Forebrain ischemia in the gerbil increases lambda opiate binding in hippocampal mossy fibers

Transient forebrain ischemia was produced in gerbils by short-term occlusion of the common carotid arteries under halothane anesthesia. Histological analysis of brains 7 days post-ischemia demonstrated characteristic destruction of CA1 pyramidal cells. lambda Opiate binding (measured with [3H]naloxone in the presence of 300 nM diprenorphine) at 7 days post-ischemia was significantly increased in the stratum lucidum of the hippocampus (the mossy fiber layer), but not in any other region measured, including other hippocampal regions, cortex, amygdala, caudate putamen, thalamus, and hypothalamus. The increase in mossy fiber lambda binding was slow to develop (no increase detected up to 48 h post-ischemia), and long-lasting (binding remained elevated at 32 days post-ischemia). While MK-801 significantly inhibited CA1 pyramidal cell destruction when administered 20 min prior to ischemia, the increase in mossy fiber lambda binding was still evident. None of seven different opioid agonists and antagonists examined had an effect on either the pyramidal cell damage or increased mossy fiber lambda binding seen 7 days after ischemia.     

Localization of a gene for M?bius syndrome to chromosome 3q by linkage analysis in a Dutch family

M?bius syndrome (MIM no. 157900) consists of a congenital paresis or paralysis of the VIIth cranial nerve, frequently accompanied by paralysis of other cranial nerves, orofacial and limb malformations, defects of the musculoskeletal system and mental retardation. Although most patients are sporadic cases, familial recurrence is not rare. Different pedigrees suggest different modes of inheritance. We performed linkage analysis in a large family with autosomal dominantly inherited M?bius syndrome, consisting essentially of asymmetric bilateral facial pareses. After exclusion of the candidate region for M?bius syndrome on 13q12.2-q13, we localized the gene to chromosome 3q21-22, indicating genetic heterogeneity of M?bius syndrome. This heterogeneity is further proven by the exclusion of both loci in a second family with M?bius syndrome.     

Palmtop computerized reminding devices: The effectiveness of the temporal properties of warning signals

An intention requires us to carry out an action at a certain time or in an unscheduled time frame. In recent years, palmtop computerized devices with special functions have been developed that enable individuals to better remember their intentions. People record their intention in the device and are later reminded of their intention by a warning signal, such as an audible beep, that is presented along with a message about what is to be done. The present research investigated the psychological effects of the warning signals provided by palmtop reminding devices. Four experiments demonstrated that the effectiveness of an audible warning signal in the form of a signal was greatest early in the day. The interval between the signal and time to carry out the act, called here the anticipatory lag, did not significantly influence the timeliness of responses and remembering.     

Brief report: parenting stress and quality of life during treatment for childhood leukemia predicts child and parent adjustment after treatment ends

Evaluated relationships between parenting stress and parent-rated child quality of life during treatment for childhood leukemia and later parental posttraumatic stress symptoms and parent and child anxiety after completion of cancer treatment in 29 families of patients with leukemia. Correlations among in-treatment and off-treatment variables showed strong patterns of association between parenting stress during treatment and later parental adjustment, for both mothers and fathers. Parent-rated child quality of life was also significantly associated with later adjustment for mothers and children. Despite the small sample, data point to the importance and consistency of parental reactions from diagnosis through the end of treatment and have clinical implications for psychosocial services during and after treatment.     

Structural insight into the binding motifs for the calcium ion and the non-catalytic zinc in matrix metalloproteases

The binding motifs for the structural zinc and calcium ions in matrix metalloproteases (MMPs) were investigated by analyzing the three-dimensional structural models of 23 representative MMPs.     

Correlation analysis of twin data with repeated measures based on generalized estimating equations

Repeated measures allow additional tests of common assumptions in twin correlation analysis. Analysis of log serum triglyceride level in NHLBI male twins using generalized estimating equations disclosed that the mean and variance shifted across exams, presumably because of changes in laboratory practice.     

The HELLP syndrome: its association with unexplained elevation of MSAFP and MShCG in the second trimester

In this study, we examined the relationship between concentrations of maternal serum alpha-fetoprotein (MSAFP) and maternal serum human chorionic gonadotropin (MShCG) in the second trimester and the haemolysis, elevated liver enzymes, low platelet count (HELLP) syndrome. The concentrations of both serum markers, expressed in multiples of the median (MOM), in 16 women with the HELLP syndrome were compared with those in 10443 women without this syndrome who were screened for Down's syndrome and neural tube defects. All the women with a singleton pregnancy and a known pregnancy outcome were included in this study. At a cut-off level of 2.5 MOM, 37.5 per cent of the pregnancies with the HELLP syndrome had an elevated MShCG level, compared with 4.8 per cent in the whole population (P < 0.0001). 12.5 per cent of the women with the HELLP syndrome had an elevated MSAFP level, compared with 1.3 per cent in the whole population (P < 0.025). Women with a combined elevation of MSAFP and MShCG levels (0.3 per cent of the screened population) had a 47 time greater risk of developing the HELLP syndrome than the others (P < 0.01). The HELLP syndrome should be taken into account in the case of unexplained elevated levels of MShCG and MSAFP, especially in the rare event of combined elevation of both markers.     

Exhaled nitric oxide is not elevated in the inflammatory airways diseases of cystic fibrosis and bronchiectasis

Airways inflammation has been associated with increased nitric oxide (NO) in the exhaled breath. It was, therefore, questioned whether exhaled NO could act as an indicator of the severity of airways inflammation in the chronic suppurative lung diseases cystic fibrosis (CF) and bronchiectasis. NO levels in a single exhalation were measured using a chemiluminescence analyser. Thirty-six patients with CF and 16 with bronchiectasis were studied and compared with 22 normal subjects and 35 asthmatic patients. All subjects were nonsmokers and all measurements were made when patients were clinically stable. In addition, exhaled NO was measured in 10 CF patients at the time of onset of an acute infective exacerbation and followed for 7 days during the treatment of the exacerbation in eight of the 10 patients. No significant differences were found in NO levels in patients with CF or bronchiectasis compared with normals (median 4.0, 5.5 and 4.4 parts per billion (ppb), respectively), but all were lower than in asthma patients (10.4 ppb). The NO levels in the CF patients at time of exacerbation were not increased and did not change during treatment. These data show that nitric oxide levels in the exhaled breath of patients with chronic suppurative lung diseases, in contrast to asthma, are not elevated, despite the presence of substantial airways inflammation. Possible explanations include poor diffusion of nitric oxide across increased and viscous airway secretions, removal of nitric oxide by reaction with reactive oxygen species in the inflamed environment and failure of upregulation of epithelial inducible nitric oxide synthase in chronic suppurative conditions.