BG60S dissolution interferes with osteoblast calcium signals.

Area of Science:

• Biomaterials Science
• Cell Biology
• Calcium Signaling

Background:

• Extracellular calcium concentration is critical for osteoblast function.
• Bioactive glasses are known to release ions that influence cellular responses.
• Understanding how specific bioactive glasses affect osteoblast calcium signaling is important for bone tissue engineering.

Purpose of the Study:

• To investigate the impact of a silicon-rich bioactive glass (BG60S) on intracellular calcium (Ca(i)2+) signals in osteoblasts.
• To examine the effect of BG60S on the expression and localization of inositol 1,4,5-triphosphate receptors (InsP3R) in osteoblasts.

Main Methods:

• Primary osteoblast cultures were treated with BG60S.
• Intracellular calcium (Ca(i)2+) signals were measured using calcium imaging.
• Cells were stimulated with vasopressin and KCl to assess calcium responses.
• Expression and localization of InsP3R subtypes (Type I and Type II) were analyzed.

Main Results:

• BG60S dissolution significantly increased basal Ca(i)2+ signals in osteoblasts.
• Pre-incubation with BG60S enhanced Ca(i)2+ responses to vasopressin stimulation.
• BG60S pre-treatment reduced Ca(i)2+ signals upon KCl stimulation.
• BG60S altered InsP3R expression: Type I InsP3R increased in the nucleus, and Type II InsP3R decreased in the cytosol.

Conclusions:

• BG60S influences intracellular calcium homeostasis in osteoblasts.
• The bioactive glass modulates calcium signaling pathways, including InsP3R-mediated signaling.
• BG60S shows potential for modulating osteoblast activity through calcium signaling manipulation.