Abstract
The effects of the widely used neurotoxic pyrethroid insecticides on neuronal development or plasticity are unclear. To expand knowledge about the influence of the pyrethroid fenvalerate on neuronal development, metamorphic remodelling of the primary olfactory neuropil of the beetle Tenebrio molitor has been studied. The antennal lobe is subdivided into distinct glomeruli before metamorphosis. This is in contrast to that which occurs in other well-studied holometabolous insects such as the moth Manduca sexta and the honeybee. As an indicator of antennal lobe interneurons, locusta-tachykinin immunoreactive neurons have been used. They project into the antennal lobes and form tufted arbors in larval and adult stages within glomeruli throughout the neuropil. These glomerular structures are invaded by glomerular sensory afferent axons and are surrounded by processes of glia cells. With pupation, the glomerulization is lost and no locusta-tachykinin or substance P immunoreactivity is visible in the antennal lobe. The immunoreactivity reappears during metamorphosis, starting with diffusely branched arbors that later become tufted. Application of the neurotoxic insecticide fenvalerate at pupation in sublethal concentrations resulted in a loss or reduction of glomerular pattern formation by neurons and glia cells during metamorphosis. Labelling of antennal sensory axons revealed that the olfactory neuropil was not deafferented, and also that the sensory axons were not organized into a normal glomerular pattern. In addition to the morphological differences, fenvalerate treatment caused locusta-tachykinin immunoreactivity to reappear prematurely during metamorphosis. Possible reasons for fenvalerate-induced alterations in antennal lobe development and their implications for normal development are discussed.
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Wegerhoff, R. (1998). Metamorphic development of locusta-tachykinin immunoreactive neurons of the antennal lobes of the beetle Tenebrio molitor and the effect of fenvalerate application. In: EBO — Experimental Biology Online Annual 1996/97. EBO — Experimental Biology Online Annual, vol 1996/1997. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-00932-1_24
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