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Biomedical subjects

T Kambara

Publications and source records attributed to T Kambara.

At least 163 records · Page 9Linked to original sources
PubMed1978

The chemical mediation of delayed hypersensitivity skin reaction. II. Characterization of a macrophage-chemotactic factor from bovine gamma-globulin-induced skin reaction in guinea pigs.

Macrophage-chemotactic factors were extracted from delayed hypersensitivity skin lesions induced by bovine gamma-globulin in guinea pigs. The most active factor, MCFS--1, was highly purified and found to be a heat-labile protein with a molecular weight of 150,000 and to possess in vivo as well as in vitro activity. This factor was homogeneous during polyacrylamide gel electrophoresis, and the chemotactic activity was associated exclusively with this band. Further characterization revealed that its isoelectric point was 6.7 to 6.9 and made a single arc in the beta-globulin region with rabbit antiserums against guinea pig serum on immunoelectrophoresis. This factor seemed to be antigenically different from immunoglobulin G (IgG) by immunodiffusion and immunoadsorption. On the other hand, the chemotactic activity of MCFS-2 was adsorbed by neither anti-IgG nor anti MCFS-1 and that of euglobulin fraction was partially adsorbed by anti-IgG. These indicate the presence of at least three types of antigenically different chemotactic factors for macrophages in the extracts of delayed hypersensitivity skin lesions.

Animals↗
PubMed1977

Dentofacial changes produced by extraoral forward force in the Macaca irus.

Eleven Macaca irus monkeys with a mixed or a permanent dentition were used in a study of the possible effects of extraoral forward force on the growth of the dentofacial skeleton. An intermittent forward force of 300 Gm. per side was applied, and the effects were analyzed by means of model casts, cephalometric radiographs, tetracycline bone marking, microradiographs, and histologic preparations. The results obtained were as follows: 1. An extraoral forward force caused significant changes in the circum-maxillary sutures and the maxillary tuberosity. 2. It was found that intermittent force of 300 Gm. per side resulted in desirable reactions in the sutures in young monkeys. 3. It was suggested that reactions in the suture might occur as a result of (1) an opening of the suture, (2) stretching of sutural connective tissue fibers, (3) new bone deposition along the stretched fibers, and (4) homeostasis which maintained the sutural width. 4. The maxillary complex showed a positional change with a little counterclockwise rotation. 5. A local reaction was observed histologically in the adult, but the degree was less than that seen in the young monkey. 6. It was considered that a forward movement of the maxillary complex would readily be accomplished by increasing sutural activity as early as possible. 7. Clinically, it was assumed that the hooks attached to the intraoral appliance should be placed as far frontally as possible. The present study seemed to indicate that forward movement of the maxillary complex would be performed with an extraoral anterior-pull appliance. Further investigation should be designed to evaluate a possible skeletal relapse after an orthopedic approach.

Aging↗
PubMed1977

The chemical mediation of delayed hypersensitivity skin reactions. I. Purification of a macrophage-chemotactic factor from bovien gamma-globulin-induced skin reactions in guinea pigs.

A macrophage-chemotactic factor (MCFS) was extracted in the pseudoglobulin fraction from delayed hypersensitivity skin lesions induced by bovine gamma-globulin in guinea pigs. Its chemotactic activity was estimated by a modification of Boyden's method using Nuclepore filter. After chromatography of the protein fraction using Sephadex G-50 and DEAE-cellulose, in that order, two chemotactic fractions were obtained. The chemotactic factor with stronger activity (MCFS-1) was further highly purified (488-fold) by chromatography on CM-Sephadex. This factor migrated in a single band on acrylamide disc gel electrophoresis and was found to be a protein that was free of nucleic acid. Gel filtration showed that its molecular weight was similar to that of IgG. Its chemotactic activity was heat labile. Intradermal injection of this factor into normal guinea pigs induced a pronounced mononuclear cell emigration from venules. These findings are pertinent to understanding macrophage reaction in the delayed hypersensitivity reactions. Am J Pathol 87:359-374, 1977).

Animals↗
PubMed1971

Radiation, Infection, and Macrophage Function IV. Effect of Radiation on the Proliferative Abilities of Mononuclear Phagocytes in Tuberculous Lesions of Rabbits.

Rabbits were irradiated with 400 to 600 rads 2 to 3 days before they were infected with BCG or with virulent tubercle bacilli. Biopsies were periodically removed from the resulting lesions and incubated for 1 hr with (3)H-thymidine in vitro under hyperbaric oxygen. Twelve to 16 days after radiation there was a reduction in the percentage of mononuclear cells (macrophages and some lymphocytes) that had incorporated (3)H-thymidine in the lesions. At this time, the lesions of the irradiated group were smaller than those of controls. These results can be explained by the reduction in the number of new mononuclear cells that entered the lesions of the irradiated group and support the tenet that local mononuclear cell division occurs mainly in cells that have recently emigrated from the blood stream. An alternate, but less likely, explanation of these results would be that radiation caused the bone marrow to release a higher percentage of "defective" mononuclear cells that were unable to divide, i.e., incorporate (3)H-thymidine, in the lesions. The reduction produced by radiation in both local cell infiltration and local cell division would decrease the number of macrophages available to control the tuberculous infection in the host.

Journal Article↗