2323 W Front St
Tyler TX 75702
Medical School: Other - 1977
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #: F4694
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*These referrals represent the top 10 that Dr. Wilson has made to other doctors
Nitric oxide targets oligodendrocytes and promotes their morphological differentiation. - Glia
In the central nervous system, nitric oxide (NO) transmits signals from one neurone to another, or from neurones to astrocytes or blood vessels, but the possibility of oligodendrocytes being physiological NO targets has been largely ignored. By exploiting immunocytochemistry for cGMP, the second messenger generated on activation of NO receptors, oligodendrocytes were found to respond to both exogenous and endogenous NO in cerebellar slices from rats aged 8 days to adulthood. Atrial natriuretic peptide, which acts on membrane-associated guanylyl cyclase-coupled receptors, also raised oligodendrocyte cGMP in cerebellar slices. The main endogenous source of NO accessing oligodendrocytes appeared to be the neuronal NO synthase isoform, which was active even under basal conditions and in a manner that was independent of glutamate receptors. Oligodendrocytes in brainstem slices were also shown to be potential NO targets. In contrast, in the optic nerve, oligodendrocyte cGMP was raised by natriuretic peptides but not NO. When cultures of cerebral cortex were continuously exposed to low NO concentrations (estimated as 40-90 pM), oligodendrocytes responded with a striking increase in arborization. This stimulation of oligodendrocyte growth could be replicated by low concentrations of 8-bromo-cGMP (maximum effect at 1 ÂµM). It is concluded that oligodendrocytes are probably widespread targets for physiological NO (or natriuretic peptide) signals, with the resulting rise in cGMP serving to enhance their growth and maturation. NO might help coordinate the myelination of axons to the ongoing level of neuronal activity during development and could potentially contribute to adaptive changes in myelination in the adult.Â© 2014 The Authors. Glia Published by Wiley Periodicals, Inc.
InÂ vitro efficacy of cefovecin against anaerobic bacteria isolated from subgingival plaque of dogs and cats with periodontal disease. - Anaerobe
Periodontal disease is a common disease of dogs and cats often requiring antimicrobial treatment as an adjunct to mechanical debridement. However, correct compliance with oral antimicrobial therapy in companion animals is often difficult. Cefovecin is a recently introduced veterinary cephalosporin that has demonstrated prolonged concentrations in extracellular fluid, allowing for dosing intervals of up to 14 days. Subgingival samples were collected from the oral cavity of 29 dogs and eight cats exhibiting grade 2 or grade 3 periodontal disease. Samples were cultivated on Wilkin Chalgrens agar and incubated in an anaerobic chamber for seven days. Selected anaerobic bacteria were isolated and identified to species level using 16S rRNA gene sequence analysis. Minimum inhibitory concentrations were determined for cefovecin and six additional antimicrobials using the agar dilution methodology recommended by the Clinical and Laboratory Standards Institute. The 65 clinical isolates were identified as Porphyromonas gulae (nÂ =Â 45), Porphyromonas crevioricanis (nÂ =Â 12), Porphyromonas macacae (nÂ =Â 1), Porphyromonas cangingivalis (nÂ =Â 1) Fusobacterium nucleatum (nÂ =Â 2), Fusobacterium russii (nÂ =Â 1) and Solobacterium moorei (nÂ =Â 3). This is the first report of S.Â moorei being isolated from companion animals with periodontal disease. All isolates were highly susceptible to cefovecin, with a MIC90 of â‰¤0.125Â Î¼g/ml. Conversely, different resistance rates to ampicillin, amoxicillin and erythromycin between isolates were detected. Cefovecin is thus shown to be effective inÂ vitro against anaerobic bacteria isolated from dogs and cats with periodontal disease.Copyright Â© 2014 Elsevier Ltd. All rights reserved.
Optimized method for quantification of total F(2)-isoprostanes using gas chromatography-tandem mass spectrometry. - Journal of pharmaceutical and biomedical analysis
F2-isoprostanes are produced from the oxidative degradation of arachidonic acid and are considered the gold standard marker of lipid peroxidation in biological samples. We developed a liquid-liquid extraction method for the determination of total isoprostanes using negative chemical ionization gas chromatography-tandem mass spectrometry in plasma and tissue homogenates. Incorporating liquid-liquid extraction allows for greater sample through-put than current approaches. Here we describe the protocol and include numerous trouble-shooting suggestions. The method found healthy individuals with 150-250 pg of isoprostanes per ml of plasma and end stage kidney disease patients to have the highest measured values of up to 1100 pg/ml. This assay has an accurate working linear range of 40-1000 pg of isoprostanes (100-2500 pg/ml) and an average coefficient of variance of 7%. Tissue values for healthy mice liver were 50-70 pg/Î¼g protein. This method provides increased ion selectivity and detection capabilities with economical sample through-put.Copyright Â© 2013 Elsevier B.V. All rights reserved.
Non-coding-regulatory regions of human brain genes delineated by bacterial artificial chromosome knock-in mice. - BMC biology
The next big challenge in human genetics is understanding the 98% of the genome that comprises non-coding DNA. Hidden in this DNA are sequences critical for gene regulation, and new experimental strategies are needed to understand the functional role of gene-regulation sequences in health and disease. In this study, we build upon our HuGX ('high-throughput human genes on the X chromosome') strategy to expand our understanding of human gene regulation in vivo.In all, ten human genes known to express in therapeutically important brain regions were chosen for study. For eight of these genes, human bacterial artificial chromosome clones were identified, retrofitted with a reporter, knocked single-copy into the Hprt locus in mouse embryonic stem cells, and mouse strains derived. Five of these human genes expressed in mouse, and all expressed in the adult brain region for which they were chosen. This defined the boundaries of the genomic DNA sufficient for brain expression, and refined our knowledge regarding the complexity of gene regulation. We also characterized for the first time the expression of human MAOA and NR2F2, two genes for which the mouse homologs have been extensively studied in the central nervous system (CNS), and AMOTL1 and NOV, for which roles in CNS have been unclear.We have demonstrated the use of the HuGX strategy to functionally delineate non-coding-regulatory regions of therapeutically important human brain genes. Our results also show that a careful investigation, using publicly available resources and bioinformatics, can lead to accurate predictions of gene expression.
Variability in oxidative stress biomarkers following a maximal exercise test. - Biomarkers : biochemical indicators of exposure, response, and susceptibility to chemicals
The oxidative stress response to maximal exercise may provide useful clinical biomarkers for assessing redox homeostasis. The aim was to determine the between-individual variability in the exercise-induced change in oxidative stress measures and investigate predictors of these responses. Plasma F2-isoprostanes (Isop), protein carbonyls (PCs), glutathione peroxidase (GPX) activity and total antioxidant capacity (TAC) were measured before and after a maximal treadmill exercise test. Exercise produced significant increases in Isop (27.0%), PC (6.2%) and GPX (7.8%). There were large between-individual coefficients of variation: Isop (152%), PC, (240%), GPX (130%) and TAC (243%).
Micronutrient, antioxidant, and oxidative stress status in children with severe cerebral palsy. - JPEN. Journal of parenteral and enteral nutrition
Markers indicative of micronutrient and antioxidant status in children with cerebral palsy (CP) were explored due to these children's well-documented issues with food intake and the limited biochemical literature.Children aged 4 to 12 years with marked CP (n = 24) and controls (n = 24) were recruited. The CP group represented orally (O) or enterally fed (E) children. Concentrations of red cell folate (RCF), magnesium, superoxide dismutase (SOD), glutathione reductase, and peroxidase were measured, as well as serum methylmalonic acid and vitamin C. Plasma hemoglobin, C-reactive protein, Î±-tocopherol, cholesterol, zinc, protein carbonyls, and total antioxidant capacity were also quantified.Data are reported as mean (SD) and z scores where values differ with age. Many similarities existed, but zinc z scores were reduced in O (-1.10 [0.83]) vs controls (-0.54 [0.54]) (P < .05), as well as for glutathione reductase in O (10.15 [1.69]) vs E (12.22 [2.41]) and controls (11.51 [1.67]) (P < .05). RCF was greatly increased in E (1422 ) vs O (843 ) and controls (820 ) (P < .001). SOD was decreased in E (24.3 [1.4]) vs controls (27.0 [2.8]) (P < .05).Considering their vast impact on physiology, micronutrients should be routinely monitored in orally fed children with swallowing disorders and dietary limitations. Excessive intakes, particularly long term in enterally fed children, should also be monitored in view of their potential for competitive inhibition, particularly at high levels.
The development of an oral health charting system for koalas (Phascolarctos cinereus). - Journal of veterinary dentistry
The koala is one of Australia's most highly specialized folivores with a diet exclusively of eucalyptus leaves to provide all nutritive needs and therefore requires to be free of oral disease as they are dependent on good dentition for optimal health and quality of life. We developed an oral examination methodology based on protocols for companion animals and human dentistry to chart the oral health of koalas. Thirty free-ranging koalas from South-East Queensland, Australia were examined for general body and oral health. Inspection of the oral cavity was conducted for the presence or absence of the indicators oforal disease such as caries or periodontal disease. Univariate and multivariate analyses were performed on the examination data and a prototype oral health chart developed. The prototype was then trialled and the methodology validated by the Kappa statistic using ten additional koalas examined by four multidisciplinary personnel involved in koala care. Trauma associated fractures, tooth displacement, abnormal occlusion and tooth wear compacted vegetation, extrinsic stain deposits, periodontal bone loss, gingivitis, tooth mobility, and calculus were present in the oral cavities of the examined koalas. A system of scoring between 0 and 3 was constructed in accordance with current koala general health charting formats. Validation of the charting method using Kappa coefficients of agreement statistics indicated that there was a good agreement among observers on recorded results except for inflammation and calculus scoring. Modifications were made and visual aids and index scales produced to further assist observers. Oral health surveillance has been proven in other species to be significant in diagnosing physiological disturbances derived from environmental genetic, and developmental causes. Veterinarians, dental researchers, and koala husbandry personnel will benefit in using this charting method and reporting the oral health of koala populations in their future findings. This unique form of oral health monitoring would be adaptable to other mammals.
Unusual Reactivity of a Potent Platinum-Acridine Hybrid Antitumor Agent. - ACS medicinal chemistry letters
The formation of unusual seven-membered, sterically overloaded chelates [Pt(en)(L/LÂ´)](NO(3))(2) (4a/4b) from the corresponding potent hybrid antitumor agents [PtCl(en)(LH/LÂ´H)](NO(3))(2) (3a/3b) is described, where en is ethane-1,2-diamine and L(H) and LÂ´(H) are (protonated) N-(2-(acridin-9-ylamino)ethyl)-N-methylpropionimidamide and N-(2-(acridin-9-ylamino)ethyl)-N-methylacetimidamide, respectively. Compounds 3a and 3b inhibit H460 lung cancer cell proliferation with IC(50) values of 12 Â± 2 nM and 2.8 Â± 0.3 nM, respectively. The new derivative 3b proves to be not only the most cytotoxic platinum-acridine hybrid of this kind, but also one of the most potent platinum-based anticancer agents described to date. The chelates 4a and 4b do not undergo ligand substitution reactions with nucleobase nitrogen and cysteine sulfur and do not intercalate into DNA. Despite their inertness, the two chelates appear to maintain micromolar activity in H460 cells. The results are discussed in the context of potential DNA-mediated and DNA-independent cell kill mechanisms and the potential use of the chelates as prodrugs.
Effect of co-administration of varenicline and antidepressants on extracellular monoamine concentrations in rat prefrontal cortex. - Neurochemistry international
Since a substantial proportion of smokers have comorbid mood disorders, the smoking cessation aid varenicline might occasionally be prescribed to patients who are simultaneously treated with antidepressants. Given that varenicline is a selective nicotinic acetylcholine receptor partial agonist and not a substrate or inhibitor of drug metabolizing enzymes, pharmacokinetic interactions with various classes of antidepressants are highly unlikely. It is, however, conceivable that varenicline may have a pharmacodynamic effect on antidepressant-evoked increases in central monoamine release. Interactions resulting in excessive transmitter release could cause adverse events such as serotonin syndrome, while attenuation of monoamine release could impact the clinical efficacy of antidepressants. To investigate this we examined whether varenicline administration modulates the effects of the selective serotonin reuptake inhibitor sertraline and the monoamine oxidase inhibitor clorgyline, given alone and combined, on extracellular concentrations of the monoamines serotonin, dopamine, and norepinephrine in rat brain by microdialysis. Given the important role attributed to cortical monoamine release in serotonin syndrome as well as antidepressant activity, the effects on extracellular monoamine concentrations were measured in the medial prefrontal cortex. Responses to maximally effective doses of sertraline or clorgyline and of sertraline plus clorgyline were the same in the absence as in the presence of a relatively high dose of varenicline, which by itself had no significant effect on cortical monoamine release. This is consistent with the binding profile of varenicline that has insufficient affinity for receptors, enzymes, or transporters to inhibit or potentiate the pharmacologic effects of antidepressants. Since varenicline neither diminished nor potentiated sertraline- or clorgyline-induced increases in neurotransmitter levels, combining varenicline with serotonergic antidepressants is unlikely to cause excessive serotonin release or to attenuate antidepressant efficacy via effects on cortical serotonin, dopamine or norepinephrine release.Copyright Â© 2010 Elsevier Ltd. All rights reserved.
A regulatory toolbox of MiniPromoters to drive selective expression in the brain. - Proceedings of the National Academy of Sciences of the United States of America
The Pleiades Promoter Project integrates genomewide bioinformatics with large-scale knockin mouse production and histological examination of expression patterns to develop MiniPromoters and related tools designed to study and treat the brain by directed gene expression. Genes with brain expression patterns of interest are subjected to bioinformatic analysis to delineate candidate regulatory regions, which are then incorporated into a panel of compact human MiniPromoters to drive expression to brain regions and cell types of interest. Using single-copy, homologous-recombination "knockins" in embryonic stem cells, each MiniPromoter reporter is integrated immediately 5' of the Hprt locus in the mouse genome. MiniPromoter expression profiles are characterized in differentiation assays of the transgenic cells or in mouse brains following transgenic mouse production. Histological examination of adult brains, eyes, and spinal cords for reporter gene activity is coupled to costaining with cell-type-specific markers to define expression. The publicly available Pleiades MiniPromoter Project is a key resource to facilitate research on brain development and therapies.
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2323 W Front St Tyler, TX 75702
910 E Houston St
520 Douglas Blvd