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Title: Melatonin-synthesizing enzymes and melatonin receptor in rat thyroid cells
Issue Date: 2012
Publisher: F. Hernández y Juan F. Madrid. Universidad de Murcia. Departamento de Biología Celular e Histología
Citation: Histology and histopathology, Vol. 27, n.º 11 (2012)
ISSN: 1699-5848
Related subjects: CDU::5 - Ciencias puras y naturales::57 - Biología::576 - Biología celular y subcelular. Citología
Keywords: Melatonin
Abstract: Melatonin is an indoleamine with a wide spectrum of biological activities other than transmitting photoperiod information, including antioxidant, oncostatic, anti-aging and immunomodulatory properties. Although melatonin is synthesized mainly in the pineal gland, other tissues have the same capacity. In the present study, we examined whether two key enzymes in melatonin biosynthesis, arylalkylamine Nacetyltransferase (AANAT) and hydroxyindole-O-methyltransferase (HIOMT) and its receptor MT1 are expressed in the two endocrine thyroid cells of the rat, follicular cells and C cells. Reverse transcriptase polymerase chain reaction analyses demonstrated that both AANAT and HIOMT mRNAs are expressed in the rat thyroid C-cells, and MT1 expression has been detected in C cells and follicular cells. Immunofluorescence revealed that AANAT protein is localized in C-cell cytoplasm, and MT1 protein in both cell populations. These findings demonstrate that the rat thyroid expresses AANAT, HIOMT, and its receptor MT1, showing that C cells are the main melatonin-synthesizing sites in the thyroid. This local C-cell-secreted melatonin may protect follicular cells from the oxidative stress inherent to the thyroid gland, and could also have paracrine and autocrine functions.
Primary author: García-Marín, Rocío
Miguel, de Miguel
Fernández-Santos, José Mª
Carrillo-Vico, Antonio
Utrilla, José Carmelo
Morillo-Bernal, Jesús
Díaz-Parrado, Eduardo
Rodríguez-Prieto, Ismael
Guerrero, Juan Miguel
Martín-Lacave, Inés
Document type: info:eu-repo/semantics/article
Number of pages / Extensions: 10
Rights: info:eu-repo/semantics/openAccess
Appears in Collections:Vol.27, nº11 (2012)

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