cGMP modulates responses to queen mandibular pheromone in worker honey bees
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Responses to social cues, such as pheromones, can be modified by genotype, physiology, or environmental context. Honey bee queens produce a pheromone (queen mandibular pheromone; QMP) which regulates aspects of worker bee behavior and physiology. Forager bees are less responsive to QMP than young bees engaged in brood care, suggesting that physiological changes associated with behavioral maturation modulate response to this pheromone. Since 3′,5′-cyclic guanosine monophosphate (cGMP) is a major regulator of behavioral maturation in workers, we examined its role in modulating worker responses to QMP. Treatment with a cGMP analog resulted in significant reductions in both behavioral and physiological responses to QMP in young caged workers. Treatment significantly reduced attraction to QMP and inhibited the QMP-mediated increase in vitellogenin RNA levels in the fat bodies of worker bees. Genome-wide analysis of brain gene expression patterns demonstrated that cGMP has a larger effect on expression levels than QMP, and that QMP has specific effects in the presence of cGMP, suggesting that some responses to QMP may be dependent on an individual bees’ physiological state. Our data suggest that cGMP-mediated processes play a role in modulating responses to QMP in honey bees at the behavioral, physiological, and molecular levels.
KeywordsBehavioral genetics Neuroethology Honey bees Pheromone Communication
8-Bromo-cGMP, an analog of cGMP
3′,5′-Cyclic guanosine monophosphate
cGMP-dependent protein kinase
Queen mandibular pheromone
Quantitative real time PCR
Single drone inseminated
We would like to thank S. Kocher for advice on the microarray analyses, J. Flowers for expert beekeeping assistance, T. Crowgey and H. Yamamoto for assistance with the behavioral assays, and the rest of the Grozinger lab for insightful comments and helpful discussions. This research was supported by an NIH-NIDCD grant to G.E. Robinson (subcontract to C.M.G.) and an NSF CAREER grant to C.M.G. Animal care and collection of data was in accordance with US laws. The authors declare no competing interests.
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