The effects of serotonin, dopamine, gonadotropin-releasing hormones, and corazonin, on the androgenic gland of the giant freshwater prawn, Macrobrachium rosenbergii

Transcriptomic characterization and curation of candidate neuropeptides regulating reproduction in the eyestalk ganglia of the Australian crayfish, Cherax quadricarinatus

“…A number of neuropeptides genes detected in the current study are very similar to those identified in other in silico studies that have investigated related crustacean or insect species. Confirmation of neuropeptide genes in a diverse range of species is important since several arthropod neuropeptides have an unknown function, while others have a function that has only been partially confirmed or appear to have ambiguous roles27282930. A similar recent in silico analysis approach in M. rosenbergii central nervous system yielded 21 neuropeptide transcripts (with some having multiple isoforms) that encode up to 102 mature peptides6.…”

“…Still, it is important to note that in spite of the known function of some members in the CHH superfamily, their identity and functionality is vastly uncharacterised13. Lastly, there are numerous neuropeptides that have previously been demonstrated to have other functions (for example, cardio-activity, osmoregulation, pigmentation, stress response) but then later were assigned novel roles in reproduction and/or sexual development27282930. These findings highlight that while our understanding of the molecular mechanisms of neuropeptides involved in crustacean reproduction processes is quite advanced, it is yet still far from being complete.…”

Distribution of serotonin and dopamine in the central nervous system of the female mud crab, Scylla olivacea (Herbst)

“…In male P. clarkii, U. pugilator, and M. rosenbergii, administration of DA causes a smaller testicular-somatic index, smaller testicular lobes, fewer mature sperm, less-well-developed androgenic gland and decreased spermatogenic cell proliferation. (Sarojini et al, 1995a,b;Poljaroen et al, 2011, Siangcham et al, 2013.…”

Knockdown of the corazonin gene reveals its critical role in the control of gregarious characteristics in the desert locust

“…This peptide was shown to be involved in the initiation of ecdysis behaviors in the moth, Manduca sexta, (Kim et al, 2004). In the prawn, Macrobrachium rosenbergii, Crz affected testicular development, spermatogenesis, and androgenic gland size (Siangcham et al, 2013). In contrast, the Crz signaling pathway is considered to be absent in coleopteran insects because the peptide and its coding gene were not found and its biological activity and immunoreactivity were undetectable in any of the species examined (Tanaka, 2000a(Tanaka, , 2006Roller et al, 2003;Gäde et al, 2008;Li et al, 2008).…”