Local Delivery of Non-opioid Analgesic Microparticles to Modulate Post-surgical Pain

Area of Science:

• Pharmacology
• Biomaterials Science
• Pain Management

Background:

• Postsurgical pain (PSP) is a frequent complication, potentially leading to chronic pain and opioid dependence.
• Current analgesics have limitations, including short action durations and adverse effects.
• Novel strategies are needed for effective and sustained pain management.

Purpose of the Study:

• To develop and evaluate extended-release bupivacaine microparticles (BuMPs) for improved postsurgical pain management.
• To assess the efficacy of BuMPs in providing sustained local analgesia.
• To explore a non-opioid alternative for managing postsurgical pain.

Main Methods:

• BuMPs were fabricated using PLGA via a hydrogel template method.
• Efficacy was evaluated in a mouse sciatic nerve injury (SNI) model of neuropathic pain.
• Mechanical hypersensitivity was measured using the von Frey test over 21 days; comparisons included blank microparticles and liposomal bupivacaine.

Main Results:

• BuMPs demonstrated uniform size distribution and extended bupivacaine release in vitro and in vivo.
• BuMP-treated mice showed significantly reduced mechanical hypersensitivity compared to controls in the SNI model.
• Analgesic effects were sustained for up to 21 days, indicating effective modulation of postsurgical and neuropathic pain.

Conclusions:

• BuMPs represent a promising non-opioid strategy for long-acting postsurgical pain management.
• A single perioperative injection of BuMPs may reduce opioid reliance and enhance patient recovery.
• BuMPs could serve as a valuable complementary therapy in pain management protocols.