Interaction of Staphylococcus aureus with osteoblasts (Review).

Area of Science:

• Orthopedics
• Infectious Diseases
• Cell Biology

Background:

• Orthopedic infections are challenging to treat, with Staphylococcus aureus (S. aureus) being a primary cause.
• S. aureus can colonize bone and invade osteoblasts, contributing to persistent osteomyelitis.
• Bacterial invasion of osteoblasts involves cytoskeletal elements, particularly actin microfilaments.

Purpose of the Study:

• To elucidate the role of osteoblast invasion by S. aureus in the pathogenesis of orthopedic infections.
• To understand the mechanisms by which S. aureus persists within osteoblasts.
• To investigate the contribution of S. aureus-infected osteoblasts to inflammatory responses and bone destruction.

Main Methods:

• Analysis of S. aureus invasion mechanisms into osteoblasts.
• Investigation of cytoskeletal involvement (actin microfilaments, microtubules, clathrin-coated pits) in bacterial internalization.
• Assessment of S. aureus survival within osteoblasts.
• Evaluation of osteoblast-derived cytokine expression and recruitment of immune cells.
• Observation of osteoblast apoptosis and osteoclast recruitment.

Main Results:

• S. aureus invades osteoblasts, with microfilaments being crucial for this process.
• S. aureus survives intracellularly within osteoblasts, exhibiting reduced antibiotic sensitivity.
• Infected osteoblasts release cytokines, recruiting leukocytes and phagocytes.
• Osteoblast apoptosis and subsequent osteoclast recruitment contribute to bone resorption.

Conclusions:

• Osteoblast invasion by S. aureus is a key factor in the persistence and recurrence of orthopedic infections.
• Intracellular S. aureus is difficult to eradicate due to reduced antibiotic penetration and contributes to inflammatory bone destruction.
• Targeting bacterial invasion and intracellular survival mechanisms may offer new therapeutic strategies for osteomyelitis.