George P Brown

Learn More
Long-term potentiation (LTP) at the Schaffer collateral-CA1 synapse involves interacting signaling components, including calcium (Ca2+)/calmodulin-dependent protein kinase II (CaMKII) and cyclic adenosine monophosphate (cAMP) pathways. Postsynaptic injection of thiophosphorylated inhibitor-1 protein, a specific inhibitor of protein phosphatase-1 (PP1),(More)
Antisense oligodeoxynucleotides (18-20 bases) to a cloned delta opioid receptor (DOR-1) lower delta binding in NG108-15 cells by 40%-50%. Changing 4 bases to generate a mismatch antisense oligodeoxynucleotide or mixing the corresponding sense and antisense oligodeoxynucleotides prior to treatment of the cells eliminates the inhibition of binding, confirming(More)
The rapid metabolism of heroin to 6-acetylmorphine and its slower conversion to morphine has led many to believe that heroin and morphine act through the same receptors and that the differences between them are due to their pharmacokinetics. We now present evidence strongly implying that heroin and two potent mu drugs, fentanyl and etonitazine, act through(More)
Long-term potentiation (LTP) can be induced in the Schaffer collateral-->CA1 synapse of hippocampus by stimulation in the theta frequency range (5-12 Hz), an effect that depends on activation of the cAMP pathway. We investigated the mechanisms of the cAMP contribution to this form of LTP in the rat hippocampal slice preparation. theta pulse stimulation(More)
Although MOR-1 encodes a mu opioid receptor, its relationship to the pharmacologically defined mu receptor subtypes has been unclear. Antisense mapping now suggests that these subtypes result from alternative splicing of MOR-1. Three oligodeoxynucleotide probes targeting exon 1 and another oligodeoxynucleotide directed against the coding region of exon 4(More)
Morphine-6beta-glucuronide (M6G) is a potent morphine metabolite. In an effort to further explore its mechanisms of action, we synthesized 3H-M6G of high specific activity and examined its binding. Although its affinity toward traditional mu receptors is similar to morphine in binding assays in brain and in Chinese hamster ovary cells stably transfected(More)
Recent work has suggested that heroin and morphine-6beta-glucuronide (M6G) both act through a novel mu opioid receptor subtype distinct from those mediating morphine's actions. This very high affinity 3H-M6G site is selectively competed by 3-methoxynaltrexone. In vivo, 3-methoxynaltrexone (2.5 ng, i.c.v.) selectively antagonizes the analgesic actions of(More)
Little experimental data exist regarding the comparative biomechanical of various foot orthoses. This study evaluated the comparative effect of biomechanical orthoses and over-the-counter arch supports on controlling rearfoot pronation. Twenty-four patients with forefoot varus deformity were studied while walking on a treadmill. Two-dimensional, videotape(More)
There is evidence that angiotensin II has a direct effect on reabsorptive processes of the kidney that are mediated by angiotensin II receptors on the proximal tubules. These receptors have not previously been localized to luminal brush border or basolateral membranes. The present study is the first to characterize the angiotensin II receptor of rat renal(More)
Angiotensin II (angio II) receptors have been compared using tissues from aldosterone-producing adenomas (APAs), adjacent nontumorus tissue, and normal human adrenal glomerulosa. Plasma membrane-rich subcellular fractions were employed in a radioreceptor assay with [125I]angio II. In vitro aldosterone secretory response to angio II were determined using(More)