Differential response of human basophil activation markers: a multi-parameter flow cytometry approach

<p>Abstract</p> <p>Background</p> <p>Basophils are circulating cells involved in hypersensitivity reactions and allergy but many aspects of their activation, including the sensitivity to external triggering factors and the molecular aspects of cell responses, are still to be focused. In this context, polychromatic flow cytometry (PFC) is a proper tool to investigate basophil function, as it allows to distinguish the expression of several membrane markers upon activation in multiple experimental conditions. </p> <p>Methods</p> <p>Cell suspensions were prepared from leukocyte buffy coat of K2-EDTA anticoagulated blood specimens; about 1500-2500 cellular events for each tested sample, gated in the lymphocyte CD45dim area and then electronically purified as HLADRnon expressing/CD123bright, were identified as basophilic cells. Basophil activation with fMLP, anti-IgE and calcium ionophore A23187 was evaluated by studying up-regulation of the indicated membrane markers with a two-laser six-color PFC protocol.</p> <p>Results</p> <p>Following stimulation, CD63, CD13, CD45 and the ectoenzyme CD203c up-regulated their membrane expression, while CD69 did not; CD63 expression occurred immediately (within 60 sec) but only in a minority of basophils, even at optimal agonist doses (in 33% and 14% of basophils, following fMLP and anti-IgE stimulation respectively). CD203c up-regulation occurred in the whole basophil population, even in CD63non expressing cells. Dose-dependence curves revealed CD203c as a more sensitive marker than CD63, in response to fMLP but not in response to anti-IgE and to calcium ionophore.</p> <p>Conclusion</p> <p>Use of polychromatic flow cytometry allowed efficient basophil electronic purification and identification of different behaviors of the major activation markers. The simultaneous use of two markers of activation and careful choice of activator are essential steps for reliable assessment of human basophil functions.</p

Premature ejaculation: prevalence and associated conditions in a sample of 12,558 men attending the andrology prevention week 2001--a study of the Italian Society of Andrology (SIA).

Premature ejaculation (PE) is the most frequent sexual complaint.To investigate prevalence of PE and its associated conditions.We analyzed information gathered from men attending a free andrologic consultation in 186 Italian medical centers, in the setting of a project focused on andrologic prevention.Risk factors for PE.Five hundred sixty-nine men suffered from lifelong PE; 1,855 had previously normal ejaculation; and 234 had PE not specified. Men with PE were younger than those without, but after adjusting for concomitant erectile dysfunction the risk of PE significantly decreased with aging. Men more educated, or who had experienced a divorce had a slightly increased risk. Also, lifestyle and occupational status affected the risk of PE. Concerning medical history, a decreased risk of PE emerged in men with treated diabetes, and no association was found with hypertension, cardiopathy, hypercholesterolemia, and peripheral or central neuropathy.The results of the analysis of a large dataset show that subjects with PE who are seeking treatment either have experienced stress-related problems or have a physical condition predisposing to this dysfunction (genital anomalies, prostate inflammation)

Design and control for rotor-fixed wing hybrid aircraft

10.1177/2041302510394742Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering2257831-847PMGE

BNM- Broadcast Notice to Mariner

Note: Unless otherwise indicated, missing and destroyed structures are presumed to be in the immediate vicinity, possibly beneath the surface. Mariners should proceed with caution. References