title: Transplantated mesenchymal stem cells derived from embryonic stem cells promote muscle regeneration and accelerate functional recovery of injured skeletal muscle.
abstract: We previously established that mesenchymal stem cells originating from mouse embryonic stem (ES) cells (E-MSCs) showed markedly higher potential for differentiation into skeletal muscles in vitro than common mesenchymal stem cells (MSCs). Further, the E-MSCs exhibited a low risk for teratoma formation. Here we evaluate the potential of E-MSCs for differentiation into skeletal muscles in vivo and reveal the regeneration and functional recovery of injured muscle by transplantation. E-MSCs were transplanted into the tibialis anterior (TA) muscle 24 h following direct clamping. After transplantation, the myogenic differentiation of E-MSCs, TA muscle regeneration, and re-innervation were morphologically analyzed. In addition, footprints and gaits of each leg under spontaneous walking were measured by CatWalk XT, and motor functions of injured TA muscles were precisely analyzed. Results indicate that >60% of transplanted E-MSCs differentiated into skeletal muscles. The cross-sectional area of the injured TA muscles of E-MSC-transplanted animals increased earlier than that of control animals. E-MSCs also promotes re-innervation of the peripheral nerves of injured muscles. Concerning function of the TA muscles, we reveal that transplantation of E-MSCs promotes the recovery of muscles. This is the first report to demonstrate by analysis of spontaneous walking that transplanted cells can accelerate the functional recovery of injured muscles. Taken together, the results show that E-MSCs have a high potential for differentiation into skeletal muscles in vivo as well as in vitro. The transplantation of E-MSCs facilitated the functional recovery of injured muscles. Therefore, E-MSCs are an efficient cell source in transplantation.
authors.affiliation: Department of Rehabilitation Sciences, Graduate School of Medicine, Nagoya University , Nagoya, Japan .
authors.forename: Nana Takenaka
authors.initials: NT
authors.lastname: Ninagawa
authors.forename: Eri
authors.initials: E
authors.lastname: Isobe
authors.forename: Yuri
authors.initials: Y
authors.lastname: Hirayama
authors.forename: Rumi
authors.initials: R
authors.lastname: Murakami
authors.forename: Kazumi
authors.initials: K
authors.lastname: Komatsu
authors.forename: Masataka
authors.initials: M
authors.lastname: Nagai
authors.forename: Mami
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Yuka
authors.initials: Y
authors.lastname: Kawabata
authors.forename: Shigeko
authors.initials: S
authors.lastname: Torihashi
keywords: CD105; MSC; embryonic stem cells; functional recovery; regeneration of skeletal muscle
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