Intervertebral disc repair using adipose tissue-derived stem and regenerative cells: experiments in a canine model.
METHODS
Therapeutic treatment of intervertebral disc repair using cells.


OBJECTIVE
The goal of the study was to test the hypothesis that repair of a damaged disc is possible using autologous adipose tissue derived stem and regenerative cells (ADRCs).


BACKGROUND
Degradation resulting from either acute or chronic repetitive disc injury leads to disc degeneration. However, if a damaged disc could be repaired in the early stages, before the onslaught of degradation, then the disc degeneration process may be slowed down.


METHODS
Twelve dogs underwent a partial nucleotomy at 3 lumbar levels (L3-L4, L4-L5, and L5-L6); adjacent levels served as nonoperated controls. The animals (or discs) were allowed to recover from the surgery for 6 weeks. At that time subcutaneous adipose tissue was harvested and ADRCs were isolated. The 3 experimental discs that had undergone a partial nucleotomy were randomized to receive: (1) ADRCs in hyaluronic acid carrier (Cells/HA); (2) HA only; or (3) No Intervention. Assessments of the 3 experimental discs plus the 2 adjacent untouched discs were made using MRI, radiography, histology, and biochemistry. The animals were killed at 6 months and at 12 months.


RESULTS
Repair in this study was specifically demonstrated through histology and biochemical analysis. Disc levels receiving ADRCs more closely resembled the healthy controls as evidenced in matrix translucency, compartmentalization of the anulus, and in cell density within the nucleus pulposus. Matrix analysis for Type-II collagen and aggrecan demonstrated evidence of a statistically better regenerative stimulation to the disc provided by ADRCs when compared to either the HA only or no intervention treatments.


CONCLUSIONS
Autologous adipose tissue derived stem and regenerative cells, as used in this disc injury model, were effective in promoting disc regeneration, as evidenced by disc matrix production and overall disc morphology.
Ganey
Timothy
T
Department of Orthopaedic Surgery, Atlanta Medical Center, Atlanta, GA 30312, USA. Timothy.ganey@tenethealth.com
Hutton
William C
WC
Moseley
Timothy
T
Hedrick
Mark
M
Meisel
Hans-Joerg
HJ
D000273:Adipose Tissue / Q000166:cytology*; D053674:Aggrecans / Q000378:metabolism; D000818:Animals; D001861:Bone Regeneration; D024043:Collagen Type II / Q000378:metabolism; D004285:Dogs; D007403:Intervertebral Disc / Q000378:metabolism / Q000473:pathology / Q000601:surgery*; D055959:Intervertebral Disc Degeneration / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D033581:Stem Cell Transplantation; D013234:Stem Cells / Q000166:cytology*; D014182:Transplantation, Autologous
D053674:Aggrecans; D024043:Collagen Type II