bluuebunny/crossref_metadata_2025_split huggingface dataset:
EFFECT OF PROLONGED ORAL ADMINISTRATION OF TRH ON PLASMA LEVELS OF THYROTROPHIN AND PROLACTIN IN NORMAL INDIVIDUALS AND IN PATIENTS WITH PRIMARY HYPOTHYROIDISM
Authors: Frey Harald M. M. , Haug Egil 
Published: December 2008

ABSTRACT
Forty mg TRH/day was given orally for 3 weeks to 10 euthyroid women and 10 women with primary hypothyroidism on low replacement doses of thyroxine. Once weekly oral TRH was replaced by an iv TRH-test (0.4 mg) with measurement of serum concentration of TSH, prolactin (PRL), thyroxine (T4), triiodothyronine (T3) and cholesterol.
In the normal group, mean serum T4 concentration increased after one week and remained elevated. Serum TSH concentration showed a slight tendency to decline. Maximal rise in TSH concentration after iv TRH (ΔTSH) fell from a mean of 4.0 ng/ml to 1.4 ng/ml within one week and stayed low. T3, cholesterol, PRL and ΔPRL were normal and unchanged throughout.
In the hypothyroid group T4, T3, cholesterol, PRL and ΔPRL were not influenced by the TRH administration. In 2 patients (with the highest serum T4 concentrations) serum TSH concentration was normal and resistant to iv TRH. Of the 8 patients with elevated TSH, basal level and ΔTSH did not change in 2 (with subnormal T4 levels and the highest TSH levels). In the other 6 (with intermediate T4 levels) basal TSH fell from a mean of 10.1 ng/ml to 4.2 ng/ml, and ΔTSH from 10.0 ng/ml to 3.3 ng/ml after three weeks.
It is concluded that in addition to feed-back effect of thyroid hormones, the pituitary response to long-term administration of TRH is determined by other factors. Among these may be reduced pituitary TRH receptor capacity and the activity of the TSH producing cells.
TOTAL AND "ACTIVATED" PERIPHERAL BLOOD T LYMPHOCYTES IN PATIENTS WITH THYROID DISORDERS
Authors: Wall J. R. , Gray B. , Greenwood D. M. 
Published: December 2008

ABSTRACT
The percentage of total and "activated" peripheral blood T lymphocytes was measured in patients with (i) hyperthyroid Graves' disease selected for absence of ophthalmopathy, (ii) treated Graves' disease, with ophthalmopathy, and (iii) other thyroid disorders including subacute thyroiditis, using sheep red blood cell rosette tests. No patient had significantly increased levels of either total or "activated" T lymphocytes. On the other hand, the percentage of total T cells was below normal in 8 of 18 patients with hyperthyroid Graves' disease and in 6 of 18 patients with ophthalmopathy compared with only one of 12 patients with nodular goitres. Similarly, low levels of "activated" T cells were demonstrated in 5 of 18 patients with hyperthyroid Graves' disease and in 10 of 18 patients with ophthalmopathy compared with only one of 12 patients with nodular goitres. Three of four patients with subacute thyroiditis tested had depressed levels of total T lymphocytes whilst only one had low levels of "activated" T lymphocytes. Levels returned to normal during the recovery phase in the two patients with positive tests who were retested. Depressed levels of T lymphocyte populations in patients with Graves' disease and subacute thyroiditis may be due to feedback suppression and/or "exhaustion" in association with the thyroidal and orbital immunological reactions.
DISTRIBUTION OF LATS ACTIVITY IN IMMUNOGLOBULIN G SUBCLASS
Authors: Ochi Yukio , Yoshimura Manabu , Hachiya Takashi , Miyazaki Tadayoshi 
Published: December 2008

ABSTRACT
The immunological character of LATS was examined by affinity chromatography on Anti-IgG, Anti-Fab, Anti-Fc and Staphylococcal Protein A bound Sepharose. By affinity chromatography on Anti-IgG, Anti-Fab and Anti-Fc bound Sepharose, it is possible to separate LATS-immunoglobulin from LATS positive serum without loss of activity.
Affinity chromatography on Protein A bound Sepharose is useful for obtaining further purified LATS-immunoglobulin. By this method, it is possible to separate IgG molecules of the subclasses IgG(1), IgG(2) and IgG (4) with high LATS activity. LATS activity was not found in the IgG(3) fraction.
When IgG(1) fraction was purified from the fraction containing the 3 subclasses of IgG(1), IgG(2) and IgG(4), about 85 % of total protein was found in IgG(1). However, specific activity per protein of LATS in IgG(1) fraction did not change remarkably.
After papain hydrolysis the thyroid stimulating activity of LATS-immunoglobulin was located in Fab fraction of these 3 subclasses of IgG(1), IgG(2) and IgG(4), and especially in IgG(1). The Fab fraction presents a short acting type of thyroid stimulating activity. These data indicate that LATS activity is mainly distributed in the Fab fragment of IgG(1).
RESPONSES OF SERUM GONADOTROPHINS TO LH-RELEASING HORMONE AND OESTROGENS IN JAPANESE WOMEN WITH POLYCYSTIC OVARIES
Authors: Aono Toshihiro , Miyazaki Masatoshi , Miyake Akira , Kinugasa Takayuki , Kurachi Keiichi , Matsumoto Keishi 
Published: December 2008

ABSTRACT
In order to define the abnormality in gonadotrophin secretion in Japanese women with polycystic ovaries (PCO) who rarely show virilization and markedly enlarged ovaries, basal levels of LH and FSH, and responses of serum gonadotrophins to LH-releasing hormone (LH-RH) or oestrogens were determined by radioimmunoassay. Eleven patients with PCO diagnosed by laparotomy or laparoscopy and 30 normal women in the follicular phase were studied.
The mean (± sd) basal level of LH was significantly higher in patients with PCO than in normal controls (PCO 28.6 ± 2.4 vs. normal 10.9 ± 3.0 mIU/ml), while the mean FSH level in PCO patients was not significantly different from that in the normal controls (9.7 ± 0.7 vs. 11.4 ± 2.6 mIU/ml). The mean LH/FSH ratio in PCO patients was significantly higher than that in normal controls (3.2 ± 0.9 vs. 1.0 ± 0.3). Exaggerated response of LH to LH-RH was observed in PCO patients, while the FSH response was comparable with the normal controls. Ten out of 11 patients with PCO showed LH release exceeding the basal level after bolus iv injection of 20 mg conjugated oestrogens (Premarin®), and virtually the same mean net increase in LH from the basal level was obtained in both PCO patients and normal controls.
Since the abnormalities in gonadotrophin secretion in Japanese women with PCO are not different from those reported in patients with PCO in Europe and USA, it seems likely that lower incidence of markedly enlarged ovaries and virilization in Japanese patients may be caused by the difference in ovarian response to gonadotrophin.
THE EFFECT OF LUTEINIZING HORMONE-RELEASING HORMONE IN HYPOGONADOTROPHIC EUNUCHOIDISM
Authors: Bremner William J. , Fernando Nihal N. , Paulsen C. Alvin 
Published: December 2008

ABSTRACT
Fourteen patients with hypogonadotrophic eunuchoidism (HE), 10 males and 4 females, received luteinizing hormone-releasing hormone (LH-RH) as 4-h intravenous infusions of 0.2 μg/min or as subcutaneous (sc) injections of 200 μg. Repeated LH-RH administration over 4 days (200 μg sc daily) was undertaken in 8 patients. Eight of the 10 males and all 4 of the females were found to have definite elevations of luteinizing hormone (LH) and follicle stimulating hormone (FSH) following their first exposure to exogenous LH-RH. The patients included 2 males and 1 female with variant forms of HE, all of whom showed responses of both gonadotrophins.
When the first exposure of HE patients to exogenous LH-RH was as a 4-h infusion, the biphasic pattern of LH increase characteristic of normal adults was not found. Instead, a monophasic and qualitatively small LH increase occurred, similar to that found in pre-pubertal children and in anorexia nervosa. In 2 patients with an initially abnormal LH response, a 4-h LH-RH infusion following 4 days of LH-RH injections (200 μg sc/day) produced a normal biphasic LH increase. These results imply that maintenance of the two pools of pituitary LH demonstrable in normal adults depends on adequate production of endogenous LH-RH.
Increases in FSH following the initial exposure to LH-RH were generally as great or greater than those of normal adults in spite of the fact that LH responses tended to be smaller than those of adults. Four days of LH-RH administration (200 sc daily) did not lead to consistent increases in gonadotrophin responsiveness. Increases of testosterone or oestradiol production could not be demonstrated, even with 4 to 5 days of LH-RH administration. Exogenous sex hormone therapy markedly inhibited gonadotrophin responsiveness to LH-RH.
THE EFFECT OF STRESSFUL DIAGNOSTIC STUDIES AND SURGERY ON ANTERIOR PITUITARY HORMONE RELEASE IN MAN
Authors: Sowers J. R. , Raj R. P. , Hershman J. M. , Carlson H. E. , McCallum R. W. 
Published: December 2008

ABSTRACT
The hormonal response of the anterior pituitary was studied in 10 normal males undergoing treadmill exercise testing, in 5 male patients undergoing diagnostic gastroscopy, and in 8 male patients undergoing elective surgery under general anaesthesia. Serum TSH was depressed below the baseline value at 2 and 3 h post-treadmill exercise, at 1, 2 and 3 h post-gastroscopy and from 10 min through 2 h post-surgery. Serum triiodothyronine was depressed below the baseline value at 10 min through 2 h post-surgery. Serum prolactin, growth hormone and cortisol were elevated by all three stressful procedures. Both gastroscopy and surgery resulted in an elevation of serum luteinizing hormone levels. There was no significant change in serum FSH levels in any of the three procedures. The post-stress depression in TSH levels could result from the suppressive effect at the hypothalamic-pituitary level of high serum levels of cortisol generated by the stress of the procedures.
STUDIES ON CIRCADIAN VARIATIONS OF PLASMA TSH, THYROXINE AND TRIIODOTHYRONINE IN MAN
Authors: Lucke C. , Hehrmann R. , von Mayersbach K. , von zur Mühlen A. 
Published: December 2008

ABSTRACT
To evaluate the existence of circadian variations in thyroid hormone and TSH levels, blood was drawn every 20 min for 24 h in four and for 14 h in one volunteer. Hormones were measured by sensitive radioimmunoassays.

TSH:
A diurnal rhythmicity could be demonstrated with peaks from 8 p. m. to 2 a. m. and a nadir from 7 a. m. to 2 p. m. Superimposed on the diurnal rhythm multiple shortlived fluctuations were observed.

Thyroxine:
Pooled data showed peak values from 8 a. m. to 12 a. m. and lowest levels from 11 p.m. to 3 a.m. Again, shortlived fluctuations were superimposed on the diurnal rhythm in all instances.

Triiodothyronine:
Hormone levels were highest from 7 a. m. to 1 p. m. and lowest from 11 p. m. to 3 a. m. Fluctuations in T3 levels were less marked than those of T4.
Diurnal variations in hormone levels can be demonstrated in most, but not in all instances. Fluctuations are minor and do not exceed the normal range. Therefore these changes are of no relevance in routine testing of these hormones.
EARLY EFFECTS OF THYROID STIMULATING HORMONE (TSH) ON EXOCYTOSIS AND ENDOCYTOSIS IN THE THYROID
Authors: Ericson Lars E. , Johansson Bengt R. 
Published: December 2008

ABSTRACT
The early effect (3 min) of thyroid stimulating hormone (TSH) on exocytosis-endocytosis in the rat thyroid follicle cell was investigated by electron microscopic morphometry. All rats used were pre-treated with thyroxine for 2 days prior to the experiments. In control rats, the membrane surface area of exocytotic vesicles, the only type of vesicle present in the apical part of the follicle cell, approximately equaled that of the apical plasma membrane. Intravenous administration of TSH caused a significant decrease in the membrane surface area of exocytotic vesicles by about 20 % and a corresponding, significant increase in the membrane surface area of the apical plasma membrane by about 20 %. Pseudopods were present in 4 of 6 TSH-injected rats examined, but the membrane surface area of these structures was only 15 % of the increase in the surface area of the apical plasma membrane. The total membrane surface area analyzed was not influenced by injection of TSH.
We conclude that the initial effect of TSH on the thyroid follicle cell is a re-distribution of membrane from exocytotic vesicles to the apical plasma membrane. This conclusion is in harmony with our previous observations which indicate that the (membrane-requiring) endocytotic response after TSH is regulated by the amount of membrane material added to the apical plasma membrane by exocytosis.
EVALUATION OF A THERAPEUTIC REGIMEN IN CUSHING'S DISEASE
Authors: Lamberts S. W. J. , de Jong F. H. , Birkenhäger J. C. 
Published: December 2008

ABSTRACT
Eighteen unselected patients with Cushing's disease were treated by unilateral adrenalectomy followed by conventional external pituitary irradiation (4500 rads). In 9 of these patients (50 %) a remission has been reached as judged by the clinical picture and the cortisol secretion rate (CSR) up to an average of 5 years after operation (follow-up varying between 1 and 7.5 years). The 9 other patients showed a relapse making necessary a second adrenalectomy after an average of 15 months (5 to 57 months). Four of these patients had a slightly enlarged (two cases) or asymmetrical sella turcica (two cases).
The gain of this therapeutic regimen was that no permanent adrenal insufficiency is induced in 50 % of the patients, that no pituitary tumours developed and that no loss of pituitary function occurred. Before treatment the group of 9 patients, who did not improve or relapsed after treatment, showed a greater rise of plasma cortisol in response to lysine vasopressin, a (greater) decrease of plasma cortisol in response to a single oral dose of 1 mg dexamethasone and an earlier decrease of the urinary 17-OGS in response to 2 mg dexamethasone four times daily orally. It is concluded that in the patients whose hypothalamo-pituitary-adrenal axis could be manipulated less this therapeutic regimen had a better result.
QUANTIFICATION OF ANDROGEN BINDING, ANDROGEN TISSUE LEVELS, AND SEX HORMONE-BINDING GLOBULIN IN PROSTATE, MUSCLE AND PLASMA OF PATIENTS WITH BENIGN PROSTATIC HYPERTROPHY
Authors: Krieg M. , Bartsch W. , Herzer S. , Becker H. , Voigt K. D. 
Published: December 2008

ABSTRACT
The in vitro binding of 5α-dihydrotestosterone (5α-DHT) in benign prostatic hypertrophy (BPH), rectus abdominis muscle and plasma of 14 patients was characterized and quantified by agargel electrophoresis. The respective endogenous tissue and plasma levels of 5α-DHT and testosterone (T) were determined by radioimmunoassay, and the plasmatic sex hormone-binding globulin (SHBG) concentration was estimated in the 14 patients by an (NH4)2SO4 precipitation technique. Finally the in vitro conversion of 5α-DHT to the 5α-androstanediols in the BPH at 0°C after a 20–24 h incubation period was analyzed by thin-layer chromatography.
The main results were as follows: (1) In 12 out of 14 BPH cytosols three charcoal resistant binding peaks were found, of which peak 1 represents SHBG, peak 2 the specific receptor protein and peak 3 a binding protein with relatively high binding capacity and low affinity for 5α-DHT. In two cases peak 2 was absent. In 11 out of 14 muscle cytosols three binding peaks are also present, resembling those of the BPH. (2) The receptor peak is reduced on average 38 % by unlabelled 5α-DHT, 23 % by cyproterone acetate (CYAC) and 29 % by oestradiol. The parallel data for the SHBG peak are: 62% by 5α-DHT, 22% by CYAC and 49% by oestradiol. (3) From displacement studies with unlabelled 5α-DHT the average concentration of receptor was calculated to be 12.3 fmol/mg cytosol protein (CP) in BPH, and 3.6 fmol/mg CP in muscle. Under identical conditions 39.9 fmol SHBG/mg CP and 24.1 fmol/mg CP were found in the BPH and muscle, respectively. The mean values are significantly different (P < 0.001). In plasma a mean value of 4.0 × 10−8 mol SHBG/1 was found. (4) In the BPH on average 4.43 ng 5α-DHT/g tissue and 0.23 ng T/g tissue are present, in muscle 0.45 ng 5α-DHT/g tissue and 0.71 ng T/g tissue, in plasma 0.47 ng 5α-DHT/ml and 3.89 ngT/ml. (5) Statistical calculations revealed (a) a significantly (P < 0.05) negative correlation between the endogenous 5α-DHT and T tissue levels and the available 5α-DHT receptor sites in BPH cytosol, (b) a positive correlation between plasmatic SHBG concentration and the available SHBG concentration in BPH cytosol. (6) Compared to the rat prostate, where 36 % of the incubated 5α-DHT was converted at 0°C within 20–24 h into the 5α-androstanediols, in the BPH conversion to 5α-androstanediols was negligible.
COMPARISON OF THE METABOLISM OF TESTOSTERONE UNDECANOATE AND TESTOSTERONE IN THE GASTROINTESTINAL WALL OF THE RAT IN VITRO AND IN VIVO
Authors: Geelen J. , Coert A. , Meijer R. , van der Vies J. 
Published: December 2008

ABSTRACT
The metabolism of testosterone undecanoate (TU) and testosterone (T) is studied in the gastrointestinal wall of the rat in vitro. A comparison is made with the in vivo metabolism of these compounds in the rat.
The major metabolite first appearing during incubation of TU with the small intestine is T. Incubation of TU or T with the small intestine reveals a great similarity between the metabolite patterns obtained. This is also the case with the patterns derived from portal vein plasma upon oral administration of TU and T. Incubation of different parts of the gastrointestinal tract with TU or T shows that the greatest metabolic activity is located in the wall of the small intestine. Unlike T, TU is metabolized only to a small extent in the wall of the stomach and the large intestine.
THE EFFECT OF OVARIAN STEROIDS ON HYPOTHALAMIC NOREPINEPHRINE NEURONAL ACTIVITY
Authors: Munaro Norma I. 
Published: December 2008

ABSTRACT
The concentration of norepinephrine and the apparent turnover of norepinephrine in the hypothalamus was studied in castrated rats and after the injection of ovarian steroids. Both parameters were found to vary not only with the hormone treatment, but also with the time of the day. Norepinephrine concentration in the anterior hypothalamus of castrated male and female rats was significantly higher in the afternoon than in the morning, but no statistical difference was observed in the concentration of norepinephrine in the posterior hypothalamus. Three days after the injection of a single dose of 20 μg oestradiol benzoate, norepinephrine concentration and apparent turnover were found with decreased significant values in the anterior hypothalamus of castrated females, killed in the afternoon. Progesterone 2 mg injected three days after the priming dose of oestradiol benzoate, produced 4 h later in the afternoon a significant rise in norepinephrine concentration and apparent turnover. These results suggest that the apparent turnover of hypothalamic norepinephrine in the afternoon is reduced by oestrogen and increased by oestrogen plus progesterone.
ANDROGEN RECEPTORS IN PROLACTIN PRODUCING PITUITARY TUMOURS IN RATS
Authors: Attramadal Arne , Naess Oddvar , Haug Egil , Hansson Vidar , Purvis Ken 
Published: December 2008

ABSTRACT
The androgen receptor system in prolactin secreting oestrogen induced pituitary tumours has been studied. The tumour cytosol was found to contain specific androgen receptors binding [3H]5α-dihydrotestosterone (DHT) and [3H] testosterone (T) with high affinity and low capacity. Scatchard analysis of the saturation data for T revealed one class of high affinity binding sites. The equilibrium constant of dissociation (Kd) was ∼ 4 × 10−10 m and the number of binding sites was calculated to be 12.8 femtomoles/mg protein. The sedimentation coefficient of the androgen receptor complex in low salt sucrose gradients was ∼ 7 S, the electrophoretic mobility (RF) in 3.25 % polyacrylamide gels ∼ 0.5 and the isoelectric point 5.8. The protein nature of the receptor was indicated by the finding that protease, but not DNase and RNase, eliminated androgen binding. Furthermore, the receptor was thermolabile and functionally dependent on free SH-groups since androgen binding was eliminated by heating 45°C for 30 min) and treatment with p-chloromercuriphenyl sulphonate (1 mm). Steroid specificity was tested in vitro by examining the competing efficiency of different unlabelled steroids for the binding of [3H]T. The affinity of DHT for the receptor was approximately twice that of testosterone while the binding affinity of oestradiol-17β and progesterone was very low. Cortisol had no affinity for the androgen receptor. The dissociation of the androgen receptor complex was very slow at 0°C (t ½ > 48 h). Thus, the characteristics of the cytoplasmic androgen receptors of the prolactin producing pituitary tumours are very similar to those of the androgen receptors earlier demonstrated in the anterior pituitary, hypothalamus, ventral prostate, epididymis and testis. The presence of specific androgen receptors in prolactin producing pituitary tumours indicates that androgen is involved in the regulation of synthesis and release of prolactin.
THYROID VASCULARITY - DOCUMENTATION OF THE IODIDE EFFECT IN THYROTOXICOSIS
Authors: Brownlie B. E. W. , Turner J. G. , Ellwood M. A. , Rogers T. G. H. , Armstrong D. I. 
Published: December 2008

ABSTRACT
Thyroid vascularity was measured in 101 thyrotoxic patients by analysis of 99mTc pertechnetate thyroid flow studies obtained with a gamma camera - minicomputer system. The diffusely hyperplastic goitres tended to have higher vascularity than the toxic multinodular goitres, and many of the solitary toxic nodules had vascularity results within normal limits. Potassium iodide therapy, 60 mg b. d. for 10–14 days results in a dramatic reduction in thyroid vascularity in diffuse thyroid hyperplasia and toxic multinodular goitre but the effect on toxic nodules was marginal.
INHIBITION BY SOMATOSTATIN OF MOUSE THYROID ACTIVITY FOLLOWING STIMULATION BY THYROTROPHIN, ISOPRENALINE AND DIBUTYRYL CYCLIC-AMP
Authors: Ahrén B. , Hedner P. , Melander A. , Westgren U. 
Published: December 2008

ABSTRACT
The recent discovery of somatostatin-containing cells within the thyroid gland infers that somatostatin may influence thyroid activity. This possibility was investigated by measurements of radio-iodine release in mice pre-treated with 125I and T4. The animals were treated with TSH, isoprenaline or dibutyryl-cyclic AMP with and without concomitant injection of somatostatin. It was found that somatostatin reduced the blood 125I increase in response to each of the three thyroid-stimulating agents. The elimination rates of 125I-labelled T4 and T3 were unaffected by somatostatin.
The observations suggests that somatostatin may participate in the regulation of thyroid hormone secretion, by an inhibitory effect exerted within the thyroid gland.
GLUCOCORTICOID EFFECTS ON VASCULAR CONNECTIVE TISSUE DURING REPAIR. IMPORTANCE OF DOSE LEVEL AND PRE- AND POST-INJURY TREATMENT
Authors: Mathorpe R. , Garbarsch C. , Kofod B. , Lorenzen I. 
Published: December 2008

ABSTRACT
Aorta of male albino rabbits were subjected to a single mechanical dilatation injury and the effects of different daily doses of prednisolone on the metabolism of collagen and glycosaminoglycans as well as on the content of alpha-amino nitrogen, RNA, DNA, water and fat and the histology of the descending thoracic aorta were analyzed 10 days after the injury. The effects of pre- and post-injury treatment with prednisolone were compared.
Prednisolone inhibited the intimal thickening. This effect was enhanced by pre-injury treatment.
Prednisolone also inhibited the biosynthesis of non-dialysable [14C]hydroxyproline-collagen, but increased the relative degradation of collagen in a dose dependent manner. The biosynthesis of glycosaminoglycans was decreased while prednisolone had no effect on the concentration and total amount of glycosaminoglycans, collagen, protein, RNA, DNA and fat. Finally the aortic content of water was decreased during treatment with prednisolone also in a dose dependent manner.
It is concluded that the action of prednisolone on vascular collagen and water during repair is dose dependent and that the inhibitory action of prednisolone on the intimal thickening is enhanced by pre-injury treatment.