Regulated expression of a receptor for hyaluronan-mediated motility on human thymocytes and T cells.

A receptor for hyaluronan-mediated motility (RHAMM) has been shown to promote cell locomotion. Among human T lineage lymphocytes, RHAMM is expressed only on a subset of thymocytes, being absent on mature peripheral T cells from blood, spleen, and lymph node. Among thymocytes, RHAMM is selectively expressed on a subset of CD3+ CD45RA+R0+ cells, and functions in motility as shown by the ability of anti-RHAMM to reduce the speed of thymocyte locomotion from 11 microns/minute to 3 microns/min.

Inhibition of delta aminolevulinic acid dehydratase activity by aluminum.

1. Studies were performed regarding the effects of aluminum chloride and aluminum nitrate in concentrations of 5 mg/kg of body weight on the delta aminolevulinic acid dehydratase activity, iron level and hematological parameters. Wistar rats were exposed to these pollutants for 10, 20, 40 and 80 days.

Bone healing after bone marrow stromal cell transplantation to the bone defect.

In experimental studies on rabbits, osteogenic properties of stromal cells were confirmed after in vitro growth for 7 and 14 d. The cell suspension was percutaneously transplanted into a surgically produced bone defect in the rabbit's radius. The bone scar produced was X-rayed, and histologically and mineralogically examined after 10, 20 and 40 d follow-ups.

Effect of haemodialysate and its peptide fractions on acetylcholinesterase activity in erythrocytes from healthy subjects and patients with terminal renal failure.

The effects of haemodialysate and its three peptide fractions on acetylcholinesterase (AChE, E.C. 3.

The effect of aluminum on the stromal cells (in vitro) on bone marrow in rats.

The aim of this study was to describe the effects of aluminum on the stromal cells of rat bone marrow using a combination of in vivo exposure and in vitro culture of bone marrow. The toxic effects of aluminum are manifested by a decrease in the erythrocyte count and hemoglobin level in the peripheral blood. Aluminum stimulated an increase in the number of fibroblasts while the macrophage count dropped.

Effect of haemodialysate and its peptide fractions on lactate dehydrogenase activity in erythrocytes from healthy subjects and patients with end-stage renal disease.

The effect of haemodialysate and its 3 peptide fractions on lactate dehydrogenase activity in erythrocytes was studied in patients treated by repeated haemodialysis for end-stage renal disease and in healthy subjects. Erythrocytes from dialyzed patients showed significantly lower LDH activity than those from healthy subjects. After a 3-h incubation with haemodialysate (675 and 450 micrograms protein/ml), or its peptide fraction III (270 and 190 micrograms protein/ml), a significant inhibition of LDH activity was observed.

Effect of vasopressin, oxytocin and LHRH on the proliferation and metabolism of rat bone marrow stromal cells in culture.

Effect of vasopressin, oxytocin and LHRH (10 and 20 pg/ml medium) on the proliferation and metabolism of cultured rat bone marrow stromal cells was investigated by methyl-3H-thymidine incorporation, cytochemistry and estimation of enzyme activities. Vasopressin did not change of the activity of tetrahydrofolate dehydrogenase (4HFDH), lactate dehydrogenase (LDH), glucose-6-phosphate dehydrogenase (G6PD) and the level of reduced glutathione (GSH). However, the higher concentration of vasopressin significantly lowered the activity of acetylcholinesterase (AchE).

In vitro effect of copper on the stromal cells of bone marrow in rats.

The effect of copper in form of copper sulphate (CuSO4 x 5 H2O) was studied in the bone marrow cells of rats of Wistar strain in an in vitro culture. Evident differences between tissue cultures of the bone marrow cells were observed between the control and experimental groups. In the experimental group, the CFU-F colonies appeared as early as in 3rd day while in the control group in 5th day.

Effects of aluminum on erythroidal cells in bone marrow in rats.

The study has been carried out on Wistar rats. The aim of the present study was to trace the effect of aluminum on erythroidal cells in bone marrow in rats. The number of proerythroblast after 10 days of experiment with aluminum slowly decreased up to 80 days of experiments.

The effect of aluminium upon the activity of selected bone marrow enzymes in rats.

This study was carried out on male Wistar rats. The bone marrow activities of acetylcholinesterase (AchE-EC.3.

The effect of aluminium on the heam biosynthesis (in vitro) in bone marrow cells in rats.

The study has been carried out on male Wistar rats. The aim of the present study was to trace the effect of aluminium chloride and aluminium nitrate at concentration 10 microM and 20 microM on haem biosynthesis in vitro in bone marrow cell culture. The ability of haem biosynthesis in bone marrow cell culture after 48 h of experiments with aluminium chloride and aluminium nitrate significantly decreased in relation with the control value.

Effect of recombinant human alpha interferon (INF) and antilymphocyte globulin (ALG) on normal and aplastic anaemia haematopoietic progenitor cell growth.

The effect of recombinant alpha interferon (INF) and of antilymphocyte globulin (ALG) to the colony stimulating factor (CSF) production was examined with in vitro culture of the bone marrow of healthy and of aplastic anaemia (AA) persons. In healthy persons the supernatant of lymphocytes preincubated with PHA and ALG was found to show a stimulating effect to clonogenic properties of marrow progenitors, the mentioned effect being not in proportion to the concentration value. Similar properties are shown by interferon in these persons.

Effect of recombinant human alpha interferon (INF) on chronic granulocytic leukaemia (CGL) clonogenic growth of bone marrow haematopoietic progenitors.

The effect of recombinant alpha interferon (INF) to the colony stimulating factor (CSF) production was examined with in vitro culture of the bone marrow of patients with chronic granulocytic leukaemia (CGL). It could be found that addition of interferon into a suspension of preincubated phytohaemagglutinin (PHA) lymphocytes from peripheral blood represents an inhibity factor for colony and cluster formation in autologic human marrow cultures.

In vitro effect of copper on the stromal cells of bone marrow in rats.

The effect of copper in form of copper sulphate (CuSO4 x 5 H2O) was studied in the bone marrow cells of rats of Wistar strain in an in vitro culture. Evident differences between tissue cultures of the bone marrow cells were observed between the control and experimental groups. In the experimental group, the CFU-F colonies appeared as early as in 3rd day while in the control group in 5th day.

Metabolism of red blood cells after short-term exercise in rats.

The aim of this study was to determine the changes of the basic parameters of the erythrocyte system and the activity of some red blood cell (RBC) enzymes prior to and after a single physical effort leading to exhaustion. The study was carried out on male Wistar rats subjected to running on an electric rotating drum at a speed of 25 m/min. A single exercise caused a decrease in the RBC count, haemoglobin concentration (Hb) and haematocrit (Hct) by 21.

Effect of lead on the stromal cells of bone marrow in rats in vitro.

The effect of lead on the stromal cells of bone marrow in rats was studied in cultures in vitro. Toxic effects of lead were manifested by a decrease in erythrocyte count and hemoglobin level in peripheral blood. Lead stimulated an increase in the number of fibroblasts, while the macrophage count dropped.

In vitro effects of phorbol and phorbol ester on the proliferation and enzyme activities of bone marrow stromal cells in rats.

Stromal cells obtained from bone marrow of Wistar rats were cultured in liquid medium. The cultures were divided into control and experimental groups. After 24 h of culture, the medium was removed and replaced by a new one containing 10(-6) and 10(-9) M 4 beta-phorbol or phorbol 12,13-diacetate ester in the experimental cultures, or phorbol solvent alone in control cultures.

Effect of mercury and combined effect of mercury and dimethylsulphoxide (DMSO) on the activity of acetylcholinesterase (AchE-E.C. 3.1.1.7) of rat lymphocytes during in vitro incubation.

The effect of mercury and combined effect of mercury and DMSO on the activity of acetylcholinesterase of rat lymphocytes was studied during in vitro incubation. It was found that mercury is a very strong inhibitor of AchE. Dimethylsulphoxide performs a protective role for this enzyme.

In vitro patterns of enzymic tetrahydrofolate dehydrogenase (EC 1.5.1.3) expression in bone marrow stromal cells.

The toxicity of antifolate drug therapy on microenvironmental function of hemopoietic marrow stromal cells may be critical enough to justify the development of a simple cell culture model to appraise the dihydrofolate reductase (DHFR)/tetrahydrofolate dehydrogenase (EC 1.5.1.

Resistance of KP and CBA mice to cadmium chloride assessed on the basis of the bone marrow stromal cell growth in vitro.

Using a culture of bone marrow stromal cells, resistance of two inbred mice strains, KP and CBA, to cadmium chloride was assessed. Mice were administered with a single dose of CdCl2 (12 mumoles (kg b. wt) and bone marrow cells were examined after 7 days of culture.

Effects of acetylphenylhydrazine (APHZ) on the stromal cells of the bone marrow in rats (in vitro).

The study has been carried out on Wistar rats. The animals were divided into two groups: the control rats received 0.9% saline solution intraperitoneally in there consecutive days.

The effect of intrarenal nickel subsulfide injections upon the activity of selected erythrocyte and bone marrow enzymes in rats.

The experiments were carried out on Wistar rats. The animals were divided into five groups: Group 1: control group; Group 2: the animals received a single intrarenal dose of nickel subsulfide (Ni3S2) in saline; Group 3: the animals receiving a single intrarenal dose of saline; Group 4: the animals receiving a single intrarenal dose of Ag2S in saline; Group 5: the animals receiving a single intrarenal dose of activated charcoal in saline. Prior to the procedure peripheral blood indices were determined.

Post-exercise anaemia as a result of exercise overloading of the organism.

The aim of the present study was to determine the relation between the exercise load used in training and the changes in the basic parameters of the erythrocytic system. The experiments were carried out on 33 Wistar rats (females and males). The animals were forced to run at a velocity of 1.

The activity of erythrocyte enzymes in rats subjected to running exercises.

The studies were carried out on male Wistar rats subjected to running within an electric rotating drum. The animals were divided into four experimental groups, differing one from another as to the duration of training. Each training session lasted 30 days.