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Biomedical subjects

C Blomstrand

Publications and source records attributed to C Blomstrand.

At least 73 records · Page 4Linked to original sources
PubMed1984

Cerebrospinal fluid proteins and cells in men subjected to long-term exposure to organic solvents.

Cerebrospinal fluid (CSF) was obtained from 17 men occupationally exposed to organic solvents and diagnosed as having a psycho-organic syndrome. Healthy volunteers and patients without neurological disorders were used as controls. The albumin ratio was increased in three heavily exposed men, indicating an increased passage of albumin over the blood-brain barrier. A slight monocytoid reaction was present in three of the subjects in the exposed group. Myelin basic protein and enolase activity were within normal limits. Isoelectric focusing of CSF-enriched proteins obtained by absorption chromatography showed alterations in nine out of 17 exposed individuals: The most prominent change was a relative increase of the protein band with Ip 4.7.

Adult↗
PubMed1983

Macromolecular changes in brain stem of morphinized rats.

Incorporation of [3H]valine into trichloroacetic acid-(TCA)-precipitable, water-soluble or membrane-bound material of whole brain and brain-stem did not differ significantly in morphine-intoxicated, morphine abstinent and control rats. The animals were intoxicated with morphine (final dose 340 mg/kg b.w.) for 15 days, using an ingestion method with no impairment of the caloric intake compared to controls. Abstinent rats were withdrawn from morphine for 2 days after 13 days of intoxication. Measurements of [3H]valine or [14C]valine incorporated into soluble or membrane-bound brain stem proteins failed to demonstrate any significant changes in specific protein bands from morphinized rats. Separation was achieved by polyacrylamide gel electrophoresis with or without sodium-dodecyl sulphate (SDS) or by isoelectric focusing. After immunoabsorption chromatography to remove those proteins antigenically similar to serum proteins, an increase in the staining intensity and in incorporation of [3H]valine into two protein bands (with isoelectric points (Ip:s) 5.75 and 7.7) was seen in brain stem from long-term morphine-intoxicated rats. The results show that macromolecular interactions are involved in long-term morphine actions.

Animals↗
PubMed1983

Central nervous system involvement in early syphilis. Part 1. Intrathecal immunoglobulin production.

The immunological activity in the cerebrospinal fluid (CSF) was studied in 47 patients with early syphilis. The immunoglobulin production within the central nervous system (CNS) was estimated by analysing immunoglobulin G and albumin in CSF and serum and constructing an IgG index according to Tibbling et al. and calculating daily CNS IgG synthesis, according to Tourtellotte. In 10 (21%) of the 47 patients, intrathecal immunoglobulin production was observed. The immunoglobulin production within the CNS was significantly correlated to the presence of syphilis antibodies and to pleocytosis. Eight of the patients demonstrated oligoclonal bands on electrophoresis. Total protein usually did not reveal an increased CNS immunoglobulin production but reflected a blood-brain barrier lesion. One year after penicillin treatment, 2 out of 9 patients still had slight intrathecal immunoglobulin production.

Adult↗
PubMed1983

Central nervous system involvement in early syphilis. Part II. Correlation between auditory brain stem responses (ABR) and cerebrospinal fluid abnormalities.

Twenty-six consecutive patients with secondary or early latent syphilis, all with normal neurological findings, were studied with auditory brainstem responses (ABR), cerebrospinal fluid (CSF) analysis and an assay for immune complexes in serum and CSF. Seven of the 26 patients studied had a pathological ABR pattern and 14 had one or more pathological CSF tests. Fifteen patients had circulating immune complexes in serum. No patient had demonstrable immune complexes in CSF. A significant correlation was found between an abnormal ABR pattern and pathological CSF findings--but not between pathological ABR and presence of immune complexes. ABR seems to be a sensitive method for detection of early asymptomatic CNS involvement in syphilis.

Adolescent↗
PubMed1982

Cerebrospinal fluid proteins and cells in normal-pressure hydrocephalus.

A total of 21 patients with normal-pressure hydrocephalus were examined. Cerebrospinal fluid (CSF) was collected before and after operation with a ventriculoperitoneal shunt. A slight plasma-like protein pattern indicating a blood-brain barrier (BBB) dysfunction was seen in 38% of the patients before operation. No characteristic changes could be found in the "CSF-specific" protein fraction. After the shunt operation 65% of the patients had a BBB dysfunction to macromolecules and 70% had two additional acidic protein bands in the CSF-specific fraction. Ventricular CSF protein content was 73% of lumbar CSF content when shunts were patent. Isotope encephalography showed a radionuclide accumulation at the intracranial part of the shunt system, indicating that the BBB damage might be located round the shunt catheter.

Blood-Brain Barrier↗
PubMed1982

Cerebrospinal fluid "specific" proteins in various degenerative neurological diseases.

Cerebrospinal fluid (CSF) from patients suffering from various degenerative neurological diseases was fractionated into "CSF-specific" and antigenically serum-like proteins, using affinity chromatography with antihuman serum antibodies. The samples were isoelectric focused. Protein patterns were compared to similarly treated CSF from young normal volunteers and age matched controls. Several changes are described and 2 pathological patterns of the CSF-specific fraction could be identified. One pattern was characteristic for Alzheimer's dementia (AD) and senile dementia of the Alzheimer type (SDAT), but also seen in a few other diseases. The other pattern was seen in several of the investigated groups, most prominent in Huntington's chorea.

Adolescent↗
PubMed1982

The clinical effect of lumbar puncture in normal pressure hydrocephalus.

Owing to all the difficulties involved in selecting patients with normal pressure hydrocephalus for shunt-operation, a cerebrospinal fluid-tap-test (CSF-TT) is introduced. Psychometric and motor capacities of the patients are measured before and after lumbar puncture and removal of 40-50 ml CSF. Patients fulfilling criteria for normal pressure hydrocephalus were compared to patients with dementia and atrophy shown by computed tomography. Normal pressure hydrocephalus patients showed temporary improvement after lumbar puncture. The extent of the temporary improvement appeared to be well correlated with the improvement after shunt operation. Accordingly, the CSF-TT seems to be of value when selecting those patients who will probably benefit from a shunt operation.

Adult↗
PubMed1981

Cerebrospinal fluid specific proteins in multiinfarct and senile dementia.

Cerebrospinal fluid (CSF) from patients suffering from senile dementia (SD) and multiinfarct dementia (MID) was fractionated into CSF-specific and antigenically serum-like proteins, using affinity chromatography with antihuman serum antibodies. The samples were isoelectric focused. Protein patterns were compared to similarly treated CSF from patients suffering from transient ischemic attacks (TIA), or normal volunteers. Characteristic changes were found in the CSF-specific protein pattern from SD patients.

Adult↗
PubMed1981

Cerebrospinal fluid investigations in multi-infarct dementia and senile dementia.

Thirty-eight demented patients were clinically investigated and classified into a multi-infarct dementia (MID) and senile dementia (SD) group. Total protein, albumin, immunoglobulin G, agar gel electrophoretic protein and iso-electric focusing pattern were determined in CSF and serum as well as the lactate dehydrogenase, LD-iso-enzyme pattern and uric acid. No significant differences were found regarding total protein, albumin and immunoglobulin G. The agar gel electrophoresis showed a tau-globulin increase in 18% of the SD-group against 6% of the MID group. The patterns were, however, plasma-like in 56% of the MID group against 23% of the SD group. The iso-electric focusing pattern showed an abnormal band in some SD-patients which was not found in the MID group. The uric acid and LD-enzyme concentration was equal in both CSF and serum. An index [Formula: see text] was calculated to give an approximate correction for the influence of different permeability of the blood-brain and CSF barrier. A significantly higher LD-index was found in the SD-group, suggesting a continuous cell degeneration.

Aged↗
PubMed1980

Separation of cerebrospinal fluid specific proteins -- a methodological study. Part I.

A method for preparative separation of cerebrospinal fluid specific proteins by affinity chromatography and isoelectric focusing is described. It has been tested on CSF from a group of human patients suffering from TIA. The advantage of the method is the production of a protein pattern easy to survey by eye. The sensitivity and reproducibility are adequate, as tested by model experiments described.

Aged↗
PubMed1980

Cerebro-spinal fluid concentrations of pirenzepine after therapeutic dosage.

In order to investigate a possible central nervous action of pirenzepine, an anti-ulcer drug with structural similarities to tricyclic psychotropic drugs, serum and cerebrospinal fluid concentrations of pirenzepine have been measured in five healthy volunteers after therapeutic dosage over 2.5 days. The cerebrospinal fluid:serum ratio was 0.095:1, indicating that pirenzepine passed the blood-brain barrier, but only to a small extent. The pirenzepine concentrations in the cerebrospinal fluid were for each volunteer on average about 10% of those found in serum. These findings correspond to the lack of central effects of pirenzepine as shown in animal and human experiments.

Adult↗
PubMed1975

Ultrastructural studies on cerebrovascular permeability in acute hypertension.

Acute hypertension, experimentally induced by intravenous injection of metaraminol in adult rabbits, rapidly induced a damage of the blood-brain barrier in the cerebral cortex, as visualized by Evans-blue-conjugated albumin and horseradish peroxidase. Extravasation of these two exogenous tracers was demonstrated to occur in arterioles, in capillaries and, rarely, in venules. Peroxidase passed the endothelial cell into the nervous tissue in either or three different ways, i.e. through channels, often sigmoidshaped, in the cytoplasm, and transendothelial pinocytosis. The third pathway could, although rarely, be demonstrated between adjacent endothelial cells after cleavage of junctional complexes. The tracer peroxidase was further spread along the blood vessel within the basement membrane and in the extracellular space of the brain. Damaged endothelial cells with diffuse cytoplasmic peroxidase activity and large vesicles were occasionally observed within the areas with blood-brain barrier injury. There were also signs of increased pinocytotic activity in endothelial cells outside the barrier damaged cortical areas. Nerve cells and neuroglial cells could show either a diffuse cytoplasmic peroxidase activity or a vesicular location of the tracer, or sometimes both. The observations are discussed in relation to previous studies on the mechanism of transendothelial passage of protein tracers at blood-brain barrier damage.

Animals↗
PubMed1975

Amino acid incorporation into neurons and glia of guinea pigs with experimental allergic encephalomyelitis.

After in vitro incubation of brain slices from guinea pigs in the intermediate (10 days postinduction) stage of experimental allergic encephalomyelitis (EAE), incorporation of [14C]leucine into protein was increased in a glial-enriched fraction. By the late (17-18 days postinduction) stage of the disease, when EAE symptoms were manifest, both the neuronal- and glial-enriched fractions showed increased specific activity of their total protein. SDS polyacrylamide gel electrophoresis showed that the increased leucine incorporation occurred in those proteins which labeled in a control material. After intraperitoneal injection of [3H]leucine the incorporated radioactivity was slightly increased in unfractionated brains from EAE animals. The neuronal-glial ratios for protein-bound radioactivity indicated that the increased incorporation resided mainly in the glial population.

Animals↗
PubMed1975

Evidence for differential function of neuronal and glial cells in protein metabolism and amino acid transport.

Amino acid incorporation in neuronal and glial cells has been investigated in several laboratories employing bulk-separation techniques to obtain cell-enriched fractions. The relative rates of incorporation into the proteins of both cell types vary substantially with the method of isotope administration. Through the use of single-pulse perfusions with a duration of 30-40 sec the early time course of labeling has been studied. The difference between neuronal and glial cells with respect to indicating cell interactions will be discussed. The in vitro amino acid incorporation has been measured in neurons and glia after slice incubation. In material from animals developing experimental allergic encephalitis the rate of 3H-leucine incorporation more than doubles in the unfractionated brain. Glial cells increased their rate of incorporation by approximately 400% under the same conditions. The involvement of specific proteins in the cells and organelles has been studied by gel electrophoresis. The high uptake capacity of glial cells for certain amino acids with possible transmitter function has been further characterized. The release of these substances is measured in a superfusion system where beds of cells, preloaded with the labeled substance, are used. High potassium pulses stimulate release of, for example, GABA in both neuronal and glial cells.

Amino Acids↗
PubMed1975

Blood-brain barrier lesions in acute hypertension in rabbits after unilateral X-ray exposure of brain.

Acute hypertension was induced by metaraminol at different time intervals following irradiation in rabbits exposed to unilateral X-ray irradiation against the brain (3000 R) and in control animals. Hypertension resulted in a few areas of Evans blue extravasation in control animals. In the irradiated animals there was a marked increase in tracer extravasation on the half of the brain exposed to X-rays, indicating an increased vulnerability of cerebral vessels to blood pressure increase after irradiation.

Acute Disease↗
PubMed1975

Tritiated methylmercury in the brain of squirrel monkeys.

Tritiated methylmercuty hydroxide (MeHgOH) with a specific activity of 306 curies/mol was synthesized by a Grignard reagent from tritiated methyl iodide with a yield of 70%. Tritiated MeHg was given to squirrel monkeys by stomach tube in weekly doses of 0.8 mg/kg. The animals were killed after one dose or six doses. The distribution of the substance in the brain was then studied by microautoradiography and by fractionation of brain tissue into cellular and subcellular fractions. Part of the MeHg in the brain is in a water-soluble form. Methylmercuty was found autoradiographically mainly in the neuropile of the cortex. At subtoxic doses (one dose), more protein-bound radioactivity was found in the glial fraction than in the neuronal fraction. At toxic dose (six doses), the protein-bound fraction of MeHg increased significantly (P less than .02) in the neurons relative to nontoxic dose (one dose). Methylmercury was demonstrated autoradiographically in damaged neurons but not in undamaged neurons.

Animals↗
PubMed1975

Amino acid incorporation into brain subcellular fractions in experimental allergic encephalomyelitis.

The in vitro protein synthetic capactiy of brain slices from guinea-pigs in the late stage (17-18 days post-induction) of experimental allergic encephalomyelitis was increased over that of Freund's adjuvant injected controls, as determined by the rate of (14C)-leucine incorporation into both tris-soluble and tris-insoluble proteins. All subcellular fractions prepared from incubated slices showed increased incorporation, with a crude nuclear fraction having the largest increase. Isolated brain mitochondria from EAE animals incorporated more amino acid into protein during the late stage of the disease, while isolated microsomes and "pH5 enzymes" show decreased amino acid incorporation compared with controls in the late stage of EAE. Polyacrylamide gel electrophoresis of acidic, soluble proteins isolated from (3H)-leucine labeled nuclear or synaptosomal fractions revealed that increases of incorporation were generalized, and not restricted to a few proteins.

Amino Acids↗