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Biomedical subjects

U Wurster

Publications and source records attributed to U Wurster.

At least 19 recordsLinked to original sources
PubMed2006

Monoaminergic neurotransmission is altered in hepatitis C virus infected patients with chronic fatigue and cognitive impairment.

BACKGROUND: The majority of patients with hepatitis C virus (HCV) infection suffer from disabling fatigue, cognitive dysfunction, and quality of life reduction. Meanwhile, there is increasing evidence that HCV infection can affect brain function. Recent studies have shown that fatigue and psychomotor slowing may resolve in patients with hepatitis C after treatment with ondansetron. This observation indicates alteration of serotonergic neurotransmission in HCV infected patients with chronic fatigue. METHODS: Data from 20 HCV infected patients who were referred to our clinic because of disabling fatigue and cognitive decline of unknown cause were analysed retrospectively. Patients had undergone a diagnostic programme, including clinical and psychometric examination, electroencephalogram (EEG), magnetic resonance imaging of the brain, cerebrospinal fluid analysis, and I-123-beta-CIT (2beta-carbomethoxy-3-beta-(4-[(123)I]iodophenyl)tropane) single photon emission computerised tomography (SPECT) studies of serotonin and dopamine transporter binding capacity. RESULTS: All patients had pathological results on the fatigue impact scale. Two thirds of patients showed pathological attention test results. EEG, magnetic resonance imaging, and cerebrospinal fluid analysis were normal. Pathological dopamine transporter binding was present in 12/20 (60%) patients and pathological serotonin transporter binding in 8/19 (50%) patients. Patients with normal SPECT results did not significantly differ from controls with regard to psychometric test results. Interestingly, patients with both decreased serotonin and dopamine transporter binding showed significantly impaired performance in most of the tests applied. Comorbidity that could have impaired cerebral function was excluded in all patients. CONCLUSION: Our findings indicate alteration of serotonergic and dopaminergic neurotransmission in HCV infected patients with chronic fatigue and cognitive impairment.

Adult↗
PubMed2000

Free and protein bound leptin are distinct and independently controlled factors in energy regulation.

AIMS/HYPOTHESIS: Leptin exerts important regulating effects on energy homeostasis and could have a central role in our understanding of obesity, diabetes mellitus and the metabolic syndrome. Leptin circulates in a free and protein bound form. The aim of the present study was to test whether both fractions of the leptin system can be selectively regulated and thus serve independent physiological roles. METHODS: Using specific radioimmunoassays we measured both leptin components in relation to BMI in healthy subjects before and after weight reduction and in hyperthyroid patients during correction of thyrotoxicosis. In the latter group body composition and resting energy expenditure was monitored. In addition, we measured serum and cerebrospinal fluid concentrations of free and bound leptin in patients with neurological disorders. RESULTS: Under all conditions free leptin concentrations reflected body fat mass. Bound leptin concentrations decreased during weight reduction but also after treatment of hyperthyroidism despite an increase in fat mass. Direct measurement of resting energy expenditure and bound leptin in hyperthyroid patients and under thyrostatic treatment showed a significant positive correlation of both variables. In contrast to free leptin whose transport into the cerebrospinal fluid appears to be saturated at low physiological concentrations of serum free leptin, bound leptin concentrations in the cerebrospinal fluid increased in parallel to serum concentrations over the whole physiologically relevant range. CONCLUSION/INTERPRETATION: Our data indicate a distinct role of free and bound leptin in the feedback regulating energy intake and expenditure and could have important implications for our understanding of the physiology and pathophysiology of leptin-dependent signalling.

Adolescent↗
PubMed1999

Expression of matrix metalloproteinase-9 and its inhibitors in mononuclear blood cells of patients with multiple sclerosis.

Inflammatory mononuclear cells invading the nervous system in demyelinating diseases are supposed to be a major source of matrix metalloproteinases which are involved in damaging the blood-brain barrier and facilitating cellular migration through the extracellular matrix. Several studies revealed a crucial role of 92 kDa gelatinase (matrix metalloproteinase-9, MMP-9) in these processes. In this study, we determined MMP-9, TIMP-1 and TIMP-2 (tissue inhibitor of metalloproteinase) mRNA in peripheral blood mononuclear cells of multiple sclerosis (MS) patients by competitive reverse transcription PCR and plasma protein levels by ELISA. In active MS patients, both with relapsing-remitting and chronic progressive disease MMP-9 mRNA and plasma protein levels were significantly increased compared to healthy controls. No significant changes in mRNA expression were found for TIMP-1 and TIMP-2. However, unbound TIMP-2 in plasma was significantly higher in MS patients compared to healthy controls. MMP-9 and TIMP-1 expression was significantly correlated in MS with a significantly higher MMP-9/TIMP-1 ratio in active MS than in healthy controls. These results are in support of an important pathogenic role of MMP-9 activity in MS.

Adult↗
PubMed1999

Elevated endogenous cannabinoids in schizophrenia.

Evidence suggests that cannabinoid receptors, the pharmacologcial target of cannabis-derived drugs, and their accompanying system of endogenous activators may be dysfunctional in schizophrenia. To test this hypothesis, we examined whether endogenous cannabinoid concentrations in cerebrospinal fluid of schizophrenic patients are altered compared to nonschizophrenic controls. Endogenous cannabinoids were purified from cerebrospinal fluid of 10 patients with schizophrenia and 11 non-schizophrenic controls by high-performance liquid chromatography, and quantified by isotope dilution gas-chromatography/mass-spectrometry. Cerebrospinal concentrations of two endogenous cannabinoids (anandamide and palmitylethanolamide) were significantly higher in schizophrenic patients than non-schizophrenic controls (p < 0.05). By contrast, levels of 2-arachidonylglycerol, another endogenous cannabinoid lipid, were below detection in both groups. The findings did not seem attributable to gender, age or medication. Elevated anandamide and palmitylethanolamide levels in cerebrospinal fluid of schizophrenic patients may reflect an imbalance in endogenous cannabinoid signaling, which may contribute to the pathogenesis of schizophrenia.

Adult↗
PubMed1999

Human polymorphonuclear neutrophils express a B7-1-like molecule.

Polymorphonuclear neutrophils (PMN) are part of the innate immune system and are first-line effector cells in acute inflammatory responses. On activation PMNs secrete cytokines and oxygen metabolites that might be involved in the regulation of the acquired immune response. We show here that peripheral blood PMNs constitutively express a B7-1-like molecule as detected by immunostaining with several B7-1 antibodies. Reverse transcriptase-polymerase chain reaction using three sets of primers spanning different regions of B7-1 indicate dissimilarities at the mRNA level. B7-1 mRNA is expressed in bone marrow cells and lipopolysaccharide (LPS)-stimulated but not in unstimulated PMNs. The B7-1-like molecule is localized to the cytoplasmic granules and translocated to the cell surface after stimulation with LPS or interleukin-12 in some donors. Binding of CTLA4-Ig suggests that the B7-1-like molecule can interact with functional B7 ligand and might be important in the immunobiology of PMNs.

Antibodies, Monoclonal↗
PubMed1997

Positron emission tomography and magnetic resonance imaging for cerebral involvement in patients with systemic lupus erythematosus.

Central nervous system (CNS) involvement in systemic lupus erythematosus (SLE) remains difficult to diagnose, particularly since structural abnormalities may not be revealed by magnetic resonance imaging (MRI). Glucose utilisation was measured by positron emission tomography (PET) in 35 SLE patients to detect signs of CNS involvement. The patients were examined by a standardised neurological examination, a battery of tests to evaluate neuropsychological performance and MRI. Antineuronal antibodies were determined to investigate their putative role in CNS involvement in SLE. Twenty patients had distinct neurological (17) and/or psychiatric (3) symptoms. Ten patients had pronounced cognitive impairment. Neurological and cognitive deficits were thus found to be unrelated disorders in SLE. Global glucose utilisation of SLE patients did not differ significantly from that of normal controls, nor were differences found between SLE patients with or without neurological or cognitive abnormalities. On MRI of the brain, the number and size of white matter lesions correlated with the presence of neurological deficits but were unrelated to the severity of cognitive impairment. Within the normal range, lower global glucose utilisation tended towards lower values with increasing number and size of white matter lesions. Patients with lesions larger than 8 mm also showed distinctly increased IgG anticardiolipin antibody titres, whereas measuring antineuronal antibodies did not reveal any relation to the variables investigated. We conclude that the demonstration of CNS lesions by MRI can contribute confirmatory evidence for CNS involvement in SLE, but PET or the presence of antineuronal antibodies adds little if any information beyond that obtained by clinical examination, neuropsychological testing, and MRI.

Adult↗
PubMed1995

Immunological and clinical response to immunosuppressive treatment in paraneoplastic cerebellar degeneration.

OBJECTIVE: To report the clinical and immunological response to immunosuppressive treatment with cyclophosphamide in two patients with paraneoplastic cerebellar degeneration. DESIGN: Case reports. Clinical and immunological follow-up data available for 4 1/2 years in the first patient and for 2 years in the second patient. SETTING: A 1500-bed university hospital and a 1200-bed university teaching hospital. INTERVENTION: Cyclophosphamide intermittent treatment. MAIN OUTCOME MEASURE: Clinical disability. RESULTS: One of the patients, who was treated from an early stage, recovered completely. The other patient showed a partial clinical response. While the two patients were receiving a maintenance regimen with cyclophosphamide, the conditions of both patients remained stable for at least 2 years. In both patients, intrathecal antibody synthesis declined considerably. CONCLUSION: Early induction of immunosuppressive therapy with cyclophosphamide should be tried in treating patients with paraneoplastic cerebellar degeneration.

Cerebellar Diseases↗
PubMed1995

[61-year-old patient with rapidly progressive cerebellar symptoms].

The rare case of a paraneoplastic, cerebellar degeneration is reported. In addition to the valuable early diagnosis of tumor disease, this paraneoplastic occurrence can also lead to false diagnoses in regard to both the underlying disease and the staging of the tumor. In the cases of known tumor disease, the assumption of cerebral metastasis is also possible.

Autoantibodies↗
PubMed1994

Estimation of ifosfamide/cisplatinum-induced renal toxicity by urinary protein analysis.

Ifosfamide (IFO) chemotherapy has been reported to result in deToni-Debré-Fanconi syndrome in a minority of patients only, but evaluation of tubular transport capacities has identified a substantial number of patients as having subclinical tubular dysfunction. After completion of combination chemotherapy employing IFO (n = 37) or IFO plus cisplatinum (CPL) (n = 27), glomerular and tubular function was assessed in 64 patients by the urinary excretion of transferrin, IgG, albumin, alpha 1-microglobulin (A1M) and N-acetyl-beta-D-glucosaminidase. Sodium dodecyl sulphate polyacrylamide gel electrophoresis was performed in 21 patients. The determination of urinary marker proteins was compared with the glomerular filtration rate, the fractional phosphate and percent amino acid reabsorption. A reduced glomerular filtration rate was observed in 9.8% of patients. Tubular dysfunction was frequent, with a predominance of renal amino acid (57%) and A1M (48%) loss. IFO-mediated renal toxicity was dose dependent. CPL treatment resulted in significant enhancement of tubular toxicity induced by IFO, whereas concomitant gentamicin therapy did not affect tubular function. Measurement of urinary protein cannot replace other tests for tubular dysfunction in IFO-treated patients, because the spectrum of IFO-induced nephrotoxicity includes dysfunction of different and independent transport mechanisms of the proximal tubular system. Increased urinary A1M excretion is an important indicator of impaired tubular protein reabsorption.

Adolescent↗
PubMed1994

Carbohydrate structures of beta-trace protein from human cerebrospinal fluid: evidence for "brain-type" N-glycosylation.

The carbohydrate structures of beta-trace protein from human cerebrospinal fluid have been elucidated. This protein carries exclusively N-linked oligosaccharides at two sites (Asn29 and Asn56). Enzymatically released N-glycans were studied by compositional and methylation analyses, high-pH anion-exchange chromatography, and liquid secondary ion mass spectrometry. All glycans were found to be of the complex type, and most (90%) of them were biantennary with no (40%), one (40%), or two (20%) N-acetylneuraminic acid residues. The rest were triantennary chains or biantennary chains with intact or truncated lactosamine repeats. The innermost N-acetylglucosamine residues of nearly all structures were found to be alpha 1,6-fucosylated. Peripheral fucose (about 20% alpha 1,3-linked to N-acetylglucosamine) was also detected. Seventy percent of the oligosaccharides contained a bisecting N-acetylglucosamine. Especially in the neutral, but also in the monosialylated oligosaccharide fractions, many incomplete antennae consisting of N-acetylglucosamine only were present. At least 20 different N-glycans were identified. Analysis of the site-specific glycosylation patterns at Asn29 and Asn56 revealed only minor differences. According to the structural features (a high degree of fucosylation, high amounts of bisecting N-acetylglucosamine, as well as terminal N-acetylglucosamine and galactose residues, and significant amounts of N-acetylneuraminic acid in alpha 2,3 linkage), this protein can be classified as "brain-type" glycosylated.

Acetylglucosamine↗
PubMed1994

Neurological examinations after liver transplantation concerning patients under corticosteroid immunosuppression and either FK 506 or cyclosporin.

To study the neurological sequelae in liver transplanted recipients, 25 patients were followed up between 5 and 30 months after transplantation and another 14 patients were seen before and after transplantation. Physical examination took special note of tremor and polyneuropathy; additionally, patients estimated concentration and memory, tremor, paraesthesias and sleep disturbances on a self-rating scale. Tremor was reported to be preexistent in 50% of the later FK 506 and cyclosporin group and only temporarily rose afterwards. Twenty-eight percent complained of tremor and 20% said that it interfered mildly with daily activity. Only 2 of 39 patients showed new signs of polyneuropathy. Concentration and memory improved significantly after transplantation. In the second group of patients, MRI, EEG, lumbar puncture and neuropsychological tests were done just before and routinely after transplantation, revealing numerous preexisting neurological deficits with only singular changes afterwards.

Adrenal Cortex Hormones↗
PubMed1993

Purification and chemical characterization of beta-trace protein from human cerebrospinal fluid: its identification as prostaglandin D synthase.

beta-Trace protein from pooled human CSF was purified to homogeneity. An apparent molecular mass of 23-29 kDa was determined for the polypeptide on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Amino-terminal sequencing of the polypeptide yielded the unique amino acid sequence APEAQVSVQPNFQQDKFLGRWFSA. Alignment of amino acid sequences obtained from tryptic peptides with the sequence previously deduced from a cDNA clone isolated by other investigators allowed the identification of beta-trace protein as prostaglandin D synthase [prostaglandin-H2 D-isomerase; (5Z, 13E)-(15S)-9 alpha, 11 alpha-epidioxy-15-hydroxyprosta-5,13-dienoate D-isomerase; EC 5.3.99.2]. A conservative amino acid exchange (Thr instead of Ser) was detected at amino acid position 154 of the beta-trace polypeptide chain in the corresponding tryptic peptide. The two N-glycosylation sites of the polypeptide were shown to be almost quantitatively occupied by carbohydrate. Carbohydrate compositional as well as methylation analysis indicated that Asn29 and Asn56 bear exclusively complex-type oligosaccharide structures (partially sialylated with alpha 2-3- and/or alpha 2-6-linked N-acetylneuraminic acid) that are almost quantitatively alpha 1-6 fucosylated at the proximal N-acetylglucosamine; approximately 70% of these molecules contain a bisecting N-acetylglucosamine. Agalacto structures as well as those with a peripheral fucose are also present.

Amino Acid Sequence↗
PubMed1992

Early onset MS under the age of 16: clinical and paraclinical features.

MS in juvenile patients under the age of 16 occurred in 31 (5%) of our whole MS population of 620 patients in the time from 1975-1991. It does not differ clinically from the disease as observed in 72 patients with later onset MS in respect to symptoms at onset, course, progression rate, rate of relapses and abnormalities in CSF and MRI. However, fever, headache, nausea and vomiting with pleocytosis in CSF during the first episode and development of oligoclonal bands with passage of time may be characteristic in some juvenile patients. The presence of oligoclonal bands and MRI results are of high diagnostic value in this special group of patients.

Adolescent↗