有哪些信誉好的足球投注网站crf-like diuretic hormone negatively affects both feeding and reproduction in the desert locust, schistocerca gregariacrf-like利尿激素喂养和繁殖产生不利影响的沙漠蝗虫,schistocerca gregaria.pdfVIP
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crf-like diuretic hormone negatively affects both feeding and reproduction in the desert locust, schistocerca gregariacrf-like利尿激素喂养和繁殖产生不利影响的沙漠蝗虫,schistocerca gregaria
CRF-Like Diuretic Hormone Negatively Affects Both Feeding and Reproduction in the Desert Locust, Schistocerca gregaria Pieter Van Wielendaele, Senne Dillen, Elisabeth Marchal, Liesbeth Badisco, Jozef Vanden Broeck* Molecular Developmental Physiology and Signal Transduction, Division of Animal Physiology and Neurobiology, Zoological Institute, K.U. Leuven, Leuven, Belgium Abstract Diuretic hormones (DH) related to the vertebrate Corticotropin Releasing Factor (CRF) have been identified in diverse insect species. In the migratory locust, Locusta migratoria, the CRF-like DH (CRF/DH) is localized in the same neurosecretory cells as the Ovary Maturating Parsin (OMP), a neurohormone that stimulates oocyte growth, vitellogenesis and hemolymph ecdysteroid levels in adult female locusts. In this study, we investigated whether CRF-like DH can influence feeding and reproduction in the desert locust, Schistocerca gregaria. We identified two highly similar S. gregaria CRF-like DH precursor cDNAs, each of which also encodes an OMP isoform. Alignment with other insect CRF-like DH precursors shows relatively high conservation of the CRF/DH sequence while the precursor region corresponding to OMP is not well conserved. Quantitative real-time RT-PCR revealed that the precursor transcripts mainly occur in the central nervous system and their highest expression level was observed in the brain. Injection of locust CRF/DH caused a significantly reduced food intake, while RNAi knockdown stimulated food intake. Therefore, our data indicate that CRF-like DH induces satiety. Furthermore, injection of CRF/DH in adult females retarded oocyte growth and caused lower ecdysteroid titers in hemolymph and ovaries, while RNAi knockdown resulted in opposite effects. The observed effects of CRF/DH may be part of a wider r
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