abstract：:To examine the physiological role of calcitonin (CT) in calcium homeostasis of teleosts, we compared calcium and CT levels in freshwater eels fed a high calcium-consomme solution (Ca2+: 1.25 M; 1 ml/100 g body wt) into the stomach (Experiment I), and in freshwater eels transferred from freshwater to seawater (Experime...

journal_title：General and comparative endocrinology

authors： Suzuki N,Suzuki D,Sasayama Y,Srivastav AK,Kambegawa A,Asahina K

更新日期：1999-06-01 00:00:00

abstract：:Female American tree sparrows (Spizella arborea) were injected with Na131I before, at, or after the onset of photostimulation in order to study the effect of time of thyroidectomy on three components of seasonality: thyroid-dependent photoperiodic ovarian growth, photorefractoriness, and postnuptial (prebasic) molt. T...

journal_title：General and comparative endocrinology

authors： Wilson FE,Reinert BD

更新日期：1999-06-01 00:00:00

abstract：:The developmental sequence of markers for hematopoietic, hormone-producing, and folliculo-stellate cells in the chicken adenohypophysis is described using immunohistochemical staining techniques. Hematopoietic cells are detected in cryosections of the adenohypophysis starting from 10- or 12-day embryos, using chicken-...

journal_title：General and comparative endocrinology

authors： Allaerts W,Boonstra-Blom AG,Peeters K,Janse EM,Berghman LR,Jeurissen SH

更新日期：1999-05-01 00:00:00

abstract：:Seasonal patterns of fecal 17beta-OH-androgen, estrogen, and progesterone equivalents of male and female greylag geese (Anser anser) were analyzed in a flock of free-living geese. These were compared among social categories determined by pairbond status and breeding success. The annual cycle was divided into 13 phases...

journal_title：General and comparative endocrinology

authors： Hirschenhauser K,Möstl E,Kotrschal K

更新日期：1999-04-01 00:00:00

abstract：:The brain of many teleost fish species, including the goldfish Carassius auratus, expresses exceptionally high levels of cytochrome P450 aromatase (estrogen synthetase). To begin investigating the molecular and cellular targets of estrogen action in goldfish brain, a polymerase chain reaction (PCR) cloning strategy wa...

journal_title：General and comparative endocrinology

authors： Tchoudakova A,Pathak S,Callard GV

更新日期：1999-03-01 00:00:00

abstract：:Gene duplication is a recurring theme in the evolution of vertebrate polypeptide hormones and neuropeptides. These duplication events can lead to the formation of gene families in which divergence of function is the usual outcome. In the case of the opioid/orphanin family of genes, duplication events have proceeded al...

journal_title：General and comparative endocrinology

authors： Danielson PB,Dores RM

更新日期：1999-02-01 00:00:00

abstract：:Current views on Agnathan phylogeny favor the hypothesis that the genera of holarctic lampreys belong to a single family (Petromyzontidae) and form an interrelated progression in which Petromyzon is near to Ichthomyzon at the base of the phylogenetic tree and Lampetra is the most derived. A stock similar to that of co...

journal_title：General and comparative endocrinology

authors： Wang Y,Nielsen PF,Youson JH,Potter IC,Conlon JM

更新日期：1999-02-01 00:00:00

abstract：:In lampreys, although gonadotropin (GTH) has not yet been isolated from the pituitary gland, the presence of GTH has been strongly suggested. To detect possible GTH in the sea lamprey (Petromyzon marinus) pituitary, two different cytochemical probes were tested: One was the use of antibodies to GTHs, and the other was...

journal_title：General and comparative endocrinology

authors： Nozaki M,Ominato K,Takahashi A,Kawauchi H,Sower SA

更新日期：1999-01-01 00:00:00

abstract：:Gonadotropin-releasing hormones (GnRH) constitute a family of neuropeptides which are important regulators of reproduction in vertebrates. The effect of mammalian GnRH (mGnRH), salmon GnRH, chicken GnRH-I, chicken GnRH-II, and lamprey GnRH-I on [3H]thymidine incorporation into DNA of dissociated gonadal cells of marin...

journal_title：General and comparative endocrinology

authors： Pazos AJ,Mathieu M

更新日期：1999-01-01 00:00:00

abstract：:Many vertebrates have more than one molecular form of gonadotropin-releasing hormone (GnRH) present in brain. In all cases documented to date, GnRH neurons located in the forebrain are critical players in the brain-pituitary-gonadal feedback axis although the details of how steroids regulate GnRH remain elusive. The f...

journal_title：General and comparative endocrinology

authors： Rissman EF,Li X

更新日期：1998-12-01 00:00:00

abstract：:A gonadotropin-releasing hormone (GnRH) agonist, d-Trp6-LHRH, was evaluated for its effectiveness in reducing circulating testosterone concentrations in wild Hawaiian monk seals (Monachus schauinslandi). Twenty-eight adult male seals were randomly divided into three groups: 10 were captured and treated with 7.5 mg of ...

journal_title：General and comparative endocrinology

authors： Atkinson S,Ragen TJ,Gilmartin WG,Becker BL,Johanos TC

更新日期：1998-11-01 00:00:00

abstract：:The potential effects of growth hormone (GH), prolactin (Prl), and triiodothyronine (T3) on gill Na+,K+-ATPase activity and corticosteroid receptor (CR) concentration (Bmax) and dissociation constant (Kd) were examined in juvenile Atlantic salmon (Salmo salar). Compared to controls, fish injected with GH (ovine, 5.0 m...

journal_title：General and comparative endocrinology

authors： Shrimpton JM,McCormick SD

更新日期：1998-11-01 00:00:00

abstract：:Glucagon and peptide of the neuropeptide Y (NPY) family immunoreactivities were studied in the gut of sea bass (Dicentrarchus labrax) using antisera against bovine/porcine glucagon, porcine glucagon, glicentin (10-30), bovine pancreatic polypeptide (PP), peptide tyrosine tyrosine (PYY), salmon PYY (sPYY), and NPY. Glu...

journal_title：General and comparative endocrinology

authors： Gómez-visus I,García-Hernández MP,Lozano MT,Agulleiro B

更新日期：1998-10-01 00:00:00

abstract：:In adult domestic fowl, angiotensin (ANG) receptors are present in the vascular smooth muscles (VSM) and in the endothelium, mediating vasorelaxation via endothelium-derived relaxing factor/cGMP. ANG II-induced relaxation is minor in chicks and becomes more marked as they mature but diminishes in adult birds, whereas ...

journal_title：General and comparative endocrinology

authors： Shimada T,Fabian M,Yan HQ,Nishimura H

更新日期：1998-10-01 00:00:00

abstract：:Seasonal changes in testicular structure and function in three species of Korean frogs (Rana nigromaculata, R. rugosa, and R. dybowskii) having different breeding seasons and habitats were examined throughout the year. R. nigromaculata live in rice fields and breed in early May. Their gonadosomatic index (GSI) and tes...

journal_title：General and comparative endocrinology

authors： Ko SK,Kang HM,Im WB,Kwon HB

更新日期：1998-09-01 00:00:00

abstract：:Chickens were used as a model to further analyze the efficacy and specificity of L-692,429, a novel nonpeptidyl mimic of growth hormone (GH)-releasing peptide-6 (GHRP-6), which is a specific GH-releasing secretagogue in mammals. Actions at the level of the pituitary and the hypothalamus were studied. Pituitaries isola...

journal_title：General and comparative endocrinology

authors： Geris KL,Hickey GJ,Berghman LR,Visser TJ,Kühn ER,Darras VM

更新日期：1998-08-01 00:00:00

abstract：:The recent purification of two gonadotropins, GTH I and GTH II, in teleost fish and the development of their specific radioimmunoassays using antibodies directed against their beta subunits have demonstrated that earlier assays for GTH II also measured GTH I. Most of the results on the gonadotropic control of reproduc...

journal_title：General and comparative endocrinology

authors： Breton B,Govoroun M,Mikolajczyk T

更新日期：1998-07-01 00:00:00

abstract：:The gross morphology, histology, and ultrastructure of the thyroid gland of the koala, Phascolarctos cinereus, is described. Generally, the glands were found to contain large-diameter follicles in association with an epithelium of low height. Morphometric analysis demonstrated a high relative thyroid weight (0.3 +/- 0...

journal_title：General and comparative endocrinology

authors： Lawson VJ,Carrick FN

更新日期：1998-06-01 00:00:00

abstract：:Seasonal and daily variation in basal plasma concentrations of corticosterone and the effect of short-term confinement on plasma corticosterone concentration were examined in wild adult male and female tuatara (Sphenodon punctatus) on Stephens Island, New Zealand. Males and females sampled immediately upon capture at ...

journal_title：General and comparative endocrinology

authors： Tyrrell CL,Cree A

更新日期：1998-05-01 00:00:00

abstract：:Thyroidectomy of starlings (Sturnus vulgaris) prevents the decrease in hypothalamic gonadotrophin-releasing hormone (GnRH) which normally occurs at the onset of photorefractoriness. To extend this observation to another species, changes in testicular mass, bill colour, moult, and hypothalamic GnRH content were monitor...

journal_title：General and comparative endocrinology

authors： Dawson A

更新日期：1998-05-01 00:00:00

abstract：UNLABELLED:Melatonin (MT) release from explanted pineal glands of 3- to 20-week-old chicken was investigated in a 5-day perifusion system. Both the chicken and the explanted glands were exposed to various environmental lighting regimens. OBSERVATIONS:(1) The explanted chicken pineal is sensitive to direct light. Conti...

journal_title：General and comparative endocrinology

authors： Csernus V,Ghosh M,Mess B

更新日期：1998-04-01 00:00:00

abstract：:The relations among rearing environment, fish size, insulin-like growth factor-I, and smoltification were examined in yearling spring chinook salmon (Oncorhynchus tshawytscha). Juvenile chinook salmon were size-graded into small and large categories. Half of the fish in each group were reared at an increased temperatu...

journal_title：General and comparative endocrinology

authors： Beckman BR,Larsen DA,Moriyama S,Lee-Pawlak B,Dickhoff WW

更新日期：1998-03-01 00:00:00

abstract：:During normal pupal-adult development, programmed cell death of the prothoracic gland of Manduca sexta proceeds via apoptosis. By employing the DNA laddering technique, the earliest sign of DNA fragmentation in the cells comprising the gland occurred on Day 5 of pupal-adult development and DNA fragmentation peaked 1 d...

journal_title：General and comparative endocrinology

authors： Dai JD,Gilbert LI

更新日期：1998-02-01 00:00:00

abstract：:We studied effects of in vitro conditions on the steady-state distribution and exchange of thyroid hormones (TH) between red blood cells (RBC) and plasma of rainbow trout. At steady state at 12 degrees C the RBC contained 5-11% of L-thyroxine (T4), 14-23% of 3,5,3'-triiodo-L-thyronine (T3), and 23-24% of 3,3',5'-triio...

journal_title：General and comparative endocrinology

authors： McLeese J,Waytiuk A,Eales JG

更新日期：1998-02-01 00:00:00

abstract：:Effects of Al on estradiol-induced vitellogenin (VTG) induction were electrophoretically examined in primary hepatocyte cultures in rainbow trout. Hepatocytes were precultured for 2 days and then estradiol-17 beta (E2, 6 x 10(-6) M) and Al (10(-6)-10(-4) M) were added to the incubation medium. The hepatocytes were cul...

journal_title：General and comparative endocrinology

authors： Mugiya Y,Tanahashi A

更新日期：1998-01-01 00:00:00

abstract：:Day- and nighttime contents of pineal melatonin and other indoleamines were measured in the Chinese hamster, Cricetulus griseus. The hamsters were inbred in our colony and kept in LD 14:10. Absolute levels of pineal melatonin and N-acetylserotonin contents were extremely low, but showed a significant circadian rhythm ...

journal_title：General and comparative endocrinology

authors： Harumi T,Matsushima S

更新日期：1998-01-01 00:00:00

abstract：:There are more CRH-like immunoreactive neurons in the preoptic nucleus and nucleus lateralis tuberis in the brain of feral brown trout, Salmo trutta, living in cadmium- and zinc-contaminated regions of the Eagle River than in fish from an uncontaminated control site. Histological analyses revealed that interrenal cell...

journal_title：General and comparative endocrinology

authors： Norris DO,Felt SB,Woodling JD,Dores RM

更新日期：1997-12-01 00:00:00

abstract：:In goldfish, plasma gonadotropin levels increase during spawning in both males and females (GTH surge). A female-typical GTH surge induces ovulation (ovulatory surge), and a male-typical surge triggers milt production in response to sex pheromones released from ovulatory females. This study examined whether the male-t...

journal_title：General and comparative endocrinology

authors： Kobayashi M,Furukawa K,Kim MH,Aida K

更新日期：1997-12-01 00:00:00

abstract：:The presence of multiple forms of gonadotropin-releasing hormone (GnRH) within a single brain is common among vertebrate species. In previous studies of reptiles, two forms of GnRH were isolated from the brain of alligators and the primary structure was determined to be that of chicken (c)GnRH-I and cGnRH-II. GnRH has...

journal_title：General and comparative endocrinology

authors： Lescheid DW,Rosen GJ,Bridge AE,Jones RE,Warby CM,Sherwood NM

更新日期：1997-11-01 00:00:00

abstract：:Chicken growth hormone (cGH) has been shown to affect chicken skeletal muscle satellite cell proliferation and differentiation in vitro. This study describes the interactions of cGH with basic fibroblast growth factor (bFGF) and insulin-like growth factor I (IGF-I). Both cGH and bFGF induced cGH receptor (cGH-R) gene ...

journal_title：General and comparative endocrinology

authors： Hodik V,Mett A,Halevy O

更新日期：1997-10-01 00:00:00

abstract：:Studies of the ontogeny of IGF-I mRNA during embryonic and larval development of the gilthead sea bream Sparus aurata showed its expression during these early developmental stages. The present study applies in situ hybridization to localize IGF-I and IGF receptor mRNAs in 16-day larvae of S. aurata. Paraffin sections ...

journal_title：General and comparative endocrinology

authors： Funkenstein B,Almuly R,Chan SJ

更新日期：1997-09-01 00:00:00

abstract：:The Harderian gland of the lizard Podarcis sicula sicula (Raf) contains connective tissue type mast cells whose numbers vary during the year showing two peaks, one in spring the other in winter. No sex differences are found throughout the year. Thermal and photoperiodic manipulations indicate that only temperature inf...

journal_title：General and comparative endocrinology

authors： Vitiello II,Baccari GC,Di Matteo L,Rusciani A,Chieffi P,Minucci S

更新日期：1997-09-01 00:00:00

abstract：:Effects of epidermal growth factor (EGF) and possible mechanisms of EGF-mediated signal transduction were investigated in isolated cells of the digestive gland of the mussel (Mytilus galloprovincialis Lam. ). EGF induced a cytosolic Ca2+ transient and subsequently stimulated DNA synthesis; both effects were dose-depen...

journal_title：General and comparative endocrinology

authors： Canesi L,Ciacci C,Orunesu M,Gallo G

更新日期：1997-08-01 00:00:00

abstract：:The present study examined plasma concentrations of insulin-like growth factor (IGF)-I, IGF-II and IGF-binding proteins (IGFBPs) during posthatch growth and development in chickens. Three distinct proteins which bound 125I-IGF-I were observed irrespective of age or sex, these having apparent molecular weights of 22, 2...

journal_title：General and comparative endocrinology

authors： Radecki SV,Capdevielle MC,Buonomo FC,Scanes CG

更新日期：1997-07-01 00:00:00

abstract：:This study investigated the pathways to many monoamines and their metabolites in the central nervous system of the frog Rana nigromaculata and the toad Bufo bufo japonicus during embryonic development and metamorphosis. Metabolites were analyzed by three-dimensional HPLC. The two species provided evidence of similar p...

journal_title：General and comparative endocrinology

authors： Takeda N

更新日期：1997-06-01 00:00:00

abstract：:The skeletal muscles of ectothermic vertebrates possess an elevated glyconeogenic capacity that is responsible for a major portion of lactate removal and glycogen resynthesis following exercise. In lizards, changes in plasma hormone levels and the influence of differing hormone levels on muscle metabolism postexercise...

journal_title：General and comparative endocrinology

authors： Scholnick DA,Weinstein RB,Gleeson TT

更新日期：1997-05-01 00:00:00

abstract：:Allatostatin-like immunoreactivity was demonstrated in the central nervous system (CNS) neurons of the freshwater pulmonate snails Bulinus globosus (Planorbidae) and Stagnicola elodes (Lymnaeidae). Immunopositive neurons were localized using a monoclonal antibody highly specific to allatostatin I (APSGAQRLYGFGL-amide)...

journal_title：General and comparative endocrinology

authors： Rudolph PH,Stay B

更新日期：1997-05-01 00:00:00

abstract：:The distribution and identity of the various endocrine cell types were examined in the pancreas, stomach, and anterior intestine of the phylogenetically ancient actinopterygian, the gar (Lepisosteus osseus L.), using immunohistochemistry. Antisera used were directed against several insulins (INSs) and somatostatins (S...

journal_title：General and comparative endocrinology

authors： Groff KE,Youson JH

更新日期：1997-04-01 00:00:00

abstract：:The effects of estradiol (E2) on growth hormone (GH) production was investigated in gonad-intact female goldfish. It was first necessary to generate a specific antibody for use in immunocytochemistry, Western, and dot-blot analyses of GH production. To accomplish this, grass carp GH (gcGH) cDNA was cloned by the rever...

journal_title：General and comparative endocrinology

authors： Zou JJ,Trudeau VL,Cui Z,Brechin J,Mackenzie K,Zhu Z,Houlihan DF,Peter RE

更新日期：1997-04-01 00:00:00

abstract：:In recent years, invertebrate peptides have been identified which share substantial homologies with vertebrate insulin and insulin-like growth factors (IGFs), indicating a high degree of conservation of insulin/IGF systems through animal evolution. In a previous study, we provided evidence for the presence of IGF-I-li...

journal_title：General and comparative endocrinology

authors： Richardson NA,Anderson AJ,Sara VR

更新日期：1997-03-01 00:00:00