Abstract:
:The in vitro effects of salmon gonadotropin-releasing hormone (sGnRH), substance P (SP), and their antagonists on prostaglandin F2 alpha (PGF2 alpha), prostaglandin E2 (PGE2), progesterone, androgens, and estradiol-17 beta release by follicles and corpus luteum (CL) of the oviparous lizard, Podarcis sicula sicula, were studied. Follicles and CL were divided according to the different developmental stages; follicles: pre-vitellogenic, early-vitellogenic, mid-vitellogenic, and fully grown; CL: CL1 (unshelled eggs in the oviducts), CL2 (shelled eggs in the oviducts), CL3 (eggs laid 6 hr previously), and CL4 (eggs laid 48 hr previously). SGnRH increased PGF2 alpha and progesterone release by mid-vitellogenic and fully grown follicles; SP increased PGE2 and estradiol-17 beta release by pre-vitellogenic, mid-vitellogenic, and fully grown follicles. SGnRH and SP decreased PGE2 and progesterone and increased PGF2 alpha by CL1 and CL2. The antagonists of these two neuropeptides induced the opposite effects of those of sGnRH and SP. The present data indicate that sGnRH and SP play different roles in the regulation of prostaglandins and sex steroid production by ovarian follicles and CL of P. s. sicula.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Gobbetti A,Zerani M,Di Fiore MMdoi
10.1006/gcen.1994.1018subject
Has Abstractpub_date
1994-02-01 00:00:00pages
153-62issue
2eissn
0016-6480issn
1095-6840pii
S0016-6480(84)71018-5journal_volume
93pub_type
杂志文章abstract::Plasma profiles of several gonadal steroids and cortisol were examined in a field population of the protandrous, sex-changing anemonefish Amphiprion melanopus to elucidate potential roles of these hormones in gonadal sex change. Sex change was experimentally induced in males by removal of their dominant female pair ma...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1993.1114
更新日期:1993-08-01 00:00:00
abstract::Oxidative stress impaired sperm function might lead to infertility. The objective of this study was to evaluate the effects of altered thyroid hormone levels on regulation of mitochondrial glutathione redox status and its dependent antioxidant defense system in adult rat testis and their correlation with testicular fu...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2010.07.014
更新日期:2010-10-01 00:00:00
abstract::We have found that the inhibition of thyroxine-induced tail fin regression by prolactin in larval tiger salamanders is antagonized by oxytocin. Other workers have shown that prolactin blocks the rise in activity of several hydrolytic enzymes that occurs in regressing tissue during metamorphosis. Here, we examine the e...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(86)90223-6
更新日期:1986-03-01 00:00:00
abstract::A reliable and rapid technique for the measurement of estradiol-17 beta, testosterone, progesterone, 17 alpha-hydroxyprogesterone, 17 alpha,20 beta-dihydroxy-4-pregnen-3-one, and cortisol by reverse-phase high-performance liquid chromatography and radioimmunoassay in single female goldfish serum samples of 50 microlit...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(89)90135-4
更新日期:1989-12-01 00:00:00
abstract::The Atlantic Bluefin Tuna (ABFT, Thunnus thynnus) is one of the most intensely exploited fisheries resources in the world. In spite of the years of studies on ABFT, basic aspects of its reproductive biology remain uncertain. To gain insight regarding the seasonal changes of the reproductive characteristics of the east...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2019.113216
更新日期:2019-10-01 00:00:00
abstract::Plasma progesterone concentrations were measured every 2 or 3 days in eastern quoll, Dasyurus viverrinus, during pregnancy (20.5 +/- 0.8 days, n = 6, mean +/- SEM) and the estrous cycle (37.5 +/- 0.7 days, n = 20, mean +/- SEM). The pattern was not apparently different between the two reproductive states. There was a ...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(89)90015-4
更新日期:1989-07-01 00:00:00
abstract::A radioimmunoassay (RIA) capable of determining blood ACTH levels in salmonid fishes was developed and validated. The RIA used an antibody raised against mammalian ACTH, iodinated human ACTH as tracer, and human 1-39 ACTH as standard. Incubation of the standard or unknown with antibody for 3 days before addition of as...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(86)90046-8
更新日期:1986-06-01 00:00:00
abstract::Phenotypic effects of global warming have been documented in many different taxa. However, the importance of transgenerational phenotypic plasticity in these adaptations are seldom studied. In birds, temperature could affect egg characteristics. Higher temperatures during egg-laying may reduce maintenance costs for fe...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2019.02.004
更新日期:2019-05-01 00:00:00
abstract::Abnormalities in calcium (Ca(2+)) homeostasis are reported in horses with several pathological conditions; however, there is little information on Ca(2+) regulation in horses. The objectives of the present study were to determine the Ca(2+) set-point in healthy horses, to determine whether the Ca(2+)/parathyroid hormo...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/s0016-6480(02)00621-4
更新日期:2003-02-15 00:00:00
abstract::A rapid and sensitive heterologous enzyme-linked immunosorbent assay (ELISA) was developed to measure rainbow trout maturational gonadotropin. Purified salmon maturational gonadotropin (sGtH II) was used as reference hormone. Optimization of the procedure was performed by using an anti-beta sGtH serum. Two procedures ...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(90)90052-n
更新日期:1990-04-01 00:00:00
abstract::In immature ducklings injected with hypertonic saline the volume of extrarenal salt gland secretion was unaffected by prior treatment (immediately or 4 hr before salt loading) with long-lasting adrenocorticotrophin (ACTH 100 iu/kg, im) or exogenous corticosterone (1.0 mg/kg, im). Pretreatment with metyrapone, an 11-be...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(85)90316-8
更新日期:1985-11-01 00:00:00
abstract::The purpose of this study was to investigate the physiological maturation-inducing steroid (MIS) in the marine protandrous yellowfin porgy (Acanthopagrus latus). Female fish were injected with 2 doses of LHRH analog (10 and 40 μg per kg). Ovarian tissue was obtained at 6 h intervals for in vitro analysis of oocyte mat...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2012.01.010
更新日期:2012-04-01 00:00:00
abstract::In addition to the previously recognised thyroid hormone-binding proteins, three plasma components possibly involved in T3 and T4 transport have been identified in chicken plasma using gel filtration at pH 7.4. In mature female, though not male and immature female birds, a significant amount of T3 (11%) is bound to ve...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(85)90276-x
更新日期:1985-02-01 00:00:00
abstract::Growth hormone-releasing hormone (GHRH) plays a pivotal role in the regulation of growth. The study of goldfish GHRH and its receptor is of particular interest as it is so far the only animal model in which two forms of GHRH-like (catfish-like and salmon-like) peptides coexist, and these peptides share only 30-40% of ...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2004.09.010
更新日期:2005-01-01 00:00:00
abstract::Methallibure treatment (1 mg fed on alternate days to a female and a male kept in 1 liter of 25% seawater) started from 1 or 7 days postpartum (early gestation) inhibited gestation in the wild guppy, Poecilia reticulata. A few of the fish treated from 7 days postpartum (2/9) did give birth, but the young either were d...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(85)90329-6
更新日期:1985-11-01 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::Uptake of L-thyroxine (T4) by isolated trout hepatocytes was characterized after 1-min incubation of cells in a Hanks' balanced salts medium containing glucose and [125I]T4. Centrifugation through silicone oil and glycine buffer (pH 10.5) was used to separate cells from the medium and minimize extracellular binding of...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1993.1057
更新日期:1993-04-01 00:00:00
abstract::The isolation of a maturational gonadotropin from pituitaries of Atlantic croaker (Micropogonias undulatus), a marine teleost belonging to the order perciformes, is described. A radioimmunoassay has been developed for the measurement of this hormone in blood samples and validation of the assay is presented. The hormon...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(89)90200-1
更新日期:1989-03-01 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
pub_type: 杂志文章
doi:10.1006/gcen.1998.7236
更新日期:1999-04-01 00:00:00
abstract::The aim of the present study was to determine the relationship between seasonal variation in levels of insulin, cortisol, and corticosterone and body mass in a natural population of golden-mantled ground squirrels (Spermophilus saturatus) over the active season, from April to August. The body mass of females is at an ...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1994.1189
更新日期:1994-12-01 00:00:00
abstract::The presence and distribution of cholecystokinin (CCK)/gastrin-like immunoreactivity (IR) was examined in the goldfish pituitary. Intense CCK/gastrin-like IR was consistently observed within fibers of the proximal pars distalis (PD), with fewer IR fibers localized in the rostral PD. Within the proximal PD CCK/gastrin-...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1993.1146
更新日期:1993-10-01 00:00:00
abstract::Gonadotropin-releasing hormone (GnRH) plays a central role in vertebrate reproduction. The evolutionary origin of this neuropeptide and its receptor is not obvious, but the advent of genomics makes it possible to examine the roots of GnRH and delve deeper into its ancestral relationships. New peptide sequences identif...
journal_title:General and comparative endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.ygcen.2010.12.014
更新日期:2011-03-01 00:00:00
abstract::The importance of late winter pairing activity on the neuroendocrinology of wild waterfowl is unknown. In this study, we examined the sex-related differences in the roles of late winter pairing activity and seasonal influences on neuroendocrine and reproductive physiology in both male and female mallards. Our main goa...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.2000.7469
更新日期:2000-05-01 00:00:00
abstract::Several neuropeptides possessing the RFamide motif at their C-termini (designated RFamide peptides) have been characterized in the hypothalamus of a variety of vertebrates. Since the discovery of the 26-amino acid RFamide peptide (termed 26RFa) from the frog brain, 26RFa has been shown to exert orexigenic activity in ...
journal_title:General and comparative endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.ygcen.2013.03.014
更新日期:2013-09-01 00:00:00
abstract::Several lines of evidence support a role of endogenous opioids in the brain's regulation of gonadotropin secretion in birds and mammals, although the neuroanatomic basis of such regulation is not clear. We used double-label fluorescence immunohistochemistry employing polyclonal antisera raised in sheep against chicken...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/s0016-6480(02)00029-1
更新日期:2002-06-15 00:00:00
abstract::Goldfish GH-releasing hormone (gGHRH) has been recently identified and shown to stimulate GH release in goldfish. In goldfish, neuroendocrine regulation of GH release is multifactorial and known stimulators include goldfish ghrelin (gGRLN19) and salmon gonadotropin-releasing hormone (sGnRH), factors that also enhance ...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2013.02.037
更新日期:2013-06-01 00:00:00
abstract::In rainbow trout, a variable in vivo pituitary sensitivity to GnRH has been previously observed, depending on the stage of oogenesis. The purpose of the present work was to study, in vitro, the role of oestradiol (E2) and 17 alpha-hydroxy,20 beta-dihydroprogesterone (17 alpha 20 beta P), respectively, involved in vite...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(90)90079-2
更新日期:1990-09-01 00:00:00
abstract::To examine the relative growth, endocrine, and gene expression effects of growth hormone (GH) transgenesis vs. GH protein treatment, wild-type non-transgenic and GH transgenic coho salmon were treated with a sustained-release formulation of recombinant bovine GH (bGH; Posilac). Fish size, specific growth rate (SGR), a...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2012.03.002
更新日期:2012-05-15 00:00:00
abstract::A specific polyclonal antiserum directed against the somatostatin-28(1-14) of vertebrates was applied to sections of the planarians Dugesia lugubris and Dendrocoelum lacteum. This made it possible to reveal nerve cells and processes specifically both in cerebral ganglia and in ventral nerve cords. The phylogenetic imp...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(90)90035-k
更新日期:1990-06-01 00:00:00
abstract::The majority of birds use environmental cues to time their reproduction. Photoperiod is the most dominant cue, but other environmental factors may play a critical role in successful reproduction. Some previous studies show the effect of temperature on the timing of nest building and reproduction. Here we tested if the...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2020.113654
更新日期:2021-01-15 00:00:00