Vitamin D related knowledge, attitudes and behaviors among ethnic minority women

Background

Vitamin D (VD) deficiency may increase the risk of developing nutritional rickets, metabolic, autoimmune, infectious, cardiovascular and mental disorders. VD status in reproductive age is of special importance, as it may determine health outcomes not only for women but also for their offspring. Danish health authorities recommend VD supplementation for groups at risk of VD deficiency. In Nordic countries, persistent high prevalence of VD deficiency among non-Western ethnic minority women suggests that health information may not reach the population in need.

Aim

to assess VD related knowledge, attitudes and behaviors among non-Western ethnic minority women living in Denmark in 2019.

Methods

A validated VD knowledge, attitudes and behaviors questionnaire was translated into Danish, piloted and distributed via relevant Facebook groups using online SurveyXact platform. The responses were analyzed with SPSS statistical package, using both parametric and non-parametric tests for bivariate analyses.

Results

254 women who considered themselves having a non-Western ethnic minority background answered the questionnaire. Median age (IQR) was 26 (23-33) year old; 81 (39%) had professional, 71 (28%) high school and 56 (22%) university education. Age was associated with VD nutrition knowledge (p = 0.048) and VD behaviors (p = 0.026): older women had better knowledge about VD rich nutrition and reported more VD friendly behavior. Education was associated with both VD general (p = 0.034) and VD nutrition (p = 0.034) knowledge. Women with university education had better knowledge about VD generally, and women with professional education had better knowledge about VD rich nutrition.

Conclusions

Aged and education were associated with VD related knowledge and behaviors in young women with non-Western ethnic minority women. Further examining of VD related knowledge and behaviors focusing among less populations is warranted.

Key messages

Education was associated with both vitamin D general (p = 0.034) and vitamin D nutrition (p = 0.034) knowledge. Aged and education were associated with vitamin D related knowledge and behaviors in young women with non-Western ethnic minority women.

Prevalence of nocturia and fecal and urinary incontinence and the association to childhood obesity: a study of 6803 Danish school children

INTRODUCTION

Fecal and urinary incontinence are common disorders in children. Obesity and its associated comorbidities have become increasingly common, and a relation between obesity, nocturia, incontinence, and nocturnal enuresis has been suggested.

OBJECTIVE

This large scale population study aims to determine the prevalence of fecal incontinence (FI), daytime urinary incontinence (DUI), nocturnal enuresis (NE), and nocturia in children at school entry and in adolescence and to clarify whether obesity is associated to any of the aforementioned symptoms.

STUDY DESIGN

First-grade children and their parents and adolescents in the seventh to ninth grades were interviewed in relation to school nurse visits. The interview included questions on whether incontinence or nocturia were experienced at least once per month. The participants' age was recorded, and weight and height were measured. Body mass index (BMI) was calculated and age standardized by the use of BMI-standard deviation score (SDS), with reference to World Health Organization normative BMI data. Obesity was defined as BMI-SDS >2. Associations between obesity and incontinence and nocturia were quantified by odds ratio (OR).

RESULTS

Completed interview questionnaires and measurements were obtained from 4002 children (95.1%) in the child population and 2801 adolescents (84.4%) in the adolescent population. The mean age of children was 6.45 ± 0.39 years, and 4.4% were obese. Overall 11.2% reported FI, 21.8% DUI, 16.8% NE, and 31.4% experienced nocturia. Obesity was associated with FI in first-grade boys (OR 1.86 compared with normal weight). Mean age of adolescents was 13.9 ± 0.85 years, and 7.6% of adolescent boys and 5.5% of the girls were obese. Fecal incontinence was reported by 2.1% of the adolescents, 4.5% had DUI, 1.0% stated to have NE, and 32.3% reported nocturia. Obesity was significantly associated with nocturia in adolescents (OR 1.74-2.01).

DISCUSSION

The prevalence of nocturia seems constant throughout childhood and adolescent life; this has not previously been documented. Incontinence is very common at school entry, with DUI reported more frequently than enuresis by both children and adolescents. Obesity is associated with nocturia in adolescents and FI in first-grade boys, but no significant association between obesity and NE or DUI is found. Strength of this study is the very high participation rates, but the study does not reveal information on previous treatment, subtype, or severity of symptoms.

CONCLUSIONS

Incontinence is very common in children. One-third of both children and adolescents experience nocturia. Obesity is associated with FI in first-grade boys and nocturia in adolescents.

Increasing the quantity of separated post-consumer plastics for reducing combustible household waste: The case of rigid plastics in Flanders

In Flanders, Belgium, rigid and soft plastics represent an interesting fraction of residual household waste as a potential 80 000 Gg a^-1 can be recycled instead of incinerated. Removing a large amount of rigid packaging and non-packaging plastics from the residual household waste fraction could contribute to the goal to reduce the amount of residual household waste to less than 150 kg capita^-1 a^-1 for the Flemish region, where currently only 20% of plastics are collected selectively in drop-off facilities. Given the wide range of plastic separation schemes across the region, it is the aim of this paper to identify whether the applied separation options have an impact on the quantity of separated plastics, and, moreover, which scheme is able to separate most plastics. Cross-sectional data for the period 2008-2012 were collected for all 308 Flemish municipalities to conduct a regression analysis. The results of the analysis show that the quantity of separated plastics differs significantly between the different separation schemes used. If municipalities change their separation schemes, Flanders as a whole would be able to collect more plastic waste to better comply with its own objectives and EU regulation on recycling. Improved separation-at-source recycling initiatives, by applying the appropriate separation scheme for plastics, may increase recycling growth.

Use of complementary and alternative medicine within Norwegian hospitals

Background

Over the recent decades complementary and alternative medicine (CAM) use within and outside of the public health care system in Norway has increased. The aim of this study is to describe to what extent CAM is offered in Norwegian hospitals in 2013 and investigate possible changes since 2008.

Methods

In January 2013 a one-page questionnaire was sent to the medical director of all included hospitals (n = 80). He/she was asked to report whether or not one or more specific CAM therapies were offered in the hospital. Fifty-nine (73.8 %) hospitals responded and form the basis for the analyses.

Results

CAM was offered in 64.4 % of the responding hospitals. No major differences were found between public and private, or between somatic and psychiatric, hospitals. Acupuncture was the most frequent CAM method offered, followed by art- and expression therapy and massage.

The proportion of hospitals offering CAM has increased from 50.5 % in 2008 to 64.4 % in 2013 (p = 0.089). The largest increase was found in psychiatric hospitals where 76.5 % of hospitals offered CAM in 2013 compared to 28.6 % in 2008 (p = 0.003). A small decrease was found in the proportion of hospitals offering acupuncture between 2008 (41.4 %) and 2013 (37.3 %).

Conclusions

A majority of Norwegian hospitals offer some sort of CAM. The largest increase since 2008 was found in psychiatric hospitals. Psychiatric hospitals seem to have established a practice of offering CAM to their patients similar to the practice in somatic hospitals. This could indicate a shift in the attitude with regard to CAM in psychiatric hospitals.

Cost comparison between private and public collection of residual household waste: multiple case studies in the Flemish region of Belgium

The rising pressure in terms of cost efficiency on public services pushes governments to transfer part of those services to the private sector. A trend towards more privatizing can be noticed in the collection of municipal household waste. This paper reports the findings of a research project aiming to compare the cost between the service of private and public collection of residual household waste. Multiple case studies of municipalities about the Flemish region of Belgium were conducted. Data concerning the year 2009 were gathered through in-depth interviews in 2010. In total 12 municipalities were investigated, divided into three mutual comparable pairs with a weekly and three mutual comparable pairs with a fortnightly residual waste collection. The results give a rough indication that in all cases the cost of private service is lower than public service in the collection of household waste. Albeit that there is an interest in establishing whether there are differences in the costs and service levels between public and private waste collection services, there are clear difficulties in establishing comparisons that can be made without having to rely on a large number of assumptions and corrections. However, given the cost difference, it remains the responsibility of the municipalities to decide upon the service they offer their citizens, regardless the cost efficiency: public or private.

Identifying the key factors in increasing recycling and reducing residual household waste: a case study of the Flemish region of Belgium

The competent waste authority in the Flemish region of Belgium created the 'Implementation plan household waste 2003-2007' and the 'Implementation plan sustainable management 2010-2015' to comply with EU regulation. It incorporates European and regional requirements and describes strategies, goals, actions and instruments for the collection and treatment of household waste. The central mandatory goal is to reduce and maintain the amount of residual household waste to 150 kg per capita per year between 2010-2015. In literature, a reasonable body of information has been published on the effectiveness and efficiency of a variety of policy instruments, but the information is complex, often contradictory and difficult to interpret. The objective of this paper is to identify, through the development of a binary logistic regression model, those variables of the waste collection scheme that help municipalities to reach the mandatory 150 kg goal. The model covers a number of variables for household characteristics, provision of recycling services, frequency of waste collection and charging for waste services. This paper, however, is not about waste prevention and reuse. The dataset originates from 2003. Four out of 12 variables in the model contributed significantly: income per capita, cost of residual waste collection, collection frequency and separate curbside collection of organic waste.

Recent adverse trends in semen quality and testis cancer incidence among Finnish men

Impaired semen quality and testicular cancer may be linked through a testicular dysgenesis syndrome of foetal origin. The incidence of testis cancer has been shown to increase among Finnish men, whereas there is no recent publication describing temporal trends in semen quality. Therefore, we carried out a prospective semen quality study and a registry study of testis cancer incidence among Finnish men to explore recent trends. A total of 858 men were investigated in the semen quality study during 1998–2006. Median sperm concentrations were 67 (95% CI 57–80) million/mL, 60 (51–71) and 48 (39–60) for birth cohorts 1979–81, 1982–83 and 1987; total sperm counts 227 (189–272) million, 202 (170–240) and 165 (132–207); total number of morphologically normal spermatozoa 18 (14–23) million, 15 (12–19) and 11 (8–15). Men aged 10–59 years at the time of diagnosis with testicular cancer during 1954–2008 were included in the registry study, which confirmed the increasing incidence of testicular cancer in recent cohorts. These simultaneous and rapidly occurring adverse trends suggest that the underlying causes are environmental and, as such, preventable. Our findings necessitate not only further surveillance of male reproductive health but also research to detect and remove the underlying factors.

The Danish version of the questionnaire on pain communication: preliminary validation in cancer patients

BACKGROUND

The modified version of the patients' Perceived Involvement in Care Scale (M-PICS) is a tool designed to assess cancer patients' perceptions of patient-health care provider pain communication process. The objective of this study was to examine the psychometric properties of the shortened Danish version of the M-PICS (SDM-PICS).

METHODS

The validated English version of the M-PICS was translated into Danish following the repeated back-translation procedure. Cancer patients were recruited for the study from specialized pain management facilities.

RESULTS

Thirty-three patients responded to the SDM-PICS, Danish Barriers Questionnaire II, Hospital Anxiety and Depression Scale, and Brief Pain Inventory Pain Severity Scale. A factor analysis of the SDM-PICS resulted in two factors: Factor one, patient information, consisted of four items assessing the extent to which the patient shared information with his/her health care provider, and Factor two, health care provider information, consisted of four items measuring the degree to which a health care provider was perceived as the one who shares information. Two separate items addressed the perceived level of information exchange between the patient and the health care provider. The SDM-PICS total had an internal consistency of 0.88. The SDM-PICS scores were positively related to pain relief and inversely related to the measures of cognitive pain management barriers, anxiety, and reported pain levels.

CONCLUSION

The SDM-PICS seems to be a reliable and valid measure of perceived patient-health care provider communication in the context of cancer pain.

Do family practitioners in Lithuania inform their patients about adverse effects of common medications?

OBJECTIVES

(1) To investigate the extent to which family physicians (GPs) in Lithuania inform their patients about possible side-effects when a common treatment is proposed. (2) To examine the relation between physicians' estimation of the severity and frequency of these side-effects and their willingness to inform patients. (3) To identify the reasons for informing or not informing the patients.

METHODS

A questionnaire, presenting three hypothetical cases involving decisions about ordinary medical treatments and a series of general questions about information about side-effects, was distributed to 500 Lithuanian GPs. The response rate was 42%.

RESULTS

The respondents differed considerably with regard to their willingness to inform patients about side-effects, but they informed their patients significantly more if the side effect was considered to be common and serious, than in cases when it was considered to be rare and trivial. The majority of the respondents informed their patients primarily to enable them to react appropriately to the side-effects in question. The major reason for not informing was that the side-effects were considered too rare to be relevant to the patient's decision-making.

CONCLUSION

Information, given to patients about side-effects by Lithuanian GPs, is not in accordance with the principle of respect for patients' autonomy and requirements of Lithuanian legislation.

Subnormal energy expenditure: a putative causal factor in the weight gain induced by treatment of hyperthyroidism

AIMS

To examine the causes of weight gain occurring as an adverse effect of treatment of hyperthyroidism.

METHODS

We measured 24-h energy expenditure (EE), body composition and spontaneous physical activity (SPA) in eight patients before and 1 year after treatment of hyperthyroidism was initiated, and eight controls.

RESULTS

One year after initiation of treatment thyrotropin was normalized, thyroid hormones had fallen to the lower end of the reference range and fat mass had increased by 3.5 kg (p < 0.001). Twenty-four hour EE adjusted for fat-free mass (FFM) was 15% higher in hyperthyroid patients before treatment than in controls (p = 0.003), and treatment decreased 24-h EE by 1.9 MJ/day (p = 0.001). After treatment, 24-h EE, adjusted for FFM, was similar to the controls. Multiple regression analyses showed that the suppressed EE could partly be attributed to an iatrogenic suppression of thyroid hormones, resulting in lower sleeping EE. Twenty-four hour SPA was normal in the hyperthyroid state, but decreased after treatment by 21% (p = 0.045), to a level not significantly different, but still below that of the controls.

CONCLUSIONS

The study suggests that weight gain during treatment of hyperthyroidism might be due to subnormal levels of EE and SPA caused by a suppression of the thyroid hormone to a level in the lower end of the normal range.

Effects of soy supplementation on blood lipids and arterial function in hypercholesterolaemic subjects

BACKGROUND

Studies on soy supplementation suggest a cardioprotective potential.

OBJECTIVE

To examine the effects on LDL cholesterol and arterial function as a result of dietary enrichment with soy supplementation.

DESIGN

A Randomized, double blind, parallel intervention trial.

SETTING

Department of Endocrinology and Metabolism C, Aarhus University Hospital, and Department of Human Nutrition, The Royal Veterinary and Agricultural University, Denmark.

SUBJECTS

In all, 100 hypercholesterolaemic but otherwise healthy subjects were included in the study of which 89 completed it.

INTERVENTIONS

Subjects were randomly assigned to 24 weeks of daily intake of either a soy supplement, Abalon (30 g soy protein, 9 g cotyledon fibre and 100 mg isoflavones) or placebo (30 g of casein). The soy supplement and placebo were provided in two sachets daily that were stirred in water. Fasting plasma lipids, TNF-alpha, homocysteine, insulin sensitivity, homeostasis model assessment (HOMA-IR), serum insulin, serum glucose, blood pressure as well as Glucagon-like peptide 1 (GLP-1), glucose-dependent insulinotropic peptide (GIP) and plasma lipids to a fat-rich meal were recorded before and after the intervention. In a sub study in 32 subjects, arterial dilatory capacity, compliance, and distensibility were recorded before and after the intervention.

RESULTS

In the main study, no difference in fasting plasma lipid levels or insulin sensitivity was found between soy-based supplement and placebo. A significant postprandial increase in GIP to the meal test was observed in the soy group (P < 0.05). In a substudy, no difference between the groups in changes in flow-mediated vasodilatation (P = 0.84) was detected, while the soy supplementation caused a reduction in LDL and total cholesterol.

CONCLUSIONS

No significant effects on blood lipids were observed in the main study to a soy supplementation in hypercholesterolaemic subjects after 24 weeks. In the substudy, the soy supplementation, however, reduced LDL and total cholesterol but did not influence markers of arterial function.

Effect of short-term high dietary calcium intake on 24-h energy expenditure, fat oxidation, and fecal fat excretion

BACKGROUND

Observational studies have shown an inverse association between dietary calcium intake and body weight, and a causal relation is likely. However, the underlying mechanisms are not understood.

OBJECTIVE

We examined whether high and low calcium intakes from mainly low-fat dairy products, in diets high or normal in protein content, have effects on 24-h energy expenditure (EE) and substrate oxidation, fecal energy and fat excretion, and concentrations of substrates and hormones involved in energy metabolism and appetite.

DESIGN

In all, 10 subjects participated in a randomized crossover study of three isocaloric 1-week diets with: low calcium and normal protein (LC/NP: 500 mg calcium, 15% of energy (E%) from protein), high calcium and normal protein (HC/NP: 1800 mg calcium, 15E% protein), and high calcium and high protein (HC/HP: 1800 mg calcium, 23E% protein).

RESULTS

The calcium intake had no effect on 24-h EE or fat oxidation, but fecal fat excretion increased approximately 2.5-fold during the HC/NP diet compared with the LC/NP and the HC/HP diets (14.2 vs 6.0 and 5.9 g/day; P < 0.05). The HC/NP diet also increased fecal energy excretion as compared with the LC/NP and the HC/HP diets (1045 vs 684 and 668 kJ/day; P < 0.05). There were no effects on blood cholesterol, free fatty acids, triacylglycerol, insulin, leptin, or thyroid hormones.

CONCLUSIONS

A short-term increase in dietary calcium intake, together with a normal protein intake, increased fecal fat and energy excretion by approximately 350 kJ/day. This observation may contribute to explain why a high-calcium diet produces weight loss, and it suggests that an interaction with dietary protein level may be important.

Long term mortality trends behind low life expectancy of Danish women

STUDY OBJECTIVE

To examine the long time mortality trends of women in Denmark.

DESIGN

Age-period-cohort analysis.

SETTING

To search for possible causes we analysed mortality rates for all Danish women and men aged 40-84 during 1960-1999. Age-period-cohort modelling was used, handling the well known indeterminacy in a sensitivity analysis.

MAIN RESULTS

The results indicate that the high risk of dying among Danish women is associated with being born between the two world wars. A similar pattern was not seen for men.

CONCLUSION

The rather simple descriptive exploration in the framework of age-period-cohort modelling used, revealed a pattern not reflected by the commonly used life expectancy calculation. It is suggested that future studies on the low life expectancy of Danish women focus on the "between wars" generations identified with a high risk of dying in this study.

Solution conformation of alpha-conotoxin EI, a neuromuscular toxin specific for the alpha 1/delta subunit interface of torpedo nicotinic acetylcholine receptor

A high resolution structure of alpha-conotoxin EI has been determined by (1)H NMR spectroscopy and molecular modeling. alpha-Conotoxin EI has the same disulfide framework as alpha 4/7 conotoxins targeting neuronal nicotinic acetylcholine receptors but antagonizes the neuromuscular receptor as do the alpha 3/5 and alpha A conotoxins. The unique binding preference of alpha-conotoxin EI to the alpha(1)/delta subunit interface of Torpedo neuromuscular receptor makes it a valuable structural template for superposition of various alpha-conotoxins possessing distinct receptor subtype specificities. Structural comparison of alpha-conotoxin EI with the gamma-subunit favoring alpha-conotoxin GI suggests that the Torpedo delta-subunit preference of the former originates from its second loop. Superposition of three-dimensional structures of seven alpha-conotoxins reveals that the estimated size of the toxin-binding pocket in nicotinic acetylcholine receptor is approximately 20 A (height) x 20 A (width) x 15 A (thickness).

Offspring sex ratio of subfertile men and men with abnormal sperm characteristics

Previous work has suggested an association between male subfertility and a female-biased offspring sex ratio. This study of the reproduction of men who had a semen analysis at the Sperm Analysis Laboratory in Copenhagen in the period 1963-1993 showed that the subfertile men had an offspring sex ratio as expected (51.0% boys versus 51.3%, P: = 0.56), and within the cohort, the offspring sex ratio had no material association with particular semen characteristics. Our results thus suggest that no important association exists between general male subfertility and a female-biased offspring sex ratio.

Risk of testicular cancer in men with abnormal semen characteristics: cohort study

OBJECTIVE

To explore the associations between semen characteristics and subsequent risk of testicular cancer.

DESIGN

Cohort study.

PARTICIPANTS

32 442 men who had a semen analysis done at the Sperm Analysis Laboratory in Copenhagen during 1963-95.

MAIN OUTCOME MEASURE

Standardised incidence ratios of testicular cancer compared with total population of Danish men.

RESULTS

Men in couples with fertility problems were more likely to develop testicular cancer than other men (89 cases, standardised incidence ratio 1.6; 95% confidence interval 1.3 to 1.9). The risk was relatively constant with increasing time between semen analysis and cancer diagnosis. Analysis according to specific semen characteristics showed that low semen concentration (standardised incidence ratio 2.3), poor motility of the spermatozoa (2.5), and high proportion of morphologically abnormal spermatozoa (3.0) were all associated with an increased risk of testicular cancer. The only other cancer group that showed increased incidence was "peritoneum and other digestive organs" (six cases; 3.7, 1.3 to 8.0). Of these, two cases were probably and two cases were possibly extragonadal germ cell tumours.

CONCLUSIONS

The results point towards the existence of common aetiological factors for low semen quality and testicular cancer. Low semen quality may also be associated with increased incidence of extragonadal germ cell tumours.

Fertility and offspring sex ratio of men who develop testicular cancer: a record linkage study

Analysis of associations between testicular cancer, subfertility and offspring sex ratio (proportion of males born among newborns) was performed on 3530 Danish men, born 1945-1980, who developed testicular cancer in the period 1960-1993. As the basis of comparison we used the total population of Danish men born in the period 1945-1980 (n = 1 488 957) and their biological children (n = 1 250 989). Men who developed testicular cancer had, prior to the cancer diagnosis, a reduced fertility (standardized fertility rate ratio: 0.93, 95% confidence interval: 0.89-0.97) and a significantly lower proportion of boys (48.9%, P: = 0.02) compared with the general population (51.3%). The reduction in fertility was more pronounced in men with non-seminoma but the reduction in offspring sex ratio was independent of histological type. This confirms earlier results from less conclusive studies and indicates that testicular cancer, male subfertility and a female-biased sex ratio among new-born infants are characteristics of male reproduction that are linked by biological mechanisms.

Natural variation in the human sex ratio

Analysis of the effect of multiple birth, birth order, age of parents and the sexes of preceding siblings on the secondary sex ratio was performed for 815 891 children, born in Denmark, 1980-1993. The proportion of males was analysed as a function of multiple birth, birth order, age of parents and the sexes of preceding siblings, using contingency tables, chi(2) tests and logistic regression analysis. The secondary sex ratio decreased with increased number of children per plural birth and with paternal age, whereas no independent effect was observed for maternal age, birth order, the sex of the preceding child, or the combination of sexes of previously born children in the family.

Fertility rates in Denmark in relation to the sexes of preceding children in the family

Analysis of the effect of sex combination of previously born children in the family on fertility rates was performed for 363,373 Danish families comprising a total of 613,900 children, to address the questions of sex preference and combination preference. The fertility rates were stratified by parental age, period and latency time to the next child, and fertility rate ratios were estimated using multiplicative Poisson regression models. Our results demonstrate a strong preference for a balanced composition of sexes in Danish families. In families with two or three children the highest fertility rates were seen in families who had same-sexed children. The lowest fertility rates were in families with two children of identical sex followed by a child of the opposite sex. A moderate sex preference for girls was indicated by higher fertility rates in two-boy families than in two-girl families.

Coexpression of G-CSF with an unglycosylated G-CSF receptor mutant results in secretion of a stable complex

Previously, we have shown that the entire extracellular domain of the granulocyte-colony stimulating factor receptor (sG-CSFr) produced in Chinese hamster ovary (CHO) cells forms a stable complex with its ligand G-CSF, at a stoichiometry of 2:2. A truncated receptor molecule consisting of the cytokine receptor homology domain and N-terminus Ig-like domain (Ig CRH) behaves quite similarly. Both of these forms of the receptor are highly glycosylated. To address the importance of glycosylation toward receptor activity and stability, and possibly obtain nonglycosylated receptor for crystallization, mutations were made to replace four Asn residues which are N-glycosylated in the truncated receptor. Virtually no receptor was recovered from conditioned media of CHO cells transfected with this mutant construct, although a high-level of mRNA coding for receptor was detected; this mRNA was translated as determined by Western blots of cell lysates. These results indicate that the translated product is apparently not secreted from these cells. Cells transfected with mutant receptor cDNA were cotransfected with a cDNA construct expressing G-CSF in which the single O-glycosylation site was eliminated by mutation. Upon fermentation of the cotransfectants, we observed a large amount of receptor-ligand complex in the conditioned media. The purified unglycosylated complex appeared to be of the same binding stoichiometry and approximate binding affinity as that of complex formed by addition of purified ligand and unmutated receptor. These results show that while glycosylation of sG-CSFr is not necessary for ligand binding, it appears to be crucial in folding and export from the cell.

Inactivation of a serotonin-gated ion channel by a polypeptide toxin from marine snails

The venom of predatory marine snails is a rich source of natural products that act on specific receptors and ion channels within the mammalian nervous system. A 41-amino acid peptide, final sigma-conotoxin GVIIIA, was purified on the basis of its ability to inactivate the 5-HT3 receptor, an excitatory serotonin-gated ion channel. final sigma-Conotoxin contains a brominated tryptophan residue, which may be important for peptide activity because the endogenous ligand for the 5-HT3 receptor is a hydroxylated derivative of tryptophan. final sigma-Conotoxin inactivates the 5-HT3 receptor through competitive antagonism and is a highly selective inhibitor of this receptor. Serotonin receptors can now be included among the molecular targets of natural polypeptide neurotoxins.

The contryphans, a D-tryptophan-containing family of Conus peptides: interconversion between conformers

We previously characterized contryphan-R, a D-tryptophan-containing octapeptide from the venom of Conus radiatus. In this study, we present evidence that the contryphan family of peptides is widely distributed in venoms of the fish-hunting cone snails. We purified, synthesized and characterized contryphan-Sm from Conus stercusmuscarum venom, and obtained molecular evidence for the existence of a third peptide, contryphan-P from Conus purpurascens venom ducts. The sequences of these three contryphans showed identity in seven of eight amino acids and a conserved pattern of post-translational modification. We also demonstrate that contryphan-Sm equilibrates between two distinct conformational states.

kappa-Conotoxin PVIIA is a peptide inhibiting the shaker K+ channel

kappa-Conotoxin PVIIA (kappa-PVIIA), a 27-amino acid toxin from Conus purpurascens venom that inhibits the Shaker potassium channel, was chemically synthesized in a biologically active form. The disulfide connectivity of the peptide was determined. kappa-Conotoxin PVIIA has the following structure. This is the first Conus peptide known to target K+ channels. [structure: see text] Although the Shaker K+ channel is sensitive to kappa-PVIIA, the rat brain Kv1.1 subtype is resistant. Chimeras between Shaker and the Kv1.1 K+ channels were constructed and expressed in Xenopus oocytes. Only channels containing the putative pore-forming region between the fifth and sixth transmembrane domains of Shaker retained toxin sensitivity, indicating that the toxin target site is in this region of the channel. Evidence is presented that kappa-PVIIA interacts with the external tetraethyl-ammonium binding site on the Shaker channel. Although both kappa-PVIIA and charybdotoxin inhibit the Shaker channel, they must interact differently. The F425G Shaker mutation increases charybdotoxin affinity by 3 orders of magnitude but abolishes kappa-PVIIA sensitivity. The precursor sequence of kappa-PVIIA was deduced from a cDNA clone, revealing a prepropeptide comprising 72 amino acids. The N-terminal region of the kappa-PVIIA prepropeptide exhibits striking homology to the omega-, muO-, and delta-conotoxins. Thus, at least four pharmacologically distinct superfamilies of Conus peptides belong to the same "O" superfamily, with the omega- and kappa-conotoxins forming one branch, and the delta- and muO-conotoxins forming a second major branch.

Differential targeting of nicotinic acetylcholine receptors by novel alphaA-conotoxins

We describe the isolation and characterization of two peptide toxins from Conus ermineus venom targeted to nicotinic acetylcholine receptors (nAChRs). The peptide structures have been confirmed by mass spectrometry and chemical synthesis. In contrast to the 12-18 residue, 4 Cys-containing alpha-conotoxins, the new toxins have 30 residues and 6 Cys residues. The toxins, named alphaA-conotoxins EIVA and EIVB, block both Torpedo and mouse alpha1-containing muscle subtype nAChRs expressed in Xenopus oocytes at low nanomolar concentrations. In contrast to alpha-bungarotoxin, alphaA-EIVA is inactive at alpha7-containing nAChRs even at micromolar concentrations. In this regard, alphaA-EIVA is similar to the previously described alpha-conotoxins (e.g. alpha-MI and alpha-GI) which also selectively target alpha1- versus alpha7-containing nAChRs. However, alpha-MI and alpha-GI discriminate between the alpha/delta versus alpha/gamma subunit interfaces of the mouse muscle nAChR with 10,000-fold selectivity. In contrast, alphaA-conotoxin EIVA blocks both the alpha/gamma site and alpha/delta site with equally high affinity but with distinct kinetics. The alphaA-conotoxins thus represent novel probes for the alpha/gamma as well as the alpha/delta binding sites of the nAChR.

A noncompetitive peptide inhibitor of the nicotinic acetylcholine receptor from Conus purpurascens venom

A paralytic peptide, psi-conotoxin Piiie has been purified and characterized from Conus purpurascens venom. Electrophysiological studies indicate that the peptide inhibits the nicotinic acetylcholine receptor (nAChR). However, the peptide does not block the binding of alpha-bungarotoxin, a competitive nAChR antagonist. Thus, psi-conotoxin Piiie appears to inhibit the receptor at a site other than the acetylcholine-binding site. As ascertained by sequence analysis, mass spectrometry, and chemical synthesis, the peptide has the following covalent structure: HOOCCLYGKCRRYOGCSSASCCQR* (O = 4-trans hydroxyproline; * indicates an amidated C-terminus). The disulfide connectivity of the toxin is unrelated to the alpha- or the alphaA-conotoxins, the Conus peptide families that are competitive inhibitors of the nAChR, but shows homology to the mu-conotoxins (which are Na+ channel blockers).

Cutaneous granulomas as a presenting sign in ataxia-telangiectasia

Telangiectasia is the classic cutaneous finding of ataxia-telangiectasia (AT) and is often the physical finding that suggests the diagnosis. We report a patient in whom noninfectious cutaneous granulomas were the presenting cutaneous feature of AT and discuss immunodeficiency syndromes that are associated with similar cutaneous granulomas.

Genetic population structure of the prosobranch snail Potamopyrgus antipodarum (Gray) in Denmark using PCR-RAPD fingerprints

Parthenogenetic species are often more widely distributed geographically than their sexual relatives. This success in colonizing can be explained either by dispersal of one or a few clones of wide physiological tolerance or by the distribution of many locally adapted clones. Here we test the hypothesis that successfully invading clones of Potamopyrgus antipodarum (Gray) are composed of a few broadly adapted genotypes by using polymerase chain reaction random amplified polymorphic DNA (PCR-RAPD) fingerprinting on six different populations of P. antipodarum from Denmark and three morphotypes of P. antipodarum from Britain. We detected two genotypes of P. antipodarum in six populations examined across Denmark using four decamer primers. The two genotypes were found to be morphologically and genetically indistinguishable from British P. antipodarum. In five of the six Danish populations only one genotype was found; at the remaining site, the two genotypes occurred sympatrically. The present study suggests that P. antipodarum successfully invaded Europe by the proliferation of very few clones.

Knowledge of HIV infection and the fear of mixing socially with HIV-infected and AIDS-sick patients among STD patients in Bergen, Norway

This is a study of data from 599 STD (sexually transmitted disease) clinic patients in Bergen, Norway who visited the clinic in April-June 1989. We studied the patients' knowledge of modes of HIV transmission and their degree of ignorance of how HIV is not transmitted. Particular interest was focused on how misconceptions influenced the respondents' perception of HIV/AIDS sick persons and the importance of confidence in AIDS information from the health authorities. The objective of the study was to compare the data from this investigation of STD patients with data from similar studies in the general public conducted in Norway between 1986 and 1991. HIV-infected blood (98.3%; 589/599) and unprotected vaginal intercourse (91%; 545/599) were frequently suggested as a mode of HIV transmission, while 22.4% (134/599) did not recognize anal sex as an unsafe sexual practice. There was no statistically significant difference in their knowledge of modes of HIV transmission between the following patient subgroups: homosexuals/bisexuals, intravenous drug users (IVDUs)/prostitutes, sex customers and respondents classified as 'other heterosexuals'. Regarding ways in which HIV is not transmitted, ignorance was first and foremost related to whether the HIV virus could be passed on by oral kissing (wrong: 38.5%). Knowledge of how HIV is not transmitted was positively correlated with education (p < 0.05) and confidence in the HIV/AIDS information from health authorities (p < 0.05), and negatively correlated with age (p < 0.05). Respondents knowing how HIV is not transmitted considered social contact with HIV/AIDS sick persons to be harmless (p < 0.001). The present information campaigns on HIV/AIDS have been less effective than expected. In the future we must find new ways of informing the public by identifying the essential components that are missing from the information campaigns we have today.