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Biomedical subjects

R H Kelly

Publications and source records attributed to R H Kelly.

86 records · Page 5Linked to original sources
PubMed1978

Lymphocyte migratory pathways in adjuvant disease. I. Distribution of 51Cr-labeled thoracic duct lymph-borne.

Evidence for selective extravasation of thoracic duct lymph-borne cells, derived from rats with adjuvant disease, within joints of normal or adjuvant arthritic recipients was sough by adoptive transfer of radiolabeled cells. Control studies were carried out in parallel using thoracic ducts cells from normal donors. No increased homing of lymph-borne cells to inflamed portions of the limbs was detected when cells from adjuvant arthritic donors were compared with those of normal controls. Inflammatory changes, ie, adjuvant-induced disease, in the recipient produced a significant nonspecific enhancement of extravasation; cells from normal and adjuvant arthritic donors responded equally well. One difference in migratory behavior between lymph-borne cells from adjuvant arthritic and normal animals was the increased ability of the former to localize within certain lymph nodes. A possible association between this traffic and the development of chronic inflammatory processes within joints is discussed.

Animals↗
PubMed1978

A comparison of the hematogenous cell infiltrate evoked by lymphokine injection with that of delayed hypersensitivity reactions.

Lymphokine preparations of high potency obtained by in vitro assay were employed in vivo to determine whether they could produce inflammatory responses showing a cellular infiltrate that qualitatively or quantitatively resembled responses of delayed hypersensitivity. Hematogenous cell infiltrates in guinea pig skin were characterized in terms of the number and types of participating cells following intradermal injection of either lymphokines or an antigen (PPD) to which the animals exhibited delayed hypersensitivity. The dose of lymphokine or PPD per skin test site was selected on the basis of comparable ability to enhance vascular permeability. Delayed hypersensitivity responses showed, as expected, a persistent mononuclear cell exudate both in dermis and subcutis, but most notable in the dermis, during the 24 hours following antigen injection. In contrast, the response to lymphokine over the same period was characteristically neutrophilic and principally in the subcutis. There was no pronounced mononuclear cell infiltrate at any time throughout the reaction to lymphokine. It is concluded that preformed lymphokine produces a pattern of increased vascular permeability appropriate to a mediator of delayed hypersensitivity reactions, provided there is sustained secretion of this material. The ability of lymphokine to cause carbon labeling of dermal capillaries is also pertinent to a mediator of delayed hypersensitivity. The absence of significant mononuclear cell accumulation suggests that the in vitro chemotactic activity of lymphokine toward mononuclear cells may be more important for retention of mononuclear cells in the extravascular connective tissue space than for their selective accumulation.

Animals↗
PubMed1975

Functional anatomy of lymph nodes. I. The paracortical cords.

Histological alterations in the paracortical zones of rabbit lymph nodes were produced by the intravenous injection of the acridine dye euchrysin. The paracortical parenchyma was reduced to narrow bands of lymphoid tissue which cuffed and outlined the venules against a distended and cell-filled sinus system. These perivenous lymphocyte cuffs, termed the paracortical cords, represented the basic anatomical unit of the thymus-dependent paracortical area. Both the paracortical cords and sinuses are cell traffic pathways, but during stages of antigen-induced lymphocyte trapping the cords retain more cells than do the sinuses. Proliferation of T cells and differentiation of B cells both occur within these cords in a microenvironment conductive to cellular cooperation.

Acridines↗
PubMed1975

Accelerated cytodifferentiation of antibody-secreting cells in guinea-pig lymph nodes stimulated by sheep erythrocytes and lymphokines.

Lymphokines, produced in response to structurally unrelated antigens, altered the course of a primary anti-sheep erythrocyte plaque-forming cell response within the regional lymph nodes of normal guinea-pigs. Intralymphatic injection of a small dose of lymphokines (0-5-8 mug) 1 day after antigen priming accelerated the rate of indirect plaque-forming cell cytodifferentiation between the 5th and the 9th days of the response. This effect was not related to changes in the level of antigen trapping by lymph node macrophages, but the lymphocyte mitogenic activity may have been important for the response since there was a significant increase in [3H]thymidine incorporation within the lymphokine-treated nodes on the 3rd day following immunization.

Animals↗
PubMedDate not supplied

Diet-induced reduction in serum lipoproteins stimulates cell proliferation in weanling rats.

Male weanling Wistar rats were fed a 4% cholestyramine diet and used as a model to demonstrate that a reduction in serum low density lipoproteins stimulates de novo cholesterogenesis leading to DNA synthesis and cell proliferation. Feeding this diet resulted in a decrease in serum very low density lipoproteins and low density lipoproteins, an increase in high density lipoproteins and an increase in de novo cholesterogenesis in liver, thymus, spleen, pancreas, kidney and lung. DNA synthesis increased only in the thymus and spleen. Histological examination of spleen, thymus and lymph nodes showed an increased number of immature cells and enhanced mitotic activity. These results suggest that a marked reduction in serum low density lipoproteins stimulates de novo cholesterogenesis, leading to enhanced DNA synthesis and cell proliferation.

Animals↗
PubMedDate not supplied

Somatic complaints among pregnant women cared for in obstetrics: normal pregnancy or depressive and anxiety symptom amplification revisited?

Despite the extensive research documenting the significance of medically unexplained somatic symptoms in primary care patients, few studies have examined somatic symptoms as a predictor of depressive and anxiety disorders among pregnant women cared for in Obstetrics. We utilized the Primary Care Evaluation of Mental Disorders Patient Health Questionnaire (PHQ) to assess current depressive and anxiety disorders and self-reported somatic symptoms among 186 women receiving prenatal care. We examined the bivariate relationships between depressive and anxiety disorders and mean number of somatic symptoms. Linear regression analyses assessed the unique association between maternal depression, anxiety and somatic symptoms, while controlling for selected demographics and maternal medical risk. Twenty three percent (N=43) of women met screening criteria for depressive and/or anxiety disorders. Women with depression and/or anxiety were significantly more likely to report somatic symptoms (mean=7.1, SD=2.6) compared to women without depression or anxiety (mean=5.0, SD=2.6) [t(df)=4.54(184), P<.001]. This association persisted in multivariate models. Our findings suggest that antenatal depressive and anxiety disorders are associated with an amplification of physical symptoms of pregnancy. Eliciting and tracking somatic symptoms during prenatal visits could potentially improve detection of depressive and anxiety disorders in the obstetrical sector.

Adult↗
PubMedDate not supplied

Early recipient-donor switch of the complement type after liver xenotransplantation.

Liver transplantation is an immunological peculiarity with respect to the resistance of the graft to humoral rejection. We undertook a kinetic analysis of molecules involved in humoral rejection for a period of one week following xenografting in the hamster to rat model system. A complement-dependent lymphocytotoxicity test (CDC) was used to detect anti-donor antibodies in the recipient rats. Complement was studied by two methods. Function of the classical complement pathway was evaluated with a hemolytic assay, and C3 was measured by radial immunodiffusion. Conversion of the major plasma proteins from recipient to donor profile was studied by zone electrophoresis on agarose. CDC showed antibody titers rose during the first week post-transplantation, and they were of complement-activating isotypes. Zone electrophoresis showed almost complete replacement of rat C3 by hamster C3 within 72 hours. Hemolytic assay of complement on day 6 post-transplant showed serum of the xenograft recipients could lyse erythrocytes sensitized with rat antibody with 80% of efficiency of normal rat serum. Our data show the effector molecules for humoral rejection, rat antibodies with anti-hamster specificity and a functional complement cascade, were present within the first week following transplantation. Rapid conversion of serum complement to hamster proteins maintains compatibility with the species-specific membrane inhibitors of complement activation expressed by the xenografted hepatocytes, and could limit complement-mediated damage.

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