Time-Lapse Evaluation of Interactions Between Biodegradable Mg Particles and Cells

Area of Science:

• Biomaterials Science
• Cell Biology
• Medical Device Engineering

Background:

• Magnesium-based implants are promising biodegradable materials for orthopedic, dental, and cardiovascular applications.
• Wear and degradation of these implants release microdebris, necessitating study of their biological interactions.
• Understanding cellular responses to these microdebris is crucial for safe and effective medical applications.

Purpose of the Study:

• To evaluate the interaction between magnesium particles (MgPa) and cells using time-lapse multidimensional microscopy (MM).
• To assess the impact of MgPa, particularly those treated with potassium fluoride, on macrophage and osteoblast behavior.
• To compare the efficacy of MM with standard assays like LDH and WST-1 for evaluating biomaterial-cell interactions.

Main Methods:

• Time-lapse multidimensional microscopy (MM) was used to observe cell-particle interactions over 24-hour periods.
• Lactate dehydrogenase (LDH) and WST-1 assays were employed to measure membrane damage and mitochondrial activity, respectively.
• Protein profiles and adhesion-associated protein expression were analyzed.

Main Results:

• MM demonstrated magnesium particle interactions with macrophages (J774), causing altered cell size, morphology, reduced duplication, and damage.
• Corrosion products and hydrogen development were observed on particles, with more significant changes after potassium fluoride treatment.
• Macrophages exhibited a greater concentration-dependent response to MgPa compared to osteoblasts (MC3T3-E1), showing more significant alterations in viability and cell cycle.
• Protein expression related to cell adhesion was affected by MgPa presence.

Conclusions:

• Time-lapse MM is an effective tool for real-time, in situ monitoring of biodegradable material interactions with the biological environment.
• Macrophages are more sensitive to magnesium particle degradation products than osteoblasts.
• Findings provide valuable insights for the development and safety assessment of magnesium-based biodegradable biomaterials.