Biomedical subjects

H Malla

Publications and source records attributed to H Malla.

11 recordsLinked to original sources

PubMed2002

The dynamics of morphological changes in the pyloric endocrine cells of rats with uremia.

Disturbances in renal homeostatic function lead to changes in endocrine cell secretory activity. The aim of this study was the histomorphological estimation of dependence of gastric APUD system cell morphology and function on the time after subtotal nephrectomy in Wistar rats. Fragments of gastric pylorus were collected 1. 2, 4, and 6 weeks after nephrectomy. Paraffin sections were stained with H+E and by silver impregnation. Immunohistochemical reactions with the use of specific antibodies against calcitonin gene-related peptide (CGRP), synaptophysin (SPh). somatostatin (ST), and neuron-specific enolase (NSE) were also performed. Immunoreactivity of the examined substances in the pyloric mucosa in the first week after nephrectomy was lower than in the control group. However, in the following time intervals, endocrine cells showed stronger immunostaining in comparison with the control rats. The results suggest that chronic renal failure can modulate secretory activity of APUD system cells.

Animals↗

PubMed2002

Thyroid C cells in male and female rats with chronic renal failure.

The kidneys are responsible for iodine and of thyroid hormone biodegradation. The aim of this study was the histomorphological and immunohistochemical evaluation of the influence of sex on parafollicular thyroid C cells in rats with chronic renal failure. The experiment included 40 Wistar rats after subtotal nephrectomy, after sham operation, and without any surgical procedure. Two weeks after nephrectomy, fragments of thyroids were collected from the examined animals. Paraffin sections were stained with H+E and by silver impregnation. Calcitonin (CT), synaptophysin (SPh), somatostatin (ST), and neuron-specific enolase (NSE) were detected immunohistochemically in C cells. In rats with experimental uremia, immunostaining for the examined substances increased significantly in comparison to the controls. We also observed higher number of C cells with a stronger reaction in the group of males, compared to the female rats.

Animals↗

PubMed2001

Preliminary immunohistochemical investigations of human thyroid C cells in the simple and hyperactive nodular goitre.

The aim of this study was to carry out histomorphological and immunohistochemical analysis of thyroid C cells in 30 patients with simple goitre and hyperactive goitre including Graves-Basedow (G-B) disease, treated surgically. Four tissue samples were always taken from the same internal parts of the gland where the number of C cells in physiological conditions was the highest. C cells were detected in paraffin sections after impregnation with silver salt (Grimelius method) or immunohistochemically, with antibodies against calcitonin, synaptophysin, chromogranin A and neuron-specific enolase. Distinctly less numerous C cells were found in simple and hyperactive goitre than in normal thyroid parenchyma. The majority of C cells showed weak intensity of the examined immunohistochemical reactions. C cells were not observed at all in the texture of nodules well separated by the connective tissue. Proliferative changes concerned only follicular cells.

Adult↗

PubMed2001

Preliminary evaluation of endocrine cells in the rat respiratory tract after thyroid and parathyroid gland removal.

The complete thyroid and parathyroid gland removal leads to the abrupt reduction of calcitonin, which can be a factor stimulating growth and intensified activity of APUD system cells in the respiratory tract. Thus, neuroendocrine cells in the lungs and trachea in rats after thyroid and parathyroid removal were evaluated. Paraffin specimens of the examined organs were stained with H+E and impregnated with silver. Calcitonin, synaptophysin, somatostatin, and neuronal-specific enolase were detected immunohistochemically by the use of rabbit specific antibodies. Antibodies used in the study immunostained neuroendocrine cells of the examined organs. Rats with removed thyroid and parathyroid glands presented weakened reaction compared to the control group.

APUD Cells↗

PubMed2001

Preliminary evaluation of thyroid C cells in rats with chronic renal failure.

Numerous water-electrolyte and hormonal disturbances, including secondary hyperparathyroidism, occur in the course of chronic renal failure. It is assumed that chronic renal failure should affect the activity of C cells in the thyroid gland. Thus, the aim of the study was to evaluate immunohistochemically thyroid C cells in rats with experimental uremia. 30 days after nephrectomy, thyroid fragments were collected from experimental rats. Paraffin embedded sections were stained with H+E and by silver impregnation. Calcitonin (CT), synaptophysin (SY), somatostatin (ST), and neuron-specific enolase (NSE) were detected immunohistochemically in the C cells. A very distinct increase in C cell number in the thyroid and the weakening of majority of examined reactions were observed in rats with experimental uremia.

Animals↗

PubMed2001

Preliminary evaluation of neuroendocrine cells in the respiratory tract in rats with experimental uremia.

The goal of this study was to investigate the influence of experimetally induced chronic renal failure on endocrine cells in the respiratory tract in rats. After 30 days of uremia, the fragments of rat lungs were collected. Paraffin sections were stained using H+E, silver impregnation and immunohistochemistry with specific antibodies against calcitonin (CT), synaptophysin (SY), somatostatin (ST), and neuron-specific enolase (NSE). A large number of endocrine cells with a strong calcitonin immunoreactivity were observed in the respiratory tract of rats with experimental uremia, as compared with the control group. Other immunoreactions were weakened.

APUD Cells↗

PubMed2001

Preliminary evaluation of gastric endocrine cells in rats with experimental uremia.

Chronic renal failure can be the cause of various disturbances in hormonal and electrolyte metabolism, including calcium and phosphate metabolism. The aim of this study was the evaluation of pyloric endocrine cells in Wistar rats with experimental uremia. Fragments of gastric pylorus were collected 30 days after nephrectomy. Paraffin embedded sections were stained with H+E and by silver impregnation. We also performed immunohistochemical reactions with the use of specific antibodies against calcitonin gene-related peptide (CGRP), synaptophysin (SY), somatostatin (ST), and neuronal specific enolase (NSE). The rats with experimental uremia showed an increase in the number of endocrine cells and in intensity of all the examined reactions.

APUD Cells↗

PubMed2001

[Malignant or benign thyroid nodules: a diagnostic dilemma].

The aim of this study was to determine the incidence of cysts and cystoid-solid lesions in thyroid carcinomas basing on preoperative ultrasonographic examinations (USG), fine needle aspiration biopsy (FNAB) and postoperative histopathological examinations. 661 patients with different thyroid disorders were treated surgically. Carcinoma was found in 46 patients (3.9%). Papillary carcinoma was predominant (n = 34). Of the 46 patients with carcinoma, preoperative USG examination revealed cystic or cystoid-solid lesions in 18 patients (39%). FNAB of this 18 patients was positive in 5 cases, negative in 4 and suspect in 9. In 6 cases the neoplastic lesion was strictly connected with cysts (foci in the wall or in solid masses within the cyst) and in the remaining 12 patients lesions were found in the vicinity of the neoplastic focus. We conclude that malignant neoplasms of the thyroid gland are frequently (in approximately 40%) accompanied by cystic and cystoid-solid lesions, FNAB diagnostic material should be obtained even through several USG-controlled punctures and negative FNAB does not exclude thyroid carcinoma, particularly in nodular-cystoid goitre.

Adolescent↗

PubMed2001

Immunoreactivity of neuroendocrine cells in the respiratory tract in rats with experimental uremia after thyroparathyroidectomy.

Animals with experimental uremia, which underwent thyroparathyroidectomy, reveal numerous metabolic disorders that can influence morphology and activity of endocrine cells of the scattered neuroendocrine system. The aim of the study was the evaluation of the influence of thyroparathyroidectomy in rats with chronic renal failure on APUD system cells localized in the respiratory tract. The examination was conducted on the group of 20 rats. Thyroparathyroidectomy was performed 30 days after nephrectomy. Fragments of the lungs and trachea were collected 14 days after the operation. Routinely prepared paraffin sections were stained with H+E and with silver method. The immunohistochemical reactions were conducted with the use of antibodies against calcitonin (CT), synaptophysin (SPh), somatostatine (ST), and neuron-specific enolase (NSE) The results were estimated in light microscope on the basis of stain reaction of endocrine cells. Our examination showed that chronic renal failure affects the functioning of endocrine cells. We also observed the increase in APUD system cell number in the trachea and the lungs after thyroparathyroidectomy in uremic rats.

Animals↗

PubMed2001

Gastric endocrine cells in rats with uremia and after thyroparathyroidectomy.

The decrease in active kidney parenchyma amount causes disorders in hormone secretion processes and their inactivation failure. Experimental thyroparathyroidectomy is connected with an abrupt reduction in endocrine cells and hormones produced by them, which can be a stimulating factor as far as the increase and intensity of endocrine gastric cells activity is concerned. The aim of the study was the histomorphological and immunohistochemical evaluation of these cells in the gastric pylorus. Thyroparathyroidectomy was performed in rats 30 days after nephrectomy. Fragments of gastric pylorus were collected 14 days after the operation. Paraffin sections were stained with H+E and silver method. Immunohistochemical reactions were conducted using antibodies against calcitonin gene-related peptide (CGRP), somatostatin (ST), synaptophysin (SPh), neuron-specific enolase (NSE), and chromogranin (CgA). The results showed an increase in number of endocrine cells in stomachs of rats in experimental group as compared to controls. Endocrine cells were larger and contained more secretory granules.

APUD Cells↗

PubMed2000

[Primary hyperparathyroidism treated surgically].

Primary hyperparathyroidism is a systemic disease, more and more frequently recognized-concerning 1 to 3% of the population. Statistically appears in 1 of 1000 adults, with significant advantage of women. In Poland every year about 30 new cases are noticed and incidence increases with an age. In spite of significant advance of the knowledge, it still makes a lot of diagnostic troubles. It appears to be non-specific illness, characterised by just one symptom, mainly urolithiasis, sometimes chronic ulcer disease, chronic pancreatitis, arterial hypertension, disorders of the movement or psychic disorders. Parathyroid adenoma which is the main reason of the disease is usually single and small, multiple and bigger ones are found exceptionally. In about 2% of cases they are localized in mediastinum. In the article the basic symptoms, diagnostic and therapeutic problems were shown, especially concerning surgical treatment which is safe, radical and efficacious method when performed by experienced surgical team and the conduct from choice on primary and secondary hyperparathyroidism.

Adult↗