Different Sensitivities to Hydrocortisone of Natural Killer Cell Activity and Hybrid Resistance to Parental Marrow Grafts

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Abstract
Natural killer cells and cells mediating F1 anti-parent responses in vivo and in vitro differ in their sensitivity to hydrocortisone acetate. NK cell activity is sharply decreased after in vivo drug administration whereas induction of specific F1 anti-parent or anti-allogeneic cytotoxicity and hybrid resistance to parental marrow grafts are not impaired. Because of several other properties shared by the NK and anti-Hh host reactivities, it is still suggested that the effector cells are generated from a single differentiation pathway, but that they differ with respect to specificity and sensitivity to hydrocortisone.

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