Physiology and morphology of descending neurons in pheromone-processing olfactory pathways in the male moth Manduca sexta

Kanzaki, Ryohei; Arbas, Edmund A.; Hildebrand, John G.

doi:10.1007/bf00198168

Cited by 80 publications

(56 citation statements)

References 32 publications

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“…Descending interneurons, carrying information from the brain to the thoracic ganglion, have also been shown to dendritically innervate the LAL area (19,20). In this study, bilaterally projecting interneurons with dendritic arborizations in the AL and axonal branches in the LAL and the ILPR were found.…”

Section: Discussionsupporting

confidence: 51%

Discrimination among pheromone component blends by interneurons in male antennal lobes of two populations of the turnip moth, Agrotis segetum.

Anton

Löfstedt

et al. 1996

Proc. Natl. Acad. Sci. U.S.A.

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A difference in female pheromone production and male behavioral response has previously been found in two populations of the turnip moth, Agrotis segetum, originating from Sweden and Zimbabwe, respectively. In this study, we investigated the pheromone response of antennal lobe interneurons of males of the two populations by intracellular recordings, stimulating with single pheromone components and various inter-and intra-populational pheromone blends. Three major physiological types of antennal lobe neurons were established in the two populations according to their responses to different stimuli. One type responded broadly to almost all the stimuli tested. The second type responded selectively to some of the single components and blends. The third type did not respond to any single components but did respond to certain blends. Furthermore, some neurons of the second and third type recognized strain specific differences in ratios between pheromone components. Both projection neurons and local interneurons were found among these three types. Two pheromone responding bilateral projection neurons are reported for the first time in this paper.

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Section: Discussionsupporting

confidence: 51%

Discrimination among pheromone component blends by interneurons in male antennal lobes of two populations of the turnip moth, Agrotis segetum.

Anton

Löfstedt

et al. 1996

Proc. Natl. Acad. Sci. U.S.A.

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“…Our results suggest that the neuronal responses to pheromone are modulated by serotonin in the ALs and transferred via higher information processing centers in the protocerebrum to descending neurons related to the pheromone-searching behavior (Kanzaki et al, 1991(Kanzaki et al, , 1994.…”

Section: Serotonin Modulates Sensitivity To Bombykolmentioning

confidence: 79%

Serotonin modifies the sensitivity of the male silkmoth to pheromone

Gatellier

Nagao

Kanzaki

2004

Journal of Experimental Biology

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Serotonin is known to modulate the response of neuronal populations in the primary olfactory center of the moth olfactory system, the antennal lobe. Here, we analyzed the effects of serotonin on the behavior related to the restricted pheromone olfactory pathway of the male silkmoth, Bombyx mori. In order to understand the effects of serotonin at the behavioral level, we applied serotonin (10 -5 ·mol·l -1 , 10 -4 ·mol·l -1 and 10 -3 ·mol·l -1 ) to the brain and found that 10 -4 ·mol·l -1 serotonin increases the sensitivity to female pheromone whereas 10 -3 ·mol·l -1 serotonin had the opposite effect. Levels of serotonin in the brain were determined using HPLC with electrochemical detection. Inhibitory effects were observed after applying the serotonin antagonists mianserin (10 -4 ·mol·l -1 ) and ketanserin (10 -3 ·mol·l -1 ). Additionally, we quantified the circadian variation of serotonin in the brain using HPLC with electrochemical detection. Further, this variation correlated well with a circadian variation of the male sensitivity to pheromone. These results show that the serotonin-related enhancement of neuronal responses at the antennal lobe level is expressed at the behavioral level as a modulation of pheromone sensitivity and that the circadian variation of serotonin levels in the brain correlates with changes in the moth's pheromone sensitivity.

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“…The relevance of the LALs for insect motor activity has been described in connection with visual control of flight behavior in locusts (Homberg 1994) and the control of pheromone-guided flight in moths (Kanzaki and Shibuya 1986;Kanzaki et al 1991). Additionally, Böhm and Schildberger (1992) described a descending brain neuron in crickets with extensive dendritic arborizations in the LAL area, which was directly involved in control of walking.…”

Section: Discussionmentioning

confidence: 99%

Processing of species-specific auditory patterns in the cricket brain by ascending, local, and descending neurons during standing and walking

Zorović

Hedwig

2011

Journal of Neurophysiology

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Zorović M, Hedwig B. Processing of species-specific auditory patterns in the cricket brain by ascending, local, and descending neurons during standing and walking. J Neurophysiol 105: 2181-2194, 2011. First published February 23, 2011 doi:10.1152/jn.00416.2010.-The recognition of the male calling song is essential for phonotaxis in female crickets. We investigated the responses toward different models of song patterns by ascending, local, and descending neurons in the brain of standing and walking crickets. We describe results for two ascending, three local, and two descending interneurons. Characteristic dendritic and axonal arborizations of the local and descending neurons indicate a flow of auditory information from the ascending interneurons toward the lateral accessory lobes and point toward the relevance of this brain region for cricket phonotaxis. Two aspects of auditory processing were studied: the tuning of interneuron activity to pulse repetition rate and the precision of pattern copying. Whereas ascending neurons exhibited weak, low-pass properties, local neurons showed both low-and band-pass properties, and descending neurons represented clear band-pass filters. Accurate copying of single pulses was found at all three levels of the auditory pathway. Animals were walking on a trackball, which allowed an assessment of the effect that walking has on auditory processing. During walking, all neurons were additionally activated, and in most neurons, the spike rate was correlated to walking velocity. The number of spikes elicited by a chirp increased with walking only in ascending neurons, whereas the peak instantaneous spike rate of the auditory responses increased on all levels of the processing pathway. Extra spiking activity resulted in a somewhat degraded copying of the pulse pattern in most neurons.

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Physiology and morphology of descending neurons in pheromone-processing olfactory pathways in the male moth Manduca sexta

Cited by 80 publications

References 32 publications

Discrimination among pheromone component blends by interneurons in male antennal lobes of two populations of the turnip moth, Agrotis segetum.

Discrimination among pheromone component blends by interneurons in male antennal lobes of two populations of the turnip moth, Agrotis segetum.

Serotonin modifies the sensitivity of the male silkmoth to pheromone

Processing of species-specific auditory patterns in the cricket brain by ascending, local, and descending neurons during standing and walking

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