Alison M. McGregor

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The mammalian gonadotropin-releasing hormone receptor (GnRH-R) is the only G-protein-coupled receptor (GPCR) in which the intracellular C-terminal tail is completely absent. In contrast to other GPCRs, the GnRH-R does not show rapid desensitization of total inositol (IP) production, and the rates of internalization are exceptionally slow. We investigated(More)
This study examined the dynamics of endocytotic and recycling events associated with the GnRH receptor, a unique G protein-coupled receptor (GPCR) without the intracellular carboxyl-terminal tail, after agonist stimulation, and investigated the role of beta-arrestin in this process. Subcellular location of fluorescently labeled epitope-tagged GnRH receptors(More)
The effects of pindolol pretreatment (2 days) on prolactin and cortisol responses to a single dose of (+)-fenfluramine (30 mg po) were examined in nine healthy male volunteers. Pindolol pretreatment attenuated the (+)-fenfluramine-induced increase in prolactin concentrations but failed to affect the (+)-fenfluramine-induced cortisol increase. These data(More)
The gonadotropin-releasing hormone receptor (GnRH-R) desensitizes following chronic exposure to GnRH or its agonists. However, it is not certain whether the GnRH-R undergoes rapid homologous desensitization analogous to other members of the G-protein coupled receptor (GPCR) superfamily. This study investigated rapid desensitization events in two cell lines(More)
The autoantigen thyroglobulin has been conjugated with the A chain of the toxin ricin. In vitro this conjugated "immunotoxin" specifically suppressed the thyroglobulin autoantibody response of lymphocytes from patients with Hashimoto's thyroiditis. Neither total immunoglobulin synthesis nor the synthesis of autoantibody to thyroid microsomes by these(More)
Organ specific autoimmune diseases are relatively common immunological disorders in man which include thyroid autoimmune disease, insulin-dependent diabetes mellitus and myasthenia gravis. The target autoantigens in some of these diseases have recently been characterised. In thyroid autoimmune disease this includes the key enzyme, thyroid peroxidase (TPO),(More)
Within a year of stopping a 6-month course of carbimazole treatment 41 of 65 patients (63%) with hyperthyroid Graves' disease had a recurrence of their hyperthyroidism. By combined analysis of the HLA-DRw3 status and the level of thyrotrophin-receptor antibody at the time of drug withdrawal relapse or remission could be predicted in 62 of the 65 patients.
Serum antibodies to the acetylcholine receptor (anti-AChR) have been reported in Japanese individuals who were elderly or had Down's syndrome at frequencies of 18% and 24%, respectively. We have measured serum anti-AChR in 3 Caucasoid groups: 53 elderly patients (aged 65-92 years) with miscellaneous (non-myasthenic) disorders, 30 individuals with Down's(More)