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PubMed1988

[Changes in the hexobarbital sleep and serum cholinesterase activity of rats treated with carbaryl].

Studies are carried out on the changes during the hexobarbital sleep and the cholinesterase activity in male rats subject to multiple oral introduction of carbaryl in relative low doses (40 mg/kg daily). The changes in the hexobarbital sleep and the relative weight of the liver during the 21-day treatment with carbaryl (40 mg/kg) show acceleration of the biotransformation processes in the organism of 6-month male albino rats. The raised activity of the serum cholinesterase activity can be accepted as an expression of the reinforced synthesis of protein in the liver.

Animals↗
PubMed1988

A longitudinal study of cholinesterase changes in pregnancy.

Serum cholinesterase activity was measured at intervals before, during, and after 44 pregnancies in 43 women. Three patterns of change were seen: (a) A decline in activity after conception, with no return towards pre-conception values before delivery (20 pregnancies). (b) A decline in activity accompanied by a partial or complete return to pre-conception values before delivery (19 pregnancies). (c) Either no discernible decline or increased activity during gestation (five pregnancies). We saw no association between these patterns and either the sex of the child, parity, smoking history, or alcohol intake. However, the continuous decrease in cholinesterase activity occurred in the youngest group of women, a decrease followed by an increase in the intermediate age group, and no decrease at all in the oldest group. Although not all the age-related differences quite reached statistical significance, these findings suggest that the patterns of change may be determined by some aspect of maternal physical maturity.

Adult↗
PubMed1988

Effect of cholinesterase inhibitors on Morris water task behavior following lesions of the nucleus basalis magnocellularis.

The effect of bilateral nucleus basalis magnocellularis (nBM) lesions on performance in the Morris water task was examined in the rat, and the ability of anticholinesterase inhibitors to reverse the behavioral deficit was evaluated. Lesions of nBM resulted in a prolongation of escape latency. A spatial probe trial revealed that animals with sham lesions swam a greater percentage of the distance in the platform quadrant; this finding was abolished by nBM lesions. Lesions of nBM produced a nonsignificant increase in both open-field activity and activity-box scores. In Experiment 1, administration of 0.32 mg/kg physostigmine on Day 3 only resulted in a decrease in escape latency. In Experiment 2, in which cholinesterase inhibitors were administered daily for 5 days, 0.32 mg/kg but not low-dose physostigmine or two substituted N,N-alkyl phenyl carbamate cholinesterase inhibitors (RA-6 and RA-7) again improved escape latency on Day 3. Thus it was concluded that nBM lesions impair behavior on the Morris water task and physostigmine shortens escape latency.

Animals↗
PubMed1988

Plasma cholinesterase genetic variants phenotyped using a Cobas-Fara centrifugal analyser.

A two-step colorimetric method that overcomes the difficulties of the classic 240 nm benzoylcholine assay for plasma cholinesterase has been adapted to a Cobas-Fara centrifugal analyser, using choline oxidase coupled with peroxidase/phenol/aminoantipyrine for detection of the choline produced. Reaction conditions of the main reaction are identical to those of the classical benzoylcholine assay. The described method was applied to 105 selected serum samples, previously classified by the Danish Cholinesterase Research Unit as homo- or heterozygous for the usual (U), atypical (A), fluoride-resistant (F), or silent (S) allelic variants. The method showed a distinct separation of the various phenotypes, with catalytic activity concentrations, dibucaine numbers, and fluoride numbers directly comparable to established reference values of the manual 240 nm benzoylcholine method.

Butyrylcholinesterase↗
PubMedDate not supplied

Brain choline acetyltransferase and muscarinic receptor sites, brain and liver cholinesterases in precocial Acomys cahirinus and altricial rat during post-natal development.

Brain choline acetyltransferase, acetylcholinesterase with its molecular forms, and muscarinic receptor sites, as well as liver total cholinesterases were evaluated during the first postnatal month in pups of a precocial (Acomys cahirinus) and altricial (rat) murid species. At birth the levels of brain cholinergic markers were higher in the Acomys than in the rat, but in adulthood the differences were smaller or even reversed. The postnatal increase up in the markers to weaning was considerably more pronounced in the rat. However, substantial variations in the patterns of development of the three cholinergic markers within and between species were observed. Liver cholinesterases were considerably higher in Acomys than in rats at all ages investigated. These and literature data are discussed in relation to postnatal, post-conception and post-organogenesis age of pups belonging to the two species. The variability of the ontogenetic patterns between the enzymes suggests that there is some biological control of individual rates of maturation and that it is necessary to be careful in broadly interpreting growth patterns across organs within the same species and across species.

Acetylcholinesterase↗
PubMed1988

Cimetidine does not affect plasma cholinesterase activity.

Blood samples were drawn from 10 ASA physical status 1 and 2 patients before (baseline) and after the administration of cimetidine to determine the in vivo effect of cimetidine on plasma cholinesterase (PCHE) activity. The in vitro effects of cimetidine at different plasma concentrations were also studied using the same blood samples. PCHE activity in the baseline samples was 432 +/- 4.6 (mean +/- SEM) U/ml, the dibucaine number 82. Administration of oral cimetidine (300 mg) the night before and 2 hours before surgery, failed to have any effect on PCHE activity (no in vivo effect). Plasma cholinesterase activity in the presence of cimetidine in vitro at plasma concentrations of 1.5, 15, 150, and 1500 micrograms/ml was 428, 420, 397, and 177 U/ml, respectively. Thus, in vitro data showed that cimetidine at plasma concentrations (1.5 to 15 micrograms/ml) achieved with clinical doses also has no effect on PCHE activity.

Adult↗
PubMed1978

Use of a programmable calculator in processing and interpreting serum cholinesterase phenotypes.

Cholinesterase phenotyping is done at 25 degrees C with use of benzoylcholine as substrate and dibucaine, fluoride, chloride, and succinyldicholine as inhibitors. We wrote a diagnostic program in modified BASIC language for the processing and interpretation of these cholinesterase phenotypes. We used the HP 9830A calculator. The diagnostic aspect of the program uses 646 words, a further 86 words being used to run this program. The traditional and the programmed reporting procedures were duplicated for 296 consecutive patients, with no case of disagreement between the two reporting methods as to the appropriate phenotype. The programmed system requested nine repeat analyses more than did the traditional method. Seven of these were due to the tight limits set in the program for the fluoride inhibitor numbers. These tight limits were set to ensure that there was as limited an overlap as possible between the phenotypes E1uE1u and E1uE1f. The remaining two repeats were due to the restrictions placed on the succinyldicholine inhibitor numbers that would be acceptable before a patient was designated as having the relatively rare phenotype, E1aE1f.

Cholinesterases↗
PubMed1987

Laboratory and field microassay of cholinesterases in whole blood, plasma, and erythrocytes.

A straightforward method is described for determination of the activities of erythrocyte acetylcholinesterase and plasma cholinesterase from single 10-mul samples of highly diluted whole blood. The procedure is a spectrophotometric microassay adapted for use with microtitration plates. The use of an enzyme immunoassay reader facilitates the rapid analysis of large numbers of samples. An inexpensive adaptation of the method was also devised that requires no instrumentation and was evaluated under field conditions in Haiti. Either the field or laboratory versions of the method can accurately determine increments of 10% or less in the level of inhibition of acetylcholinesterase or cholinesterase in whole blood, plasma, or erythrocytes.

Acetylcholinesterase↗
PubMed1986

Plasma cholinesterase phenotyping with use of visible-region spectrophotometry.

A method that overcomes the difficulties of the 240-nm benzoylcholine method for phenotyping plasma cholinesterases has been developed. After a timed reaction, under the same reaction conditions as in the classic procedure, choline is detected at 500 nm by use of choline oxidase coupled with the peroxidase/phenol/aminoantipyrine system. Cholinesterase activity measurements, calibrated by use of choline iodide as standard, are linearly related to results obtained with propionylthiocholine as substrate at 25 degrees C (y = 0.14x + 0.17, n = 30, r = 0.98). Results of differential inhibition with dibucaine and fluoride are virtually identical with those obtained by the ultraviolet method (y = 0.97x + 4.3, r = 0.995, and y = 0.93x - 0.5, r = 0.987, respectively) and give the same classification of homo- and heterozygotes for the usual, atypical, and fluoride-resistant variants. The new method has substantial advantages in that it eliminates the difficulties associated with measuring small changes in high absorbances at a suboptimal wavelength on a steep portion of the absorption curve.

Alcohol Oxidoreductases↗
PubMed1987

Improved accuracy of cholinesterase phenotyping after participation in a proficiency survey.

We report results of an investigation into the proficiency of cholinesterase (EC 3.1.1.8) phenotying, assessed in 13 laboratories between 1983 and 1986. Thirty-two specimens of serum were distributed for analysis: two, each in duplicate, from the eight genotypes that can be recognized by differential enzyme inhibitor numbers. The accuracy of genotype ascription was markedly improved over that observed in an earlier study in which 12 of these laboratories took part, although the proportion of clinically significant errors did not change. Consequently, although participation in a proficiency testing program can lead to a considerable enhancement of performance, we still recommend the use of reference centers for detailed cholinesterase studies.

Cholinesterases↗
PubMedDate not supplied

[Ability of reversible cholinesterase inhibitors to support dissociative learning].

In the experiments on rats performed to study dissociated learning it was found that reversible inhibitors of cholinesterase are interchangeable. It was shown that neutralization of the behavioral effect of cholinesterase inhibitors may be induced most successfully by combined administration of M- and N-cholinergic blocking agents.

Animals↗
PubMed1987

[Behavior of cholinesterase activity in lipid metabolism disorders].

In the serum of 127 patients with hypercholesterolaemia, hypertriglyceridaemia and mixed HLP the cholinesterase activities were determined. In hypercholesterolaemia they did not differ from persons with healthy metabolism, however, in hypertriglyceridaemia and mixed HLP were significantly increased. As the cause of increased cholinesterase activities an increased secretion of VLDL in the liver is discussed.

Cholinesterases↗
PubMed1986

Cholinesterase variants in a South African population.

Results of cholinesterase studies in 56 white and 22 black patients in Bloemfontein hospitals who developed suxamethonium apnoea between March 1974 and April 1985 are reported. Genotypes of patients and families are compared with figures for the UK and Denmark. A higher incidence of the silent cholinesterase allele is confirmed; the incidence of other variants is similar. Black patients were found to be only of the silent genotype.

Alleles↗
PubMedDate not supplied

[Express method of detecting mutant forms of human serum cholinesterase].

An express method is developed for detection of patients carrying dibucaine-resistant and "silent" variants of cholinesterase in blood serum. 200 donors as well as 25 patients with various with various pathological syndroms were examined; 5 patients carrying dibucaine-resistant cholinesterase were detected, which constituted 2.22% in the group. The method might be used in anesthesiology, blood transfusion and in experimental studies of the problems of medical genetics.

Cholinesterases↗
PubMedDate not supplied

Succinylcholine sensitivity and plasma cholinesterase deficiency.

Cholinesterase deficiency is a relatively rare condition. However, if unrecognized, this condition can be potentially fatal. The authors present a case report of cholinesterase deficiency and a review of the literature. Discussion of the preoperative evaluation and preventive measures is also included.

Adolescent↗
PubMed1985

[Value of the assay of cholinesterase activity in superficial biopsies of the rectum in the diagnosis of Hirschsprung's disease].

Cholinesterase activity have been estimated in rectal biopsies of 19 children with Hirschsprung's disease and 80 normal children. A high level of acetyl-cholinesterase is a strong argument for the diagnosis of aganglionosis. However the ratio acetylcholinesterase over butyrylcholinesterase seems to be a better sign allowing a right diagnosis in 99% of the cases.

Biopsy↗
PubMed1979

[Effect of pesticides on cholinesterase activity in the nervous elements of the heart in pregnant animals and fetuses].

Cholinestarase activity in the cardiac neural elements of pregnant animals and in their offspring was studied under the effect of chlororganic pesticide -- polychlorcamphen and phosphororganic pesticide -- valexone. The substances in question were demonstrated to produce variously pronounced unidirected changes in cholinesterase activity in neural structures that testifies to interconnection and dependence of the changes in the system mother -- fetus. The alterations observed in nonsynaptic (trophic) cholinesterase make it possible to speak about the disorder of cholinergic innervation and about the importance of acetilcholinesterase trophic function as a regulator of cellular processes, an inhibitory index of differentiation during embryogenesis.

Animals↗
PubMed1979

The activity of cholinesterases during the development of Xenopus laevis.

The activity of cholinesterases during the early development of Xenopus laevis has been examined, and the activity of acetylcholinesterase in particular has been distinguished from other cholinesterases. In contrast to some earlier findings, the activity of acetylcholinesterase is low at early stages and gradually increases during development. Possible reasons for the differences between the earlier results and those reported here are discussed.

Acetylcholinesterase↗