Abstract
Vitellogenins are the major yolk proteins, synthesized in the fat body, released into the hemolymph and captured by the developing oocytes, but the mechanisms by which these proteins cross the follicular cell layer are still poorly understood. This study describes the actin distribution in follicular cells during vitellogenin transport to the oocyte in social Hymenoptera represented by bees Apis mellifera and Melipona quadrifasciata, the wasp Mischocyttarus cassununga and the ant Pachycondyla curvinodis. In oocytic chambers of vitellogenic follicles, vitellogenin was found within the follicular cells, perivitelline space and oocyte, indicating a transcellular route from the hemolymph to the perivitelline space. The cortical actin cytoskeleton in follicular cells underwent reorganization during transport of vitellogenin across this epithelium suggesting that in the ovary of social hymenopterans, vitellogenin delivery to oocytes requires a dynamic cytoskeletal rearrangement of actin filaments in the follicular cells.
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Acknowledgments
This research was supported by Brazilian research Agencies, FAPEMIG, CNPq, and CAPES. Authors are grateful to Nucleus of Microscopy and Microanalysis at Federal University of Viçosa for technical assistance and to anonymous reviewers for criticism and manuscript improvement.
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The authors declare that they have no conflict of interest.
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Ronnau, M., Azevedo, D.O., Fialho, M.d.C.Q. et al. Changes in follicular cells architecture during vitellogenin transport in the ovary of social Hymenoptera. Protoplasma 253, 815–820 (2016). https://doi.org/10.1007/s00709-015-0843-0
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DOI: https://doi.org/10.1007/s00709-015-0843-0