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Biomedical subjects

L Popović

Publications and source records attributed to L Popović.

At least 19 recordsLinked to original sources
PubMed1998

The relation between plasma lipid levels and pseudocholinesterase activity in hypothyroidism.

The relation of plasma lipids and pseudocholinesterase (PChE) activity was studied in rats made hypothyroid by treatment with propylthiouracil (0.05% in drinking water for 28 days) and in hypothyroid patients prior and after L-thyroxine-therapy (1. week 25-50 microg, 2.-4. week 100 microg daily). In rats, thyroid hormone deficiency caused a significant increase in plasma and adipose tissue PChE activity as well as total plasma cholesterol (TC) concentration, and a decrease in plasma triglyceride (TG) concentration. In contrast to rats, thyroid-deficient humans demonstrated a decrease in plasma PChE activity and an increase in both TC and TG, in comparison with euthyroid controls. After one month's therapy with L-thyroxine, reversion of PChE activity and lipid concentrations occurred. The opposite changes of PChE elicited by thyroid hormone deficiency in men and rats are similar to the respective changes in lipoprotein lipase (LPL) activity, observed by other authors. The inverse correlation between both PChE and LPL activity and TG concentration suggests that PChE, similarly to LPL, may be involved in TG hydrolysis.

Adipose Tissue↗
PubMed1996

[Early aggressive treatment in severe craniocerebral injuries].

A series of 33 severely head injured patients, Glasgow Coma Scala score 8 or less, was studied prospectively. All patients were treated by the same protocols and by the physician. Intracranial pressure was monitored in all patients by ventricular puncture. Some degree of increased intracranial pressure (more than 10mmHg) was present at admission to the intensive care unit in 52% of cases. Increases in over 20mmHg during the monitoring period were seen in 15 patients (45%). In 5 patients (15%) he was over 20mmHg, but controlled in intensive care unit with combination of dexamethasone, hyperventilation, normothermia, furosemide and mannitol. In this group mortality rate was 80%. In 10 patients (30%) intracranial hypertension was uncontrollable despite intensive measures, in this group all patients died. The mortality rate in patients with intracranial pressure less than 20mmHg during the monitoring period was significantly lower, 25%. Uncontrollable intracranial hypertension is a serious prognostic sign; all affected patients in our series died. Even intracranial pressure more than 20mmHg, which could be controlled, was associated with high mortality rate (80%). By early aggressive treatment based on intracranial pressure monitoring we can diminish the incidence of intracranial hypertension and reduce overall mortality rate in patients with severe head injury.

Adolescent↗
PubMed1996

[Expansive processes in the optic chiasm region].

81 patients with expansive lesion in the optic chiasm region were reviewed. Pituitary adenomas were diagnosed in 37 patients: 5 with acromegaly, 2 with prolactinoma and the remaining 30 with hormone inactive adenomas. Meningiomas were diagnosed in 39, craniopharyngiomas in 4 patients and chordoma in one patient. The most common symptom was visual disturbance in 86%, but headache, hormonal disturbance occurred as well. All patients with adenomas were endocrinologically evaluated after detailed ophthalmologic and neurologic examinations. 28 patients were transcranially operated, 5 transsfenoidally and transcranially and 4 only transfenoidally. After endocrinologic reevaluation all patients with adenomas had undergone postoperative radiotherapy. Tumor recurrence was diagnosed in 14 patients, while 6 patients underwent reoperation. The approach to surgical regimen depended on the size and localization of meningioma. Unilateral subfrontal approach was most frequent (35). Subtotal tumor ablation was performed in 5 (13%) patients. Craniopharyngiomas were diagnosed in 4 patients (2 adults and 2 children). Total tumor ablation was performed only in one case.

Adenoma↗
PubMed1996

[Surgical treatment of compressive lumbar radiculopathy].

In the period 1982-1991, 1511 patients with compressive degenerative lumbar radiculopathy underwent surgery at the Clinic of Neurosurgery in Novi Sad. 1053 patients (69.69%) were operated due to radiculopathy of herniated disc etiology, 83 patients (5.50%) because od spondylotic radiculopathy and 38 patients (2.51%) because of spinal stenosis. 327 patients (21.64%) underwent surgery due to associated lesions, while 10 (0.66%) were operated because of other lesions. In patients with isolated disc herniations either interhemilaminectomy or extirpation of the degenerated pulp nuclei was performed, while in patients with spondylotic and stenotic radiculopathies most often decompressive laminectomy with facectomy and foraminatomy were performed. In cases of combined lesions combined surgical procedures were performed. There was no perioperative mortality. In 5 operated patients (0.33%) nonsurgical complications occurred, such as thrombophlebitis. Reoperation was performed in 94 patients (6.22%). Wound infection occurred in 4 patients (0.26%) and liquor fistula in 3 patients (0.20%). The paper presents diagnostic procedures, indications for surgical treatment and strategies.

Adolescent↗
PubMed1995

Our 10-year experience with embolized Wilms' tumor.

In the Department of Pediatric Surgery, Clinical Hospital Center Rebro in Zagreb, during the last 10 years a new method of invasive diagnostic and at the same time therapeutic procedure for the treatment of Wilms' tumor has been introduced. The treatment is preoperative Percutaneous Transcatheter Intraarterial Embolization (PTIE) of the renal artery. The aim of this procedure is to reduce vascularization, to decrease the mass of kidney affected by the tumor, to separate it from the surrounding tissue, to decrease intraoperative spillage of malignant cells into the blood stream and their metastasizing. As a result nephrectomy is easier to perform. It has been confirmed that it is best to perform nephrectomy 48 hours after embolization. The authors present their own experience with 33 patients, ranging from 1 to 16 years of age.

Adolescent↗
PubMed1995

[A completely organized extracerebral hematoma--case report].

Extracerebral hematomas, mostly caused by trauma, can be epidural or subdural according to their localization. According to their clinical picture they can be acute, subacute or chronic. Chronic epidural hematomas are extremely rare cases. Extracerebral hematomas are hemolyzed with time and fibrosis happens around them and, if not operated, they may appear finally as dural scars. Diagnostic and evolution of these hematomas can be presented by CT of the brain. They can be differential diagnostic problem in diagnosis of tumor of cranial bone, dura mater or brain. Definitive diagnosis is accomplished by pathoanatomic and pathohistologic examination. Treatment of these hematomas is mostly operative. This paper deals with a patient who suffered of completely organized dural scar that is very rare.

Diagnosis, Differential↗
PubMed1992

Interferon gamma alters the phenotype of rat thymic epithelial cells in culture and increases interleukin-6 production.

Rat thymic epithelial cells (TEC) in long-term culture were characterized by anticytokeratin monoclonal antibodies (mAbs) and electron microscopy. Phenotypic analysis performed by a large panel of mAbs showed that the highest percentage of these cells was of the subcapsular/medullary type. Recombinant rat interferon (IFN)-gamma up-regulated class-I and class-II MHC expression by TEC in culture as confirmed by immunohistochemistry and flow cytometry, but did not significantly alter other cell markers. TEC supernatants of IFN-gamma-treated cultures showed higher interleukin-6 (IL-6) activity, compared to the control, as determined by proliferation of the IL-6-sensitive B9-cell line. Increased IL-6 activity was probably not a consequence of increased TEC number in IFN-gamma-treated cultures because IFN did not significantly stimulate TEC proliferation in vitro. In contrast, IL-6 significantly stimulated TEC proliferation, indicating that this cytokine is not only a regulatory molecule for T-cell proliferation, but could also be an autocrine growth factor for thymic epithelium.

Animals↗
PubMed1992

Phenotypic and ultrastructural characterization of an epithelial cell line established from rat thymic cultures.

An epithelial cell line (TE-R 2.5) was established from a long-term culture of rat thymic epithelium. Its epithelial nature was confirmed using anti-cytokeratin (CK) monoclonal antibodies (mAb) and electron-microscopy. TE-R 2.5 cells were reactive with K 8.13, K 8.12, CK 8, R-MC 18, R-MC 19 and Mar 3 mAb and bind Ulex europaeus agglutinin I. Based on the results of this study it was concluded that they possess the phenotype of subcapsular/perivascular or medullary epithelium. This was in accordance with Western blot analysis of water-insoluble cell extracts showing the presence of 56,000, 52,000, 50,000 and 48,000 MW CK polypeptides. In addition, TE-R 2.5 cell line coexpressed CK and vimentin (a 57,000 MW polypeptide) which was demonstrated using dual immunohistochemistry and Western blot analysis. Electron microscopy demonstrated that TE-R 2.5 cells have all the characteristics of hypertrophic thymic epithelial cells (TEC) localized in situ exclusively in the medulla and thus further characterized this line as a type of medullary TEC. Finally, TE-4F10 mAb raised against an antigen of TE-R 2.5 cells selectively stained a subset of medullary TEC in situ including Hassall's corpuscles indicating again the medullary origin of this TEC line.

Animals↗
PubMed1991

Primary culture of rat thymic non-lymphoid cells: influence of culture time on the expression of macrophage differentiation antigens defined by monoclonal antibodies.

A panel monoclonal antibodies (mAbs) raised to rat thymic non-lymphoid cells has been shown to discriminate between distinct subpopulations of macrophages depending on their anatomic localization in the thymus. These reagents were used in this study to examine the expression of macrophage-associated antigens in primary culture of rat thymic stromal cells. The phenotype of both adherent macrophage (AM) monolayers and non-adherent cells (NAC) released in culture medium was studied at different time points after cultivation. More than 95% AM expressed ED1 and R-MC 38 antigens (pan-macrophage markers), class I MHC antigens (OX-18) and iC3b receptor recognized by OX-42 mAb. Most of them (70-85%) were reactive with ED2, R-MC 40, 41 and 42 mAbs specific for cortical and cortico-medullary zone (CMZ) macrophages. A much smaller percentage was positive with R-MC 43/44 and R-MC 46/47 mAbs staining CMZ/medullary macrophages and a subset of cortical macrophages, respectively. A minor subset of AM expressed class II MHC molecules which progressively decreased during cultivation. NAC were phenotypically heterogeneous. In comparison with adherent cells they contained a lower percentage of cortical/CMZ phenotype macrophages. In addition, NAC were slightly enriched in R-MC 43+ cells and more significantly expressed IA/E antigens (85-95%). ED3, R-MC 39 and 45 mAbs reactive with thymic macrophages in situ were mostly non-reactive with AM and NAC in culture.

Animals↗
PubMed1990

Detection of cross-reacting idiotypes in sera of lymphoma patients by inverse monoclonal radioimmunoassay.

An anti-idiotypic IgG1 kappa murine monoclonal antibody (MoAb) Y7 against purified monoclonal IgM lambda 1, derived from a patient with Waldenström's macroglobulinemia, has been generated. This antibody cross-reacted with the tumor-derived idiotypes of patients with B cell non Hodgkin's lymphoma as measured by competitive inverse solid radioimmunoassay using unpurified serum samples. Our results with the inhibition curves of 10 sera of normal donors and 60 sera of lymphoma patients indicate that 21 lymphoma patients revealed cross-reactivities greater than 7%, the mean value observed in normal donors. Of these, 5 sera cross-reacted strongly, in the range of 43-163%, revealing a frequency of positive cross-reactivity for MoAb Y7 of 1/12 sera of lymphoma patients. The generation of a panel of anti-idiotypic antibodies which cross-react with different tumor-derived Ig in serum may be valuable for monitoring the disease in a high proportion of NHL patients.

Antibodies, Monoclonal↗
PubMed1989

[Modern aspects of diagnosis and therapy of Wilm's tumor].

Real-time sonography of 12 cases with Wilms' tumour confirmed by the pathohistological finding was presented according to the ultrasonographic picture and the possibilities of radiotherapeutic treatment in dependence of the degree of disease. Uniform, irregularly reflective appearance of the tumourous tissue was observed in 58.3% of the patients, while the areas of necrosis and/or hemorrhage and cystic degeneration in the tumour accounted for 41.7%. Clear determination between the tumour and the normal parenchyma of the kidney was confirmed in 66.6% of the cases, while visualization of the normal tissue of the kidney was not possible in 25% of the patients. The treatment of patients with Wilms' tumour was narrowly coordinated by the program consisting of the surgical extirpation of the tumour, postoperative irradiation of the tumorous area at degrees II, III, IV and V and intensive adjuvant chemiotherapy.

Child↗
PubMed1989

[Case report on the empty sella syndrome].

The patient with "empty sella" syndrome was dealt with in this paper. This syndrome represented a remarkable differential diagnostic problem and was treated surgically.

Adult↗