Abstract：
:Although much is known about the reproductive biology of pond-breeding frogs, there is comparatively little information about terrestrial-breeding anurans, a highly successful and diverse group. This study investigates the activation and in vitro fertilization of eggs of the Puerto Rican coqui frog obtained by hormonally induced ovulation. We report that spontaneous activation occurs in 34% of eggs, probably in response to mechanical stress during oviposition. Artificial activation, as evidenced by the slow block to polyspermy and the onset of zygote division, was elicited both by mechanical stimulation and calcium ionophore exposure in 64% and 83% of the cases, respectively. Finally, one in vitro fertilization protocol showed a 27% success rate, despite the fact that about one third of all unfertilized eggs obtained by hormone injection auto-activate. We expect these findings to aid in the conservation effort of Eleutherodactylus frogs, the largest vertebrate genus.
journal_name
Reprod Biol Endocrinoljournal_title
Reproductive biology and endocrinology : RB&Eauthors
Toro E,Michael SFdoi
10.1186/1477-7827-2-60keywords:
subject
Has Abstractpub_date
2004-08-05 00:00:00pages
60issn
1477-7827pii
1477-7827-2-60journal_volume
2pub_type
杂志文章abstract：BACKGROUND:Morphometric and morphokinetic evaluation of in vitro cultured human embryos allows evaluation without time restriction and reduces intra- and inter-observer variability. Even though these technologies have been reported to improve the quality of cleavage stage embryo evaluation during fresh culture, possibl...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-017-0299-5
更新日期：2017-10-03 00:00:00
abstract：:Trophoblast cells are unique because they are one of the few mammalian cell types that do not express major histocompatibility complex (MHC) class II antigens, either constitutively or after exposure to IFN-gamma. The absence of MHC class II antigen expression on trophoblast cells has been postulated to be one of the ...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章,评审
doi：10.1186/1477-7827-2-52
更新日期：2004-07-05 00:00:00
abstract：:Gonadotropins extracted from the urine of post-menopausal women have traditionally been used to stimulate folliculogenesis in the treatment of infertility and in assisted reproductive technology (ART). Products, such as human menopausal gonadotropin (hMG), consist not only of a mixture of the hormones, follicle-stimul...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章,评审
doi：10.1186/1477-7827-12-95
更新日期：2014-10-03 00:00:00
abstract：:Cloning mammals by nuclear transfer is a powerful technique that is quickly advancing the development of genetically defined animal models. However, the overall efficiency of nuclear transfer is still very low and several hurdles remain before the power of this technique will be fully harnessed. Among these hurdles in...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章,评审
doi：10.1186/1477-7827-1-84
更新日期：2003-11-07 00:00:00
abstract：BACKGROUND:Serum leptin levels are augmented in obese infertile men and in men with azoospermia. They also correlate inversely with sperm concentration, motility and normal forms. The mechanisms underlying the adverse effects of excess leptin on male reproductive function remain unclear. The present study aimed to eval...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-018-0368-4
更新日期：2018-05-31 00:00:00
abstract：BACKGROUND:Endometriosis is a known cause of infertility. Differences in immune tolerance caused by regulatory T cells (Tregs) and transforming growth factor-β (TGF-β) are thought to be involved in the pathology of endometriosis. Evidence has indicated that Tregs can be separated into three functionally and phenotypica...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-018-0325-2
更新日期：2018-02-01 00:00:00
abstract：BACKGROUND:New anticancer treatments have increased survival rates for cancer patients, but often at the cost of sterility. Several strategies are currently available for preserving fertility. However, the chances of achieving a pregnancy with one technique are still limited. A combination of methods is therefore recom...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-11-19
更新日期：2013-03-05 00:00:00
abstract：BACKGROUND:Claudin-4 (CLDN4) is one of several proteins that act as molecular mediators of embryo implantation. Recently, we examined immunolabeling of leukemia inhibitory factor (LIF) in the endometrial tissue of 52 IVF patients, and found that LIF staining intensity was strongly correlated with successful pregnancy i...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-7-30
更新日期：2009-04-19 00:00:00
abstract：BACKGROUND:Age at menarche is the reflection of cumulative pre-adolescent exposure of girls to either adverse environment such as food insecurity or affluent living conditions. Food insecurity could result in inadequate nutrient intake and stress, both of which are hypothesized to have opposing effects on the timing of...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-9-125
更新日期：2011-09-13 00:00:00
abstract：BACKGROUND:The physiological state of the dominant follicle is important as it may be linked to the competence of the oocyte within. The objective of this study was to analyze, by transcriptomic analysis, the changes occurring in granulosa cells from dominant follicles at different phases of follicular growth. METHODS...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-015-0010-7
更新日期：2015-03-08 00:00:00
abstract：BACKGROUND:Methadone is the therapeutic agent of choice for the treatment of opiate addiction in pregnancy. The co-consumption (heroin, cocaine) which may influence the effects of methadone is frequent. Therefore, the impact of cocaine and heroin on the placental transfer of methadone and the placental tissue was inves...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-7-61
更新日期：2009-06-11 00:00:00
abstract：BACKGROUND:Matrix metalloproteinase 2 (MMP-2) has been reported to be an important regulator of cell migration and invasion through degradation of the extracellular matrix (ECM) in many diseases, such as cancer and endometriosis. Here, we found calcium-activated neutral protease 7 (CAPN 7) expression was markedly upreg...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-11-64
更新日期：2013-07-15 00:00:00
abstract：BACKGROUND:Seminal plasma serves as a natural reservoir of antioxidants. It helps to remove excessive formation of reactive oxygen species (ROS) and consequently, reduce oxidative stress. Proteomic profiling of seminal plasma proteins is important to understand the molecular mechanisms underlying oxidative stress and s...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-11-85
更新日期：2013-09-03 00:00:00
abstract：BACKGROUND:L-carnitine (LC), and its acetylated form, acetyl L-carnitine (ALC), have immense functional capabilities to regulate the oxidative and metabolic status of the female reproductive system. The vulnerability of this system to free radicals demand for advanced strategies to combat them. For this purpose, the 'q...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章,评审
doi：10.1186/s12958-018-0323-4
更新日期：2018-01-26 00:00:00
abstract：BACKGROUND:Relaxin is detected in seminal plasma of many species and its association with sperm motility may be beneficial in some aspects of assisted reproduction. Here, we immunolocalized relaxin receptors and investigated the effects of exogenous relaxin on motility characteristics, viability, and cAMP content of bo...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-015-0021-4
更新日期：2015-03-31 00:00:00
abstract：BACKGROUND:Spermatic cord torsion can lead to testis ischemia (I) and subsequent ischemia-reperfusion (I/R) causing germ cell-specific apoptosis. Previously, we demonstrated that the hypoxia-inducible factor-1 (HIF-1) transcription factor, a key regulator of physiological responses to hypoxia, is abundant in Leydig cel...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-10-104
更新日期：2012-12-05 00:00:00
abstract：:Gonadotropin-primed immature rats (GPIR) constitute a widely used model for the study of ovulation. Although the equivalence between the ovulatory process in immature and adult rats is generally assumed, the morphological and functional characteristics of ovulation in immature rats have been scarcely considered. We de...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-2-63
更新日期：2004-09-03 00:00:00
abstract：OBJECTIVES:To report the occurrence of a rare case of a huge benign ovarian tumour (mucinous cystadenoma) in Jazan city, Saudi Arabia. PATIENTS:Our reported case was a middle-aged Saudi woman presented with marked abdominal distension and discomfort at the gynaecology clinic of Jazan General Hospital, Jazan city, Saud...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-8-24
更新日期：2010-03-11 00:00:00
abstract：BACKGROUND:To evaluate the relationship between endometrial thickness on day of human chorionic gonadotrophin administration (hCG) and pregnancy outcome in a large number of consecutive in vitro fertilization and embryo transfer (IVF-ET) cycles. METHODS:A retrospective cohort study including all patients who had IVF-E...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-6-37
更新日期：2008-09-02 00:00:00
abstract：BACKGROUND:Human uterine leiomyoma (fibroids; LYO) are the most common benign neoplasms in reproductive-aged women. Dysregulated extracellular matrix and irregular LYO reversion-inducing cysteine-rich protein with Kazal motifs (RECK) expression are thought to be mediated by aberrant microRNA (miR) expression. The relat...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-016-0180-y
更新日期：2016-08-17 00:00:00
abstract：BACKGROUND:Endocannabinoids (ECs) are important contributors to implantation and decidualization and are suppressed in early pregnancy. Elevated levels of anandamide (AEA), the endogenous ligand for the CB1 and CB2 receptors (R), interfere with receptivity of the blastocyst. Ang-(1-7) is down-regulated in the implantat...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-13-5
更新日期：2015-01-17 00:00:00
abstract：BACKGROUND:Despite being born with a significant number of primordial cells which representing the ancestor cells of the germ-line, women experience a depletion of ovarian reserve and sub-fertility mid-way into their healthy lives. The poor ovarian response is a substantial limiting factor amplified with higher materna...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-019-0464-0
更新日期：2019-02-11 00:00:00
abstract：:For the extrapolation of data obtained from experimental animals to the human situation, it is important to know the similarities and differences between human and animal species. Some important characteristics of nitric oxide synthase (NOS) in myometrium and vagina from human and rat were compared. NOS-activity was m...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-1-10
更新日期：2003-02-06 00:00:00
abstract：BACKGROUND:High altitude is associated with both low pulse oxygen saturation at birth and more pre-term deliveries. The present study was performed to determine pulse oxygen saturation in newborns at term in Cerro de Pasco (4340 m) and Lima (150 m) to test the hypothesis that low pulse oxygen saturation at birth at hig...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-3-46
更新日期：2005-09-12 00:00:00
abstract：BACKGROUND:The fibrinolytic system and its inhibitors play a number of roles, apart from their function in blood haemostasis and thrombosis, namely in ovarian folliculogenesis and in ovulation. Plasminogen is converted to active plasmin at the time of follicular rupture through a decrease in plasminogen activator inhib...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-019-0472-0
更新日期：2019-03-16 00:00:00
abstract：:Preimplantation embryo development involves four stages: fertilization, cell cleavage, morula and blastocyst formation. During these stages, maternal and zygotic epigenetic factors play crucial roles. The gene expression profile is changed dramatically, chromatin is modified and core histone elements undergo significa...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章,评审
doi：10.1186/1477-7827-7-59
更新日期：2009-06-05 00:00:00
abstract：BACKGROUND:The aim of this study was to compare pregnancy rates in patients undergoing IVF/ICSI with embryo transfer after 4 and 5 days of culture in a closed incubation system with integrated time-lapse imaging. METHODS:Out of n = 2207 in vitro fertilization (IVF)/ intracytoplasmic sperm injection (ICSI) cycles perfo...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/s12958-017-0253-6
更新日期：2017-05-08 00:00:00
abstract：BACKGROUND:Leukocytes represent the predominant source of reactive oxygen species both in seminal plasma and in sperm suspensions and have been demonstrated to negatively influence sperm function and fertilization rate in assisted reproduction procedures. Peroxidase test is the standard method recommended by WHO to det...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-7-128
更新日期：2009-11-19 00:00:00
abstract：BACKGROUND:Anti-thyroid antibodies (ATA), even if not associated with thyroid dysfunction, are suspected to cause poorer outcome of in vitro fertilization (IVF). METHODS:We retrospectively analyzed: (a) the prevalence of ATA in euthyroid infertile women, (b) IVF outcome in euthyroid, ATA+ patients, and (c) the effect ...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-7-137
更新日期：2009-11-27 00:00:00
abstract：BACKGROUND:Embryo selection has been an integral feature of in vitro fertilization (IVF) almost since its inception. Since the advent of extended blastocyst stage embryo culture, and especially with increasing popularity of elective single embryo transfer (eSET), the concept of embryo selection has increasingly become ...
journal_title：Reproductive biology and endocrinology : RB&E
pub_type： 杂志文章
doi：10.1186/1477-7827-13-3
更新日期：2015-01-11 00:00:00
