Developmental expression of FXPRLamide neuropeptides in peptidergic neurosecretory cells of diapause- and nondiapause-destined individuals of the cotton bollworm, Helicoverpa armigera

Sun, Jiusong; Zhang, Tianyi; Zhu, Zhongliang; Zhang, Hongmin; Teng, Maikun; Niu, Liwen; Xu, Wei‐Hua

doi:10.1016/j.ygcen.2004.11.015

Cited by 25 publications

(15 citation statements)

References 29 publications

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“…Immunoreactivity of the two pairs of cells is clear in both diapause-and nondiapause-destined larvae. Sun et al [13,15,16] investigated the difference of DH expression at embryonic, larval, and pupal stages in H. armigera and B. mori using whole-mount immunocytochemistry, and the staining intensity of positive neuron and their axons reflected the state of DH biosynthesis and secretion. Likewise, developmental changes of PTTH from A. pernyi also were measured by whole-mount immunocytochemistry, and showed that the staining in positive cells and axon are a symbol of biosynthesis and secretion [3] .…”

Section: Discussionmentioning

confidence: 99%

Synthesis dynamic and developmental profile of prothoracicotropic hormone between diapause- and nondiapause-destined individuals in Helicoverpa armigera

Hou

2007

CHINESE SCI BULL

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Biosynthesis and secretion of prothoracicotropic hormone (PTTH) of diapause-and nondiapausedestined individuals inHelicoverpa armigera were studied using whole-mount immunocytochemistry and enzyme-linked immunosorbent assay (ELISA). The immunocytochemistry revealed that PTTH is expressed in two pairs of lateral neurosecretory cells of the brain. The presence of immunoreactivity has not significant difference between the brains of the diapause-and nondiapause-destined 6th instar larvae. However, the obvious differences of expressional pattern from day 4 pupae were observed between the two types. PTTH titers in hemolymph from the 6th instar larvae to pharate adults were measured by the ELISA. Although there were similar titer changes between the two types of individuals at the larval stage, a significant difference from developmental expression was detected at the pupal stage, suggesting that the expression and secretion of PTTH does play a crucial role in regulation of pupal diapause of H. armigera.prothoracicotropic hormone, whole-mount immunocytochemistry, enzyme-linked immunosorbent assay, Helicoverpa armigera

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Section: Discussionmentioning

confidence: 99%

Synthesis dynamic and developmental profile of prothoracicotropic hormone between diapause- and nondiapause-destined individuals in Helicoverpa armigera

Hou

2007

CHINESE SCI BULL

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“…Among the FXPRLamides, PBAN is released every night with a precise diurnal rhythm (Ichikawa et al 1996) but the control of this periodicity has not been examined. PBAN is derived from a common precursor together with the diapause hormone (DH), which induces embryonic diapause in B. mori (Yamashita and Hasegawa 1985) and regulates pupal diapause in Helicoverpa armigera (Sun et al 2005). DH production is determined by the photoperiod.…”

Section: Discussionmentioning

confidence: 99%

Neurohormones as putative circadian clock output signals in the central nervous system of two cricket species

et al. 2006

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Antisera to the neuropeptides corazonin (Crz) and crustacean cardioactive peptide (CCAP) and to the diapause hormone (DH) react with small sets of neurones in the cephalic ganglia of the crickets Dianemobius nigrofasciatus and Allonemobius allardi. The distribution of their immunoreactivities is similar in the two species and overlaps with the locations of presumed circadian clock components in the optic lobes, protocerebrum, tritocerebrum, suboesophageal ganglion (SOG) and frontal ganglion. D. nigrofasciatus contains two Crz-immunoreactive (Crz-ir) cells in each optic lobe, six cell groups in the protocerebrum, four in the tritocerebrum, and one in SOG, whereas A. allardi harbours only five Crz-ir groups in the protocerebrum and four in the tritocerebrum. CCAP immunoreactivity occurs in both species in four protocerebrum cell clusters, four tritocerebrum cell clusters, four SOG cell clusters, one frontal ganglion cell cluster, and two optic lobe cell clusters; D. nigrofasciatus possesses two additional cells with unique links to the lamina in the optic lobe. DH-related antigens are present in four cell clusters in the optic lobe, six (D. nigrofasciatus) or eight (A. allardi) in the protocerebrum, four in the tritocerebrum, and three (A. allardi) or five (D. nigrofasciatus) in the SOG. Some of the detected cells also react with antibody to the clock protein Period (PER) or lie close to PER-ir cells. Crickets reared at two different photoperiods do not differ in the distribution and intensity of immunoreactivities. No changes have been detected during the course of diurnal light/dark cycles, possibly because the antisera react with persistent prohormones, whereas circadian fluctuations may occur at the level of their processing or of hormone release. The projection of immunoreactive fibres to several brain regions, the stomatogastric nervous system and the neurohaemal organs indicates multiple functions of the respective hormones.

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“…When synthetic FXPRL-neuropeptides are injected into non-diapause fated larvae, they delay development, and as a consequence increase the time dedicated to the storage of energy for pupal diapause [109]. Similarly, in the silkworm, individuals that are programmed to lay diapausing eggs, prolong the feeding period during the larval stage in relation to enhanced levels of DH-PBAN gene expression [110].…”

Section: Pupal Diapausementioning

confidence: 99%

The hormonal and circadian basis for insect photoperiodic timing

2011

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Edited by Martha Merrow and Michael BrunnerKeywords: Insects Photoperiodism Diapause Endocrine axis Circadian clock Clock genes a b s t r a c t Daylength perception in temperate zones is a critical feature of insect life histories, and leads to developmental changes for resisting unfavourable seasons. The role of the neuroendocrine axis in the photoperiodic response of insects is discussed in relation to the key organs and molecules that are involved. We also discuss the controversial issue of the possible involvement of the circadian clock in photoperiodicity. Drosophila melanogaster has a shallow photoperiodic response that leads to reproductive arrest in adults, yet the unrivalled molecular genetic toolkit available for this model insect should allow the systematic molecular and neurobiological dissection of this complex phenotype.

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Developmental expression of FXPRLamide neuropeptides in peptidergic neurosecretory cells of diapause- and nondiapause-destined individuals of the cotton bollworm, Helicoverpa armigera

Cited by 25 publications

References 29 publications

Synthesis dynamic and developmental profile of prothoracicotropic hormone between diapause- and nondiapause-destined individuals in Helicoverpa armigera

Synthesis dynamic and developmental profile of prothoracicotropic hormone between diapause- and nondiapause-destined individuals in Helicoverpa armigera

Neurohormones as putative circadian clock output signals in the central nervous system of two cricket species

The hormonal and circadian basis for insect photoperiodic timing

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