Change from a hard to soft diet alters the expression of insulin-like growth factors, their receptors, and binding proteins in association with atrophy in adult mouse masseter muscle
| Autor: | Toki Urushiyama, Akira Yamane, Jun-Ichi Miyazaki, Tadayoshi Fukui, Satonari Akutsu, Thomas G.H. Diekwisch |
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| Rok vydání: | 2004 |
| Předmět: |
Male
medicine.medical_specialty Histology IGFBP3 Biology Pathology and Forensic Medicine Masseter muscle Mice Atrophy Somatomedins Internal medicine medicine Animals Weaning IGFBP1 RNA Messenger Receptor Masseter Muscle Immunochemistry Soft diet Receptors Somatomedin Cell Biology medicine.disease Diet Insulin-Like Growth Factor Binding Proteins Endocrinology Gene Expression Regulation Carrier Proteins Immunostaining |
| Zdroj: | Cell and Tissue Research. 315:97-105 |
| ISSN: | 1432-0878 0302-766X |
| DOI: | 10.1007/s00441-003-0787-0 |
| Popis: | To study the role of insulin-like growth factors (IGFs) in the atrophy of mouse masseter muscle in response to a change from a hard to a soft diet, we analyzed the amounts of mRNA and the immunolocalization for IGF-I, IGF-II, their receptors (IGFRs), and binding proteins (IGFBPs). Sixteen male ICR mice were fed a hard diet after weaning; they were divided into two groups at 6 months of age and fed a hard or a soft diet for 1 week. The soft diet treatment decreased masseter weight by 19% ( P0.01) and the minimal diameter of masseter myofibers by 19% ( P0.01), verifying that a soft diet led to atrophy of mouse masseter muscle. The soft diet treatment induced a 30% reduction in the amount of IGF-I mRNA ( P0.05) in preparations of whole masseter tissues. Immunohistochemical findings suggested that a reduction in the expression of IGF-I protein took place in the neural tissues, not in the masseter myofibers. The soft diet treatment induced a 56% decrease in IGF-II mRNA ( P0.05), a 21% increase in IGFR2 mRNA ( P0.01), and a 38% decrease in IGFBP5 mRNA ( P0.01). Immunohistochemical results suggested that these changes at the protein level occurred in the masseter myofibers. No significant or marked difference in the mRNA amount or immunostaining pattern for IGFR1, IGFBP3, IGFBP4, or IGFBP6 was found between the soft and hard diet groups. No IGFBP1 or IGFBP2 mRNA was detected. Thus, IGF-I, IGF-II, IGFR2, and IGFBP5 seem to play a role in the atrophy of mouse masseter muscle in response to the change from a hard to a soft diet in an autocrine and/or paracrine manner. |
| Databáze: | OpenAIRE |
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