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Activity of Thymus capitellatus volatile extract, 1,8-cineoleand borneol agains...

In the search for new leishmanicidal agents, Thymus capitellatus Hoffmanns. & Link (familyLamiaceae) volatile extract and its major compounds, 1,8-cineole and borneol, were testedagainst Leishmania infantum, Leishmania tropica and Leishmania major. Plant volatile extract(essential oil) was analysed by GC and GC–MS and the activity of essential oil on Leishmaniapromastigotes viability was assessed using tetrazol...

Simulated hemodynamics in human carotid bifurcation based on Doppler ultrasound...

Background: Atherosclerotic lesions commonly develop at arterial branch sites. Noninvasive carotid artery ultrasound is a well-established and effective method which allows real-time images and measurements of flow velocities. We aimed to develop a methodology for patient-specific computational 3D reconstruction and blood flow simulation based on ultrasound image data. Material and Methods: Subject-specific stu...

Activity of Thymus capitellatus volatile extract, 1,8-cineole and borneol again...

In the search for new leishmanicidal agents, Thymus capitellatus Hoffmanns. & Link (family Lamiaceae) volatile extract and its major compounds, 1,8-cineole and borneol, were tested against Leishmania infantum, Leishmania tropica and Leishmania major. Plant volatile extract (essential oil) was analysed by GC and GC–MS and the activity of essential oil on Leishmania promastigotes viability was assessed using tetr...

Regulatory T cells in elderly patients with asthma

BACKGROUND: Airway walls in asthma present an accumulation of activated cells that determine bronchial structural changes and disease progression and severity. During the aging process, the immunoinflammatory response changes as a consequence of chronic antigenic stress. OBJECTIVE: To evaluate T-cell subsets with regulatory functions associated with asthma in elderly patients METHODS: A group of 153 individua...

Aging and asthma - changes in CD45RA, CD29 and CD95 T cells subsets

BACKGROUND: Aging is associated with thymus involution leading to a reduction in naive T cells and to an accumulation of effector-memory cells. Apoptosis is a key mechanism to clear the immune system from activated and harmful cells. In asthma the stimulation of T cells by environmental antigens can decrease naive cells and sustain activated cells. The aim of this work was to evaluate the imbalance between CD45...

Estudo do perfil do envelhecimento da população portuguesa

Regulation by glucose of oscillatory electrical activity and 5-HT/insulin relea...

The glucose sensitivity of bursting electrical activity and pulsatile insulin release from pancreatic islets was determined in absence of functional KATP channels. Membrane potential, [Ca2+]i and 5-HT/insulin release were measured by intracellular recording, fura-2 fluorescence and 5-HT amperometry, respectively. Single mouse islets, bathed in tolbutamide or glibenclamide and high extracellular Ca2+ (Ca2+o), di...

Regulation by glucose of oscillatory electrical activity and 5-HT/insulin relea...

The glucose sensitivity of bursting electrical activity and pulsatile insulin release from pancreatic islets was determined in absence of functional KATP channels. Membrane potential, [Ca2+]i and 5- HT/insulin release were measured by intracellular recording, fura-2 fluorescence and 5-HT amperometry, respectively. Single mouse islets, bathed in tolbutamide or glibenclamide and high extracellular Ca2+ (Ca2+o), d...

Selective stimulation of catecholamine release from bovine adrenal chromaffin c...

Background 2-Methylthioadenosine 5'-triphosphate (2-MeSATP), formerly regarded as a specific P2Y (metabotropic) purinergic receptor agonist, stimulates Ca2+ influx and evokes catecholamine release from adrenal chromaffin cells. These cells express P2Y and P2X (ionotropic) purinoceptors, with the latter providing an important Ca2+ influx pathway. Using single cell calcium imaging techniques, we have determined ...

Functional distribution of Ca2+-coupled P2 purinergic receptors among adrenergi...

Background Adrenal chromaffin cells mediate acute responses to stress through the release of epinephrine. Chromaffin cell function is regulated by several receptors, present both in adrenergic (AD) and noradrenergic (NA) cells. Extracellular ATP exerts excitatory and inhibitory actions on chromaffin cells via ionotropic (P2X) and metabotropic (P2Y) receptors. We have taken advantage of the actions of the purin...