Pre-mRNA processing is partially impaired in satellite cell nuclei from aged muscles.
Satellite cells are responsible for the capacity of mature mammalian skeletal muscles to repair and maintain mass. During aging, skeletal muscle mass as well as the muscle strength and endurance progressively decrease, leading to a condition termed sarcopenia. The causes of sarcopenia are manifold and remain to be completely elucidated. One of them could be the remarkable decline in the efficiency of muscle regeneration; this has been associated with decreasing amounts of satellite cells, but also to alterations in their activation, proliferation, and/or differentiation. In this study, we investigated the satellite cell nuclei of biceps and quadriceps muscles from adult and old rats; morphometry and immunocytochemistry at light and electron microscopy have been combined to assess the organization of the nuclear RNP structural constituents involved in different steps of mRNA formation. We demonstrated that in satellite cells the RNA pathways undergo alterations during aging, possibly hampering their responsiveness to muscle damage.
Malatesta
Manuela
M
Dipartimento di Scienze Morfologico-Biomediche, Sezione di Anatomia e Istologia, University of Verona, 37134 Verona, Italy. manuela.malatesta@univr.it
Perdoni
Federica
F
Muller
Sylviane
S
Pellicciari
Carlo
C
Zancanaro
Carlo
C
D000367:Age Factors; D000818:Animals; D002467:Cell Nucleus / Q000737:chemistry / Q000378:metabolism*; D002843:Chromatin / Q000737:chemistry / Q000378:metabolism; D039241:Cleavage Stimulation Factor / Q000737:chemistry / Q000378:metabolism; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D046529:Microscopy, Electron, Transmission; D008856:Microscopy, Fluorescence; D012322:RNA Precursors / Q000737:chemistry / Q000378:metabolism*; D012333:RNA, Messenger / Q000737:chemistry / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D017411:Ribonucleoproteins, Small Nuclear / Q000737:chemistry / Q000378:metabolism*; D032496:Satellite Cells, Skeletal Muscle / Q000166:cytology / Q000378:metabolism*; D018709:Statistics, Nonparametric
D002843:Chromatin; D039241:Cleavage Stimulation Factor; D012322:RNA Precursors; D012333:RNA, Messenger; D017411:Ribonucleoproteins, Small Nuclear