# Impact of Dexamethasone on Three-Dimensional Stem Cell Spheroids: Morphology, Viability, Osteogenic Differentiation

## TL;DR

This study examines how dexamethasone affects stem cell spheroids in terms of structure, survival, and bone development.

## Contribution

The study evaluates dexamethasone's impact on 3D stem cell spheroids, focusing on viability and osteogenic differentiation.

## Key findings

- Spheroids self-assembled and maintained structure over seven days.
- RUNX2 gene expression increased at 1 μM, 10 μM, and 100 μM dexamethasone.
- COL1A1 expression significantly increased at 0.1 μM and 1 μM dexamethasone.

## Abstract

Background and Objectives: Dexamethasone has been widely researched for its ability to promote osteogenic differentiation in mesenchymal stem cells in basic research. This study focused on examining the effects of dexamethasone on both cell viability and osteogenic differentiation in three-dimensional stem cell spheroids. Materials and Methods: These spheroids were created using concave microwells and exposed to dexamethasone at concentrations ranging from 0 μM to 100 μM, including intermediate levels of 0.1 μM, 1 μM, and 10 μM. Microscopic analysis was used to qualitatively assess cellular viability, while a water-soluble tetrazolium salt-based assay provided quantitative viability data. Osteogenic differentiation was evaluated by measuring alkaline phosphatase activity and calcium deposition using Alizarin Red staining. Additionally, the expression levels of genes associated with osteogenesis were measured through quantitative polymerase chain reaction. Results: The spheroids successfully self-assembled within the first 24 h and maintained their structural integrity over a seven-day period. Analysis of cell viability showed no statistically significant differences across the various dexamethasone concentrations tested. Although there was an observed increase in alkaline phosphatase activity and calcium deposition following dexamethasone treatment, these differences were not statistically significant. RUNX2 gene expression was upregulated in the 1 μM, 10 μM, and 100 μM groups, while COL1A1 expression significantly increased at 0.1 μM and 1 μM. Conclusions: These results indicate that dexamethasone supports cell viability and enhances RUNX2 and COL1A1 expression in stem cell spheroids.