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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Marine Biotechnology

Background:

  • Polysaccharide biopolymer nanoparticles are promising for osteogenic differentiation.
  • Marine macroalga Gracilaria salicornia yields GS-AgNPs with potential osteogenic effects.

Purpose of the Study:

  • To investigate the osteogenic potential of GS-AgNPs derived from Gracilaria salicornia.
  • To evaluate the effect of GS-AgNPs on human mesenchymal osteoblast stem cells (hMSCs) and M2 macrophages.

Main Methods:

  • GS-AgNPs were isolated from Gracilaria salicornia.
  • Alkaline phosphatase activity and mineralization assays were performed on hMSCs.
  • Osteocalcin and bone morphogenic protein-2 (BMP-2) expression were analyzed in M2 macrophages using fluorescence-activated cell sorting.
  • Cell viability was assessed using time-dependent studies.

Main Results:

  • GS-AgNPs significantly elevated alkaline phosphatase activity in hMSCs (88.9 mU/mg vs. 33.7 mU/mg).
  • Intense mineralized nodule formation was observed on hMSC surfaces treated with GS-AgNPs.
  • Increased populations of osteocalcin (78.64%) and BMP-2-positive cells (46.10%) were noted in M2 macrophages.
  • GS-AgNPs demonstrated a non-cytotoxic nature in time-dependent cell viability studies.

Conclusions:

  • GS-AgNPs exhibit significant osteogenic effects, promoting differentiation and mineralization.
  • The non-cytotoxic nature and bioactive properties suggest GS-AgNPs are promising for osteogenesis therapy and metabolic bone disorder treatment.