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Radiother Oncol. 2013 Sep;108(3):458-63. doi: 10.1016/j.radonc.2013.05.020. Epub 2013 Jun 13.

Salisphere derived c-Kit+ cell transplantation restores tissue homeostasis in irradiated salivary gland.

Author information

1
Department of Cell Biology, University Medical Center Groningen, The Netherlands; Department of Radiation Oncology, University Medical Center Groningen, University of Groningen, The Netherlands.

Abstract

INTRODUCTION:

During radiotherapy salivary glands of head and neck cancer patients are unavoidably co-irradiated, potentially resulting in life-long impairment. Recently we showed that transplantation of salisphere-derived c-Kit expressing cells can functionally regenerate irradiated salivary glands. This study aims to select a more potent subpopulation of c-Kit(+) cells, co-expressing stem cell markers and to investigate whether long-term tissue homeostasis is restored after stem cell transplantation.

METHODS AND RESULTS:

Salisphere derived c-Kit(+) cells that co-expressed CD24 and/or CD49f markers, were intra-glandularly injected into 15 Gy irradiated submandibular glands of mice. Particularly, c-Kit(+)/CD24(+)/CD49f(+) cell transplanted mice improved saliva production (54.59 ± 11.1%) versus the irradiated control group (21.5 ± 8.7%). Increase in expression of cells with differentiated duct cell markers like, cytokeratins (CK8, 18, 7 and 14) indicated functional recovery of this compartment. Moreover, ductal stem cell marker expression like c-Kit, CD133, CD24 and CD49f reappeared after transplantation indicating long-term functional maintenance potential of the gland. Furthermore, a normalization of vascularization as indicated by CD31 expression and reduction of fibrosis was observed, indicative of normalization of the microenvironment.

CONCLUSIONS:

Our results show that stem cell transplantation not only rescues hypo-salivation, but also restores tissue homeostasis of the irradiated gland, necessary for long-term maintenance of adult tissue.

KEYWORDS:

Regeneration; Salivary gland; Stem cell; Tissue homeostasis; c-Kit

PMID:
23769181
DOI:
10.1016/j.radonc.2013.05.020
[Indexed for MEDLINE]
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