Worldwide cohort studies to support healthy ageing research: data availabilities and gaps

BACKGROUND

Population ageing is a transforming demographic force. To support evidence-based efforts for promoting healthy ageing, a summary of data availabilities and gaps to study ageing is needed.

METHOD

Through a multifaceted search strategy, we identified relevant cohort studies worldwide to studying ageing and provided a summary of available pertinent measurements. Following the World Health Organization's definition of healthy ageing, we extracted information on intrinsic capacity domains and sociodemographic, social, and environmental factors.

RESULTS

We identified 287 cohort studies. South America, the Middle East, and Africa had a limited number of cohort studies to study ageing compared to Europe, Oceania, Asia, and North America. Data availabilities of different measures varied substantially by location and study aim. Using the information collected, we developed a web-based Healthy Ageing Toolkit to facilitate healthy ageing research.

CONCLUSIONS

The comprehensive summary of data availability enables timely evidence to contribute to the United Nations Decades of Healthy Ageing goals of promoting healthy ageing for all. Highlighted gaps guide strategies for increased data collection in regions with limited cohort studies. Comprehensive data, encompassing intrinsic capacity and various sociodemographic, social, and environmental factors, is crucial for advancing our understanding of healthy ageing and its underlying pathways.

Lux study: Contribution of a three-dimensional, high dynamic range, ultra-high-definition heads-up visualization system to a significant delivered light intensity decrease during different types of ocular surgeries

OBJECTIVE

To explore the hypothesis that using a large, three-dimensional (3D), ultra-high-definition (4K), heads-up display (HUD) system in a real-life setting may be associated with a significant reduction in light intensity (LI) delivered during various types of eye surgery.

METHODS

Single center, post-learning curve observational study of 142 independent consecutive cases: 73 cataracts and 69 vitrectomies (VR). For each group, the only variable setting was the LI. The LI delivered by each source was calibrated in lumens (lm).

RESULTS

In the VR group, the delivered LI dramatically decreased from the 80% reference to 27.8%±13.2% (P<0.0001) (4.3 to 1.5lm). Among these surgeries, 91.3% needed 40% or less LI (2.3lm). The corneal transparency and quality of pupil dilation showed some correlation with the results. In the cataract group, the difference was even more spectacular, from 80% to 15%±11.3% (P<0.0001) (2.5 to 0.3lm). Among these surgeries, 80.8% required less than 20% LI (0.5lm). The surgical time, LI variations and type of cataract seemed to influence the results, down to 9.6%±5.4% (P<0.0001) (0.22lm) for nuclear cataracts, which represented 63% of the cataract sample.

CONCLUSION

The digital signal amplification with this HUD system allows comfortable posterior as well as anterior segment surgery despite the decrease in incident light, suggesting an unprecedented reduction in the risk of phototoxicity compared to conventional systems as well as a likely improvement in patient comfort.

125 Influence of length of porcine follicle-stimulating hormone (p-FSH) treatment before ovum pickup on ovarian response and invitro embryo production in Holstein heifers

Ovarian follicle stimulation with exogenous FSH before ovum pickup (OPU) in Bos taurus females is a common practice to increase invitro embryo production (IVP). The optimal stimulatory period length for OPU-IVP, however, has not been definitively ascertained. The objective of the present study, therefore, was to determine the effect of length of the superstimulatory treatment period before OPU on ovarian response and IVP in Holstein heifers. Nonpregnant heifers (n=57) 13.8±0.2 months of age with moderate body condition score (3.0±0.1; scale 1 to 5) were assigned in a completely randomised design to one of the following experimental groups: FSH2d: 200mg of p-FSH (Folltropin-V®, Vetoquinol) distributed in four injections (60, 60, 40, and 40mg) of FSH 12h apart; FSH3d: 200mg of p-FSH distributed in six injections (40, 40, 40, 40, 20, and 20mg) of FSH 12h apart. Timing of follicular wave emergence was synchronized by dominant follicle removal 36h before the first p-FSH injection in all heifers. An intravaginal progesterone (P4) implant (1.38g of P4 CIDR®, Zoetis) was inserted at the time of the first p-FSH injection and removed at the time of OPU, which occurred in all heifers at 44h (Nivet et al. 2012 Reproduction 143, 165-171; https://doi.org/10.1530/REP-11-0391) after the last p-FSH injection. Additionally, follicle number was determined at OPU and classified as small (&lt;6mm), medium (6–10mm) or large (&gt;10mm). Oocytes from follicles of different sizes were pooled by heifer at OPU and then classified and subjected to IVP procedures. Differences between treatment groups were evaluated using generalized linear mixed models (SAS 9.4; SAS Institute Inc.) and data are presented as mean±s.e.m. (Table 1). Lengthening the FSH treatment period resulted in a greater (P=0.01) number of large follicles; however, the number of small, medium-size, and total follicles was not different between groups. Number of total recovered oocytes, viable oocytes, cleaved oocytes, as well as recovery rate, percent viable oocytes, and cleavage rate were not different (P&gt;0.2) between groups. Similarly, the number of blastocysts produced per heifer and blastocyst rate were not different (P&gt;0.9) among groups. In conclusion, lengthening the period of FSH treatment by 1 day increased the number of large follicles at OPU but did not improve overall ovarian response, oocyte recovery, or embryo production. Table 1. Ovarian response and IVP of heifers treated with p-FSH during 2 or 3 days before ovum pickup Response FSH2d (n=28) FSH3d (n=29) P-value Small follicles (n) 5.9±0.6 5.7±0.8 0.83 Medium follicles (n) 17.0±2.4 12.9±1.6 0.18 Large follicles (n) 2.5±0.5 4.5±0.6 0.01 Total follicles (n) 25.4±2.6 23.1±1.8 0.60 Total oocytes (n) 17.0±2.5 13.0±1.2 0.23 Recovery rate (%) 62.6±3.7 56.9±3.1 0.26 Viable oocytes (n) 14.4±2.0 11.3±1.1 0.30 Viable oocytes (%) 85.0±2.4 88.0±3.0 0.31 Cleaved oocytes (n) 8.7±1.6 7.1±1.2 0.62 Cleavage rate (%) 54.7±5.7 54.1±5.7 0.96 Blastocysts (n) 3.2±0.6 3.2±0.7 0.98 Blastocyst rate (%) 20.6±4.0 22.4±3.7 0.97

Do we need cardiopulmonary exercise to determine the optimal time for intervention in valvular heart disease?

Introduction

Cardiopulmonary exercise testing (CPET) is underused in many clinical conditions other than HF. In valvular heart disease (VHD), CEPT can aid in choosing the right timing for surgery. The goals of this study were to compare the assessment of functional capacity (FC) by CEPT and NYHA scale, and to analyze the relationship between ventilatory efficiency (VE) parameters and time to surgery.

Methods

197 CPET were performed in 163 patients with moderate or severe VHD (51% female). Real METS (RM) were calculated as indexed peak VO2/3.5 (1 MET = 3.5 ml O2/kg/min) and compared to estimated METS (EM) derived by the exercise duration. An agreement analysis between RM, EM and NYHA was performed. The association among VE/VCO2 slope, pet CO2 at anaerobic threshold (AT), OUES and time to surgical indication was also studied using Cox logistic regression analysis.

Results

See Table. The RM and EM were 4,7±1,7and 6,2±2,9, respectively (p&lt;0.01), and the correlation was low (ICC=0,7, p&lt;0.001). The agreement between NYHA class and % of peak predicted V02 was very low (kappa index = 0.1, p&lt;0.001). VE parameters were predictive of an earlier surgical indication: petCO2 AT (p=0.02), VE/VCO2 slope (p=0.069), OUES (p=0.014).

Conclusions

In asymptomatic VHD patients, the surgical indication should not rely solely in their FC assessed by either NYHA scale or EM derived by duration of exercise. In our series, these parameters clearly overestimated the FC of the population. Also, the ventilatory inefficiency may be a surrogate marker of advanced disease and lead to a closer surveillance for an earlier intervention.

Real and estimated METS by type of VHD

Funding Acknowledgement

Type of funding source: None

The effect of oblique-angle sputtering on large area deposition: a unidirectional ultrathin Au plasmonic film growth design

Growing ultrathin nanogranular (NG) metallic films with continuously varying thickness is of great interest for studying regions of criticality and scaling behaviors in the vicinity of quantum phase transitions. In the present work, an ultrathin gold plasmonic NG film was grown on a sapphire substrate by RF magnetron sputtering with an intentional deposition gradient to create a linearly variable thickness ranging from 5 to 13 nm. The aim is to accurately study the electronic phase transition from the quantum tunneling regime to the metallic conduction one. The film structural characterization was performed by means of high-resolution transmission electron microscopy, atomic force microscopy, as well as x-ray diffraction and reflectivity techniques, which indicate the Volmer-Weber film growth mode. The optical and electrical measurements show a transition from dielectric-isolated gold NPs towards a continuous metallic network when t becomes larger than a critical value of t_M = 7.8 nm. Our results show that the onset of the percolation region occurs when a localized surface plasma resonance transforms to display a Drude component, indicative of free charge carriers. We demonstrate that, by using a continuously varying thickness, criteria for metallicity can be unambiguously identified. The onset of metallicity is clearly distinguished by the Drude damping factor and by discontinuities in the plasma frequencies as functions of thickness.

P4344An example that big data analysis is ready for the prime time

Introduction

Data about the epidemiology of valvular heart disease (VHD) is scarce. The increasing aging of the population may cause an augmented prevalence of VHD, with a great number of comorbidities that conveys a higher surgical risk. The aim of this study was to describe the prevalence of VHD in the patients attended at our institution from 2007 until 2017 and to describe the main characteristics of this population.

Methods

We used a new tool based on EHRead Technology to extract clinical relevant information from Electronic Health Records, designed for descriptive and predictive big data analysis. All medical reports generated at the outpatient clinic, ER or hospitalization ward were examined. Patients with a diagnosis of moderate or severe VHD were selected. The prevalence of VHD was also estimated in 2 quintiles, from 2008 until Feb 2013 and from March 2013 until Dec 2017.

Results

The total prevalence of VHD in our population was 1.04% (n=3431). Mitral regurgitation was the most frequent valvular lesion (0.4%, n=1318), followed by aortic stenosis (0.3%, n=967) and aortic regurgitation (0.28%, n=938). There was a clear female predominance (63%), and the median age was 76.4. In the 1st quintile the prevalence of VHD was 0.25%, and increased to 0.79% in the 2nd. This trend was consistent in all type of valvular lesions. The prevalence of comorbidities was higher than in other epidemiological studies (Table).

Prevalence of comorbidities Severe MR Severe AS Severe AR Euro Heart Valve Survey Hypertension 54,5% 69,1% 47,9% 49% Dyslipidemia 32,2% 40,6% 27,4% 35% Diabetes Mellitus 28,0% 31,5% 16,4% 15% Smoking (current) 5,6% 5,4% 13,7% 39% Coronary heart disease 12,0% 17,0% 12,3% 13% Stroke 7,0% 8,9% 5,5% 7% Chronic kidney disease 18,9% 16,9% 20,5% 15% Chronic obstructive pulmonary disease 11,2% 9,9% 11,0% 15% MR: Mitral regurgitation, AS: aortic stenosis, AR: aortic regurgitation, MS: mitral stenosis.

Sex Distribution

Conclusions

The older age and greater number of comorbidities seen in our series over the past ten years, compared to the Euroheart Valve Survey reinforce the idea that the percutaneous valvular therapies should play a major role in the treatment of patients with VHD. Although, the prevalence of VHD may be underestimated in our population, due to the methodology, it reflects an ever-growing pathology in an older and sicker population.

The electronic properties of three popular high spin complexes [TM(acac)3, TM = Cr, Mn, and Fe] revisited: an experimental and theoretical study

The occupied and unoccupied electronic structures of three high spin TM(acac)₃ (TM = Cr, Mn, and Fe) complexes (I, II, and III, respectively) were studied by revisiting their literature vapour-phase He(i) and, when available, He(ii) photoemission (PE) spectra and by means of original near-edge X-ray absorption fine structure (NEXAFS) spectroscopic data recorded at the O K-edge (^OK-edge) and TM L_2,3-edges (^TML_2,3-edges). The assignments of the vapour-phase He(i)/He(ii) PE spectra were guided by the results of spin-unrestricted non-relativistic Slater transition state calculations, while the ^OK-edge and ^TML_2,3-edge spectroscopic pieces of evidence were analysed by exploiting the results of spin-unrestricted scalar-relativistic time-dependent density functional theory (DFT) and DFT/ROCIS calculations, respectively. Although the actual symmetry (D₃, in the absence of any Jahn-Teller distortion) of the title molecules allowed an extensive mixing between TM t_2g-like and e_g-like atomic orbitals, the use of the Nalewajski-Mrozek TM-O bond multiplicity index combined with a thorough analysis of the ground state (GS) outcomes allowed the assessment of the TM-O bond weakening associated with the progressive TM 3d-based e_g-like orbital filling. The experimental information provided by ^OK-edge spectra was rather poor; nevertheless, the combined use of symmetry, orbitals and spectra allowed us (i) to rationalise minor differences characterizing spectral features along the series, (ii) to quantify the contribution provided by the ligand-to-metal-charge-transfer (LMCT) excitations to the different spectral features, and (iii) to recognize the t_2g-/e_g-like nature of the TM 3d-based orbitals involved in LMCT transitions. As far as the ^TML_2,3-edge spectra and the DFT/ROCIS results were concerned, the lowest lying I^,IIL₃ spectral features included states having either the GS spin multiplicity (S(I) = 3/2, S(II) = 2) or, at higher excitation energies (EEs), states with ΔS = ±1. In contrast to that, only states with ΔS = 0, -1 significantly contributed to the IIIL₃ spectral pattern. Along the whole series, the L₃ higher EE side was systematically characterized by states involving ^TM2p → π₄ MLCT excitations; as such, coupled-single excitations with ΔS = 0 were involved in I and II, while single MLCT ^TM2p → π₄ transitions with ΔS = -1 were involved in III.

'High-health, high-performance' horses: risk mitigation strategies for OIE-listed diseases

The 'high-health, high-performance' (HHP) horse concept has been developed by the World Organisation for Animal Health (OIE) together with the F6ddration Equestre Internationale and the International Federation of Horseracing Authorities. This concept is outlined in the OIE Terrestrial Animal Health Code (Chapter 4.16). It aims to address impediments to the international movement of competition horses through a harmonised, practically feasible, globally applicable framework based on simplified certification requirements for the temporary importation of HHP horses and for their return to their country of usual residence. Based on the principle of compartmentalisation, the high health status of these horses would be established by the application, at all times, of stringent health management practices and biosecurity measures to create and maintain a functional separation between horses within the defined compartment and all other equids. These provisions are intended to mitigate the risk of disease spread for most OIE-listed diseases. For six OIE-listed diseases (African horse sickness, equine influenza, equine infectious anaemia, equine piroplasmosis, glanders and Venezuelan equine encephalomyelitis), the OIE recommends disease-specific mitigation measures, which have been included in a model HHP Veterinary Certificate, to provide additional guarantees to mitigate the risk of disease spread. This article presents the HH P disease risk mitigation strategy. It demonstrates how continuous observance of the HHP biosecurity measures and health management practices provides a scientific rationale for limiting the list of diseases for which HHP horses should be screened with respect to their temporary importation for competition purposes.

Equine disease events resulting from international horse movements: Systematic review and lessons learned

REASONS FOR PERFORMING STUDY

An analysis of the factors leading to equine disease events was used to support the development of international recommendations for mitigating the risk of disease dissemination through sport horse movements (high health, high performance - 'HHP' horses).

OBJECTIVES

A review was undertaken to identify the factors resulting in equine disease events following international movement of horses to draw lessons in support of the development of international recommendations for the safe movements of a specific subpopulation of horses: the HHP sport horses.

STUDY DESIGN

Systematic review carried out in accordance with the PRISMA statement.

METHODS

The review covered disease events that occurred from 1995 to 2014, identified from the databases of the World Organisation for Animal Health (OIE) and international surveillance reports.

RESULTS

Overall, 54 disease events were identified, of which 7 were contained in post arrival quarantine and the others resulted in the introduction of pathogens into importing countries. For 81% of the introductions, the OIE recommendations applicable to the diseases involved had not been complied with. Subclinical infections are a challenge for international trade: 88% of the regulated movements that resulted in introductions involved infected horses that showed no clinical signs at the time of import. Biosecurity and management practices in resident equine populations were identified as important mitigating factors in preventing disease spread to the local horse population.

CONCLUSIONS

The global increase in international horse movements, if not appropriately regulated and supervised by competent veterinary authorities and respective equine industry partners, could potentially lead to increased global spread of infectious equine diseases. Appropriate mitigation measures and compliance with OIE import recommendations for specific diseases can significantly reduce this risk. The recommendations proposed under the HHP approach take into account the mitigation measures identified by this review as important factors in preventing pathogen introduction and spread.

Review of a series of cystectomies in women for bladder cancer:Complications and quality of life

OBJECTIVES

To analyze the complications and quality of life after cystectomies performed in women with bladder cancer at our hospital.

METHODS

Descriptive analysis of demographic data and early/late complications of cystectomies and urinary diversions performed in women at our hospital between 1990-2010. We also assessed quality of life using the Functional Assessment of Cancer Therapy-Bladder Cancer (ACT-BL) questionnaire and a comparison was drawn between groups of clinical variables.

RESULTS

Out of 265 cystectomies, 25 (10%) were performed in women. The predominant urinary diversion was ureterosigmoidostomy (60%), followed by cutaneous ureterostomy (16%), orthotopic ileal neo-bladder Studer pouch (12%), ileal conduit (10%) and permanent nephrostomy (4%). Mean age was 55.75 years. The most commonly occurring early complications were prolonged ileus (20%) and urinary fistula (20%). Late complications included hydronephrosis (32%) and pyelonephritis (32%). The results of quality of life questionnaires were very similar for the different types of urinary diversions, with a mean score of 104.5 out of 156 points.

CONCLUSIONS

Radical cystectomy is a high-risk procedure associated with many complications. In women, ureterosigmoidostomy may be a good choice for urinary diversion in selected patients, with a quality of life very similar to those with different urinary diversions.

Neurobehavioral development of preterm and full term children: biomedical and environmental influences

BACKGROUND

Previous studies indicate that VLBW preterm children obtain significantly lower scores than full-term children in all the NBAS clusters. However the samples studied usually presented additional medical complications.

AIMS

The present study aims to compare the results obtained by low-risk preterm and full term children in the NBAS, and relate possible differences to biological and contextual factors.

METHOD

Early neurobehavioral development of 150 preterm (PR) children is compared to that of 49 full term children (FT). The children were assessed at the age of 15 days (corrected age for preterm children) with the NBAS. Biological and environmental variables were collected through an extended interview with the mothers as well as medical data.

RESULTS

Significant differences were found between preterm and full term children in the following areas: motor, range of state, and regulation of state. Differences were also found in relation to birth weight in these same three areas, following a parallel pattern. These differences between the two groups were not, however, necessarily more favorable for the FT group; the PR group had higher results in the motor and range of state areas, and lower results in the regulation of state area. The mothers' smoking habit had a negative effect on infants' regulation and orientation.

CONCLUSIONS

No general maturation delay in this particular sample of preterm children was found.

[Cespace. Cervical interbody fusion system. Preliminary retrospective study in 104 cases (120 implants)]

Cespace is a cervical implant designed to obtain intervertebral fusion without bone grafting. The implant is built in titanium and coated with plasmapore (a sort of pure titanium powder). Bone growing through titanium microstructure is induced by the plasmapore, and fusion is progressively obtained once this boneinduction is completed. From January 2002 to December 2008 we operated upon 104 patients employing this implant at one or two cervical spine levels. The more frequent condition was radiculopathy caused by disc herniation or spondilosis (N= 85; 81.7%), followed by mielopathy (N=13; 12.5%). Six cases (5.7%) corresponded to cervical fractures or dislocations. In these latter ones Cespace was implanted as a method of spinal stabilization combined with Caspar plates, avoiding bone grafting. The total number of Cespace implants placed was 120. Clinical results were good in 85.5% of patients. Primary stability was obtained in all cases. Secondary stability (fusion) was evident after 1 to 2 years in all cases, confirming the bone-induction capability of plasmapore without bone grafting. No specific implant complications (pseudoartroses, settling, instability, etc) were registered. We conclude that radical microdiscectomy and Cespace box implant constitutes a good procedure for the treatment of cervical radiculopathy or mielopathy caused by disc herniation or spondylosis, avoiding bone grafting and providing high rates of vertebral fusion. In some cervical fractures associated to instability, Cespace can be used as a reliable substitute of intervertebral bone grafting in combination with anterior plate fixation.

Levetiracetam showed lower depression, insomnia and mood instability incidence than phenytoin after supratentorial tumour neurosurgery

Background

Phenytoin used to prevent seizures linked to brain cancer neurosurgery has shown many undesirable side effects and drug interactions with chemotherapy.

Aim

To evaluate the incidence of depression, insomnia, mood instability and early post surgery seizures, after Phenytoin (PHE) vs. Levetiracetam (LEV) monotherapy in patients with brain tumour subjected to a supratentorial brain tumour resection.

Methods

A prospective study in patients with supratentorial cancer diagnosis subjected to neurosurgery of resection was done. Patients were consecutive randomized to be treated with PHE (n = 26) 15 ml/kg IV-bolus, 125 mg/8 h IV x48 h, 100 mg/8 h O x7 days or with LEV (n = 34) 500 mg/12 h IV x48 h, 500 mg/12 h O x 7 days. Clinical, histological, TAC, EEG, seizures and undesirable side effects were analyzed.

Results and discussion

60 patients (53% male, aged 52.5 ± 20 years) with glioblastoma multiform 45%, meningioma 43%, Ewing's sarcoma 6.7%, others 5.3% (size between 3–6 cm, in the right brain site-65.2%, in the frontal lobe-56.2%) were subjected to followed for a week after tumour resection. Undesirable side effects (USE) were (%LEV/%PHE): total (7.3%/31.5%), somnolence (0%/32.8%), headache (6.1%/22.3%), dizziness (0%/25.6%), difficulty with coordination (0%/23.5%), depression (6.2%/18.7%), lack of energy/strength (12.5%/33.8%), insomnia (11.3%/37.9%), mood instability (12.5%/22,6%), leukopenia (0%/16.9%) after surgery (p < 0.05). None of the patients taking Levetiracetam vs. 4 of the patients taking Phenytoin (0% vs. 15.3%) had seizures after surgery (p < 0.05).

Conclusion

Levetiracetam showed lower depression, insomnia, mood instability and seizures incidence than Phenytoin after supratentorial tumour neurosurgery.

Risk factors for transmission of foot-and-mouth disease during an outbreak in southern England in 2007

During an outbreak of foot-and-mouth disease (FMD) in southern England in 2007, a case-control study was conducted to identify risk factors for infection and to investigate the relative impact of risk factors on transmission between the infected farms. Seven of the eight case farms in the outbreak and 22 control farms participated. Data were collected via questionnaires and subjected to comparative statistical analysis. Case farms were further classified as primary or secondary according to the likely source of infection during the study. On primary case farms, it was plausible that infection had been introduced directly from the original source. On secondary case farms, FMD infection was more likely to have originated from another infected premises. Calving occurred more frequently on case farms than on control farms during the risk period, and the two primary case farms had a larger proportion of youngstock than the other farms. Secondary case farms (n=5) had a higher composite environmental risk score and a lower biosecurity score than control farms.

The MIT D-lab electricity-free PortaTherm™ incubator for remote testing with the QuantiFERON®-TB Gold In-Tube assay

BACKGROUND

Use of the QuantiFERON®-TB Gold In-Tube assay (QFT-GIT) in remote areas is limited by the need to incubate blood samples within 12 h of collection. PortaTherm™ is a portable, electricity-free, phase-change incubator previously used for field collection of microbiological samples.

OBJECTIVE

To determine whether the PortaTherm can be used for the reliable incubation of QFT-GIT samples, thus enabling QFT-GIT use in settings distant from laboratory facilities.

METHODS

In a prospective comparative study in Peru, blood samples were collected from 50 participants and processed in three parallel QFT-GIT tests per participant; two were incubated in a conventional incubator; the third was incubated in the PortaTherm.

RESULTS

All 150 QFT-GIT tests gave definitive results, and for 46 of the 50 participants all three tests were concordant, eight of which were positive. Four participants had one discordant result: two due to discordance of a conventional incubator QFT-GIT result, and two due to discordant PortaTherm QFT-GIT results.

CONCLUSION

The QFT-GIT inter-incubator variability between the PortaTherm and conventional incubator was no greater than the intra-incubator variability for the conventional incubator, indicating that the PortaTherm is a suitable tool for incubating QFT-GIT whole blood samples in remote settings where access to a laboratory or electricity is limited.

In silico predicted conserved B-cell epitopes in the merozoite surface antigen-2 family of B. bovis are neutralization sensitive

The merozoite surface antigens MSA-2 of Babesia bovis constitute a family of polymorphic GPI-anchored glycoproteins located at the parasite cell surface, that contain neutralization-sensitive B-cell epitopes. These are therefore putative vaccine candidates for bovine babesiosis. It was previously shown that (i) the MSA-2 antigens of the biologically cloned Mo7 strain are encoded by four tandemly organized genes: msa-2a(1), a(2), b and c, and (ii) at least one allele of each of these genes is present in the Argentine R1A strain with a moderate degree of polymorphism. The present work was aimed at defining neutralization-sensitive B-cell epitopes in the MSA-2 family, that are conserved among different B. bovis geographical isolates. To this end, msa-2a, b and c alleles from different isolates from Argentina, USA and Mexico were amplified by PCR, cloned and sequenced. Bioinformatic analysis by ClustalW alignments and B-cell epitope prediction algorithms performed on these sequences allowed the identification of several regions containing putative conserved B-cell epitopes. Four peptides representing these regions: (KDYKTMVKFCN from msa-2a(1); YYKKHIS, from msa-2b; and THDALKAVKQLIKT and ELLKLLIEA from msa-2c) were chemically synthesized, conjugated to keyhole limpet hemocyanin and used to inoculate mice to obtain immune sera. Anti-peptide antibodies recognized B. bovis merozoite extracts in all cases in ELISA tests. In addition, these sera reacted with the surface of merozoites of an Argentine and a Mexican B. bovis strains in immunofluorescence assays, and sera against two of the selected peptides inhibited invasion of erythrocytes by in vitro cultured merozoites. Taken together, the results show that the peptide sequences selected by bioinformatic analysis represent expressed and geographically conserved B. bovis B-cell epitopes that might be strong candidates for development of subunit vaccines.

Impaired dendritic cell maturation and cytokine production in patients with chronic mucocutanous candidiasis with or without APECED

Patients with chronic mucocutaneous candidiasis (CMC) suffer persistent infections with the yeast Candida. CMC includes patients with autoimmune regulator (AIRE) gene mutations who have autoimmune polyendocrinopathy candidiasis ectodermal dystrophy (APECED), and patients without known mutations. CMC patients have dysregulated cytokine production, and dendritic cells (DCs), as central orchestrators, may underlie pathogenic disease mechanisms. In 29 patients with CMC (13 with APECED) and controls, we generated monocyte-derived DCs, stimulated them with Candida albicans, Toll-like receptor-2/6 ligand and lipopolysaccharide to assess cytokine production [interleukin (IL)-12p70, IL-23, interferon (IFN)-gamma, IL-2, tumour necrosis factor (TNF)-alpha, IL-6, transforming growth factor-beta, IL-10, IL-5, IL-13] and cell-surface maturation marker expression (CD83, CD86, human leucocyte antigen D-related). In both APECED and non-APECED CMC patients, we demonstrate impairment of DC function as evidenced by altered cytokine expression profiles and DC maturation/activation: (1) both groups over-produce IL-2, IFN-gamma, TNF-alpha and IL-13 and demonstrate impaired DC maturation. (2) Only non-APECED patients showed markedly decreased Candida-stimulated production of IL-23 and markedly increased production of IL-6, suggesting impairment of the IL-6/IL-23/T helper type 17 axis. (3) In contrast, only APECED patients showed DC hyperactivation, which may underlie altered T cell responsiveness, autoimmunity and impaired response to Candida. We demonstrate different pathogenic mechanisms on the same immune response pathway underlying increased susceptibility to Candida infection in these patients.

Pattern recognition receptor expression is not impaired in patients with chronic mucocutanous candidiasis with or without autoimmune polyendocrinopathy candidiasis ectodermal dystrophy

Patients with chronic mucocutaneous candidiasis (CMC) have an unknown primary immune defect and are unable to clear infections with the yeast Candida. CMC includes patients with AIRE gene mutations who have autoimmune polyendocrinopathy candidiasis ectodermal dystrophy (APECED), and patients without known mutations. CMC patients have dysregulated cytokine production, suggesting that defective expression of pattern recognition receptors (PRRs) may underlie disease pathogenesis. In 29 patients with CMC (13 with APECED) and controls, we assessed dendritic cell (DC) subsets and monocyte Toll-like receptor (TLR) expression in blood. We generated and stimulated monocyte-derived (mo)DCs with Candida albicans, TLR-2/6 ligand and lipopolysaccharide and assessed PRR mRNA expression by polymerase chain reaction [TLR-1-10, Dectin-1 and -2, spleen tyrosine kinase (Syk) and caspase recruitment domain (CARD) 9] in immature and mature moDCs. We demonstrate for the first time that CMC patients, with or without APECED, have normal blood levels of plasmocytoid and myeloid DCs and monocyte TLR-2/TLR-6 expression. We showed that in immature moDCs, expression levels of all PRRs involved in anti-Candida responses (TLR-1, -2, -4, -6, Dectin-1, Syk, CARD9) were comparable to controls, implying that defects in PRR expression are not responsible for the increased susceptibility to Candida infections seen in CMC patients. However, as opposed to healthy controls, both groups of CMC patients failed to down-regulate PRR mRNA expression in response to Candida, consistent with defective DC maturation, as we reported recently. Thus, impaired DC maturation and consequent altered regulation of PRR signalling pathways rather than defects in PRR expression may be responsible for inadequate Candida handling in CMC patients.

The morphology and clinical importance of the axillary arch

The axillary arch is the main variation of the axillary muscle. It was first described by Ramsay in 1795. In its classical form, it arises from the latissimus dorsi muscle and extends from this towards the pectoralis major, crossing the base of the axilla and creating a close relationship with the elements of the axillary neurovascular bundle. We describe the finding of 9 axillary arches, including one case of a bilateral arrangement. We develop a searching and finding technique for the axillary arch, essential for the safe and successful development of surgical procedures in the axillary region. Knowledge of this muscle variation and the possibility of finding it during axillary procedures is crucial for lymph node staging and lymphadenectomy and is also important for differential diagnosis in compressive pathologies of the axillary vessels and brachial plexus.

Search for Babesia bovis vaccine candidates

Babesia bovis is a tick-borne apicomplexan pathogen that remains an important constrain for the development of cattle industries worldwide. Effective control can be achieved by vaccination with live attenuated forms of the parasite, but they have several drawbacks and thus the development of alternative subunit vaccines, either based in recombinant versions of full size proteins or in recombinant or synthetic peptides containing combinations of protective B-cell and T-cell epitopes is needed. Our current strategies for the identification of vaccine candidate antigens include the identification of functionally relevant antigens, bioinformatics, and comparative genomics using the recently sequenced B. bovis genome. These led us to the functional and immunological characterization of members of the VMSA gene family, a group of well conserved putative cysteine and serine proteases, and to the definition of a surface exposed B-cell epitope present in the Merozoite Surface Antigen-2c. Work in progress is focused in defining additional epitopes, and to determine whether they are neutralization-sensitive. These approaches might unravel useful vaccine candidates for B. bovis, and will increase our understanding of the pathogenicity mechanisms of these and related hemoparasites.

Topology of the fibrinolytic system within the mural thrombus of human abdominal aortic aneurysms

Development and progression of acquired abdominal aortic aneurysms (AAAs) involve proteolytic activity. In the present study, we investigate the distribution of fibrinolytic system components within mural thrombi of human AAAs. 20 mural thrombi and the remaining AAA walls were dissected. The luminal, intermediate and abluminal thrombus layers, and media and adventitia were separately incubated in cell culture medium. Conditioned media were then analysed for plasminogen activators (PAs), plasminogen activator inhibitor-1 (PAI-1), free-plasmin, plasmin alpha(2)-antiplasmin complexes (PAPs) and D-dimers release. In parallel, PA and PAI-1 mRNA expression analysis was performed by RT-PCR. The study was completed by immunohistochemical localization of these components in AAA, ex vivo functional imaging using (99m)Tc-aprotinin as a ligand and measurement of PAP and D-dimer plasma levels. All fibrinolytic system components were present in each aneurysmal layer. However, the mural thrombus was the main source of active serine-protease release. Interestingly, the luminal layer of the thrombus released greater amounts of PAPs and D-dimers. This paralleled the preferential immunolocalization of plasminogen and PAs, and the (99m)Tc-aprotinin scintigraphic signal observed in the luminal pole of the thrombus. In contrast, mRNA expression analysis showed an exclusive synthesis of tPA and PAI-1 within the wall, whereas uPA mRNA was also expressed within the thrombus. Taken together, these results suggest that the increased plasma concentrations of PAPs and D-dimers found in AAA patients are related to mural thrombus proteolytic activity, thus explaining their known link with AAA progression. Components of the fibrinolytic system could also represent a target for functional imaging of thrombus activities in AAA.

Topology of the fibrinolytic system within the mural thrombus of human abdominal aortic aneurysms

Development and progression of acquired abdominal aortic aneurysms (AAAs) involve proteolytic activity. In the present study, we investigate the distribution of fibrinolytic system components within mural thrombi of human AAAs. 20 mural thrombi and the remaining AAA walls were dissected. The luminal, intermediate and abluminal thrombus layers, and media and adventitia were separately incubated in cell culture medium. Conditioned media were then analysed for plasminogen activators (PAs), plasminogen activator inhibitor-1 (PAI-1), free-plasmin, plasmin alpha(2)-antiplasmin complexes (PAPs) and D-dimers release. In parallel, PA and PAI-1 mRNA expression analysis was performed by RT-PCR. The study was completed by immunohistochemical localization of these components in AAA, ex vivo functional imaging using (99m)Tc-aprotinin as a ligand and measurement of PAP and D-dimer plasma levels. All fibrinolytic system components were present in each aneurysmal layer. However, the mural thrombus was the main source of active serine-protease release. Interestingly, the luminal layer of the thrombus released greater amounts of PAPs and D-dimers. This paralleled the preferential immunolocalization of plasminogen and PAs, and the (99m)Tc-aprotinin scintigraphic signal observed in the luminal pole of the thrombus. In contrast, mRNA expression analysis showed an exclusive synthesis of tPA and PAI-1 within the wall, whereas uPA mRNA was also expressed within the thrombus. Taken together, these results suggest that the increased plasma concentrations of PAPs and D-dimers found in AAA patients are related to mural thrombus proteolytic activity, thus explaining their known link with AAA progression. Components of the fibrinolytic system could also represent a target for functional imaging of thrombus activities in AAA.

Outbreak of Salmonella enterica serotype Manhattan infection associated with meat products, France, 2005

Between August 2005 and March 2006 in France, 69 cases of Salmonella enterica serotype Manhattan (Salmonella Manhattan) were reported, 51 (74%) of them from southeastern France. At the time of the alert (November 2005), 13 cases and 33 controls were interviewed. Cases were more likely than controls to have eaten pork sausages (OR=5.9, confidence interval CI [1.3; 26.9]) and beef (OR=9.3, CI [1.3; 68.6]). At the same time, 19 strains of Salmonella Manhattan isolated from meat products in southeastern France, reported to the French food safety agency (Afssa, Agence française de sécurité sanitaire des aliments) in September and November 2005, had an indistinguishable PFGE profile to the 7 human isolates of Salmonella Manhattan from the outbreak in southeastern France. Trace-back investigations revealed that pork samples came from one wholesaler whose pork products had tested positive for S. Manhattan during routine food testing in August 2005. This wholesaler supplied retail outlets in southeastern France. Additionally, a slaughterhouse supplying the wholesaler was inspected and widespread contamination with Salmonella spp. and S. Manhattan was found. Cooperation between the national agencies in charge of human health (Institut de veille sanitaire, InVS) and food safety (Afssa) allowed us to determine the most probable source of contamination and to take appropriate control measures.