Hypoxia-Responsive Oxygen Nanobubbles for Tissues-Targeted Delivery in Developing Tooth Germs

Area of Science:

• Biomedical Engineering
• Developmental Biology
• Nanotechnology

Background:

• Hypoxia, or low oxygen, impairs normal organ development.
• Oxygen nanobubbles (ONBs) are emerging as a method for oxygen delivery to tissues.
• Mechanisms of ONB action in hypoxic developing tissues are not fully understood.

Purpose of the Study:

• To investigate the efficacy of ONBs in restoring hypoxic developing tooth germs.
• To elucidate the cellular and molecular mechanisms underlying ONB-mediated recovery.
• To assess ONB impact on tooth development stages and hard tissue formation.

Main Methods:

• Tooth germs at cap and bell stages were cultured under normoxic, hypoxic, and ONB-treated conditions.
• Apoptosis, cell proliferation, and glucose uptake were analyzed.
• In vivo studies using kidney transplantation assessed hard tissue formation (amelogenesis and dentinogenesis).

Main Results:

• ONBs successfully rescued hypoxic tooth germs at both cap and bell stages, reducing apoptosis.
• ONBs restored normal amelogenesis and dentinogenesis in vivo, counteracting hypoxic defects.
• ONBs normalized upregulated glucose uptake in hypoxic tooth germs.

Conclusions:

• ONBs are effective in targeted oxygen delivery to hypoxic developing tissues.
• ONBs can restore critical cellular processes including proliferation, apoptosis, and metabolism.
• ONB-based strategies show promise for treating developmental defects caused by hypoxia.