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MİNBAY, FATMA ZEHRA

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MİNBAY

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FATMA ZEHRA

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2019 - 201912020 - 20221
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    Glutamatergic activation of A1 and A2 noradrenergic neurons in the rat brain stem
    (Medicinska Naklada, 2019-07-10) Gök-Yurtseven, Duygu; Kafa, İlker M.; Minbay, Zehra; Eyigör, Özhan; GÖK YURTSEVEN, DUYGU; KAFA, İLKER MUSTAFA; MİNBAY, FATMA ZEHRA; EYİGÖR, ÖZHAN; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Histoloji Bölümü ve Embriyoloji Bilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Anatomi Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Histoloji ve Embriyoloji Anabilim Dalı.; 0000-0001-8309-0934; 0000-0003-3463-7483; AAW-4867-2021; AAG-7125-2021; ABE-5128-2020; ABC-1475-2020
    Aim To analyze the effects of glutamatergic agonists and antagonists on the activation of the A1 and A2 noradrenergic neurons localized in caudal ventrolateral medulla and nucleus tractus solitarii, respectively.Methods Rats were injected with glutamatergic agonists - kainic acid, alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA), or N-methyl-D-aspartic acid (NMDA), and the brain sections were prepared for immunohistochemistry. Before agonist injections, antagonists - 6-cyano-7-nitroquinoxaline-2,3-dione or dizocilpine were administered. The expression of c-Fos, as the neuronal activation marker, and tyrosine hydroxylase (TH), as the marker of noradrenergic neurons was assessed with dual immunohistochemistry. The percentage of c-Fos-positive noradrenergic neurons relative to all TH-positive neurons in the respective areas of the brain stem was calculated.Results All three glutamatergic agonists significantly increased the number of the c-Fos-positive noradrenergic neurons in both the A1 and A2 area when compared with control animals. Kainic acid injection activated about 57% of TH-positive neurons in A1 and 40% in A2, AMPA activated 26% in A1 and 38% in A2, and NMDA 77% in A1 and 22% in A2. The injections of appropriate glutamatergic antagonists greatly decreased the number of activated noradrenergic neurons.Conclusion Our results suggest that noradrenergic neurons are regulated and/or activated by glutamatergic system and that these neurons express functional glutamate receptors.
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    Expression of the ionotropic glutamate receptors on neuronostatin neurons in the periventricular nucleus of the hypothalamus
    (Via Medica, 2022-01-01) Kocoğlu, S. Serter; Çakir, Cihan; ÇAKIR, CİHAN; Eyigör, Özhan; MİNBAY, FATMA ZEHRA; EYİGÖR, ÖZHAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Histoloji ve Embriyoloji Anabilim Dalı.; 0000-0002-8332-7353; 0000-0003-3463-7483; ABC-1475-2020; ABE-5128-2020; AAH-5249-2021; ABQ-8779-2022
    Background: Neuronostatin, a newly identified peptide, is accepted as an anorex- igenic peptide since it suppresses food intake when given intracerebroventricularly. Although the effect mechanisms of neuronostatin have been shown in different studies, there are no reports in the literature describing the mechanisms controlling neuronostatin neurons. In this study, we aimed to determine the presence of the ionotropic glutamate receptor subunits (iGluRs) in neuronostatin neurons in the periventricular nucleus of the hypothalamus. Materials and methods: The presence of glutamate receptors in neuronostatin neurons was investigated by dual immunohistochemistry. Immunohistochemistry was performed on 40 mu m thick coronal brain sections with antibodies against AMPA (GluA1-4), kainate (GluK1/2/3, and GluK5), and NMDA (GluN1 and GluN2A) receptor subunits. Results: The results showed that the neuronostatin neurons expressed most of the NMDA and non-NMDA receptor subunits. The neuronostatin neurons in the anterior hypothalamic periventricular nucleus were particularly immunopositive for GluA1, GluA4, GluK1/2/3, GluK5 and GluN1 antibodies. No expression was observed for GluA2, GluA3 and GluN2A antibodies. Conclusions: For the first time in the literature, our study demonstrated that the neuronostatin neurons express glutamate receptor subunits which may form homomeric or heteromeric functional receptor complexes. Taken together, these results suggest that multiple subunits of iGluRs are responsible for glutamate transmission on neuronostatin neurons in the anterior hypothalamic periventricular nucleus.