Postembryonic development of the antennal lobes in Periplaneta americana L.

Prillinger, Linde

doi:10.1007/bf00233532

Cited by 53 publications

(37 citation statements)

References 18 publications

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“…Recently we showed that the MGC in the male is not formed by fusion of several glomeruli in late larval stages, as suggested in previous studies [15,22], but that the precursors of the Aand B-glomeruli already exist in the first larval instar [13]. We also showed differences in A-and B-glomeruli growth rates, both relative to each other and over time [13].…”

Section: Introductionsupporting

confidence: 86%

“…Morphologically the PNs were similar in both sexes at all developmental stages, as has been reported previously [15]. An important exception is the very few projections to the antero-medial region of the lateral horn in females (Fig.…”

Section: Introductionsupporting

confidence: 84%

“…In contrast to males, in which MGC volume increased 430 fold from the first larval instar to the adult [13], the female MGC homolog increased only 17-fold. This is similar to the 14-fold volume increase seen in ordinary glomeruli from the first instar to the adult [15].…”

Section: Introductionsupporting

confidence: 82%

“…Accordingly, all glomeruli in the AL grow in parallel to the increasing number of incoming chemosensory afferents [13,15].…”

Section: Introductionmentioning

confidence: 99%

“…As the number and location of glomeruli and related sensory tracts were very consistent from the first larval instar to the adult in both sexes [15], several landmarks used to identify the male MGC precursor [13] can be applied to the female homolog at different larval stages (Fig. 1c-i).…”

Section: Introductionmentioning

confidence: 99%

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

Nishino

Yoritsune

Mizunami

2010

Neuroscience Letters

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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 5th and 9th 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 characteristic of sex pheromone processing appear in the late 8th instar in males, while possibly homologous projections in the female were far fewer in number. These results suggest that the glomerular complexes in pre-8th larval males, and probably females, are not differentiated for specific detection of sex pheromone. Male-specific projections for sex pheromone detection may be formed by modification of pre-existing neural circuitry

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Section: Introductionsupporting

confidence: 86%

Section: Introductionsupporting

confidence: 84%

Section: Introductionsupporting

confidence: 82%

“…Accordingly, all glomeruli in the AL grow in parallel to the increasing number of incoming chemosensory afferents [13,15].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Nishino

Yoritsune

Mizunami

2010

Neuroscience Letters

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Influence of receptor axons on the formation of olfactory glomeruli in a hemimetabolous insect, the cockroachPeriplaneta americana

Salecker

Boeckh

1996

J. Comp. Neurol.

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The embryonic development of the hemimetabolous insect Periplaneta americana requires approximately 31 days. Deafferentation experiments were used to investigate the role of ingrowing receptor axons during embryogenesis, specifically their influence 1) on the subdivision of the antennal lobe neuropil into glomeruli, 2) on the morphology and number of glial cells, and 3) on the arborization pattern of central neurons. The flagellum of one antenna was removed from embryos at different developmental stages starting with day 10. Subsequently, they were raised in culture until a total age of 26 days. At day 10, the deutocerebrum has received only a very small number (ca. 0.4%) of antennal receptor axons; deafferentation at this stage allowed us to deprive the deutocerebrum of approximately 99% of its normal antennal input. Deafferentation has marked effects on the organization of the antennal lobe neuropil. The deafferented lobe is reduced in volume compared to the control side; the characteristic glomeruli are missing. During normal development glomeruli are formed between day 19 and 22, first in dorsal and then in ventral antennal lobe regions. By removing the antenna before day 20, their formation is disturbed in all parts of the antennal lobe. If deafferentation is performed after stage 20, glomeruli persist in dorsal regions, but are missing in ventral regions. On day 24 or later, glomeruli in both dorsal and ventral regions are unaffected by deafferentation. Glial cells continue to extend fine processes into the neuropil in the absence of ingrowing receptor axons. The number of glial cells is reduced compared to control lobes. Multiglomerular local interneurons and other gamma-amino butyric acid-immunoreactive neurons, as well as projection neurons, fail to develop glomerular arborization patterns in antennal lobes deprived of sensory axons.

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Early formation of sexually dimorphic glomeruli in the developing olfactory lobe of the brain of the mothManduca sexta

1998

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The antennal lobes (ALs), the primary olfactory centers, of the moth Manduca sexta are sexually dimorphic. Only ALs of males possess the macroglomerular complex (MGC), the site of primary processing of information about the female's sex pheromone. To understand the development of identified, odor-specific olfactory glomeruli, we investigated the cellular events involved in the morphogenesis of the MGC by means of various fluorescence staining techniques and laser-scanning confocal microscopy. The MGC lies near the entrance of the antennal nerve into the AL of the adult male and comprises three glomeruli, the globular cumulus and two toroidal structures. The MGC forms during early stages of metamorphic adult development through a stereotyped sequence of coordinated changes in MGC-specific receptor axons, glial cells, and early-ingrowing projection neurons of the medial group of AL neurons. The MGC divisions are the earliest glomeruli to form in the male AL, and their basic organization is established within about 3 days after ingrowth of the first sensory axons. Despite their special anatomical features, the MGC glomeruli develop in a manner similar to that of the ordinary glomeruli. Comparison of the ALs of males and females reveals that two relatively large and early-developing glomeruli that are situated dorsolaterally in the female AL appear to be female-specific. Development of the sexually dimorphic glomeruli diverges immediately after the ingrowth of the first olfactory receptor axons, resulting in the formation of these large glomeruli in females and the MGC in males.

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Postembryonic development of the antennal lobes in Periplaneta americana L.

Cited by 53 publications

References 18 publications

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

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

Influence of receptor axons on the formation of olfactory glomeruli in a hemimetabolous insect, the cockroachPeriplaneta americana

Early formation of sexually dimorphic glomeruli in the developing olfactory lobe of the brain of the mothManduca sexta

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