Glutathione peroxidase, glutathione reductase, Cu-Zn superoxide dismutase activities, glutathione, nitric oxide, and malondialdehyde concentrations in serum of patients with chronic lymphocytic leukemia

BACKGROUND: Chronic lymphocytic leukemia (CLL) is a rare neoplasm that comprises a substantial proportion of all leukemias in middle-aged persons and is the most common type among elderly persons. The major causes are not known nor is there a detailed understanding about how the elusive origin(s) may relate to clinical expression, basic biological mechanisms, or pathogenesis. METHODS: Glutathione peroxidase (GSH-Px), glutathione reductase (GRD), Cu-Zn superoxide dismutase (Cu-Zn SOD) activities, glutathione (GSH), nitric oxide (NO(*), and malondialdehyde (MDA) concentrations were measured in serum of patients with CLL and a healthy control group. RESULTS: Serum GSH-Px, Cu-Zn SOD activities, GSH concentration were lower in patients with CLL while serum NO(*) and MDA concentrations were higher in these patients compared with the control group. Serum GRD activity was not statistically significant in patients with CLL compared with the control. However, there was no statistically significant difference in the parameters on the basis of stages in these patients. Serum GSH concentration negatively correlated with serum MDA (r=30.63, p<0.05) and NO(*) concentrations (r=0.72, p<0.05) in patients with advanced stage (III+IV). However, no other correlation could be found among the parameters in healthy controls and patients with CLL CONCLUSIONS: There is significant changes in antioxidant defense system in CLL cases, which may lead to enhanced action of oxygen radical, resulting in lipid peroxidation.     

Knowledge and behaviours related to herbal remedies: a cross‐sectional epidemiological study in adults in Middle Anatolia,Turkey

The use of herbal remedies is common in Turkey. This study aimed to define the patterns of herbal remedy use among subjects aged 18 or above and to describe factors associated with use of herbal remedies. A cross‐sectional study was conducted with a multistage sampling method between September 2007 and April 2008. A total of 3876 adults participated (98.1% response rate), and 1518 (39.2%) admitted using herbal remedies (95% CI 37.6–40.7%). Univariate analyses showed that compared with non‐users, herbal users were mostly female, were more highly educated and were more likely to live in smaller households of one to four people. Logistic regression showed that being aged 18–27 (OR = 1.23, P = 0.028), being female (OR = 2.22, P < 0.001), being educated in a secondary school (OR = 1.47, P < 0.001) or high school (OR = 2.77, P < 0.001), perceiving their health status as ‘good’ (OR = 2.61, P < 0.001) and having health‐related problems (OR = 2.80, P < 0.001) were the factors associated with the use of herbal remedies. The most commonly used herbs were lime, mint, rosehip and lemon. The reasons for using herbal remedies included that they are natural products (79.8% of the 1518 users), for health enhancement (58.9%) and to overcome health problems (32.2%). The decision to use herbal remedies was mainly based on recommendations from the mass media (45.1%). Only 29.1% of users obtained information from their physicians or health providers, and only 37.9% informed their doctors. Nearly three in five people in this study reported using a herbal remedy to overcome health problems or for health enhancement. Herbal remedies are likely to be used by the young people, females, those with higher education, those with good or excellent perceived health status and those with chronic illness, and it seems essential to offer informational programmes for them. The lack of communication on herbal remedies between patient and physician needs to be addressed.     

Isthmic spondylolysis of the lumbar spine: MR imaging at 1.5 T

The appearance on magnetic resonance (MR) images of the normal pars interarticularis in 13 patients was reviewed and contrasted with that of the pars in eight patients with spondylolysis. The pars defect usually had an intermediate signal intensity with all pulse sequences; however, this intensity was somewhat variable depending on the exact ratio of cartilage, fat, and fluid within each bone defect. The pars defect was best seen with spin-echo 600/20 (repetition time msec/echo time msec) images. In three cases, out-of-phase images showed the spondylolysis best, because of extension of fat to the borders of the defect. The sagittal view allowed one to separate spondylolysis from the joint space of posterior facets since the orientation of the defects is perpendicular to the facets; thus, a common pitfall encountered with cross-sectional axial imaging techniques is avoided. MR imaging poorly delineated bone fragments around the defect, which may produce nerve root impingement, but revealed other numerous complications that occur with spondylolysis, including spondylolisthesis and herniation of the disk above.     

Stability of cucurbitacin E in human plasma: chemical hydrolysis and role of plasma esterases

It was shown previously that the anticancerous cytotoxic oxygenated triterpenes, cucurbitacin E (Cuc E) and its deacetylated form, cucurbitacin I (Cuc I), interacted differently with human serum albumin. In this study, the biochemical stability of Cuc E was investigated in vitro by reverse‐phase high performance liquid chromatography. The hydrolysis rate in acidic and alkaline solutions, and in enzymatic conditions in human plasma and in purified plasma esterase solutions of butyrylcholinesterase and albumin, was compared with that measured in phosphate buffer saline (pH 7.4). Cuc E hydrolysis was detected in all the in vitro tests, but the extent of hydrolysis varied according to the different enzymatic and non‐enzymatic conditions. A remarkable rapid hydrolysis of Cuc E was detected in acidic and alkaline solutions. A significant rate of hydrolysis of Cuc E was monitored in human plasma and was associated with the detection of Cuc I. The stability of Cuc E was greatly enhanced in the presence of albumin. However, purified butyrylcholinesterase had no effect on Cuc E stability. Among specific inhibitors of plasma esterases, only EDTA increased Cuc E stability, suggesting that paraoxonase is the human plasma esterase involved in the hydrolysis of Cuc E. Copyright © 2009 John Wiley & Sons, Ltd.     

几种超短肽的抗抑郁作用

超短肽(overshort peptides,简称OSP)是一类由2～4个氨基酸组成的活性肽,存在于体内,参与多方面的生理、生化或病理过程,其中有些OSP分布于CNS,可能参与情感等高级神经活动的调节。为了探讨OSP可能的药用前景,我们对其中5个OSP进行了抗抑郁作用研究。     

Defined epitope blocking with Murray Valley encephalitis virus and monoclonal antibodies: laboratory and field studies.

In an attempt to develop a specific serological test for Murray Valley encephalitis (MVE) virus antibodies, a panel of MVE monoclonal antibodies was utilised in defined-epitope blocking ELISA tests. In sera of mice immunised singly and in combinations of MVE, Alfuy (ALF), and Kunjin (KUN) viruses, blocking patterns usually distinguished MVE infections from those of the other flaviviruses. When blocking tests with selected MAbs were applied to 468 flavivirus antibody positive sera collected from human subjects throughout New South Wales, sera with blocking patterns consistent with previous MVE infection were found in 18 subjects. All were long-term residents of areas previously frequented by MVE, and all were of an age to have been exposed to the virus in past epidemics. No such sera were found in subjects living in coastal areas of NSW where MVE has never been reported.