PAMELA J. ROBERTS

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1. In this study we describe the potent antagonist activity of a novel metabotropic glutamate (mGlu) receptor antagonist (RS)-alpha-cyclopropyl-4-phosphonophenylglycine ((RS)-CPPG) which exhibits selectivity for mGlu receptors (group II and III) negatively coupled to adenylyl cyclase in the adult rat cortex. 2. Both the L-2-amino-4-phosphonobutyrate (L-AP4)(More)
Cholestatic liver injury appears to result from the induction of hepatocyte apoptosis by toxic bile salts such as glycochenodeoxycholate (GCDC). Previous studies from this laboratory indicate that cathepsin B is a downstream effector protease during the hepatocyte apoptotic process. Because caspases can initiate apoptosis, the present studies were(More)
BACKGROUND & AIMS Cholestatic liver injury results from the intrahepatic accumulation of toxic bile salts. Toxic bile salt-induced hepatocyte apoptosis in vitro is Fas dependent. The aim of this study was to ascertain if hepatocyte apoptosis in vivo during cholestasis is Fas dependent. METHODS Studies were performed in bile duct-ligated (BDL)(More)
The sequential appearance of fibronectin and collagenous proteins was studied by immunofluorescence in experimental granulation tissue in the mouse. Granulation tissue was induced by subcutaneous implantation of viscous cellulose sponges into the neck. When sponges were invaded by granulation tissue, fibronectin appeared early together with the invading(More)
Two phenylglycine derivates, (S)-4-carboxyphenylglycine and (RS)-alpha-methyl-4-carboxyphenylglycine, competitively antagonised (1S,3R)-1-aminocyclopentane-1,3-dicarboxylate (ACPD)-stimulated phosphoinositide hydrolysis in rat cerebral cortical slices. The same phenylglycine derivatives selectively antagonized ACPD-induced depolarization in neonatal rat(More)
At present, little is known regarding the mechanism of metabotropic glutamate receptor (mGluR) trafficking. To facilitate this characterization we inserted a haemagglutinin (HA) epitope tag in the extracellular N-terminal domain of the rat mGluR1a. In human embryonic kidney cells (HEK293), transiently transfected with HA-mGluR1a, the epitope-tagged receptor(More)
A truncated form of IGF-1 which lacks the aminoterminal tripeptide Gly-Pro-Glu (GPE) is found in human brain. It was proposed that GPE may result from neural specific processing and also have a function within the CNS. GPE was synthesized and shown to inhibit glutamate binding to the N-methyl-D-aspartate (NMDA) receptor. Whilst the carboxyterminal glutamate(More)
Glutamate is known to produce many of its pre- and post-synaptic effects through interaction with at least three groups of G-protein-coupled metabotropic receptors. While molecular biological approaches have revealed a great deal about the nature of these receptors and their neuroanatomical localization, elucidation of their role in both physiological and(More)
Toxic bile salts induce hepatocyte apoptosis by a Fas-dependent, Fas ligand-independent mechanism. To account for this observation, we formulated the hypothesis that toxic bile salts induce apoptosis by effecting translocation of cytoplasmic Fas to the cell surface, resulting in transduction of Fas death signals. In McNtcp.24 cells the majority of Fas was(More)
An enzyme responsible for the NADPH-dependent reduction of nitroblue tetrazolium HCl (NBT) has been isolated from rat brain. Although other tetrazolium salts could be utilised, NBT was the preferred substrate, and the enzyme had an absolute requirement for NADPH. An in vitro assay was developed and used to determine the kinetic constants: Km NBT = 17.3(More)