These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Human T helper cell differentiation is regulated by the combined action of cytokines and accessory cell-dependent costimulatory signals.
    Author: Palmer EM, van Seventer GA.
    Journal: J Immunol; 1997 Mar 15; 158(6):2654-62. PubMed ID: 9058798.
    Abstract:
    We have developed an in vitro differentiation model for human Th cells to study the role of cytokines and accessory cell-dependent costimulatory signals in this process. Peripheral blood-derived CD4+ "naive" (CD45RA+ RO-) T cells were stimulated in weekly intervals with immobilized anti-CD3 mAb, accessory cells, and exogenous cytokines, and were analyzed for cytokine secretion pattern. With the B cell line JY (B7-1+ B7-2+), as source of accessory cells, we could generate distinct Th subsets. Coculture with the combination of recombinant human (rh) IL-1beta and rhIL-6 gave rise to Th0-like cells, which secreted low levels of IFN-gamma and IL-5. The addition of rhIL-12 led to the generation of Th1-like cells, which secreted high levels of IL-2, IFN-gamma, TNF-alpha, and upon multiple stimulations, significant levels of IL-10. The presence of rhIL-4 induced Th2-like cells that secreted high levels of IL-5 and IL-13, but undetectable levels of IL-4. Only after stimulation with phorbol ester and calcium ionophore could these Th2-like cells be induced to secrete significant levels of IL-4, indicating distinct stimulatory requirements for the induction of IL-5 and IL-13 compared with IL-4. The B7-1-negative monocytic cell line U937 could only provide accessory cell-dependent costimulatory signals for the generation of Th1-like cells, while B7-1-transfected U937 cells acquired the capacity to provide costimulation for the generation of Th2-like cells. These results indicate a differential dependence on CD28-mediated costimulation for the generation of human Th1-like and Th2-like cells.
    [Abstract] [Full Text] [Related] [New Search]