The Fallopian tubes in domestic mammals: how vital is their physiological activity?

Hunter, Richard

doi:10.1051/rnd:2005020

Cited by 89 publications

(70 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…First, P4 may alter sperm or oocyte transport by altering uterine or oviductal contractility and thus reduce fertilization (Hunter, 2005). Second, addition of P4 to in vitro fertilization (IVF) media reduced blastocyst rate (Silva and Knight, 2000) suggesting that there may be direct effects of P4 during IVF on subsequent embryo development.…”

Section: Pregnancy Loss In Dairy Cowsmentioning

confidence: 99%

Physiological and practical effects of progesterone on reproduction in dairy cattle

Wiltbank

Souza

Carvalho

et al. 2014

Animal

195

114

View full text Add to dashboard Cite

The discovery of progesterone (P4) and elucidation of the mechanisms of P4 action have an important place in the history of endocrinology and reproduction. Circulating P4 concentration is determined by a balance between P4 production, primarily by the corpus luteum (CL), and P4 metabolism, primarily by the liver. The volume of luteal tissue and number and function of large luteal cells are primary factors determining P4 production. Rate of P4 metabolism is generally determined by liver blood flow and can be of critical importance in determining circulating P4 concentrations, particularly in dairy cattle. During timed artificial insemination (AI) protocols, elevations in P4 are achieved by increasing number of CL by creating accessory CL or by supplementation with exogenous P4. Dietary manipulations can also alter circulating P4, although practical methods to apply these techniques have not yet been reported. Elevating P4 before the timed AI generally decreases double ovulation and increases fertility to the timed AI. Near the time of AI, slight elevations in circulating P4, possibly due to inadequate luteal regression, can dramatically reduce fertility. After AI, circulating P4 is critical for embryo growth and establishment and maintenance of pregnancy. Many studies have attempted to improve fertility by elevating P4 after timed AI. Our recent meta-analysis and manipulative study indicated small fertility benefits (3% to 3.5%) mostly in primiparous cows. Thus, previous research has provided substantial insight into mechanisms regulating circulating P4 concentrations and actions. Understanding this prior research can focus future research on P4 manipulation to improve reproductive success. Keywords: progesterone, lactating dairy cows, fertility ImplicationsThis manuscript reviews effects of circulating progesterone (P4) on dairy cattle reproduction. Various methods to elevate P4 during growth of the preovulatory follicular wave have been shown to increase pregnancies/ artificial insemination (AI) and reduce double ovulation, providing methods to improve fertility and reduce twinning rate in lactating dairy cattle. Conversely, very low concentrations of P4 near AI are needed to optimize fertility. Finally, elevations of P4 after AI can impact embryonic development and also may elevate fertility. Thus, innovative strategies to optimize circulating P4 concentrations during selected reproductive periods enhance our management tools for improving reproductive efficiency of lactating dairy cows. Discovery of Progesterone (P4)The discovery of P4 begins with a clear description by Regnier deGraaf (1641-1673) of the corpus luteum (CL), calling them 'globules' and correctly surmising (for rabbits) that 'the number of globules equals the number of offspring from a particular mating ' (deGraaf, 1672 in (Jocelyn andSetchell, 1972)). A key discovery came in the laboratory of Gustav Born , an excellent histologist, who observed that the CL was a ductless gland and correctly advanced the idea that it was a gland of internal sec...

show abstract

Section: Pregnancy Loss In Dairy Cowsmentioning

confidence: 99%

Physiological and practical effects of progesterone on reproduction in dairy cattle

Wiltbank

Souza

Carvalho

et al. 2014

Animal

195

114

View full text Add to dashboard Cite

show abstract

“…The human fallopian tube (named oviduct in non-primate species) is a critical organ in the female reproductive tract that naturally facilitates the transport of the cumulus-oocyte complex [COC], sperm and embryos (Hunter, 2005). The fallopian tube consists of distinct segments, including the fimbriated ends that lie adjacent to the ovary, the ampulla, the ampulla-isthmus junction and the isthmus portion (Croxatto, 2002).…”

Section: Introductionmentioning

confidence: 99%

Human fallopian tube epithelium co-culture with murine ovarian follicles reveals crosstalk in the reproductive cycle

Zhu

Rashedi

et al. 2016

Mol. Hum. Reprod.

View full text Add to dashboard Cite

STUDY QUESTION: Do interactions between human fallopian tube epithelium and murine follicles occur during an artificial reproductive cycle in a co-culture system in vitro?SUMMARY ANSWER: In a co-culture system, human fallopian tissues responded to the menstrual cycle mimetic by changes in morphology and levels of secreted factors, and increasing murine corpus luteum progesterone secretion.WHAT IS KNOWN ALREADY: The entire fallopian tube epithelium, including ciliated and secretory cells, can be regulated in the reproductive cycle. Currently, there are no in vitro culture models that can monitor fallopian tissues in real time in response to factors produced by the ovary. In addition, there are no reports on the impact of fallopian tissue on ovarian function during the menstrual cycle.STUDY DESIGN, SAMPLES/MATERIALS, METHODS: Human fallopian tissue (n = 24) was obtained by routine hysterectomies from women (aged 26-50 years, mean age = 43.6) who had not undergone exogenous hormonal treatment for at least 3 months prior to surgery. CD1 female mice were used for ovarian follicle isolation. The human fallopian epithelium layers were either co-cultured with five murine multilayer secondary follicles (150-180 μm follicles, encapsulated in one alginate gel bead) for 15 days or received stepwise steroid hormone additions for 13 days. The fallopian tissue morphology and cilia beating rate, as measured by an Andor Spinning Disk Confocal, were investigated. Oviduct-specific glycoprotein 1 (OVGP1), human insulin-like growth factor 1 (hIGF1), vascular endothelial growth factor A (VEGF-A) and interleukin 8 (IL8) as biological functional markers were measured either by ELISA or western blot to indicate dynamic changes in the fallopian epithelium during the reproductive cycle generated by mouse follicles or by stepwise steroid hormone induction. Three or four patients in each experiment were recruited for replicates. Data were presented as mean ± SD and further analyzed using one-way ANOVA followed by Tukey's multiple comparisons test. MAIN RESULTS AND THE ROLE OF CHANCE:The cultured fallopian tube epithelium responded to exogenous steroid hormone stimulation, as demonstrated by enhanced cilia beating rate (~25% increase, P = 0.04) and an increase in OVGP1 secretion (P = 0.02) in response to 1 nM estradiol (E 2 ) treatment when compared with 0.1 nM E 2 . Conversely, 10 nM progesterone plus 1 nM E 2 suppressed cilia beating rate by~30% (P = 0.008), while OVGP1 secretion was suppressed by 0.1 nM E 2 plus 50 nM progesterone (P = 0.002 versus 1 nM E 2 alone). Human fallopian tube epithelium was co-cultured with murine secondary follicles to mimic the human menstrual cycle. OVGP1 and VEGF-A secretion from fallopian tissue was similar with stepwise hormone treatment and when cultured with murine follicles. However, the secretion patterns of hIGF1 and IL8 differed in the luteal phase when comparing steroid treatment with follicle co-culture. In co-culture, hIGF1 secretion was suppressed in the luteal versus follicular phase (P = 0.005)...

show abstract

“…Only capacitated spermatozoa recognize and bind to the oocyte zona pellucida and complete the acrosome reaction (Fraser 2010). Oviducts present a complex environment involving specific signals from oviductal and follicular fluids that promote sperm capacitation (Lee et al 1976, Hunter 2005. These signals activate multiple events, including increasing intracellular calcium concentration ([Ca 2C ] i ), pH, and cAMP levels, and inducing phosphorylation of specific tyrosine residues (Visconti et al 1995, 1999, Fraser 2010.…”

Section: Introductionmentioning

confidence: 99%

Kisspeptin modulates fertilization capacity of mouse spermatozoa

Hsu¹,

Wang²,

Lee³

et al. 2014

Reproduction

View full text Add to dashboard Cite

Kisspeptin acts as an upstream regulator of the hypothalamus-pituitary-gonad axis, which is one of the main regulatory systems for mammalian reproduction. Kiss1 and its receptor Kiss1r (also known as G protein-coupled receptor 54 (Gpr54)) are expressed in various organs, but their functions are not well understood. The purpose of this study was to investigate the expression profiles and functions of kisspeptin and KISS1R in the reproductive tissues of imprinting control region mice. To identify the expression pattern and location of kisspeptin and KISS1R in gonads, testes and ovarian tissues were examined by immunohistochemical or immunofluorescent staining. Kisspeptin and KISS1R were expressed primarily in Leydig cells and seminiferous tubules respectively. KISS1R was specifically localized in the acrosomal region of spermatids and mature spermatozoa. Kisspeptin, but not KISS1R, was expressed in the cumulus-oocyte complex and oviductal epithelium of ovarian and oviductal tissues. The sperm intracellular calcium concentrations significantly increased in response to treatment with kisspeptin 10 in Fluo-4-loaded sperm. The IVF rates decreased after treatment of sperm with the kisspeptin antagonist peptide 234. These results suggest that kisspeptin and KISS1R might be involved in the fertilization process in the female reproductive tract. In summary, this study indicates that kisspeptin and KISS1R are expressed in female and male gametes, respectively, and in mouse reproductive tissues. These data strongly suggest that the kisspeptin system could regulate mammalian fertilization and reproduction.

show abstract

The Fallopian tubes in domestic mammals: how vital is their physiological activity?

Cited by 89 publications

References 31 publications

Physiological and practical effects of progesterone on reproduction in dairy cattle

Physiological and practical effects of progesterone on reproduction in dairy cattle

Human fallopian tube epithelium co-culture with murine ovarian follicles reveals crosstalk in the reproductive cycle

Kisspeptin modulates fertilization capacity of mouse spermatozoa

Contact Info

Product

Resources

About