STUDIES OF TUBERCLE BACILLUS-HISTIOCYTE RELATIONSHIPS

Abstract
The mechanism of cellular resistance against virulent tubercle bacilli was analyzed. Immune rabbit histiocytes contained a substance capable of inducing cellular resistance in normal rabbits. Fractionation of these histiocytes indicated that the nuclear and mitochondrial fractions were inactive whereas the microsomal and ribosomal fractions were active. The ribonucleic acid nature of the active component in the ribosomes was indicated by the extraction of an active RNA from ribosomes and by inactivation of the ribosomal RNA with ribonuclease but not with deoxyribonuclease or trypsin.