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DOI: 10.14670/HH-11-758
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Título: | Histological assessment for femora of ovariectomized obesity (db/db) mice carrying mutated leptin receptor |
Fecha de publicación: | 2016 |
Editorial: | Universidad de Murcia. Departamento de Biología Celular e Histología |
Cita bibliográfica: | Histology and Histopathology, Vol.31, nº12, (2016) |
ISSN: | 1699-5848 0213-3911 |
Materias relacionadas: | CDU::6 - Ciencias aplicadas::61 - Medicina::616 - Patología. Medicina clínica. Oncología |
Palabras clave: | Db/db mice Overiectomy Leptin Osteoblast Adipocytes |
Resumen: | In order to provide a clue to understand the interplay between leptin and estrogen, we have examined femoral metaphyses of ovariectomized db/db mice carrying a mutated leptin receptor. We performed ovariectomy (OVX) or sham-operation (sham) on 12- week old female wild-type and db/db mice, and then, after 8 weeks, divided the animals into four groups: wild-type sham, wild-type OVX, db/db sham and db/db OVX. Samples from all groups were prepared for histochemical and ultrastructural examinations. As a result, db/db sham mice showed a reduced number and thickness of metaphyseal trabeculae and excessive adipose tissue when compared to wild-type sham mice. The wild-type OVX group exhibited markedly diminished trabecular number, as well as lower populations of osteoblasts and osteoclasts in comparison to wild-type sham group. On the other hand, trabecular numbers were similar for the two db/db groups, suggesting that the effect of the ovariectomy, i.e., estrogen deficiency may be lessened in this animal model. Leptin receptor was mainly found in osteoblasts and in bone marrow stromal cells including adipocytes. In addition, the expression of estrogen receptor did not seem to change after OVX in wild-type mice and in db/db mice. Both db/db sham and OVX mice featured many adipocytes close to the metaphyseal chondroosseous junction, while osteoblasts accumulated glycogen granules and lipid droplets. Therefore, it seems likely that the disruption of leptin signaling in db/db mice shifts the cell differentiation cascade towards the adipocyte lineage, resulting in an osteoporotic bone independently of estrogen deficiency. |
Autor/es principal/es: | Tanaka, Yusuke Hasegawa, Tomoka Yamada, Tamaki Yamamoto, Tomomaya Sasaki, Muneteru Hongo, Hiromi Tsuboi, Kanako Haraguchi, Mai Luiz de Freitas, Paulo Henrique Li, Minqi Oda, Kimimitsu Totsuka, Yasunori Tei, Kanchu Amizuka, Norio |
URI: | http://hdl.handle.net/10201/114747 |
DOI: | DOI: 10.14670/HH-11-758 |
Tipo de documento: | info:eu-repo/semantics/article |
Número páginas / Extensión: | 12 |
Derechos: | info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
Aparece en las colecciones: | Vol.31,nº 12 (2016) |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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Tanaka-31-1315-1326-2016.pdf | 10,26 MB | Adobe PDF | Visualizar/Abrir |
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