Funded Projects

Spinal cord injury (SCI) impairs sensory transmission leading to chronic, debilitating neuropathic pain. While our understanding of the molecular basis underlying the development of chronic pain has improved, the available therapeutics provide limited relief. In the lab, we have shown the timing of exercise is critical to meaningful sensory recovery. Early administration of a sustained locomotor exercise program in spinal cord–injured rats prevents the development of neuropathic pain, while delaying similar locomotor training until pain was established was ineffective at ameliorating it. The time elapsed since the injury occurred also indicates the degree of inflammation in the dorsal horn. We have previously shown that chronic SCI and the development of neuropathic pain correspond with robust increases in microglial activation and the levels of pro-inflammatory cytokines. This proposal seeks to lengthen the therapeutic window where rehabilitative exercise can successfully suppress neuropathic pain by pharmacologically reducing inflammation in dorsal root ganglia.

TWIK-related spinal cord K+ (TRESK) channel is abundantly expressed in all primary afferent neurons (PANs) in trigeminal ganglion (TG) and dorsal root ganglion (DRG), mediating background K+ currents and controlling the excitability of PANs. TRESK mutations cause migraine headache but not body pain in humans, suggesting that TG neurons are more vulnerable to TRESK dysfunctions. TRESK knock out (KO) mice exhibit more robust behavioral responses than wild-type controls in mouse models of trigeminal pain, especially headache. We will investigate the mechanisms through which TRESK dysfunction differentially affects TG and DRG neurons. Based on our preliminary finding that changes of endogenous TRESK activity correlate with changes of the excitability of TG neurons during estrous cycles in female mice, we will examine whether estrogen increases migraine susceptibility in women through inhibition of TRESK activity in TG neurons. We will test the hypothesis that frequent migraine attacks reduce TG TRESK currents.

Voltage-gated sodium channels are responsible for the transmission of pain signals. Nine genes have been identified, each having unique properties and tissue distribution patterns. Genetic studies have correlated a hereditary loss-of-function mutation in one human Na+ channel isoform – ?Na?V?1.7 – with a rare genetic disorder known as Congenital Insensitivity to Pain (CIP). Individuals with CIP are not able to feel pain without any significant secondary alteration. Thus, selective inhibition of ?Na?V?1.7 in normal humans could recapitulate the phenotype of CIP. This research team developed a non-permanent gene therapy to target pain that is non-addictive (because it targets a non-opioid pathway), highly specific (only targeting the gene of interest), and long-term lasting (around 3 weeks in preliminary assays in mice). During this Phase I , the team will 1) test additional pain targets ?in vitro?, and 2) evaluate the new targets ?in vivo ?in mice models of inflammatory and neuropathic pain. 

Homeless youth have high rates of alcohol and drug use, comorbid mental health conditions, and are at high risk for suicide. However, few preventive interventions have been proven for reducing substance use or addressing suicide among homeless youth. Resolution of youth homelessness through housing and prevention services, often referred to as ?Housing First? (HF), will be tested in the HOME (Housing, Opportunities, Motivation and Engagement) study, which aims to reduce opioid use and progression to opioid use disorder (OUD). This study will include suicide screening, treatment, education and prevention (STEP) to the model to examine whether HF provides secondary benefits for reducing suicidal ideation and behaviors among high risk homeless youth. STEP includes ongoing suicide screening procedures and Cognitive Therapy for Suicide Prevention (CTSP) for those at high risk for suicide. Youth (N=240) will be randomly assigned to receive HF + STEP + opioid and related risk prevention services (strengths-based outreach and advocacy; HIV Prevention; and motivational Interviewing) or to receive STEP + opioid and related risk prevention services, alone. Results from this study will inform the design and implementation of other national models of HF to address prevention of substance use and suicidal ideation and behaviors among homeless youth.

Musculoskeletal pain is common, costly, and affects millions of Americans. Clinical guidelines strongly recommend complementary and integrative treatments such as physical therapy, but nearly half of people receiving physical therapy for musculoskeletal pain seek additional care. Additional treatments such as medication and surgery are more aggressive and carry higher risk. This project will use data from a large physical therapy dataset and nationwide medical claims data to investigate why some people do not respond well to physical therapy for musculoskeletal pain, toward finding safe and effective options for these individuals.

This project creates the HEAL Harm Reduction Network Coordination Center, which will provide support to the nine research studies in the HEAL Harm Research Reduction Network. The center will provide administrative and logistical help; support data harmonization and data sharing; involve stakeholders in all network activities; and share research findings and other products with researchers, practitioners, stakeholders, and the general public. 

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.

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.

Opioid use disorders (OUDs) in pregnancy are a U.S. public health crisis; the current standard of care is treatment with an opioid agonist such as buprenorphine (BPH), which has an associated risk for neonatal abstinence syndrome (NAS) and possible long-term neurodevelopmental consequences. As a novel treatment option for OUD in pregnancy, naltrexone would not expose the developing fetus to opioids, greatly reducing the risk for NAS and potentially improving maternal and infant outcomes. This study will evaluate the safety, efficacy, pharmacokinetics, and pharmacogenomics of naltrexone for pregnant women with OUDs, evaluating comprehensive mother-infant outcomes throughout the pregnancy and first year after birth. It will enroll 50 pregnant women stabilized pre-pregnancy on extended-release naltrexone (XR-NTX) and 50 comparison women on BPH from Boston Medical Center and the University of North Carolina in this multi-center prospective comparative cohort study.

Temporomandibular joint (TMJ) disorders, which affect the joint connecting the lower jaw and the skull, are common and difficult chronic pain conditions. Pain management strategies that harness the body’s own pain relief mechanisms (including placebo effects in which pain relief cannot be attributed to a specific treatment), can reduce the severity and duration of TMJ-related chronic pain. Although research suggests that placebo effects may have a genetic basis, few, if any, genetic studies have examined this possibility in individuals with TMJ disorders. This project will use in-depth genetic, sociodemographic, clinical, and psychological data collected from adults with chronic TMJ disorders to better understand how the placebo effect works.

The development of non-addictive pain therapeutics can help counter opioid addiction and benefit patients, including those who suffer from neuropathic pain, in particular diabetic neuropathic pain (DNP). This project’s goal is to develop a safe, efficacious, and non-addictive small-molecule drug that activates Kv7 voltage-gated potassium channels to address overactive neuronal activity in DNP. Researchers will discover Kv7 activators that favor Kv7 isoforms altered in DNP and found in dorsal root ganglia, decrease off-target side effects observed with the use of earlier non-biased Kv7 activators, and optimize the absorption, distribution, metabolism, excretion, and toxicity profiles of these activators. This screening paradigm is intended to establish a clinic-ready, well-tolerated, and widely effective product to treat neuropathic pain.

Neuropathic pain is a chronic and difficult to treat condition that affects people in different ways. This project aims to personalize treatments based on individual pain profiles. The research will develop an inexpensive test using a technique called quantitative sensory testing to predict how a patient will respond to two common pain medications. The research will also look for other factors in blood that enhance the accuracy of these predictions.