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I I Poletaeva

Publications and source records attributed to I I Poletaeva.

At least 19 recordsLinked to original sources
PubMed1997

Pentylenetetrazol and strychnine convulsions in brain weight selected mice.

The seizure sensitivities to pentylenetetrazol (Ptz, 25-100 mg/kg) and strychnine (S, 2 mg/kg) were tested in two mice lines selected for large (LB) and small (SB) brain weight (brain weight difference being approximately 75 mg). The selection was based on a regression line connecting body and brain weight. SB mice were more sensitive to both drugs-their seizure latencies were shorter and lethality higher than in LBs. The seizures generated by Ptz and S are known to affect different neurotransmitter systems. The interstrain differences in seizure susceptibility are probably determined by SB mice nervous system traits rather than by differences in the particular neurochemical trait. The data on neocortical cytoarchitectonics obtained during our previous brain selection experiment could serve as the indirect evidence favouring such a suggestion.

Animals↗
PubMed1997

[Selection of mice for brain weight].

The results of two experiments on selection of laboratory mice for large and small brain weight are presented. Selection was based on the regression relationship between body and brain weight. This allowed considerable differences in brain weight to be obtained accompanied by insignificant interlinear differences in body weight compared to the range of intralinear variation. The two lines of mice with a large and small brain weight (F9-F10) differed significantly in brain weight. The absolute difference was 60-70 mg, i.e., approximately 13% of the brain weight in the original heterogeneous population.

Animals↗
PubMed1995

[Behavior of adult mice of various strains after exposure of thiophosphamide during organogenesis].

Females of strains 101/HY and CBA were treated with a single dose of thio-TEPA (0, 0.625, or 1.25 mg/kg body weight) on day 12 of gestation (deposition of a vaginal plug was considered as the first day of gestation). Special experiments were performed on their offspring at 3 months of age to study exploratory-research activity (burrow reactions, upright postures), locomotor activity in a "open field" cage, emotional reactivity, and level of feeding motivation. Changes in behavior after exposure to thio-TEPA were observed in mice of both sexes and genotypes; however, in 101/HY mice, which are characterized by genetically determined genome instability and a defect in DNA repair system, such changes were more pronounced. In general, they may be defined as a decrease in intensity of exploratory-research activity with some modulation of the level of motor activity. Sex differences in behavior of animals of both strains after prenatal exposure to thio-TEPA were also found. The data provide evidence about the specific role of genetic factors in variation of mouse behavior after prenatal exposure to thiophosphamide and allow consideration of thio-TEPA as a behavioral teratogen.

Animals↗
PubMed1994

Swimming navigation, open-field activity, and extrapolation behavior of two inbred mouse strains with Robertsonian translocation of chromosomes 8 and 17.

Female mice from inbred strains carrying a Robertsonian translocation (nine CBARb and eight C57BL/6Rb) were compared with animals from their respective strains (seven CBA and nine C57BL/6) first in open-field activity (two exposures of 10-min duration), then during 5 days (with six trials each) in Morris' swimming navigation test, and finally, in their ability to extrapolate the future position of a food reward being moved slowly out of their reach. ANOVA (strain and translocation) revealed significant effects of Robertsonian translocations (Rb) in swimming navigation, Rb mice being impaired primarily in the initial phases of acquisition and during the first trials of platform reversal and the impairment being stronger in C57BL/6 mice. In the open field, Rb mice were as active as the normal strains but showed significantly increased path tortuosity and moved slightly faster. In the extrapolation task, Rb mice showed above-chance levels in moving to the target indicated by the disappearance of the stimulus, while normal mice chose at chance levels, but the translocation effects were not statistically significant. These data indicate that telocentric fusion of chromosomes may entail behavioral alterations, perhaps by subtle changes in neurotransmitters or limbic circuitry. The expression of such alterations, however, can be remarkably strain dependent.

Animals↗
PubMed1993

Genetic aspects of animal reasoning.

This paper reviews the investigations of Prof. L. V. Krushinsky and his colleagues into the genetics of complex behaviors in mammals. The ability of animals to extrapolate the direction of a food stimulus movement was investigated in wild and domesticated foxes (including different fur-color mutants), wild brown rats, and laboratory rats and mice. Wild animals (raised in the laboratory) were shown to be superior to their respective domesticated forms on performance of the extrapolation task, especially in their scores for the first presentation, in which no previous experience could be used. Laboratory rats and mice demonstrated a low level of extrapolation performance. This means that only a few laboratory animals were capable of solving the task, i.e., the percentage of correct solutions was equivalent to chance. The brain weight selection program resulted in two mice strains with a 20% (90-mg) difference in brain weight. Ability to solve the extrapolation task was present in low-brain weight mice in generations 7-11 but declined with further selection. Investigation of extrapolation ability in mice with different chromosomal anomalies demonstrated that animals with Robertsonian translocations Rb(8,17) 1lem and Rb(8,17) 6Sic were capable of solving this task in a statistically significant majority of cases, while mice with fusion of other chromosomes, as well as CBA normal karyotype mice, performed no better than expected by chance. Mice with two types of partial trisomies and animals homo- and heterozygous for translocations were also tested.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1992

[An unusual type of locomotion in mice of line 101/Hy].

An unusual type of locomotion--backward movements--was revealed in the 101/HY mouse strain characterized by a chromosomal instability and the defect in DNA repair. The backward movements were found in 60% of mice belonging to the population under study. The manifestation of the character was found to vary: it was high in 16% of the animals. No age and sex differences were found. The backward movements in the 101/HY mouse strain were somewhat similar to the peculiarity in locomotion of the neurological hot-foot mouse mutants. The latter had mild anatomical alterations in the cerebellum. No obvious brain pathology was revealed in the 101/HY mice.

Animals↗
PubMed1986

[Behavior of mice with robertsonian translocations of chromosomes].

The behaviour of mice with normal karyotype and those with robertsonian translocations was studied. The ability of the animals to solve an extrapolatory task was analysed. The experimental procedure was initiated with presentation of a food bait which the animal could reach only through a small opening in a screen. As the mouse started drinking, the food cup was moved leftward or rightward disappearing from the animal's view. The problem was to move in the direction of food, in which case the mouse could find it behind one of two feeding holes, to the right or to the left of the starting point. Laboratory mice were not able to solve this problem, whereas mice containing Rb(8, 17)1 IEM in karyotype demonstrated the extrapolatory ability - they solve the task correctly in a significant majority of cases. By means of a series of backcrosses of Rb(8, 17)1 IEM carriers on CBA strain (these mice have no extrapolatory ability) and subsequent inbreeding, a novel inbred strain was obtained, coisogenic to CBA and possessing the robertsonian translocation Rb(8, 17)1 IEM. These mice with the CBA genetic background solve the extrapolatory problem successfully, the level of correct choices being significantly above the 50% chance level. At the same time, their performance was lower than that of outbred mice with Rb(8, 17)1 IEM, the phenomenon possibly being the result of the influence of CBA genetic background. Mice with Rb(8, 17)6 Sic were also shown to possess the extrapolatory ability.(ABSTRACT TRUNCATED AT 250 WORDS)

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