title: Pharyngeal Satellite Cells Undergo Myogenesis Under Basal Conditions and Are Required for Pharyngeal Muscle Maintenance.
abstract: The pharyngeal muscles of the nasal, oral, and laryngeal pharynxes are required for swallowing. Pharyngeal muscles are preferentially affected in some muscular dystrophies yet spared in others. Muscle stem cells, called satellite cells, may be critical factors in the development of pharyngeal muscle disorders; however, very little is known about pharyngeal satellite cells (PSC) and their role in pharyngeal muscles. We show that PSC are distinct from the commonly studied hindlimb satellite cells both transcriptionally and biologically. Under basal conditions PSC proliferate, progress through myogenesis, and fuse with pharyngeal myofibers. Furthermore, PSC exhibit biologic differences dependent on anatomic location in the pharynx. Importantly, PSC are required to maintain myofiber size and myonuclear number in pharyngeal myofibers. Together, these results demonstrate that PSC are critical for pharyngeal muscle maintenance and suggest that satellite cell impairment could contribute to pharyngeal muscle pathology associated with various muscular dystrophies and aging.
authors.affiliation: Department of Pharmacology, Emory University, Atlanta, Georgia, USA.
authors.forename: Matthew E
authors.initials: ME
authors.lastname: Randolph
authors.affiliation: Department of Pharmacology, Emory University, Atlanta, Georgia, USA.
authors.forename: Brittany L
authors.initials: BL
authors.lastname: Phillips
authors.affiliation: Department of Pharmacology, Emory University, Atlanta, Georgia, USA.
authors.forename: Hyo-Jung
authors.initials: HJ
authors.lastname: Choo
authors.affiliation: Department of Pharmacology, Emory University, Atlanta, Georgia, USA.
authors.forename: Katherine E
authors.initials: KE
authors.lastname: Vest
authors.affiliation: Department of Pharmacology, Emory University, Atlanta, Georgia, USA.
authors.forename: Yandery
authors.initials: Y
authors.lastname: Vera
authors.affiliation: Department of Pharmacology, Emory University, Atlanta, Georgia, USA.
authors.forename: Grace K
authors.initials: GK
authors.lastname: Pavlath
mesh_terms: D000818:Animals; D051379:Mice; D008817:Mice, Mutant Strains; D024510:Muscle Development; D010609:Pharyngeal Muscles / Q000166:cytology / Q000378:metabolism*; D032496:Satellite Cells, Skeletal Muscle / Q000166:cytology / Q000378:metabolism*
keywords: Muscle maintenance; Myofiber; Myonuclear turnover; Pharynx; Satellite cells