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  • 1
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: At 20 days of age, 72 Holtzman rats were divided into six groups (10-14 rats/group) and were placed on a vitamin A-deficient diet. The animals in groups I and II were kept intact, while the animals in the remaining groups were ovariectomized at 20-22 days of age. The rats in groups I, III and V received a dietary supplement of retinoic acid (50 μg) while the diet of the animals in groups II, IV and VI was supplemented with retinol (25 μg). In addition to the dietary supplements the animals of groups V and VI were treated with estradiol dipropionate (1 μg). The dietary supplements and hormone were given three times per week. The rats were autopsied after 15 weeks on the experiment.In the intact rats of group I metaplastic changes were observed in the luminal and glandular epithelia. With the exception of two uterine sections showing small areas of squamous metaplasia in the glands, morphological alterations of the uterine epithelia were not observed in the rats of group II. Uterine metaplasia was not seen in the rats of groups III and IV. Extensive metaplastic changes were observed in the animals of group V. The endometria of the rats in group VI were lined primarily by high columnar cells, but a few uterine sections contained small foci of stratified squamous metaplasia.The results indicate that retinol is effective in preventing the morphological changes in the rat uterus due to vitamin A deficiency.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 183 (1975), S. 563-566 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The study was designed to determine whether or not the rat uterine luminal epithelium exhibits a mitotic circadian rhythm and to ascertain the effect of estrogen treatment at different time periods on the uterine epithelial mitotic response. Immature rats were injected with either sesame oil (controls) or 60 ng of estradiol-17 β at eight time periods and were necropsied 24 hours after treatment. Colchicine was administered IP two hours before autopsy. Peak mitotic activity was observed during the nocturnal phase (0300) for both the control and estrogen-treated rats. The nadirs were recorded during the diurnal phase (1800 and 1200 for the control and estrogen groups, respectively). The differences between low and high values were 1100% for the control rhythm and 101% for the estrogen animals. The data demonstrate the existence of overt circadian rhythms in the uterine epithelium for both control and estrogentreated rats.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Glycogen localization in the myometrium and luminal epithelium of the rat uterus was studied by the periodic acid-leucofuchsin technique after ovariectomized rats had been treated with various regimens of 1.0 μg estradiol dipropionate and 50.0 μg clomiphene citrate. Three regimens were used: (a) one or three dosages of clomiphene, alone or in combination with one or three dosages of estradiol; (b) a single dosage of clomiphene before a single dosage of estradiol; (c) a single dosage of clomiphene after a single dosage of estradiol.The estrogenic effect of clomiphene on the myometrium was less than that of estradiol. Clomiphene suppressed myometrial glycogen accumulation induced by estradiol when administered with estradiol, six hours before the hormone, or as long as 24 hours after estradiol. The luminal epithelium responded differently to estradiol and clomiphene: the number of luminal epithelial cells containing glycogen strikingly increased after clomiphene treatment but not after estradiol treatment. A few scattered cells contained glycogen 24 hours after one dosage of the drug. Forty-eight hours after a single dosage or after three dosages of the drug administered one per day, every luminal epithelial cell contained glycogen. The effect of clomiphene on the luminal epithelium may be either a unique action of the drug or an abnormal response of the tissue, similar to that reported for high doses of estradiol. This effect of clomiphene on the luminal epithelium may possibly be a factor in the drug's ability to block blastocyst implantation in the rat.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The influence of different estrogen-progesterone ratios on DNA synthesis in the rat uterus was investigated. Ovariectomized rats were injected subcutaneously daily for three days with either oil, 1 μg estradiol-17β dipropionate or estradiol and 1, 5, 10 or 15 mg progesterone. Tritiated thymidine was administered one hour prior to necropsy. Thymidine indices were determine for both the luminal and glandular uterine epithelia while the total number of labeled nuclei in the stroma was ascertained. In all tissues studied, significantly more nuclei from uteri of rats given only estrogen replicated DNA than from those of the oil-treated controls. While concurrent treatment with estradiol and 1 or 15 mg progesterone did not statistically alter the extent of thymidine incorporation in the luminal epithelium and stroma from that observed following estrogen alone, 5 or 10 mg progesterone given with estrogen significantly suppressed the labeling activity in the luminal epithelium and stroma from that of the estrogen-treated rats. However, the thymidine indices of the glandular epithelium from uteri of rats injected with all combinations of both hormones were significantly lower than that from uteri of estrogen-treated rats. These data indicate that the estrogen-progesterone ratio is important in regulating cell turnover in the luminal epithelium and stroma of the rat uterus but not in glandular epithelium.
    Additional Material: 1 Tab.
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  • 5
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The ultrastructural effect of progesterone, alone and in combination with estrogen, on smooth muscle cells of the rat uterus was studied. Adult, bilaterally ovariectomized rats were untreated (controls) or treated with either progesterone (1 mg), estrogen (1 μg) or both on three consecutive days.Uterine muscle cells appeared larger and myofilaments more abundant in the progesterone-treated rats than in the other groups of animals. Many micropinocytotic vesicles and several dense bodies were present in muscle cells of control, progesterone and estrogen-progesterone-treated rats. In the progestrone-treated group, smooth muscle cells contained little granular endoplasmic reticulum and few ribosomes and glycogen particles, similar to the controls. Mitochondria were more numerous than in the control animals but similar to those seen in the estrogen or estrogen-progesterone-treated rats. Although an accumulation of granular endoplasmic reticulum, free ribosomes, glycogen particles and extensive Golgi complexes occurred in both estrogen and estrogen-progesterone-treated rats, they were more extensive in the former group.The observations indicate that progesterone alters the ultrastructure of the smooth muscle cells but not to the degree observed following estrogen stimulation. It does not markedly inhibit the effect of estrogen on the fine structure of the uterine smooth muscle cells. These observations support previous biochemical studies on glycogen concentration, RNA and protein synthesis in the rat uterus.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 503-505 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: UDPG-glycogen synthetase was studied in the uterus of ovariectomized and ovariectomized-hormone treated rabbits and in the tongue. Following the biochemical technic of Leloir and Goldenberg it was not possible to demonstrate the enzyme in the uterus of the ovariectomized or ovariectomized treated animals. However, in the tongue the enzyme was present. The data from this study along with previous histochemical studies indicates that the glycogen in the uterine muscle is not synthesized through the UPDG pathway, but is synthesized from G-1-P by the action of phosphorylase. Since UDPG-glycogen synthetase can be demonstrated in the tongue a difference seems to exist in glycogen synthesis between the smooth muscle of the uterus and skeletal muscle of the tongue.
    Additional Material: 1 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 202 (1982), S. 255-260 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The purpose of this study was to compare the effects of different dosages of ethanol on ovarian morphology and function. Holtzman rats, 20 days old, were divided into groups as follows: The rats in Group I were autopsied at 20 days of age, and those in Group II were placed on ad libitum chow and water diet; the rats in Groups III and V were fed on a liquid diet containing 2.5% or 5% ethanol respectively; Groups IV and VI were pair-fed controls to Groups III and V, respectively. Rats in Groups II, III, IV, and VI were maintained on the diets for 50-55 days and killed at late proestrus-estrus, while the animals in Group V did not exhibit estrous cycles and were killed on day 55 of treatment. The average increase in body weights of rats in Groups II, III, and IV was significantly greater than the increase in body weights of rats given 5% ethanol or their pair-fed controls. In the rats treated with 5% ethanol, vaginal opening was significantly delayed from the controls, estrous cycles were absent, ovarian weights were similar to those of the 20-day-old rats, ovaries contained corpora lutea of only one estrus, uteri weighed less than controls, and histologically, the uteri and vaginae were similar to those of 20-day-old rats. However, in the rats treated with 2.5% ethanol, all of the parameters were similar to those of the controls. The average serum alcohol level for the rats on the 5% ethanol diet was 249 mg%; the serum alcohol levels were at the lower limit of detection for the rats on the 2.5% ethanol diet. The data show that ovarian function was suppressed in the rats that received the 5% ethanol but not in rats on the 2.5% ethanol diet.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 208 (1984), S. 215-222 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The purpose of this study was to determine the effect of ethanol consumption on compensatory ovarian hypertrophy (COH) which occurs follwoing unilateral ovariectomy. Holtzman rats, 40 days old, were either unilaterally ovariectomized or sham-ovariectomized. The rats were then placed into subgroups which would receive either an ad libitum chow and water diet, a liquid diet, or a liquid diet containing 5% ethanol. The animals were maintained on their respective diets for 11 days. The rats were killed at 51 days of age, and the ovaries and uteri were removed, weighed, and prepared for histological investigation. The results showed that uteri from ethanol-fed animals failed to develop epithelial glands and exhibited a condensed stroma in comparison to uteri from animals fed ad libitum or pair-fed to ethanol-fed rats. Also, rats that were fed ad libitum had a COH of 82 ± 16% and rats that were pair-fed a liquid diet had 114 ± 28% COH; rats that were fed the liquid diet containing ethanol did not experience compensatory ovarian hypertrophy (-3 ± 10%). Histologically, the ovaries of rats fed ad libitum showed large numbers of corpora lutea and only a few mature ova. The histology of ovaries from pair-fed animals was similar to those from animals fed ad libitum. In contrast, the ovaries from the animals fed the ethanol diet had nearly twice as many mature ova but only one-fourth as many corpora lutea as the number seen in ovaries from the other groups. The data show that ethanol consumption inhibits COH by suppressing ovulation and the subsequent luteal formation.
    Additional Material: 2 Ill.
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  • 9
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The squirrel monkey uterine cervix was studied macroscopically and microscopically in intact and ovariectomized monkeys. The effect in ovariectomized monkeys of estradiol dipropionate or progesterone of both given after estrogen priming was studied by PAS staining.The lower portion of the cervix was dilated to form a vestibule into which projected fibromuscular colliculi which arose from the isthmic end of the cervix. The stratified squamous epithelium of the vagina was continuous through the external os with a similar epithelium lining the vestibule and covering the external surfaces of the colliculi. The transitional zone between the stratified epithelium and columnar cells was variable. The colliculi were covered internally with mucosal folds of columnar epithelium continuous with those of the endocervical canal.Glycogen concentration in the smooth muscle did not fluctuate markedly, irrespective of the hormones used. Glycogen granules were more numerous in the stratified squamous epithelium. Malt-diastase-resistant material appeared to be more abundant in the columnar epithelium and glandular lumina when the monkeys received both hormones than when they received solely estrogen or progesterone.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Phosphorylase and UDPG-glycogen synthetase were studied in the smooth muscle of the urinary bladder, large intestine, skeletal muscle (adductors of thigh), and esophagus of the adult male and female rat. The two enzymes were investigated by histochemical and biochemical procedures.In the skeletal muscle of the thigh and esophagus, UDPG-glycogen synthetase was not as strong as phosphorylase. The latter enzyme was strong in the smooth muscle cells of the urinary bladder and large intestine. The response was better in the inner circular than in the outer longitudinal layer of the large intestine. Only phosphorylase was detected in the muscularis mucosa of the esophagus and large intestine. UPDG-glycogen synthetase activity varied from a good response to a very weak one in the smooth muscle cells of the urinary bladder and large intestine. In the latter organ the response was stronger in the inner circular than in the outer longitudinal layer. From the biochemical studies phosphorylase and UDPG-glycogen synthetase were determined to be present in significant amounts in the urinary bladder, large intestine, and skeletal muscle of the thigh.Since significant amounts of the enzymes are present in smooth muscle, glycogen may be synthesized from UPDG by the action of UDPG-glycogen synthetase, while phosphorylase is concerned with the breakdown of glycogen to G-1-P. However, more information on the relationship of the enzyme to glycogen concentration in smooth muscle is needed.
    Additional Material: 2 Tab.
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