Aging affects the number and morphological heterogeneity of rat phrenic motor neurons and phrenic motor axons.
aging
motor neurons
neurodegeneration
respiratory system
Journal
Physiological reports
ISSN: 2051-817X
Titre abrégé: Physiol Rep
Pays: United States
ID NLM: 101607800
Informations de publication
Date de publication:
01 2023
01 2023
Historique:
revised:
06
01
2023
received:
02
12
2022
accepted:
08
01
2023
entrez:
25
1
2023
pubmed:
26
1
2023
medline:
28
1
2023
Statut:
ppublish
Résumé
Diaphragm muscle (DIAm) motor units comprise a phrenic motor neuron (PhMN), the phrenic nerve and the muscle fibers innervated, with the size of PhMNs and axons characteristic of motor unit type. Smaller PhMNs and their axons comprise slow (type S) and fatigue-resistant (type FR) DIAm motor units, while larger PhMNs and their axons comprise more fatigable (type FF) motor units. With aging, we have shown a loss of larger PhMNs, consistent with selective atrophy of type IIx/IIb DIAm fibers and reduced maximum DIAm force. In the present study, we hypothesized that with aging there is a loss of larger myelinated phrenic α motor axons. Female and male young (6 months) and old (24 months) Fischer 344 rats were studied. PhMNs were retrogradely labeled by intrapleural injection of 488-conjugated CTB. The phrenic nerves were excised ~1 cm from the DIAm insertion and mounted in resin, and phrenic α motor axons were delineated based on size (i.e., >4 μm diameters). In older rats, the number of larger PhMNs and larger phrenic α motor axons were reduced. There were no differences in non-α axons. In addition, there was evidence of demyelination of larger phrenic α motor axons in older rats. Together, these findings are consistent with the selective age-related vulnerability of larger PhMNs and denervation of type FF motor units, which may underlie DIAm sarcopenia.
Identifiants
pubmed: 36695744
doi: 10.14814/phy2.15587
pmc: PMC9875821
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Langues
eng
Sous-ensembles de citation
IM
Pagination
e15587Subventions
Organisme : NIA NIH HHS
ID : R01 AG044615
Pays : United States
Organisme : NHLBI NIH HHS
ID : R01 HL146114
Pays : United States
Informations de copyright
© 2023 The Authors. Physiological Reports published by Wiley Periodicals LLC on behalf of The Physiological Society and the American Physiological Society.
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