Multitargeted biological actions of polydatin in preventing pseudogout acute attack

Area of Science:

• Biochemistry
• Immunology
• Pharmacology

Background:

• Polydatin (PD) has demonstrated protective effects against calcium pyrophosphate (CPP) crystal-induced arthritis in previous studies.
• Understanding the underlying mechanisms of PD's anti-inflammatory action is crucial for its therapeutic development.

Purpose of the Study:

• To elucidate the molecular mechanisms by which polydatin (PD) exerts its anti-inflammatory effects against calcium pyrophosphate (CPP) crystal-induced arthritis.
• To investigate the role of SIRT1 and leukocyte migration pathways in PD's therapeutic action.

Main Methods:

• Acute arthritis was induced in mice via CPP crystal injection; animals received prophylactic treatment with PD or colchicine.
• Histological analysis, muscle strength testing, protein arrays, and in vitro assays (monocyte stimulation, chemotaxis) were employed.
• Specific inhibitors and ELISA were used to assess inflammatory mediators, leukocyte migration, and SIRT1 involvement.

Main Results:

• PD treatment significantly reduced ankle swelling and inflammatory damage in joints and gastrocnemius muscles caused by CPP crystals.
• PD modulated inflammatory pathways, including leukocyte migration and angiogenesis, and reduced pro-inflammatory cytokines and VEGF in vitro.
• PD's anti-inflammatory effects were linked to SIRT1 activation and inhibition of CCR-1, which reduced monocyte activation and PBMCs migration.

Conclusions:

• Polydatin (PD) effectively prevents inflammatory responses to CPP crystals in mice, preserving articular and muscular integrity.
• The anti-inflammatory properties of PD are mediated by regulating leukocyte migration and suppressing pro-inflammatory mediators, with a key role for SIRT1 activation.