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Tytuł:
Electron beam sterilization of implantable rods with risperidone and with 17-β-estradiol: a structural, thermal and morphology study
Autorzy:
Wilińska, Justyna
Turek, Artur
Borecka, Aleksandra
Rech, Jakub
Kasperczyk, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/306226.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sterylizacja wiązką elektronów
17β-estradiol
rysperydon
electron beam sterilization
implantable rods
poly(L-lactide-co-glycolide-co-trimethylene carbonate)
risperidone
17-β-estradiol
Opis:
Poly(L-lactide-co-glycolide-co-trimethylene carbonate) rods with risperidone and 17-β-estradiol were sterilized by electron beam irradiation. The aim of the study was to assess electron beam irradiation impact on terpolymer composition, chain microstructure, glass transition temperature, molecular weight and the morphological features of rods. Methods: Hot melt extrusion in the formulation of rods was applied. Sterilization of the rods was performed by electron beam in an electron beam accelerator (10 MeV, 360 mA, 25 kGy). The following methods in the development of rods were applied: nuclear magnetic resonance, differential scanning calorimetry, gel permeation chromatography and scanning electron microscopy. Results: Sterilization influenced only glass transition temperature in blind rods and rods with risperidone. As for the other parameters, no significant changes were observed as far as a sterilization effect is concerned. However, some changes were noted after introducing drug substances and after extrusion. Conclusions: Electron beam irradiation of rods with risperidone and rods with 17-β-estradiol is an adequate method for sterilizing implantable drug delivery systems.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 3; 39-47
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural phenolic acids may increase serum estradiol level in ovariectomized rats
Autorzy:
Zych, Maria
Folwarczna, Joanna
Trzeciak, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1040548.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
rat
estradiol
p-coumaric acid
chlorogenic acid
body mass
caffeic acid
ferulic acid
Opis:
Natural phenolic acids are commonly present in plants consumed in the diet. Recently we have observed that different natural phenolic acids exert differential effects on the body mass gain in ovariectomized and non-ovariectomized female rats. The aim of the present study was to investigate the effects of ferulic, caffeic, p-coumaric and chlorogenic acids on serum estradiol and total cholesterol levels in ovariectomized and non-ovariectomized rats. The experiments were carried out on 3-month old female Wistar Cmd:(WI)WU rats, divided into following groups (n=8 in each group): non-ovariectomized control rats and non-ovariectomized rats receiving ferulic, caffeic, p-coumaric or chlorogenic acids, sham-operated control rats, ovariectomized control rats and ovariectomized rats receiving the same phenolic acids. The phenolic acids were administered at a dose of 10 mg/kg p.o. daily for 4 weeks. Serum estradiol and total cholesterol levels on the next day after the last administration of the phenolic acids were examined. The phenolic acids did not affect serum estradiol or total cholesterol levels in non-ovariectomized rats. In ovariectomized rats, caffeic acid and to a lesser extent p-coumaric acid increased serum estradiol level, which effect correlated with a decreased body mass gain. All the phenolic acids decreased serum cholesterol level in ovariectomized rats. Concluding, the anti-obesity activity of some phenolic acids may be, at least partially, connected with estrogenic pathways.
Źródło:
Acta Biochimica Polonica; 2009, 56, 3; 503-507
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific binding sites for progesterone and 17β-estradiol in cells of Triticum aestivum L.
Autorzy:
Janeczko, Anna
Budziszewska, Bogusława
Skoczowski, Andrzej
Dybała, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1040676.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
vernalization
progesterone
radioligand binding assay
Triticum aestivum L.
17β-estradiol
Opis:
The presence and location of specific binding sites for progesterone and 17β-estradiol in cells of wheat were estimated using radioligand binding assay. Membrane and cytosolic fractions of non-vernalized and vernalized plants were tested using tritium-labelled ligands. Specific binding of [3H]progesterone and [3H]17β-estradiol occurs in wheat cells. The binding sites are located in membranes and in the cytosol. Specific binding of [3H]17β-estradiol is higher in the membranes than in the cytosol. Specific binding of both ligands in the cytosolic fraction is higher in vernalized plants than in non-vernalized ones. The possibility of the occurrence of steroid binding proteins specific for progesterone and 17β-estradiol, putative steroid receptors for these steroids in Triticum aestivum L., is discussed.
Źródło:
Acta Biochimica Polonica; 2008, 55, 4; 707-711
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany w strukturze mikroskopowej jajników suk po podaniu estradiolu
Changes in ovaries microscopic structure after estradiol administration in bitches
Autorzy:
Katkiewicz, M.
Jurka, P.
Powiązania:
https://bibliotekanauki.pl/articles/861569.pdf
Data publikacji:
2018
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Tematy:
psy
suki
estradiol
benzoesan estradiolu
podawanie domiesniowe
jajniki
struktura mikroskopowa
histopatologia
Źródło:
Życie Weterynaryjne; 2018, 93, 01
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in selected neuroendocrine and immunological markers during exercise
Autorzy:
Grzebisz, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/1192059.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cortisol
catecholamines
estradiol
exercise
Opis:
Physical exercise has multidirectional impact on the mechanisms of neuroendocrine responses. The regular and moderate stimulates the immune mechanism, whereas the interval may lead to increased susceptibility to infections. In recent years there has been increased interest in the issues of the impact of exercise on the efficiency of the immune mechanisms. In practice, such knowledge may be used to prevent infections in athletes and possible states of overtraining. Among the signaling molecules involved in the immune response of the body to exercise mentioned markers hormonal balance (testosterone, cortisol, estradiol, hormones, pituitary and hypothalamus), the metabolism of proteins and amino acids (balance nitrogen, glutamine, increase in creatine kinase). Review of the current state of knowledge about the change of levels of markers of hormonal system during exercise and suggestions direction of future research in the area of these issues have been taken in this paper. This is a translation of a part of my authorship the original source in Polish ,,Zarządzanie zmianami poziomu wybranych markerów neuroendokrynnych oraz immunologicznych podczas wysiłku fizycznego”. The text was published in an edition of the Scientific Publishing Sophia in 2015.
Źródło:
World Scientific News; 2016, 50; 239-249
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of the effects of genistein, estradiol and raloxifene on the murine skeletal system
Autorzy:
Śliwiński, Leszek
Folwarczna, Joanna
Nowińska, Barbara
Cegieła, Urszula
Pytlik, Maria
Kaczmarczyk-Sedlak, Ilona
Trzeciak, Hanna
Trzeciak, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1040583.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
bone mechanical properties
estradiol
osteoclasts
bone mineralization
osteoblasts
genistein
raloxifene
Opis:
Genistein, a major phytoestrogen of soy, is considered a potential drug for prevention and treatment of postmenopausal osteoporosis. The aim of the present study was to compare the effects of genistein, estradiol and raloxifene on the skeletal system in vivo and in vitro. Genistein (5 mg/kg), estradiol (0.1 mg/kg) or raloxifene hydrochloride (5 mg/kg) were administered daily by a stomach tube to mature ovariectomized Wistar rats for 4 weeks. Bone mass, mineral and calcium content, macrometric parameters and mechanical properties were examined. Also the effects of genistein, estradiol and raloxifene (10-9-10-7 M) on the formation of osteoclasts from neonatal mouse bone marrow cells and the activity of osteoblasts isolated from neonatal mouse calvariae were compared. In vivo, estrogen deficiency resulted in the impairment of bone mineralization and bone mechanical properties. Raloxifene but not estradiol or genistein improved bone mineralization. Estradiol fully normalized the bone mechanical properties, whereas genistein augmented the deleterious effect of estrogen-deficiency on bone strength. In vitro, genistein, estradiol and raloxifene inhibited osteoclast formation from mouse bone marrow cells, decreasing the ratio of RANKL mRNA to osteoprotegerin mRNA expression in osteoblasts. Genistein, but not estradiol or raloxifene, decreased the ratio of alkaline phosphatase mRNA to ectonucleotide pyrophosphatase phosphodiesterase 1 mRNA expression in osteoblasts. This difference may explain the lack of genistein effect on bone mineralization observed in ovariectomized rats in the in vivo study. Concluding, our experiments demonstrated profound differences between the activities of genistein, estradiol and raloxifene towards the osseous tissue in experimental conditions.
Źródło:
Acta Biochimica Polonica; 2009, 56, 2; 261-270
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can transforming growth factor-β1 and retinoids modify the activity of estradiol and antiestrogens in MCF-7 breast cancer cells?
Autorzy:
Czeczuga-Semeniuk, Ewa
Anchim, Tomasz
Dzięcioł, Janusz
Dąbrowska, Milena
Wołczyński, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1041552.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
estradiol
apoptotic index
tamoxifen
TGF-β1
proliferation
MCF-7
retinoids
Opis:
Retinoic acid and transforming growth factor-β (TGF-β) affect differentiation, proliferation and carcinogenesis of epithelial cells. The effect of both compounds on the proliferation of cells of the hormone sensitive human breast cancer cell line (ER+) MCF-7 was assessed in the presence of estradiol and tamoxifen. The assay was based on [3H]thymidine incorporation and the proliferative activity of PCNA- and Ki 67-positive cells. The apoptotic index and expression of the Bcl-2 and p53 antigens in MCF-7 cells were also determined. Exogenous TGF-β1 added to the cell culture showed antiproliferative activity within the concentration range of 0.003-30 ng/ml. Irrespective of TGF-β1 concentrations, a marked reduction in the stimulatory action of estradiol (10-9 and 10-8 M) was observed whereas in combination with tamoxifen (10-7 and 10-6 M) only 30 ng/ml TGF-β1 caused a statistically significant reduction to aproximately 30% of the proliferative cells. In further experiments we examined the effect of exposure of breast cancer cells to retinoids in combination with TGF-β1. The incorporation of [3H]thymidine into MCF-7 cells was inhibited to 52 ± 19% (control =100%) by 3 ng/ml TGF-β1, and this dose was used throughout. It was found that addition of TGF-β1 and isotretinoin to the culture did not decrease proliferation, while TGF-β1 and tretinoin at low concentrations (3 × 10-8 and 3 × 10-7 M) reduced the percentage of proliferating cells by aproximately 30% (67±8% and 67±5%, P <0.05 compared to values in the tretinoin group). Both retinoids also led to a statistically significant decrease in the stimulatory effect of 10-9 M estradiol, attenuated by TGF-β1. In addition, the retinoids in combination with TGF-β1 and tamoxifen (10-6 M) caused a further reduction in the percentage of proliferating cells. Immunocytochemical analysis showed that all the examined compounds gave a statistically significant reduction in the percentage of cells with a positive reaction to PCNA and Ki 67 antigen. TGF-β1, isotretinoin and tretinoin added to the culture resulted in the lowest percentage of PCNA positive cells. However, the lowest fraction of Ki 67 positive cells was observed after addition of isotretinoin. The obtained results also confirm the fact that the well-known regulatory proteins Bcl-2 and p53 play an important role in the regulation of apoptosis in the MCF-7 cell line, with lowered Bcl-2 expression accompanying easier apoptotic induction. The majority of the examined compounds act via the p53 pathway although some bypass this important proapoptotic factor.
Źródło:
Acta Biochimica Polonica; 2004, 51, 3; 733-745
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The level of endogenous DNA damage in lymphocytes isolated from blood is associated with the fluctuation of 17β-estradiol concentration in the follicular phase of healthy young women.
Autorzy:
Kapiszewska, Maria
Kalemba, Malgorzata
Grzesiak, Aneta
Kocemba, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/1041444.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
endogenous DNA damage
catechol-O-methyltransferase (COMT)
comet assay
17β-estradiol
Opis:
The aim of this study was to evaluate whether the differences in plasma 17β-estradiol concentration in early and late follicular phases of the menstrual cycle can affect the level of endogenous DNA damage in lymphocytes assessed by comet assay, and whether the extent of this damage in the follicular phase is associated with the genotype of catechol-O-methyltransferase (COMT). The level of DNA damage was positively correlated with 17β-estradiol concentration only in the late follicular phase. Subjects with the COMT L/L homozygous mutated variant revealed more DNA damage as compared to individuals with the COMT wild-type and heterozygous (H/L+HH) genotype.
Źródło:
Acta Biochimica Polonica; 2005, 52, 2; 535-539
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estradiol reduces connexin43 gap junctions in the uterus during adenomyosis in cows
Autorzy:
Korzekwa, A.J.
Lupicka, M.
Socha, B.M.
Szczepanska, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/31714.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Adenomyosis is defined as the presence of glandular foci external to the endometrium of the uterus, either in the myometrium or/and perimetrium, depending on the progress of this dysfunction. To date, we showed that steroids secretion and prolactin expression and proliferative processes are disturbed during uterine adenomyosis in cows. During endometriosis in eutopic endometrium in women, gap junctions are down regulated. The transmembrane gap junction protein, connexin (Cx43) is necessary for endometrial morphological, biochemical and angiogenic functions. The aim of this study is recognition of adenomyosis etiology by determination of the role of Cx43 in this process. Immunolocalization and comparison of Cx43 mRNA and protein expression in healthy (N=9) and adenomyotic uterine tissue (N=9), and Cx43 mRNA expression (real time PCR) in uterine stromal – myometrium co-culture under 24-hour stimulation with 17-beta estradiol (10−7M) isolated from healthy (N=5) and adenomyotic (N=5) cows were determined. Cx43 was localized in healthy and adenomyotic uteri. mRNA and protein expression was down-regulated in uterine tissue in adenomyotic compared with healthy cows (p<0.05). Estradiol stimulated Cx43 mRNA expression in myometrial cell culture and co-culture of stromal and myometrial cells in adenomyotic compared with healthy cows (p<0.05). In summary, down-regulation of Cx43 expression in the junction zone might play an important role in pathogenesis of adenomyosis. Estradiol modulates gap junctions during adenomyosis.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modulation of hepatic chromatin structure in response to 17-β estradiol induced of the vitellogenin gene regions in Atlantic salmon, Saimo salar
Autorzy:
von der Decken, Alexandra
Waters, Sean
Powiązania:
https://bibliotekanauki.pl/articles/1045494.pdf
Data publikacji:
1993
Wydawca:
Polskie Towarzystwo Biochemiczne
Źródło:
Acta Biochimica Polonica; 1993, 40, 1; 23-28
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
17 beta-estradiol affects proliferation and apoptosis of canine bone marrow mesenchymal stem cells in vitro
Autorzy:
Zhou, Z.-H.
Gu, C.-W.
Li, J.
Huang, X.-Y.
Deng, J.-Q.
Shen, L.-H.
Cao, S.-Z.
Deng, J.-L.
Zuo, Z.-C.
Wang, Y.
Ma, X.-P.
Ren, Z.-H.
Yu, S.-M.
Powiązania:
https://bibliotekanauki.pl/articles/2087308.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
apoptosis
bone marrow mesenchymal stem cells (BMSCs)
canine
proliferation
17 beta-estradiol (E2)
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 2; 235-245
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oocyte hydration in round goby Neogobius melanostomus from the Gulf of Gdańsk: another invasive strategy?
Autorzy:
Kalamarz-Kubiak, H.
Guellard, T.
Powiązania:
https://bibliotekanauki.pl/articles/47646.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
oocyte
hydration
round goby
Neogobius melanostomus
non-native species
estradiol
Gdansk Gulf
Źródło:
Oceanologia; 2019, 61, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena wpływu nanocząstek platyny na steroidogenezę na podstawie oznaczania poziomu testosteronu i 17β-estradiolu w komórkach Leydiga (R2C)
Evaluation of platinum nanoparticles effect on steroidogenesis based on the determination of testosterone and 17β-estradiol levels in Leydig cells (R2C)
Autorzy:
Zapór, Lidia
Skowroń, Jolanta
Miranowicz-Dzierżawska, Katarzyna
Choknacka-Puchta, Luiza
Sawicka, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/23352093.pdf
Data publikacji:
2023
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
nanocząstki platyny
testosteron
17β-estradiol
komórki Leydiga (R2C)
platinum nanoparticles
testosterone
Opis:
Coraz popularniejsze zastosowanie nanocząstek platyny (Pt-NPs) powoduje, że mogą one systematycznie uwalniać się do środowiska, przede wszystkim do powietrza (w tym powietrza środowiska pracy), ale także do wody, ścieków i gleby, zarówno z procesów produkcyjnych, jak i podczas ich przetwarzania i stosowania oraz w wyniku utylizacji odpadów. Dane dotyczące toksyczności Pt-NPs są ograniczone. Biorąc pod uwagę zdolność Pt-NPs do bioakumulacji w organizmach żywych, ważne jest poznanie długotrwałych skutków narażenia, jakim jest wpływ na funkcje rozrodcze, w tym produkcję hormonów (testosteronu i 17β-estradiolu). Celem pracy była ocena wpływu Pt-NPs na sekrecję hormonów steroidowych w komórkach Leydiga. W komórkach Leydiga linii R2C pochodzących z jąder szczura oceniano działanie cytotoksyczne Pt-NPs <50 nm, badając ich wpływ na aktywność metaboliczną komórek (test MTT) oraz uszkodzenie błon komórkowych (test NRU). Zaburzenia steroidogenezy w komórkach oceniano poprzez oznaczanie sekrecji testosteronu (T) i 17β-estradiolu (E2), stosując kompetencyjny test ELISA. Pt-NPs działały cytotoksycznie na komórki R2C zależnie od stężenia, ale efekt ten był widoczny tylko w teście MTT (zmniejszenie przeżywalności komórek o 50% notowano przy stężeniach powyżej 250 μg/ml). Pt-NPs w stężeniach nie działających cytotoksycznie (8 ÷ 125 μg/ml) powodowały zwiększenie sekrecji T i E2 w porównaniu z kontrolą. Stężenie E2 utrzymywało się na poziomie porównywalnym z działaniem induktora (forskoliny). Uzyskane wyniki, chociaż mają charakter przesiewowy, mogą wskazywać na potencjalne działanie modulujące proces steroidogenezy w gonadach pod wpływem Pt-NPs.
Due to the increasingly popular application of platinum nanoparticles (Pt-NPs), they can be continuously released to the environment, mainly to the air (including the air in the working environment), but also to water, wastewater and soil, both from production processes, during their processing and use, and as a result of waste disposal. Pt-NPs toxicity data are limited. Given the ability of Pt-NPs to bioaccumulate in living organisms, it is important to know the long-term effects of exposure, such as the impact on reproductive functions, including hormone (testosterone and 17β-estradiol) production. The aim of this study was to assess the effect of Pt-NPs on steroid hormone secretion in Leydig cells. Cytotoxicity of Pt-NPs < 50 nm was assessed in the R2C Leydig cell line derived from rat testicles by examining their effects on cellular metabolic activity (MTT assay) and cell membrane damage (NRU assay). Abnormalities of steroidogenesis in cells were evaluated by determination of testosterone (T) and 17β-estradiol (E2) secretion with the competitive ELISA test. Pt-NPs exerted a cytotoxic effect on R2C cells depending on the concentration, but this effect was seen only in the MTT assay (50% reduction in cell survival was noted at concentrations above 250 µg/ml). Pt-NPs at non-cytotoxic concentrations (8–125 µg/ml) increased the secretion of T and E2 as compared with control. The E2 concentration was maintained at a level comparable to the effect of an inducer (forskolin). The results, yet having a screening nature, may indicate a potential steroidogenesis-modulating effect of Pt-NPs in gonads.
Źródło:
Podstawy i Metody Oceny Środowiska Pracy; 2023, 2 (116); 5--28
1231-868X
Pojawia się w:
Podstawy i Metody Oceny Środowiska Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The pattern of steroid secretion by perifused preovulatory rat follicles
Autorzy:
Szoltys, M
Powiązania:
https://bibliotekanauki.pl/articles/70002.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
radioimmunoassay
steroid production
progesterone
rat follicle
steroid
endocrinology
steroid analysis
ovulation
androgen
animal physiology
gonadotrophin
hormone free
secretion
estradiol
Źródło:
Journal of Physiology and Pharmacology; 1995, 46, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of vaginal administration of prostaglandin E2 and/or 17Betta-estradiol on luteal function and histological characteristics of the cervix in cyclic pigs
Autorzy:
Przygrodzka, E.
Andronowska, A.
Janowski, T.
Ziecik, A.J.
Powiązania:
https://bibliotekanauki.pl/articles/31436.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The overall objective of this study was to examine the effect of vaginal administration of prostaglandin E₂ (PGE₂) and/or17β-estradiol (E₂) on luteal function maintenance and histological properties of the porcine cervix. For this purpose, crossbred gilts were divided into three groups (n=5 per group) supplied on days 11-16 of the estrous cycle with suppositories containing: (1) placebo (Group I, Control); (2) 0.4 mg of E₂ (Group II); (3) 0.4 mg of E₂ and 2 mg of PGE₂ (Group III). Blood samples were collected on days 11-19 of the estrous cycle to determine the concentration of progesterone (P₄). Additionally, to examine local effects of the hormones applied, segments from the uterine and vaginal parts of the cervix and from the ovaries were collected post-mortem. Prolonged luteal function and extended synthesis of P₄ were observed in 2 of 5 gilts receiving PGE₂ and E₂ simultaneously (Group III). Then, these gilts were subdivided into Group IIIA (n=2; presence of corpora lutea on the ovaries) and Group IIIB (n=3; lack of corpora lutea). Increased levels of plasma P₄ were observed in Group IIIA on days 15-19 compared to Group IIIB and on days 16-19 compared to Group I and Group II (P<0.05; P<0.01; P<0.001, respectively). In the cervix of gilts in Groups II and III, enlarged blood vessels in the lamina propria of both parts of the cervix were observed. Furthermore, in Group II the epithelium of the uterine part of the cervix was thicker (P<0.001). Our study confirmed the proposed luteotrophic/antiluteolytic actions of E₂ and PGE₂ applied intravaginally. These results are significant considering that very low doses of E₂ were used when compared to previous attempts. Despite the inadequate response to treatments in some of the gilts, the local effects of these hormones on the histological properties of the porcine cervix suggest that further improvements in the vaginal administration route might help to elaborate new methods for enhancing the luteal function in the pig.
Źródło:
Polish Journal of Veterinary Sciences; 2014, 17, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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