Wyniki wyszukiwania - Biblioteka Nauki

1

The effect of catecholamine on PRL secretion from the porcine pituitary in vitro in dependence on estrogen stimulation in vivo

100%

Siawrys G.

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nr 3

2

Direct in vitro effect of LH and steroids on leptin gene expression and leptin secretion by porcine luteal cells during the mid-luteal phase of the estrous cycle

63%

Siawrys G. , Smolinska N.

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nr 3

3

Modulation of anterior pituitary cell luteinizing hormone secretory activity by neuropeptide Y in early pregnant pigs

63%

Siawrys G. , Buchowski H.

Journal of Physiology and Pharmacology

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2018

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tom 69

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nr 5

4

The involvement of catecholamines in the pituitary release of luteinizing hormone [LH] and prolactin [PRL] in progesterone [P4] - treated gilts

63%

Siawrys G. , Przala J.

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1997

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tom 35

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nr 2

5

Ontogeny of the long form of leptin receptor gene expression in the porcine ovarian follicles

51%

Smolinska N. , Kaminski T. , Siawrys G. , Przala J.

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nr 1

6

Ontogeny of the long form of leptin receptor gene expression in the porcine ovarian follicles

51%

Smolinska N. , Kaminski T. , Siawrys G. , Przala J.

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2013

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tom 16

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nr 1

EN

Leptin is a polypeptide hormone produced predominantly in adipocytes. It has been found to be implicated in the regulation of satiety and energy homeostasis. A role for leptin in reproduction was later suggested by findings that this hormone may be involved in the regulation of the hypothalamic- pituitary-gonadal axis via endocrine, paracrine and/or autocrine pathways. The objective of the study was to investigate the ontogeny of the long isoform of leptin receptor (OB-Rb) gene in porcine ovarian follicles. The expression of OB-Rb gene was detected in porcine primordial, primary, secondary and antral follicles by in situ hybridization. In summary, our data suggest that leptin might have a direct effect on porcine follicles and plays an important role in the follicular development.

7

Leptin gene and protein expression in the trophoblast and uterine tissues during early pregnancy and the oestrous cycle of pigs

51%

Smolinska N. , Siawrys G. , Kaminski T. , Przala J.

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nr 3

EN

Leptin is a 16-kDa protein hormone encoded by the obese (ob) gene and acts on receptors in the hypothalamus to regulate food intake and energy balance. The identification of leptin and its receptor mRNAs and proteins in human and mouse endometrium and placental trophoblast has attracted attention to the potential role of leptin in implantation. Thus, the aim of this study was to compare the expression levels of porcine leptin mRNA and protein in endometrium and myometrium during mid- and late-luteal phases of the oestrous cycle (days 10 - 12 and 14 - 16) as well as during two stages of pregnancy respondent to the beginning (days 14 - 16) and the end (days 30 - 32) of the implantation process, and in trophoblast during both periods of pregnancy. Leptin gene and protein expression in myometrium, and leptin mRNA expression in endometrium was more pronounced in the mid- and late-luteal phases of the cycle in comparison to studied periods of pregnancy, whereas leptin protein concentration in endometrium was either enhanced on days 30 - 32 of pregnancy in relation to days 14 - 16 of the cycle or there were no changes between pregnancy and luteal phase of the cycle. On days 30 - 32 of pregnancy, expression of the leptin gene in the endometrium, and of the leptin gene and protein in the myometrium was more pronounced in comparison to the earlier stage of pregnancy. Moreover, leptin gene expression in porcine trophoblast increased during the beginning of the implantation process compared to days 30 - 32 of pregnancy, while the protein concentration decreased on days 14 - 16 of pregnancy. In conclusion, the finding of leptin gene and protein expression in porcine endometrium, myometrium and trophoblast indicates that locally synthesised leptin can participate in the control of pig reproduction. The fluctuation of the hormone concentration during pregnancy and changes in its level between pregnancy and the oestrous cycle may indicate leptin's involvement in the implantation process.

8

Udzial opioidow w lokalnej regulacji funkcji jajnika

45%

Przala J. , Kaminski T. , Okrasa S. , Siawrys G. , Bogacka I.

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1999

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tom 12

113-116

9

Effects of oxytocin alone and in combination with selected hypothalamic hormones on ACTH, beta-endorphin, LH and PRL secretion by anterior pituitary cells of cyclic pigs

32%

Kotwica G. , Staszkiewicz J. , Skowronski M. T. , Siawrys G. , Bogacka J. , Franczak A. , Kurowicka B. , Krazinski B. , Okrasa S.

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2006

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tom 06

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nr 2