Genetic ablation of ataxin-2 increases several global translation factors in their transcript abundance but decreases translation rate

Spinocerebellar ataxia type 2 (SCA2) and amyotrophic lateral sclerosis (ALS) are neurodegenerative disorders, caused or modified by an unstable CAG-repeat expansion in the SCA2 gene, which encodes a polyglutamine (polyQ) domain expansion in ataxin-2 (ATXN2). ATXN2 is an RNA-binding protein and interacts with the poly(A)-binding protein PABPC1, localizing to ribosomes at the rough endoplasmic reticulum. Under cell stress, ATXN2, PABPC1 and small ribosomal subunits are relocated to stress granules, where mRNAs are protected from translation and from degradation. It is unknown whether ATXN2 associates preferentially with specific mRNAs or how it modulates RNA processing. Here, we investigated the RNA profile of the liver and cerebellum from Atxn2 knockout (Atxn2 (-/-)) mice at two adult ages, employing oligonucleotide microarrays. Prominent increases were observed for Lsm12/Paip1 (>2-fold), translation modulators known as protein interactor/competitor of ATXN2 and for Plin3/Mttp (>1.3-fold), known as apolipoprotein modulators in agreement with the hepatosteatosis phenotype of the Atxn2 (-/-) mice. Consistent modest upregulations were also observed for many factors in the ribosome and the translation/secretion apparatus. Quantitative reverse transcriptase PCR in liver tissue validated >1.2-fold upregulations for the ribosomal biogenesis modulator Nop10, the ribosomal components Rps10, Rps18, Rpl14, Rpl18, Gnb2l1, the translation initiation factors Eif2s2, Eif3s6, Eif4b, Pabpc1 and the rER translocase factors Srp14, Ssr1, Sec61b. Quantitative immunoblots substantiated the increased abundance of NOP10, RPS3, RPS6, RPS10, RPS18, GNB2L1 in SDS protein fractions, and of PABPC1. In mouse embryonal fibroblasts, ATXN2 absence also enhanced phosphorylation of the ribosomal protein S6 during growth stimulation, while impairing the rate of overall protein synthesis rates, suggesting a block between the enhanced translation drive and the impaired execution. Thus, the physiological role of ATXN2 subtly modifies the abundance of cellular translation factors as well as global translation.

Adhesion and activation of platelets from subjects with coronary artery disease and apparently healthy individuals on biomaterials

On the basis of the clinical studies in patients with coronary artery disease (CAD) presenting an increased percentage of activated platelets, we hypothesized that hemocompatibility testing utilizing platelets from healthy individuals may result in an underestimation of the materials' thrombogenicity. Therefore, we investigated the interaction of polymer-based biomaterials with platelets from CAD patients in comparison to platelets from apparently healthy individuals. In vitro static thrombogenicity tests revealed that adherent platelet densities and total platelet covered areas were significantly increased for the low (polydimethylsiloxane, PDMS) and medium (Collagen) thrombogenic surfaces in the CAD group compared to the healthy subjects group. The area per single platelet-indicating the spreading and activation of the platelets-was markedly increased on PDMS treated with PRP from CAD subjects. This could not be observed for collagen or polytetrafluoroethylene (PTFE). For the latter material, platelet adhesion and surface coverage did not differ between the two groups. Irrespective of the substrate, the variability of these parameters was increased for CAD patients compared to healthy subjects. This indicates a higher reactivity of platelets from CAD patients compared to the healthy individuals. Our results revealed, for the first time, that utilizing platelets from apparently healthy donors bears the risk of underestimating the thrombogenicity of polymer-based biomaterials.

Control of Neonectria ditissima with copper based products in New Zealand

New Zealand pipfruit crops require postharvest fungicides for control of European canker caused by Neonectria ditissima Fungicide efficacy trials to protect leaf scars from N ditissima infections were conducted during autumn 2013 and 2014 Disease control of artificially inoculated leaf scars was achieved by single applications of copper oxychloride and copper oxide but not copper hydroxide applied at 43 11 and 06 kg elemental copper/ ha respectively Control of leaf scar infections by copper oxide (065 and 095 kg elemental copper/ha) was similar to control by captan Leaf scars (010 days old) remained susceptible to infections up to 10 days after leaf fall; disease control was achieved by redistribution of copper and captan fungicides onto new leaf scars Disease control using copper oxide was consistent and similar to control using captan The copper product and concentration of elemental copper are important for successful control of leaf scar infections by N ditissima

An old workhorse for new applications: Fe(dpm)3 as a precursor for low-temperature PECVD of iron(iii) oxide

A combined theoretical–experimental investigation on Fe(dpm)₃ as a precursor for PECVD of iron(iii) oxide is presented. Pure Fe₂O₃ nanomaterials have been obtained at temperatures as low as 100 °C, even on flexible plastic substrates.

[Negative hallucination, self-onsciousness and ageing]

BACKGROUND

Negative hallucinations are characterized by a defect in perception of an object or a person, or a denial of the existence of their perception. Negative hallucinations create blank spaces, due to both an impossible representation and an incapability of investment in reality. They have a close relationship with Cotard's syndrome, delusional theme of organ denial observed in melancholic syndromes in the elderly.

METHODS

Phenomenological approach. The phenomenology of negative hallucinations provides quite an amount of information on the origin of the psychotic symptoms when one is rather old.

RESULTS

The connections between hallucinations, mood disorders and negative symptoms are often difficult to live with for the nearest and dearest. Negative hallucinations require a strict approach to identify their expression that is crucial because a wide heterogeneity exists within the pathological pictures, as in Cotard's syndrome. Although the negative hallucination has an anti traumatic function in elderly people fighting against mental pain, it still represents a deficiency in symbolization. The prevalence of this symptom is without doubt underestimated, although its presence often underlines thymic suffering that is more striking. These hallucinatory symptoms have an important impact on the patients' daily life, and they appear to be prisoners of a suffering, which cannot be revealed.

CONCLUSIONS

We propose in this article to review the clinical symptoms of negative hallucinations in the elderly and the way to manage them. The medicinal approaches are not always effective. A greater place must be given to what is in connection with the body, aiming at a strong impact and thus to offer non-pharmacological approaches, such as somatic ones, which can be either invasive (electroconvulsive therapy) or not (transcranial magnetic stimulation).

Le syndrome métabolique : prévalence et analyse des pratiques, résultats d’une expérience menée au CHRU de Brest

Contexte

La prévalence du syndrome métabolique est nettement plus élevée chez les patients schizophrènes que dans la population générale, pouvant atteindre 41 % [1]. Par ailleurs, il est responsable d’un risque cardiovasculaire accru [2] ainsi que d’une augmentation du risque de diabète de type 2. Ainsi, la mortalité totale est deux à trois fois plus élevée chez les personnes souffrant de schizophrénie [3].

Objectif

Obtenir une prévalence du syndrome métabolique dans une population de schizophrènes suivis en ambulatoires et évaluer la qualité de l’identification de ce syndrome ainsi que de sa prise en charge.

Méthode

Des patients schizophrènes, sous antipsychotiques depuis au moins 3 mois, ont été inclus lors d’une première consultation par leur psychiatre traitant dans le cadre de leur suivi habituel. Des mesures comprenant un bilan biologique (HDLc, glycémie, triglycérides…), la passation d’un entretien diagnostique structuré (le MINI), des mesures cliniques (tension artérielle, tour de taille, etc) ont été réalisées. Les patients ont été revus lors d’une seconde consultation par leur psychiatre traitant avec les résultats du bilan biologique. Enfin, nous avons effectué une hétéro-évaluation des pratiques professionnelles.

Résultats

Vingt et un patients ont été inclus dans l’étude, 3 ont été perdus de vue. La prévalence du syndrome métabolique s’élève à 38,9 %. Par ailleurs, 22,2 % des sujets répondent à 2 critères de la définition du syndrome métabolique. Seulement 42,9 % des syndromes métaboliques étaient bien identifiés par les psychiatres. L’action la plus fréquemment mise en place était les règles hygiéno-diététiques (71,4 % chez les patients avec syndrome métabolique). Enfin, aucun patient ne bénéficiait d’un suivi tensionnel et très peu d’un suivi du bilan biologique (28,6 % chez les sujets avec syndrome métabolique et 54,5 % chez les sujets sans syndrome métabolique).

Bladder volume estimation from electrical impedance tomography

Non-invasive estimation of bladder volume is required to progress from scheduled voiding to a demand-driven emptying scheme for patients with impaired bladder volume sensation. Electrical impedance tomography (EIT) is a promising candidate for the non-invasive monitoring of bladder volume. This article focuses on four estimation algorithms used to map recorded EIT data to a volume estimate. Two different approaches are presented: the tomographic algorithms (one based on global impedance, the other on equivalent circular diameter) rely on the reconstruction of a tomographic image and then extract a volume estimate, whereas the parametric algorithms (one based on neural networks, the other on the singular value difference method) directly map the raw data to a volume estimate. The four algorithms presented here are evaluated for volume estimation error, noise tolerance and suppression of varying urine conductivity based on finite element simulation data.

Local cortical thinning links to resting-state disconnectivity in major depressive disorder

BACKGROUND

Local structural and metabolic as well as inter-regional connectivity abnormalities have been implicated in the neuropathology of major depressive disorder (MDD). How local tissue properties affect intrinsic functional connectivity is, however, unclear. Using a cross-sectional, multi-modal imaging approach, we investigated the relationship between local cortical tissue abnormalities and intrinsic resting-state functional connectivity (RSFC) in MDD.

METHOD

A total of 20 MDD in-patients and 20 healthy controls underwent magnetic resonance imaging at 3 T for structural and functional imaging. Whole-brain cortical thickness was calculated and compared between groups. Regions with reduced cortical thickness defined seeds for subsequent whole-brain RSFC analyses. Contributions of structural tissue abnormalities on inter-regional RSFC were explicitly investigated.

RESULTS

Lower cortical thickness was observed in MDD in the right dorsomedial prefrontal cortex (PFC), superior temporal gyrus/temporal pole, middle-posterior cingulate cortex, and dorsolateral PFC. No differences in local fractional amplitude of low-frequency fluctuations were observed. Lower thickness in patients' dorsomedial PFC further directly and selectively affected its RSFC with the precuneus, which was unaffected by symptom severity. No effects of cortical thickness in other regions showing abnormal thickness were observed to influence functional connectivity.

CONCLUSIONS

Abnormal cortical thickness in the dorsomedial PFC in MDD patients was observed to selectively and directly affect its intrinsic connectivity with the precuneus in MDD patients independent of depression severity, thereby marking a potential vulnerability for maladaptive mood regulation. Future studies should include an unmedicated sample and replicate findings using independent component analysis to test for morphometric effects on network integrity.

[Long-term treatment of schizophrenia spectrum disorders: focus on pharmacotherapy]

Schizophrenia spectrum disorders (SSD) constitute a group of psychiatric illnesses which frequently lead to persisting mental impairment. Although some patients show a clinical course with few episodes and good long-term outcome, the course of the disease is often chronic and unfavorable. Long-term treatment (LTT) of SSD pertains to the postacute stabilization period and the remission period following pharmacological and psychosocial therapy of an acute illness episode. This article provides an overview of treatment recommendations concerning long-term pharmacotherapy, dealing with side effects, treatment of non-response and therapy resistance and the treatment of psychiatric comorbidities. Furthermore, an overview of non-pharmacological treatment options is presented. An integrated therapeutic setting combining evidence-based pharmacotherapy, psychosocial interventions, and supportive therapies is recommended for optimal LTT of SSD. Considering the limited financial resources available in the healthcare system, one of the major challenges is to provide patients with access to the evidence-based treatment options available.

Cytocompatibility evaluation of different biodegradable magnesium alloys with human mesenchymal stem cells

In the last few years, the use of biodegradable magnesium (Mg) alloys has evoked great interest in the orthopedic field due to great advantages over long-term implant materials associated with various side effects like allergy and sensitization and consequent implant removal surgeries. However, degradation of these Mg alloys results in ion release, which may cause severe cytotoxicity and undesirable complications after implantation. In this study, we investigated the cytological effects of various Mg alloys on cells that play an important role in bone repair. Eight different magnesium alloys containing varying amounts of Al, Zn, Nd and Y were either incubated directly or indirectly with the osteosarcoma cell line Saos-2 or with uninduced and osteogenically-induced human mesenchymal stem cells (MSCs) isolated from bone marrow specimens obtained from the femoral shaft of patients undergoing total hip replacement. Cell viability, cell attachment and the release of ions were investigated at different time points in vitro. During direct or indirect incubation different cytotoxic effects of the Mg alloys on Saos-2 cells and osteogenically-induced or uninduced MSCs were observed. Furthermore, the concentration of degradation products released from the Mg alloys differed. Overall, Mg alloys MgNd2, MgY4, MgAl9Zn1 and MgY4Nd2 exhibit good cytocompatibility. In conclusion, this study reveals the necessity of cytocompatibility evaluation of new biodegradable magnesium alloys with cells that will get in direct contact to the implant material. Furthermore, the use of standardized experimental in vitro assays is necessary in order to reliably and effectively characterize new Mg alloys before performing in vivo experiments.

Do subjects at clinical high risk for psychosis differ from those with a genetic high risk?--A systematic review of structural and functional brain abnormalities

Introduction:

Pre-psychotic and early psychotic characteristics are investigated in the high-risk (HR) populations for psychosis. There are two different approaches based either on hereditary factors (genetic high risk, G-HR) or on the clinically manifested symptoms (clinical high risk, C-HR). Common features are an increased risk for development of psychosis and similar cognitive as well as structural and functional brain abnormalities.

Methods:

We reviewed the existing literature on longitudinal structural, and on functional imaging studies, which included G-HR and/or C-HR individuals for psychosis, healthy controls (HC) and/or first episode of psychosis (FEP) or schizophrenia patients (SCZ).

Results:

With respect to structural brain abnormalities, vulnerability to psychosis was associated with deficits in frontal, temporal, and cingulate regions in HR, with additional insular and caudate deficits in C-HR population. Furthermore, C-HR had progressive prefrontal deficits related to the transition to psychosis.

With respect to functional brain abnormalities, vulnerability to psychosis was associated with prefrontal, cingulate and middle temporal abnormalities in HR, with additional parietal, superior temporal, and insular abnormalities in C-HR population. Transition-to-psychosis related differences emphasized prefrontal, hippocampal and striatal components, more often detectable in C-HR population.

Multimodal studies directly associated psychotic symptoms displayed in altered prefrontal and hippocampal activations with striatal dopamine and thalamic glutamate functions.

Conclusion:

There is an evidence for similar structural and functional brain abnormalities within the whole HR population, with more pronounced deficits in the C-HR population. The most consistent evidence for abnormality in the prefrontal cortex reported in structural, functional and multimodal studies of HR population may underlie the complexity of higher cognitive functions that are impaired during HR mental state for psychosis.

Results on neutrinoless double-β decay of 76Ge from phase I of the GERDA experiment

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope (76)Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1 × 10(-2) counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of (76)Ge, T(1/2)(0ν) >2.1 × 10(25) yr (90% C.L.). The combination with the results from the previous experiments with (76)Ge yields T(1/2)(0ν)>3.0 × 10(25) yr (90% C.L.).

Human motion classification based on a textile integrated and wearable sensor array

A system for classification of motion patterns is presented based on a non-contact magnetic induction monitoring device. This device is textile integrated, wearable, and able to measure pulse and respiratory activity. The proposed classifiers are a neural network, support vector machine, and a decision tree algorithm generated by bootstrap aggregating. Their performance is compared using a data set comprising five different types of motion patterns. In addition, the dependence of the misclassification error on the input sample length is investigated. The features used for classification were based on information derived by discrete wavelet transform and on lower and higher order statistical measures. With the presented magnetic induction device, all tested classifiers were able to classify the defined motion pattern with an accuracy of over 93%. The proposed bootstrap aggregating decision tree algorithm produces the best classification performance (accuracy of 96%). The support vector machine classifier shows the least dependence on the sample length.

Piperazine modification in 2,4,6-triaminopyrimidine derivatives as histamine H4 receptor ligands

The human histamine H4 receptor (hH4R) is a promising new target in the therapy of inflammatory and immunomodulatory diseases. The 2,4,6-triaminopyrimidine structure has been established as a potent hH4R affinity scaffold. By using the inverse agonist ST-1012 as reference ligand, piperazine modifications were performed to get larger structural variations. Therefore, different spacers were introduced into the lead structure and the influence on affinity of this basic element was evaluated. While a short distance between aminopyrimidine and basic moiety is beneficial, a lipophilic group in the eastern part is necessary to maintain hH4R affinity.

[Advanced directives in psychiatry: A review of the qualitative literature, a state-of-the-art and viewpoints]

BACKGROUND

Advance Directives are written documents, which are used for people to notify their preference for a future situation when they are unable to give their consent. In psychiatry, psychiatric advance directives (PADs) can be used for patients with chronic psychotic disorders such as schizophrenia, or a bipolar disorder. PADs give the patient an opportunity to state wishes in advance about his/her treatment when he/she is in an acute state of illness. PADs were initially developed as a way for patients to defend themselves against the power of the psychiatrists, but are likely to become a useful tool in psychiatric care. PADs may contain information about medication, non pharmaceutical devices, and the name of a proxy decision maker. The main objective is to reduce the number of compulsory hospitalisations.

OBJECTIVE

This article is a qualitative review which carries out a state-of-the-art on the use of PADs for people with chronic psychotic disorders and defines suggestions to include this intervention in the French psychiatric context.

METHOD

We used the keywords psychiatric advance directives, crisis card, Ulysse directives, joint crisis plan (JCP) in the MEDLINE database to propose a qualitative review. We selected original clinical studies about the use of PADs for people with psychotic disorders.

RESULTS

We included 36 articles. The qualitative analysis identified seven main themes: different types of PADs, effectiveness of PADs, practical use of PADs, patient's views, clinician's views, economical aspects, and legal aspects. The content of the PADs is consistent with psychiatric standard care in nearly all cases, regarding medical instructions, pre-emergency interventions, non-hospital alternatives and non-medical personal care. Patients use their PADs to describe prodromal symptoms of relapse and to suggest a treatment and a hospitalisation in advance. PADs are not used to refuse all treatments. Patients show a strong interest in creating a directive and a high level of satisfaction when using it. They feel they have more control over their mental health problem and are more respected and valued as a person. Thirty-six to fifty-three percent of clinicians had positive opinions regarding PADs. They valued the increase of the patient's autonomy and the prevention of relapse, but were concerned about difficulties for accessing the documents, and about the lack of training of the medical teams. Clinicians also feared the pressure of relatives or partners on treatment decisions. The qualitative analysis revealed the specific benefit of the JCP, a particular type of PADs negotiated with the medical team, on the reduction of the general number of admissions. We can identify practical problems such as the lack of accessibility to PADs in emergency situations, and the clinician's reluctance to use PADs. The only economical evaluation showed a non-significant decrease in total costs.

DISCUSSION

PADs are used in a few countries, although their benefits in terms of patient's perceptions and compulsory admissions are promising. The JCP proposes a specific clinical approach based on therapeutic alliance. Its creation also involves the clinician, family members and a neutral mediator in a negotiated process. The JCP is likely to be the most efficient PAD model in reducing compulsory admissions. The use of the JCP appears to be relevant in the context of the new French legislation, establishing outpatient commitment orders and could be an effective way to improve the relationships with patients.