Samuel Morrison

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The expression of myelin protein genes in Schwann cells has been studied in situ hybridization. 35S-UTP-labelled, antisense and sense RNA probes to the major protein Po, myelin basic protein (MBP), myelin-associated glycoprotein (MAG) and proteolipid protein (PLP) were employed with paraffin-embedded sections, teased fibres and dissociated Schwann cells(More)
PURPOSE To establish the presence of distinct populations of macrophages and MHC class II (Ia)-positive dendritic cells (DC) in the iris and ciliary body of the rat, mouse, and human eye. METHODS Iris-ciliary body wholemounts from a variety of rat strains, balb/c mice, and human eyes were investigated by single and double immunohistochemistry,(More)
Glial cell-line derived neurotrophic factor (GDNF) and neurturin (NTN) are structurally homologous, and they seem to produce similar effects in vitro. Tissue distributions of their respective receptors, GFR alpha-1 and GFR alpha-2, reveal overlapping but distinct patterns of expression, which implies that the in vivo actions of GDNF and NTN may be(More)
This study examines the expression of the major myelin protein gene P0 in cultured Schwann cells, grown on their own or in association with neurons. Many freshly dissociated Schwann cells from actively myelinating nerves express Po mRNA in high abundance. If neurons are not present, signal intensity falls markedly with time so that by 7 days in culture only(More)
The aims of the present study were to determine (1) the hypotensive and regional circulatory effects of centrally administered endothelin (ET) ETA and ETB agonists, and (2) the role of the sympathetic nervous system in the mediation of hypotensive effects due to centrally administered ET-1. The systemic haemodynamics and regional blood circulation in(More)
The effect of optic nerve transection on myelin protein gene expression was studied in rats following axotomy at two ages: during active myelination (17 days of age) and after peak expression of the genes (35 days of age). mRNA levels for proteolipid protein, myelin basic protein and myelin-associated glycoprotein were assessed by northern and dot blotting(More)
The expression of many myelin-specific molecules in Schwann cells is profoundly decreased following denervation. This study examines the early reexpression of myelin protein genes associated with reinnervation. Following sciatic nerve crush, the distal, regenerated nerve was divided into appropriate (2.5 or 5 mm) consecutive lengths in which gene expression(More)
Wallerian degeneration is markedly retarded in C57BL/6/Ola mice, the majority of axons remaining intact for up to 10 days after sciatic transections. By 5 days after axotomy in normal mice P0 mRNA is markedly down-regulated, whereas high expression is present in the mutant mice at 7 days and is not reduced by a second distal axotomy. However, dissociated(More)
The present study was carried out to investigate the cardiovascular effects of centrally administered SRT6b in saline, BQ123 and BMS182874 pretreated male Sprague-Dawley rats, using a radioactive microsphere technique. SRT6b (100 ng, ICV) produced a transient increase (40%) in blood pressure at 5 min followed by a sustained decrease (-42%) at 30 and 60 min(More)
Recombination-dependent alterations of their expressed pilin gene (pilE) enable gonococci to synthesize a myriad of structurally/antigenically different pili and to reversibly switch their pilus production on and off. These changes have been ascribed both to DNA transformation and to intragenomic recombination between pilE and silent pilin genes (pilS). We(More)