Funded Projects

Opioid use disorders (OUD) are a national public health emergency with more than 115 fatal overdoses occurring each day in the U.S. and an economic burden of more than $78 billion a year. Several medications are available for treating OUD, but their access is limited and efficacy is often sub-optimal. It is thus urgent to develop new, affordable strategies for the effective treatment of OUD. Immunopharmacotherapy has emerged as a promising treatment approach against OUD that relies on the induction of drug-specific antibodies to neutralize circulating drug molecules and reduce or cancel their effects. Several groups have attempted to apply this strategy with mixed results, suggesting that novel immunization platforms must be tested to further improve vaccine efficacy against OUD. This project will fabricate novel nanoparticle-based vaccines against OUD that are likely to boost their immunogenicity and lead to a more robust and effective immune response against the target opioid. The broad impact of this project resides in the rational design of nanoparticle-based vaccines that are safe and effective against opioids. This novel nanoparticle-based immunization strategy can be applied to the development of next-generation vaccines against a range of OUD and other substance use disorders.

Although effective, current pharmacotherapies for opioid use disorder (OUD) present serious limitations. For example, methadone, a mu opioid receptor (MOP) full agonist, has significant abuse liability and causes withdrawal after chronic use, while buprenorphine (Bup), an MOP partial agonist and kappa opioid receptor (KOP) antagonist, produces limited respiratory depression and is less effective than methadone in reducing drug use, craving, and relapse. To address the limitation of currently available MATs, this project uses a phased plan that will fast-track the IND development of a next-generation medication for OUD based on small-molecule compounds targeting the nociception opioid receptor (NOP)—with no misuse or dependence liability—that have shown promising efficacy in reducing oxycodone intake in rhesus monkeys trained to self-administer, with efficacies similar to that of buprenorphine. The project’s ultimate goal is to file an IND application for an NOP agonist as a promising new approach to treat illicit and prescription OUD that may offer an alternative to buprenorphine.