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Choline acetyltxansferase (CUT) activity Wers in right and left human temporal lobes

Department of Neurology (Drs. Amaducci and Sorbi), University of Florence, Florence, and the Department of Neurology (Drs. Albanese and Gainotti), Universita Cattolica del S. Cuore, Rome, Italy.

Choline acetyltransferase (ChAT) activity was studied in different areas and in sequential sections of the cortical layers in the first temporal gyrus of left and right hemispheres of four human brains. The ChAT activity values obtained in all the samples from left hemisphere were significantly higher than in the right hemisphere. Furthermore, the study of ChAT activity in the cortical layers in Brodmann area 22 shows a greater left prevalence of enzymatic activity in cortical layers I1 and IV. The biochemical data seem to suggest a possible morphologic and/or functional difference between the two hemispheres.

Address correspondence and reprint requests to Dr. Amaducci, Department of Neurology, University of Florence, Florence, Italy.

This study was supported by Grant No. 79.01817 from C.N.R. (Rome, Italy).

Accepted for publication December 3, 1980.

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