Pericyte in the adult muscle satellite cell niche: A key player in steady state and recovery - 03/10/18
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Resumen |
Introduction/objectives |
Muscle growth and regeneration are supported by muscle satellite cells (muSCs) that reside beneath the myofiber basement membrane in close proximity to capillaries. Pericytes play a key role in the microvascular niche of muSCs during post-natal stages of muscle growth, by promoting post-natal myogenesis through IGF-1 and inducing muSC quiescence ending the accretion phase through Angiopoietin-1. Since 90% of capillaries have pericyte coverage at the end of muscle growth, we investigated the role of pericytes in the adult muSC niche.
Materials/Patients and methods |
We used TNAP-CreERT2 mice crossed with R26RDTRstoploxP/stoploxP, Angiopoietin-1loxP/loxP, and R26RmTloxPmG/loxPmG animals to generate respectively conditional models for diphteria toxin-induced muscle depletion of microvascular cells, ablation of microvascular Angiopoietin-1 and fluorescent tracing of microvascular cells.
Results |
Conditional muscle pericyte depletion could not be used due to extensive, presumably ischaemic, muscle necrosis. In contrast, selective Cre recombinase ablation of Angiopoietin-1 gene in TNAP+ pericytes induced release of adult mSCs from quiescence. Following chemical injury, the ablation caused delayed muscle regeneration with persistently cycling Pax7+ mSCs. Selective type 2 fiber hypotrophy was observed consistently with prominent association of TNAP-expressing microvessels with type 2 fibers observed in TNAP-GFP reporter mice.
Conclusions |
We conclude that pericytes associated with endothelial cells exert paracrine effects on adjacent myogenic cells that participate in maintaining adult muscle homeostasis and during muscle repair.
El texto completo de este artículo está disponible en PDF.Keywords : Pericytes, Satellite cells niche, Angiopoietin, Homeostasis, Regeneration
Esquema
Vol 102 - N° 338
P. 153-154 - septembre 2018 Regresar al númeroBienvenido a EM-consulte, la referencia de los profesionales de la salud.
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