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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Graphic representation of the distribution of acetylcholinesterase in cat dorsal root ganglion neurons.

Acetylcholinesterase (AChE) activity of primary sensory neurons of the cat has been quantitated and correlated with cell size. Dorsal root ganglia of the fourth and fifth thoracic spinal levels were studied. Frozen longitudinal and cross-sections were collected serially and stained with Cresyl Violet for total cell counts of the ganglia on the left; the average count was 3375 cells. Ganglia from the right were stained for AChE after the method of Karnovsky & Roots (1964) as modified by El Badawi & Schenk (1967), and counterstained with Haematoxylin. Cells were counted in every fourth section and the diameter of each was recorded. AChE-positive cells were classified as brown (B1, B2, B3) and AChE-negative ones as blue (BL). An inverse correlation exists between cell size and AChE activity. High activity was demonstrated in 29% of the cells (B1), moderate activity in 52% (B2), minimal activity in 15% (B3) and 4% were classified as AChE-negative (BL). Small cells with high activity were centrally located in the ganglia whereas large AChE-negative cells were peripherally distributed. Chi-Square analysis revealed that the size of the cell was not independent of the enzyme colour category.[1]


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