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. 1981 Jan;42(1):127–135.

Human post-thymic precursor cells in health and disease. I. Characterization of the autologous rosette-forming T cells as post-thymic precursors.

R Palacios, D Alarcón-Segovia, L Llorente, A Ruíz-Arguelles, E Díaz-Jouanen
PMCID: PMC1458213  PMID: 6970170

Abstract

Human autologous-rosette-forming T cells (Tar cells) have many of the characteristics of post-thymic precursor cells. Thus, they bind to sheep erythrocytes but have neither receptors for the Fc portion of IgG nor for that of IgM. They include a subpopulation that binds peanut agglutinin which suggests that they are immature and, as opposed to T cells with either receptors for the FC portion of IgM (T mu) or of IgG (T gamma), Tar cells adhere to nylon wool, another possible indicator of immaturity, as is their extreme sensitivity to hydrocortisone both in vitro and in vivo. There are more Tar cells in cord blood than in the peripheral blood of young adults and there are more Tar cells in the peripheral blood of young adults than in the peripheral blood of elderly subjects. By co-culturing T mu and B cells, or T mu, or Tar and B cells in the presence of pokeweek mitogen (PWM) we were able to determine that these cells cause feedback inhibition, a function considered characteristic of post-thymic precursors. In co-cultures in which we placed mononuclear cells (MNC) or MNC plus Tar cells, or MNC depleted of Tar cells or MNC depleted of Tar cells plus Tar cells stimulated with PWM, we determined that Tar cells play a role in the generation of suppression thereby confirming that human Tar cells are precursor cells. We also found that Tar cells proliferated and generated T gamma and T mu cells both spontaneously and in greater numbers, under the effect of serum thymic factor.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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