Yazar "Akbalik, Mehmet Erdem" seçeneğine göre listele

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    Distribution of cytoskeletal proteins in the cat testis during the pre- pubertal and post-pubertal periods
    (Elsevier Science Inc, 2023) Topaloglu, Ugur; Sagsoz, Hakan; Akbalik, Mehmet Erdem
    Cytoskeletal proteins not only define the shape of cells, but also have critical roles in their proliferation, migration and motility, as well as in the establishment and maintenance of tissue organization and integrity. Furthermore, these proteins influence the physiological processes of the male reproductive system and are found in the structure of some cells. This study aimed to determine differences between the pre-and post-pubertal periods for the localization and distribution of actin, desmin, vimentin and cytokeratin-18 in the testes, epididymides and ductus deferentes of Persian and Turkish Angora and Van cats, using immunohistochemistry. The study material was grouped as belonging to the pre-pubertal and post-pubertal periods. The tissue samples of both groups were subjected to routine histological pro-cessing and embedded in paraffin. Serial sections cut from the paraffin-embedded tissue blocks were immunohistochemically stained with the indirect streptavidin-biotin complex method. Immunohisto-chemical findings demonstrated that there was no difference between the pre-and post-pubertal pe-riods for the staining intensity and distribution of the proteins actin, vimentin, desmin and cytokeratin-18 in Persian and Turkish Angora and Van cats. On the other hand, differences were detected between the pre-and post-pubertal periods for the cellular expression and localization of these proteins in the testes, epididymides and ductus deferentes. Thus, the study results suggest that, based on the expression of actin, desmin, vimentin and cytokeratin-18 in the testes, epididymides and ductus deferentes during both periods, these molecular factors could have a contributory role in the development of the male reproductive system and the regulation of its physiological processes.(c) 2022 Elsevier Inc. All rights reserved.
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    EXPRESSION AND BIOLOGICAL ACTIVITY OF GHRELIN, OBESTATIN, AND LEPTIN IN DEFERENT DUCTS OF THE BULL AND RAM
    (Univ Ljubljana, Veterinary Faculty, 2018) Saruhan, Berna Guney; Erdogan, Serkan; Topaloglu, Ugur; Akbalik, Mehmet Erdem; Bayram, Bayram; Ketani, Muzaffer Aydin; Sagsoz, Hakan
    It is known that ghrelin, obestatin and leptin are involved in many biological processes such as appetite-energy regulation, growth hormone release and cell proliferation. In addition to these biological activities of in human and rodents, direct effects of these hormones on reproductive functions and regulation of smooth muscle contractions have gained importance in recent years. In mammals, gonadal functions are regulated by using a complex network of autocrine, paracrine and endocrine signals. The signals involved in the control of energy balance regulate reproductive functions by acting on different hypothalamic pituitary-gonadal axis. The underlying molecular mechanism of gonad is poorly understood and appears to be controlled on genetic, environmental, and hormonal factors. Ghrelin, obestatin and leptin, three recently discovered hormones, are especially co-expressed in endocrine cells. The purpose of this investigation was to examine the immunohistochemical expression and potential biological activity of bull and ram deferent ducts (DD) in relation to the tissue concentration of ghrelin, obestatin and leptin. Ghrelin, obestatin and leptin expression observed in the DD sections were restricted to the cytoplasm of the epithelial and muscle cells. Both ghrelin and leptin expressions were found in smooth muscle cells in muscular layer of DD and smooth muscle cells of blood vessels, and obestatin expression was found in the basal epithelial cells of the luminal epithelium. In conclusion, ghrelin, obestatin and leptin were expressed in varying concentrations in epithelial and muscle cells as well as blood vessels of the deferent ducts of both species. Given the multifunctional biological roles of these peptide hormones, we can suggest that these hormones function in the contraction and hypertrophy of smooth muscles, proliferation or apoptosis of epithelial and muscle cells in DD.
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    Expression of the Homeobox Proteins Dlx-5 and TLX1 During the Development of Cat Testis
    (Soc Chilena Anatomia, 2022) Topaloglu, Ugur; Akbalik, Mehmet Erdem
    Recent studies have shown that homeobox proteins play an important role in the formation and development of tissues and organs in the embryonic period. In our study, the distribution of Dlx-5 and TLX proteins, which are members of the homeobox family, in the testis, epididymis and ductus deferens ducts of some cat breeds were investigated. For this purpose, in the study, 18 testes younger than six months (immature) and older than one year (mature) were examined under a light microscope using an immunohistochemical method (indirect streptavidin-biotin complex). While it was determined that Dlx-5 and TLX1 proteins were expressed at varying levels in cells in immature and mature cat testicles, epithelial cells of ductus epididymis and ductus deferens, and smooth muscle cells of ductus deferens, no differences were observed between cat breeds. Dlx-5 immunoreactivity was more intense in the testes, epididymis and deferens ducts of immature and mature compared to TLX1. These results suggested that both proteins play important roles in the development of male feline genital organs and in the secretion and differentiation of cells, and also further observation of Dlx-5 expression suggested that this protein may be more effective than TLX1 in testicular development and physiological processes.
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    Expression pattern and cellular localization of two critical non-nuclear progesterone receptors in the ovine corpus luteum during the estrous cycle and early pregnancy
    (Elsevier, 2022) Atli, Mehmet O.; Akbalik, Mehmet Erdem; Kose, Mehmet; Alak, Ilyas; Atli, Zehra; Hitit, Mustafa
    The study aimed to investigate the expression and cellular localization of two critical non-nuclear progesterone receptors, including membrane-associated-progesterone-receptor-component-1 (PGRMC1) and progestin and adipoQ receptor family member 7 (PAQR7) throughout the estrous cycle and early pregnancy in ovine corpus luteum (CL). Ewes were randomly grouped into cyclic (C, n = 4 per group) or pregnant (P, n = 4 per group) groups. Following slaughtering, the CL was obtained from both cyclic and pregnant ewes on days 12 (C12 and P12), 16 (C16 and P16), and 22 (C22 and P22). Western blotting and RT-qPCR were utilized to assess the expression levels of PGRMC1 and PAQR7, whereas immunohistochemistry was performed to determine the localization of PGRMC1 and PAQR7 in CL. Data were evaluated by one-way ANOVA, and the P < 0.05 was considered a significant difference. PGRMC1 was shown to be expressed in both small and large luteal cells and endothelial cells in CL, while PAQR7 expression was only found in small and large luteal cells. Compared to cycle days, pregnancy increased the expression of PGRMC1. PAQR7 did not differ during early pregnancy but reduced during the functional luteolysis stage (C16). mRNA and protein expression patterns for PGRMC1 and PAQR7 were similar on the studied days. This is the first study that demonstrates the expression and cellular localization of PGRMC1 and PAQR7 in ovine CL. We suggest that these receptors could execute a significant role in the ovine CL life span in both cyclic changes and the establishment of pregnancy.
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    IMMUNOHISTOCHEMICAL LOCALISATION OF OESTROGEN AND EPIDERMAL GROWTH FACTOR RECEPTORS OF THE BITCH UTERUS IN THE SEXUAL CYCLE
    (Natl Veterinary Research Inst, 2010) Ozyurtlu, Nihat; Sagsoz, Hakan; Saruhan, Berna Guney; Zonturlu, Abuzer Kaffar; Ketani, Muzaffer Aydin; Akbalik, Mehmet Erdem
    The localisation of oestrogen (ER) and epidermal growth Factor receptors (EGFR) in the various cell types of the bitch uterine was determined. In this study, 23 adult, healthy crossbred bitches brought to the clinic for ovariohisterectomy were used. ER and EGFR positive staining was detected in all cell types of the uterus. A distinct staining was seen in the luminal and glandular epithelium; while stromal and myometrial cells showed weak or moderate staining. The endothelial and smooth muscle cells of the vessels in the endometrium and myometrium sometimes appeared positive. No staining was observed in the mesothelium. The results of this study suggested that ER and EGFR were expressed at various levels in different cell types of bitch uterus. In light of the previous studies, and data of the presented investigations, it may be necesssary to elicit the harmonious proliferation and differentiation of epithelial and stromal cells that are considered essential for the preparation of the uterus for implantation.
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    IMMUNOLOCALIZATION OF HOXA11 AND HLX PROTEINS IN COW PLACENTA DURING PREGNANCY
    (Univ Ljubljana, Veterinary Faculty, 2022) Topaloglu, Ugur; Ketani, Muzaffer Aydin; Akbalik, Mehmet Erdem; Sagsoz, Hakan; Saruhan, Berna Guney; Bayram, Bayram
    In addition to its many functions, the placenta is characterized by the intensity and characteristics of its hormonal functions. It has been reported that the development and vascularization of the placenta with normal fetal growth is regulated by many factors such as growth factors, transcriptional factors, and homeobox proteins. This study was conducted to deter-mine the distribution and possible physiological roles of HOXA11 and HLX in the uterus and placenta of pregnant cows. In this study, 27 pregnant Holstein breed cow uteri and placentas obtained from private slaughterhouses were used as tissue samples. In order to determine the pregnancy period of the obtained uterus, the ages of the fetuses were calculated according to the age calculation formula. The uteri were classified under three different groups as the first (69-89 days), second (99-178 days), and third (190-269 days) periods of pregnancy so that there are 9 animals in each group. Tissue samples were then sub-jected to immunohistochemistryto demonstrate the presence of HOXA11 and HLX proteins. It was observed that HOXA11 and HLX immunoreactions occurred prominently in the luminal and glandular epithelial cells of the uterus during pregnancy, and the maternal epithelial cells of the placenta and UTC and TGC/BNCs. In addition, it was determined that HOXA11 immunore-action also formed in some vascular endothelial cells. Immunohistochemical findings in this study suggested that Hoxa11 and HLX may affect the proliferation and differentiation of cells in the uterus and placenta during pregnancy in cows, and that these proteins may contribute to normal uterine physiology, placentation formation, and continuity of pregnancy in cows.
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    Localization of Estrogen Receptor Alpha and Progesterone Receptor B in the Bovine Ovary During the Follicular and Luteal Phase of the Sexual Cycle
    (Kafkas Univ, Veteriner Fakultesi Dergisi, 2011) Akbalik, Mehmet Erdem; Sagsoz, Hakan; Saruhan, Berna Guney
    Ovarian steroid hormones, mainly estrogen and progesterone, play a central role in the regulation of ovarian functions. The biological effects of progesterone (PR) and estrogen (ER) are dependent on the activation of both PR and ER isoforms. In the present study, we studied the cellular distribution and localization of progesterone receptor B (PR-B) and estrogen receptor alpha (ER alpha) in the bovine ovaries during the follicular and luteal phases of the sexual cycle using immunohistochemical methods. The estrous cycle stage of 23 Holstein bovines was evaluated by gross and histological appearance of ovaries and blood steroid hormone values. Tissue samples from ovaries were fixed in 10% formaldehyde for routine histological processing. ERa immunoreactivity was observed in nuclei of granulosa cells of growing follicles at all stages from primary to mature follicles, epithelial cells of the germinal epithelium, stroma cells, theca cells, corpora lutea cells and cells of the corpora albicantia. Nuclear staining for PR-B was not detected in the granulosa cells in all sizes of follicles, but was positively stained in germinal epithelium cells, stroma cells, corpora albicantia cells and corpora lutea cells. In conclusion, ER alpha and PR-B immunoreactivity in bovine ovary were not indicate too much difference between the phases of the sexual cycle but have important differences in cell-spesific localization.
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    A Morphological Study on Iridocorneal Angle and Ciliary Body of the Anatolian Shepherd Dogs (Canis familiaris)
    (Kafkas Univ, Veteriner Fakultesi Dergisi, 2015) Akbalik, Mehmet Erdem; Erdogan, Serkan; Sagsoz, Hakan; Saruhan, Berna Guney
    This study was carried out to determine morphological structures of Anatolian Shepherd dog eye to compare with other animals. This important sensory organ from five adult male dogs were investigated by light microscopic and scanning electron microscopic analyses. Anatolian Shepherd dog cornea is about 435 (center) to 501 (periphery) mu m thick. The dense pigmentation observed in the anterior and posterior iridal epithelium. The ciliary cleft of the iridocorneal angle was not large and well-developed. The ciliary processes, another component of the ciliary body, formed the conspicuous bundles. In conclusion, it is considered that the description of the morphological properties of both the iridocorneal region and the ciliary body would contribute to the interpretation of the functional correlation, thus to future experimental studies to be conducted in this field.