All cloned variants of RT1-U functions as ligands for Ly49s4/-i4/-i3.
(A) Amino acid sequence of the different allelic variants of
RT1-U used in this study, i.e. Un (corresponds with CE16 in the
n haplotype), Uav1, Ulv1, and
Uc/d and RT1-Cl. (B) Testing of the
response of Ly49s4/-i4/-i3 reporter cells against YB2/0 stimulator cells stably
transfected with the different RT1-U alleles. As negative and positive controls
are shown reporters incubated with wild-type YB2/0 cells (YB) or with Ionomycin
(io.) (C) Cytolytic activity of DAR13+ IL-2
activated NK cells generated from spleens of normal PVG and F344 rats was tested
against Con A lymphoblast targets from the MHC congenic strains PVG.1N
(n), PVG.LV1 (lv1), and PVG
(c), in the presence of blocking quantities of mAb DAR13
(+) or the isotype control mAb FLY5 (-). Results are only shown for the
effector:target cell ratio of 50:1. Data are representative of at least 3
independent experiments, *p<0.01.