Searchable abstracts of presentations at key conferences in endocrinology

ea0077p236 | Reproductive Endocrinology | SFEBES2021

Increased levels of testosterone associated with polycystic ovary syndrome (PCOS) negatively affect HOXA10 and integrin β3 expression in endometrial cells and embryo attachment using a trophoblast cell spheroid model

Reeves Beth , Sidat Raabiah , Harper Claire , Marriott Andrew , Charnock Jayne

PCOS is a reproductive endocrine disorder that affects up to 10% of women of a reproductive age, with 70-80% of patients defined as infertile. There are many different symptoms that could impact fertility in women with PCOS such as anovulation, hyperandrogenism and insulin resistance. A trophoblast (BeWo cell) spheroid attachment assay was used as an in vitro model of embryo implantation to examine the effect of testosterone on the receptivity of endometrial (Ishikawa...

ea0025p244 | Pituitary | SFEBES2011

BAC recombineering to understand the role of the alternative promoter in the regulation of prolactin expression

Awais Raheela , McNamara Anne , Harper Claire , Adamson Anthony , Spiller Dave , Semprini Sabrina , Mullins John , Davis Julian , White Michael R H

Alternative promoters control many genes including prolactin (PRL), which in man is expressed at extra-pituitary sites controlled by an alternative promoter located 5.8 Kbp upstream of the pituitary transcription start site. Previous studies using short promoter fragments may be misleading, as the human hPRL genomic locus has many conserved far-upstream regions. To study the function of the alternative promoter, we engineered a bacterial artificial chromosome (BAC) expressing ...

ea0021p293 | Pituitary | SFEBES2009

Long-term unsynchronised transcriptional cycles in individual living pituitary cells

Harper Claire , Finkenstadt Barbel , Woodcock Dan , Friedrichsen Sonke , Semprini Sabrina , Spiller Dave , Mullins John , Rand David , Davis Julian , White Mike

Gene expression in living cells is dynamic and unstable, and fluctuations in transcription may be subject to stochastic regulation of processes including transcription factor and polymerase recruitment, and chromatin remodelling. One gene that has been shown to display dynamically variable transcription and marked heterogeneity between cells is prolactin (PRL). Time-lapse imaging of PRL-reporter gene expression in single rat pituitary GH3 cells revealed distinct long-term tran...

ea0021p298 | Pituitary | SFEBES2009

Onset of prolactin gene transcription in nascent pituitary lactotroph cells

Featherstone Karen , Harper Claire , McNamara Anne , Semprini Sabrina , Spiller David , McNeilly Alan , Mullins John , White Michael , Davis Julian

Pituitary development, in particular the differentiation of anterior pituitary endocrine cells, remains to be fully understood, and may have implications for adult pituitary plasticity and hyperplasia. We have used prolactin-reporter transgenic rats to characterise prolactin transcription during the appearance of newly formed lactotroph cells during fetal development.Transgenic rats with the firefly luciferase reporter gene inserted into exon 1b of a 160...

ea0021p299 | Pituitary | SFEBES2009

Immuno-modulatory role of prolactin in immune tissues driven by the alternative promoter

McNamara Anne , Awais Raheela , Semprini Sabrina , Harper Claire , Featherstone Karen , Spiller Dave , Davis Julian , Mullins John , White Mike

Prolactin (PRL) is a hormone mainly produced by the lactotroph cells of the anterior pituitary gland. Besides its pivotal role in reproduction, PRL has also been found to have immuno-modulatory properties. The pituitary is the main source of circulating PRL, however it is also expressed in humans at extra-pituitary sites1. In extra-pituitary tissues, PRL mRNA contains an extra exon (exon 1a), and expression is regulated by an alternative promoter upstream of the pit...