Effect of partial ischemia and axotomy on activities of cholinergic enzymes in lower motor neurons of the dog

Abstract

Activities of choline acetyltransferase (ChAT) and acetylcholinesterase (AChE) in the ventral spinal cord, ventral spinal roots and in the central and peripheral stumps of the sciatic nerve transected under conditions of partial ischemia (produced by aortic ligation just below the renal arteries) were compared to those obtained under intact blood supply in time intervals 5, 10, or 15 days after surgery. The significant increase of ChAT activity in the central part of the sciatic nerve following 15 days of partial ischemia correlated with less significant elevation of ChAT in the ventral spinal cord. The changes of AChE activity were not significant during partial ischemia. ChAT in the peripheral stump of the sciatic nerve following 5 days of partial ischemia was preserved by 40% and AChE by 20% more than under normal blood supply. On the contrary, in the next 5 days interval losses of enzymes activity in the degenerating nerve were greater. ChAT was almost totally inactivated whereas 50% of AChE activity was preserved until the end of period examined.