Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2025Scopus SJRQ1ADAMTS-1, a multifunctional proteinase, in the uterus of both estrous cycle rats and ovariectomized rats can be regulated via hormones
Parlak Ak, Tuba; Yaman, Mine; Bayrakdar, Ali; Bulmus, Ozgur
Remodeling of the extracellular matrix (ECM) throughout the estrous cycle is one of the most striking features of the uterus. A disintegrin and metalloprotease with thrombospondin type I motifs (ADAMTS-1) is a metalloproteinase responsible for the degradation of some proteoglycans, which are ECM components. In this study, ADAMTS-1 distribution was analyzed in the uterus of ovariectomized rats administered 17β-estradiol (E2) and progesterone (P4) and in the uterus at different estrous stages. Ovariectomized (OVX) rats were subjected to single and combined E2 (0.2 mg/kg) and P4 (10 mg/kg) hormone replacement therapies. E2 was administered for 3 consecutive days, followed by E2, P4, or E2 + P4 for 4 consecutive days. The serum level of E2 decreased from the proestrus phase to the diestrus phase, but that of P4 was the highest in the estrus phase. During the estrus phase, the serum level of luteinizing hormone (LH) was the lowest and that of follicle-stimulating hormone (FSH) was the highest. P4 level increased significantly in the OVX + P4 and OVX + E2 + P4 groups compared with the OVX group. The serum levels of LH and FSH decreased in the OVX + E2 and OVX + P4 groups compared with the OVX group, and were the lowest in the OVX + E2 + P4 group. ADAMTS-1 immunoreactivity in luminal, glandular, and stromal cells of the uterus decreased from proestrus to diestrus. When immunoreactivity in hormone replacement groups was compared, weak immunoreactivity was observed in the OVX group. ADAMTS-1 immunoreactivity gradually increased in OVX + P4 and OVX + E2 groups, and was particularly notable in luminal, glandular, and stromal cells in the OVX + E2 + P4 group. ADAMTS-1 distribution was affected by the estrous cycle process and hormone replacement therapy in the OVX procedure.
AtıfScopus1OpenAlex1
İncele - MakaleYalnız künye2023Östrüs Siklusu Boyunca Sıçan Ovaryumunda ADAMTS-1 Metalloproteinazının Dağılımı
Parlak Ak, Tuba; Yaman, Mine; Bayrakdar, Ali; Bulmus, Ozgur
A Disintegrin and Metalloproteinase with Thrombospondins Motifs 1 (ADAMTS-1), ovaryumdaki foliküler gelişim sırasında folikül bütünlüğünü ve işlevselliğini sürdürmek amacıyla yeniden şekillenmede rol oynayan bir metalloproteinazdır. Bu çalışmada, dişi sıçanların farklı östrüs siklusu evrelerindeki ovaryum dokularında ADAMTS-1 immünolokalizasyonu incelendi. Vajinal smear yöntemi ile düzenli siklus gösteren hayvanlar tercih edilerek 18 adet Wistar Albino cinsi sıçan; proöstrüs (Grup I), östrüs (Grup II) ve diöstrüs (Grup III) olmak üzere üç gruba ayrıldı. Proöstrüs evresinde; folikül epitel hücreleri, teka hücreleri, lüteal hücreler ve intersitisyel hücrelerde yoğun ADAMTS-1 immünoreaktivitesi gözlendi. Östrüs evresinde, proöstrüs evresine göre bu ovarian hücrelerde daha az yoğun ADAMTS-1 immünoreaktivitesi belirlendi. Diöstrüs evresinde, boyama yoğunluğunun foliküler hücreler ile teka hücrelerinde östrüs evresine benzer olduğu, lüteal ve intersitisyel hücrelerde ise daha hafif olduğu saptandı. Histoskor verilerine göre, ADAMTS-1 immünoreaktivitesinin proöstrüs evresinde (2.84±0.13) östrüs (1.18±0.07) ve diöstrüs (1.08±0.10) evrelerine göre en yüksek değere (P<0.05) ulaştığı tespit edildi. Sonuç olarak; foliküler gelişim, ovülasyon ve regresyon süreçlerini içeren farklı siklus evrelerinin ekstrasellüler matriksindeki (ESM) yapısal değişikliklerle ilişkili olarak ADAMTS-1 immünoreaktivitesinde farklılıklar belirlendi.
- MakaleAçık Erişim2023Scopus SJRQ2Expression of phoenixin-14 and nesfatin-1 in the hypothalamo–pituitary–gonadal axis in the phases of the estrous cycle
Parlak Ak, Tuba; Yaman, Mine; Bayrakdar, Ali; Bulmus, Ozgur
Phoenixin-14 (PNX-14) and nucleobindin 2 (NUCB2)/nesfatin-1 are regulatory neuropeptides expressed in the hypothalamus. These neuropeptides can be effective in hormonal regulation of the hypothalamo–pituitary–gonadal (HPG) axis and reproductive functions. In the present study, the distribution of PNX-14 and NUCB2/nesfatin-1 in the hypothalamus, pituitary, ovary, and uterus tissues during the phases of the estrous cycle in female rats was investigated. Eighteen Wistar Albino rats determined among animals showing regular estrous cycle by vaginal smear method were divided into three groups: proestrus (Group I), estrus (Group II) and diestrus (Group III). Serum gonadotropin-releasing hormone (GnRH), plasma PNX-14, and NUCB2/nesfatin-1 concentrations were the highest, moderate, and lowest in estrus, diestrus, and proestrus phases, respectively. PNX-14 immunoreactivity in the supraoptic and arcuate nuclei of the hypothalamus and NUCB2/nesfatin-1 immunoreactivity in the paraventricular nuclei were particularly evident in the estrus phase. These neuropeptide immunoreactivities were decreased in different cells of anterior pituitary during proestrus compared with those during estrus and diestrus. PNX-14 immunoreactivity in the ovary, especially during the estrus phase, was diffuse and intense in the granulosa and luteal cells and oocytes, and it was few and weak in theca cells. In addition, NUCB2/nesfatin-1 immunoreactivity was abundant and strong in granulosa and luteal cells, theca and interstitial cells, and oocytes during estrus. In the estrus phase, PNX-14 immunoreactivity was strong in the glandular epithelial cells and stromal cells of the endometrium, also NUCB2/nesfatin-1 immunoreactivity was strong in the epithelial and glandular epithelial cells. As a result, when the estrous cycle was evaluated, it was concluded that the changes in the distribution of PNX-14 and NUCB2/nesfatin-1 at all phases were related to GnRH and that these neuropeptides showed the highest immunoreactivity especially in the HPG axis and uterus tissues of estrus rats.
AtıfScopus21OpenAlex22İncele - MakaleAçık Erişim2011Scopus SJRQ2Distribution of neuropeptides in endocrine and exocrine pancreas of long-legged buzzard (Buteo rufinus): An immunohistochemical study
Bayrakdar, Ali; Yaman, Mine; Atalar, Omer; Tarakci, Berrin Gencer; Ceribasi, Songul
This study aimed to determine the existence and distribution of certain neuropeptides in endocrine and exocrine pancreas of the long-legged buzzard by using immunohistochemical methods. SOM-14-, NPY- and CGRP-IR endocrine cells were determined in both central and peripheral regions in A-islets within the pancreas, while SP-IR endocrine cells were found only in the central region, and CCK-8- and galanin-IR endocrine cells were only detected in peripheral region. On the other hand, in B-islets; SP-, NPY- and CGRP-IR endocrine cells were determined in both central and peripheral regions, while SOM-14- CCK-8- and galanin-IR endocrine cells were found only in the peripheral region. In addition; SOM-14-, NPY-, CGRP-. CCK-8- and galanin-IR cells were also observed in exocrine pancreas. This distribution pattern in the pancreas of the long-legged buzzard demonstrates that neuropeptides perform their probable affects through endocrine and/or paracrine mechanisms. In conclusion, the existence and distribution of neuropeptides in the pancreas of long-legged buzzard have been introduced in this study for the first time and this bird species has also been found to differ from other types of avian species. (c) 2010 Elsevier B.V. All rights reserved.
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