Regenerating aged bone marrow via a nitric oxide nanopump

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Gerontology

Background:

• Cellular senescence in aged bone marrow LepR+ cells impairs regenerative capacity.
• Aging affects osteoblast and other cell lineages derived from bone marrow.

Purpose of the Study:

• To develop a nitric oxide (NO) nanopump for rejuvenating senescent LepR+ cells in aged bone marrow.
• To investigate the potential of in situ NO release for countering age-related bone marrow disorders.

Main Methods:

• Constructed a LepR+ cell-targeting NO nanopump using amphiphilic polymers.
• Co-entrapped a chemiluminescence substrate and NO donor for self-controlled NO release.
• Utilized H2O2-triggered chemiluminescence to activate NO release in situ.

Main Results:

• The NO nanopump successfully rejuvenated senescent LepR+ cells in aged bone marrow.
• In situ NO release activated glycolysis signaling in senescent LepR+ cells.
• Regeneration of osteoblastic and other bone marrow niches was observed in vivo.

Conclusions:

• The developed NO nanopump is a promising therapeutic tool for aging-induced bone marrow disorders.
• Targeted NO delivery can reverse cellular senescence and restore bone marrow regenerative function.