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Biomedical subjects

B Sundström

Publications and source records attributed to B Sundström.

At least 19 recordsLinked to original sources
PubMed1990

A two-site enzyme-linked immunosorbent assay for cytokeratin 8.

A monoclonal enzyme-linked immunosorbent assay (ELISA) was developed for the determination in biological fluids of cytokeratin 8, a potential marker for malignant diseases. Two monoclonal antibodies (MAbs), TS 3 and TS 4, with different epitope specificity, were selected from 4 cytokeratin-8 reactive antibodies. TS 3 was used for coating and TS 4 as HRP-conjugate, respectively. Antibodies were selected with the aim of optimizing the discriminatory capacity between cytokeratin 8 levels in sera from healthy persons and from patients with malignant diseases. In sera from healthy individuals the mean value was determined to be 3.1 +/- 2.3 ng/ml with an upper cut-off level of 7.8 ng/ml (+ 2 SD) using purified cytokeratin 8 as standard. Sera from patients with colon cancer and pancreatic cancer were found to have significantly elevated levels, showing a 4- to more than 10-fold increase compared with the normal level. In patients with ovarian cancer no significant elevation was seen. Cytokeratin 8 monitoring may be of value for patients with colon and pancreatic cancer.

Antibodies, Monoclonal↗
PubMed1990

Radio-immunolocalization in nude mice using anticytokeratin monoclonal antibodies.

Four monoclonal antibodies reactive with the rod portion of human cytokeratin No. 8 were evaluated using experimental tumour radio-immunolocalization. Nude mice carrying human HeLa cell tumours were injected with 125I-labelled F(ab')2 fragments or intact IgG antibodies. Positive immunolocalization was observed with all the specific antibodies, the intact antibodies being superior to their analogous F(ab')2 fragments. High localization efficiency was observed despite the fact that the targets are intracellular filaments. The presence of necrotic areas in the tumours may favour the high uptake in the tumours. By computerized gamma-scintigraphic evaluation of the antibody distribution in the animals, several kinetic parameters of the antibody behaviour in vivo could be determined. The biological half-lives in the tumours were determined to be greater than 600 h for some of the antibodies compared to a half-life of 40-80 h in non-tumour tissues. Optimal imaging was obtained as late as 10-14 days after administration of the antibody. Up to 10% of the injected antibody could be identified in the tumours, indicating a potential value in radio-immunolocalization and radio-immunotherapy using anticytokeratin antibodies.

Adenocarcinoma↗
PubMed1989

The levels of zinc, copper, manganese, selenium, chromium, nickel, cobalt, and aluminium in the meat, liver and kidney of swedish pigs and cattle.

The levels of zinc, copper, manganese, selenium, chromium, nickel, cobalt, and aluminium were determined in samples of meat, liver and kidney from pigs and cattle from Swedish slaughterhouses. The results have been compared with those reported from other investigations carried out in recent years. For zinc, copper, manganese and selenium, the mean levels found in the different tissues were very similar to those reported in previous studies. The mean levels of chromium and nickel were found to be in the range less than 0.010-0.015 mg/kg, regardless of the type of tissue. Cobalt levels ranged from 0.001 to 0.043 mg/kg, the highest levels being in the liver samples. The mean levels of aluminium were between 0.024 and 0.068 mg/kg. Tissues from cattle contained approximately twice as much aluminium as tissues from pigs. Analytical quality assurance was carried out by analysing standard reference materials. A great effort was made to minimize and check contamination. This may partly explain the fact that the levels of chromium, nickel, and aluminium found in the present study are among the lowest reported.

Aluminum↗
PubMed1989

Clinical picture of snuff dipper's lesion in Swedes.

In a survey of oral mucosal lesions in 20,333 individuals, 1,466 individuals with snuff dipper's lesions were found. All but seven of the snuff dippers were men, which gives a prevalence of snuff dipper's lesions of 15.9% in the male population. Four degrees (1-4) of clinical severity of lesions were allotted. There were positive correlations between the severity of the lesion and years with the habit, daily amount of snuff used, time with contact between snuff and the oral mucosa, and, to some extent, with age of the snuff dipper. There were differences between the different brands of snuff as regards the severity of the snuff dipper's lesion produced.

Adolescent↗
PubMed1976

Adenosine triphosphate hydrolysis in rat dental tissues. A histochemical study of ion dependencies.

The effect of EDTA-decalcification, reactivating and activating procedures on the hydrolysis of ATP was studied histochemically in developing dental tissues in the rat. The incubation media contained lead citrate at alkaline pH and lead nitrate at neutral pH, and the results with ATP as substrate were compared with those obtained with beta-glycerophosphate. The ion dependency of ATP hydrolysis could only be ascertained in decalcified sections. As in earlier studies on the hydrolysis of beta-glycerophosphate in dental tissues, this hydrolysis could readily be reactivated through preincubation of the sections in a series of 0.1 M solutions of divalent cations; Zn2+ being the most efficient. This treatment was now found also to give rise to an ATP hydrolysis, which occurred without the need for activating ions in the incubation medium. This ATP hydrolysis should thus be described as nonspecific and, in terms of ion dependency, as due to a metalloenzyme, i.e. alkaline phosphatase. Activating ion dependent ATP hydrolysis in the dental tissues was found in the blood vessels and in the apical part of the secretory ameloblasts. The former was activated by Mg2+, Ca2+ and Mn2+, and the latter by Ca2+ and--almost specifically--by Sr2+. Preincubation with Zn2+ always inhibited the ion dependant ATP hydrolysis in the dental tissues.

Adenosine Triphosphatases↗
PubMed1976

Adenosine triphosphate hydrolysis in rat dental tissues. A histochemical study to differentiate the enzymes involved.

The purpose of this study was to try to differentiate histochemically between the various enzymes which may catalyze the hydrolysis of ATP in developing rat dental tissues. Freeze cut and freeze dried sections of molar and incisor teeth were incubated in lead capture-based media at pH 5.0, 7.2 or 9.4 with one of the following substrates: beta-glycerophosphate, AMP, ADP, ATP, AMP-PNP and tetrasodium pyrophosphate. To establish the enzymatic nature of the hydrolysis parallel sections were incubated after prior fixation in either formaldehyde or glutaraldehyde. By comparing the enzymatic stainings obtained with the various substrates and at the different pH:s, it was concluded that ATP can be visibly hydrolyzed in rat dental tissues by alkaline phosphatase (stratum intermedium, apical part of maturation ameloblasts, basal part of all ameloblasts, odontoblasts and subodontoblastic layer), specific ATPase (apical and basal parts of secretory ameloblasts) and ATP pyrophosphatase and/or adenylate cyclase (stratum intermedium, odontoblasts). Acid phosphatase, specific ADPase, 5'-nucleotidase, inorganic pyrophosphatase, 3':5'-cyclic-AMP-phosphodiesterase and adenylate kinase on the other hand, seem not to be engaged in the ATP hydrolysis to such a degree as to complicate the interpretation of the histochemical staining. The alkaline phosphatase part of the ATP hydrolysis appeared to be rather insensitive to aldehyde fixation, while the hydrolysis effected by specific ATPase and ATP pyrophosphatase and/or adenylate cyclase was extinguished after fixation with formaldehyde for 4 h or glutaraldehyde for 10 min.

Acid Phosphatase↗
PubMed1976

The relation of the clinical picture to the histopathology of snuff dipper"s lesions in a Swedish population.

The relation of the clinical picture of snuff dipper's lesions to the histopathological appearance was studied in 114 male dippers aged 20-88 years. Histological study revealed increased epithelial thickness, a vacuolated surface layer with wavelike, eosinophilic spikes directed toward the surface having a narrow, eosinophilic band as a demarcation toward the prickle cell layer, acanthosis, and a slight inflammatory reaction. Thirteen cases showed an increased number of eosinophilic granulocytes, and nine cases contained amorphous, weakly eosinophilic areas in the connective tissue papillae. No epithelial dysplasia was observed. Increased epithelial thicknees, especially the presence of a vacuolated surface layer, was the only histologic feature that could be correlated with the severity of clinical appearance of the lesions. Deeply located changes, like inflammation and amorphous areas, however, were not reflected in the clinical grading of the lesions.

Adult↗
PubMed1975

Tissue reactions to some dental implant materials. An in vivo study in white rats.

In a 10 week experimental investigation the tissue reactions to implantation of standardised test pieces made of a polysilicone, Silastic, Tantalum, Titanium and a cobalt-chromium alloy, Vitallium, were studied in the white rat. After 2 weeks, polysilicone, Tantalum and Titanium caused slight reactions whilst a comparatively strong round cell infiltration was observed around the cobalt-chromium test pieces. After 10 weeks, no cellular infiltration was demonstrable around any of the implant materials. The now all appeared inert and were surrounded by a tough connective tissue.

Animals↗