Abstract：
:The tilapia prolactin (PRL) cell responds rapidly (10-20 min) to small physiological changes in medium osmotic pressure (OP), releasing increasing quantities of hormone as medium OP is reduced. This release is rapidly (≤ 10 min) inhibited by somatostatin (SRIF). There is now extensive evidence that tilapia PRL cell function is regulated through the second messengers Ca(++) and cAMP. Our studies have shown that PRL release is augmented by treatments that lead to increased levels of intracellular Ca(++) or cAMP. On the other hand, PRL release is blocked when tissues are incubated in Ca(++)-depleted medium or upon the addition of Co(++), an inhibitor of Ca(++)-mediated processes. The use of(45)Ca(++) to characterize the movement of Ca(++) into PRL cells has provided evidence that an increase in the influx of extracellular Ca(++) may participate in PRL release upon exposure to hyposmotic medium. Our studies have also shown that SRIF suppresses the increase in(45)Ca(++) accumulation that is brought about when OP is reduced. We have also examined the effects of OP and SRIF on cAMP levels. The reduction of medium OP did not alter cAMP metabolism during 20 min of incubation. By contrast, cAMP accumulation in the presence of IBMX was enhanced at 1 hr of incubation in reduced OP. Thus, an increase in cAMP turnover may play a role in maintaining PRL release under sustained stimulation. SRIF reduced the accumulation of cAMP during 10 min of incubation with IBMX and also reduced the forskolin-stimulated increase in cAMP. Thus, SRIF may suppress adenylate cyclase activity. Finally, our studies have revealed that the forskolin-stimulated increase in cAMP levels is not dependent upon medium Ca(++). The presence of Ca(++) in the medium is required, however, for PRL release even when the cAMP messenger system has been activated. Moreover, cAMP accumulation was augmented when intracellular Ca(++) was increased. This raises the possibility that reduced OP may stimulate an increase in cAMP turnover indirectly through its action(s) on cytosolic Ca(++).
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Grau EG,Helms LMdoi
10.1007/BF00004685subject
Has Abstractpub_date
1989-06-01 00:00:00pages
11-9issue
1-6eissn
0920-1742issn
1573-5168journal_volume
7pub_type
杂志文章abstract：:We have studied the location and the ontogeny of the digestive enzyme, phospholipase A2 (PLA2) immunohistochemically in the adult and larvae/juvenile of the red sea breamPagrus major by using an antiserum against theNaja naja venom PLA2. The antiserum reacts with at least one enzyme among the PLA2s purified from the f...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF02274224
更新日期：1992-02-01 00:00:00
abstract：:Plasma levels of L-thyroxine (T4) and 3,5,3'-triiodo-L-thyronine (T3) and the percentage of plasma T4 and T3 present in the free (dialyzable) form (%FT4 and %FT3) were measured in 16 species (11 families) of tropical marine teleosts from an inshore Barbados reef. Mean plasma T4 varied from 0.2 ng/ml to 42 ng/ml; mean ...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF02180414
更新日期：1987-05-01 00:00:00
abstract：:The objective of the present study was to confirm previous results on the mediation of GnRH signal in tilapia by providing evidence from experiments in cultured pituitary cells and from perifusion experiments using a GnRH-antagonist. After 4 days in culture under identical conditions, cells taken from pituitaries of f...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004550
更新日期：1993-07-01 00:00:00
abstract：:Due to problems with bone deformities in farmed Atlantic salmon, there is a growing interest in the possible involvement of vitamin K in normal bone development, and sensitive biomarkers for evaluating vitamin K status are therefore needed. The vitamin K-dependent (VKD) enzyme gamma-glutamylcarboxylase (GGCX, EC 6.4.x...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-009-9335-5
更新日期：2010-09-01 00:00:00
abstract：:The pharmacokinetic properties of sarafloxacin were investigated after single intravenous (i.v.) and oral (p.o.) administration of 10 mg/kg body weight (b.w.) in allogynogenetic silver crucian carp at 24-26 °C. The plasma concentrations of sarafloxacin were determined by high-performance liquid chromatography. After i...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-015-0141-y
更新日期：2016-02-01 00:00:00
abstract：:A 2 × 2 × 2 factorial experiment was conducted to delineate the main effect of water soaking of plant ingredients, phytase, cellulase, and their interactions on the growth and digestive enzyme activities of Labeo rohita fingerlings. Two basal diets were prepared using water-soaked (S) or unsoaked (US) plant-based ingr...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-011-9511-2
更新日期：2012-04-01 00:00:00
abstract：:The aims of the present study are to determine whether triiodothyronine (T3) and/or thyroxine (T4) in tilapia larvae is gifted through the mother, and to investigate the change profiles of thyrotropin (TSH), thyroid follicular cells and type I deiodinase (D1) gene expression following larval development. T3 and T4 con...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-014-9950-7
更新日期：2014-10-01 00:00:00
abstract：:Levels of reproductively-related steroids were determined in captive male sand tiger sharks, Carcharias taurus, maintained at two institutions: SeaWorld Adventure Park Orlando and the National Aquarium in Baltimore. Sexual conflicts were absent at the former, but were documented at the latter. Serum titers of 17beta-e...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-008-9202-9
更新日期：2008-12-01 00:00:00
abstract：:River damming and building of hydroelectric power plants interrupt the reproductive migration routes and change the major physicochemical parameters of water quality, with drastic consequences for populations of migratory fishes. The goal of this study was to evaluate proliferation and cell death during spermatogenesi...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-012-9668-3
更新日期：2012-12-01 00:00:00
abstract：:Serum thyroid hormone concentrations were measured during the seven stages of metamorphosis (1-7) of the southern hemisphere lamprey, Geotria australis. The respective mean concentrations ± SEM of serum thyroxine (T4) and triiodothyronine (T3) fell from 31.73 ± 4.09 and 5.06 ± 0.70 nM in large ammocoetes sampled in Fe...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004444
更新日期：1990-03-01 00:00:00
abstract：:The present study aimed to assess the sewage effects of the Brazilian Antarctic Station Comandante Ferraz, Admiralty Bay, King George Island, on the hepatic metabolism (energetic, antioxidant, and arginase levels) and levels of plasma constituents of two Antarctic fish species Notothenia rossii and N. coriiceps. The b...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-015-0080-7
更新日期：2015-10-01 00:00:00
abstract：:This study aimed to characterize the full-length cDNA of glucose-6-phosphate dehydrogenase (G6PD) from Megalobrama amblycephala with its responses to dietary carbohydrate levels characterized. The cDNA obtained covered 2768 bp with an open reading frame of 1572 bp. Sequence alignment and phylogenetic analysis revealed...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-018-0572-3
更新日期：2019-02-01 00:00:00
abstract：:Drinking in freshwater juvenile salmon was investigated in response to vasodilation by sodium nitroprusside (SNP), a nitric oxide donor, which significantly increased blood vessel diameter in Atlantic salmon alevins. Atlantic salmon fry (1-3 g), as previously shown, drank at a significant rate in fresh water which dou...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF01874839
更新日期：1996-02-01 00:00:00
abstract：:The Brazilian freshwater fish diversity is the richest in the world. Only 0.7% of all Brazilian species have had any aspect of their sperm biology addressed up to this date. The majority of the fish species described in this review migrate during the spawning season (a phenomenon known as piracema). Urbanization, poll...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章,评审
doi：10.1007/s10695-008-9240-3
更新日期：2009-03-01 00:00:00
abstract：:The present study aims to investigate the effects of both garlic and curcumin through evaluating their therapeutic properties as antioxidants on liver and kidney functions, hepatic antioxidants and GPx gene expression against aflatoxicosis of O. niloticus. In total, 180 of tilapia were divided into ten groups; T1 repr...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-015-0164-4
更新日期：2016-04-01 00:00:00
abstract：:In teleosts, cortisol is one of the key factors regulating the adaptation to environmental challenges, such as salinity changes. This paper compares interrenal function between fully adapted freshwater (FW) and sea water (SW) specimens of the euryhaline teleost Oreochromis mossambicus (tilapia), combining morphometric...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004289
更新日期：1995-02-01 00:00:00
abstract：:The effects of chronic and periodic peaks of un-ionised ammonia (UIA-N) exposure on eye health and cataract formation in juvenile Atlantic halibut, Hippoglossus hippoglossus, were examined. Fish with mean initial weight 51.7 g (SD 13.2) were exposed to five treatments consisting of control group and three groups (Chro...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-011-9521-0
更新日期：2012-04-01 00:00:00
abstract：:Due to rapid depletion of wild stocks, the necessity to cultivate fish is eminent. Current fish farming practices seek to improve flesh quality. The notion that white muscles are the main target of the fishing industry is emphasized. A novel approach is suggested based on the development of white muscles in wild fish ...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-011-9501-4
更新日期：2011-06-01 00:00:00
abstract：:Fish red blood cells (RBCs) exhibit an oxygen-dependent regulatory volume decrease (RVD) in hypoosmotic environment. In higher vertebrates, membrane-associated hemoglobin is involved in the regulation of osmotic ion movements across the cellular membrane. However, whether the hemoglobin conformational state plays a ro...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-019-00689-4
更新日期：2019-12-01 00:00:00
abstract：:European catfish (Silurus glanis) is a commercially important freshwater fish originating from Eastern Europe. The objective of this study was to examine the short-term storage of its eggs especially in relation to maintaining a low level of malformation in newly hatched fry. The eggs from freshly spawned individuals ...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-020-00902-9
更新日期：2020-11-26 00:00:00
abstract：:The regulation of the interrenal of teleostean fishes is reviewed from the perspective of non-classical control mechanisms and new evidence is presented suggesting gonadotropic control of the interrenal. Cortisol secretion by the interrenal, in addition to regulation by ACTH, appears to be mediated by other hormones. ...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004715
更新日期：1989-06-01 00:00:00
abstract：:Studies on the digestive secretions in aquatic animals can elucidate certain aspects of their nutritive physiology. The aim of the present study was to compare the digestive lipase and phospholipase activities in ten marine species belonging to four classes following the taxonomic classification of marine organisms. A...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-012-9633-1
更新日期：2012-10-01 00:00:00
abstract：:This investigation was performed to monitor hexachlorocyclohexane isomers (HCHs), dichlorodiphenyltrichloroethane (DDT, and its metabolites, refered to as DDTs), plasma levels of estradiol-17beta (E2), and the gonadosomatic index (GSI) between sampling sites of unpolluted ponds of Gujartal, Jaunpur (control site) and ...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-007-9142-9
更新日期：2008-03-01 00:00:00
abstract：:In the present study, three cDNAs of AdipoRs (MpAdipoR1a, MpAdipoR1b, and MpAdipoR2) were identified from juvenile black carp Mylopharyngodon piceus. There were 375, 378, and 356 amino acids in the MpAdipoR1a, MpAdipoR1b, and MpAdipoR2, respectively. BLAST analysis reveals that MpAdipoRs share high identities with oth...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-018-0501-5
更新日期：2018-08-01 00:00:00
abstract：:Whole animal transepithelial potentials (TEP) of yearling coho salmon (Oncorhynchus kisutch) in fresh water and after transfer to seawater were recorded throughout parr-smolt transformation (smoltification) from February to August 1984, along with plasma Na(+) and Cl(-) concentrations and osmolality. Based on plasma i...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF02183991
更新日期：1987-01-01 00:00:00
abstract：:In addition to catalytical assays, immunochemical techniques have recently been employed to measure induction of the cytochrome P-450 (P450) monooxygenase system in fish with polyaromatic hydrocarbons (PAH). In the present study, polyclonal antibodies were raised against rainbow trout P450IA1. Levels of rainbow trout ...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF02265140
更新日期：1991-06-01 00:00:00
abstract：:The present study investigates the nephrotoxic effects of two acute doses of silver nanoparticles (AgNPs) and silver nitrate (AgNO3) on the African catfish, Clarias gariepinus, using biochemical, histochemical, and histopathological changes as biomarkers. AgNP-induced impacts were recorded in some of these characteris...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-019-00686-7
更新日期：2019-12-01 00:00:00
abstract：:In this study we assessed the influence of three different environmental salinities (5, 15 and 31 psu during 90 days) on growth, osmoregulation, energy metabolism and digestive capacity in juveniles of the Notothenioid fish Eleginops maclovinus. At the end of experimental time samples of plasma, liver, gill, intestine...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-015-0092-3
更新日期：2015-12-01 00:00:00
abstract：:To determine if there were organ-specific changes in immune responses or immune-endocrine interaction, we monitored in vitro immune response, cortisol sensitivity and number and affinity of glucocorticoid receptors (GR) in leukocytes from freshwater-adapted juvenile coho salmon (Oncorhynchus kisutch) during the physio...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004605
更新日期：1993-04-01 00:00:00
abstract：:In the end of the Discussion section, following information should be included. ...
journal_title：Fish physiology and biochemistry
pub_type： 已发布勘误
doi：10.1007/s10695-020-00889-3
更新日期：2020-12-01 00:00:00
