A preliminary investigation into light-modulated replication of nanobacteria and heart disease

OBJECTIVE: The purpose of this preliminary study is to evaluate the effect of various wavelengths of light on nanobacteria (NB). BACKGROUND DATA: NB and mitochondria use light for biological processes. NB have been described as multifunctional primordial nanovesicles with the potential to utilize solar energy for replication. NB produce slime, a process common to living bacteria. Slime release is an evolutionary important stress-dependent phenomenon increasing the survival chance of individual bacteria in a colony. In the cardiovascular system, stress-induced bacterial colony formation may lead to a deposition of plaque. METHODS: Cultured NB were irradiated with NASA-LEDs at different wavelengths of light: 670, 728 and 880 nm. Light intensities were about 500k Wm(-2), and energy density was 1 x 10(4) J m(-2). RESULTS: Monochromatic light clearly affected replication of NB. Maximum replication was achieved at 670 nm. CONCLUSIONS: The results indicate that suitable wavelengths of light could be instrumental in elevating the vitality level of NB, preventing the production of NB-mediated slime, and simultaneously increasing the vitality level of mitochondria. The finding could stimulate the design of cooperative therapy concepts that could reduce death caused by myocardial infarcts.     

Comparative evaluation of three semi-quantitative radiographic grading techniques for knee osteoarthritis in terms of validity and reproducibility in 1759 X-rays: report of the OARSI-OMERACT task force

OBJECTIVE: The objective of this work was to compare the measurement properties of three categorical X-ray scoring methods of knee osteoarthritis (OA), both on semiflexed and extended views. METHODS: In data obtained from trials and cohorts, X-rays were graded using Kellgren and Lawrence (KL), the OA Research Society International (OARSI) joint space narrowing score, and measurement of joint space width (JSW). JSW was analyzed as a categorical variable. Construct validity was assessed through logistic regression between X-ray stages and Western Ontario and McMaster Universities OA Index. Inter-observer reliability was assessed in 50 subjects for extended views by weighted kappa. Intra-observer reliability and sensitivity to change were assessed separately for extended and semiflexed views in 50 patients who had both views performed, over a 30-month interval, by weighted kappa and standardized response mean (SRM). RESULTS: Extended views were available from three trials and two cohorts (1759 X-rays), including one trial in which both extended and semiflexed views (antero-posterior) were obtained. Correlation with clinical parameters was low for the three scoring methods, except for the single community-based cohort. Inter-rater reliability was higher for categorical JSW in extended views (kappa, 0.86 vs 0.56 and 0.48 for KL and OARSI, respectively). Intra-rater reliability was higher for categorical JSW, both in extended views (0.83 vs 0.61 and 0.71) and in semiflexed views (0.89 vs 0.50 and 0.67). Sensitivity to change was also higher for categorical JSW, particularly in semiflexed views (SRM, 0.49 vs 0.22 and 0.34). CONCLUSION: These results indicate categorical JSW, in particular on semiflexed views, may be the preferred method to evaluate structural severity in knee OA clinical trials.     

Measurement of serotonin 5-HT1A receptor binding using positron emission tomography and [carbonyl-(11)C]WAY-100635-considerations on the validity of cerebellum as a reference region.

[Carbonyl-(11)C]WAY-100635 has been used extensively in positron emission tomography (PET) imaging of serotonin 1A receptors (5-HT1A) in vivo in the human brain. Specific binding to receptors is usually estimated using compartmental modeling with arterial plasma input function. The use of reference tissue input (cerebellum) enables quantification without the need of arterial blood sampling, but the accuracy of this method is highly dependent on the validity of the reference region in terms of both specific and nonspecific binding. In this paper, we report exceptionally high uptake of [carbonyl-(11)C]WAY-100635 in the gray matter of cerebellum in one healthy male subject, which was reproducible in repeated PET scanning and most likely represents specific binding to 5-HT1A receptors in cerebellar gray matter. Serotonin 1A receptors are transiently expressed in the human cerebellum during early childhood and usually level off until adolescence but may persist in some individuals. As a methodological implication, the results of this study with regard to test-retest characteristics of [carbonyl-(11)C]WAY-100635 measurements in healthy volunteers using both arterial plasma and reference tissue input functions support the use of cerebellar white matter as reference region, to avoid the potential bias originating from binding of [carbonyl-(11)C]WAY-100635 to 5-HT1A receptors in cerebellar gray matter.     

Ameloblastoma: current etiopathological concepts and management

Ameloblastoma is a benign odontogenic tumor of epithelial origin. It is locally aggressive with unlimited growth capacity and has a high potential for malignant transformation as well as metastasis. Ameloblastoma has no established preventive measures although majority of patients are between ages 30 and 60 years. Molecular and genetic factors that promote oncogenic transformation of odontogenic epithelium to ameloblastoma are strongly linked to dysregulation of multiple genes associated with mitogen‐activated protein kinase, sonic hedgehog, and WNT/β‐catenin signaling pathways. Treatment of ameloblastoma is focused on surgical resection with a wide margin of normal tissue because of its high propensity for locoregional invasion; but this is often associated with significant patient morbidity. The relatively high recurrence rate of ameloblastoma is influenced by the type of molecular etiological factors, the management approach, and how early the patient presents for treatment. It is expected that further elucidation of molecular factors that orchestrate pathogenesis and recurrence of ameloblastoma will lead to new diagnostic markers and targeted drug therapies for ameloblastoma.     

How do short-term rates of femorotibial cartilage change compare to long-term changes? Four year follow-up data from the osteoarthritis initiative

OBJECTIVE: To compare unbiased estimates of short- vs long-term cartilage loss in osteoarthritic knees. METHOD: 441 knees [216 Kellgren Lawrence (KL) grade 2, 225 KL grade 3] from participants of the Osteoarthritis Initiative were studied over a 4-year period. Femorotibial cartilage thickness was determined using 3?T double echo steady state magnetic resonance imaging, the readers being blinded to time points. Because common measurement time points bias correlations, short-term change (year-1 to year-2: Y1?→?Y2) was compared with long-term change (baseline to year-4: BL?→?Y4), and initial (BL?→?Y1) with subsequent (Y2?→?Y4) observation periods. RESULTS: The mean femorotibial cartilage thickness change (standardized response mean) was?-1.2%/-0.8% (-0.42/-0.28) over 1 (BL?→?Y1/Y1?→?Y2),?-2.1%/-2.5% (-0.56/-0.55) over 2 (BL?→?Y2/Y2?→?Y4),?-3.3% (-0.63) over 3 (Y1?→?Y4), and?-4.5% (-0.78) over 4 years. Spearman correlations were 0.33 for Y1?→?Y2 vs BL?→?Y4, and 0.17 for BL?→?Y1 vs Y2?→?Y4 change. Percent agreement between knees showing progression during Y1?→?Y2 vs BL?→?Y4 was 59%, and 64% for BL?→?Y1 vs Y2?→?Y4. The area under the receiver operating characteristic curve was 0.66 for using Y1?→?Y2 to predict BL?→?Y4, and 0.59 for using BL?→?Y1 to predict Y2?→?Y4 change. CONCLUSION: Weak to moderate correlations and agreement were observed between individual short- vs long-term cartilage loss, and between initial and subsequent observation periods. Hence, longer observation periods are recommended to achieve robust results on cartilage loss in individual knees. At cohort and subcohort level (e.g., KLG3 vs KLG2 knees), the mean cartilage loss increased almost linearly with the length of the observation period and was constant throughout the study.     

In vivo morphologic comparison of saphenous vein grafts and native coronary arteries following non-ST elevation myocardial infarction

Objective

This study aimed to assess the pathophysiological differences between saphenous vein grafts (SVG) and native coronary arteries (NCA) following presentation with non-ST elevated myocardial infarction (NSTEMI).