Funded Projects

Chronic pain is a significant public health problem associated with tremendous personal and economic burden. First-line treatment consists of opioid medications, but despite only moderate efficacy and unpleasant side effects, rates of opioid prescriptions have quadrupled over the past 15 years, and this has contributed to high rates of misuse, overdose, and mortality. Clearly, alternative, or non-opioid strategies for treating pain are needed. In this context, “opioid-sparing” medications refer to compounds that can be combined with and enhance the analgesic effects of lower-dose opioids without increasing the rewarding properties of either drug. There is preclinical evidence suggesting that cannabidiol (CBD) may have the potential to function as “opioid-sparing” medications, but its ability to alter opioid-mediated analgesia in humans has yet to be determined. This proposal will fill this gap by conducting a double-blind, placebo-controlled, within-subject randomized crossover study of the effects of CBD and morphine co-administration on pain sensitivity and subjective reinforcement on 28 healthy males and females. This is the first known study to investigate the ability of CBD to alter morphine’s analgesic effects in humans. If successful, the model will have a lasting impact on our ability to develop and test medications that reduce our reliance on chronic use of opioid medications for pain relief.

Kinoxis has developed a novel small-molecule lead, KNX100, that reduces the severity of opioid withdrawal symptoms in preclinical animal models of opioid use disorder (OUD). KNX100 was discovered from a phenotypic screen of compounds derived from a fragment-based drug discovery program targeting the brain oxytocin system. KNX100 has a favorable pharmacokinetic and safety profile and has undergone testing for efficacy signals in two rodents and two non-human primate species. The proposed activity is to progress the development of KNX100 to treat opioid withdrawal in OUD. The overall objective of the project is to establish the safety and tolerability of KNX100 to enable human efficacy testing to commence in patients requiring treatment for opioid withdrawal. The long-term objective for this development program is to generate human efficacy data to support KNX100 as a potential treatment for opioid withdrawal symptoms and ultimately enable a New Drug Application to the FDA.

Millions of Americans undergo surgery each year, with fewer than half of patients reporting adequate postoperative pain relief and approximately 75 percent reporting moderate to severe postoperative pain. Gaps in postoperative pain management that lead to the unnecessary introduction and over-prescription of opioids continue to exacerbate the opioid crisis, but virtual reality (VR) has been demonstrated to be an effective strategy for pain management. This project will enhance and improve the functionality of a VR-based technology, AppliedVR, to provide acute perioperative pain management through a new software-based VR medical device, RelieVRx™. As a non-opioid alternative intended to reduce postoperative pain, RelieVRx can potentially reduce the need for and utilization of opioids in the postoperative setting.

Stigma is a key barrier to retention in medication-based treatment for opioid use disorder, particularly among low-income, minority individuals. Stigma that exists at multiple levels contributes to poor retention in care, including internalized and anticipated stigma at the individual level, as well as enacted stigma at the health care provider- and community levels. There is an urgent need to develop and evaluate innovative strategies to reduce stigma at these multiple levels among low-income, racial/ethnic minority individuals to improve engagement in care. One of the most promising strategies to reduce multiple intersecting stigmas simultaneously and improve engagement in care for low-income, minority individuals is through the use of peer recovery coaches (PRCs). PRCs, individuals who have gone through the recovery process themselves and are typically state-certified, have been shown to be more acceptable for engaging and retaining low-income, racial/ethnic minority patients in treatment compared to other health workers. However, scarce research has formally evaluated the effects of PRCs on stigma. This study will test how a PRC model can reduce multiple intersecting stigmas among low-income, racial/ethnic minority individuals to improve retention in methadone treatment.

Opioids remain the gold standard for treating moderate to severe pain, but their use is limited by numerous adverse effects, including tolerance, dependence, abuse, and overdose. Adverse effects could be avoided by combining an opioid with another drug, such that smaller doses of the opioid (in combination with another drug) produce the desired therapeutic effect. Direct-acting serotonin type 2 (5-HT2) receptor agonists interact in a synergistic manner with the opioid morphine to produce antinociceptive effects, suggesting a 5-HT2 receptor agonist could be combined with small amounts of an opioid to treat pain, thereby lowering the risk associated with larger doses. Unfortunately, very little is known about interactions between 5-HT2 receptor agonists and other opioids. The proposed studies will evaluate the therapeutic potential of mixtures of opioids and 5-HT2 receptor agonists using highly translatable and well-established procedures to characterize the antinociceptive, respiratory-depressant (overdose), positive-reinforcing (leading to misuse), and discriminative-stimulus (subjective) effects of drug mixtures as well as the impact of chronic treatment on the development of tolerance to and physical dependence on opioids. If successful, these studies will provide proof-of-concept for this innovative approach to pain treatment and evaluate the utility of targeting 5-HT receptors for analgesic drug development.

There is an urgent need to prevent and reduce opioid use disorder (OUD) by reducing the need for opioid analgesia and preventing the escalation of opioid dosing in patients at greater risk of using more opioids following surgery. Brivoligide is a non-opioid drug candidate that can alter the course of postoperative pain for patients most likely to suffer increased pain and utilize more opioids following surgery. A single administration of brivoligide at the time of surgery can reduce acute postoperative pain in these patients by 30 percent to 40 percent beyond what can be achieved with the current standard of care for at least 28 days and reduce opioid utilization by 40 percent over a 3-month period following surgery. This project will support the research necessary to achieve regulatory approval of brivoligide with a broad indication, which will initially focus on the reduction of postoperative pain following mastectomy, a soft-tissue surgery model suitable to detect long-term pain and opioid reduction benefits. Brivoligide appears to be a very promising pharmacotherapy with the potential to greatly contribute to stemming the tide in the opioid crisis.

American Indian and Alaska Native (AI/AN) youth and young adults experience disproportionately high rates of suicide, mental health disorders, traumatic life events, and substance use disorder. More effective, culturally informed interventions are needed that are tailored to the specific needs of this population. This supplement will examine how a person?s social network contributes to their behavioral health (suicide risk, mental health, substance use) status and how this network can be leveraged to improve the uptake of prevention interventions. The long-term goal is to disseminate and translate the lessons learned into practical policy, organizational changes, and preventive innovations that optimize patient-centered health outcomes and ultimately reduce or eliminate the dramatic and tragic suicide-related health disparities among urban AI/AN YYAs.

Very little research has been conducted on better understanding of phenotypic characterization of individuals with OUD (beyond DSM-5 diagnoses) and how these features predict illness severity, treatment retention or outcomes. The primary objective of the deep phenotyping study is to provide a comprehensive phenotypic characterization (e.g., domains of negative affect, reward salience, cognitive control, mental health) of a heterogeneous sample of individuals (n = 1,000) who currently meet one or more DSM-5 diagnostic criteria for OUD and are in treatment for OUD. In a subset of this sample (n = 100), the investigators conduct digital phenotyping to examine the utility of ecological momentary assessment (EMA), digital sensing and social media to predict retention, medication adherence and opioid use outcomes in patients receiving buprenorphine for OUD. It is anticipated that this foundational study will inform the feasibility and utility of such assessments that can be successfully embedded into imminent and future CTN and other OUD clinical trials.

For many reasons, the emergency department (ED) is a critical venue to initiate opioid use disorder (OUD) interventions. ED patients have a disproportionately high prevalence of substance use disorders and are at an elevated risk of overdose, and many do not access health care elsewhere. Despite this, OUD interventions are rarely initiated in EDs. The Emergency Department Connection to Care with Buprenorphine for Opioid Use Disorder study (CTN-0079) will assess the feasibility, acceptability and impact of introducing clinical protocols for screening for OUD, buprenorphine treatment initiation, and referral for ongoing treatment in ED settings with high need, limited resources and different staffing structures. This extension study will use the existing infrastructure to evaluate the adoption and sustainability of the clinical protocols introduced at each of the study sites and to identify factors influencing their diffusion and effectiveness.

People who use opioids in rural areas suffer worse health and less insurance coverage. The opioid problem in rural areas is of particular concern, as rural areas have higher overdose rates despite equivalent rates of OUD. This is because rural areas have a scant number of clinics and clinicians who provide medication treatment for OUD. Thus, people living in rural areas must travel long distances to access clinics that may or may not have expertise in providing treatment to patients with OUD. Telemedicine (TM) could efficiently increase capacity for delivery of buprenorphine in rural areas and may increase the number of patients receiving medication treatment and improve treatment retention and outcomes. While the development of medication treatments for opioid use disorder (MOUD) capacity in primary care settings with optimal/comprehensive services is desirable, the current opioid crisis with escalating overdose death rates in rural areas suggests a need to implement an efficient, cost-effective system of MOUD services that can be scaled up quickly. The use of a centralized and Medicare-covered TM vendor utilizing a developed methodology and established organizational infrastructure offers the great potential for a rapid rollout to increase access to MOUD and improve treatment retention in rural areas. This cluster randomized clinical trial with two phases will test expanded treatment access to improve retention on MOUD in highly affected rural areas. Phase I will include implementing telemedicine in a limited number of rural sites with varying levels of office-based opioid treatment (OBOT) to inform implementation strategies for the main trial, and Phase II will include evaluate comparative effectiveness between OBOT alone and OBOT + TM at 30 sites.

Individuals who have been previously incarcerated have a significantly higher risk of dying from opioid overdose, particularly in the first two weeks after release. Providing medication for opioid use disorder (MOUD) to individuals on probation or parole decreases the rate of relapse and recidivism, and increases retention in substance abuse treatment. This study will test a systems-change approach for increasing use of MOUD across a network of seven probation and parole sites to improve linkage to the continuum of evidence-based care for justice-involved individuals. Implementation outcomes include program acceptability, adoption, penetration, sustainability, and costs. Client-level effectiveness outcomes include retention, satisfaction, opioid use, opioid overdoses, recidivism, linkage to OUD treatment, and utilization of recovery services. Targeting the intersection of justice and community-based care has substantial potential for addressing the opioid crisis.

In order to address the opioid crisis, this group has developed a candidate heroin/opioid vaccine that induces antibodies that bind heroin/opioid upon injection and subsequently prevent the drug from crossing the blood-brain barrier and interacting with the brain's µ-opioid receptor. They completed pre-clinical testing of the vaccine candidate in mice and rats and demonstrated that the animals were protected from subcutaneous and intravenous heroin challenge. Ongoing durability studies have demonstrated that antibody titer and protective efficacy were maintained 6 months after the last vaccination. This project proposes to advance the development of the vaccine candidate by conducting a Phase I/IIa human clinical trial, by performing vaccine synthesis, nonclinical studies, and then a clinical trial. The supplemental award will allow for testing the efficacy of fentanyl haptens and of the combination heroin–fentanyl vaccine.