Funded Projects

Opioid use during pregnancy is associated with significant harmful health outcomes for infants including preterm birth, neonatal opioid withdrawal syndrome, and impaired brain-related problems. This project will combine advanced imaging of the fetal brain and placenta, genetics, and tissue and blood samples from the placenta to determine how opioid use during pregnancy affects development of the fetal brain and placenta. This research will provide novel and early molecular indicators (biomarkers) to as well as identify new strategies for diagnosing, treating, and preventing opioid harm to the fetus and mother.

Social safety net programs and Medicaid that provide basic necessities such as shelter, health care, and food to people with low incomes are particularly important for women parents who use drugs. This project will examine the separate and combined impact of state social safety net program eligibility and administration on opioid-related behavioral outcomes for women parents experiencing poverty. Findings from this research will provide actionable recommendations for changes to these programs that may promote health and well-being for these women.

Multiple social determinants affect the health of youth experiencing homelessness. These include a lack of stable safe housing, income, education, food security, restricted access to services, as well as discrimination, victimization, and social isolation. This project will test the use of prevention efforts to address the factors that may be embedded within systems that serve this population, such as drop-in centers. The research will gather generalizable information about helping these youth along with cost estimates to inform future implementation efforts.

Both an infant’s ability to regulate their emotions and infant-parent interactions are critical to healthy brain and behavioral development. Accurate assessment of these factors for research in laboratory settings is technically difficult and burdensome for participants. Next-generation methods that can be used at home, including wearable sensors and machine learning approaches, promise to make it easier to assess infants with prenatal substance exposures. This project will use remote sensing technologies and machine learning to characterize dynamic real-time infant emotion regulation and infant-caregiver interactions throughout the day and in the home.

Medications used to treat opioid use disorder (OUD) such as methadone and buprenorphine can cause central sleep apnea—a condition in which an individual momentarily stops breathing during sleep. This project will evaluate whether central sleep apnea, by worsening sleep quality and causing low blood oxygen levels, leads to nighttime arousal and emotional distress, which in turn increases the risk of relapse in individuals receiving treatment for OUD.

People who use opioids, as well as those who take medications approved by the U.S. Food and Drug Administration for opioid use disorder (OUD), report significant problems with sleep and biological rhythms. This project will explore the activity of a novel group of photosensitive neurons in the retinas, a potential source for sleep disturbances in these individuals. The research could lead to new treatment strategies and responses, but also may identify a non-invasive, circadian biomarker to predict recovery and relapse in people with OUD.

As many as 64% of patients with Temporomandibular Joint Disorders (TMJDs) report symptoms consistent with Irritable Bowel Syndrome (IBS). However the underlying connection between these comorbid conditions is unclear and treatment options are poor. As such, pain management for these Chronic Overlapping Pain Conditions (COPCs) is a challenge for physicians and patients. This project will determine whether the convergence of pain from different peripheral tissues and perceived stress occurs in the brain and elicits a change in central neural processing of painful stimuli. This project will identify and validate specific lipids, enzymes and metabolic pathways that change expression in the brain during the transition from acute to chronic overlapping pain that can be therapeutically targeted to treat COPCs. Multi-disciplinary approaches will be used to combine brain imaging, visualization of spatial distribution of molecules, genetics, pharmacological and behavioral research techniques.

Validation of novel pain targets is a critical step toward the development of new non-addictive therapeutic agents for chronic pain management. Recent findings suggest that nerve injury-induced concurrent upregulation of the calcium channel alpha-2delta-1 subunit (CaValpha-2-delta-1) and thrombospondin-4 (TSP4) proteins in sensory and spinal cord neurons contributes to neuropathic pain development. Specifically, induction of aberrant excitatory synapse formation and sensitization of neurotransmission in spinal cord underlies this process; accordingly, a target site has been identified in the TSP4 that plays a critical role in mediating these pathological changes upon interaction with the CaValpha-2-delta-1 protein. This project will validate this novel target site in TSP4 for development of non-addictive pain medications, utilizing multidisciplinary approaches to investigate if blocking and genetic deletion of the target site can block or prevent the development of chronic pain state, aberrant excitatory synapse formation, and spinal cord neuron sensitization after injury in multiple rodent neuropathic pain models.

Many non-opioid drugs target G Protein-Coupled Receptors (GPCRs), a family of proteins involved in many pathophysiological processes including pain, fail during clinical trials for unknown reasons. A recent study found GPCRs not only function at the surface of nerve cells but also within a cell compartment called the endosome, where their sustained activity drives pain. This study will build upon this finding and test whether the clinical failure of drugs targeting plasma membrane GPCRs is related to their inability to target and engage endomsomal GPCRs (eGPCRs). This study will use stimulus-responsive nanoparticles (NP) to encapsulate non-opioid drugs and selectively target eGPCR dyads to investigate how eGCPRs generate and regulate sustained pain signals in neuronal subcellular compartments. This study will also validate eGCPRs as therapeutic targets for treatment of chronic inflammatory, neuropathic and cancer pain. Using NPs to deliver non-opioid drugs, individually or in combinations, directly into specific compartments in nerve cells could be a potential strategy for new pain therapies.

Sublingual buprenorphine is a standard treatment for opioid use disorder and is considered safe and effective. However, in 2022 the U.S. Food and Drug Administration advised that buprenorphine is linked to oral disease. However, the underlying studies did not measure when oral disease started, how it progressed, or if other risk factors were present. How sublingual buprenorphine may impact oral health also remains unclear. This project will follow adults in two U.S. states who take sublingual buprenorphine or other medications for opioid use disorder to understand if and how these medications increase the extent, onset, and progression of oral disease, accounting for other risk factors.

Recently, concerns have been voiced that medications to treat opioid use disorder (OUD) may contribute to dental problems, including cavities and tooth loss. These concerns may contribute to barriers preventing use of these medications. A better understanding of the effects of these medications on oral complications is critical. This project will use national databases to link dental, medical, and pharmacy claims data for Medicaid- or commercially-insured new users of various medications for OUD to determine and compare oral health outcomes. The project will also examine the perspectives and experiences of people with OUD on oral health.

Interstitial cystitis/bladder pain syndrome is a debilitating disease affecting many women. Opioid-based pain management is a common feature of current treatment approaches but is associated with the risk of addiction. The causes of this disorder remain unknown, and no effective treatments are available. This project will provide new insights using genetic, medication-based and other approaches in a mouse model, along with single-cell gene expression studies conducted with cells from mice and human patients who have this condition. The analyses will help provide targeted, safe, and effective treatment approaches for individuals with interstitial cystitis/bladder pain syndrome.

This study will challenge current clinical approaches to managing the pregnant woman with opioid use disorder. Dosing of buprenorphine (BUP) in pregnant women is based on studies in non-pregnant subjects, which suggests that symptoms of withdrawal occur when plasma BUP concentrations are < 1ng/ml. No such data exist for pregnant women, but this is a prerequisite for defining an appropriate dosing regimen of BUP in pregnant women. We will define this threshold by monitoring women undergoing mild, medically directed withdrawal. The Clinical Opioid Withdrawal Scale score and the Finnegan score for NAS are key to defining when withdrawal occurs and thus dictate treatment in mother and baby. Neither scoring system is based on plasma BUP concentrations and thus, may not reflect true opioid withdrawal. This proposal aims to develop physiologic-based scoring systems that refine the accuracy of diagnosis and optimize treatment.