We present evidence about the functional activity of factors produced by cortisol-resistant thymocytes. Experiments in vivo have shown that the administration of the supernatant prepared from cortisol-resistant thymocytes leads to a strong stimulation of endogenous colony formation, significantly prolongs survival of sublethally irradiated mice, increases the rate of restoration of the number of thymocytes in the thymus after sublethal irradiation, and contributes to the recovery of the humoral immune response of nude mice to T-dependent antigens. The results obtained suggest that along with other cytokines, cortisol-resistant thymocytes spontaneously produce a chemotactic factor inducing migration of stem cells from the bone marrow to the periphery.
Download full-text PDF |
Source |
---|
Ontogenez
October 1999
Institute of Carcinogenesis, Russian Academy of Medical Sciences, Moscow, Russia.
Biull Eksp Biol Med
April 1989
The cortisol-resistant PNA+SC- --1+Thy--1+-thymocytes are the target cells for the thymocyte growth factor (THGF), which is produced by the lines of transformed precursors of T-lymphocytes (PTL). These cells have the same properties and markers as the intrathymic PTL. The bone marrow cells do not proliferate in response to THGF but acquire that ability after the influence of thymic hormones, which induce the maturation of PTL.
View Article and Find Full Text PDFMetabolism
March 1989
Department of Clinical Biochemistry, Sunnybrook Medical Centre, University of Toronto, Canada.
We have shown previously that cortisol-sensitive lymphocytes (thymocytes) have a much lower capacity than cortisol-resistant cells to catabolize cortisol and that linoleic acid inhibits the catabolism of cortisol by lymphocytes and modulates the sensitivity of lymphocytes to cortisol. In the present study, we attempted to see whether other fatty acids are inhibitory and if inhibition of cortisol catabolism by lymphocytes indicates a change in resistance of the cells to cortisol. Measuring the effect of fatty acids on cortisol catabolism by lymphocytes indicated that the polyunsaturated fatty acids, linoleate, arachidonate, and eicosapentaenoic, inhibit cortisol catabolism by lymphocytes.
View Article and Find Full Text PDFTumour Biol
December 1988
Department of Clinical Biochemistry, Sunnybrook Medical Centre, University of Toronto, Ont., Canada.
We have shown previously that cortisol-sensitive lymphocytes (thymocytes) have a much lower capacity than cortisol-resistant cells to catabolize cortisol. We have also shown that sera of cancer patients (CPS) possess ethanol-extractable substance(s) which can inhibit the catabolism of cortisol by lymphocytes (CCL). Recently, we noted that unsaturated fatty acids can both inhibit CCL and modulate the sensitivity of lymphocytes to cortisol.
View Article and Find Full Text PDFWe have shown previously that cortisol-sensitive lymphocytes (thymocytes) have a much lower capacity than cortisol-resistant cells to catabolize cortisol. In the present study, we attempt to demonstrate that inhibition of cortisol catabolism may make cortisol-resistant lymphocytes vulnerable to the steroid. Linoleic acid, which has the capacity to inhibit the catabolism of cortisol by lymphocytes, was used for this purpose.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!