam & Jonathan W Snow, 2013. "Barrier Immune Effectors Are Maintained during Transition from Nurse to Forager in the Honey Bee," PLOS ONE, Public Library of Science, vol. 8(1), pages 1-10, January.
    • Handle: RePEc:plo:pone00:0054097
    DOI: 10.1371/journal.pone.0054097
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    References listed on IDEAS

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    1. Schmickl, Thomas & Crailsheim, Karl, 2007. "HoPoMo: A model of honeybee intracolonial population dynamics and resource management," Ecological Modelling, Elsevier, vol. 204(1), pages 219-245.
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