Learn More
The discovery of the amphibian skin tetradecapeptide bombesin led to the identification of several mammalian bombesin-like neuroendocrine peptides such as gastrin-releasing peptides (GRP'-27 and GRP"8-27) and neuromedin B. GRP and neuromedin B are products of two distinct genes (Krane et al., 1988). Bombesin and its homologues stimulate gastric acid(More)
Three human breast cancer cell lines ZR-75-1, MDA-MB-436 and MCF-7 were found to contain respectively, 3.06, 2.69 and 1.86 fmol of somatostatin-like immunoreactivity (SLI) per 10(6) cells. Since SLI is undetectable in the passaging media it must, therefore, be synthesised by the cells. In the presence of fetal calf serum the cells were growth inhibited by(More)
Exposure of ZR-75-1 human breast cancer cells for 48 h to human recombinant interferon alpha (IFN alpha) resulted in increased expression of oestrogen receptors as measured in a whole cell binding assay. This effect was inversely proportional to dose being significant following treatment with 10-100 IU IFN ml-1 and was only observed at a low initial cell(More)
We have investigated the production, growth and inactivation of gastrin-releasing peptide (GRP)-like peptides in human breast cancer cell lines. Radioimmunoassay detected GRP-like immunoreactivity (GRP-LI) in T47D breast cancer cells but not in the conditioned medium, indicating rapid clearance. No GRP-LI was found in the ZR-75-1 or MDA-MB-436 cells or(More)
Two neuromedin C (NC) analogues were constructed by Fmoc synthesis and in situ coupling of 4(5)-carboxyfluorescein or biotin to the N-terminus. Both displayed full agonism in an amylase release assay and cross-reacted fully with a NC-specific antiserum. Biotin NC functioned in a streptavidin-capture ELISA. Carboxyfluorescein NC was used to probe receptor(More)
A 6-month exposure of ZR-75-1 human breast cancer cells to tamoxifen (1 microM rising to 2 microM). resulted in a fall in oestrogen receptor (ER) levels from 225 fmol mg protein-1 to 56 fmol mg protein-1 while progesterone receptor (PGR) concentration fell from 63 fmol mg protein-1 to undetectable levels. Sensitivity to the anti-proliferative effects of(More)
We have determined the methylation status of the CpG island of the oestrogen receptor alpha gene in seven human ovarian cell lines. Cell lines expressing oestrogen receptor alpha showed no evidence of hypermethylation. In three of four cell lines that produced no detectable oestrogen receptor alpha protein, hypermethylation was observed at the NotI site of(More)
The fundamental importance of species in biology is refl ected in the extensive literature regarding the conceptual basis of this A large body of literature also describes empirical methods for delimiting species (e.g., Sites and Marshall, 2004). The numerous species concepts and delimita-tion methods make determining when a collection of individuals(More)
  • 1