Pathogenetic relevance of HLA class II expressing thyroid follicular cells in nontoxic Goiter and in Graves' disease.

HLA class II expressing thyroid follicular cells are found not only in classical thyroid autoimmune diseases, such as Graves' disease, but also in presumably nonautoimmune thyroid disorders such as nontoxic goiter. In this study the immunostimulatory function of the HLA class II expressing thyroid follicular cells derived from patients with nontoxic goiter and with Graves' disease was compared by assessing their capacity to stimulate allogeneic and autologous peripheral blood mononuclear cells, as well as cultured intrathyriodal T lymphocytes. Proliferation of allogeneic peripheral blood mononuclear cells was stimulated by thyroid follicular cells from both nontoxic goiter and Graves' disease thyroids, thus demonstrating that thyroid follicular cells from both disorders are capable of presenting alloantigens. In contrast the proliferation of autologous peripheral blood mononuclear cells was more efficiently stimulated by thyroid follicular cells from Graves' disease than from nontoxic goiter. Cultured intrathyroidal T lymphocytes proliferated specifically in response to autologous HLA class II+ thyroid follicular cells in Graves' disease, but not in nontoxic goiter. The responses were dose dependent and HLA class II restricted. Thyroid autoantigen presentation by HLA class II expressing thyroid follicular cells thus only occurs in Graves' disease, suggesting that HLA class II expression on thyroid follicular cells is an essential feature, but by itself not sufficient for the induction of autoimmunity. Additional factors, the possible nature of which is discussed must also be involved.

Transforming growth factor beta regulates thyroid growth. Role in the pathogenesis of nontoxic goiter.

The production and growth regulatory activity of transforming growth factor beta were studied in human thyroid tissue. As estimated by its mRNA expression in fresh tissue samples, transforming growth factor beta was produced in normal and in diseased thyroid glands. Transforming growth factor beta mRNA was mainly produced by thyroid follicular cells and in lesser quantities by thyroid infiltrating mononuclear cells. The concentrations of transforming growth factor beta mRNA were lower in iodine-deficient nontoxic goiter than in Graves' disease and normal thyroid tissue. Transforming growth factor beta protein secretion by cultured thyroid follicular cells was also low in nontoxic goiter, but could be increased by addition of sodium iodide (10 microM) to the culture medium. Recombinant transforming growth factor beta did not affect basal tritiated thymidine incorporation in cultured thyroid follicular cells, but inhibited, at a concentration of 10 ng/ml, the growth stimulatory influence of insulin-like growth factor I, epidermal growth factor, transforming growth factor alpha, TSH, and partly that of normal human serum on cultured thyroid follicular cells. This inhibition was greater in Graves' disease than in nontoxic goiter. These results suggest that transforming growth factor beta may act as an autocrine growth inhibitor on thyroid follicular cells. Decreased transforming growth factor beta production and decreased responsiveness to transforming growth factor beta may be cofactors in the pathogenesis of iodine-deficient nontoxic goiter.

Effect of thyroid hormones on plasma protein concentrations in man.

Plasma concentrations of proteins secreted by the liver (prealbumin, haptoglobin, transferrin, ceruloplasmin, alpha 1-antitrypsin, antithrombin III, and T4-binding globulin) and proteins mainly derived from endothelium [fibronectin, angiotensin-converting enzyme (ACE), and factor VIII-related antigen (F VIII R:Ag)] were measured in 27 hyperthyroid and 30 normal women. Significantly increased plasma concentrations (P less than 0.01) of endothelium-associated proteins, including fibronectin, ACE, and F VIII R:Ag, were found in hyperthyroid patients, while levels of proteins of primarily hepatic origin were normal. To determine whether the increase in endothelium-associated proteins in hyperthyroidism was directly related to elevated thyroid hormone levels, seven normal women were given T3 (25 micrograms, three times daily) for 2 weeks. These women had a consistent rise (P less than 0.05) in plasma concentrations of fibronectin, ACE, F VIII R:Ag, and tissue plasminogen activator. The rise in endothelium-associated proteins persisted for 10 days after cessation of T3. Plasma concentrations of hepatically synthesized proteins did not change. We conclude that thyroid hormone action either promotes endothelial protein synthesis or impairs its clearance.

Tumour necrosis factor synergises with gamma interferon on the induction of mRNA for DR alpha chain on thyrocytes from Graves' disease and non toxic goitre.

In both thyroid autoimmune diseases Graves' and Hashimoto's thyroiditis, the epithelial thyroid follicular cells (TFC) have been shown to express HLA class II molecules, and can restimulate autoreactive T cells cloned from the diseased tissue. This aberrant class II expression is important in the mechanism of perpetuation of the disease process, therefore we have compared the effect of interferon gamma (IFN gamma) and tumour necrosis factor (TNF alpha) on the HLA-DR alpha mRNA expression of thyroid follicular cells derived from Graves' disease (GD) and a non autoimmune disease, non toxic goitre (NTG). Our results indicate that TNF alpha synergises with IFN gamma in the induction of HLA class II mRNA. There was no consistent difference in DR alpha mRNA expression between the GD and NTG thyroid follicular cell preparations in response to induction by a combination of these lymphokines at various concentrations. Our data suggest that the differences in the level of expression of class II molecules observed in vivo in Graves' disease and non toxic goitre, which is much higher in the former, is probably due to local release of lymphokines by infiltrating T lymphocytes, although other factors may be involved.

Possible adverse effect of failed adjuvant chemotherapy on the prognosis of women receiving consecutive chemotherapy for recurrent breast cancer.

This study tried to evaluate the impact of adjuvant chemotherapy on the induction of chemoresistance in radically operated upon breast cancer patients. Remission rate, remission duration and survival of a group of women (n = 22) treated with combination chemotherapy (adriamycin and cyclophosphamide, AC) for recurrent breast cancer after failed adjuvant therapy (cyclophosphamide, methotrexate, fluorouracil, vinblastine) were retrospectively compared with the clinical data of non-pre-treated patients (n = 28) receiving the same regimen (AC). The two groups of patients were comparable with regard to their risk factors. In the group of women with prior adjuvant chemotherapy only 3 out of 22 had a partial response, lasting 3, 8, and 16 months; the median survival was 50 months. In the group without prior adjuvant therapy 3 complete and 7 partial remissions with a median remission duration of 15.5 months (range 2-54 months) were found; the median survival was 104 months. The percentage of objective responses among the non-pre-treated patients at 36% was almost significantly higher than that of the pretreated women with 14% (p less than 0.1). Responders to chemotherapy after relapse profited in terms of survival within the first 3 years after radical mastectomy, although no statistically significant difference was observed. The survival data shown assume a "shifting" of women from a group with better prognosis to a group with unfavourable prognosis following failed adjuvant chemotherapy.

Plasma fibronectin and thyroid function.

Plasma fibronectin concentrations up to 85 mg/100 ml were found in hyperthyroid patients. There was a significant correlation between free thyroxine index and plasma fibronectin values. Hypothyroid patients had low to normal fibronectin concentrations. Parallel decreases of thyroid hormones and plasma fibronectin concentrations were noted during treatment with thiamazole. A direct effect of thyroid hormones on fibronectin synthesis seems probable.

Low antithrombin III and high plasma fibronectin in pre-eclampsia.

Antithrombin III activity and plasma fibronectin levels were determined in patients with preeclampsia. In several cases low antithrombin III and high plasma fibronectin concentrations could be related to proteinuria. Altered plasma fibronectin and antithrombin III concentrations might contribute to a hypercoaguable state in patients with preeclampsia.

[Corticotropin releasing factor as an aid in the diagnosis of Cushing syndrome]. / Corticotropin Releasing Factor als Hilfsmittel in der Diagnostik des Cushing-Syndroms.

6 patients with Cushing's syndrome were investigated with regard to the effect of synthetic ovine corticotropin-releasing factor (o-CRF), administered as an intravenous bolus of 100 micrograms, on peripheral plasma concentrations of ACTH and cortisol. The purpose of this study was to evaluate the usefulness of this "CRF test" in the differential diagnosis of Cushing's syndrome as compared with conventional diagnostic procedures. 100 micrograms CRF caused a rise in plasma ACTH and cortisol in patients with bilateral adrenal hyperplasia (n = 3). However, in patients with cortisol-producing adrenal adenoma (n = 2) and ectopic ACTH overproduction (n = 1), no increase in plasma cortisol and ACTH was induced by exogenous CRF. We conclude from these findings that the CRF test will prove a valuable diagnostic tool to differentiate pituitary from extrapituitary forms of endogenous hypercortisolism in patients with Cushing's syndrome.

[Detection of primary aldosteronism using the captopril test]. / Erfassung des primären Aldosteronismus mittels Captopril-Test.

In order to evaluate whether changes in the plasma concentration of aldosterone (PA) following the administration of captopril, an inhibitor of angiotensin-converting enzyme, will establish the diagnosis of primary aldosteronism we have used this test in 9 healthy subjects and in 22 patients with various forms of hypertension, including 5 patients with primary aldosteronism due to idiopathic adrenal hyperplasia (n = 4) or aldosterone-producing adenoma (n = 1). The response of PA to captopril (25 mg orally) was investigated on an outpatient basis, following a rest period of 120 minutes in the supine position. In healthy subjects PA decreased from a mean basal value of 11.5 +/- 5.9 ng/dl to less than 6.4 ng/dl (4.9 +/- 1.4 ng/dl [p less than 0.01]). Similarly, captopril induced a fall in PA concentration to less than 6.4 ng/dl in patients with essential hypertension, with renal artery stenosis or with an afunctional kidney. Post-captopril concentrations of plasma aldosterone were about twice the normal level in 3 of 4 patients with idiopathic adrenal hyperplasia and about four-fold raised above normal in the patient with an aldosterone-producing adenoma. In spite of a false-negative result in one patient with idiopathic adrenal hyperplasia, the administration of captopril appears to be of use in recognizing patients with primary aldosteronism on an outpatient basis.

[Significance of laboratory chemical parameters for the detection of metastases in breast cancer]. / Bedeutung laborchemischer Parameter zur Erfassung von Metastasen beim Mammakarzinom.

The diagnostic value of 7 laboratory parameters for the detection of metastases was investigated in 136 patients with verified breast carcinoma after mastectomy. The post-operative interval was 6 to 80 months (means = 27.5). 61 patients had multiple metastases as determined by physical examination, X-rays, computertomography, sonographic and scan procedures, while the other 75 patients had no evidence of metastases. Carcinoembryonic antigen (CEA), alkaline phosphatase (AP) and lactate dehydrogenase (LDH) proved to be reliable parameters for the presence of metastases; the combination of these 3 parameters had a sensitivity of 73.0% and a specificity of 94.7% in the detection of metastases. The additional determination of gamma-glutamyltranspeptidase (gamma-GT), blood sedimentation rate (BSR), C-reactive protein (CRP) and serum iron (Fe) increased the sensitivity of metastases detection to 83.8%, but the specificity decreased to 46.2%.

[Magnetic resonance tomography as a localization method in hyperparathyroidism]. / Magnet-Resonanztomographie (MRT) als Lokalisationsmethode bei Hyperparathyreoidismus.

Magnetic Resonance Imaging (MRT) was performed in 36 consecutive patients with hyperparathyroidism. MR tomograms of 31 patients were evaluated and compared with the results of operation and histology (n = 29). In the remaining 5 patients MR examination was not completed, due to claustrophobia or motion artefacts. MR examinations were performed in 2 superconductive magnets (0.5 and 1.5 Tesla). A surface coil with following spinecho sequences was used: SE: TR/TE: 550-700/15-30; 2000/22-100. All patients were subjected to additional sonography. Out of 28 parathyroid adenomas 25 were identified on MR tomograms (sensitivity: 73%, specificity: 90%). However, only 2 out of 6 hyperplastic parathyroid glands were localized on MR tomograms. Lesions missed on MR tomograms measured 15 mm and less in diameter. It is characteristic that parathyroid adenomas showed isointense MR signal to the thyroid (SE 550/30 and hyperintense MR signal to fat (SE 2000/100). Different signal intensities of the adenomas were observed in 25% of the cases. MR imaging is a valuable diagnostic method for preoperative localisation of parathyroid adenomas. We think that MR imaging should be performed when sonography and subtraction scintigraphy are not able to identify a suspected adenoma in the same location.

24-hour serum concentration profile of cortisol in patients with Cushing's disease.

To evaluate whether or not patients with Cushing's disease can be differentiated from those with obesity by the determination of 24-hour integrated serum concentrations of cortisol we studied healthy, nonobese males (n = 5), as well as patients with marked obesity (n = 5) and with Cushing's disease (n = 7) in whom diagnosis was established biochemically and subsequently confirmed by surgery. Serum cortisol concentrations in samples collected continuously by a portable blood withdrawal pump during 24 hours (08:00-08:00h) were 6.6 +/- 1.7 micrograms/dl and 8.4 +/- 1.5 micrograms/dl in nonobese and obese individuals, respectively. Patients with Cushing's disease presented a mean cortisol concentration of 21.4 +/- 6.4 micrograms/dl (p vs normal: less than 0.005; vs obesity: less than 0.005). Collecting consecutive samples in 4-h periods the decline of serum cortisol from peak to nadir values was 73 +/- 10% and 57 +/- 23% in normal males and obese subjects, respectively, while a decline of only 22 +/- 8% was seen in patients with Cushing's disease. Three of the patients with Cushing's disease exhibited a circadian rhythm of cortisol albeit on an elevated level. These results may reflect variable stages of autonomy in pituitary ACTH-production and hence a possible criteria for differentation of hypothalamic and pituitary forms of Cushing's disease. In regard to differential diagnosis between Cushing's disease and obesity the 24-hour cortisol profile obtained by multiple sampling did not provide additional information to that obtained by a single sample pooled for 24 hours, which was diagnostic in each case.

Effect of prolonged administration of CRF on plasma concentrations of ACTH in patients with Addison's disease.

To investigate the possibility that the prolonged administration of corticotropin releasing factor (CRF) might suppress rather than enhance pituitary ACTH-secretion 24-hour infusions (50 micrograms/h) of ovine CRF were performed in 6 patients with adrenocortical insufficiency. CRF induced a heterogeneous behaviour of plasma ACTH concentrations in these hypercorticotropinemic patients but both a sustained increase and a suppression of ACTH was clearly absent at the end of the 24 hour infusion period. Thus, continuous administration of CRF does not appear to be a promising way to control abundance of plasma ACTH concentrations in patients with Addison's disease.

The circadian melatonin and cortisol secretion pattern in permanent night shift workers.

In permanent night shift workers the impact of environmental time cues on the circadian system is conflicting. Rhythm adjustments to the nocturnal work schedule have been described, and their significance for tolerance to shift work is under discussion. Reports concerning the effect of this work situation on the setting of the endogenous clock are, however, inconsistent. We examined nine healthy young male permanent shift workers with high work satisfaction at the end of a week on night work and seven male controls with normal diurnal working hours. All subjects were admitted to a research facility for 28 h, and blood was collected with a continuous-withdrawal pump in portions taken hourly for the estimation of the circadian melatonin (MT) and cortisol secretion pattern. One control did not exhibit a circadian secretion pattern. When compared with the other controls (n = 6), all except one of the shift workers showed no difference in the phase or phase relationship of their hormonal profiles. In the shift workers, a minor trend toward elevation of the MT amplitude and an increase in two indicators for the amount of MT secreted were noticed. One individual displayed inverse hormone rhythms with an undisturbed phase relationship of MT and cortisol and inconspicuous hormone amplitudes. He showed, however, an inverse day-night rhythm in his private life, too. The data collected suggest that even permanent night workers with a high degree of work satisfaction do not usually lose the diurnal orientation of their endogenous clock. Factors other than reorientation of the circadian system may be more important for high tolerance to shift work.

[Plasma fibronectin in normal pregnancy and EPH gestosis]. / Plasmafibronectin bei normaler Schwangerschaft und EPH-Gestose.

Plasma fibronectin was determined during normal pregnancy after 15th week, post partum, in cord blood and in cases of EPH gestosis. Non-pregnant women of a comparable age group were examined for plasma fibronectin concentration. Fibronectin at the end of gestation was at about the same level as at the beginning of the second trimester and as in non-pregnant women. The amount of fibronectin remains post partum practically the same. Cord blood fibronectin was about half the concentration of that in adult plasma. In EPH gestosis, levels were significantly elevated.

Endoscopic removal of choriocarcinoma metastasis in a patient with chronic intestinal hemorrhage.

A case of teratoma and choriocarcinoma of the testis with a single metastasis to the jejunum is described. The patient had suffered from severe intestinal hemorrhage for several weeks. An uneventful endoscopic removal of the metastasis was performed. The report illustrates that, particularly in young patients, metastatic lesion of the small bowel should be considered a possible cause of intestinal bleeding in patients who have neoplasm.

[Fibronectin and other immunologic parameters in chronic polyarthritis]. / Fibronectin und andere immunologische Parameter bei chronischer Polyarthritis.

In 20 patients with rheumatoid arthritis the plasma fibronectin concentrations were measured and correlated with the levels of C-reactive protein, alpha 1-antitrypsin, alpha 2-macroglobulin, fibrinogen, C3, C4 complement fractions and alpha 2-antiplasmin in serum respectively plasma. Patients with rheumatoid arthritis showed plasma fibronectin concentrations within reference levels. However, the concentrations of C-reactive protein, alpha 1-antitrypsin, alpha 2-antiplasmin, fibrinogen and C3-complement fraction were significantly higher in comparison to the healthy controls. The results indicate that fibronectin does not belong to the group of "acute phase proteins". Measurement of plasma fibronectin give no additional information about the activity of rheumatoid arthritis.

Acute oral poisoning with lindane-solvent mixtures.

Six cases of oral intoxication with lindane-solvent mixtures are reviewed. The ingested doses of lindane (mean dosage 120 mg/kg +/- 86 mg/kg) and benzene (mean dosage 366 mg/kg +/- 93 mg/kg) exceeded the toxic level. Symptoms (vomiting, dizziness and hyperreflexia) occurred within 30 min and all patients had epileptiform seizures. Two patients suffered from pulmonary edema and one of them had a severe rhabdomyolysis. Diazepam was sufficient to control convulsions in five cases. Gastric lavage was performed in five patients and activated charcoal, liquid paraffin with saline cathartic, and cholestyramine were used as adsorbents. Recovery was complete in all patients.

[Is routine bone scanning justified during the after-care for breast cancer?]. / Ist die routinemässige Skelettszintigraphie in der Nachsorge des Mammakarzinoms gerechtfertigt?

In a retrospective study of 254 women with carcinoma of the breast (mean age 55.4 years) the occurrence of bone pain was compared with results of skeletal scanning, skeletal X-ray examinations and routine biochemical findings. Typical signs of skeletal metastases were found in bone scans of 119 patients, 88 (74%) of whom had bone pain. Alkaline phosphatase was elevated in 54 (45%), LDH in 32 (27%), and gamma-GT in 69 patients (58%). There was a statistical correlation between the number of affected skeletal parts and the absolute level of alkaline phosphatase (P less than 0.001) and of LDH (P less than 0.05). Skeletal scans gave no evidence of bone metastases in 36 patients who had bone pains. In this group of patients alkaline phosphatase was elevated in 4, LDH in 1 and gamma-GT in 12 patients. Routine scanning of 254 patients revealed skeletal metastases in 12% without any clinical symptoms. Bone pain and (or) increased activity of alkaline phosphatase occurred in 91% of patients with skeletal metastases. In our view, bone scan in the postoperative control of breast cancer is justified only after onset of clinical symptoms and (or) if there is an abnormally raised alkaline phosphatase activity.

Haemophilus parainfluenzae endocarditis on tricuspid valve.

After an episode of intermittent fever which lasted 45 days, endocarditis of the tricuspid valve was diagnosed using M-mode echocardiography in a 17-year-old female patient who had no history of drug abuse. After unsuccessful therapy with ampicillin, tetracycline and aminoglycosides, clinical improvement was achieved by treatment with temocillin.