Acute mobilization and migration of bone marrow-derived stem cells following anterior cruciate ligament rupture. Issue 8 (August 2017)

• Record Type: Journal Article
• Authors: Maerz, T.; Fleischer, M.; Newton, M.D.; Davidson, A.; Salisbury, M.; Altman, P.; Kurdziel, M.D.; Anderson, K.; Bedi, A.; Baker, K.C.
• Is Part Of: Osteoarthritis and cartilage. Volume 25:Issue 8(2017)
• Page Start: 1335
• Page End: 1344
• Publication Date: 2017-08
• Subjects: Anterior cruciate ligament rupture -- Post-traumatic osteoarthritis -- Mesenchymal stem cells -- Mobilization -- Migration -- Cellular recruitment; Osteoarthritis -- Periodicals; Cartilage -- Periodicals; Osteoarthritis -- Periodicals; Cartilage -- Periodicals; Arthrose -- Périodiques; Articulations -- Maladies -- Périodiques; 616.7223005
• DOI: 10.1016/j.joca.2017.03.004
• Languages: English
• ISSNs: 1063-4584

Abstract

Summary: Objective: Little is known regarding acute local and systemic processes following anterior cruciate ligament (ACL) rupture. No study has elucidated whether bone marrow-derived mesenchymal stem cells (MSCs) are mobilized into circulation and recruited to the injured joint. Methods: In Part 1, Lewis rats were randomized to noninvasive ACL rupture (Rupture) or non-injured (Control) (n = 6/group). After 72 h, whole blood MSC concentration was assessed using flow cytometry. Synovial fluid and serum were assayed for stromal cell-derived factor (SDF)-1α and cartilage degeneration biomarkers, respectively. In Part 2, 12 additional rats were randomized and intravenously-injected with fluorescently-labeled allogenic MSCs. Cell tracking was performed using longitudinal, in vivo and ex vivo near-infrared (NIR) imaging and histology. Synovium SDF-1α and interleukin (IL)-17A immunostaining was performed. Serum was assayed for SDF-1α and 29 other cytokines. Results: In Part 1, there was a significant increase in MSC concentration and synovial fluid SDF-1α in Rupture. No differences in cartilage biomarkers were observed. In Part 2, Rupture had significantly higher NIR signal at 24, 48, and 72 h, indicating active recruitment of MSCs to the injured joint. Ex vivo cell tracking demonstrated MSC localization in the synovium and myotendinous junction (MTJ) of the quadriceps. Injured synovia exhibited increased synovitis grade and higher degree of IL-17A and SDF-1α immunostaining. Conclusion: ACL rupture induced peripheral blood mobilization of MSCs and migration of intravenously-injected allogenic MSCs to the injured joint, where they localized in the synovium and quadriceps MTJ.