Wyniki wyszukiwania - Biblioteka Nauki

1

Investigations on the secretion mechanism of corticosteroid hormones

100%

Nussdorfer G. G.

Folia Histochemica et Cytobiologica

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1984

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tom 22

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nr 3-4

2

Exogenous steroid hormones stimulate full development of autonomous endosperm in Arabidopsis thaliana

88%

Rojek J. , Pawelko L. , Kapusta M. , Naczk A. , Bohdanowicz J.

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nr 2

EN

Most flowering plants, including important crops, require double fertilization to form an embryo and endosperm, which nourishes it. Independence from fertilization is a feature of apomictic plants that produce seeds, from which the plants that are clones of the mother plant arise. The phenomenon of apomixis occurs in some sexual plants under specific circumstances. Since the launch of a fertilization-independent mechanism is considered a useful tool for plant breeding, there have been efforts to artificially induce apomixis. We have been able to produce fertilization-independent endosperm in vitro in Arabidopsis over the last few years. This paper demonstrates the methods of improving the quality of the endosperm obtained using plant and mammalian steroid hormones. Additionally, it shows the study on the autonomous endosperm (AE) formation mechanism in vitro. This paper examines the effect of exogenous steroid hormones on unfertilized egg and central cell divisions in culture of unpollinated pistils of Arabidopsis Col-0 wild-type andfie-1 mutant. All media with hormones used (estrone, androsterone, progesterone, and epibrassinolide) stimulated central cell divisions and fertilization-independent endosperm development. The stages of AE development followed the pattern of Arabidopsis thaliana wild type after fertilization. Subsequent stages of AE were observed from 2-nuclear up to cellular with the most advanced occurring on medium with 24-epibrassinolide and progesterone. The significant influence of mammalian sex hormones on speed of AE development and differentiation was noticed. Using restriction analysis, the changes in methylation of FIE gene was established under in vitro condition. The authors of this paper showed that Arabidopsis thaliana has a high potency to fertilization-independent development.

3

Studies on mechanisms of steroid hormone action on thymys stromal cells

88%

Butowska W. , Filipiak K. , Warchol J. B.

Folia Histochemica et Cytobiologica

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1997

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tom 35

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nr 2

4

Membrane receptors for steroid hormones?

88%

Marcinkowska E.

Cellular and Molecular Biology Letters

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2002

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tom 07

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nr Suppl.

5

Prenatal glucocorticoids can programme postnatal development

75%

Tomaszewska E. , Dobrowolski P.

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2011

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tom 05

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nr 1

6

Steroid hormone (prednisolone) influence on the unicellular Tetrahymena (an electron microscopic study)

75%

Csaba G. , Fulop A. K.

Acta Protozoologica

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1987

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tom 26

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nr 3

7

Immunohistochemical localization of androgen receptor [AR] in rat ovary

75%

Slomczynska M. , Szoltys M.

Folia Histochemica et Cytobiologica

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1997

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tom 35

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nr 2

8

Influence of exogeneous gonadotrophins on steroid hormone secretion by luteal cells of high fecundity Olkuska sheep

75%

Zieba D. , Wierzchos E. , Lauria A.

Folia Histochemica et Cytobiologica. Supplement

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1997

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tom 35

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nr 2

9

Prenatal exposure to anticonvulsant drugs and spatial ability in adulthood

75%

Dessens A. , Cohen-Kettenis P. , Mellenbergh G. , Van de Poll N. , Koppe J. , Boer K.

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1998

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tom 58

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nr 3

10

Steroid hormones and their receptors in rodent male gonad

75%

Kotula M. , Bilinska B.

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tom 42

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nr 1

11

Relationship between receptors for insulin-like growth factor - I, steroid hormones and apoptosis-associated proteins in canine mammary tumors

63%

Dolka I. , Motyl T. , Malicka E. , Sapierzynski R. , Fabisiak M.

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tom 14

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nr 2

EN

In the veterinary literature there are few data concerning the expression of insulin-like growth factor type I (IGF-IR) in the canine mammary gland tumors. The aim of the present study was the evaluation of IGF-IR expression and its correlation to the expression of estrogen receptor α (ERα) and progesterone receptor (PR), proteins: Bcl-2, Bax, p53 in canine mammary gland tumors, and also a correlation with other features: bitch’s age, tumor diameter, histologic type of tumor, degree of histologic malignancy, proliferate activity. The study was done on 112 epithelial neoplasms: 21 (19%) were adenoma, 38 (34%) complex carcinoma (adenocarcinoma), 47 (42%) simple carcinoma (adenocarcinoma) and 6 (5%) solid carcinoma. Histochemistry and immunohistochemistry methods were employed. It was shown that more common and/or higher IGF-IR expression in cells of canine mammary gland tumors was related to the histologic type of cancer of worse prognostic (solid and simple carcinoma), high histologic degree of malignancy (IIIo) but the statistical analysis did not reveal any significant differences. We observed the high degree of IGF-IR expression in tumors which displayed the high ERα and PR expression. These results suggest the involvement of IGF-IR in the development of hormonosensitive canine mammary tumors. Additionally, the significant positive correlation between expression of IGF-IR and p53, Bax was found. Our study provides some evidence that interactions exist between the IGF-IR and these apoptosis-associated proteins may contribute to the development and progression of canine mammary gland tumors. These results require further investigations.

12

The effect of selective agonists of opioid receptors on in vitro secretion of steroid hormones by porcine endometrium during the estrous cycle and early pregnancy

63%

Dziekonski M. , Zmijewska A. , Czelejewska W. , Wojtacha P. , Okrasa S.

Journal of Physiology and Pharmacology

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2018

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tom 69

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nr 5

13

Bile acid transport in hypercholesterolemic resistant rabbits

63%

Izzat N. N. , Overturf M. , Weisbrodt N. W. , Loose D. S.

Journal of Physiology and Pharmacology

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2009

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tom 60

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nr 3

79-84

EN

We examined bile acid transport and expression of the apical sodium-dependent bile acid transporter (ASBT) in ileal preparations to determine if alterations in bile acid excretion contributed to a hypercholesterolemia-resistant phenotype in rabbits (CRT/mlo). Taurocholate transport was not different between normal (NR) and CRT/mlo rabbits fed regular diet. However, feeding cholesterol-enriched diet reduced taurocholate transport significantly in CRT/mlo rabbits (0.53±0.06 pmol/µg protein) compared to regular diet (0.95±0.14 pmol/µg protein), but had no effect in NR rabbits. Cholesterol-enriched diet increased ASBT mRNA in CRT/mlo (2.6 ± 0.7 to 5.4 ± 0.1); no significant changes occurred in NR. Some CRT/mlo rabbits carry a polymorphism in ASBT at amino acid 333 (P333L). In transfected HEK293 cells, TC transport of P333L allele was significantly lower (0.08 ± 0.01 vs 0.13 ± 0.01 pmol/µg protein/15 sec, P< 0.05). This allele was not found in NR rabbits. The data suggest that the phenotype of the CRT/mlo rabbit is due to changes in bile acid transport as well as bile acid metabolism.

14

Activity of delta5-3beta-hydroxysteroid dehydrogenese and steroid hormones content in early preimplantation horse embryos

63%

Paulo E. , Tischner M.

Folia Histochemica et Cytobiologica

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1985

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tom 23

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nr 1-2

15

Inhibitory effect of octyl-phenol and bisphenol A on calcium signaling in cardiomyocyte differentiation of mouse embryonic stem cells

63%

Lee J.-H. , Yoo Y.-M. , Jung E.-M. , Ahn C. , Jeung E.-B.

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tom 70

|

nr 3

16

The influence of E2 and P4 on in vitro NOx production in the porcine myometrium during first half of pregnancy

63%

Andronowska A. , Chrusciel M.

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2008

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tom 11

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nr 4

307-313

EN

The aim of the present study was to determine 1) concentrations of NOx in the myometrium of pregnant gilts, and 2) the influence of estradiol-17ß (E2) and/or progesterone (P4) on NOx production by the porcine myometrium on days 5, 10, 15, 20, 25, 30, 35, 40 and 60 of pregnancy (n = 5 per day). Total NOx concentrations were determined using a microplate assay method based on the Griess reaction. During the first 60 days of gestation, a triphasic pattern in the concentration of NOx in the porcine myometrium was observed with a peak on days 10-15, 30 and 60 of gestation. We also demonstrated the stimulatory effect of E2 and/or P4 on in vitro NO production by the porcine myometrium. The stimulatory effect of steroid hormones on NOx release depended on the treatment dose of steroids and day of pregnancy. These data suggest that locally produced NO may inhibit spontaneous uterine contraction and therefore is involved in the maintenance of myometrial quiescence during pregnancy.

17

Effect of the gonadotrophins treatment on morphological alterations in ovary and peripheral plasma concentrations of steroid hormones in gilts

63%

Kucharski J. , Jana B. , Zezula-Szpyra A.

Polish Journal of Veterinary Sciences

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2002

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tom 05

|

nr 1

18

Hormonal profile and morphological changes in pig ovaries after intraovarian infusions of Escherichia coli endotoxin

63%

Kucharski J. , Jana B. , Zezula-Szpyra A.

Polish Journal of Veterinary Sciences

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2002

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tom 05

|

nr 1

19

Stimulation of generative development in partly vernalized winter wheat by animal sex hormones

63%

Janeczko A. , Filek W.

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tom 24

|

nr 3

20

Abilities of Sclerophoma pythiophila and Epithyrium resinae cultures to transform steroid hormones and their esters

63%

Brzezowska E. , Dmochowska-Gladysz J. , Kowalski T.

Acta Scientiarum Polonorum. Biotechnologia

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2005

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tom 04

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nr 1-2