The main actors involved in parasitization of Heliothis virescens larva

At the moment of parasitization by another insect, the host Heliothis larva is able to defend itself by the activation of humoral and cellular defenses characterized by unusual reactions of hemocytes in response to external stimuli. Here, we have combined light and electron microscopy, staining reactions, and immunocytochemical characterization to analyze the activation and deactivation of one of the most important immune responses involved in invertebrates defense, i.e., melanin production and deposition. The insect host/parasitoid system is a good model to study these events. The activated granulocytes of the host insect are a major repository of amyloid fibrils forming a lattice in the cell. Subsequently, the exocytosed amyloid lattice constitutes the template for melanin deposition in the hemocel. Furthermore, cross-talk between immune and neuroendocrine systems mediated by hormones, cytokines, and neuromodulators with the activation of stress-sensoring circuits to produce and release molecules such as adrenocorticotropin hormone, alpha melanocyte-stimulating hormone, and neutral endopeptidase occurs. Thus, parasitization promotes massive morphological and physiological modifications in the host insect hemocytes and mimics general stress conditions in which phenomena such as amyloid fibril formation, melanin polymerization, pro-inflammatory cytokine production, and activation of the adrenocorticotropin hormone system occur. These events observed in invertebrates are also reported in the literature for vertebrates, suggesting that this network of mechanisms and responses is maintained throughout evolution

Lysosomal membrane permeabilization in cell death

18 páginas, 3 figuras, 2 tablas -- PAGS nros. 6434-6451Mitochondrial outer membrane permeabilization (MOMP) constitutes one of the major checkpoint(s) of apoptotic and necrotic cell death. Recently, the permeabilization of yet another organelle, the lysosome, has been shown to initiate a cell death pathway, in specific circumstances. Lysosomal membrane permeabilization (LMP) causes the release of cathepsins and other hydrolases from the lysosomal lumen to the cytosol. LMP is induced by a plethora of distinct stimuli including reactive oxygen species, lysosomotropic compounds with detergent activity, as well as some endogenous cell death effectors such as Bax. LMP is a potentially lethal event because the ectopic presence of lysosomal proteases in the cytosol causes digestion of vital proteins and the activation of additional hydrolases including caspases. This latter process is usually mediated indirectly, through a cascade in which LMP causes the proteolytic activation of Bid (which is cleaved by the two lysosomal cathepsins B and D), which then induces MOMP, resulting in cytochrome c release and apoptosome-dependent caspase activation. However, massive LMP often results in cell death without caspase activation; this cell death may adopt a subapoptotic or necrotic appearance. The regulation of LMP is perturbed in cancer cells, suggesting that specific strategies for LMP induction might lead to novel therapeutic avenuesResearch in our labs is supported by grants from Ministry of Science (BFU-2006-00508) and from Fundación La Caixa (BM06-125-1) to PB and Ligue Nationale contre le Cancer (Equipe labellisée), European Commission (Active p53, Apo-Sys, RIGHT, TransDeath, ChemoRes, DeathTrain), Agence Nationale pour la Recherche, Institut National contre le Cancer, Cancéropôle Ile-de-France and Fondation pour la Recherche Médicale to GKPeer reviewe

Thymic maturation and programmed cell death

The thymus plays a crucial role in the development and maintenance of the immune system, being the main site of T cell differentiation and maturation throughout life. Associated to dramatic structural changes, its function seems to markedly diminish with time, never the less, there are several data indicating that, despite organ atrophy, at least part of the thymus remains active throughout one's lifetime. In the last decades, several studies, aiming to understand the significance of age-dependent changes in thymic structure and function, highlighted the concept that developmental and maturational stages strongly depend on the balanced and coordinated occurrence of life and death options. In particular, programmed cell death represents a fundamental requirement in order to assure a proper functionality of the immune response and to avoid the formation of uncontrolled and potentially self-damaging lymphocytic clones. By contrast, the time-dependent thymic atrophy is due to progressive replacing of lymphoid with adipose tissue. In the light of the increased knowledge on the factors/mechanisms controlling the process of adipogenesis, it could be suggested that fat accumulation in the thymic stroma might not be considered a passive, deleterious consequence of aging, but instead a potential source of molecules with various biological functions. Therefore, thymus represents a very interesting model in terms of energy expenditure and trade off, tissue homeostasis, immune defence and disease escape. The implications of changes in thymic structure, in the ratio of proliferation and programmed cell death as well as the occurrence of fat involution still represent an open question and will be discussed in the present chapter

Toward an online repository of Standard Operating Procedures (SOPs) for (meta)genomic annotation

The methodologies used to generate genome and metagenome annotations are diverse and vary between groups and laboratories. Descriptions of the annotation process are helpful in interpreting genome annotation data. Some groups have produced Standard Operating Procedures (SOPs) that describe the annotation process, but standards are lacking for structure and content of these descriptions. In addition, there is no central repository to store and disseminate procedures and protocols for genome annotation. We highlight the importance of SOPs for genome annotation and endorse an online repository of SOPs

Latent tuberculosis infection in patients with chronic plaque psoriasis: Evidence from the Italian Psocare Registry

Background The nationwide prevalence of latent tuberculosis infection (LTBI) in Italian patients with psoriasis has never been investigated.Objectives To estimate the nationwide prevalence of LTBI in Italian patients with psoriasis who are candidates for systemic treatment.Methods Data were obtained from the Psocare Registry on those patients (n = 4946) with age > 18 years, systemic treatment at entry specified and tuberculin skin test (TST) performed according to the Mantoux method. LTBI diagnosis was based on a positive TST result in the absence of any clinical, radiological or microbiological evidence of active tuberculosis.Results Latent tuberculosis infection was diagnosed in 8.3% of patients with psoriasis (409 of 4946). The prevalence of LTBI was lower in patients on biologics than in those on conventional systemic treatments, ranging from 4.3% (19 of 444) of patients on adalimumab to 31% (eight of 26) of those on psoralenultraviolet A (P < 0.05). Independent factors associated with LTBI were male sex [odds ratio (OR) 1.30, 95% confidence interval (CI) 1.04-1.62; P = 0.02], age over 55 years (OR 2.93, 95% CI 2.18-3.93; P < 0.001) and being entered into a conventional treatment (OR 3.83, 95% CI 3.10-4.74; P < 0.001). Positive history of tuberculosis was seen in 1% of patients (n = 49).Conclusions The nationwide prevalence of LTBI in Italian patients with psoriasis candidate to systemic treatment is high, and screening is recommended prior to biological treatment

Metabolic abnormalities associated with initiation of systemic treatment for psoriasis: evidence from the Italian Psocare Registry.

NCBINCBI Logo Skip to main content Skip to navigation Resources How To About NCBI Accesskeys Sign in to NCBI PubMed US National Library of Medicine National Institutes of Health Search database Search term Clear input Advanced Help Result Filters Display Settings: Abstract Send to: J Eur Acad Dermatol Venereol. 2013 Jan;27(1):e30-41. doi: 10.1111/j.1468-3083.2012.04450.x. Epub 2012 Feb 7. Metabolic abnormalities associated with initiation of systemic treatment for psoriasis: evidence from the Italian Psocare Registry. Gisondi P1, Cazzaniga S, Chimenti S, Giannetti A, Maccarone M, Picardo M, Girolomoni G, Naldi L; Psocare Study Group. Collaborators (368) Author information Abstract OBJECTIVE: To evaluate variations in laboratory parameters and diagnoses of selected clinical conditions up to 16 weeks after starting a new systemic psoriasis treatment for Psocare Registry enrollees. DESIGN: Prospective cohort study. SETTING: Italian public referral centres for psoriasis treatment. PATIENTS: First-time recipients (n = 10,539) of continuous systemic psoriasis treatment for at least 16 weeks. MAIN OUTCOME MEASURE: Mean variations in (weeks 8 and 16) and proportions of patients reaching a clinically meaningful increase in serum levels (week 16) of total and low-density lipoprotein cholesterol, triglycerides, aspartate amino transferase, alanine amino transferase and creatinine, as well as week-16 cumulative incidences of new diagnoses of diabetes mellitus and arterial hypertension. RESULTS: Mean cholesterol and triglyceride levels significantly increased in patients treated with acitretin or cyclosporine. Mean triglyceride levels also increased in efalizumab- and etanercept-treated patients. Mean transaminase values increased in methotrexate-treated patients, and mean aspartate amino transferase levels increased in infliximab-treated patients. The average serum creatinine value increased in cyclosporine-treated patients. Acitretin and cyclosporine were associated with risk of hypercholesterolaemia (odds ratios 1.51 and 1.34) and acitretin with risk of hypertriglyceridaemia (odds ratio 1.43). Methotrexate and infliximab were associated with risk of more than doubling the upper normal aspartate amino transferase (odds ratios 2.06 and 1.87) and alanine amino transferase (odds ratios 2.38 and 1.74) values. The relative risk of developing arterial hypertension and diabetes was increased for patients receiving cyclosporine (odds ratios 3.31 and 2.88). CONCLUSION: Systemic treatments for psoriasis resulted in heterogeneous effects on the parameters analysed

Efficacy of switching between tumor necrosis factor-alfa inhibitors in psoriasis: results from the Italian Psocare registry

Some studies have shown that switching patients from one tumor necrosis factor (TNF)-alfa inhibitor to another may be beneficial when they have an inadequate response or an adverse event