title: Functional studies of crustacean hyperglycemic hormones (CHHs) of the blue crab, Callinectes sapidus - the expression and release of CHH in eyestalk and pericardial organ in response to environmental stress.
abstract: The rapid increase in the number of putative cDNA sequences encoding crustacean hyperglycemic hormone (CHH) family in various tissues [either from the eyestalk (ES) or elsewhere] underscores a need to identify the corresponding neuropeptides in relevant tissues. Moreover, the presence of provided structural CHH implies the level of the complexity of physiological regulation in crustaceans. Much less is known of the functions of non-ES CHH than of those of its counterpart present in ESs. In the blue crab, Callinectes sapidus, we know little of CHH involvement in response to the stressful conditions that naturally occur in Chesapeake Bay. We have identified two isoforms of CHH neuropeptide in the sinus gland of the ES and isolated a full-length cDNA encoding CHH from the pericardial organ (PO). The functions of ES-CHH and PO-CHH in this species were studied with regard to expression and release in response to stressful episodes: hypoxia, emersion, and temperatures. Animals exposed to hypoxic conditions responded with concomitant release of both CHHs. In contrast, the mRNA transcripts encoding two CHHs were differentially regulated: PO-CHH increased, whereas ES-CHH decreased. This result suggests a possible differential regulation of transcription of these CHHs.
authors.affiliation: Center of Marine Biotechnology, University of Maryland Biotechnology Institute, Baltimore, USA. chung@comb.umbi.umd.edu
authors.forename: J Sook
authors.initials: JS
authors.lastname: Chung
authors.forename: N
authors.initials: N
authors.lastname: Zmora
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D060829:Arthropod Proteins; D001483:Base Sequence; D003386:Brachyura / Q000235:genetics / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D005123:Eye / Q000378:metabolism; D020869:Gene Expression Profiling; D005947:Glucose / Q000378:metabolism; D007150:Immunohistochemistry; D007447:Invertebrate Hormones; D019344:Lactic Acid / Q000378:metabolism; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D010496:Pericardium / Q000378:metabolism; D020033:Protein Isoforms / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D021241:Spectrometry, Mass, Electrospray Ionization; D013696:Temperature
chemical_list: D060829:Arthropod Proteins; D018076:DNA, Complementary; D007447:Invertebrate Hormones; D009419:Nerve Tissue Proteins; D020033:Protein Isoforms; C015947:hyperglycemic hormone, crustacean; D019344:Lactic Acid; D005947:Glucose