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Biomedical subjects

C McNaughton

Publications and source records attributed to C McNaughton.

7 recordsLinked to original sources
PubMed2001

Interventions for chronic abacterial prostatitis.

BACKGROUND: Chronic abacterial prostatitis is a common disabling but enigmatic condition with a symptom complex of pelvic area pain and lower urinary tract symptoms. The scope of treatments recommended for chronic abacterial prostatitis is a testament to how little is known about what causes the condition and how to treat it. As a result, chronic abacterial prostatitis often causes physician frustration, patient confusion and dissatisfaction, variable thresholds for referral, and potentially inappropriate antibiotic use. OBJECTIVES: Examine the evidence regarding the effectiveness of therapies for chronic abacterial prostatitis. SEARCH STRATEGY: Studies were identified through a search of MEDLINE (1966-2000), the Cochrane Library, bibliographies of identified articles and reviews, and contact with an expert. SELECTION CRITERIA: Studies were eligible if they: (1) are randomized controlled trials (RCTs) or controlled clinical trials (CCTs) (2) involve men with chronic abacterial prostatitis (3) control group receives placebo, sham intervention, active pharmacologic or device therapy for chronic abacterial prostatitis and (4) outcomes data are provided. Eligibility was assessed by at least two independent observers. DATA COLLECTION AND ANALYSIS: Study information on patients, interventions, and outcomes was extracted independently by 2 reviewers. The main outcome was the efficacy of treatment for chronic abacterial prostatitis vs. control in improving urologic symptom scale scores or global report of urinary tract symptoms. Secondary outcomes included changes in the prostate examination, uroflowmetry, urodynamics, analysis of urine, expressed prostatic secretions and seminal fluid, and prostate ultrasonography. MAIN RESULTS: The 15 treatment trials involved: medications used to treat benign prostatic hyperplasia (n=4 trials); anti-inflammatory medications (n=2 trials); antibiotics (n=1 trial); thermotherapy (n=5 trials); and miscellaneous medications (n=3 trials). The disparity between studies did not permit quantitative analysis. There were a total of 600 enrollees (age range 38-45). All but one of the trials were done outside the United States. REVIEWER'S CONCLUSIONS: The treatment trials are few, weak methodologically, and involve small sample sizes. The routine use of antibiotics and alpha blockers for chronic abacterial prostatitis is not supported by the existing evidence. The small studies examining thermal therapy appear to demonstrate benefit of clinical significance and merit further evaluation. Additional treatment trials are required and they should report important patient characteristics (e.g., race), study design details and utilize clinically relevant and validated assessment measures.

Chronic Disease↗
PubMed2001

Urokinase-type plasminogen activator (uPA) and matrix metalloproteinase-9 (MMP-9) expression and activity during early embryo development in the cow.

Several extracellular matrix (ECM)-degrading proteinases are hypothesised to play important roles during early mammalian development. In particular, urokinase-type plasminogen activator (uPA) and matrix metalloproteinase 9 (MMP-9) are expressed in peri-implantation mouse, sheep, and pig embryos and are implicated in the implantation process. These proteinases are not expressed in early (pre-blastocyst) mouse, sheep or pig embryos. The aim of this study was to establish the gene expression and proteolytic activity of uPA and MMP-9 in in vitro-produced (IVP) cow embryos. Using RT-PCR, mRNA transcripts for uPA and MMP-9 were detected during the first 7 days of development. To investigate the activity of these proteinases, conditioned media from various stages of development (days 2, 3, 4, 5 and 7) were assayed for uPA activity by chromogenic assay and MMP-9 activity by gelatin zymography. Both uPA and MMP-9 activities were detected in the media samples indicating the production and secretion of these proteinases. This pattern of proteinase expression is novel in comparison to the mouse where uPA and MMP-9 are only expressed from the blastocyst stage onwards. The results of this study suggest that these ECM proteinases have a role prior to implantation in the cow, in contrast to that exhibited by mouse, sheep and pig embryos.

Animals↗
PubMed2000

The effect of pantethine and ultraviolet-B radiation on the development of lenticular opacity in the emory mouse.

PURPOSE: Few studies have examined the impact of long-term treatments or exposures on the development of cataract in maturity-onset animal models. We studied the effect of treatment with D-pantethine and exposure to ultraviolet-B (UVB) radiation on the development of lenticular opacity in the Emory mouse. METHODS: A total of 164 Emory mice were randomized by litter at weaning to exposure to UVB light at 12 mJ/cm(2) for 6 hr/day (UV) or usual room light (A), and within litter, were further randomized to bi-weekly intra-peritoneal injections of 0.8 g/kg pantethine (T) or no treatment (C). Retro illumination lens photos were taken at 2, 4, 6, 8, and 10 months after weaning, and graded in masked fashion. The animals were sacrificed at 10 months and the lenses analyzed for total pantethine and total cysteamine. RESULTS: Lens pantethine and cysteamine levels were significantly (P < 0.001) higher for the T as compared to C litters. Mean cataract grade increased monotonically over time for all four groups. Unadjusted mean grade for the AT group at 8 (1.32) and 10 (1.86) months appeared lower than for the other groups (AC: 2.17, 2.39; UVC: 1.77, 2.40; UVT: 1.88, 2.37). However, the mean grade for the pantethine-treated litters did not differ significantly from the untreated litters except at 2 months (when untreated litters had significantly lower grades), when adjusting for UV treatment, gender and litter effect. No significant difference in cataract score existed between UV-exposed and ambient litters. Mortality was higher among pantethine-treated (hazard ratio = 1.8, p = 0.05) and UV-exposed animals (hazard ratio = 1.8, p = 0. 03) than among the untreated and unexposed litters. CONCLUSION: Significantly increased lens levels of pantethine are achieved with long-term intra-peritoneal dosing. The impact of pantethine on the progression of lenticular opacity in the Emory mouse is less than has been reported in other models. This level of chronic UVB exposure appeared to have no effect on the development of cataract in this model.

Animals↗
PubMed2000

Effect of inhibitors and uncouplers of oxidative phosphorylation during compaction and blastulation of bovine embryos cultured in vitro.

The effect of inhibiting ATP production via oxidative phosphorylation during pericompaction of in vitro produced bovine embryos was investigated. This was achieved by: (i) varying the atmospheric O2 concentration (0, 1, 2, 4 and 7%); (ii) addition of oxidative phosphorylation inhibitors, NaN3 and antimycin A; and (iii) addition of 2,4-dinitrophenol, an uncoupler of oxidative phosphorylation from electron transport. The development of embryos under various O2 concentrations from day 5 to day 7 of development indicated that an optimal concentration occurred at about 2%. Addition of NaN3 revealed that doses above 100 mumol l-1 were toxic to embryo development, but that concentrations of 5-10 mumol l-1 stimulated embryo development by 10-25%. A similar result was observed after addition of 2,4-dinitrophenol, whereas antimycin A was inhibitory at doses as low as 1 mumol l-1. At concentrations of NaN3 or 2,4-dinitrophenol that stimulated embryo development, the number of cells of the resulting blastocysts was also significantly increased. Addition of NaN3 from day 1 of development inhibited subsequent development. Metabolic data of NaN3-treated embryos revealed that O2 uptake was significantly lower at inhibitory doses (100 mumol l-1). A significant (P < 0.05) log linear increase in glucose uptake was measured between the three concentrations of NaN3 (0, 10 and 100 mumol l-1). These results demonstrate that ATP production via oxidative phosphorylation is essential for bovine embryo development in vitro. However, transient (subacute) inhibition appears to be beneficial to embryo development and the number of cells, perhaps by creating a more favourable intracellular environment.

2,4-Dinitrophenol↗
PubMed1998

Antimicrobial efficacy of preservative combinations in South African brown bread.

Rope and mould spoilage decrease the shelf life of bread and may result in substantial monetary losses to producers. Five test bakes were carried out to determine the efficacy of sodium diacetate or vinegar in combination with calcium propionate, in inhibiting rope and mould spoilage of brown bread. Their effect on yeast activity was also evaluated. Baked loaves were stored at 30 degrees C and analysed for 6 days post-baking by duplicate plate counting, viable staining using 0.5% tetrazolium salt solution, mould-free shelf life determination and pH measurement. Changes in bacterial counts over time were used to rank treatments statistically. Vinegar combined with calcium propionate at 0.10% each achieved the longest rope-free shelf life, while 0.30% calcium propionate resulted in the longest mould-free shelf life. A combination of sodium diacetate and calcium propionate at 0.10% each showed the lowest reduction in yeast activity.

Acetic Acid↗
PubMed1995

Ethics of alternative therapies.

As people seek alternative therapies, the responsibility of the primary caretaker grows. This article addresses why people seek alternative therapies and discusses the ethics and challenges of the physician.

Beneficence↗