PMID- 31256666 OWN - NLM STAT- MEDLINE DCOM- 20190708 LR - 20190709 IS - 2049-4408 (Electronic) IS - 2049-4394 (Linking) VI - 101-B IP - 7 DP - 2019 Jul TI - Multiple intra-articular injections of allogeneic bone marrow-derived stem cells potentially improve knee lesions resulting from surgically induced osteoarthritis: an animal study. PG - 824-831 LID - 10.1302/0301-620X.101B7.BJJ-2018-1532.R1 [doi] AB - AIM: Mesenchymal stem cells (MSCs) have several properties that may support their use as an early treatment option for osteoarthritis (OA). This study investigated the role of multiple injections of allogeneic bone marrow-derived stem cells (BMSCs) to alleviate the progression of osteoarthritic changes in the various structures of the mature rabbit knee in an anterior cruciate ligament (ACL)-deficient OA model. MATERIALS AND METHODS: Two months after bilateral section of the ACL of Japanese white rabbits aged nine months or more, either phosphate buffered saline (PBS) or 1 x 10(6) MSCs were injected into the knee joint in single or three consecutive doses. After two months, the articular cartilage and meniscus were assessed macroscopically, histologically, and immunohistochemically using collagen I and II. RESULTS: Within the PBS injection (control group), typical progressive degenerative changes were revealed in the various knee structures. In the single MSC injection (single group), osteoarthritic changes were attenuated, but still appeared, especially in the medial compartments involving fibrillation of the articular cartilage, osteophyte formation in the medial plateau, and longitudinal tear of the meniscus. In the multiple-injections group, the smoothness and texture of the articular cartilage and meniscus were improved. Histologically, absence or reduction in matrix staining and cellularity were noticeable in the control and single-injection groups, respectively, in contrast to the multiple-injections group, which showed good intensity of matrix staining and chondrocyte distribution in the various cartilage zones. Osteoarthritis Research Society International (OARSI) scoring showed significantly better results in the multiple-injections group than in the other groups. Immunohistochemically, collagen I existed superficially in the medial femoral condyle in the single group, while collagen II was more evident in the multiple-injections group than the single-injection group. CONCLUSION: A single injection of MSCs was not enough to restore the condition of osteoarthritic joints. This is in contrast to multiple injections of MSCs, which had the ability to replace lost cells, as well as reducing inflammation. Cite this article: Bone Joint J 2019;101-B:824-831. FAU - Mahmoud, E E AU - Mahmoud EE AD - Department of Surgery, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt. FAU - Adachi, N AU - Adachi N AD - Department of Orthopaedic Surgery, Integrated Health Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan. FAU - Mawas, A S AU - Mawas AS AD - Department of Pathology and Clinical Pathology, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt. FAU - Deie, M AU - Deie M AD - Department of Orthopaedic Surgery, Aichi Medical University, Aichi, Japan. FAU - Ochi, M AU - Ochi M AD - Hiroshima University, Hiroshima, Japan. LA - eng PT - Journal Article PL - England TA - Bone Joint J JT - The bone & joint journal JID - 101599229 SB - IM MH - Animals MH - Anterior Cruciate Ligament/surgery MH - Injections, Intra-Articular MH - Mesenchymal Stem Cell Transplantation/*methods MH - Osteoarthritis, Knee/etiology/pathology/*therapy MH - Rabbits MH - Transplantation, Homologous MH - Treatment Outcome OTO - NOTNLM OT - Allogeneic BMSCs OT - Knee lesions OT - OA treatment OT - Rabbit model EDAT- 2019/07/02 06:00 MHDA- 2019/07/10 06:00 CRDT- 2019/07/02 06:00 PHST- 2019/07/02 06:00 [entrez] PHST- 2019/07/02 06:00 [pubmed] PHST- 2019/07/10 06:00 [medline] AID - 10.1302/0301-620X.101B7.BJJ-2018-1532.R1 [doi] PST - ppublish SO - Bone Joint J. 2019 Jul;101-B(7):824-831. doi: 10.1302/0301-620X.101B7.BJJ-2018-1532.R1.