Abstract
Fawn-hooded (FH) rats were shown to lack the genetically conditioned defect of natural killer (NK) activity hypothesized to be present by analogy with the Chediak-Higashi syndrome (CHS) in mice and human beings. In 4-h 51Cr release assays, splenic NK cells from FH rats killed YAC-1, RL male l and G1-TC tumor targets without deficiency based upon comparison with cells from BD-IV, BD-IX and NBR inbred rat strains. Progeny of BD X FH F1 rats backcrossed to FH failed to reveal a correlation of reduced NK activity and dilute coat color. From these, and other data presented, it is concluded that despite similarities in coat color dilution and platelet storage pool deficiency. FH rats do not closely resemble CHS mice or human beings in having deficient NK activity and cannot be considered the rat homolog of the CHS.
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