Neurohormonal Integration of Osmotic and Ionic Regulation

The response of digestive enzyme activity in the mature Chinese mitten crab, <i>Eriocheir sinensis</i> (Decapoda: Brachyura), to gradual increase of salinity

“…Several studies (Mantel 1985, Kamemoto 1991, Morris 2001, Fanjul-Moles 2006 have also pointed out that neuroendocrine hormones are involved in the osmoregulation of crustaceans. However, no reports have directly connected neurohormone with digestive enzyme activity under the osmotic environment.…”

Putative involvement of crustacean hyperglycemic hormone isoforms in the neuroendocrine mediation of osmoregulation in the crayfishAstacus leptodactylus

“…In decapod crustaceans, eyestalk ablation is known to affect water metabolism, which leads to an increase in water content after a molt (Muramoto, 1988). The effects of eyestalk ablation are generally compensated for by the injection of eyestalk or SG extracts (reviewed by Kamemoto, 1976Kamemoto, , 1991Mantel and Farmer, 1983;Mantel, 1985;Muramoto, 1988). The results of these previous studies suggested the presence of a neuroendocrine factor(s) in the eyestalk that can influence osmoregulatory processes.…”

“…The presence of active factors has been suggested in neuroendocrine centers located in the eyestalks, the pericardial organs, the cerebroid ganglia, the thoracic ganglionic mass and the ventral nervous system (reviewed by Kamemoto, 1976Kamemoto, , 1991Kleinholz, 1976;Mantel, 1985;Muramoto, 1988;Morris, 2001). Generally, eyestalk ablation or ligation performed on crustaceans acclimated to dilute media results in a decrease in hemolymph osmolality, ion content and ionic (Na + and Cl -) influx and an increase in water content (reviewed by Kamemoto, 1976;Charmantier et al, 1984;Mantel, 1985;Muramoto, 1988). Implantation of eyestalk tissue or injection of eyestalk extracts restores or enhances ionic and osmotic regulation in eyestalkless crustaceans (Kamemoto, 1976;Charmantier et al, 1984;Mantel, 1985;Charmantier-Daures et al, 1988;Freire and McNamara, 1992).…”

“…Generally, eyestalk ablation or ligation performed on crustaceans acclimated to dilute media results in a decrease in hemolymph osmolality, ion content and ionic (Na + and Cl -) influx and an increase in water content (reviewed by Kamemoto, 1976;Charmantier et al, 1984;Mantel, 1985;Muramoto, 1988). Implantation of eyestalk tissue or injection of eyestalk extracts restores or enhances ionic and osmotic regulation in eyestalkless crustaceans (Kamemoto, 1976;Charmantier et al, 1984;Mantel, 1985;Charmantier-Daures et al, 1988;Freire and McNamara, 1992). These results have suggested the involvement of an eyestalk neuroendocrine factor(s) in the control of osmoregulatory processes.…”

Dopaminergic regulation of ion transport in gills of the euryhaline semiterrestrial crabChasmagnathus granulatus: interaction between D1- and D2-like receptors

“…Active ion absorption through the posterior gills of euryhaline crabs is regulated by bioamines and peptidic factors secreted by neuroendocrine organs such as pericardial organs (PO), thoracic ganglion (ThG) and sinus glands (Eckhardt et al, 1995;Kamemoto and Oyama, 1985;Mantel, 1985;Onken et al, 2000;Spanings-Pierrot et al, 2000;among others). In early works, PO extract, dopamine (DA), serotonin, octopamine and hemolymph from seawater acclimated crabs have been injected into whole animals or tested in isolated perfused gills of the blue crab Callinectes sapidus and the Chinese crab Eriocheir sinensis, resulting in increased Na + influx and intracellular cyclic adenosine 3Ј-5Ј monophospate (cAMP) content (Kamemoto, and Oyama, 1985;Lohrmann and Kamemoto, 1987;Sommer and Mantel, 1988;Sommer and Mantel, 1991;Bianchini and Gilles, 1990).…”