Physiological basis for effect of physical conditioning on chronic ethanol-induced hypertension in a rat model

The study aim was to investigate the interaction of physical conditioning and chronic ethanol ingestion on blood pressure (BP), heart rate (HR), nitric oxide (NO) and oxidants/antioxidants balance in the plasma of rats. Male Fisher rats were divided into four groups of seven animals each and treated as follows: (1) Control (5% sucrose, orally) daily for 12 weeks; (2) ethanol (4 g kg⁻¹, orally) daily for 12 weeks; (3) exercise training on treadmill plus sucrose daily for 12 weeks and (4) exercise training on treadmill followed by ethanol (4 g kg⁻¹, orally) daily for 12 weeks. The body weight, BP and HR were recorded every week. The animals were sacrificed under ether anesthesia after 12 weeks, blood collected in heparinzed vials, plasma isolated and analyzed. The results show that exercise training significantly lowered the weight gain 6–12 weeks in ethanol treated rats compared to ethanol alone or control rats. The mean arterial BP was significantly elevated 6–12 weeks after ethanol ingestion without significant alterations in HR. Exercise training lowered the BP close to the normal control values in ethanol fed rats. Ethanol significantly decreased the plasma NO levels, reduced to oxidized glutathione ratio (GSH/GSSG) and antioxidant enzymes-superoxide dismutase (CuZn-SOD, and Mn-SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) activities while plasma NADPH oxidase activity and malondialdehyde (MDA) levels were significantly elevated compared to control. Exercise training significantly restored the depletion of plasma NO levels, GSH/GSSG ratio, and antioxidant enzyme activities and normalized the MDA levels and NADPH oxidase activity in the plasma of ethanol treated rats. The study concluded that physical conditioning attenuates the chronic ethanol-induced hypertension by augmenting the NO bioavailability and reducing the oxidative stress response in the plasma of rats.     

A new method to correlate histology with biomechanical properties in urethral tissue. An in-vitro study using light microscopy and scanning acoustic microscopy

When surveying the classical biomechanical theory of flow and resistance, the passive elastic properties of the urethra seems to be important for the transport of urine though the urethra. The aim of this study was to show that scanning acoustic microscopy (SAM) is a suitable methodology for investigating elastic properties of the urethra, and that it can be used to correlate elastic properties to histological areas. One 40 kg female pig and one 2 kg male rabbit comprised the material. A SAM2000 was used at a working frequency of 1000 MHz. Sections of nominal 3 micrometer thickness fixed urethral tissue were prepared for SAM and stained for light microscopy. The histological layers of the urethra were evident in the SAM image, and showed highly variable values of elastic properties. The layers seen with SAM correlated well with those seen with light microscopy. In conclusion, we have provided the first images of the microelastic properties of the urethra and correlated them to histology.     

Oral disease experience of older adults seeking oral health services

doi:10.1111/j.1741‐2358.2009.00311.x
Oral disease experience of older adults seeking oral health services Objective: The objective of this investigation was to describe the dental disease (dental caries and alveolar bone loss) experience in a sample of community‐dwelling older adults who regularly utilize dental services in New York City. Background: Public financing for dental care directed at older adults in the United States is minimal. Improved preventive methods, primarily the use of fluorides, have resulted in declines in tooth loss, and concomitant increase in risk for dental diseases among older adults. While the oral disease burden in institutionalized elderly and those unable to access services is well‐documented, the dental care needs of older adults who access dental services are not well documented. Materials and Methods: Radiographic and record review were used to determine prevalence of dental caries, alveolar bone loss, frequency of service utilization, and medical status in this cross‐sectional investigation of a sample of older adults (N = 200) using dental services at Columbia University College of Dental Medicine. Results: Only 9% of the sample was completely edentulous, the mean DMFT was 19.9 and mean alveolar bone loss was 3.6 mm. Missing and Decayed Teeth accounted for 57.8% and 6.5% of the total caries burden respectively. Missing Teeth and alveolar bone loss increased with increasing age, but there was no increase in Decayed Teeth. Conclusions: While access to and utilization of dental services may result in improved tooth retention, older adults who use dental services continue to have dental care needs, especially periodontal care needs.     

Invariant NKT cell reconstitution in pediatric leukemia patients given HLA-haploidentical stem cell transplantation defines distinct CD4+ and CD4- subset dynamics and correlates with remission state

Immune reconstitution plays a crucial role on the outcome of patients given T cell-depleted HLA-haploidentical hematopoietic stem cell transplantation (hHSCT) for hematological malignancies. CD1d-restricted invariant NKT (iNKT) cells are innate-like, lipid-reactive T lymphocytes controlling infections, cancer, and autoimmunity. Adult mature iNKT cells are divided in two functionally distinct CD4(+) and CD4(-) subsets that express the NK receptor CD161 and derive from thymic CD4(+)CD161(-) precursors. We investigated iNKT cell reconstitution dynamics in 33 pediatric patients given hHSCT for hematological malignancies, with a follow-up reaching 6 y posttransplantation, and correlated their emergence with disease relapse. iNKT cells fully reconstitute and rapidly convert into IFN-γ-expressing effectors in the 25 patients maintaining remission. CD4(+) cells emerge earlier than the CD4(-) ones, both displaying CD161(-) immature phenotypes. CD4(-) cells expand more slowly than CD4(+) cells, though they mature with significantly faster kinetics, reaching full maturation by 18 mo post-hHSCT. Between 4 and 6 y post-hHSCT, mature CD4(-) iNKT cells undergo a substantial expansion burst, resulting in a CD4(+)相似文献   

Redox active secondary metabolites

Various secondary metabolites from plants, bacteria and fungi are redox active and able to modulate the intracellular redox equilibrium in living cells. Many of these compounds behave as antioxidants, yet some of them also cause oxidative modifications, which may ultimately result in cell death. Natural isothiocyanates and xanthohumol, for instance, appear to act specifically in and against cells with a disturbed redox balance, such as certain cancer cells. Similarly, polysulfane and pyocyanin derivatives employ the glutathione antioxidant defense system of cells to generate a lethal cocktail of reactive oxygen species. Together, these redox-modulating metabolites provide promising new leads to target selectively certain cancer cells. They may also be useful in the treatment of autoinflammatory diseases.     

Priming of Nicotiana benthamiana antioxidant defences using brown seaweed extracts

Extracts from the brown seaweeds Cystoseira myriophylloides, Laminaria digitata and Fucus spiralis were evaluated as plant defence inducers against the wild fire disease of Nicotiana benthamiana. Seeds’ imbibition in aqueous seaweed extracts (SE) results in plants with reduced disease severity. In addition, bacterial populations were significantly reduced in these plants when compared to those germinated in sterile distilled water. They primed N. benthamiana for H₂O₂ accumulation and for enhanced activity of several antioxidant enzymes including catalase, ascorbate peroxidase, guaiacol peroxidase and polyphenol oxidase. These results revealed that soaking of seeds in SE before sowing allows N. benthamiana to reduce pathogen attack and can be easily applied in practice.     

Production of profibrotic cytokines by invariant NKT cells characterizes cirrhosis progression in chronic viral hepatitis

Invariant (inv)NKT cells are a subset of autoreactive lymphocytes that recognize endogenous lipid ligands presented by CD1d, and are suspected to regulate the host response to cell stress and tissue damage via the prompt production of cytokines. We investigated invNKT cell response during the progression of chronic viral hepatitis caused by hepatitis B or C virus infection, a major human disease characterized by a diffused hepatic necroinflammation with scarring fibrotic reaction, which can progress toward cirrhosis and cancer. Ex vivo frequency and cytokine production were determined in circulating and intrahepatic invNKT cells from controls (healthy subjects or patients with nonviral benign or malignant focal liver damage and minimal inflammatory response) or chronic viral hepatitis patients without cirrhosis, with cirrhosis, or with cirrhosis and hepatocellular carcinoma. invNKT cells increase in chronically infected livers and undergo a substantial modification in their effector functions, consisting in the production of the type 2 profibrotic IL-4 and IL-13 cytokines, which characterizes the progression of hepatic fibrosis to cirrhosis. CD1d, nearly undetectable in noncirrhotic and control livers, is strongly expressed by APCs in cirrhotic ones. Furthermore, in vitro CD1d-dependent activation of invNKT cells from healthy donors elicits IL-4 and IL-13. Together, these findings show that invNKT cells respond to the progressive liver damage caused by chronic hepatitis virus infection, and suggest that these cells, possibly triggered by the recognition of CD1d associated with viral- or stress-induced lipid ligands, contribute to the pathogenesis of cirrhosis by expressing a set of cytokines involved in the progression of fibrosis.