Funded Projects

Chronic pain from tissue injury often stems from long-term changes in spinal cord circuits that change nerve sensation. Reversing these changes may provide better pain therapeutics. Previous work in animal models showed that activating G protein-coupled receptor 37 (GPR37) dampens nerve signal intensity after long-term stimulation and alleviates pain behavioral responses. This project aims to validate GPR37 in the spinal cord as a useful target for new treatments for neuropathic pain. The work will facilitate screening and identification of new molecules that activate GPR37, which can then be tested for efficacy and safety in further research in animal models of pain.

The Family School Partnership (FSP) and classroom-centered (CC) interventions targeted aggressive-coercive behavior and poor academic achievement as antecedents of the distal outcomes of antisocial behavior, substance abuse/dependence, psychiatric symptoms/disorders, high-risk sexual behavior and successful adaptation to the relevant developmental demands of the educational, work, romantic relationships and family (both family of procreation and origin/orientation) social fields/contexts. The participants of the FSP and CC original prevention trial were a population (n = 798) of urban, predominately African-American young adults, who began first grade in the fall of 1993 in nine elementary schools in predominantly low- to lower-middle-income Baltimore areas. The central purpose of the proposed study is to extend through ages 31-35 an examination of normal and pathogenic development and the impact of these two universal first-grade preventive interventions on the distal targets mentioned above. We will continue to study the role of phenotypic and genetic factors (and their interactions) as well as the impact of the interventions on the development and course of substance use/abuse/dependence, psychiatric symptoms/disorders, antisocial behavior/disorder and high-risk sexual behavior through young adulthood. The knowledge accrued over the course of the proposed assessments should serve to inform the nature, targets and timing of our future preventive intervention efforts.

Research shows that individuals with chronic pain may experience brain changes that contribute to anxiety, depression, and cognitive impairment. This project will test a user-friendly, home-based device to treat chronic pain. The device stimulates the brain through olfactory training: repetitive daily stimulation with specific smells. The research will optimize a treatment approach and test the device in a clinical study.

Since 2002, persons with opioid use disorders who desire medication-assisted treatment can be treated with buprenorphine, which has been shown to be efficacious. Buprenorphine treatment can occur in any medical office-based setting, is prescribed by any physician who seeks to become waivered, and is taken by patients at home unsupervised. However, without visual confirmation of medication ingestion, providers remain unsure if patients divert part or all of their buprenorphine medication. This project will develop the technical and logistical workflow needed to implement a video-­based application, miDOT, for office-­based buprenorphine monitoring during the initial months of care, which will allow health care providers to monitor whether patients ingest the drug and adhere to treatment. The project will configure a video-based DOT platform, evaluate its effectiveness in securing medication ingestion and care retention for illicit opiate users, and solidify routes of sustainable commercial viability with commercial partners.

Data from 2015 show that American Indians/Alaska Natives (AI/AN) have the highest rates of diagnosis for opioid use disorder (OUD) and death from drug overdose. Of particular concern is the prevalence in emerging adults (ages 18-25), as this is a developmental period of heightened vulnerability and critical social, neurological, and psychological development. This study will develop and implement a culturally centered intervention to address opioid misuse among urban AI/AN emerging adults in California: POMANAYA (Preventing Opioid Misuse Among Native American Young Adults). POMANAYA will developed by adapting and enhancing our existing culturally sensitive prevention intervention program that uses motivational interviewing in AI/AN youth to address social network factors in emerging adults that amplify (or reduce) opioid and other drug use risk. Results from this study could significantly advance scientific knowledge and clinical practice for AI/AN emerging adults.

MNK-eIF4E signaling is activated in nociceptors upon exposure to pain or peripheral nerve injury, promoting cytokines and growth factors and increasing nociceptor excitability, which leads to neuropathic pain. Genetic or pharmacological inhibition of MNK signaling blocks and reverses nociceptor hyperexcitability as well as behavioral signs of neuropathic pain. A clinical phase drug for cancer shows strong specificity as an MNK inhibitor but requires optimization because MNK inhibition in the central nervous system (CNS) may lead to depression, an unacceptable side effect for a neuropathic pain drug. The research team plans a targeted medicinal chemistry and screening campaign directed at generating a MNK-inhibitor-based neuropathic pain treatment with the goal of restricting its CNS penetration while retaining potency, specificity, and in vivo bioavailability and efficacy.

Pain in the muscles and surrounding connective tissues (myofascial pain) can affect many regions of the body and is a key component of chronic low back pain. Patients with chronic low back pain have a range of musculoskeletal problems perpetuating their pain. There is a significant clinical need to identify the components of myofascial pain in people with chronic low back pain. Advances in ultrasound technology have allowed researchers to identify several differences in muscle and connective tissues related to myofascial pain. This project will develop and validate an ultrasound-based biomarker signature for myofascial pain in the low back. This research will also refine the biomarker signature using advanced machine learning approaches, toward future testing in in a randomized controlled clinical trial.

One of the most debilitating consequences of spinal cord injury is the development of chronic neuropathic pain, which is difficult to manage with existing pain treatments. Animal models and behavioral assays that better reflect the conditions in humans are urgently needed to help in identification of novel pain treatments. This project aims to develop a new model of spinal cord injury-related neuropathic pain using pigs, because they are similar to humans in anatomy, size, metabolism, physiology, and the way their bodies process drugs.

The opioid antagonist naltrexone (NTX) is a proven treatment for opioid use disorder (OUD); however, lack of adherence is a serious limitation that has prevented NTX from reaching its maximum therapeutic potential. To address this limitation, BioCorRx is developing BICX102, a subcutaneous solid depot pellet of NTX, a single implantation of which can provide continual blockade of opioid receptors for up to 3 months. This can prevent patients from being adversely affected by almost any opioid relapse event, while improving efficacy and adherence to behavioral programs that support long-term management and recovery. This proposal comprises the steps required to achieve FDA approval. Successful development of BICX102 would result in a safe and effective 3-month subcutaneous depot pellet/implant containing NTX (1,000 mg) that would be far less reliant on patient compliance.

Non-steroidal anti-inflammatory drugs (NSAIDs) are a first line pharmacologic pain therapy for chronic musculoskeletal pain, and rheumatoid arthritis (RA) and moderate to severe osteoarthritis (OA) specifically. However, insufficient pain relief by NSAID monotherapy has encouraged the use of combination therapy. Combinations of NSAIDs plus weak opioids are widely used although objective evidence for efficacy is limited and they have many adverse events.  A growing body of evidence suggests that ?2/?3 subtype-selective positive allosteric modulators (PAM) of the ?- aminobutyric acid A receptor (GABAAR) may effectively restore central pain regulatory mechanisms thus providing effective relief of chronic pain with reduced prevalence and severity of side-effects.  Based on these promising preliminary studies and considerable supporting literature data, the research team will test the hypothesis that combination dosing of TPA-023B with an NSAID will work synergistically to suppress the acute and chronic pain components of chronic musculoskeletal pain. 

One of the most widely used treatments for chronic pain is opioid analgesics. Importantly, there is evidence of a pathological interaction between opioids and the immune system that can contribute to both opioid tolerance and elevated levels of pain. Chronic pain conditions for which opioids are most often prescribed have been shown to involve dysregulation of the immune system, which may contribute to pathological effects of opioid use in these patients. To address this unmet need, this study aims to develop a reliable, cost-effective, and non-invasive in vitro diagnostic assay for chronic pain with an underlying inflammatory pathology, as a blood test available in primary care settings, with the hope that doctors can use the test to identify which patients might benefit less from opioids and be more likely to become addicted.

New approaches that can effectively ameliorate acute and chronic migraine pain are urgently needed. Due to its critical roles in inducing migraine pain, CGRP and its receptor complex, the calcitonin receptor-like receptor (CLR) and receptor activity-modifying protein 1 (RAMP1) have been targeted for migraine treatment. A new strategy for targeting the CGRP-mediated signaling pathway is needed to meet the medical need of migraine patients. The team developed a group of long-acting CGRP/RAMP1-specific peptide super-antagonists that form gels in situ in aqueous solution. Based on this exciting finding, the investigators propose to develop and identify the most potent antagonistic analog candidates (Aim 1), and characterize the pharmacokinetics of gel depots made of the selected candidates in vivo (Aim 2). This feasibility study is needed to explore the translational potential of these newly invented super-antagonists for the treatment of chronic migraine in combination with conventional migraine agents. 

Chemokines (hormones of the immune system that mediate innate immune inflammation) enhance pain, reduce opioid analgesia, and promote drug-seeking behavior and addiction, giving them a central role at the crossroads of chronic pain and the opioid crisis. Blocking chemokines (rather than opioid receptors) provides an exciting treatment opportunity for both pain and opioid use disorder. This research continues previous work studying the efficacy of RAP-103, a small, orally stable chemokine receptor blocker. The previous research has shown that RAP-103 is safety and effective in preclinical models that mimic human drug-taking. This research will now optimize the dose required to achieve decreased motivation to maintain opioid use, establish manufacturing scale-up feasibility, provide RAP-103 for safety testing in animals, and conduct stability testing of RAP-103 toward the goal of submitting an Investigational New Drug application to the FDA.