Navigating in chromone chemical space: discovery of novel and distinct A3 adenosine receptor ligands

One of the major hurdles in the development of effective drugs targeting GPCRs is finding ligands selective for a specific receptor subtype. Here we describe a potent and selective hormone-based hA₃ AR ligand (K_i of 167 nM) with a remarkable selectivity.

Discovery of two new classes of potent monoamine oxidase-B inhibitors by tricky chemistry

Discovery of monoamine oxidase-B inhibitors based on chromane-2,4-dione and chromone-3-carboxamide scaffolds for the management of neurodegenerative diseases.

Acute hepatitis E complicated by Guillain-Barre syndrome in Portugal, December 2012--a case report

Autochthonous hepatitis E virus (HEV) infection has been increasingly reported in Europe and the United States, mostly arising from genotype 3 and less frequently genotype 4. We report here on a patient with HEV genotype 3a infection complicated by Guillain-Barré syndrome in Portugal in December 2012. We draw attention to the diagnosis of autochthonous HEV infection and to its rare, but important, neurological complications.

Diversidad morfológica y molecular de los Unionidae (Mollusca, Bivalvia) de Portugal

Las náyades de la familia Unionidae tienen gran plasticidad fenotípica, lo que se refleja en la forma de su concha. Esta variabilidad morfológica ha sido causa de gran confusión en la taxonomía y sistemática del grupo. Se han estudiado, genética y morfológicamente, numerosas poblaciones de náyades provenientes de nueve cuencas hidrográficas portuguesas. Para ello se han analizando dos fragmentos de genes mitocondriales (ARNr 16S y Citocromo Oxidasa I) así como diferentes variables morfológicas de la concha. Se han realizado además análisis filogenéticos para conocer la sistemática de la familia e inferir una hipótesis evolutiva de su distribución en el oeste de la península Ibérica. Los datos genéticos y morfológicos sugieren la existencia de cinco especies: Anodonta anatina, Anodonta cygnea, Potomida littoralis, Unio tumidiformis y Unio delphinus. La diferenciación de estas especies, con la excepción de A. cygnea, ha ocurrido durante el aislamiento de la península Ibérica y posterior formación de las actuales cuencas hidrográficas en el Terciario. Se discute la posibilidad de que la presencia de A. cygnea se deba a una introducción reciente. Los datos morfométricos analizados pueden ser útiles para separar las especies del género Unio, pero son también dependientes de las condiciones ambientales. La elevada variabilidad morfológica dentro de cada especie está relacionada con su plasticidad fenotípica, pero tiene a su vez un importante papel en el proceso evolutivo.

Evaluation of the illegal use of clenbuterol in Portuguese cattle farms from drinking water, urine, hair and feed samples

The recent discovery of clenbuterol contamination in Portuguese food led to the specific inspection of 16 cattle farms for beta-agonists, involving the analysis of a total of 486 samples (78 feed, 106 drinking water, 168 urine and 134 hair). The samples were screened for the beta-agonists: bromobuterol, cimaterol, clenbuterol, clenpenterol, clenproperol, hydroxymethylclenbuterol, mapenterol, salbutamol and terbutaline. Only clenbuterol was found in all analyzed matrices and the most likely method of illegal administration to animals was through drinking water. Of all samples analysed, 14.15% of drinking water were found positive in the range 0.03-3.80 mg l(-1) clenbuterol. Inclusion of hair samples in the Portuguese plan for clenbuterol residue control in live animals is discussed.

Polymeric piezoelectric actuator substrate for osteoblast mechanical stimulation

Bone mass distribution and structure are dependent on mechanical stress and adaptive response at cellular and tissue levels. Mechanical stimulation of bone induces new bone formation in vivo and increases the metabolic activity and gene expression of osteoblasts in culture. A wide variety of devices have been tested for mechanical stimulation of cells and tissues in vitro. The aim of this work was to experimentally validate the possibility to use piezoelectric materials as a mean of mechanical stimulation of bone cells, by converse piezoelectric effect. To estimate the magnitude and the distribution of strain, finite numerical models were applied and the results were complemented with the optical tests (Electronic Speckle Pattern Interferometric Process). In this work, osteoblasts were grown on the surface of a piezoelectric material, both in static and dynamic conditions at low frequencies, and total protein, cell viability and nitric oxide measurement comparisons are presented.

Inflammatory bowel disease: a patient's and caregiver's perspective

The purpose of this study was to conduct a survey examining the impact of inflammatory bowel disease (IBD) on patients' and their caregivers' daily activities. Questionnaires were distributed to patients registered in the APDI (Portuguese Association for IBD) database and their respective caregivers in 2007. Of 422 patient respondents, 251 had Crohn's disease (CD) and 171 had ulcerative colitis (UC), with the majority of patients being women (58.1%) and aged over 40 years (37.4%). The number of disease flares experienced by IBD patients was slightly higher for patients with CD than for patients with UC (2.64 vs. 2.34), and surgery was more often required in CD patients as compared to UC patients (42.4 vs. 7%). Sixty percent (60%) of patients reported having no problems with mobility, daily activities, or personal hygiene; however, over half of all patients experienced some pain and anxiety. Adult patients and children and adolescents respectively experienced time off work or school due to their disease but caregivers were not affected in this regard. The caregivers life (N=324) was affected by anxiety, with the major concern reported as the risk of the patient developing cancer. Both IBD patients and caregivers thought that the provision of information on new drugs and contact time with a doctor would have the biggest impact on improving care. The symptoms and complications of IBD have a considerable impact on the lives of patients and their caregivers, and several actions could be taken to improve their care.

Low-frequency rTMS of the vertex in the prophylactic treatment of migraine

High-frequency repetitive transcranial magnetic stimulation (rTMS) increases and low-frequency rTMS decreases neural excitability. Clinically, rTMS shows beneficial effects in the treatment of neurological and psychiatric disorders. Furthermore, chronic and neuropathic pain has been shown to respond to rTMS treatment. A small pilot study revealed prophylactic effects of high-frequency rTMS in migraine. As there is evidence of neuronal hyperexcitability in migraine, we conducted a placebo-controlled, blinded study to evaluate the therapeutic effects of low-frequency rTMS in migraine. The primary end-point was defined as a reduction of migraine attacks compared with placebo, secondary outcomes were a reduction in the total number of days with headache, hours with headache, pain intensity and a decrease of analgesic intake for migraine. Twenty-seven migraineurs completed the study and were treated with rTMS on five consecutive days. For the verum group, two trains of 500 pulses with a frequency of 1 Hz were applied over vertex with a round coil. For the treatment of the placebo group, a figure-of-eight sham coil was used. A significant decrease of migraine attacks could be observed in the verum group. However, when comparing these effects with placebo, no significance was evident. The same was true concerning secondary outcome measures with regard to days with migraine and total hours with migraine. No effects were evident for pain intensity and use of analgesics. The rTMS treatment was tolerated well. rTMS stimulation over vertex with 1 Hz was not effective in migraine prophylaxis when compared with placebo. The positive effects regarding migraine attacks, days and total hours with migraine in the verum group are encouraging and indicate that further research on this topic is warranted.