Na. Ayers et al., CIRCADIAN VARIATION OF NITRIC-OXIDE SYNTHASE ACTIVITY AND CYTOSOLIC PROTEIN-LEVELS IN RAT-BRAIN, Brain research, 707(1), 1996, pp. 127-130
The circadian variation of nitric oxide synthase (NOS) activity and cy
tosolic protein content in the cerebellum, brainstem, hypothalamus, hi
ppocampus, and the remainder of the brain were studied in rats. Both N
OS activity and cytosolic protein concentrations were the highest duri
ng the dark period and lowest in the light period. Hypothalamic NOS ac
tivity exhibited the most pronounced change in activity with time incr
easing by similar to 120% from mid-light to mid-dark.