Funded Projects

Neuropathic pain conditions are exceedingly difficult to treat, and novel non-opioid analgesics are desperately needed. Receptomic and unbiased transcriptomic approaches recently identified the orphan G-protein coupled receptor (oGPCR), GPR160, as a major oGPCR whose transcript is significantly increased in the dorsal horn of the spinal cord (DH-SC) ipsilateral to nerve injury, in a model of traumatic nerve-injury induced neuropathic pain caused by constriction of the sciatic nerve in rats (CCI). De-orphanization of GPR160 led to the identification of cocaine- and amphetamine-regulated transcript peptide (CARTp) as a ligand which activates pathways crucial to persistent pain sensitization. This project will test the hypothesis that CARTp/GPR160 signaling in the spinal cord is essential for the development and maintenance of neuropathic pain states. It will also validate GPR160 as a non-opioid receptor target for therapeutic intervention in neuropathic pain, and characterize GPR160 coupling and downstream molecular signaling pathways underlying chronic neuropathic pain.

Hesperos uses microphysiological systems in combination with functional readouts to establish systems capable of analysis of chemicals and drug candidates for toxicity and efficacy during pre-clinical testing, with initial emphasis on predictive toxicity. The team constructed physiological systems that represent cardiac, muscle and liver function, and demonstrated a multi-organ functional cardiac/liver module for toxicity studies as well as metabolic activity evaluations. In addition, the team demonstrated multi-organ toxicity in a 4-organ system composed of neuronal, cardiac, liver and muscle components. While much is known about the cells and neural circuitry regulating pain modulation there is limited knowledge regarding the precise mechanism by which peripheral and spinal level antinociceptive drugs function, and no available human-based model reproducing this part of the pain pathway. The ascending pain modulatory pathways provide a well characterized neural architecture for investigating pain regulatory physiology. In this project, the research team propose a human-on-a-chip neuron tri-culture system composed of nociceptive neurons, GABAergic interneurons and glutamatergic dorsal projection neurons (DPN) integrated with a MEMS construct. Using this model, investigators will interrogate pain signaling physiology at three levels, 1) at the site of origin by targeting nociceptive neurons with pain modulating compounds including noxious stimuli and inflammatory mediators, 2) at the inhibitory GABAergic interneuron, and 3) at the ascending spinal level by targeting glutamatergic DPNs. These circuits will be integrated utilizing expertise in patterning neurons as well as integration with BioMEMs devices. This system provides scientists with a better understanding of ascending pain pathway physiology and enable clinicians to consider alternative indications for treating pain at peripheral and spinal levels. 

According to SAMHSA’s 2017 National Survey on Drug Use and Health (NSDUH), 11.4 million persons in the U.S. report past-year opioid misuse; out of them, only 2.1 million individuals met criteria for an OUD. Very little is known about efficacious interventions for those who do not meet criteria for moderate/severe OUD (i.e., subthreshold OUD). The prevalence of subthreshold OUD in primary care settings is 5 percent to 10 percent, with higher rates (21 percent to 29 percent) among those receiving prescribed opioids. Although they are at high risk of developing moderate/severe OUD and/or dying from an overdose, little or no empirical evidence exists for pragmatic prevention interventions that can be adopted at integrated general medical settings. To study the efficacy of prevention interventions to arrest the progression from risky opioid use, researchers will test the efficacy of a STOP intervention in primary care settings. STOP adopts an early intervention approach, based on a collaborative care model to prevent progression to moderate/severe OUD, and consists of a practice-embedded nurse care manager who provides patient education and supports the primary care provider (PCP) in engaging, monitoring and guiding patients who have risky opioid use; brief advice delivered to patients by their PCP; and phone counseling of patients by behavioral health providers to motivate and support behavior change. Researchers will determine whether STOP reduces risky opioid use and examine the impact of STOP on progression to moderate/severe OUD, overdose risk behavior and overdose events in adults with risky use of illicit or prescription opioids.

Most of the 200k Americans who undergo thoracotomy each year receive opiates to reduce postoperative pain because clinicians have few non-addictive, cost-effective choices to control the severe pain patients often experience in the first two weeks after surgery. Managing pain post-thoracotomy is critical to enable patients to take deep breaths and remove (via coughing) lung secretions that otherwise significantly increase risk of pneumonia and collapsed lung, hospital re-admission and morbidity. The most severe pain associated with thoracotomy is transmitted along the intercostal nerves, but no long-term analgesic or nerve block device exists that can provide safe and effective long-term reduction of pain. A reversible, patient-controlled, non- addictive, intercostal nerve block device would reduce suffering due to thoracotomy, broken ribs and herpes zoster. In this Phase I project, the team will develop a minimally invasive thermal nerve block device that can control nerve conduction by gently warming and cooling a short nerve segment between room temperature and warm water temperature. This novel approach is based on the discovery that warm and cool temperature mechanisms of nerve block are different and additive, enabling moderate-temperature nerve block by cycling neural tissues slightly above and below body temperature. Reversible thermal nerve blocks represent a completely new approach to managing pain.  

Hospital inpatient stays due to opioid-related health problems are a reachable moment for increasing access to treatment with medications for opioid use disorder (MOUD). Hospitalized patients with opioid use disorder (OUD) are at particularly high risk for morbidity, mortality, and high medical costs in the U.S. This study will substantially inform the care management of OUD in hospitalized patients. The project includes a comparative effectiveness research trial and an implementation research trial, which will lead to models of broad dissemination for treatment approaches to this largely unaddressed population. They will examine whether (1) in hospitals with addiction medicine consultation services, hospital-initiated extended-release buprenorphine (XR-BUP), compared with other OUD medications, results in increased engagement in treatment with MOUD following hospital discharge and (2) training hospitals without such consultation services on best practices for initiating MOUD using consultation service hubs improves medication uptake in hospitals and increased MOUD treatment engagement following discharge.

Correctional settings have the potential to serve as key players in linking individuals with opioid use disorder (OUD) to treatment and health services upon release. Many individuals with OUD are being treated with medications, but these efforts will be ineffective if they fail to connect people to OUD treatment upon release. The Transitions Clinic Network (TCN) program provides enhanced primary care and OUD treatment for people recently released from incarceration. In TCN, formerly incarcerated community health workers are embedded within primary care teams and address social determinants of OUD, provide social support, help patients build trust in the health system, and advocate in interactions with the criminal justice system. This study will assess the effectiveness of the TCN: Post Incarceration Addiction Treatment, Healthcare, and Social Support (TCN PATHS) intervention versus referral to standard primary care on opioid treatment cascade outcomes and whether housing, food access, criminal justice contact, and social support mediate this association.

Opioids like morphine and hydrocodone are generally the most effective therapeutics for treatment of moderate to severe pain. However, their use is limited by serious side effects: tolerance, constipation, respiratory depression, physical dependence, and high addictive potential. Alternative pain relievers with the analgesic potency of conventional opioids, but devoid of narcotic side effects, are an immediate need. The goal of this project is to develop and commercialize an alternative to conventional opioid analgesics with reduced side effects and without the addictive properties common to mu-opioid agonists, targeting a new molecule in the central nervous system. This project will perform the necessary preliminary studies to prepare this new molecule for an investigational new drug application with 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.

Buprenorphine (BUP) is an FDA-approved medication-assisted therapy (MAT) that improves outcomes and saves lives in patients with opioid use disorder (OUD). It is available in multiple dosage forms and routes of administration, including daily sublingual (SL) and buccal tablets and films, a monthly subcutaneous (SC) injectable, and a 6-month SC implant; however, these forms leave many patients untreated or undertreated. This product, in a partnership with Lyndra Therapeutics, aims to develop a once-weekly oral BUP dosage form for maintenance therapy for OUD, using a new oral dosage formulation developed by Lyndra. A long-acting oral BUP may address important limitations of current MATs by providing improved PK with less euphoria than SL, a patient- and provider-preferred route of administration, and an optimal dosing interval for improved patient adherence with the potential for cost-effective direct observed therapy.

Chronic low back pain (cLBP) is recurrent and often nonresponsive to conservative treatments. Biomechanists, physical therapists, and surgeons each utilize a variety of tools and techniques to assess and interpret qualitative movement changes to understand potential mechanical and neurological sources of low back pain and as critical elements in their treatment paradigm. However, objectively characterizing and communicating this information is currently impossible, since clinically feasible (i.e., cost-effective, objective, and accurate) tools and quantitative benchmarks do not exist. This research addresses the challenge to improve cLBP outcomes through the use of unique, inexpensive, screen-printable, elastomer-based, nanocomposite, piezoresponsive sensors, which will be integrated into a SPInal Nanosensor Environment (SPINE) sense system to measure lumbar kinematics and provide an objective, quantitative platform for diagnosis, monitoring, and follow-up assessment of cLBP.

Effective treatment for OUD has been shown to improve patient outcomes and reduce health care costs; however, evidence of this effect in primary care settings is severely limited. The health economic findings from this study will supplement the parent PROUD trial’s results regarding clinical effectiveness and implementation outcomes and provide critical contextual information for health systems and other health care stakeholders. The study will evaluate the economic viability of the PROUD collaborative care model for OUD—that is, from the perspective of the health care sector, to what extent do the downstream cost savings associated with improved patient outcomes offset the additional costs of the PROUD intervention? The specific aims are to (1) estimate the start-up and ongoing management costs of the PROUD intervention, (2) assess costs associated with health care utilization for patients who receive primary care treatment in PROUD and usual care clinics and have been identified with recognized OUDs before clinic randomization, and (3) estimate the economic value of the PROUD intervention, measured as net monetary benefit (NMB, incremental benefit minus incremental cost), from the health care sector perspective.