Acetylcholinesterase activity in several rat liver cell fractions after repeated poisoning with some organophosphates.

The reported investigations were carried out on female Wistar rats aged about 6 weeks, weighing 150 g. During 28 days the fats were given daily organophosphates (DFP, DDVP, Chlorfenvinphos, IPO-62, IPO-63, Phospholine) in a dose of 1/10 LD50 subcutaneously. The observations were conducted on groups of 8 rats. The body weight of the animals was noted on the 10th, 20th and 28th day of the experiment. On the 28th day the rats were killed and the activity of acetylcholinesterase (AChE) was determined by the biochemical method of Hestrin in liver homogenate and in the microsomal, mitochondrial and soluble fractions of liver cells. After 28 days of the experiment the body weight of the rats poisoned with these substances amounted to from 80.8% (DFP) to 90.7% (IPO-63) of that in control animals. The AChE activity was also reduced in relation to the control group ranging in the liver homogenate from 49.7% (DFP) to 75.6% (IPO-63), in the microsomal fraction from 33.0% (DFP) to 63.8% (IPO-63), in the mitochondrial fraction from 45.5% (DFP) to 72.9% (IPO-63), and in the soluble fraction from 52.8% (DFP) to 80.5% (DDVP).