Orexin A alleviates neuroinflammation via OXR2/CaMKKß/AMPK signaling pathway after ICH in mice.

BACKGROUND: Orexins are two neuropeptides (orexin A, OXA; orexin B, OXB) secreted mainly from the lateral hypothalamus, which exert a wide range of physiological effects by activating two types of receptors (orexin receptor 1, OXR1; orexin receptor 2, OXR2). OXA has equal affinity for OXR1 and OXR2, whereas OXB binds preferentially to OXR2. OXA rapidly crosses the blood-brain barrier by simple diffusion. Many studies have reported OXA's protective effect on neurological diseases via regulating inflammatory response which is also a fundamental pathological process in intracerebral hemorrhage (ICH). However, neuroprotective mechanisms of OXA have not been explored in ICH. METHODS: ICH models were established using stereotactic injection of autologous arterial blood into the right basal ganglia of male CD-1 mice. Exogenous OXA was administered intranasally; CaMKKß inhibitor (STO-609), OXR1 antagonist (SB-334867), and OXR2 antagonist (JNJ-10397049) were administered intraperitoneally. Neurobehavioral tests, hematoma volume, and brain water content were evaluated after ICH. Western blot and ELISA were utilized to evaluate downstream mechanisms. RESULTS: OXA, OXR1, and OXR2 were expressed moderately in microglia and astrocytes and abundantly in neurons. Expression of OXA decreased whereas OXR1 and OXR2 increased after ICH. OXA treatment significantly improved not only short-term but also long-term neurofunctional outcomes and reduced brain edema in ipsilateral hemisphere. OXA administration upregulated p-CaMKKß, p-AMPK, and anti-inflammatory cytokines while downregulated p-NFκB and pro-inflammatory cytokines after ICH; this effect was reversed by STO-609 or JNJ-10397049 but not SB-334867. CONCLUSIONS: OXA improved neurofunctional outcomes and mitigated brain edema after ICH, possibly through alleviating neuroinflammation via OXR2/CaMKKß/AMPK pathway.

Telehealth in opioid use disorder treatment: policy considerations for expanding access to care.

The Ryan Haight Online Pharmacy Consumer Protection Act of 2008 was intended to address the online diversion of controlled substances. However, it inadvertently limited access to care for patients seeking medications for opioid use disorder (MOUD). During the COVID-19 pandemic, temporary flexibility in telemedicine prescriptions for MOUD were implemented. Now, with the conclusion of the public health emergency, policymakers need to develop strategies to maintain some of the lifted restrictions in order to maintain increased access to care for patients with opioid use disorder (OUD). One potential solution to address these issues is the implementation of a hybrid model combining outpatient clinics and telemedicine. This model offers the opportunity to maintain the benefits of telemedicine while ensuring comprehensive and safe care for OUD patients.