| Autor: |
Bodvael Fraysse, Jean-François Desaphy, Jean-François Rolland, Sabata Pierno, Antonella Liantonio, Viviana Giannuzzi, Claudia Camerino, M. Paola Didonna, Daniela Cocchi, Annamaria De Luca, Diana Conte Camerino |
| Jazyk: |
angličtina |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
Neurobiology of Disease, Vol 21, Iss 2, Pp 372-380 (2006) |
| Druh dokumentu: |
article |
| ISSN: |
1095-953X |
| DOI: |
10.1016/j.nbd.2005.07.012 |
| Popis: |
The mechanisms by which aging induces muscle impairment are not well understood yet. We studied the impact of aging on Ca2+ homeostasis in the slow-twitch soleus and the fast-twitch extensor digitorum longus (EDL) muscles of aged rats by using the fura-2 fluorescent probe. In both muscles aging increases the resting cytosolic calcium concentration ([Ca2+]i). This effect was independent on calcium influx since a reduced resting permeability of sarcolemma to divalent cations was observed in aged muscles likely due to a reduced activity of leak channels. Importantly the effects of aging on resting [Ca2+]i, fiber diameter, mechanical threshold and sarcolemmal resting conductances were less pronounced in the soleus muscle, suggesting that muscle impairment may be less dependent on [Ca2+]i in the slow-twitch muscle. The treatment of aged rats with growth hormone restored the resting [Ca2+]i toward adult values in both muscles. Thus, an increase of resting [Ca2+]i may contribute to muscle weakness associated with aging and may be considered for developing new therapeutic strategies in the elderly. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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