Abstract：
:Ecdysteroid production by the prothoracic glands of the tobacco hornworm, Manduca sexta was found to be under feedback control by the ecdysteroids in hemolymph using both culture in vivo in diapausing pupae lacking the brain-corpora cardiaca-corpora allata complex and the prothoracic glands and culture in vitro. Prothoracic glands having relatively high activity in larvae, prepupae, or developing pupae were inhibited by ecdysone or 20-hydroxyecdysone. By contrast, prothoracic glands with low activity from feeding larvae, day 1 non-diapausing pupae and diapausing pupae were activated by both ecdysone and 20-hydroxyecdysone in vivo and in vitro. Dose-response studies on diapausing pupal glands showed that ecdysone was the most effective activator. These findings suggest that prothoracic glands are either stimulated or inhibited by ecdysone or 20-hydroxyecdysone, depending on both the secretory activity of the gland and the effective level of ecdysteroids in hemolymph. Thus, when the glands are first activated, the ecdysteroids that are secreted show a positive feedback on the glands to increase ecdysteroid output. Then the activated glands are turned off by the increasing 20-hydroxyecdysone titer in the hemolymph leading to the rapid decrease in ecdysteroid titer at the end of the molt period.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Sakurai S,Williams CMdoi
10.1016/0016-6480(89)90072-5subject
Has Abstractpub_date
1989-08-01 00:00:00pages
204-16issue
2eissn
0016-6480issn
1095-6840journal_volume
75pub_type
杂志文章abstract：:A triacetyl form of α-melanocyte-stimulating hormone (MSH) was found in carp (Cyprinus carpio) and goldfish (Carassius auratus), by selective detection of mass profile for cell secretory granules using direct tissue matrix-assisted laser desorption ionization with time-of-flight mass spectrometry (MALDI-TOF MS) analys...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2011.11.009
更新日期：2012-01-15 00:00:00
abstract：:In anaesthetized young (6 weeks old) and adult (22-30 weeks old) domestic fowl, the administration of thyrotrophin releasing hormone (TRH; 1.0 micrograms/kg in young birds; 10.0 micrograms/kg in adults) or human pancreatic growth hormone-releasing factor (hpGRF(1-44)NH2; 10.0 micrograms/kg in both cases) markedly incr...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(85)90413-7
更新日期：1985-07-01 00:00:00
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journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.1999.7344
更新日期：1999-10-01 00:00:00
abstract：:In songbirds, neurons that regulate learned song behavior undergo extensive seasonal plasticity in their number and size in relation to the bird's reproductive status. Seasonal plasticity of these brain regions is primarily regulated by changes in circulating concentrations of testosterone. Androgen receptors are pres...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2009.08.001
更新日期：2010-03-01 00:00:00
abstract：:A clone encoding thyroid hormone receptor-beta (TR-beta) was isolated from a sea bream (Sparus aurata) ovary cDNA library. Sea bream (sb)TR-beta is closely related to its counterparts from other vertebrates and, like them, preferentially binds T3 rather than T4. However, the putative sbTR-beta protein contains a nine-...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.2001.7649
更新日期：2001-07-01 00:00:00
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journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(87)90176-6
更新日期：1987-02-01 00:00:00
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journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(87)90163-8
更新日期：1987-02-01 00:00:00
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journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(89)90008-7
更新日期：1989-07-01 00:00:00
abstract：:The activities of oxidative enzymes of hepatic mitochondria of Anabas testudineus increased following exogenous administration of hydrocortisone and corticosterone. The inhibitors of protein synthesis prevented the hormone-mediated increase of hepatic enzymes, suggesting that corticosteroids regulate the oxidative met...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(90)90017-g
更新日期：1990-05-01 00:00:00
abstract：:Our previous study showed that docosahexaenoic acid (DHA) plays an important role in decreasing lipid accumulation by inducing apoptosis of the adipocytes in grass carp. However, the mechanism involved remains unclear. DHA has been reported as the natural ligand of PPARγ. The present study aimed to assess whether PPAR...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2018.05.020
更新日期：2018-09-15 00:00:00
abstract：:Fluctuations in plasma androgen (testosterone and 5 alpha-dihydrotestosterone), corticosterone (B), and luteinizing hormone (LH) of male bullfrogs in central California were measured during the spring mating season. Androgen and LH levels generally increased in the population prior to the initiation of chorusing and e...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(85)90343-0
更新日期：1985-05-01 00:00:00
abstract：:The parathyroid glands of chickens were autotransplanted and the return of parathyroid function following transplantation was determined. Parathyroidectomy (PTX) resulted in a marked hypocalcemia (5.2 +/- 0.2 mg/dl) 4 hr following PTX. Plasma calcium (PCa) had declined to 4.3 +/- 0.2 mg/dl 24 hr after PTX. Parathyroid...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(89)90142-1
更新日期：1989-12-01 00:00:00
abstract：:Anthropogenic emissions of carbon dioxide in the atmosphere have generated rapid variations in atmospheric composition which drives major climate changes. Climate change related effects include changes in physico-chemical proprieties of sea and freshwater, such as variations in water temperature, salinity, pH/pCO2 and...
journal_title：General and comparative endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.ygcen.2020.113439
更新日期：2020-05-15 00:00:00
abstract：:Yellow catfish (Pelteobagrus fulvidraco) is an important freshwater fish species in China. In particular, an all-male population has been commercially produced for the males grow faster than females. However, the molecular mechanisms underlying sexual dimorphism of body size and sex differentiation are still unclear i...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2015.04.015
更新日期：2015-05-15 00:00:00
abstract：:Three types of cDNA encoding the arginine vasotocin (AVT) receptors from the newt, Cynops pyrrhogaster were cloned and the gene expression of each receptor analyzed in the organs and tissues of the newt. The deduced amino acid sequence of one type of AVT receptor, consisting of 418 amino acid residues, showed a high d...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2007.02.002
更新日期：2007-05-01 00:00:00
abstract：:In insects, especially phytophagous insects, feeding behavior occurs at a regular frequency. Although a number of physiological studies have revealed various causal factors leading to feeding behavior in insects, little has been demonstrated regarding the regulatory mechanisms underlying insect feeding behavior. To co...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2011.03.004
更新日期：2011-05-15 00:00:00
abstract：:Owl clutches typically hatch asynchronously, and brood size hierarchies develop. In this study, we describe intra-clutch variation of testosterone, androstenedione, estradiol, and corticosterone in Eastern screech owl egg yolks. In order to assess whether these hormones may have originated in the follicle, we also cha...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2011.04.001
更新日期：2011-07-01 00:00:00
abstract：:To study the effects of glucocorticoids and IGF-I on the modulation of growth in the tilapia Oreochromis mossambicus, we employed an epiceratobranchial cartilage radioisotope incorporation assay, wherein radiolabeled sulfate and thymidine uptakes are measured in vitro to indicate proteoglycan synthesis and cell prolif...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.2000.7599
更新日期：2001-03-01 00:00:00
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journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(85)90401-0
更新日期：1985-09-01 00:00:00
abstract：:The regulation of rainbow trout prolactin (PRL) cells by hypothalamic and humoral factors has been investigated. PRL cell activity was assessed using acid gel electrophoresis to measure PRL release in vitro and image analysis to measure PRL cell nuclear area, an index of synthetic activity. 17 beta-oestradiol stimulat...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.1994.1043
更新日期：1994-03-01 00:00:00
abstract：:Studies with 6-n-propyl-2-thiouracil (PTU) in laboratory rodents have shown that transient neonatal hypothyroidism leads to increased Sertoli cell (SC) number, testis size and sperm production. However, scarce and inconclusive data are available for farm animals. In the present study, Piau pigs received PTU in a gel c...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2020.113593
更新日期：2020-12-01 00:00:00
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journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2020.113610
更新日期：2020-12-01 00:00:00
abstract：:Progesterone is believed to have a suppressive or inhibitory role in regulating androgen-dependent sex behaviors in male mammals and birds. Previous studies in this laboratory have revealed that in the little striped whiptail lizard (Cnemidophorus inornatus), progesterone (P) can stimulate sex behavior in a proportion...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(92)90125-4
更新日期：1992-04-01 00:00:00
abstract：:The occurrence of myoendocrine-like cells investing the ampullar draining region of Malpighian tubules and neighboring midgut and hindgut regions of the ant Formica polyctena is reported. These striated muscle cells show small electron-dense endocrine-like granules (130 +/- 0.95 nm) in addition to myofilaments and ord...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.1994.1110
更新日期：1994-07-01 00:00:00
abstract：:Day length predicts changing of seasons at mid-latitudes, but additional environmental cues (e.g., temperature, rainfall) give more precise information about timing of food peaks critical for offspring survival. We tested the effects of temperature on seasonal reproductive development of male song sparrows (Melospiza ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2005.03.004
更新日期：2005-09-01 00:00:00
abstract：:In teleost fish, the predominant brain form of cytochrome P450 aromatase (P450aromB) is a neural marker of estrogen effect, and an entry point for studying the role of hormonal and environmental estrogens on neurodevelopment and neuroplasticity. As part of a project using zebrafish to investigate these issues, we deve...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2005.12.010
更新日期：2006-06-01 00:00:00
abstract：:The corticosterone response to the sight of a natural predator was investigated in free-living and captive great tits (Parus major). Free-living great tits responded to the sight of a stuffed, slowly moving Tengmalm's owl, a major predator of great tits, with warning calls and a change in behaviour around a feeder. Gr...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.2001.7749
更新日期：2002-02-01 00:00:00
abstract：:Hormones play key, functional roles in mediating the tradeoff between survival and reproduction. Glucocorticoid hormones can inhibit reproduction and improve chances of survival during periods of stress. However, glucocorticoid hormones are, at times, also associated with successfully engaging in energetically costly ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2014.08.008
更新日期：2014-11-01 00:00:00
abstract：:Sexual dimorphism in prenatal development is widespread among vertebrates, including birds. Its mechanism remains unclear, although it has been attributed to the effect of maternal steroid hormones. The aim of this study was to investigate how increased levels of steroid hormones in the eggs influence early embryonic ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2017.09.004
更新日期：2017-12-01 00:00:00
abstract：:Measurement of fish steroids in water provides a non-invasive alternative to measurement in blood samples, offering the following advantages: zero or minimal intervention (i.e. no anaesthetic, bleeding or handling stress); results not being biased by sampling stress; repeat measurements on the same fish; the possibili...
journal_title：General and comparative endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.ygcen.2006.11.006
更新日期：2007-08-01 00:00:00
