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Biomedical subjects

O N Savchenko

Publications and source records attributed to O N Savchenko.

At least 19 recordsLinked to original sources
PubMed1999

[Changes in secretion of sex steroid hormones during stress in rats with various brain excitability].

A stress procedure decreased the plasma progesterone faster in highly excitable rats than in the less excitable those. The decrease in gonadal and adrenal progesterone was still obvious in 24 hours in both groups of rats but more obvious in the former group in respect to the progesterone level. The data obtained may help to understand individual ability to respond to a stress in a different way depending on functional condition of the hypothalamo-pituitary-adrenal axis.

Adrenal Glands↗
PubMed1995

[The effect of postnatal sympathectomy on the production and receptor binding of sex steroids in female rats during puberty].

The total chemical desympathization caused by injection of 6-hydroxydopamine in the first day of life increased the progesterone secretion, decreased the estradiol secretion and abolished translocation of estradiol receptors to the cell nuclei in the uterus of 1-2 days old rats, which correlated with the absence of uterus weight increase after exogenous estradiol injections. The peripheral desympathization caused by injection of neurotoxin to two weeks old rats induced only estradiol secretion decrease, but to the less extent than after total desympathization.

Animals↗
PubMed1995

[Early chemical sympathectomy and the function of the hypophyseal-gonadal system in sexually immature and adult female rats].

Early chemical desympathisation with 6-hydroxydopamine decreased the contents of the follicle-stimulating hormone in the blood serum of 1-month old rats. The steroidogenesis disturbances were more obvious in sexually immature rats in the general desympathisation. In sexually mature rats, these disturbances disappeared. Sympathetic innervation seems to play a major part in development of the reproductive system in rats.

Animals↗
PubMed1994

[Steroidogenesis in the adrenals and gonads of rats following the neonatal administration of hydrocortisone].

Neonatal administration of hydrocortisone decrease steroidogenesis in the rat adrenals in immature and mature animals production of progesterone and androstenedione reducing, at that. Primary long-term disturbance of central regulatory influences controlling steroidogenesis in adrenals, was proposed. The steroid production disturbance in the gonads was lesser than in the adrenals and was found only in mature rats.

Adrenal Cortex Hormones↗
PubMed1993

[Weak androgens, their importance experimentally and clinically].

Antisera obtained for certain hormones possessed a high specific effect on homologous hormones. Radioimmunological methods were worked out for determination of these hormones in the blood serum of humans and animals. Clinical use of the above antisera for determination of dehydroepiandrosterone and androstenedione in humans revealed than it could be useful to determine dehydroepiandrosterone in some forms of hypogonadism. Androstenedione is often increased in female hirsutism.

Androstenedione↗
PubMed1992

[The content of sex steroid receptors and the activity of marker enzymes of estrogenic action in the uterus of androgen-sterile rats].

In rats with preserved ovaries, both in normal and in neonatally androgenized, the activity of enzymes kreatinphosphokinase and peroxidase cannot serve as the marker of the estradiol effect upon the uterus. In ovariectomised animals, the dynamics of activity of these enzymes corresponds to uterotropic responses to estradiol. but not to the dynamics of hormone receptor complexes. The data obtained makes doubtful the participation of the hormone receptor complexes in realisation of the estrogens effect upon the uterus.

Animals↗
PubMed1991

[The negative and positive phases of the reaction of the hypothalamo-hypophyseal-gonadal system in female rats to the administration of sex hormones].

I.m. administration of estradiol benzoat in physiological doses decreased 3-fold the lutropin secretion and follitropin secretion by one third, in ovariectomised rats. The same dose in intact rats decreases the lutropin level in the blood and gonadoliberin contents in the medial eminence by the negative feedback mechanism. In 4-6 hrs after injection the positive effect of estradiol is at its highest level, the lutropin level in the blood increases by 80-100 times, the follitropin--by 2-3 times. Therefore, estradiol plays a decisive role in positive as well as negative effects on the lutropin secretion, whereas its effect upon follitropin secretion is less obvious. The gonadoliberin transport in negative phase of estradiol effect is mainly performed through the medial eminence whereas the positive effect of estradiol needs a participation of organum vasculosum of the lamina terminalis too.

Animals↗
PubMed1991

[The effect of aminostimil on the regulation of sexual function in rats].

The effect of aminostimil: a synthetic drug of the acylhydrazide group, was studied in white rats. Aminostimil decreased the uterus weight but did not interfere with estrogen positive action in ovariectomized (OVX) rats, although it increased the FSH level, abolished the inhibitory effect of estradiol on the FSH secretion and did not change the secretion of the LH. Aminostimil induced accumulation of GnRH in the preoptic area and median eminence area in intact female and male rats, LH concentration in the blood plasma but decreased. The data obtained suggest that the antiestrogenic effect of aminostimil is due to inhibition of the GnRH secretion from the hypothalamus into the portal blood.

Animals↗
PubMed1991

[The ratio of sex hormone production by the ovaries and the adrenal cortex in different phases of the rat estrous cycle].

The biosynthesis of estradiol and testosterone was found to occur mainly in the ovaries (4-5 and 10-20 times more than in the adrenals during diestrus and proestrus, resp.). Estron and androstendion were produced equally in both glands. The estrogens and androgens were found to act as synergists in the stimulation of biosynthetic processes in the uterus. Their level in peripheral blood reflects less fully the character of hormonal function of the ovaries than study of these steroids in the incubates of the ovaries. The biosynthesis of progesterone in adrenals exceeds 2-3-fold that in the ovaries. No changes on production of this hormone depending on the cycle phase, were found.

Adrenal Cortex↗
PubMed1991

[Critical periods in the pubertal development of girls].

The authors analyze the results of physical and sexual development of girls at the pubertal period, as well as their blood levels of hormones participating in the growth regulation and characterizing the +hypophyseal-gonadal relations. A staged pattern of pubertal period is emphasized+ and the critical period singled out: the age of menarche onset and establishment of the ovulation cycle (at the age of 14-15).

Adolescent↗
PubMed1991

[Feto-placental system in diabetes mellitus and hydramnios].

The fetoplacental system of 132 women with diabetes mellitus and 85 healthy women was studied during the third pregnancy trimester. Blood estradiol and urinary estriol levels were found-reduced in the diabetics, particularly in those with insulin-dependent diabetes. Blood progesterone and oxytocinase levels were found unchanged. These parameters lowered in diabetic glomerulosclerosis. If pregnant diabetics develop hydramnion, their blood estradiol, progesterone, prolactin, and oxytocinase levels increased.

Adult↗
PubMed1990

[17 beta hydroxysteroid dehydrogenase and creatine phosphokinase activities and the levels of sex hormones and their receptors in the uterus of patients with fibromyoma or endocrine sterility].

Examination of endometrial and myometrial activity of steroidogenic enzyme markers, 17 beta-hydroxy steroid dehydrogenase (17 beta-HOSD) and creatine phosphokinase (CP), in women with fibromyoma or endocrine infertility has demonstrated that endometrial 17 beta-HOSD activity corresponded to ovarian progesterone secretion rates but did not correlate with cytosolic progesterone secretion rates but did not correlate with cytosolic progesterone receptor levels. The magnitude of uterine effects of endogenous progesterone in the patients with endocrine infertility and fibromyoma may be inferred from (1) hormone ability to induce 17 beta-HOSD, and (2) ability to reduce cytosolic progesterone receptor levels. Neither endometrial nor myometrial CP represents a "pure" marker of estrogenic influence.

17-Hydroxysteroid Dehydrogenases↗
PubMed1990

[Physiologic mechanisms of the reaction of the reproductive system in female rats to chronic exposure to low doses of toluene].

Chronic inhalation of toluol (2-4 months) did not affect the menstrual cycle in female rats but distorted the mechanisms of the reproduction control. The level of gonadoliberin decreased during dioestrus in preoptic area, the correlation between concentrations of luteinizing and folliculo-stimulating hormones became disordered, and the prolactin secretion increased. Preovular peaks of gonadotropins secretion became lower in proestrus. The cold stress increases the prolactin secretion and decreases the gonadoliberin content in the hypothalamus of control animals. These events do not happen after toluol inhalation. After 4 months of toluol inhalation, the levels of estradiol and progesterone decrease in the blood. However, normal response to gonadotropic stimulation is preserved which suggests a secondary character of hormonal disorders, in response to primary disturbances in the hypothalamo-hypophyseal link of the reproduction control.

Administration, Inhalation↗
PubMed1989

[Endometrial estradiol and progesterone receptors in women with various clinical forms of luteal insufficiency].

Changes in uterine estradiol and progesterone receptor content in patients with luteal insufficiency (the insufficient luteal phase/ILP/ syndrome developing in the presence of tubal and uterine inflammations, hyperandrogenism or insignificantly increased prolactin level were described. The level of steroid receptors is correlated to blood levels of the respective hormones throughout the cycle. It is suggested that changes in sex steroid receptors are secondary to disorders of progesterone and estradiol secretion in cases of the ILP syndrome developing in the presence of uterine and tubal inflammations, and in patients with increased blood prolactin. In hyperandrogenic patients with the ILP syndrome, nuclear progesterone receptors night possibly be inadequate.

Adult↗
PubMed1989

[The synthesis of estradiol and progesterone receptors in relation to the biological effects of sex hormones in ovariectomized rats].

The concentration of the estradiol and progesterone receptors in cytosol increased within a week after ovariectomy in rats, the nucleic concentration of receptors sharply diminishing. The uterus atrophy following ovariectomy in associated with a reduction of both nucleic and cytosol receptors in the organ. Administration of estradiol (1 mg) restored the organ mass and the character of hormonal reception within a week. Progesterone and clomyphen exerted some uterotropic effect. Ovariectomy reduced the creatinkinase activity by 2.9 times and the peroxydase activity by 13 times. Two types of synthesis of female sex hormones receptors seem to exist in the rat uterus: the constitutional type depending on no hormonal effects and the induced one depending on the sex steroids, estradiol in particular.

Animals↗
PubMed1988

[Interrelation of the hormonal indices and the cytologic characteristics of the germ cells].

The analysis of the maturation of follicular oocytes as well as of the state of gametes after induction of ovulation with PMSG or with GnRH in intact and androgenized rats revealed the dependence of the heterogeneity extent (in morphologic and chromosomal damages) of population of germ cells maturing in vivo and in vitro upon the character of gonadotropin regulation disturbances of folliculogenesis. Stable disorder of reproductive function (androgenization) is followed by a significant increase in number of abnormal gametes under its hormonal correction.

Animals↗