Crustacean red pigment-concentrating hormone Panbo-RPCH affects lipid mobilization and walking activity in a flightless bug Pyrrhocoris apterus (Heteroptera) similarly to its own AKH-peptides

Socha, Radomı́r; Kodrı́k, Dalibor; Zemek, Rostislav

doi:10.14411/eje.2007.086

Cited by 4 publications

(2 citation statements)

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“…Panbo‐RPCH has primarily chromatophorotropic activity in decapod crustaceans (Fernlund & Josefsson, 1972; Gäde & Marco, 2006) and AKHs play a crucial role in insect energy metabolism, yet there may be a unifying neuromodulatory action of the neuropeptides that spans both arthropod groups (Gäde et al , 2003b): Panbo‐RPCH has a neuromodulatory effect in crab and in lobster, and similar effects are recorded for AKHs in various insects (Nässel, 2002). Injection of Panbo‐RPCH into P. apterus not only mobilizes lipids from the fat body, but also stimulates walking activity (Socha et al , 2007) to the same extent as the endogenous AKH peptides of P. apterus (Kodrík et al , 2000, 2002). Although it is well known that AKHs are truly multifunctional and have pleiotropic tasks in insects, the situation with respect to RPCH in crustaceans is not so clear (apart from a few neuromodulatory studies).…”

Section: Discussionmentioning

confidence: 99%

The adipokinetic hormones of Heteroptera: a comparative study

Kodrı́k

Marco

Šimek

et al. 2010

Physiological Entomology

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The adipokinetic hormones (AKHs) from 15 species of heteropteran Hemiptera (encompassing eight families, six superfamilies and three infraorders) have been isolated and structurally identified using liquid chromatography coupled with mass spectrometry. None of the structures are novel and all are octapeptides. These peptide sequence data are used, together with the previously available AKH sequence data on Heteroptera, to create a larger dataset for comparative analyses. This results, in total, in AKH sequences from 30 species (spanning 13 families), which are used in a matrix confronted with the current hypotheses on the phylogeny of Heteroptera. The expanded dataset shows that all heteropterans have octapeptide AKHs; three species have two AKHs, whereas the overwhelming majority have only one AKH. From a total of 11 different AKH peptides known from Heteroptera to date, three AKHs occur frequently: Panbo‐red pigment‐concentrating hormone (RPCH) (×10), Schgr‐AKH‐II (×6) and Anaim‐AKH (×4). The heteropteran database also suggests that particular AKH variants are family‐specific. The AKHs of Heteroptera: Pentatomomorpha (all terrestrial) are not present in Nepomorpha (aquatic) and Gerromorpha: Gerridae (semiaquatic); AKHs with a Val in position 2 are absent in the Pentatomomorpha (only AKHs with Leu2 are present), whereas Val2 predominates in the nonterrestrial species. An unexpected diversity of AKH sequences is found in Nepomorpha, Nepoidea, Nepidae and Nepinae, whereas Panbo‐RPCH (which has been identified in all infraorders of decapod crustaceans) is present in all analysed species of Pentatomidae and also in the only species of Tessaratomidae investigated. The molecular evolution of Heteroptera with respect to other insect groups and to crustaceans is discussed

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Section: Discussionmentioning

confidence: 99%

The adipokinetic hormones of Heteroptera: a comparative study

Kodrı́k

Marco

Šimek

et al. 2010

Physiological Entomology

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“…RPCH plays multifunctional roles in crustaceans, regulating lipid and carbohydrate mobilization ( 97 , 98 ), mediating circadian ( 39 , 89 ), and swimmeret rhythms ( 99 ), modulating the stomatogastric nervous system in crustaceans ( 100 ) and stimulating MF production from the mandibular organs ( 101 ). Increased glucose levels could be elicited in the hemolymph of the isopod Porcellio scaber injected with synthetic RPCH, suggesting a novel role for this neuropeptide in carbohydrate mobilization by causing the release of crustacean hyperglycemic hormone (CHH) ( 102 ).…”

Section: Red Pigment-concentrating Hormone (Rpch)mentioning

confidence: 99%

Insights on Molecular Mechanisms of Ovarian Development in Decapod Crustacea: Focus on Vitellogenesis-Stimulating Factors and Pathways

2020

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Vitellogenesis in crustaceans is an energy-consuming process. Though the underlying mechanisms of ovarian maturation in decapod Crustacea are still unclear, evidence indicates the process to be regulated by antagonistically-acting inhibitory and stimulating factors specifically originating from X-organ/sinus gland (XO/SG) complex. Among the reported neuromediators, neuropeptides belonging to the crustacean hyperglycemic hormone (CHH)-family have been studied extensively. The structure and dynamics of inhibitory action of vitellogenesis-inhibiting hormone (VIH) on vitellogenesis have been demonstrated in several species. Similarly, the stimulatory effects of other neuropeptides of the CHH-family on crustacean vitellogenesis have also been validated. Advancement in transcriptomic sequencing and comparative genome analysis has led to the discovery of a large number of neuromediators, peptides, and putative peptide receptors having pleiotropic and novel functions in decapod reproduction. Furthermore, differing research strategies have indicated that neurotransmitters and steroid hormones play an integrative role by stimulating neuropeptide secretion, thus demonstrating the complex intertwining of regulatory factors in reproduction. However, the molecular mechanisms by which the combinatorial effect of eyestalk hormones, neuromediators and other factors coordinate to regulate ovarian maturation remain elusive. These multifunctional substances are speculated to control ovarian maturation possibly via the autocrine/paracrine pathway by acting directly on the gonads or by indirectly exerting their stimulatory effects by triggering the release of a putative gonad stimulating factor from the thoracic ganglion. Acting through receptors, they possibly affect levels of cyclic nucleotides (cAMP and cGMP) and Ca 2+ in target tissues leading to the regulation of vitellogenesis. The “stimulatory paradox” effect of eyestalk ablation on ovarian maturation continues to be exploited in commercial aquaculture operations, and is outweighed by the detrimental physiological effects of this procedure. In this regard, the development of efficient alternatives to eyestalk ablation based on scientific knowledge is a necessity. In this article, we focus principally on the signaling pathways of positive neuromediators and other factors regulating crustacean reproduction, providing an overview of their proposed receptor-mediated stimulatory mechanisms, intracellular signaling, and probable interaction with other hormonal signals. Finally, we provide insight into future research directions on crustacean reproduction as well as potential applications of such research to aquaculture technology development.

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