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At least 1,099 records · Page 61Linked to original sources
PubMed1975

Purification, characterization and radioimmunoassay of thyrocalcitonin from rat thyroid glands.

A highly purified preparation of rat thyrocalcitonin (TCT) has been obtained from lyophilized thyroid glands by gel chromatography following acid-acetone extraction. Biological activity of Sephadex G-50 eluates appeared in two peaks. The TCT in the major peak was concentrated, and applied to a Bio-Gel P-6 column, and a major protein peak was eluted which coincided with TCT activity. Potency, estimated by bioassay in rats, increase approximately 3500-fold from 0.075 MRC U/mg lyophilized glands to 250-400 MRC U/mg in the final product. The overall yield of TCT activity was about 36%. The purified product was characterized by chemical procedures and evaluated for its antigenic properties and use for radioimmunoassay. The purified rat TCT was used both labeled with 125I and as unlabeled standard. The following results were obtained: 1) Guinea pig antisera to either human or rat TCT were capable of binding 125I-rat TCT or 125I-human TCT; 2) Using either 125I-human or 125I-rat TCT and antisera to either TCT, pg amounts of rat and human TCT reacted in the assay while ng to mug amounts of salmon calcitonin or porcine TCT failed to react; 3) Using 125I-rat TCT and antisera to human or rat TCT, synthetic C-terminal (10-32 or 22-32) fragments of human TCT reacted well, while N-terminal (1-18) or desamide (1-32) derivatives reacted poorly or not at all; 4) Rat TCT was easily detected in normal thyroid venous plasma (5-10 ng/ml) and thyroid gland extracts (similar to 1 mug/gland) but not in peripheral blood; 5) Bioassay and radioimmunoassay of rat thyroid extracts (N equals 18) showed good agreement (r equals 0.86, p less than 0.001). The results support the idea that rat TCT is closely related to human TCT, indicate that major antigenic determinants reside in the C-terminal portion of the molecule, and show that antisera to either human or rat TCT can be used to measure rat TCT.

Amino Acids↗
PubMed1996

Histological studies of atrazine toxicity on the thyroid gland in rats.

Little is known about the toxic activity of the atrazine (a herbicide, commonly used in agricultural production) on the thyroid gland. In this study the compound was administered orally in female albino rats at sublethal exposure equivalent to 0.2 LD50 doses for 6 and 12 days. At termination of dosing the anesthetized animals were killed and blood was drawn for the determination of serum triiodothyronine (T3) and thyroxin (T4). A dose-dependent decrease of serum T3 concentration was observed in all the groups (control: 0.57 nmol-L-1; 6 days: 0.35 nmol-L-1; 12 days: 0.21 nmol-L-1). The thyroid gland was examined light-microscopically. Bouin's solution-fixed thyroids were embedded in paraffin and sections cut at 6 microns, stained separately with toluidine blue according to Slinchenko's method. Histologically in experimental groups epithelium featured small cuboidal cells and occasional structures of the follicles confluence within epitheliomers. A dose-dependent changes of the following parameters were observed: (a) increasing of number of follicle-building thyroid cells; (b) increasing of follicular volume; (c) decreasing of nucleus volume. Investigation of the whole population of thyroid mast cells disclosed no change in degranulation intensity. By contrast, degranulation intensity was decreased in perifollicular mast cells from groups treated with atrazine in dose-dependent manner. There are no changes observed in degranulation of stromal mast cells. These results suggesting that differences in response to the atrazine might account for an aspect of the functional heterogeneity within the rat thyroid mast cell population.

Animals↗
PubMed2006

[About correlation of dysfunction of the thyroid gland with fibrocystic diseases in women].

The reference data contain a lot of information on the interrelation between destroying of a thyroid gland and fibrocystic diseases. However contradictions in these data proves that this issue is not solved completely. The aim of the given study was the investigation of interrelations between frequency of occurrence of pathology of a functional condition of the thyroid gland and the frequency of occurrence of fibrocystic diseases. 90 women aged 23-50 were investigated. Concentration of thyroxin (FT4), thyrotrophic hormone (TSH), titers of antibodies to thyreoperoxidase, microsomal fraction of thyreocytes and thyreoglobulin were measured by ELISA. Palpation and ultrasonic investigations of thyroid and mammary glands were used, morphology of central formations of mammary glands according to indications was also carried out. A special questionnaire was completed for each patient. Our investigations showed that along with the declining of function of thyroid gland and the increased level of TSH in the blood, the risk of development of fibrocystic diseases is increased twice.

Adult↗
PubMed1989

Coexpression of cytokeratins and vimentin in normal and diseased thyroid glands. Lack of diagnostic utility of vimentin immunostaining.

We documented the coexpression of cytokeratins and vimentin in epithelial cells of the thyroid gland in 100 samples examined from 65 patients. These included normal, inflammatory, and neoplastic tissues that were routinely fixed in formalin and embedded in paraffin. The number of epithelial cells coexpressing the two intermediate filament proteins as well as the subcellular compartmentalization of vimentin immunoreactivity did not correlate with the various conditions of the thyroid gland. Therefore, we conclude that the immunolocalization of vimentin does not represent a useful adjunct tool for the histopathological diagnosis of thyroid diseases.

Humans↗
PubMed1979

Angioarchitecture of the canine thyroid gland.

The extrinsic vasculature of the canine thyroid gland was compared to that of the human and it was considered possible that the dog does not possess a caudal thyroid artery, as often described in the literature. The thyroid capsule was relatively thin in the dog and its trabeculae appeared histologically to be continuous with the tunica adventitia of the blood vessels. The intrinsic vascular pattern simulated the lobular structure and the blood vessels were named according to their relationship, course, and major area of supply inside the gland. The veins and lymphatics were satellite to the arteries and were designated homonymously. The lymph capillaries were more closely associated to the follicular epithelium than were the blood capillaries.

Animals↗
PubMed1996

Thyroid gland ectopias.

Failures of descent of the medial anlage of the thyroid and incomplete obliteration of its vertical tract lead to midline or near-midline ectopias such as lingual thyroid and thyroglossal cysts. Each poses special diagnostic and therapeutic considerations. "Ectopias" of the thyroid gland lateral to the carotid artery and jugular vein, however, cannot be readily explained by current embryological information. In these instances, and especially for intranodal thyroid tissue, a metastasis from an occult thyroid primary is the mandatory first consideration.

Carcinoma, Papillary↗
PubMedDate not supplied

Computed tomographic densitometry of normal feline thyroid glands.

We studied the computed tomographic (CT) appearance and determined Hounsfield units (HU) for normal thyroid tissue in eight cats. Helical CT images (2 mm collimation) were acquired from cranial aspect of the second cervical vertebra (C2) through caudal aspect of the fourth cervical vertebra (C4). Data were acquired before contrast medium administration (n = 7), after delayed contrast medium enhancement (n = 8), and immediately after contrast medium enhancement after a second dose of contrast medium (n = 8). Attenuation of thyroid tissue was compared with surrounding tissues. Before contrast medium enhancement, thyroid tissue was hyperattenuating to the surrounding soft tissues. After delayed contrast medium enhancement, thyroid tissue was hyperattenuating to surrounding soft tissues and isoattenuating to contrast medium-laden blood vessels. Immediately after contrast medium enhancement, thyroid tissue was hyperattenuating to surrounding soft tissues and hypoattenuating to contrast medium-laden blood vessels. The thyroid glands were dorsolateral to the trachea, ovoid, and displayed homogenous contrast medium enhancement. Circular regions of interest were drawn on the right and left thyroid lobes. Densitometric data of thyroid tissue were as follows: precontrast medium enhancement, 123.2 HU (95% CI: 119.4-127.1 HU); delayed contrast medium enhancement, 132.1 HU (95% CI: 127.4-136.8 HU); immediate postcontrast medium enhancement, 168.5 HU (95% CI: 163-173.9 HU). Normal feline thyroid tissue is easily detected using CT without contrast medium enhancement. This information may be useful for CT evaluation of abnormal feline thyroid glands.

Animals↗
PubMed2003

[Thyroid gland ultrasound screening (Papillon Initiative). Report of 15 incidentally detected thyroid cancers].

In the framework of the Thyroid initiative Papillon 2001 - 2002 thyroid nodules and sonographically detectable focal lesions with a diameter more than 5 mm were verified in 23.1% of 64.123 persons without a history of thyroid disease. The frequency of such findings was with 33.0% in 46-65 years old persons three times higher then in persons aged 18-30 years (9.6%). In the diagnostic workup thyroid cancer was detected in 15 patients operated on up to now (6 women and 9 men; papillary cancers in 12 cases, follicular cancers in 3 cases) The smallest tumor had a diameter of 1.3 cm, the mean diameter was 2.3 +/- 91 cm. In 3 patients the tumor had invaded the tissue beyond the thyroid capsule, in 4 cases multicentric growth was detected. Lymph node metastases were found in 7/15 cases and distant metastases in 2/15 cases. These result reveal, that thyroid cancer detected by chance may be relatively aggressive. In daily routine, sonographically detectable lesions with poor echogenicity, irregular margins or internal calcifications with a diameter of more than 1 cm should be clarified by fine needle aspiration biopsy.

Adolescent↗