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Biomedical subjects

I Ariel

Publications and source records attributed to I Ariel.

At least 73 records · Page 4Linked to original sources
PubMed1991

Infections, preterm delivery, and perinatal death in midgestation.

Amniotic fluid infection results in considerable pregnancy wastage in the second and early third trimesters. In our study of 1119 perinatal autopsies amniotic sac infection was associated with death in 133 fetuses and neonates in midgestation. These cases accounted for almost 12% of all perinatal autopsies and for 20% of all perinatal autopsies in midgestation at Women and Infants Hospital during the past decade. Gram-positive organisms, especially coagulase negative staphylococcus, group B streptococcus and Streptococcus viridans, were the most common pathogens isolated.

Adolescent↗
PubMed1990

Streaming pancreas: islet cell kinetics.

Thirty male young adult rats aged 7 weeks, weighing 200 g, were injected with 0.5 microCi/g body weight tritiated thymidine (specific activity 5.0 Ci/mM). The rats were then killed in groups of five, at the following times: 1 hour, and 14, 28, 42, 56, 90, and 120 days. The pancreata were dissected, embedded in paraffin, and cut into 5 microns thick sections which were then dipped into liquid emulsion. The labelling index of acini and islet cells was estimated in each autoradiogram, and their distance from intercalated duct was measured. Acini and islet cells streamed away from the intercalated duct at a daily velocity of 0.52 microns. Acinus labelling index which was initially 0.78% declined with time. Islet cell labelling index was initially 0.38%. In the following days it climbed upward reaching on the 42nd day its peak value of 0.78%. From then onward it declined to a low of 0.38%. Since cells were labelled only once, and labelling was instantaneous, it is concluded that labelled acinus cells entered the islet, and that acinus cells are actually islet cell precursors. The pancreas is structured kinetically like other exocrine glands, being a two compartment cell renewal system which continuously renews its cells. The pancreocyte is a descendant of an intercalated duct progenitor. After leaving the duct it turns into an acinus cell, gradually approaching the Langerhans islet. After crossing its border it becomes an islet cell, and proceeds toward the islet center. Its population size dwindles exponentially until at islet center all cells are eliminated.

Animals↗
PubMed1989

A double staining method for measuring DNA content of specific cell populations utilizing computerized microscopy.

A method for identifying specific cell populations with the computerized microscope is described. This method utilizes double staining techniques using immunofluorescent antibodies and the Feulgen technique. It was applied to measure the area and DNA content of the nuclei of beta-cells in patients with Persistent Neonatal Hypoglycemia with Hyperinsulinism (PNHH). A significant increase in the area and DNA content was found in nuclei of patients compared to a control group. This method may be applied to sample cells from other tissues as well.

Coloring Agents↗
PubMed1989

Necrotizing tracheobronchitis following mechanical ventilation of the newborn.

Mechanical ventilation of newborn infants with respiratory distress is associated with diverse pathology of the lung. Recent reports have focused on a distinct lesion pattern of the tracheobronchial system--necrotizing tracheobronchitis. While many advanced cases of the disease proved fatal secondary to airway obstruction, others were successfully treated by removal of the occlusion. We describe two neonates with necrotizing tracheobronchitis, one of whom had a complete occlusion of the right main stem bronchus that was relieved by curettage during bronchoscopic examination.

Bronchi↗
PubMed1988

Nesidiodysplasia--a histologic entity?

Five cases of persistent neonatal hyperinsulinemic hypoglycemia (PNHH) were studied by a combined immunofluorescent and Feulgen technique under a computerized microscope which was used to measure the area and absorbance of beta cell nuclei. An increase of 16% was found in the nuclear area and absorbance of the beta cells in PNHH cases, in comparison with age-matched control cases. A smaller increase (9%) was found in nuclear area and absorbance of non-endocrine ductal cells in PNHH cases. In all PNHH and control cases, higher values of nuclear area and absorbance were found for beta cells in the islets of Langerhans than for nesidioblasts. The increase in average size of beta cell nuclei in PNHH can be used as a morphologic criterion for diagnosis in these cases. The increased absorbance of the nuclei stained with the Feulgen reaction is the morphologic expression of polyploidy, and has a correlation to the metabolic activity of beta cells in this disorder. We conclude that, in contrast to the normal postnatal developmental process of nesidioblastosis, nesidiodysplasia is a well-defined histologic entity, manifested by an increase of beta cell nuclear size and its DNA content.

Humans↗
PubMed1988

The streaming liver. II. Hepatocyte life history.

Thirty male adult rats, were injected with [3H]-thymidine, [3H]TdR. The animals were killed in groups of five, at the following times: 1 h, 14, 30, 60, 90 and 120 days. The livers were fixed in formalin, embedded in paraffin and cut into 5-micron-thick sections, which were then dipped into liquid emulsion and exposed for 3 weeks. The grain content of each sampled cell was counted and its distance from the nearest portal tract rim measured. Since the cells were labelled once and the label was available only for a short period, cell displacement could be followed with time. One hour after labelling, most labelled cells were confined within the 300 micron distance from the portal space rim. From then on, labelled cells advanced at a daily velocity of 2.5 micron toward the terminal hepatic vein. The liver acinus is composed of two compartments: a progenitor compartment extending up to 300 micron from the portal tract and a functional compartment covering the remaining acinus portion. Such an arrangement is known as a two-compartment cell renewal system, and is found in renewing tissues like crypt-villus and epidermis. The hepatocyte moves from the portal space toward the terminal hepatic vein, proceeding along a trajectory, denominated as tissue radius. Since cells move in one direction, the further a cell is from the portal tract, the older it is. One may therefore estimate cell age by measuring its distance from the origin. Since the tissue radius portrays cells of all ages, it describes the entire life history of one cell. The advancing hepatocytes traverse the three acinus zones.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1988

The streaming liver. III. Littoral cells accompany the streaming hepatocyte.

In previous studies we have shown that hepatocytes stream from the portal tract toward the terminal hepatic vein. The present study provides evidence that littoral cells participate in the same cell stream and that the liver actually streams en masse. Littoral cells stand for sinusoidal endothelia and Kupffer cells. Thirty male adult rats, random bred, were injected with 0.5 microCi [3H]-thymidine, specific activity 5 Ci/mmol/g body weight. The rats were killed in groups of five, at the following times: 1 h, 14, 30, 60, 90 and 120 days. The livers were processed histologically and dipped into liquid emulsion for autoradiography. In each animal 50 labelled hepatocytes and 50 littoral cells were randomly selected and their distance from the nearest terminal portal tract rim was measured. Both cell populations renew their cells continuously. Each consists of two cell types, progenitors, residing around the portal tract up to the distance of 200 microns, and functional cells, which inhabit the rest of the acinus. The two regions where the different cell types reside are known respectively as progenitor (P) and functional (Q) compartments. Both cells are formed in the P-compartment and advance jointly along a trajectory, the tissue radius, toward the terminal hepatic vein where they die. They progress at a daily velocity of 2 micron. Since both advance at the same speed, as long as they exist they remain neighbours. Liver parenchyma and stroma thus stream en masse.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1987

Chloroquine treatment in desquamative interstitial pneumonia.

An infant presented with failure to thrive, tachypnoea, and hypoxia reversed by oxygen. Lung function showed decreased pulmonary compliance; lung biopsy showed desquamative interstitial pneumonitis. Chloroquine 10 mg/kg/day resulted in improvement and relapse when temporarily stopped. The patient was completely asymptomatic during four years' treatment and six months after stopping treatment.

Chloroquine↗
PubMed1986

Crohn's disease isolated to the appendix: truths and fallacies.

Twenty-five cases of Crohn's disease confined to the appendix were reported in eight hospitals in Israel during a 15-year period. Review of the histologic slides confirmed the diagnosis in 22 cases. Re-evaluation of these 22 patients included physical examination and radiologic studies of the small and large bowel. Rectosigmoidoscopy was performed in 16 patients. Signs and symptoms of Crohn's disease at other sites in the gastrointestinal tract did not occur during follow-up periods of two to 15 years (mean, 6.4 years) after appendectomy. This study and a review of the literature indicate that in most cases (93 per cent) Crohn's disease initially limited to the appendix is not a predictor of subsequent involvement of another portion of the bowel. It is concluded that the so-called Crohn's disease isolated to the appendix is a form of chronic granulomatous and follicular appendicitis of unknown etiology that is unrelated nosologically in the majority of the cases to Crohn's disease proper.

Adolescent↗
PubMed1986

The streaming adrenal cortex: direct evidence of centripetal migration of adrenocytes by estimation of cell turnover rate.

Thirty adult male rats were injected with 0.5 microCi [3H]thymidine/g body weight (specific activity 5 Ci/mmol) and killed, in groups of five, 1 h and 14, 30, 60, 90 and 120 days after injection. The displacement of labelled adrenocytes with time was estimated in autoradiograms of adrenal sections. The radial distance of the labelled cell from the capsule was measured with an eyepiece micrometer and expressed in cell location units, i.e. the number of cells separating the labelled cell from the capsule. One hour after labelling, 95% of labelled cells were confined to the outer quarter of the cortex. During the following days, adrenocytes were displaced inwardly, approaching the medulla at a velocity of 0.24 locations/day. They traversed the three cortex zones, reaching the medulla after 104 days. The three adrenal zones represent three differentiation states of the adrenocyte. When young, the adrenocyte secretes aldosterone, after leaving the glomerulosa it produces corticosteroids and on reaching the reticularis it produces sex hormones. The adrenal cortex is a cell renewal system made of two compartments. A progenitor compartment extending between locations 1 and 15, and a functional compartment, covering locations 16-64. The first compartment produces 0.47 cells daily, which enter the second. Half of them die on their way while the rest are eliminated in the reticular zone. The cell stream is nourished by a subcapsular stem cell.

Adrenal Cortex↗
PubMed1986

Autopsy findings of Serratia meningoencephalitis in infants.

Serratia meningoencephalitis is often a fatal disease that causes widespread destruction of brain tissue despite aggressive antibiotic treatment. The autopsy findings of 2 cases are described. In a case caused by S. liquefaciens, previously not reported as the causative organism of meningoencephalitis, suppurative meningitis, ventriculitis, vasculitis, and extensive necrotic process of the brain matter were found. In the other case, caused by S. marcescens, the findings were those of acute and subacute abscesses with hemorrhagic necrosis.

Bacterial Infections↗
PubMed1985

Hypoganglionosis of the myenteric plexus with normal Meissner's plexus: a new variant of colonic ganglion cell disorders.

A 16-year-old girl with a history of achalasia of the lower esophagus was investigated for progressive constipation since the age of five years. Normal ganglion cells of the Meissner's plexus were found in a mucosal rectal biopsy. Manometric studies showed absence of the normal rectosphincteric relaxation reflex. A long posterior rectal myectomy was performed in which no ganglion cells were found between the muscular layers. The patient underwent a rectosigmoid resection with a low anastomosis according to Duhamel. In the resected bowel, a normal Meissner's plexus was again found while marked hypoganglionosis of the myenteric plexus was evident. Intranuclear inclusion bodies in Schwann cells and scattered inflammatory cells were noteworthy. This case may be an example of an acquired hypoganglionosis localized to the myenteric plexus.

Adolescent↗
PubMed1985

Tracheo-oesophageal anomalies in the Goldenhar anomalad.

A case of the Goldenhar anomalad is presented with a previously undescribed association with oesophageal atresia and tracheo-oesophageal fistula. This is the second instance of a tracheobronchial-oesophageal communication being found in association with the anomalad. Awareness of this combination may facilitate future diagnosis and treatment of the anomaly.

Esophageal Atresia↗
PubMed1985

Structural abnormalities of the myenteric (Auerbach's) plexus in familial dysautonomia (Riley-Day syndrome) as demonstrated by flat-mount preparation of the esophagus and stomach.

The esophageal and gastric myenteric (Auerbach's) plexus were studied by a flat-mount preparation in 3 patients with familial dysautonomia. In 1 patient a typical esophageal network was found in the stomach. In another patient both esophageal and gastric plexus patterns were significantly different from normal. These changes, by producing abnormal nervous stimulation, may explain disturbed motility of the esophagus and stomach in familial dysautonomia.

Child↗