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Background/Aims: Cartilage oligomeric matrix protein (COMP)-angiopoietin 1 (Ang1) is a soluble and stable form of Ang1 which plays important roles in vessel formation and the survival of endothelial cells, neurons and cardiomyocytes. However, the effects of COMP-Ang1 on the survival of mesenchymal cells are unknown. Mesenchymal cells have been transplanted with some scaffolds for bone tissue regeneration, but they occasionally underwent cell death due to a lack of nutrient supply. This study examined the effects of COMP-Ang1 on the survival of mesenchymal cells under nutrient-deprived conditions. Methods: Primary and C3H10T1/2 mesenchymal cells were cultured under serum deprivation with or without COMP-Ang1. The effects of COMP-Ang1 on mesenchymal cell survival and its molecular mechanism were determined using a viability test, RT-PCR, Western blotting and fluorescence-activated cell sorting analysis. Results and Conclusion: COMP-Ang1 inhibited the nutrient-deprived apoptotic cell death of mesenchymal cells through the Akt, p38 and extracellular-signal-regulated kinase (ERK) pathways. In addition, COMP-Ang1 reversed the nutrient-deprived suppression of cyclin D1 mRNA expression. These results suggest that COMP-Ang1 has a protective role in the survival of nutrient-deprived mesenchymal cells. The use of COMP-Ang1 with some scaffolds might be useful for bone tissue engineering.

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