Biomedical subjects

K Westermark

Publications and source records attributed to K Westermark.

At least 19 recordsLinked to original sources

PubMed2003

Abdominal malignancies in patients with Wilson's disease.

BACKGROUND: Wilson's disease is associated with heavy copper overload, primarily in the liver. Copper is a toxic metal, and might be expected to be associated with cancer induction, as iron is in haemochromatosis. However, liver cancer is currently believed to be extremely rare in this disease, and other intra-abdominal malignancies have not been reported. AIM: To assess the frequency of abdominal malignant disease in patients with Wilson's disease on long-term follow-up. DESIGN: Retrospective study in two specialist Wilson's disease clinics: Cambridge/London and Uppsala. METHODS: We reviewed the case records of 363 patients seen at three centres: Addenbrooke's Hospital, Cambridge, 1955-1987; the Middlesex Hospital, London, 1987-2000; and the University Hospital, Uppsala, Sweden, 1966-2002. Patients were grouped by length of follow-up: 10-19 years; 20-29 years; 30-39 years; and 40 years or more. RESULTS: No cancers were seen in patients followed for <10 years. For patients in the 10-19 years group, the frequency was 4.2%; at 20-29 years, it was 5.3%; and at 30-39 years, 15%. No cancers were seen in the 40+ years follow-up group. The cancers consisted of hepatomas, cholangiocarcinomas, and poorly differentiated adenocarcinomas of undetermined primary site. DISCUSSION: Patients with Wilson's disease appear to be vulnerable to the formation of aggressive malignant intra-abdominal tumours during long-term follow-up, irrespective of treatment. Ultrasound scanning of the abdomen seems to be a useful screening procedure.

Abdominal Neoplasms↗

PubMed2001

Pattern of neuropsychological deficits in patients with treated Wilson's disease.

The study aimed to describe the neuropsychological profiles in patients with treated Wilson's disease (WD). The series included 19 symptomatic and 2 asymptomatic patients with a mean age of 35.3 +/- 9.2 years. They were tested with the Automated Psychological Test system (APT), a comprehensive computerised neuropsychological test battery. APT comprised eleven separate tests and assessed five essential types of neuropsychological functions: motor functions, basic neuropsychological functions, specific cognitive functions, memory, and executive functions. The results were compared to current norms of the test battery. The symptomatic WD patients had significantly lower performance than the norms on all finger tapping tasks, the simple reaction time, the simultaneous capacity background task, the short-term memory test, the index of word decoding speed, the grammatical reasoning test, and the perceptual maze test. They were significantly higher on the index of impulsive errors, and used a significantly more global processing mode in the test of selective attention. The female symptomatic patients displayed more pronounced neuropsychological deficits than the males in the complex tasks. WD patients displayed a specific profile of moderate neuropsychological impairment. The results are theoretically interesting and have practical implications for the management of WD patients, e.g. some patients confronted with the results have had increased compliance.

Adult↗

PubMed2001

Personality traits in treated Wilson's disease determined by means of the Karolinska Scales of Personality (KSP).

OBJECTIVE: The aim was to elucidate the personality traits of patients with treated Wilsons disease (WD) in comparison to healthy volunteers. METHOD: Twenty-five WD patients, ten females and 15 males, with a mean age of 35.2 +/- 8.3 years completed the Karolinska Scales of Personality (KSP), a self-report inventory comprising 15 separate scales. The results were compared to a control series comprising 200 men and 200 women drawn from the general population. RESULTS: The patients with treated WD scored significantly lower than the healthy controls on aggressivity-hostility-related scales and the scale measuring Psychic Anxiety. Patients with predominantly hepatic symptoms had the lowest aggressivity-related scores and patients with predominantly neurological symptoms had the lowest Irritability, Guilt and Detachment scores and the highest Impulsiveness and Muscular Tension scores. Both groups scored low on the Somatic Anxiety scale. CONCLUSION: The present results illustrate that patients with treated WD have significant deviations in personality traits, especially in aggressivity-hostility-related scales and Psychic Anxiety, compared to healthy controls when investigated by means of a self-report inventory, the KSP. The deviations were not related to age, age at onset or duration of the disease.

Adult↗

PubMed2000

Fibrosis in undifferentiated (anaplastic) thyroid carcinomas: evidence for a dual action of tumour cells in collagen type I synthesis.

The mechanisms involved in stromal reactions and fibrosis in solid malignant tumours are incompletely understood. In the present study, collagen type I production was investigated in tissues and cell lines derived from human undifferentiated (anaplastic) thyroid carcinomas, a highly aggressive, often fibrotic malignancy with mesenchymal phenotype. In situ hybridization showed the expression of pro-alpha1(I) collagen mRNA throughout the stromal part of the tumours. However, immunofluorescence staining using an anti-pro-collagen type I antibody revealed the synthesis of pro-collagen type I protein mainly in stromal cells juxtaposed to nests of tumour cells. In one out of five tissue samples from human undifferentiated thyroid carcinomas, pro-alpha1(I) collagen mRNA expression was also found in a small number of tumour cells. Several well-characterized cell lines established from undifferentiated thyroid carcinomas, two from tumours included in the present study, expressed both pro-alpha1(I) collagen and prolyl 4-hydroxylase mRNA, and three of these cell lines also synthesized native triple-helical collagen type I. Taken together, these data suggest that stromal fibroblasts are the main producers of collagen type I in anaplastic thyroid tumours. The carcinoma cells seem to play a regulatory role, stimulating the synthesis of collagen type I protein in the surrounding stroma by increasing pro-alpha1(I) collagen mRNA translation. However, collagen type I production by the carcinoma cells might also contribute to the marked desmoplasia commonly seen in these tumours.

Blotting, Northern↗

PubMed2000

Psychopathology in treated Wilson's disease determined by means of CPRS expert and self-ratings.

OBJECTIVE: To examine the occurrence and severity of psychopathological symptoms in patients with treated Wilson's disease (WD) and to evaluate the clinical utility of a self-assessment. METHOD: Twenty-six consecutive patients with confirmed WD were investigated using the Comprehensive Psychopathological Rating Scale (CPRS) and the CPRS Self-rating Scale. RESULTS: The total CPRS scores ranged from 2.5 to 59.0 (mean 29.4 +/- 15.5). Most common symptoms were: autonomic disturbances, observed muscular tension, fatiguability, reduced sexual interest, lack of appropriate emotion, concentration difficulties, reduced sleep, aches and pains, hostile feelings, apparent sadness and failing memory. Agreement between interview-based ratings and self-ratings was low. CONCLUSION: The patients with treated WD have prominent psychopathology in the same range as in patients with moderate to severe depressive disorders. A specific symptom profile has been identified. If confirmed, the identification of the typical symptom profile might be of great importance. The patients with WD tend to underestimate the presence of psychopathological symptoms.

Adult↗

PubMed2000

Determination of the frequencies of ten allelic variants of the Wilson disease gene (ATP7B), in pooled DNA samples.

Wilson disease is an autosomal recessive disorder characterised by toxic accumulation of copper in liver, brain and other organs. The disorder is caused by mutations in the ATP7B gene, encoding a copper transporting P-type ATPase. Based on the number of known patients with this diagnosis in Sweden, the prevalence can be estimated to 1 in 250,000 to 300,000, whereas the prevalence of Wilson disease has been estimated to be 1 in 30,000 in other populations. We estimated the prevalence of Wilson disease by determining the Swedish population frequencies of two mutant alleles, making up approximately half the mutations in Swedish Wilson patients, in a large number of DNA samples. In addition we determined the allele frequencies of eight common single-nucleotide polymorphisms (SNPs) in the ATP7B gene. For the analyses we devised two strategies for analysing pooled DNA samples using the quantitative minisequencing method. The two procedures allowed sensitive identification of rare mutant alleles present as a mixture with an excess of the normal allele, as well as accurate estimation of the frequencies of the common SNPs in a large pooled DNA sample.

Adenosine Triphosphatases↗

PubMed1999

Analysis of mutations in exon 1 of the human thyrotropin receptor gene: high frequency of the D36H and P52T polymorphic variants.

The aim of the present study was to investigate the N-terminal part (the translated part of exon 1) of the human thyrotropin receptor (TSHR) for the presence of mutations. Patients with Graves' disease (n = 160) and healthy controls (blood donors; n = 140) were screened using single-stranded conformational polymorphism (SSCP) in combination with restriction enzyme digestion for the two previously known mutations in this part of the receptor, viz. D36H and P52T TSHR-variants. We did not find any novel mutation in this region. However, D36H and P52T variants were found both in the TSHR of Graves' patients and in the healthy controls. The overall frequency of the D36H-receptor variant was 5.0% (15/300) and of the P52T-receptor, 7.3% (22/300). There was no major difference in the frequency for either of the TSHR alleles between the 2 groups. Thus, these 2 polymorphic variants of the TSHR seem to occur in a relatively high frequency in the population.

Alleles↗

PubMed1998

Integrins in thyroid tissue: upregulation of alpha2beta1 in anaplastic thyroid carcinoma.

OBJECTIVE: To evaluate the integrin pattern in the normal thyroid gland and in different pathological disorders including malignant tumors, because the aggressiveness of several malignant tumors correlates with alterations in the expression of one or more integrins. DESIGN: We examined the expression of integrins and E-cadherin immunohistochemically in a large and well-defined sample of normal and pathological human thyroid tissue. METHODS: Cryosections of 58 thyroid tissue specimens from normal tissue, thyrotoxicosis, nodular goiter, oxyphilic adenoma, follicular adenoma, follicular carcinoma, papillary carcinoma and anaplastic carcinoma, and three lymph node metastases were investigated immunohistochemically using monoclonal antibodies specifically recognizing the integrin beta1-, beta4-, alpha1-, alpha2-, alpha3-, alpha5- and alpha6-subunits, or E-cadherin. RESULTS: All thyroid epithelial cells expressed integrin beta1- and alpha3-subunits. Immunostaining of the beta4-subunit and the alpha6-subunits was found only in tumors. The staining pattern in the three lymph node metastases from papillary carcinomas did not differ from that in their primaries. Anaplastic carcinomas demonstrated neoexpression of the integrin alpha2-subunit. E-cadherin was detected in all tissues except anaplastic carcinomas. CONCLUSIONS: Neoexpression of alpha6beta4 was seen in most malignant tumors, whereas alpha2 was exclusively found in anaplastic carcinomas. In the latter, a loss of E-cadherin expression was also seen. These changes in cell adhesion molecule expression strongly suggest an association with the acquisition of proliferative and invasive properties.

Cadherins↗

PubMed1997

Identification and analysis of mutations in the Wilson disease gene (ATP7B): population frequencies, genotype-phenotype correlation, and functional analyses.

Wilson disease (WD) is an autosomal recessive disorder characterized by toxic accumulation of copper in the liver and subsequently in the brain and other organs. On the basis of sequence homology to known genes, the WD gene (ATP7B) appears to be a copper-transporting P-type ATPase. A search for ATP7B mutations in WD patients from five population samples, including 109 North American patients, revealed 27 distinct mutations, 18 of which are novel. A composite of published findings shows missense mutations in all exons-except in exons 1-5, which encode the six copper-binding motifs, and in exon 21, which spans the carboxy-terminus and the poly(A) tail. Over one-half of all WD mutations occur only rarely in any population sample. A splice-site mutation in exon 12 accounts for 3% of the WD mutations in our sample and produces an in-frame, 39-bp insertion in mRNA of patients homozygous, but not heterozygous, for the mutation. The most common WD mutation (His1069Glu) was represented in approximately 38% of all the WD chromosomes from the North American, Russian, and Swedish samples. In several population cohorts, this mutation deviated from Hardy-Weinberg equilibrium, with an overrepresentation of homozygotes. We did not find a significant correlation between His1069Glu homozygosity and several clinical indices, including age of onset, clinical manifestation, ceruloplasmin activity, hepatic copper levels, and the presence of Kayser-Fleischer rings. Finally, lymphoblast cell lines from individuals homozygous for His1069Glu and 4 other mutations all demonstrated significantly decreased copper-stimulated ATPase activity.

Adenosine Triphosphatases↗

PubMed1996

Efficient detection of mutations in Wilson disease by manifold sequencing.

We have applied a solid support for parallel handling and direct loading of sequencing reactions--manifold sequencing--to analyze the coding sequence for the deficient copper transporting P-type ATPase in 24 families with Wilson disease. At least 100 different amplification reactions could be handled in parallel, with a minimal turnaround time of 12 h from isolated genomic DNA to identification of the mutations. Sixteen different mutations were found, accounting for 92% of the mutant genes. Ten of these mutations have not been previously described. Eleven were observed only in single families. Mutation His1069Gln, previously identified as the most prevalent mutation in Northern Europe, was found in one-third of the Northern European chromosomes in our material. Four patients were homozygous for this mutation, and three were homozygous for Thr977Met. The method allowed us to establish the diagnosis of Wilson disease in 24 h in a patient with acute hepatic failure.

Adenosine Triphosphatases↗

PubMed1996

EGF-receptors in human normal and pathological thyroid tissue.

Expression of the epidermal growth factor receptor (EGFR) was studied in cryosections from human thyroid tissues. Normal tissue (4 cases), nodular goitre (12), toxic goitre (9), adenoma (9), follicular carcinoma (1), papillary carcinoma (7) and poorly differentiated carcinoma (1) were used for immunohistochemistry. Northern blot analysis was performed in two nodular goitres, three adenomas, two papillary carcinomas, one follicular carcinoma and the adjacent normal tissue in five cases as well as in two cell lines from anaplastic carcinomas. Epidermal growth factor receptor immunoreactivity was detected in all tissues examined. The amount of EGFR mRNA did not differ between normal and abnormal tissues. However, the EGFR staining was weaker in normal thyroid tissue compared to the adjacent neoplastic areas suggesting an upregulation at the posttranslational level in the latter. A strong staining was also seen in hyperfunctioning thyroid glands. The EGFR location was mainly basal or basolateral in all thyroid tissues with normal histology and in toxic diffuse goitre. Pericellular and sometimes cytoplasmatic staining was seen in neoplastic tissues. In nodular goitre the staining was both basal, lateral and apical and varied in intensity. Our data suggest that a non-polarized location of EGFR probably indicates a loss of the normal epithelial cell polarity and could be interpreted as an early sign of dedifferentiation. Furthermore, a role for the EGFR is proposed, not only in the development of thyroid neoplasias but also in goitre formation.

Adenocarcinoma, Follicular↗

PubMed1995

Neurological Wilson's disease studied with magnetic resonance imaging and with positron emission tomography using dopaminergic markers.

Four patients with neurological Wilson's disease were investigated using magnetic resonance imaging (MRI) and positron emission tomography (PET). All patients had dystonia as their major clinical manifestation but also had dysarthria and at the presentation of the disease had choreoathetoid movements in at least one limb. A multitracer approach with PET was used to visualize various aspects of dopaminergic function; [11C]-(+)-nomifensine (NMF), [11C]raclopride (RAC) and [11C]-L-DOPA (one patient). Correlation analysis of RAC and NMF binding as well as putamen/caudate uptake ratios showed corresponding reductions. The patient investigated with [11C]-L-DOPA had a normal striatal uptake. Generally, structural changes as shown by MRI corresponded to reductions both in NMF and RAC binding. There was no evident correspondence between PET findings and the severity of clinical symptoms seen in the individual patient. In two patients with discrete neurological impairment at the time of investigation, PET showed serious presynaptic dopaminergic lesions in the putamen. Our data suggest that the striatal degeneration seen in Wilson's disease comprises a complex pathology involving both afferent and efferent projections. The discrete neurological impairment seen in some patients with gross striatal pathology might be due to concomitant lesions in functionally counteracting basal ganglia circuits.

Adult↗

PubMed1995

Transforming growth factor-beta promotes epidermal growth factor-induced thyroid cell migration and follicle neoformation in collagen gel separable from cell proliferation.

The regulation of growth and migration of thyroid follicular cells by epidermal growth factor (EGF) and transforming growth factor-beta (TGF-beta 1) were studied in primary cultures of porcine thyroid follicles embedded in collagen gel. Cultures were exposed to growth factors and [3H]thymidine (1 microCi/ml) for 3 days and then examined by light microscopic autoradiography. EGF at 1 ng/ml increased the [3H]thymidine labeling index from approximately 1% (control value) to 60% and stimulated fivefold the number of cells invading the collagen matrix. Intermediate responses were seen after treatment with 0.1 ng/ml of EGF. EGF-stimulated [3H]thymidine incorporation was reduced by TGF-beta 1 at concentrations above 0.1 ng/ml. In contrast, TGF-beta 1, which alone only had a minor stimulatory effect on cell motility, markedly promoted the migratory response to EGF (1 ng/ml). Thus, 0.1 ng/ml TGF-beta 1 doubled the fraction of migrating cells without changing the level of [3H]thymidine incorporation. Moreover, cell migration was still fourfold over control values in cultures exposed to 1.0 ng/ml EGF and 1.0 ng/ml TGF-beta 1, despite a strongly inhibited [3H]thymidine labeling. The number of microfollicles located peripherally to the mother follicles was increased synergistically by EGF and TGF-beta 1. The epithelium of mother follicles became grossly discontinuous in regions of intense cell migration induced by EGF and TGF-beta 1 in combination. In conclusion, TGF-beta 1 modulates the response of porcine thyrocytes to EGF in collagen gel cultures by promoting cell migration along with inhibition of [3H]thymidine incorporation. This suggests that EGF stimulates cell motility independent of the mitogenic signal. The persistent loss of epithelial integrity during enhanced cell migration indicates that mechanisms of intercellular adhesiveness are down-regulated by TGF-beta 1 and EGF in cooperation.

Animals↗

PubMed1995

Functional analysis of a variant of the thyrotropin receptor gene in a family with Graves' disease.

Nucleotide sequence analysis of PCR fragments corresponding to the TSH-receptor (TSHR) amplified from genomic DNA collected from the four members of a family, two of which had Graves' thyrotoxicosis, revealed a nucleotide substitution in the first position of codon 36 of the TSH-receptor gene in the two patients. The nucleotide substitution was from G to C, leading to a 36D-->36H change (D36H) in the predicted amino acid sequence of the receptor. The altered sequence was also found in DNA obtained from their mother, but not in DNA from their father. We stably expressed the two receptor variants in NIH 3T3 cells, by transfection of cDNA encoding the wildtype (WT) and D36H variants of the TSHR. Neither the binding of 125I-TSH nor the responsiveness to TSH measured as cAMP formation, appeared to be different in the TSHR-D36H compared to the TSHR-WT. Furthermore, the D36H-receptor also became desensitized when exposed to TSH as did the WT-receptor.

3T3 Cells↗

PubMed1995

Retrospective evaluation of subtotal and total thyroidectomy in Graves' disease with and without endocrine ophthalmopathy.

A retrospective analysis was performed in 173 consecutive patients with Graves' disease (GD) with the principal aim of evaluating the influences of subtotal (N = 157) and total (N = 19) thyroidectomy on postoperative recurrence rates, endocrine ophthalmopathy (EO) and thyrotropin receptor antibody (TSH-R-ab) titres. Postoperatively recurrent disease, identified by increased thyroid hormone levels, occurred in 32 patients (20%) who underwent subtotal resection. These recurrences were associated with over-representation of preoperative EO (p < 0.001) as well as high TSH-R-ab levels postoperatively (p < 0.05-0.01). Subtotal and total resections were followed by an aggravation of preoperative EO in nine (16%) and one (6%), and by a development of EO in two and none of the patients, respectively. Persistently elevated TSH-R-ab titers during thyrostatic therapy became close to normalized in seven (32%) and 15 (88%) of the patients undergoing subtotal or total thyroidectomies, respectively, which illustrates a thyroid tissue dependency of the autoantibody production. Among the total material of 173 patients, altogether 75 cases exhibited persistent or progressive EO and/or TSH-R-ab elevation after more than 1 year of preoperative thyrostatic treatment. In this group, recurrent GD or aggravated EO occurred in 23 (39%) of those operated with subtotal resection and in one (6%) of those undergoing total thyroidectomy (p < 0.05). The results thus indicate that EO, particularly at the time of surgery, and prevailing TSH-R-ab titers are associated with an increased risk of recurrent GD and suggest that patients exhibiting these characteristics should benefit from total rather than subtotal thyroidectomy.

Adult↗

PubMed1995

Long-term treatment of Wilson's disease with triethylene tetramine dihydrochloride (trientine).

Long-term treatment with triethylene tetramine dihydrochloride, (trientine, TETA) was evaluated in 19 patients with Wilson's disease (WD). Two were given the drug as first choice and 17 after treatment with penicillamine. The change was made because of side-effects, lack of improvement or worsening of neurological symptoms. All penicillamine-induced side-effects reverted. Thirteen patients still receive trientine, and the mean total observation time on this treatment is 8.5 years/patient. Seven of the 13 are free from symptoms related to WD, five have mild to moderate neurological symptoms, mainly dysarthria. One patient with neurological symptoms who received trientine from the start of treatment deteriorated rapidly and is now severely dystonic. The symptoms initially worsened and later improved in one patient. All other patients improved during trientine treatment. Three patients died: two from a multifocal cancer including the liver and one non-complier from a ruptured spleen. Two patients underwent liver transplantation for progressive liver failure: one non-complier and one with liver cirrhosis whose liver function deteriorated despite treatment; both are now free from symptoms. Unexpectedly, two patients developed a serious colitis, one with duodenitis as well, that improved after withdrawal of the drug. No other unfavourable effects of trientine were recorded.

Adolescent↗

PubMed1994

Total thyroidectomy in therapy-resistant Graves' disease.

BACKGROUND: Influences of total thyroidectomy have not been evaluated in patients with severe Graves' disease who might respond less satisfactorily to subtotal thyroid resection. METHODS: Thirty-three patients with Graves' disease underwent total thyroidectomy because of persistent endocrine ophthalmopathy (n = 28) or elevated thyrotrophin receptor antibody titers (n = 25) despite a mean of 2 years of thyrostatic therapy. Moreover, six and four patients had undergone radioiodine treatment and subtotal thyroid resection, respectively. Perioperative findings and complications have been investigated, as have influences on endocrine ophthalmopathy and thyrotrophin receptor antibody titers during a mean of 2.5 postoperative years. RESULTS: Total thyroidectomy substantiated mean thyroid weights of 17 gm, 2.3 hours of operating time, and total blood loss of 264 cc. Vocal cord paralysis and vitamin D-treated hypocalcemia occurred in two and three patients, respectively, and invariably persisted less than 6 months. Normalization of elevated thyrotrophin receptor antibody titers occurred in 86% of patients without radioiodine exposure, and stable or improved signs of endocrine ophthalmopathy were found in 96% of patients examined 6 or more months after the operation. CONCLUSIONS: Total thyroidectomy seems to be a surgically safe procedure in complicated Graves' disease and to provide normalization of therapy-resistant thyrotrophin receptor antibody titers. Because favorable influences might also encompass severe endocrine ophthalmopathy, prospective analysis on its efficiency is warranted.

Adult↗

PubMed1993

Magnetic resonance imaging of the brain in Wilson's disease.

Fifteen patients with Wilson's disease were examined, using spin-echo (SE) and gradient-echo (GE) sequences with 0.5 T and 1.5 T magnetic resonance (MR) imagers. They fell into three groups: groups 1 and 2 were examined retrospectively after 3-18 years of treatment, while group 3 was examined prospectively from the start of treatment, after recommencement of treatment, or inadequate treatment. MRI was sensitive to changes in the basal ganglia at sites typical of Wilson's disease and was useful for documenting the effects of treatment. It was found necessary to estimate the relaxation times T1 and T2, to better assess improvement or transient worsening of the disease in the prospective group. Residual cavitation and gliosis could be distinguished in the retrospective group using a subtraction technique.

Adult↗