Search Results - "Zieba, D."

Roles of leptin and resistin in metabolism, reproduction, and leptin resistance by Zieba, D.A., Biernat, W., Barć, J.

“…Increased adipose mass can cause insulin resistance and type 2 diabetes mellitus. This phenomenon is related to adipocyte-secreted signaling molecules that…”
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Phenomenon of leptin resistance in seasonal animals: the failure of leptin action in the brain by Szczesna, M., Zieba, D.A.

“…The core of the leptin resistance hypothesis promulgated several years ago to explain obesity as a result of environmental causes consists of 2 tenets: the…”
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Assessing the usefulness of mineral licks containing herbal extracts with anti-parasitic properties for the control of gastrointestinal helminths in grazing sheep – a field trial by Nosal, P., Murawski, M., Bartlewski, P. M., Kowal, J., Skalska, M., Zięba, D. A

“…One of the alternative methods of parasite control, of particular importance in sustainable farming, is the use of medicinal plants. The specific aim of the…”
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Effects of ghrelin on nocturnal melatonin secretion in sheep: An in vitro and in vivo approach by Kirsz, K, Szczesna, M, Molik, E, Zieba, D A

“…Recent studies confirmed that pineal melatonin (MEL) secretion is regulated by ghrelin (GHRL) in seasonally reproductive sheep. The first in vivo experiment…”
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Regulatory roles of leptin in reproduction and metabolism: A comparative review by Zieba, D.A., Amstalden, M., Williams, G.L.

“…Leptin plays an important role in signaling nutritional status to the central reproductive axis of mammals and appears to be at least a permissive factor in…”
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Seasonal effects of central leptin infusion and prolactin treatment on pituitary SOCS-3 gene expression in ewes by Szczesna, M, Zieba, D A, Klocek-Gorka, B, Misztal, T, Stepien, E

“…Suppressors of cytokine signalling (SOCS) negatively regulate cytokine-induced signalling pathways and may be involved in leptin and prolactin (PRL)…”
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Is progesterone the key regulatory factor behind ovulation rate in sheep? by Bartlewski, P.M., Sohal, J., Paravinja, V., Baby, T., Oliveira, M.E.F., Murawski, M., Schwarz, T., Zieba, D.A., Keisler, D.H.

“…Ovarian antral follicles in the ewe grow in an orderly succession, producing 3 to 4 waves per estrous cycle. In prolific sheep, some large antral follicles…”
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Effects of cell storage and passage on basal and oxytocin-regulated prostaglandin secretion by equine endometrial epithelial and stromal cells by Szóstek, A.Z., Siemieniuch, M.J., Galvão, A.M., Lukasik, K., Zieba, D., Ferreira-Dias, G.M., Skarzynski, D.J.

“…Cell cultures are useful for determining the responses of specific cell types to various factors under controlled conditions and for obtaining a better…”
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Influence of season and nutritional status on the direct effects of leptin, orexin-A and ghrelin on luteinizing hormone and growth hormone secretion in the ovine pituitary explant model by Kirsz, K., Szczesna, M., Dudek, K., Bartlewski, P.M., Zieba, D.A.

“…The aim of this study was to examine whether leptin (anorexigenic peptide), orexin-A, and ghrelin (orexigenic peptides) could directly (ie, independently of…”
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Seasonal changes in the interactions among leptin, ghrelin, and orexin in sheep by Kirsz, K, Szczesna, M, Molik, E, Misztal, T, Wojtowicz, A K, Zieba, D A

“…The adaptation of the physiology of an animal to changing conditions of light and food availability is evident at the behavioral and hormonal levels…”
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Seasonal effects of central leptin infusion on secretion of melatonin and prolactin and on SOCS-3 gene expression in ewes by Zieba, D A, Szczesna, M, Klocek-Gorka, B, Molik, E, Misztal, T, Williams, G L, Romanowicz, K, Stepien, E, Keisler, D H, Murawski, M

“…Recent studies have demonstrated photoperiodic changes in leptin sensitivity of seasonal mammals. Herein, we examined the interaction of season (long days (LD)…”
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Uptake of atmospheric hydrogen by soils: a case study from southern Poland by Bartyzel, J., Necki, J. M., Zieba, D., Rozanski, K., Gasiorek, M.

“…Summary Uptake of atmospheric hydrogen by soils constitutes the most important sink of this gas at the global scale. However, little is known about the…”
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Seasonal changes in the interactions among leptin, ghrelin, and orexin in sheep1 by Kirsz, K., Szczesna, M., Molik, E., Misztal, T., Wojtowicz, A. K., Zieba, D. A.

“…The adaptation of the physiology of an animal to changing conditions of light and food availability is evident at the behavioral and hormonal levels…”
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Effects of orexigenic peptides and leptin on melatonin secretion during different photoperiods in seasonal breeding ewes: An in vitro study by Zieba, D.A., Kirsz, K., Molik, E., Romanowicz, K., Wojtowicz, A.K.

“…The pineal gland (PG) acts as a neuroendocrine transducer of daily and seasonal time through the nocturnal release of melatonin. Here, we examined the…”
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Regulatory Roles of Leptin at the Hypothalamic-Hypophyseal Axis Before and after Sexual Maturation in Cattle by ZIEBA, D. A, AMSTALDEN, M, MORTON, S, MACIEL, M. N, KEISLER, D. H, WILLIAMS, G. L

“…Studies assessed, either directly or indirectly, the role of GnRH in leptin-mediated stimulation of LH release in cattle before and after sexual maturation. In…”
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Effects of leptin on basal and GHRH-stimulated GH secretion from the bovine adenohypophysis are dependent upon nutritional status by Zieba, DA, Amstalden, M, Morton, S, Gallino, JL, Edwards, JF, Harms, PG, Williams, GL

“…We have shown recently that leptin modulates at least two aspects of anterior pituitary LH release in ruminants: basal and GnRH-mediated release. To test the…”
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Leptin as a nutritional signal regulating appetite and reproductive processes in seasonally-breeding ruminants by Zieba, D A, Szczesna, M, Klocek-Gorka, B, Williams, G L

“…Photoperiod and nutrition both exert major influences on reproduction. Thus, it seems axiomatic that seasonal rhythms in ovulation are influenced by nutrition…”
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Leptin Prevents Fasting-Mediated Reductions in Pulsatile Secretion of Luteinizing Hormone and Enhances Its Gonadotropin-Releasing Hormone-Mediated Release in Heifers by MACIEL, M. N, ZIEBA, D. A, AMSTALDEN, M, KEISLER, D. H, NEVES, J. P, WILLIAMS, G. L

“…We tested the hypothesis that leptin could prevent fasting-mediated reductions in pulsatile secretion and modify GnRH-mediated release of LH in heifers…”
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Chronic administration of recombinant ovine leptin in growing beef heifers: Effects on secretion of LH, metabolic hormones, and timing of puberty by Maciel, M.N, Zieba, D.A, Amstalden, M, Keisler, D.H, Neves, J.P, Williams, G.L

“…Serum concentrations of leptin increase linearly from approximately 16 wk before until the week of pubertal ovulation in beef heifers. To test the hypothesis…”
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The effect of the diversified signal of melatonin on milk yields in seasonally breeding sheep by Molik, E, Pasternak, M, Blasiak, M, Misztal, T, Romanowicz, K, Zieba, D

“…Previous studies demonstrated that milk yields in sheep displaying strong seasonal sexual activity depend on the day length. The objective of the studies was…”
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