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1.
Eur J Surg Oncol ; 48(10): 2094-2103, 2022 10.
Article in English | MEDLINE | ID: mdl-35931589

ABSTRACT

INTRODUCTION: Clinical Quality Registries (CQRs) were initiated in order to compare clinical outcomes between hospitals or regions within a country. To get an overview of these CQRs worldwide the aim of this study was to identify these CQRs for gynecological oncology and to summarize their characteristics, processes and QI's and to establish whether it is feasible to make an international comparison in the future. METHODS: To identify CQRs in gynecological oncology a literature search in Pubmed was performed. All papers describing the use of a CQR were included. Administrative, epidemiological and cancer registries were excluded as these registries do not primarily serve to measure quality of care through QI's. The taskforce or contact person of the included CQR were asked to participate and share information on registered items, processes and indicators. RESULTS: Five nations agreed to collaborate: Australia, Denmark, Italy, the Netherlands and Sweden. Denmark, Netherlands and Sweden established a nationwide registry, collecting data on multiple tumor types, and various QI's. Australia and Italy included patients with ovarian cancer only. All nations had a different process to report feedback results to participating hospitals. CONCLUSION: CQRs serve the same purpose to improve quality of care but vary on different aspects. Although similarities are observed in the topics measured by the QI's, an international comparison was not feasible as numerators or denominators differ between registries. In order to compare on an international level it would be useful to harmonize these registries and to set an international standard to measure the quality of care with similar indicators.


Subject(s)
Registries , Humans , Forecasting , Italy , Netherlands , Sweden/epidemiology
3.
Gynecol Oncol ; 162(2): 331-338, 2021 08.
Article in English | MEDLINE | ID: mdl-34147284

ABSTRACT

OBJECTIVES: The challenge when performing cytoreductive surgery (CRS) is to balance the benefits and risks. The aim of this study was to report short term postoperative morbidity and mortality in relation to surgical outcome in patients undergoing primary debulking surgery (PDS) or interval debulking (IDS) surgery in the Netherlands. METHODS: The Dutch Gynecological Oncology Audit (DGOA) was used for retrospective analysis. Patients undergoing PDS or IDS between January 1st, 2015 - December 31st, 2018 were included. Outcome was frequency of postoperative complications. Median time to adjuvant chemotherapy and severity of complications were related to outcome of CRS. Complications with Clavien-Dindo ≥3 were analyzed per region and case mix corrected. Statistical analysis was performed with R.Studio. RESULTS: 1027 patients with PDS and 1355 patients with IDS were included. Complications with re-invention were significantly higher in PDS compared to IDS (5.7% vs. 3.6%, p = 0.048). Complete cytoreduction was 69.7% in PDS and 62.1% IDS, p < 0.001. Time to adjuvant chemotherapy was 49 days in patients with complete CRS and a complication with re-intervention. Regional variation for severe complications showed one region outside confidence intervals. CONCLUSIONS: Higher complete cytoreduction rate in the PDS group indicates that the correct patients have been selected, but is associated with a higher percentage of complication with re-intervention. As result, time to start adjuvant chemotherapy is longer in this group. Maintaining a balance in aggressiveness of surgery and outcome of the surgical procedure with respect to severe complications is underlined. Bench marked data should be discussed nationally to improve this balance.


Subject(s)
Cytoreduction Surgical Procedures/adverse effects , Ovarian Neoplasms/therapy , Postoperative Complications/epidemiology , Time-to-Treatment/statistics & numerical data , Adolescent , Adult , Aged , Aged, 80 and over , Chemotherapy, Adjuvant/statistics & numerical data , Cytoreduction Surgical Procedures/methods , Female , Geography , Humans , Middle Aged , Neoplasm Staging , Netherlands/epidemiology , Ovarian Neoplasms/diagnosis , Ovarian Neoplasms/pathology , Postoperative Complications/diagnosis , Postoperative Complications/etiology , Retrospective Studies , Severity of Illness Index , Young Adult
4.
Eur J Surg Oncol ; 47(7): 1691-1697, 2021 07.
Article in English | MEDLINE | ID: mdl-33581966

ABSTRACT

INTRODUCTION: The Dutch Gynecological Oncology Audit (DGOA) was initiated in 2014 to serve as a nationwide audit, which registers the four most prevalent gynecological malignancies. This study presents the first results of clinical auditing for ovarian cancer in the Netherlands. METHODS: The Dutch Gynecological Oncology Audit is facilitated by the Dutch Institute of Clinical Auditing (DICA) and run by a scientific committee. Items are collected through a web-based registration based on a set of predefined quality indicators. Results of quality indicators are shown, and benchmarked information is given back to the user. Data verification was done in 2016. RESULTS: Between January 01, 2014 and December 31, 2018, 6535 patients with ovarian cancer were registered. The case ascertainment was 98.3% in 2016. The number of patients with ovarian cancer who start therapy within 28 days decreased over time from 68.7% in 2014 to 62.7% in 2018 (p < 0.001). The percentage of patients with primary cytoreductive surgery decreased over time (57.8%-39.7%, P < 0.001). However, patients with complete primary cytoreductive surgery improved over time (53.5%-69.1%, P < 0.001). Other quality indicators did not significantly change over time. CONCLUSION: The Dutch Gynecological Oncology Audit provides valuable data on the quality of care on patients with ovarian cancer in the Netherlands. Data show variation between hospitals with regard to pre-determined quality indicators. Results of 'best practices' will be shared with all participants of the clinical audit with the aim of improving quality of care nationwide.


Subject(s)
Cytoreduction Surgical Procedures/statistics & numerical data , Medical Audit/methods , Ovarian Neoplasms/surgery , Quality Improvement , Adolescent , Adult , Aged , Aged, 80 and over , Female , Humans , Middle Aged , Netherlands , Registries
5.
Eur J Surg Oncol ; 47(1): 101-107, 2021 01.
Article in English | MEDLINE | ID: mdl-31128948

ABSTRACT

INTRODUCTION: The addition of hyperthermic intraperitoneal chemotherapy (HIPEC) to interval cytoreductive surgery (CRS) improves recurrence-free (RFS) and overall survival (OS) in patients with FIGO stage III ovarian cancer. We evaluated the effect of HIPEC on patient's health-related quality of life (HRQoL) in the OVHIPEC trial. MATERIALS AND METHODS: OVHIPEC was a multicentre, open-label, randomized phase III trial for patients with stage III ovarian cancer. Patients were randomly assigned (1:1) to receive interval CRS with or without HIPEC with cisplatin. HRQoL was assessed using the EORTC QLQ-C30, and the ovarian (QLQ-OV28) and colorectal cancer (QLQ-CR38) modules. HRQoL questionnaires were administered at baseline, after surgery, after end of treatment, and every three months thereafter. HRQoL was a secondary endpoint, with the prespecified focus on the QLQ-C30 summary score and symptom scores on fatigue, neuropathy and gastro-intestinal symptoms. HRQoL was analysed using linear and non-linear mixed effect models. RESULTS: In total, 245 patients were randomized. One-hundred-ninety-seven patients (80%) completed at least one questionnaire. No significant difference over time in the QLQ-C30 summary scores was observed between the study arms (p-values for linear and non-linear growth: p > 0.133). The pattern over time for fatigue, neuropathy and gastro-intestinal symptoms did not significantly differ between treatment arms. CONCLUSION: The addition of HIPEC to interval CRS does not negatively impact HRQoL in patients with stage III ovarian cancer who are treated with interval CRS due to the extent of disease. These HRQoL results, together with the improvement in RFS and OS, support the viability of HIPEC as an important treatment option in this patient population. CLINICALTRIALS. GOV NUMBER: NCT00426257. EUDRACT NUMBER: 2006-003466-34.


Subject(s)
Cytoreduction Surgical Procedures , Hyperthermic Intraperitoneal Chemotherapy , Ovarian Neoplasms/therapy , Quality of Life , Aged , Belgium , Carboplatin/administration & dosage , Combined Modality Therapy , Female , Humans , Middle Aged , Neoplasm Staging , Netherlands , Ovarian Neoplasms/pathology , Paclitaxel/administration & dosage , Surveys and Questionnaires
6.
Gynecol Oncol ; 159(3): 706-711, 2020 12.
Article in English | MEDLINE | ID: mdl-33019981

ABSTRACT

OBJECTIVE: Decrease in skeletal muscle index (SMI) during neoadjuvant chemotherapy (NACT) has been associated with worse outcome in patients with advanced ovarian cancer. To validate these findings, we tested if a decrease in SMI was a prognostic factor for a homogenous cohort of patients who received NACT in the randomized phase 3 OVHIPEC-trial. METHODS: CT-scans were performed at baseline and after two cycles of neoadjuvant chemotherapy in stage III ovarian cancer patients. The SMI (skeletal muscle area in cm2 divided by body surface area in m2) was calculated using SliceOMatic software. The difference in SMI between both CT-scans (ΔSMI) was calculated. Cox-regression analyses were performed to analyze the independent effect of a difference in SMI (ΔSMI) on outcome. Log-rank tests were performed to plot recurrence-free (RFS) and overall survival (OS). The mean number of adverse events per patient were compared between groups using t-tests. RESULTS: Paired CT-scans were available for 212 out of 245 patients (87%). Thirty-four of 74 patients (58%) in the group with a decrease in ΔSMI and 73 of 138 of the patients (53%) in the group with stable/increase in ΔSMI had died. Median RFS and OS did not differ significantly (p = 0.297 and p = 0.764) between groups. Patients with a decrease in SMI experienced more pre-operative adverse events, and more grade 3-4 adverse events. CONCLUSION: Decreased SMI during neoadjuvant chemotherapy was not associated with worse outcome in patients with stage III ovarian cancer included in the OVHIPEC-trial. However, a strong association between decreasing SMI and adverse events was found.


Subject(s)
Drug-Related Side Effects and Adverse Reactions/epidemiology , Neoadjuvant Therapy/adverse effects , Neoplasm Recurrence, Local/epidemiology , Ovarian Neoplasms/therapy , Sarcopenia/epidemiology , Aged , Body Mass Index , Clinical Trials, Phase III as Topic , Cytoreduction Surgical Procedures , Disease-Free Survival , Drug-Related Side Effects and Adverse Reactions/etiology , Female , Humans , Middle Aged , Multicenter Studies as Topic , Muscle, Skeletal/diagnostic imaging , Neoplasm Recurrence, Local/prevention & control , Neoplasm Staging , Ovarian Neoplasms/complications , Ovarian Neoplasms/diagnosis , Ovarian Neoplasms/mortality , Preoperative Period , Prognosis , Prospective Studies , Randomized Controlled Trials as Topic , Retrospective Studies , Risk Assessment/statistics & numerical data , Risk Factors , Sarcopenia/diagnosis , Sarcopenia/etiology , Tomography, X-Ray Computed
7.
Tijdschr Psychiatr ; 56(4): 228-36, 2014.
Article in Dutch | MEDLINE | ID: mdl-24807382

ABSTRACT

BACKGROUND: By means of repeated, well-supported measurements of clinical dynamic indicators from the Historical, Clinical and Future - 30 (HKT-30) it is possible to monitor behavioural changes on the basis of risks and needs. The addition of extra score parameters allows us to distinguish client-specific risks and needs. In treatment evaluation it is important to visualise changes in these indicators of treatment evaluation because they are the key to the clinical decision-making process that determines further treatment and rehabilitation. AIM: To investigate whether HKT-30 indicators can be used to measure and visualise behavioral changes for the purpose of treatment evaluation. METHOD: A case study is used to illustrate how clinicians at the Forensic Psychiatric Clinic (FPK), De Woenselse Poort, ascertain risks, needs and changes and clarify these factors for the purpose of treatment evaluation and clinical decision-making. RESULTS: Routine treatment evaluation aided by visualised clinical HKT-30 indicators give the treatment team and the client a clearer picture of the behavioral changes for which the forensic treatment was prescribed. This evaluation provides significant starting-points for clinical decision making. CONCLUSION: Routine treatment evaluation along with a suitably adjusted HKT-30 make behavioural changes visible, render clinical decisions more transparent and provide valuable starting-points for a dialogue with the client about his treatment.


Subject(s)
Decision Making , Forensic Psychiatry/instrumentation , Mental Disorders/therapy , Patient Outcome Assessment , Risk Assessment , Adult , Forensic Psychiatry/methods , Humans , Male , Mental Disorders/psychology , Needs Assessment , Predictive Value of Tests , Psychiatric Status Rating Scales , Psychometrics/instrumentation , Psychometrics/methods , Psychotherapy/methods , Risk Factors , Risk Reduction Behavior , Social Behavior
8.
Eur J Clin Invest ; 40(1): 4-10, 2010 Jan.
Article in English | MEDLINE | ID: mdl-19843156

ABSTRACT

BACKGROUND: Recent studies indicate a role for complement in the pathogenesis of aortic valve disease. However, the role of naturally occurring anti-complement mediators in this context is unknown. In this study, we have analysed this in three different pathological conditions of the aortic valve: degeneration, atherosclerosis and bacterial endocarditis. MATERIALS AND METHODS: Human aortic valves were obtained at autopsy (n = 30): 5 control valves, 10 aortic valves with atherosclerotic changes, 10 aortic valves with degenerative changes and 5 degenerative changed aortic valves with bacterial infection. These valves were analysed immunohistochemically for the presence of activated complement (C3d and C5b9) and the complement inhibitors C1-inh and clusterin. Areas of positivity were then quantified. RESULTS: C3d, C5b9 and the complement inhibitors C1-inh and clusterin depositions were mainly found in the endothelium and extracellular matrix in aortic valves. All these mediators were already present in control valves, but the area of positivity increased significantly in response to the different diseases, with the highest increase in response to bacterial endocarditis. Interestingly, in all three aortic diseases, the depositions of complement were significantly more widespread than that of their inhibitors. CONCLUSIONS: Our study indicates that anti-complement mediators (C1-inh and clusterin) are deposited in diseased aortic valves together with activated complement, indicating an existing counter response against complement locally in the valve. However, deposition of activated complement is significantly more widespread than that of its inhibitors, which could explain ongoing inflammation in those diseased aortic valves.


Subject(s)
Aortic Valve/immunology , Atherosclerosis/immunology , Complement System Proteins/metabolism , Inflammation , Adult , Aged , Aged, 80 and over , Aortic Valve/metabolism , Aortic Valve/pathology , Atherosclerosis/metabolism , Atherosclerosis/pathology , Clusterin/analysis , Complement C1 Inactivator Proteins/analysis , Complement C1 Inhibitor Protein , Complement C3d/analysis , Complement Membrane Attack Complex/analysis , Endothelium, Vascular/metabolism , Endothelium, Vascular/pathology , Extracellular Matrix/metabolism , Female , Humans , Immunohistochemistry , Male , Middle Aged
9.
J Clin Microbiol ; 46(10): 3215-21, 2008 Oct.
Article in English | MEDLINE | ID: mdl-18685007

ABSTRACT

Using a case control approach, we performed a two-way comparison study between GP5+/6+-PCR and HPV SPF(10)-Line Blot 25 (SPF(10)) assays for detection of 14 types of high-risk human papillomavirus (hrHPV) in samples from women with normal cytology results who had or developed grade 3 cervical intraepithelial neoplasia (CIN 3). Samples were pooled from two cohorts, i.e., women participating in population-based screening and women attending a gynecological outpatient clinic. Cases (n = 45) were women with histologically confirmed CIN 3 diagnosed within a median follow-up time of 2.7 (range, 0.2 to 7.9) years. Control samples were from women (n = 264) who had developed CIN 1 lesions at maximum (median follow-up at 5.8 [range, 0 to 10] years). Identical numbers of cases tested positive for 1 or more of the 14 hrHPV types by both systems (40/45; McNemar; P = 1.0). Conversely, SPF(10) scored significantly more controls as hrHPV positive than did GP5+/6+-PCR (95/264 versus 29/264; McNemar; P < 0.001). Consequently, women with normal cytology results and an hrHPV GP5+/6+-PCR-positive test exhibited a risk of CIN 3 that was 4.5 times higher (odds ratio [OR], 65; 95% confidence interval [95%CI], 24 to 178) than that seen for women with an hrHPV-positive SPF(10) test (OR, 14; 95%CI, 5 to 38)). Similar results were obtained after analysis of both cohorts separately. Discrepancy analysis by viral load assessment for the most common discordant hrHPV types (HPV16, -18, and -52) showed that samples which were SPF(10) positive only for these types had viral loads significantly lower than those for samples that were positive by both assays (analysis of variance; P < or = 0.006). Our data indicate that GP5+/6+-PCR has a better clinical performance than SPF(10) for women who are diagnosed with CIN 3 after prior normal cytology results. The extra positivity scored by SPF(10) mainly involved infections characterized by low viral loads that do not result in CIN 3.


Subject(s)
Nucleic Acid Hybridization/methods , Papillomaviridae/isolation & purification , Papillomavirus Infections/diagnosis , Polymerase Chain Reaction/methods , Uterine Cervical Dysplasia/virology , Uterus/virology , Adult , Case-Control Studies , Female , Humans , Middle Aged , Papillomaviridae/genetics , Papillomavirus Infections/virology , Predictive Value of Tests , Sensitivity and Specificity , Viral Proteins/genetics
10.
Int J Gynecol Cancer ; 18(6): 1381-5, 2008.
Article in English | MEDLINE | ID: mdl-18298565

ABSTRACT

Women who present with cervical carcinoma during pregnancy pose for us a clinical problem. In general, three treatment options exist: (i) radical hysterectomy with termination of pregnancy, (ii) a planned delay, or (iii) chemotherapy until lung maturation has occurred, both followed by a radical hysterectomy. Vaginal radical trachelectomy is an alternative approach to preserve the pregnancy. We report on a woman with a stage IBI cervical carcinoma, diagnosed at 16 weeks of gestation treated with vaginal radical trachelectomy. At a gestational age of 36 weeks, a cesarean section was performed, followed by radical hysterectomy. Follow-up of 9 months is uneventful for both the mother and the child. The vaginal radical trachelectomy is a new approach in the treatment of cervical carcinoma during pregnancy.


Subject(s)
Carcinoma, Squamous Cell/surgery , Uterine Cervical Neoplasms/surgery , Adult , Carcinoma, Squamous Cell/pathology , Female , Humans , Magnetic Resonance Imaging , Pregnancy , Uterine Cervical Neoplasms/pathology
11.
Br J Cancer ; 98(1): 165-7, 2008 Jan 15.
Article in English | MEDLINE | ID: mdl-18182979

ABSTRACT

Over the period 1989-2003, the incidence of cervical adenocarcinoma (n=1615) was stable whereas that of cervical adenocarcinoma in situ (n=1884) significantly decreased (P=0.008), mainly caused by adenocarcinoma in situ lesions with a concurrent squamous dysplasia.


Subject(s)
Adenocarcinoma/epidemiology , Carcinoma in Situ/epidemiology , Carcinoma, Squamous Cell/epidemiology , Uterine Cervical Neoplasms/epidemiology , Adenocarcinoma/diagnosis , Adolescent , Adult , Carcinoma in Situ/diagnosis , Carcinoma, Squamous Cell/diagnosis , Female , Humans , Incidence , Middle Aged , Netherlands/epidemiology , Prognosis , Uterine Cervical Neoplasms/diagnosis
14.
Int J Gynecol Cancer ; 16(2): 615-9, 2006.
Article in English | MEDLINE | ID: mdl-16681735

ABSTRACT

Early treatment of cervical intraepithelial neoplasia (CIN) significantly reduces the risk of invasive cancerous progression. Residual and recurrent high-grade CIN should be detected and retreated in an early phase. Therefore, a postsurgery cytologic follow-up protocol was introduced at 3, 6, 9, and 12 months and yearly thereafter for 5 years. The aim of this study is to evaluate the long-term experience in treating high-grade CIN using large-loop excision of the transformation zone (LLETZ). Additionally, the long-term follow-up in this study gains the opportunity to document the pattern of disease recurrence beyond 5 years. The average follow-up of the 1696 women included in this study was 6.5 years. Overall, 8.5% of the patients who underwent LLETZ showed a high-grade repetitive CIN and three patients had invasive carcinoma. Eighty percent of those lesions were probably residual, whereas 20% of all high-grade repetitive lesions appeared more than 2 years after initial surgery and were considered recurrent lesions. Half of the recurrent lesions occurred more than 5 years after LLETZ.


Subject(s)
Uterine Cervical Dysplasia/surgery , Uterine Cervical Neoplasms/surgery , Adolescent , Adult , Aged , Diathermy , Female , Follow-Up Studies , Humans , Middle Aged , Neoplasm Recurrence, Local , Neoplasm, Residual , Risk Factors , Time Factors , Uterine Cervical Neoplasms/pathology , Vaginal Smears , Uterine Cervical Dysplasia/pathology
15.
Rev Sci Tech ; 23(3): 761-75, 2004 Dec.
Article in English | MEDLINE | ID: mdl-15861871

ABSTRACT

Determining the temporal relationship between climate and epidemics of Culicoides-borne viral disease may allow control and surveillance measures to be implemented earlier and more efficiently. In Israel, outbreaks of bluetongue (BT) have occurred almost annually since at least 1950, with severe episodes occurring periodically. In this paper, the authors model a twenty-year time-series of BT outbreaks in relation to climate. Satellite-derived correlates of low temperatures and high moisture levels increased the number of outbreaks per year. This is the first study to find a temporal relationship between the risk of Culicoides-borne disease and satellite-derived climate variables. Climatic conditions in the year preceding a BT episode, between October and December, coincident with the seasonal peak of vector abundance and outbreak numbers, appeared to be more importantthan spring or early summer conditions in the same year as the episode. Since Israel is an arid country, higher-than-average moisture levels during this period may increase the availability of breeding sites and refuges for adult Culicoides imicola vectors, while cooler-than-average temperatures will increase fecundity, offspring size and survival through adulthood in winter, which, in turn, increases the size of the initial vector population the following year. The proportion of variance in the annual BT outbreak time-series resulting from climate factors was relatively low, at around 20%. This was possibly due to temporal variation in other factors, such as viral incursions from surrounding countries and levels of herd immunity. Alternatively, since most BT virus (BTV) circulation in this region occurs silently, in resistant breeds of local sheep, the level of transmission is poorly correlated with outbreak notification so that strong relationships between BTV circulation and climate, if they exist, are obscured.


Subject(s)
Bluetongue virus/growth & development , Bluetongue/epidemiology , Ceratopogonidae/virology , Climate , Disease Outbreaks/veterinary , Insect Vectors/virology , Animals , Bluetongue/prevention & control , Bluetongue virus/classification , Disease Vectors , Female , Incidence , Israel/epidemiology , Male , Models, Biological , Population Density , Predictive Value of Tests , Risk Assessment , Seasons , Sentinel Surveillance/veterinary , Sheep , Vaccination/statistics & numerical data , Vaccination/veterinary
17.
Br J Cancer ; 87(4): 373-6, 2002 Aug 12.
Article in English | MEDLINE | ID: mdl-12177771

ABSTRACT

In the last few years much attention has been focused on the implementation of human papillomavirus detection in population based screening programmes to identify women at risk for cervical cancer. Short-term fluctuations in prevalence of human papillomavirus were investigated within a single menstrual cycle. The highest prevalence was found at the follicular phase (55%), whereas the cumulative prevalence was 75%.


Subject(s)
Cervix Uteri/virology , Menstrual Cycle , Papillomaviridae/isolation & purification , Adult , Female , Follicular Phase , Humans , Prevalence
18.
Vet Rec ; 151(4): 117-21, 2002 Jul 27.
Article in English | MEDLINE | ID: mdl-12180660

ABSTRACT

In two epidemics of bovine ephemeral fever (BEF) in Israel, one in 1990 and one in 1999, the virus was probably carried by vectors transported by air currents across the Rift Valley and through the Red Sea trough. The disease broke out under optimal ecological conditions among vulnerable cattle populations and spread rapidly; it developed in the spring and summer and ended soon after the daily average ambient temperature fell below 16 degrees C in late autumn. The proportion of herds affected reached 78.4 and 97.7 per cent in 1990 and 1999, respectively. The highest rates of incidence, morbidity and mortality were recorded in dairy cattle herds in the Jordan Valley, the initial focus of the outbreaks, with a morbidity of 20 and 38.6 per cent in 1990 and 1999, respectively, and mortality among the affected animals of 2 and 8.6 per cent in 1990 and 1999, respectively. In 1991, the disease recurred sporadically in the central and southern regions of Israel in only three herds, but in 2000 the disease returned on an epidemic scale, and 85 per cent of herds were affected, with morbidity and mortality rates of 4-3 and 0-3 per cent, respectively. In the 1999 epidemic, the morbidity rate decreased from 38-6 per cent on average in the Jordan Valley to 12.8 per cent in the inner valleys and 5.3 per cent on the Mediterranean coastal plain, but the mortality rate increased from 8-6 per cent in the Jordan Valley to 14-3 per cent in the inner valleys, and to 28 per cent on the Mediterranean coastal plain, where the outbreak declined. An average of 2-7 per cent of the animals experienced a second attack of the disease two to six weeks later. The epidemic in 2000 was milder and shorter than that in 1999. All the cattle affected in both outbreaks were more than three months old. The vector(s) is not known for certain but the available evidence indicates that mosquitoes, and not Culicoides species, are the natural vectors of BEF virus in Israel.


Subject(s)
Ephemeral Fever Virus, Bovine/pathogenicity , Ephemeral Fever/epidemiology , Age Factors , Animals , Cattle , Disease Transmission, Infectious/veterinary , Epidemiologic Studies , Female , Israel/epidemiology , Morbidity , Mortality , Risk Factors
19.
J Immunol ; 167(12): 6849-58, 2001 Dec 15.
Article in English | MEDLINE | ID: mdl-11739502

ABSTRACT

Ag presentation via HLA class II molecules in B lymphocytes depends on the coordinated action of HLA-DM, the catalyst of class II-peptide loading, and HLA-DO, a pH-dependent modulator of DM, the expression of which is almost completely restricted to B lymphocytes. The relative expression levels of both class II modulators are critical for the composition of the HLA class II peptide repertoire. The data in this work demonstrate that DO and DM expression are both dependent on the cellular activation status in primary human B lymphocytes. In vivo low-density activated primary human B lymphocytes show a prominent reduction in DO and DM expression when compared with high-density resting primary B lymphocytes. In vitro, reduction of DO and DM expression can be induced by B lymphocyte activation via the B cell receptor or by use of the phorbol ester, PMA. Specific inhibition of protein kinase C resulted in a significant reduction of HLA-DO and is potentially due to protein degradation in lysosomal compartments as the phenomenon is reversed by chloroquine. Thus, the expression of the dedicated HLA class II chaperone DM and its pH-dependent modulator DO is regulated and tightly controlled by the activation status of the B lymphocyte.


Subject(s)
B-Lymphocytes/immunology , HLA-D Antigens/metabolism , Lymphocyte Activation , Antigens, Differentiation, B-Lymphocyte/analysis , Antigens, Differentiation, B-Lymphocyte/metabolism , Blotting, Western , Cells, Cultured , Chloroquine/pharmacology , Down-Regulation , Enzyme Inhibitors/pharmacology , HLA-DR Antigens/metabolism , Histocompatibility Antigens Class II/metabolism , Humans , Immunophenotyping , Indoles/pharmacology , Protein Kinase C/antagonists & inhibitors , Protein Kinase C/physiology , Tumor Cells, Cultured
20.
J Immunol ; 167(2): 884-92, 2001 Jul 15.
Article in English | MEDLINE | ID: mdl-11441095

ABSTRACT

MHC class II molecules bind antigenic peptides in the late endosomal/lysosomal MHC class II compartments (MIIC) before cell surface presentation. The class II modulatory molecules HLA-DM and HLA-DO mainly localize to the MIICs. Here we show that DM/DO complexes continuously recycle between the plasma membrane and the lysosomal MIICs. Like DMbeta and the class II-associated invariant chain, the DObeta cytoplasmic tail contains potential lysosomal targeting signals. The DObeta signals, however, are not essential for internalization of the DM/DO complex from the plasma membrane or targeting to the MIICs. Instead, the DObeta tail determines the distribution of both DM/DO and class II within the multivesicular MIIC by preferentially localizing them to the limiting membrane and, in lesser amounts, to the internal membranes. This distribution augments the efficiency of class II antigenic peptide loading by affecting the efficacy of lateral interaction between DM/DO and class II molecules. Sorting of DM/DO and class II molecules to specific localizations within the MIIC represents a novel way of regulating MHC class II Ag presentation.


Subject(s)
Antigen Presentation/immunology , HLA-D Antigens/metabolism , Transport Vesicles/immunology , Transport Vesicles/metabolism , Amino Acid Motifs/immunology , Amino Acid Sequence , Cell Compartmentation/immunology , Cell Membrane/immunology , Cell Membrane/metabolism , Cell Membrane/ultrastructure , Cytoplasm/immunology , Cytoplasm/metabolism , Cytoplasm/ultrastructure , HLA-D Antigens/physiology , HLA-D Antigens/ultrastructure , HLA-DR Antigens/metabolism , HLA-DR Antigens/ultrastructure , Humans , Lysosomes/immunology , Lysosomes/metabolism , Macromolecular Substances , Microscopy, Immunoelectron , Molecular Sequence Data , Protein Structure, Tertiary , Protein Transport/immunology , Signal Transduction/immunology , Transport Vesicles/ultrastructure , Tumor Cells, Cultured
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