Changes of Histone Hi Subtypes With Aging in Strains of Mice That Possess Different Immunological Characteristics

Abstract
Relative proportions of histone H1 proteins were determined for brain, heart, liver, and spleen for five strains of mice as a function of age. The strains examined were SJL/J AND MRL/MPJ-LPR/LPR which develop early resistance to tolerance and A/J, C57Bl/6J and MRL/MPJ-+ /+ which do not. Heart, brain, and liver of most of these strains displayed significant relative increases in histone H1° and coordinate decreases in H1I or HII with age. In contrast, spleen cells, which are highly proliferative, contained little or no histone H1°. Only spleen cells from a mouse strain with a predisposition to lupus erythematosus, MRL/ MPJ-LPR/LPR, displayed any significant H1 changes