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Biomedical subjects

A Breborowicz

Publications and source records attributed to A Breborowicz.

At least 91 records · Page 5Linked to original sources
PubMed1992

Chondroitin sulphate and peritoneal permeability.

We studied the effect of chronic intraperitoneal (ip) infusion of saline supplemented with the glycosaminoglycan-chondroitin sulphate 0.1% on the permeability and peroxidation of the peritoneal membrane in rats and compared this with the effect of saline infusion alone. Animals treated with chondroitin sulphate had a higher net ultrafiltration (uf), a slower glucose absorption from the dialysate and less trans-peritoneal loss of proteins. Chronic ip infusion of chondroitin sulphate reduced peroxidation of the peritoneum. These observations suggest that chondroitin may effect the peritoneal interstitium-an important barrier of fluid and solutes transport.

Animals↗
PubMed1992

Interactions of cells from peritoneal dialysate with mesothelial cells and fibroblasts in culture.

Peritoneal mesothelial cells and fibroblasts were co-cultured in vitro with peritoneal white blood cells (PWBC) obtained from CAPD patients, after an overnight exchange with 0.5% Dianeal or 2.5% Dianeal. Unstimulated PWBC inhibited proliferation of mesothelial cells and fibroblasts. Upon stimulation with lipoposaccharides (LPS), PWBC from the 0.5% dextrose exchange, enhanced the growth of mesothelial cells and fibroblasts, whereas when stimulated with LPS, PBWC from the 2.5% dextrose exchange increased only proliferation of fibroblasts.

Cell Division↗
PubMed1991

Effects of chondroitin sulphate on fluid and solute transport during peritoneal dialysis in rats.

The effect of chondroitin sulphate (CS) on peritoneal fluid and solute transport was studied in rats undergoing peritoneal dialysis. In the presence of CS, net ultrafiltration increased, while absorption of glucose and horseradish peroxidase from the peritoneal cavity decreased. Albumin, used instead of CS, did not modify either fluid or solute transport. In in vitro experiments on isolated rabbit mesentery, CS decreased transmembrane water flow induced by hydrostatic pressure, and its effect was not fully reversed 60 minutes after "wash-out" of this glycosaminoglycan. We postulate that the polyanionic CS molecules are trapped in the peritoneal interstitium, thus decreasing its hydraulic conductivity and permeability, which in turn increases net fluid removal during peritoneal dialysis because of its slower absorption from the peritoneal cavity.

Albumins↗
PubMed1991

Stimulation of mesothelial cells proliferation by endogenous growth factor(s).

We have attempted to determine whether human mesothelial cells (MC) have the power to influence their own proliferation. A serum-free medium was conditioned with the mesothelial monolayer for 24 hours and then applied to proliferating MC. Conditioned medium increased proliferation rate of MC. When the medium was heated at 60 degrees C for 60 minutes, the growth-promoting activity of the conditioned medium decreased by 50%, suggesting that MC produce at least 2 growth factors, 1 heat-labile and the other heat-stable. When MC were exposed continuously to a medium containing 90 mM glucose growth factor, production was decreased by 35%. However, when the cells were exposed to glucose only on alternate days, growth-factor production was similar to that in the control medium. On the other hand, MC exposed continuously for 10 days to 90 mM of glucose exhibited a weaker response to endogenous growth factor, even in a normotonic medium with low glucose concentration. Our results suggest that MC synthesize factor(s), which stimulate their own proliferation, and that high glucose concentrations interfere with this production and the subsequent action of growth factor.

Cell Division↗
PubMed1989

Permeability of different parts of the peritoneal mesothelium to solutes: an in vitro study.

The authors studied the in vitro permeability of different fragments of the rabbit's peritoneum to urea, inulin, horseradish peroxidase, and ferritin. Parietal peritoneum has a lower permeability to middle and large molecules than visceral peritoneum. In addition the local anesthetic, bupivacaine had a different effect on the mesothelial permeability of visceral peritoneum than on that of parietal peritoneum.

Animals↗
PubMed1989

Effect of various factors on peritoneal lymphatic flow in rabbits.

Peritoneal lymphatic flow in normal and uremic rabbits was measured by estimation of the disappearance of the radiolabelled 131I-albumin from the peritoneal cavity. The results show that lymph flow rate from the peritoneal cavity is not steady and depends on dialysate volume, its tonicity, and protein content. During peritoneal dialysis, peritoneal lymphatic flow is lower at the beginning of an exchange. Peritoneal lymphatic drainage is higher in uremic rabbits compared to normal controls.

Albumins↗
PubMed1989

Vasopressin-induced changes in permeability of peritoneal mesothelium for urea "in vitro".

Vasopressin (ADH) acts in humans mainly upon renal collecting tubules. By changing their water permeability it plays a key role in regulation of renal water excretion. Acting upon vascular smooth muscle cells, it causes vasoconstriction and raised arterial blood pressure. This hormone was also proven to cause constriction of cultured mesangial cels, it causes vasoconstriction and raised arterial blood pressure. This urea (Seldin, Giebisch 1985), to release the natriuretic hormone as well as to stimulate hepatic glycogenolysis (Abramov et al. 1987). The influence of vasopressin upon peritoneal transport of solutes was studied, too. ADH influenced the passage of phosphate and rubidium through the isolated rabbit mesentery (Berndt, Gosselin 1961) as well as sodium flux through isolated rabbit omentum (Shear et al. 1966). It caused the drop in urea dialysance in dogs subjected to peritoneal dialysis (Henderson et al. 1971). The subject of our study was the assessment of the action of the antidiuretic hormone under "in vitro" conditions upon the peritoneal transfer of urea, the solute present in human body fluids and removable by peritoneal dialysis.

Animals↗
PubMed1989

Effect of furosemide on transperitoneal passage of uric acid--experimental studies.

Application of furosemide (F) during peritoneal dialysis had been proposed for enlargement of peritoneal excretion of uric acid (UA), however, localization and mechanism of action of the drug remained obscure. To clarify the problem experimental studies on isolated peritoneum were performed with intention to establish whether and how transperitoneal flux of UA can be modified by F. Experiments were carried out in vitro on fragments of peritoneum taken from rabbits: parietal peritoneum and mesentery were isolated with single layer of mesothelium, and minimal amount of submesothelial tissue. Gradient of UA across the membranes was set up at 0.9-1.1 mmol/l, and flow estimated before and after addition of F (final conc. 10(-4) M) to the medium bathing either side of the membranes. Some differences in the flow between both types of the membranes as quantitative (greater flow in the parietal peritoneum), and qualitative (opposite succession of changes after F) were observed, however, the reaction for the diuretic was significant in both series of the experiments. The results confirm the suggestion that F can affect peritoneal excretion of UA during the dialysis, but at the same time they show that the mechanisms regulating the transperitoneal UA passage are complex.

Animals↗
PubMed1989

[Monoclonal antibodies OKT4 and OKT8 in the evaluation of cellular immunity in children with recurrent bronchitis].

The study aimed at evaluating cellular immunity in children with recurrent bronchitis with the aid of T-cells evaluation with rosette test and their subpopulations with monoclonal antibodies. The study involved 50 children aged between 2 and 14 years and 30 healthy children. Significant decrease in the absolute number and percentage of T-cells was seen in children with recurrent bronchitis. This decrease seemed apparent and probably resulted from the changes in receptors for sheep erythrocytes. Determination of T-cells subpopulation were within normal values as well as helper T-cells and suppressor T-cells ratio.

Adolescent↗
PubMed1988

An analysis of the edge damage of membranes studied in vitro.

A mathematical formula was developed for estimating the effect of membrane edge damage on the membrane permeability measured in vitro. It was assumed that in the chambers compressed against each other with identical force, the membrane edge damage depends on their radius and is characteristic for different tissues. Transport of rubidium and albumin across the human amnion and the rabbit mesentery was measured in two chambers with different active areas and this made it possible to estimate the extent of membrane edge damage.

Amnion↗
PubMed1984

Augmentation of peritoneal dialysis clearance with procaine.

Local anesthetic procaine in a 0.25% concentration was used as the adjunct to the dialysis fluid during peritoneal dialysis in rabbits. Procaine increased peritoneal clearance of urea (2.213 +/- 0.187 ml/min to 3.544 +/- 0.41 ml/min) and inulin (0.528 +/- 0.079 ml/min to 0.852 +/- 0.213 ml/min). Effect of the drug persisted, despite its lack, during the following cycles. Procaine influenced transmesothelial transfer of urea and inulin in vitro. The effect of the drug was biphasic. During the first 20 min a decrease of both solutes fluxes was observed. Then the transport rate of urea and inulin started to grow. The effect of procaine was independent of the membrane's side to which the drug was added. At least two sites of procaine action (vascular system and mesothelium) during peritoneal dialysis are proposed.

Animals↗
PubMed1981

Removal of endogenous lactates via the peritoneum in experimental lactic acidosis.

Peritoneal dialysis was used in experimental lactic acidosis caused by hypoxia for the removal of endogenous lactate. Two types of dialysis fluid, with and without vasodilator sodium nitroprusside, added intraperitoneally were used. The addition of sodium nitroprusside increased peritoneal the clearance of lactate as did an alkaline dialysis fluid containing bicarbonate. The highest clearance values were observed when alkaline dialysis fluid was used together with sodium nitroprusside.

Acidosis↗
PubMed1978

[Occupational dermatoses in workers of a building combine].

Examinations involved 33 building combine workers. Findings were as follows: occupational acne in 94% of workers, toxic dermatitis of epidermis and skin in 42% and allergic dermatitis of epidermis and skin in 9% of workers, resulting from work in exposure to cement, lime and oils.

Acne Vulgaris↗