We studied the ability of phytohemagglutinin (PHA) and two anti-T-cell monoclonal antibodies, OKT3 and Pan T2, to induce interleukin-2 (IL2) production and proliferation in peripheral blood lymphocytes (PBL) from 14 patients with combined varied immunodeficiency (CVI). The median values of endogenous IL2 produced by mitogen-stimulated PBL was significantly lower in patients than controls irrespective of the mitogen used. The patients, taken as a group, had a significantly decreased in vitro PBL response to mitogen stimulation when compared to controls. With the addition of a highly purified human IL2 preparation, the proliferative response in the majority of patients was significantly improved with all mitogens. Three patient groups could be distinguished: Group A (3/14) had full restoration of proliferative response with the addition of IL2, Group B (5/14) had partial restoration, and Group C (6/14) had no significant response. The monoclonal antibody, Pan T2, recognized a T-cell proliferative defect in 5 of 14 patients which neither PHA nor OKT3 recognized. This was not significantly corrected by the addition of IL2. This T-cell proliferative defect correlated with the lack of B-cell proliferation and immunoglobulin production in response to B-cell mitogens in three-fourths of the patients assayed. These data show that CVI patients are a heterogeneous group but have in common a decreased in vitro production of IL2 resulting in a proliferative defect which is correctable at least in part, in vitro, in the majority by the addition of purified IL2.
We studied the ability of phytohemagglutinin (PHA) and two anti-T-cell monoclonal antibodies OKT3 and Pan T2, to induce proliferation and interleukin 2 (IL2) production in peripheral blood lymphocytes (PBL) from 21 homosexual patients: 12 with Kaposi's sarcoma (KS), 4 with reactive lymphadenopathy, and 5 with opportunistic infections. All patients with KS and opportunistic infections had significantly lower mitogen-stimulated DNA synthesis, as compared to the controls, irrespective of the mitogen used (P less than 0.01). The patients with lymphadenopathy exhibited significantly lower responses only in the OKT3 assay as compared to normals (P = 0.009). The production of endogenous IL2 was significantly lower in PBL cultures from patients with KS and with opportunistic infections, irrespective of the mitogen used, as compared to healthy male controls, and also significantly lower in the Pan T2-stimulated cultures from patients with lymphadenopathy. The addition of highly purified IL2 was able to restore partially lymphocyte proliferation in vitro in the presence of these mitogens in all patients. Our studies demonstrate (1) that male homosexuals even without clinical manifestations of immunodeficiency frequently exhibit a proliferative T-cell defect when anti-T-cell monoclonal antibodies rather than PHA are used as mitogens, (2) that this proliferative defect is associated with defective IL2 production, and (3) that this defect is at least in part correctable in vitro by highly purified IL2.
Interleukin 2 (IL-2), produced with and without co-stimulation by the Burkitt's lymphoma line Daudi, was purified 37,000-fold to apparent homogeneity from lymphocyte conditioned medium by (NH4)2SO4 precipitation, DEAE-cellulose ion-exchange chromatography, gel filtration, and chromatography on blue agarose and on Procion-red agarose. The purified IL-2 showed a 10(6) U/mg protein sp act. IL-2 produced in the absence of Daudi cells had a mol wt of 26,000 as measured by gel filtration and an isoelectric point of 6.7. This IL-2 showed a 16,000 and 17,000 mol wt in sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). IL-2, produced in the presence of Daudi cells (10(6)/ml), showed a mol wt of approximately 14,000, as measured by both gel filtration and SDS-PAGE, and an isoelectric point of 8.1. The purified IL-2 lacked detectable interferon (alpha and gamma), granulocyte-macrophage colony-stimulating factor, B cell growth factor, T cell-replacing factor, and thymocyte-differentiating activity and was free of any contaminating proteins as judged by silver staining in SDS-PAGE. All three molecular forms of IL-2 were biologically active at concentrations of 10(-11) - 10(-10) M, supporting the growth of human and murine cytotoxic T cell lines.
Rats were starved for seven days and the effects on corticotrophin releasing factor (CRF) content in the stalk median eminence (SME), corticotrophin content in the anterior pituitary gland (AP), basal plasma corticosterone response to ethyl ether stress were determined. The weight changes in the adrenal and anterior pituitary glands were also studied. When compared to the control group, starvation resulted in a significant increase in stored GRF in the SME. There was a decrease in the corticotrophin content in the AP during starvation but the differences between the starved and the control group were not statistically significant. Pre-and post-stress plasma levels of corticosterone were significantly increased in the starved animals. The weights of the adrenals and of the anterior pituitary glands were significantly increased in the starved animals, when calculated per 100 g body weight. The absolute weight of the adrenals was not significantly increased in the starved animals. There was a significant decrease in the absolute weight of the AP.Changes in the content of the various neurohormones in the hypothalamus have been observed under various physiological conditions. The level of the stored LH-releasing factor changes with the oestrous cycle (Ramirez Se Sawyer 1965; Chowers Sc McCann 1965), and starvation causes a decrease in the rate of
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