Ismail Dilogo - ۱ Department of Orthopedic and Traumatology, Faculty of Medicine, Universitas Indonesia-Dr Cipto Mangunkusumo National General Hospital, Jakarta, Indonesia ۲ Stem Cell and Tissue Engineering Research Cluster, Indonesia Medical Education and
Jessica Fiolin - Department of Orthopedic and Traumatology, Faculty of Medicine, Universitas Indonesia-Dr Cipto Mangunkusumo National General Hospital, Jakarta, Indonesia
Anissa Canintika - Department of Orthopedic and Traumatology, Faculty of Medicine, Universitas Indonesia-Dr Cipto Mangunkusumo National General Hospital, Jakarta, Indonesia
Jeanne Pawitan - ۲ Stem Cell and Tissue Engineering Research Cluster, Indonesia Medical Education and Research Institute, Faculty of Medicine Universitas Indonesia ۳ Stem Cell Medical Technology Integrated Service Unit, Dr Cipto Mangunkusumo National General
Evah Luviah - Stem Cell and Tissue Engineering Research Cluster, Indonesia Medical Education and Research Institute, Faculty of Medicine Universitas Indonesia

Background: Recent studies have shown that human bone marrow-derived mesenchymal stem cells (hBM-MSCs) have several drawbacks in treating critical-sized bone defect (CSD). Secretome may offer considerable advantages over living cells in terms of potency, manufacturing and storing easiness, and potential as a ready-to-go osteoinductive agent. However, thus far, there are no studies regarding the efficacy of secretome in bone healing. The objective of this study is to investigate the effect of the secretome in rat models with CSD. Methods: This was an experimental study with post-test only control group design using ۶۰ skeletally mature Sprague Dawley rat which was divided evenly into ۵ treatment groups (MSC only, Secretome only, MSC + Secretome, MSC + Secretome + BMP-۲, Control group using Normal Saline). We used Bone Marrow derived MSC in this research. The critical-sized bone defect was created by performing osteotomy and defect was treated according to the groups. Rats were sacrificed on ۲nd and ۴th week and we measured the radiological outcome using Radiographic Union Score for Tibia (RUST) and histomorphometric (callus, osseous, cartilage, fibrous, and void area) evaluation using Image J. Results: There was no difference in the weight of rats between groups before and after the intervention. RUST score in all intervention group is significantly higher than the control group, however, the MSC-only group was not statistically significant higher than the control group. There is no statistically significant difference in RUST Score between intervention groups. Histomorphometric evaluation showed that total callus formation is the widest in the MSC+Secretome+BMP-۲ combination group while the osseous area is found highest on the secretome-only group. Conclusion: Secretome, whether used solely or combined with BM-MSC and BMP-۲, is a novel, potent bone-healing agent for CSD in rat models. Level of evidence: V

Secretome, Mesenchymal stem cell, radiographic, Histomorphometric, Bone Healing, Sprague Dawley Rat