Table 1.

Hippocampal concentrations of PKC isoforms in soluble and particulate subcellular fractions of young and aged rats

PKC isoform	Subcellular fraction	Young rats	Aged rats
γ*	Soluble	9.90  ±  0.37	10.70  ±  0.28
	Particulate	8.08  ±  0.60	8.85  ±  0.37
α	Soluble	7.22  ±  0.30	7.10  ±  0.27
	Particulate	5.81  ±  0.44	5.44  ±  0.30
β2	Soluble	5.68  ±  0.39	6.13  ±  0.34
	Particulate	4.66  ±  0.48	4.73  ±  0.38

Values represent the mean ± SEM of integrated optical density and area measures of individual samples immunostained for PKC isoforms and calibrated to standards in μg of total protein (see Fig. 1). 

^*Aged rats had higher overall concentrations of PKCγ than young rats, but the age x subcellular fraction interaction was not significant.