PubMed Health⌕ Search

Biomedical subjects

J Jaroszewski

Publications and source records attributed to J Jaroszewski.

At least 37 records · Page 2Linked to original sources
PubMed1992

Analysis of thymocytes contacts with other thymic cells.

The study aimed et defining morphological relationships between thymic stroma cells and thymocytes. The studies were conducted on 16-days old Wistar strain rats. The material was routinely processed for ultrastructural examination. On grounds of serial section analysis, types of contacts of 83 thymocytes were established, for each cell total area and areas of contact with other cells were estimated. Employing stereological techniques microarchitecture of individual thymic zones was studied. The results point to a direct influence of thymic stroma cells on thymocytes.

Animals↗
PubMed1990

The coccygeal artery as a route for the administration of drugs into the reproductive tract of cattle.

A simple procedure is described for cannulating the aorta abdominalis of cattle through the coccygeal artery, and for positioning the tip of the cannula close to the origin of the ovarian artery. When noradrenaline was infused through the cannula there was a rapid increase in the concentration of progesterone in the peripheral blood, whereas the intravenous infusion of the same dose of noradrenaline had little effect. The procedure can be used for endocrinological studies of the reproductive organs and avoids the more costly and potentially damaging procedure of implanting cannulae during a laparotomy.

Animals↗
PubMed1989

The effect of stress induced experimental gastric ulcers on enterochromaffin cells and on serotonin and 5-hydroxyindolacetic acid levels in stomach and duodenum of the white rat.

In rats subjected to acute or protracted stress of immobilization, gastric and duodenal mucosae were monitored for presence of ulcers and their enterochromaffin cells were examined, identifying them with the use of anti-serotonin antibodies and PAP technique. In parallel, serotonin and 5-hydroxyindolacetic acid levels in the stomach and duodenum were estimated. Ulcers developed only in the stomach and exclusively in stress-unadapted animals. Development of ulcers was paralleled by enterochromaffin cell degranulation, decrease in serotonin levels, and increase in 5-hydroxyindolacetic levels in both the stomach and the duodenum. Significance of the findings for contemporary hypothesis of gastric ulcers' pathogenesis was discussed.

Animals↗
PubMed1986

PHA responsiveness and adherent cell-lymphocyte interactions in patients with advanced malignant tumors of the ovary prior to treatment and during chemotherapy.

DNA synthesis in cultures of PHA-stimulated blood mononuclear cells from patients with advanced malignant tumors of the ovary before treatment was significantly reduced and responses of lymphocytes alone were, on an average, 40% lower than in control subjects. Adherent cells were found to suppress the PHA response of autologous lymphocytes from 6/12 patients before treatment, 4/18 patients during chemotherapy and only in 2/19 control subjects. The net effects of adherent cell-lymphocyte interactions in autogeneic vs. allogeneic combinations were frequently discordant, which suggests shifts in lymphocyte subpopulations responsive, respectively, to suppressor- and helper-type mediators released by monocytes in patients. PHA responses of mononuclear blood cells from patients after the 1st and 2nd round of chemotherapy were usually higher than the mean in untreated patients, but declined rapidly after subsequent rounds of cytostatic drug treatment and were deeply impaired in a few cured patients examined many months after therapy. Previous radiotherapy appeared to have little effect on the magnitude and patterns of changes of blood mononuclear response to PHA during subsequent chemotherapy.

Adult↗
PubMed1985

Distribution of different cell types within the rat thymus in the neonatal period of life.

This study attempted to define reciprocal positions of cell types within the thymus. Random or non-random contacts between specific cell types were analyzed by means of graph theory. For analysis, thymus blocks were sectioned serially and, then, thymus cells were categorized into types, based on morphological criteria. The distribution of individual cell types within the cortex, cortico-medullary zone and medulla was presented in form of a map. In the analysis, three types of epithelial cell, characteristic of each thymus zone, macrophages, Langerhans-like cells and lymphocytes were found in non-random relations to one another. Moreover, characteristic groups of cells associated with one another were also demonstrated.

Animals↗
PubMed1984

Application of graph theory to analysis of Langerhans cell types on the basis of their cell nuclei ultrastructure.

Studies were performed aimed at estimating similarities and differences in ultrastructure of Langerhans cells of albino mouse epidermis. Graph theory-based analysis of surface and circumference of nucleus cross-section, heterochromatin and interchromatin area permitted to advance a view that Langerhans cells constitute a uniform cell population, as far as morphology of cell nucleus is concerned.

Animals↗
PubMed1978

Cytotoxicity of human peripheral lymphocytes in cell-mediated lympholysis; antibody-dependent cell-mediated lympholysis and natural cytotoxicity assays after mixed lymphocyte culture.

Lymphocytes that have been purified by Ficoll-Hypaque centrifugation lose antibody-dependent and natural cytotoxic activities upon culture in tissue culture medium supplemented with human plasma. However, stimulation of peripheral lymphocytes in the mixed leukocyte culture (MLC) appears to enhance killer (K) and natural killer (NK) activities in addition to generating cytotoxic T ymphocytes. Enhancement of NK and antibody dependent activities appears to correlate with cell division as measured by 3H-thymidine uptake. However, elimination of dividing cells in the MLC by addition of 5-bromodeoxyuridine has no effect on NK and K cells activities. Since this treatment abolishes cell-mediated lympholysis mediated by cytotoxic T lymphocytes, it is a useful probe for determining the relative activities of NK, K, and cytotoxic T lymphocyte effector cells after lymphocyte stimulation.

Antibody-Dependent Cell Cytotoxicity↗
PubMed1978

Proliferation of human lymphocytes by mitogen stimulated cells.

Lymphocytes cultured for three days with PHA or Con A were capable of inducing vigorous proliferation of autologous or allogeneic lymphocytes. Kinetics of the response varied with mitogen dose used for obtaining stimulating cells and with the ratio of stimulating to responder cells. A requirement for viable, mitogen-reactive lymphocytes cultured for at least two days with the mitogen, for their contact with the reacting cells and an absence of significant quantities of mitogen on Con A lymphoblasts examined by electron microscopy demonstrated that a mitogen itself was not responsible for the stimulation. The PHA blast-stimulated lymphocytes were not cytotoxic to PHA blasts nor did they diminish lymphocyte stimulating abilities of PHA blasts in vitro cultures. This indicated that PHA did not induce proliferation of autologous lymphocytes by derivatization of lymphocyte surface.

Cell Cycle↗
PubMed1976

Blast transformation induced by spermatozoa.

Human lymphocytes cultured for 3-8 days in the presence of autologous or allogenic spermatozoa undergo blast transformation. Possible mechanisms of the response are discussed.

Animals↗