Postembryonic development of sexually dimorphic glomeruli and related interneurons in the cockroach Periplaneta americana

Neuroscience Letters
Hiroshi NishinoMakoto Mizunami

Abstract

In most insects, sex pheromone is processed by an enlarged glomerular complex (macroglomerular complex, MGC) in the male antennal lobe (first-order olfactory center). The MGC of the American cockroach consists of two closely located A- and B-glomeruli which are responsible for processing the major sex pheromone components, periplanone-A and -B, respectively. Using anterograde dye injection, we investigated sexual dimorphism in sensory afferents and interneuron. The A- and B-glomeruli exist in the first larval instar of both sexes. The female MGC homolog grows at a relatively constant rate (1.2-1.8-fold growth per molt) throughout development, whereas the male MGC shows a period of accelerated growth between the fifth and ninth instars, where volume can be more than double in a single molt. These different growth patterns resulted in a 1:30 ratio in glomerular complex volumes of adult females versus males. In the female MGC homolog, afferents originating from the dorsal and ventral antennal surfaces were biased toward anterior and posterior regions, and segregation of these afferents was less clear compared to the adult male. The staining of interneurons projecting to the protocerebrum revealed that projection patterns character...Continue Reading

References

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Citations

Apr 24, 2013·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Wolfgang Rössler, Martin F Brill
Dec 22, 2016·The Journal of Comparative Neurology·Thomas CarleFumio Yokohari
Jul 26, 2018·Genetics and Molecular Biology·Ana Lúcia Anversa SegattoJoão Batista Teixeira da Rocha
Mar 24, 2017·Zoological Letters·Ko KatohHiroshi Nishino
Feb 8, 2020·Scientific Reports·Kosuke TateishiHidehiro Watanabe
Jan 25, 2021·Cell and Tissue Research·Debora Fuscà, Peter Kloppenburg

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