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Biomedical subjects

I Bursuker

Publications and source records attributed to I Bursuker.

35 records · Page 2Linked to original sources
PubMed1984

Generation and decay of the immune response to a progressive fibrosarcoma. II. Failure to demonstrate postexcision immunity after the onset of T cell-mediated suppression of immunity.

This study shows that surgical removal of the meth A fibrosarcoma from its semisyngeneic host fails to result in postexcision immunity to growth of a tumor implant unless the host already has acquired a mechanism of concomitant immunity to growth of an implant. Therefore, tumor excision does not cause immunity to be generated but preserves a mechanism of concomitant immunity that already exists and which otherwise would eventually undergo down-regulation under the influence of suppressor T cells. Removal of the tumor after it has grown large enough to cause the T cell-mediated suppression of concomitant immunity does not result in the reemergence of immunity. Instead, the host remains unable to generate concomitant immunity to a second tumor for a long period of time and retains, for at least 31 d, suppressor T cells able to passively transfer suppression to appropriate recipients. Like the suppressor T cells responsible for active suppression of concomitant immunity, the suppressor T cells responsible for "memory" suppression are of the Ly-1+2- phenotype. The results indicate that progressive tumor growth results in a state of immunological tolerance of tumor-specific, transplantation antigens that can persist in the apparent absence of tumor antigens.

Animals↗
PubMed1983

On the origin of macrophage heterogeneity: a hypothesis.

Data are summarized suggesting an inherent heterogeneity of bone marrow macrophage precursor cells. The possible relationship of this heterogeneity with the functional heterogeneity of blood monocytes and tissue macrophages under normal conditions and at an inflammatory site is discussed. A hypothesis suggesting that the bone marrow compartment is involved in the generation of macrophage heterogeneity is presented.

5'-Nucleotidase↗
PubMed1982

Beta-galactosidase--an indicator of the maturational stage of mouse and human mononuclear phagocytes.

Resident, elicited, and activated mouse peritoneal macrophages exhibit a differential expression of the activity of the enzyme beta-galactosidase; freshly harvested resident macrophages express a remarkably high activity whereas the latter two populations are almost void of enzymic activity. During in vitro cultivation there is an enhancement in the level of the enzyme in the three populations, and a significant proportion of both thioglycollate-elicited and Corynebacterium parvum-activated macrophages acquire beta-galactosidase activity. Cells within in vitro differentiated bone marrow-derived mononuclear phagocyte colonies are heterogeneous with respect to expression of beta-galactosidase activity. The percentage of cells expressing medium to intense enzymic activity is augmented with time in culture. Essentially the same pattern is observed in colonies differentiated from bone marrows of mice bearing acute or chronic inflammation. Freshly isolated human peripheral blood monocytes are essentially void of detectable beta-galactosidase activity. Eighty to ninety percent of the monocytes acquire medium to intense activity during a 7-day cultivation period. The data support the suggestion that beta-galactosidase expression in mononuclear phagocytes is a correlate of their maturational stage both in vivo and in vitro and does not reflect the state of elicitation or activation of these cells.

Animals↗
PubMed1982

The regulation of bone marrow-derived mononuclear phagocyte differentiation and mobilization in syngeneic and allogeneic YAC-lymphoma-bearing mice.

YAC-lymphoma inoculation (ip) into syngeneic A/J mice results in a massive in situ proliferation of the lymphoma cells, with non-significant increases in the peritoneal macrophage population, and also in a remarkable and progressive increase in the bone marrow precursor cells forming both macrophage and fibroblastoid colonies in vitro. In the allogeneic situation (BALB/c mice), YAC-lymphoma cells proliferate to a limited extent before tumour regression. These processes (i.e. proliferation and regression) were accompanied by a progressive increase in the peritoneal macrophage population, which declined to normal after tumour regression. Macrophages accumulating at the regression stage exhibited in vitro cytolytic activity towards YAC-lymphoma cells and cytostatic activity towards unrelated cells. No correlation was observed between the limited asynchronous increase in the bone marrow level of precursor cells for in vitro differentiating macrophage and fibroblastoid colonies, on one hand, and macrophage accumulation at the tumour site in BALB/c mice on the other. Conditioned media from in vitro proliferating YAC-lymphoma cells exhibited high colony-stimulating activity for macrophage colony formation in vitro. Bone marrow cells taken from YAC-lymphoma inoculated A/J mice expressed potent tumorogenic potential at early stages after tumour inoculation. At day 2 after tumour inoculation the bone marrow cells were already tumorogenic and concomitantly expressed augmented levels of macrophage and fibroblastoid colony-forming capacity. The results indicate an inter-relationship between tumour growth and mononuclear phagocyte differentiation and proliferation.

Animals↗
PubMed1980

Functional tuftsin binding sites on macrophage-like tumor line P388D1 and on bone marrow cells differentiated in vitro into mononuclear phagocytes.

Mouse bone marrow cells, differentiated in vitro into mononuclear phagocytes (BMDMP), posess functional tuftsin binding sites, i.e. both tuftsin binding capacity and augmented phagocytic response related to tuftsin binding. The binding capacity of BMDMP was shown to be higher by a factor of about three than that exhibited by mouse monocytes and by normal, thioglycollate and Corynebacterium parvum induced peritoneal macrophages. The relatively high binding capacity did not depend on experimental variations in the in vitro culture of these populations (i.e. length of in vitro cultivation, source of serum or presence of conditioned medium leading to cell proliferation). The macrophage-like line, P388D1, was also shown to possess functional tuftsin binding sites and its binding capacity was comparable to that of the peritoneal macrophage populations.

Animals↗
PubMed1978

Differential scanning calorimetry of dipalmitoyl phosphatidylcholine analogues and of their interaction products with basic polypeptides.

The thermotropic behaviour of dipalmitoyl phosphatidylcholine analogues with a varying number (n) of CH2 groups between the phosphate and the quaternary ammonium has been investigated. The temperature (Tm) and the enthalpy (deltaH) of the phase transition are non-monotonous functions of the number of CH2 groups. Tm oscillates between 40 and 45 degrees C and deltaH between 7 and 13 kcal/mol for a variation of n between 2 and 11. It is concluded that the hydrocarbon chains in the head groups do not penetrate the hydrocarbon region and do not contribute directly to the melting of the acyl chains. It is suggested that their length may affect the critical balance between the attractive and the repulsive forces within the bidimensional lattice of the head groups. Copolypeptides of lysine with phenylalanine do not appreciably affect the Tm but have a pronounced effect on deltaH of the lipid phase transition, which depends strongly on the ratio of the two amino acids in the polypeptide. The effect of copolypeptide of any defined composition on deltaH is also a non-monotonous function of the number of CH2 groups in the phosphatidylcholine head group, but it does not parallel completely the oscilations in the Tm and deltaH of the pure lipids.

Calorimetry, Differential Scanning↗
PubMed1978

Differential scanning calorimetry of rat liver mitochondria.

Differential scanning calorimetry was employed for studying rat liver mitochondria and extracted mitochondrial lipids. Endothermic transition in the range 15--40 degrees C was detected for the whole mitochondria and between 10--20 degrees C for the extracted lipids.

Animals↗
PubMed1977

Differential scanning calorimetry and enzymic activity of rat liver microsomes in the presence and absence of delta1-tetrahydrocannabinol.

The thermal transitions of rat liver microsomes and isolated lipids were investigated by using differential scanning calorimetry. Endothermic transitions at approximately-5 degrees C and between approximately18 degrees and 40 degrees C were detected in the membranes and at approximately-10 degrees C and between approximately 10 degress and 20 degrees C in the extracted lipids. Interaction with delta1-tetrahydrocannabinol of microsomal membranes and of extracted lipids influences the thermotrophic behaviour as revealed by differential scanning calorimetry and eliminates the break in the Arrhenius plot of the enzymic activity of O-demethylase.

Animals↗
PubMed1977

Fluidity difference of membrane lipids in human normal and leukemic lymphocytes as controlled by serum components.

Lymphocytes isolated from the peripheral blood of patients with chronic lymphatic leukemia and from normal healthy donors were analyzed for fluidity of membrane lipids. The degree of lipid fluidity in normal and leukemic lymphocytes was quantitatively monitored by a method based on fluorescence polarization analysis of a fluorescent probe that is embedded in lipid regions of cellular membrances. The present studies were performed on lymphocytes isolated from 26 blood samples from 16 patients with chronic lymphatic leukemia and 36 blood samples from 36 normal health donors. A signifcant increase in the degree of fluidity of membrane lipids was found in lymphocytes isolated from leukemic patients as compared to that found for lymphocytes isolated from healthy donors. In vitro incubation of leukemic lymphocytes in normal serum resulted in a decrease in the fluidity of cellular membranes, whereas incubation of normal lymphocytes in leukemic serum resulted in an increase in the fluidity of membrane lipids. These observations suggest that normal and leukemic lymphocytes can be quantitatively characterized by monitoring degree of fluidity of cellular membrane lipids and that the fluidity difference between normal and leukemic lymphocytes is controlled by components in the blood serum.

Adult↗
PubMedDate not supplied

YAC-Lymphoma bearing induces functional changes in bone marrow derived mononuclear phagocytes.

Bone marrow derived mononuclear phagocytes (BMDMP) differentiated in vitro from bone marrows of YAC-lymphoma bearing mice and Corynebacterium parvum (CP)-inflamed mice shown to differ in several functional parameters from those derived from bone marrows of control mice. The former 2 BMDMP populations expressed: (a) an increased level of acid phosphatase activity; (b) an increased degree of zymosan-induced chemiluminescence reaction; (c) a lower sensitivity of the proliferative capacity to prostaglandin E2 (PGE2), as compared to the BMDMP population from normal mice. These data suggest that YAC-lymphoma bearing in A/J mice induces similarly to inflammatory stimuli changes in the functional capacity of bone marrow mononuclear phagocyte precursor cells.

Acid Phosphatase↗