Biomedical subjects

P Herbrink

Publications and source records attributed to P Herbrink.

At least 19 recordsLinked to original sources

PubMed2002

Cross-reactive anti-galactocerebroside antibodies and Mycoplasma pneumoniae infections in Guillain-Barré syndrome.

Anti-galactocerebroside (GalC) antibodies are reported to be present in GBS patients with preceding Mycoplasma pneumoniae (MP) infection. We investigated the presence of anti-GalC reactivity in serum of a large group of GBS patients using ELISA and compared this with healthy controls and individuals with an uncomplicated MP infection. Anti-GalC antibody reactivity was present in 12% of the GBS patients. Furthermore, anti-GalC antibodies were associated with MP infections, a relatively mild form of the disease and demyelinating features. Anti-GalC antibodies cross-reacted with MP antigen. In conclusion, anti-GalC antibodies in GBS patients may be induced by molecular mimicry with MP.

Autoantibodies↗

PubMed2001

Assessment of Helicobacter pylori vacA and cagA genotypes and host serological response.

Helicobacter pylori strains can be distinguished by genotyping of virulence-associated genes, such as vacA and cagA. Because serological discrimination between strain types would reduce the need for endoscopy, 61 patients carrying H. pylori were studied by vacA and cagA genotyping of H. pylori in gastric biopsy specimens and by detection of specific serum antibodies. Serological responses to H. pylori were determined by Helicoblot (versions 2.0 and 2.1). Antibodies to CagA also were determined by a rapid anti-CagA assay (Pyloriset screen CagA) as well as by two noncommercially developed enzyme immunoassays, each using a recombinant CagA protein. Assessment of performance of the Helicoblot assays indicated substantial interobserver variation, with kappa values between 0.20 and 0.93. There was no relationship between the serological profiles on the Helicoblot and the genotypes from the same patients, except for strong associations between the presence of anti-CagA and the cagA-positive and vacA s1 H. pylori genotypes. Detection of anti-CagA by the five different assays varied considerably, with kappa values ranging from 0.21 to 0.78. Using the cagA genotype as the "gold standard," the sensitivity and specificity of the anti-CagA assays varied from 71.4 to 85.7% and from 54.2 to 100%, respectively. Thus, serological profiles of antibodies to H. pylori are heterogeneous and, with the exception of anti-CagA antibodies, show no relation to the H. pylori vacA and cagA genotypes. Detection of anti-CagA antibodies is strongly dependent on the test used.

Antibodies, Bacterial↗

PubMed2001

Comparative study of preceding Campylobacter jejuni infection in Guillain-Barré syndrome in Japan and The Netherlands.

A comparative study was made in Japan and The Netherlands of the presence of preceding Campylobacter jejuni infections in Guillain-Barré syndrome (GBS). It was conducted in two laboratories using different serological criteria. The Japanese results showed no significant difference in the frequency of C jejuni infection between the Japanese (17/88, 19%) and Dutch (21/132, 16%) patients with GBS. The Dutch investigation showed a higher frequency in Dutch patients (45/132; 34%) than in Japanese patients(20/88; 23%), but the difference did not reach significance. Although the frequencies of preceding C jejuni infection have been reported to be higher in Asian countries than in western countries, the findings of this collaborative study show that the incidence of antecedent C jejuni infection in GBS in Japan is not higher than in The Netherlands and that serological assays vary considerably between laboratories.

Campylobacter Infections↗

PubMed2001

Prediction and diagnosis of type 1 diabetes using beta-cell autoantibodies.

The clinical manifestation of type 1 diabetes is the endpoint of a long-lasting immune-mediated destruction process of the B-cells. Autoantibodies originating from this process can be applied in the diagnosis and clinical discrimination of autoimmune diabetes as well as in the prediction of this disease. At clinical diagnosis between 80-90% of patients with type 1 diabetes are positive for antibodies to B-cell antigens, such as ICA and antibodies to glutamic acid decarboxylase or IA2. These antibodies can also be detected in the presymptomatic period before onset of the disease, and can thus be used to predict type 1 diabetes. Using a combination of antibodies, diabetes can be predicted in 70-80% of future cases of diabetes, with a positive predictive value between 30-80%, depending on the type of antibody tested for and the population studied. Between 5 and 30% of patients initially diagnosed with type 2 diabetes will show progression to insulin dependency and turn out to have type 1 within three years of diagnosis. It is clinically relevant to identify these patients early in the course of disease, as deterioration of metabolic control results in an increased risk for macro- and micro-vascular complications. Autoantibodies to glutamic acid decarboxylase or ICA are of high diagnostic sensitivity in these cases and are better predictors for future insulin dependency than biochemical or clinical parameters. Increasing knowledge on the applicability of antibodies for diabetes prediction and diagnosis and the development of commercial assays for antibodies to glutamic acid decarboxylase and IA2 antibodies has enabled the implementation of B-cell autoantibodies in routine diagnostic settings.

Autoantibodies↗

PubMed2000

Serological methods for diagnosis of Helicobacter pylori infection and monitoring of eradication therapy.

Several methods can be used to diagnose Helicobacter pylori infection. Invasive methods include detection of the bacterium in gastric biopsy specimens by culture, immunohistochemistry, rapid urease tests, or the polymerase chain reaction. Noninvasive or less invasive detection methods include the urea breath test and serological methods. The urea breath test is based on the detection of 13CO2 or 14CO2 in breath, produced by bacterial urease in the stomach after labelled urea is swallowed. Serological methods are based on the detection of Helicobacter pylori-specific antibodies in serum, saliva, or urine. In this review, the performance and diagnostic value of several serological methods, such as enzyme immunoassay, rapid office-based assays, and Western blot, will be discussed in relation to biopsy-based methods and the urea breath test. In addition, the value of serological assays for monitoring eradication of Helicobacter pylori infection following treatment will be discussed. The diagnostic performance of properly evaluated serological assays is comparable to that of biopsy-based methods and the urea breath test. To monitor eradication of Helicobacter pylori infection following therapy, quantitative enzyme immunoassays can be used, especially in patients with high pretreatment antibody titres.

Antibodies, Bacterial↗

PubMed1999

Humoral immune response against proteins E6 and E7 in cervical carcinoma patients positive for human papilloma virus type 16 during treatment and follow-up.

To investigate the humoral immune response to transforming proteins E6 and E7 of human papillomavirus type 16 before and after treatment and during follow-up, consecutive serum samples from 36 cervical cancer patients whose tumours were found to contain human papillomavirus type 16 DNA by use of the polymerase chain reaction were tested using in vitro translated proteins E6 and E7 in a radioimmunoprecipitation assay and in an E7 synthetic peptide enzyme immunoassay. Antibody levels against E6 and E7 as measured by radioimmunoprecipitation assay showed a nearly identical pattern. Seronegative patients remained seronegative throughout treatment and follow-up. Seropositive patients showed either a decrease in antibody level or stable antibody levels during treatment. In contrast to patients without evidence of disease at the end of the study, the majority of patients with recurrent disease showed increasing antibody levels during the follow-up period. These results indicate that, in patients who are seropositive before treatment antibody levels against E6 and E7 of human papillomavirus type 16 after treatment are closely linked to treatment response. The use of the more sensitive radioimmunoprecipitation assay did not lead to a better correlation of antibody levels with clinical disease status of the patients than the use of the enzyme immunoassay.

Antibodies, Viral↗

PubMed1998

The spectrum of antecedent infections in Guillain-Barré syndrome: a case-control study.

OBJECTIVE: To determine which antecedent infections are specifically associated with the Guillain-Barré syndrome (GBS). BACKGROUND: Infections with many agents have been reported preceding GBS. Some infections are related to specific clinical and immunologic subgroups in GBS. Most agents were reported in case reports and uncontrolled small series of GBS patients only, and their relation to GBS and its subgroups remains unclear. METHOD: A serologic study for 16 infectious agents in 154 GBS patients and 154 sex- and age-matched controls with other neurologic diseases. Acute phase, pretreatment samples were used from clinically well-defined GBS patients. The seasonal distribution of serum sampling in the GBS and control group was the same. RESULTS: Multivariate analysis showed that in GBS patients, infections with Campylobacter jejuni (32%), cytomegalovirus (13%), and Epstein-Barr virus (10%) were significantly more frequent than in controls. Mycoplasma pneumoniae infections occurred more often in GBS patients (5%) than in controls in univariate analysis. Infections with Haemophilus influenzae (1%), parainfluenza 1 virus (1%), influenza A virus (1%), influenza B virus (1%), adenovirus (1%), herpes simplex virus (1%), and varicella zoster virus (1%) were also demonstrated in GBS patients, but not more frequently than in controls. C. jejuni infections were associated with antibodies to the gangliosides GM1 and GD1b and with a severe pure motor form of GBS. Cytomegalovirus infections were associated with antibodies to the ganglioside GM2 and with severe motor sensory deficits. Other infections were not related to specific antiganglioside antibodies and neurologic patterns. CONCLUSIONS: Recent infections with C. jejuni, cytomegalovirus, Epstein-Barr virus, and M. pneumoniae are specifically related to GBS. The variety of infections may contribute to the clinical and immunologic heterogeneity of GBS.

Adenoviridae Infections↗

PubMed1997

A sero-epidemiological study of the relationship between sexually transmitted agents and cervical cancer in Honduras.

To investigate a possible cause-and-effect relationship between sexually transmitted diseases and cervical cancer, we performed a sero-epidemiological study on the presence of antibodies against a number of sexually transmitted agents (STAs) in patients with cervical cancer and their matched controls. In this study, we used serological techniques to investigate the presence of antibodies to cytomegalovirus, herpes simplex virus type 2, human immunodeficiency virus, Chlamydia trachomatis, Treponema pallidum and human papillomavirus (HPV) early protein E7 in sera from patients with cervical cancer, cervical intra-epithelial neoplasia and individually matched, healthy controls. The presence of antibodies to infectious agents other than HPV appeared not to be associated with risk of cervical neoplasia in either univariate or multivariate analysis. After adjustment for cytology, schooling and presence of HPV DNA in cervical scrapes, there was a significantly higher prevalence of antibodies to HPV-16 E7 protein in sera from patients with cervical cancer (OR = 3.6, 95% CI 1.0-12.9) than in healthy controls. The highest antibody prevalence was found among HPV-16 DNA-positive cervical cancer patients (33%). Our results indicate that in these study groups past infections with the STA considered seems to be of no apparent relevance for cervical carcinogenesis and that the HPV-16 anti-E7 response appears to be associated with cervical cancer.

Adult↗

PubMed1997

Measurement of cytokine antibodies. Test development.

Several assays have been used for detection of antibodies against cytokines. The choice of assay is greatly dependent on the intended goal, e.g. detection of naturally occurring antibodies or therapy induced antibodies. The different assays can be grouped in 2 categories. The interference or indirect assays are based on the detection of the test sample interference with the biological activity, with detection of the cytokine in EIA or with binding to cellular receptors. In direct assays cytokine antibodies are detected by binding to solid phase fixed cytokines, followed by incubation with a secondary enzyme-labelled anti-human Ig antibody or by binding to 125I-labelled cytokines in RIA.

Antibodies↗

PubMed1997

Relation between HPV-16 serology and clinico-pathological data in cervical carcinoma patients: prognostic value of anti-E6 and/or anti-E7 antibodies.

To investigate the clinical significance of the enhanced sensitivity of antibody detection by radio immunoprecipitation assays (RIPA), using in vitro translated HPV-16 E6 and E7 proteins, over synthetic-peptide enzyme-linked immunosorbent assay (ELISA), RIPA for HPV-16 E6 and E7 were performed. The results obtained with E6 and E7 RIPA were related to clinico-pathological data from cervical carcinoma patients positive for HPV type 16 DNA in their primary tumour. The data obtained with E6 and E7 RIPA were then compared to the results obtained using the E7/6-35 synthetic-peptide ELISA. The prevalence of antibodies to E6, E7, E6 and/or E7 and E6 and E7, as determined by RIPA, was significantly higher in cervical cancer patients than in both controls and cervical intraepithelial neoplasia patients. Odds ratios, calculated for cervical carcinoma patients versus controls, ranged from 7.4 to 15.4. Antibodies to E6 and/or E7 were largely restricted to patients with HPV DNA in their primary tumour. Analysis of the relation between prevalence of antibodies to E6 and E7 and clinico-pathological parameters was limited to 85 patients positive for HPV-16 DNA. The strongest relation with clinico-pathological data, such as lesion size, lymph node involvement, and prognosis, was found for E7 synthetic-peptide ELISA, whereas E6 and E7 RIPA did not reach significance. The significance of these findings is discussed.

Adult↗

PubMed1997

Detection of HPV-16 DNA by PCR in histologically cancer free lymph nodes from patients with cervical cancer.

The prognostic value of detection of human papillomavirus (HPV) type 16 DNA in histologically cancer free lymph nodes was assessed in left obturator lymph nodes from cervical cancer patients with HPV-16 positive primary tumours. HPV-16 DNA was detected by polymerase chain reaction in 12 of 35 patients with histologically cancer free lymph nodes. Of these 12 patients, only one developed a recurrence, suggesting HPV-16 DNA detection in cancer free lymph nodes has no prognostic value.

Carcinoma, Squamous Cell↗

PubMed1996

Analysis of IgG reactivity against Human Papillomavirus type-16 E7 in patients with cervical intraepithelial neoplasia indicates an association with clearance of viral infection: results of a prospective study.

IgG reactivity against the immunodominant region aa6-35 of Human Papillomavirus (HPV) type-16 E7 was determined in a peptide-based ELISA in a cohort study of women with initial mild to moderate cervical dyskaryosis. On the basis of HPV DNA patterns, as determined by PCR in cervical smears prior to IgG testing, HPV-16-positive patients were grouped as having either a cleared, a fluctuating, or a persistent HPV-16 infection. In a cross-sectional study at the start of serological follow-up, positive IgG reactivities were found more often in the total group of HPV-16-positive patients (20.0%) than in patients consistently typed as HPV-negative over a period of at least 12 months prior to testing (3.1%, p < 0.04). The highest proportion of positive responders was found in patients with a cleared HPV-16 infection (29.4%). Also, IgG reactivities found in HPV-16 clearance patients were significantly higher than in patients with a persistent infection (p < 0.008). In a subsequent longitudinal study over a period of up to 27 months, consistently positive reactivities were observed in patients with cleared viral infections who showed seroreactivity in the cross-sectional study, while mostly negative reactivities were found in patients with viral persistence. HPV-16 E7-specific IgG subclass responses were determined in a selection of 19 CIN and 11 HPV-16-positive cervical carcinoma (CeCa) patients with positive E7-specific IgG responses. IgG2 was predominant in the CIN patients, suggesting the presence of IFNgamma (Th1) at the site of HPV infection. In the CeCa patients IgG1 and IgG2 were produced equally, possibly indicating a rise in Th2 cytokines. Our data suggest that HPV-16 E7 IgG reactivity in a subset of CIN patients with viral clearance may result from successful Th1 responses.

Adult↗

PubMed1996

Campylobacter jejuni infections and anti-GM1 antibodies in Guillain-Barré syndrome.

The group of patients with Guillain-Barr'e syndrome (GBS) is very heterogenous with regard to antecedent infections, immunological parameters, clinical manifestations, and response to treatment. In this study, the presumed pathogenic factors anti-GM1 antibodies and Campylobacter jejuni infections were related to the clinical characteristics. Serum from 154 patients with GBS, 63 patients with other neurological diseases (OND), and 50 normal controls (NC) were tested for the presence of antibodies against GM1 and C. jejuni. Anti-GM1 antibodies were detected in 31 (20%) GBS patients, 5 (8%) OND patients, and in none of the NC. Evidence for a recent C. jejuni infection was found in 49 (32%) GBS patients and less often in OND patients (11%) or NC (8%). In GBS patients, the presence of anti-GM1 antibodies was significantly associated with C. jejuni infections. The subgroup of GBS patients with anti-GM1 antibodies suffered more often from a rapidly progressive and more severe neuropathy with predominantly distal distribution of weakness, without deficits of cranial nerves or sensory disturbances. The subgroup with C. jejuni infection also more often had a severe pure motor variant of GBS. Recovery of the patients with anti-GM1 antibodies and C. jejuni infections was not as good after plasma exchange compared with intravenous immunoglobulins.

Antibodies↗

PubMed1996

Comprehensive study of several general and type-specific primer pairs for detection of human papillomavirus DNA by PCR in paraffin-embedded cervical carcinomas.

We have compared the efficacies of three general primer pairs for the detection of human papillomavirus (HPV) DNA in formaldehyde-fixed paraffin-embedded carcinomas. The use of these primer pairs leads to underestimates of the HPV prevalence (GP5/6, 61.1%; CPI/IIG, 57.4%; MY09/11, 46.9%; combined, 72.8%). The efficacy of each primer pair seemed to be inversely correlated to the length of the amplimer produced. By using newly developed type-specific primer pairs (amplimer length, approximately 100 bp), an increase in HPV DNA detection (87.6%) was found.

Base Sequence↗

PubMed1995

Follow-up of antibody responses to human papillomavirus type 16 E7 in patients treated for cervical carcinoma.

A synthetic peptide comprising amino acids 6-35 of HPV-16 E7 was used in an ELISA to screen sera taken from 31 cervical carcinoma patients. Sera obtained before and during treatment, and in follow-up, were tested for the presence of antibodies to this peptide. Sixteen patients with negative pretreatment serum determination remained negative during treatment and follow-up. Of the 15 patients with positive pretreatment sera, 12 showed a decrease in anti-E7 6-35 antibody level during treatment. During follow-up an increase in anti-E7/6-35 antibody level was observed in 6 out of 7 patients with progressive or recurrent disease, whereas all patients who remained in complete remission showed stable or further decreasing antibody levels. During the course of disease of the 15 seropositive patients, serum anti-E7/6-35 antibody levels were compared with serum squamous cell carcinoma antigen (SCC-Ag) profiles, a clinically useful tumor marker in the management of cervical cancer patients. Similar patterns were observed in 10 out of 15 patients.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMed1995

Solid-phase C1q-directed bacterial capture followed by PCR for detection of Chlamydia trachomatis in clinical specimens.

An antigen capture system based on the binding of bacteria to solid-phase immobilized complement C1q followed by PCR for detection of Chlamydia trachomatis in clinical samples was developed and clinically evaluated. Comparison of C1q-directed antigen capture PCR with cell culture and direct PCR on 71 consecutive clinical specimens revealed an identical sensitivity. In this group, all 11 cell culture-positive samples were positive by direct PCR and C1q-directed antigen capture PCR. In addition, two samples found negative by cell culture were found positive by both direct PCR and C1q-directed antigen capture PCR. To further assess the sensitivity of C1q-directed antigen capture PCR, 20 clinical samples with one to five inclusions in cell culture and 20 clinical samples with 6 to 20 inclusions in cell culture were tested. Results obtained showed sensitivities of 95 and 90% for clinical samples with 6 to 20 and 1 to 5 inclusions in cell culture, respectively. Using C1q-coated solid phases, C1q-binding Chlamydia particles can be concentrated from large volumes with concomitant removal of inhibitors of PCR, allowing the use of large volumes of clinical samples for clinical testing. Since C1q has been shown to bind to a range of gram-negative bacteria, the newly developed technique has utility for a broad range of bacteria.

Antigens, Bacterial↗

PubMed1995

Antibodies to human papillomavirus type 16 E7 related to clinicopathological data in patients with cervical carcinoma.

AIMS: To investigate the correlation between antibodies to the transforming protein E7 of human papillomavirus (HPV) type 16 and clinicopathological indices in women with cervical squamous carcinoma. METHODS: A synthetic peptide of the HPV type 16 E7 protein (amino acids 6 to 35) was used to screen sera from 29 children, 130 women with cervical intraepithelial neoplasia, 443 women with cervical cancer, and 222 controls, for antibodies against this viral antigen. Bivariate and multivariate analyses were used to investigate the correlation between the serological status in the pretreatment sera and clinicopathological indices (size of the lesions, histological grade, stomal infiltration, vascular invasion, and nodal spread). Survival analysis was done using the Cox regression model for all FIGO stages and stages IB and ILA. RESULTS: Cervical carcinoma patients had a significantly higher prevalence of antibodies to synthetic peptide E7/6-35 than women with cervical intraepithelial neoplasia (17.7% v 7%, p < 0.005) or controls (17.7% v 11%, p < 0.05). Bivariate analysis of the data on the presence of anti-E7/6-35 antibodies in the pretreatment sera from these patients and clinicopathological indices showed a significant correlation between the presence of anti-E7/6-35 antibodies and the size of the lesion (p = 0.0009), histological grade (p = 0.0031), and lymph node metastasis (p = 0.01). 0.011). In addition, the Cox regression model, analysing four risk factors which can be determined before treatment, showed a significant correlation between the presence of anti-E7/6-35 antibodies and a worse prognosis (p = 0.003). Survival analysis revealed that both for all FIGO stages (p = 0.0005) and for stages IB and IIA alone (p = 0.0021), anti-E7/6-35 positive patients before treatment had a significantly shorter life expectancy. CONCLUSIONS: The presence of antibodies against E7/6-35 in pretreatment sera from patients with cervical carcinoma correlates with the size of the lesions, lymph node involvement, and a worse prognosis.

Adult↗

PubMed1994

In vivo adenovirus-mediated transfer of human CFTR cDNA to rhesus monkey airway epithelium: efficacy, toxicity and safety.

We have administered replication defective recombinant adenovirus harboring the human CFTR cDNA (Ad.CFTR) to lungs of Rhesus monkeys and assessed toxicity, efficiency of gene transfer and containment of recombinant adenovirus in the lungs. Gene transfer efficiencies, as measured by PCR analysis, were dose-dependent. Administration of low dose Ad.CFTR [1.5 x 10(7) plaque forming units (p.f.u.)] was not accompanied by any clinical chemical or histopathological changes. Mild to moderate multifocal perivascular and peribronchial lymphocytic infiltrates were found upon histopathological analysis only after administration of a high dose of recombinant adenovirus, although not accompanied by changes in clinical chemical parameters. Long-term expression (up to 128 days) was found after administration of recombinant adenovirus. Re-challenging of the monkeys treated with high-dose recombinant adenovirus resulted again in gene transfer at all levels of lungs and airways, without being accompanied by additional histopathological changes. Circulating anti-adenovirus antibodies were elicited. Animals treated with high-dose adenovirus secreted virus in pharynx and faeces for maximally 2 and 4 days after administration, respectively. These results show that recombinant adenovirus can be used for efficient delivery of genes into primate airway epithelium without signs of severe toxicity.

Adenoviridae↗