Summary
Immunoreactivities of four subtypes of adenylyl cyclase (AC) (types I, II, IV and V/VI), and basal, forskolin- and Mn2+-stimulated AC activities with or without calcium and calmodulin (Ca2+/CaM) were estimated in parietal cortex membranes from cases with dementia of the Alzheimer type (DAT) and age-matched controls. Immunoreactivities of AC-I and AC-II were significantly decreased, but those of AC-IV and AC-V/VI did not change in DAT brains. There was a significant correlation of AC-I immunoreactivity with Ca2+/CaM-sensitive AC activity, but not with the Ca2+/CaM-insensitive activity. Ca2+/CaM-sensitive AC activity was significantly lower in DAT than in the control, indicating that impairment of Ca2+/CaM-sensitive AC-I is clearly involved in the pathophysiology of DAT.
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Yamamoto, M., Ozawa, H., Saito, T. et al. Ca2+/CaM-sensitive adenylyl cyclase activity is decreased in the Alzheimer's brain: Possible relation to type I adenylyl cyclase. J. Neural Transmission 104, 721–732 (1997). https://doi.org/10.1007/BF01291889
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DOI: https://doi.org/10.1007/BF01291889