Adipose tissue sensitivity to radiation exposure.
Treatment of cancer using radiation can be significantly compromised by the development of severe acute and late damage to normal tissue. Treatments that either reduce the risk and severity of damage or that facilitate the healing of radiation injuries are being developed, including autologous adipose tissue grafts to repair tissue defects or involutional disorders that result from tumor resection. Adipose tissue is specialized in energy storage and contains different cell types, including preadipocytes, which could be used for autologous transplantation. It has long been considered a poorly proliferative connective tissue; however, the acute effects of ionizing radiation on adipose tissue have not been investigated. Therefore, the aim of this study was to characterize the alterations induced in adipose tissue by total body irradiation. A severe decrease in proliferating cells, as well as a significant increase in apoptotic cells, was observed in vivo in inguinal fat pads following irradiation. Additionally, irradiation altered the hematopoietic population. Decreases in the proliferation and differentiation capacities of non-hematopoietic progenitors were also observed following irradiation. Together, these data demonstrate that subcutaneous adipose tissue is very sensitive to irradiation, leading to a profound alteration of its developmental potential. This damage could also alter the reconstructive properties of adipose tissue and, therefore, calls into question its use in autologous fat transfer following radiotherapy.
Poglio
Sandrine
S
Institut Louis Bugnard, Toulouse, France.
Galvani
Sylvain
S
Bour
Sandy
S
André
Mireille
M
Prunet-Marcassus
Bénédicte
B
Pénicaud
Luc
L
Casteilla
Louis
L
Cousin
Béatrice
B
D017667:Adipocytes / Q000166:cytology / Q000378:metabolism / Q000528:radiation effects*; D000273:Adipose Tissue / Q000166:cytology / Q000528:radiation effects*; D000818:Animals; D002454:Cell Differentiation / Q000528:radiation effects*; D049109:Cell Proliferation / Q000528:radiation effects*; D005434:Flow Cytometry; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D051379:Mice; D018384:Oxidative Stress / Q000528:radiation effects; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011833:Radiation Injuries, Experimental / Q000378:metabolism / Q000473:pathology*; D013234:Stem Cells / Q000378:metabolism / Q000473:pathology / Q000528:radiation effects