Comparative Risk of Injury with Concurrent Use of Opioids and Skeletal Muscle Relaxants.

Concurrent use of skeletal muscle relaxants (SMRs) and opioids has been linked to an increased risk of injury. However, it remains unclear whether the injury risks differ by specific SMR when combined with opioids. We conducted nine retrospective cohort studies within a US Medicaid population. Each cohort consisted exclusively of person-time exposed to both an SMR and one of the three most dispensed opioids-hydrocodone, oxycodone, and tramadol. Opioid users were further divided into three cohorts based on the initiation order of SMRs and opioids-synchronically triggered, opioid-triggered, and SMR-triggered. Within each cohort, we used Cox proportional hazard models to compare the injury rates for different SMRs compared to methocarbamol, adjusting for covariates. We identified 349,543, 139,458, and 218,967 concurrent users of SMRs with hydrocodone, oxycodone, and tramadol, respectively. In the oxycodone-SMR-triggered cohort, the adjusted hazard ratios (HRs) were 1.86 (95% CI, 1.23-2.82) for carisoprodol and 1.73 (1.09-2.73) for tizanidine. In the tramadol-synchronically triggered cohort, the adjusted HRs were 0.69 (0.49-0.97) for metaxalone and 0.62 (0.42-0.90) for tizanidine. In the tramadol-SMR-triggered cohort, the adjusted HRs were 1.51 (1.01-2.26) for baclofen and 1.48 (1.03-2.11) for cyclobenzaprine. All other HRs were statistically nonsignificant. In conclusion, the relative injury rate associated with different SMRs used concurrently with the three most dispensed opioids appears to vary depending on the specific opioid and the order of combination initiation. If confirmed by future studies, clinicians should consider the varying injury rates when prescribing SMRs to individuals using hydrocodone, oxycodone, and tramadol.

Polysubstance Use in Adults With Opioid Use Disorder Receiving Buprenorphine Maintenance.

INTRODUCTION: Studying polysubstance use is a public health recommendation. In the United Arab Emirates, more than 80% of adults with opioid use disorder (OUD) use 2 or more nonopioid substances. This secondary analysis contrasts the characteristics of polysubstance users (OUD + ≥1 nonopioid) with OUD, explores the correlates and predictors of nonfatal overdose, and examines the impact of polysubstance use on OUD treatment outcomes using buprenorphine (BUP). METHODS: This analysis uses data from a 16-week outpatient randomized controlled trial of 141 adults with OUD allocated to BUP + incentivized adherence and abstinence monitoring (n = 70) and BUP in usual care (control, n = 71). Outcomes were nonfatal overdose events over the preceding 12 months, positive drug screens, and treatment retention. Participant characteristics were contrasted, and bivariate statistical tests were conducted for simple associations followed by logistic regression. RESULTS: Polysubstance use was reported by 117 participants (82.9%), the majority of whom used pregabalin 72.1% (n = 75). Compared with OUD, polysubstance users observed higher arrests (median, 1.0 [interquartile range, 0.0-3.0] vs 0.5 [interquartile range, 0.0-2.0]; P = 0.04]) and nonfatal overdose events (n = 33 [31.8%] vs 2 [10.8%], P = 0.003). Carisoprodol and injecting drug use independently predicted nonfatal overdose (adjusted odds ratio, 4.519 [95% confidence interval, 1.81-11.22] and 2.74 [95% confidence interval, 1.15-6.51], respectively). No significant difference was observed in opioid use and retention in treatment outcomes between groups. CONCLUSION: Carisoprodol and injecting drug use increase the likelihood of nonfatal overdose in adults with OUD. Polysubstance use does not impact response to BUP treatment compared with OUD.

Comparative Risk of Opioid Overdose With Concomitant Use of Prescription Opioids and Skeletal Muscle Relaxants.

BACKGROUND AND OBJECTIVES: The concomitant use of prescription opioids and skeletal muscle relaxants has been associated with opioid overdose, but little data exist on the head-to-head safety of these drug combinations. The objective of this study was to compare the risk of opioid overdose among patients on long-term opioid therapy who concurrently initiate skeletal muscle relaxants. METHODS: We conducted an active comparator cohort study spanning 2000 to 2019 using healthcare utilization data from 4 US commercial and public insurance databases. Individuals were required to have at least 180 days of continuous enrollment and at least 90 days of continuous prescription opioid use immediately before and on the date of skeletal muscle relaxant initiation. Exposures were the concomitant use of prescription opioids and skeletal muscle relaxants, and the main outcome was the hazard ratio (HR) and bootstrapped 95% CI of opioid overdose resulting in an emergency department visit or hospitalization. The primary analysis quantified opioid overdose risk across 7 prescription opioid-skeletal muscle relaxant therapies and a negative control outcome (sepsis) to assess potential confounding by unmeasured illicit opioid use. Secondary analyses evaluated two-group and five-group comparisons in patients with similar baseline characteristics; individuals without previous recorded substance abuse; and subgroups stratified by baseline opioid dosage, benzodiazepine codispensing, and oxycodone or hydrocodone use. RESULTS: Weighted HR of opioid overdose relative to cyclobenzaprine was 2.52 (95% CI 1.29-4.90) for baclofen; 1.64 (95% CI 0.81-3.34) for carisoprodol; 1.14 (95% CI 0.53-2.46) for chlorzoxazone/orphenadrine; 0.46 (95% CI 0.17-1.24) for metaxalone; 1.00 (95% CI 0.45-2.20) for methocarbamol; and 1.07 (95% CI 0.49-2.33) for tizanidine in the 30-day intention-to-treat analysis. Findings were similar in the as-treated analysis, 2-group and 5-group comparisons, and patients without previous recorded substance abuse. None of the therapies relative to cyclobenzaprine were associated with sepsis, and no subgroups indicated an increased risk of opioid overdose. DISCUSSION: Concomitant use of prescription opioids and baclofen relative to cyclobenzaprine is associated with opioid overdose. Clinical interventions may focus on prescribing alternatives in the same drug class or providing access to opioid antagonists if treatment with both medications is necessary for pain management.

Rapid Extraction and Qualitative Screening of 30 Drugs in Oral Fluid at Concentrations Recommended for the Investigation of DUID Cases.

A rapid, simple extraction method followed by qualitative screening using liquid chromatography-tandem mass spectrometry (LC-MS-MS) for drugs in oral fluid is presented. The decision points were selected to be at, or lower, than those recommended as Tier I compounds by the National Safety Council's Alcohol, Drugs and Impairment Division for toxicological investigation of driving under the influence of drug (DUID) cases and were also at, or lower, than those recommended by Substance Abuse and Mental Health Service Administration and the Department of Transportation for Federal workplace drug testing programs. The method included 30 drugs: delta-9-tetrahydrocannabinol, amphetamine, methamphetamine, 3,4-methylenedioxymethamphetamine, 3,4-methylenedioxyamphetamine, cocaine, benzoylecgonine, carisoprodol, meprobamate, zolpidem, alprazolam, clonazepam, 7-aminoclonazepam, diazepam, nordiazepam, lorazepam, oxazepam, temazepam, codeine, morphine, 6-acetylmorphine, buprenorphine, fentanyl, hydrocodone, hydromorphone, oxycodone, oxymorphone, methadone, tramadol and phencyclidine. Phencyclidine was included because it is in the Federal workplace program even though it is considered a Tier II drug for DUID cases. A liquid-liquid extraction method using isopropanol, hexane and ethyl acetate to extract drugs from the oral fluid-buffer mix collected in a Quantisal™ device, followed by LC-MS-MS screening, was developed and validated according to ANSI/ASB 2019 Standard Practices for Method Validation in Forensic Toxicology. Interference studies, limit of detection, precision at the decision point, ionization suppression/enhancement and processed sample stability were determined for each drug. The method was successfully applied to proficiency specimens and routine samples received in the laboratory.

Examination of multiple drug arrests reported to the Maine Diversion Alert Program.

PURPOSE: Much of the responsibility for the increasing drug overdoses in the US has been attributed to opioids but most opioid overdoses also involve another drug. The objective of this study was to identify the drugs involved in polysubstance arrests. The substances that were more likely to be found in conjunction with other substances, using the drug arrests reported to Maine's Diversion Alert Program (DAP) were examined. METHODS: Single and multiple drug arrests were quantified (N = 9,216). Multiple drug arrest percentages were compared to single drug arrest percentages to create a Multiple-to-Single Ratio (MSR) specific to each drug family and each drug to identify over (MSR > 1) and under-representation (MSR < 1). RESULTS: Over three-fifths (63.8%) of all arrests involved a single drug. Opioids accounted for over-half (53.5%) of single arrests, followed by stimulants (27.7%) and hallucinogens (7.7%). Similarly, nearly two-fifths (39.6%) of multiple arrests were for opioids, followed by stimulants (30.8%) and miscellaneous (13.0%). Miscellaneous psychoactive prescription substances (e.g. clonidine, gabapentin, cyclobenzaprine, hydroxyzine) had the highest (1.51) MSR of any drug family. Conversely, stimulants (0.63), opioids (0.42), and hallucinogens (0.35) were significantly underrepresented in polysubstance arrests. Carisoprodol (8.80), amitriptyline (6.34), and quetiapine (4.69) had the highest MSR. Bath-salts (0.34), methamphetamine (0.44), and oxycodone (0.54) had the lowest MSR. CONCLUSION: The misuse of opioids, both alone and in conjunction with another drug, deserves continued surveillance. In addition, common prescription drugs with less appreciated misuse potential, especially carisoprodol, amitriptyline, and quetiapine, require greater attention for their ability to enhance the effects of other drugs.

A Review of Discovery Profiling of PIWI-Interacting RNAs and Their Diverse Functions in Metazoans.

PIWI-interacting RNAs (piRNAs) are a class of small non-coding RNAs (sncRNAs) that perform crucial biological functions in metazoans and defend against transposable elements (TEs) in germ lines. Recently, ubiquitously expressed piRNAs were discovered in soma and germ lines using small RNA sequencing (sRNA-seq) in humans and animals, providing new insights into the diverse functions of piRNAs. However, the role of piRNAs has not yet been fully elucidated, and sRNA-seq studies continue to reveal different piRNA activities in the genome. In this review, we summarize a set of simplified processes for piRNA analysis in order to provide a useful guide for researchers to perform piRNA research suitable for their study objectives. These processes can help expand the functional research on piRNAs from previously reported sRNA-seq results in metazoans. Ubiquitously expressed piRNAs have been discovered in the soma and germ lines in Annelida, Cnidaria, Echinodermata, Crustacea, Arthropoda, and Mollusca, but they are limited to germ lines in Chordata. The roles of piRNAs in TE silencing, gene expression regulation, epigenetic regulation, embryonic development, immune response, and associated diseases will continue to be discovered via sRNA-seq.

Mapping complex cell morphology in the grey matter with double diffusion encoding MR: A simulation study.

This paper investigates the impact of cell body (namely soma) size and branching of cellular projections on diffusion MR imaging (dMRI) and spectroscopy (dMRS) signals for both standard single diffusion encoding (SDE) and more advanced double diffusion encoding (DDE) measurements using numerical simulations. The aim is to investigate the ability of dMRI/dMRS to characterize the complex morphology of brain cells focusing on these two distinctive features of brain grey matter. To this end, we employ a recently developed computational framework to create three dimensional meshes of neuron-like structures for Monte Carlo simulations, using diffusion coefficients typical of water and brain metabolites. Modelling the cellular structure as realistically connected spherical soma and cylindrical cellular projections, we cover a wide range of combinations of sphere radii and branching order of cellular projections, characteristic of various grey matter cells. We assess the impact of spherical soma size and branching order on the b-value dependence of the SDE signal as well as the time dependence of the mean diffusivity (MD) and mean kurtosis (MK). Moreover, we also assess the impact of spherical soma size and branching order on the angular modulation of DDE signal at different mixing times, together with the mixing time dependence of the apparent microscopic anisotropy (µA), a promising contrast derived from DDE measurements. The SDE results show that spherical soma size has a measurable impact on both the b-value dependence of the SDE signal and the MD and MK diffusion time dependence for both water and metabolites. On the other hand, we show that branching order has little impact on either, especially for water. In contrast, the DDE results show that spherical soma size has a measurable impact on the DDE signal's angular modulation at short mixing times and the branching order of cellular projections significantly impacts the mixing time dependence of the DDE signal's angular modulation as well as of the derived µA, for both water and metabolites. Our results confirm that SDE based techniques may be sensitive to spherical soma size, and most importantly, show for the first time that DDE measurements may be more sensitive to the dendritic tree complexity (as parametrized by the branching order of cellular projections), paving the way for new ways of characterizing grey matter morphology, non-invasively using dMRS and potentially dMRI.

Toxicity of Somadril Compound on Fetal Ileum Tissues of Albino Rats.

BACKGROUND AND OBJECTIVE: Carisoprodol is a relaxant muscular-skeleton associated with sore muscles and appropriate studies have not been performed on carisoprodol effects on fetuses and mothers. This study has been conducted to clarify the treatment with a high and low dosage of carisoprodol (Somadril) on the histopathological, histochemical changes in the fetal ileum of the Albino rats. MATERIALS AND METHODS: In the present research 30 adult pregnant rats have been used and divided into three classes (10 pregnant rats in each group), the first group was the group of Control (C). The 2nd and 3rd groups (S1 and S2) were treated with carisoprodol oral doses equating to 10.8 and 21.6 mg/100 g b.wt. per day, respectively. For 15 days from day 6-20 of pregnancy, groups S1 and S2 are administered. On the 20th day of pregnancy, the pregnant rats were sacrificed and small parts of fetal ileum for histopathological and histochemical studies. RESULTS: Diverse histopathological and histochemical alternations were detected in the fetal ileum tissue of the two groups S1 and S2 after maternal treatment with high and low doses of carisoprodol compared to the control set. CONCLUSION: This study showed that several histopathological and histochemical deformities in the fetal ileum tissues were caused by the administration of carisoprodol.

Dual RNAseq analyses at soma and germline levels reveal evolutionary innovations in the elephantiasis-agent Brugia malayi, and adaptation of its Wolbachia endosymbionts.

Brugia malayi is a human filarial nematode responsible for elephantiasis, a debilitating condition that is part of a broader spectrum of diseases called filariasis, including lymphatic filariasis and river blindness. Almost all filarial nematode species infecting humans live in mutualism with Wolbachia endosymbionts, present in somatic hypodermal tissues but also in the female germline which ensures their vertical transmission to the nematode progeny. These α-proteobacteria potentially provision their host with essential metabolites and protect the parasite against the vertebrate immune response. In the absence of Wolbachia wBm, B. malayi females become sterile, and the filarial nematode lifespan is greatly reduced. In order to better comprehend this symbiosis, we investigated the adaptation of wBm to the host nematode soma and germline, and we characterized these cellular environments to highlight their specificities. Dual RNAseq experiments were performed at the tissue-specific and ovarian developmental stage levels, reaching the resolution of the germline mitotic proliferation and meiotic differentiation stages. We found that most wBm genes, including putative effectors, are not differentially regulated between infected tissues. However, two wBm genes involved in stress responses are upregulated in the hypodermal chords compared to the germline, indicating that this somatic tissue represents a harsh environment to which wBm have adapted. A comparison of the B. malayi and C. elegans germline transcriptomes reveals a poor conservation of genes involved in the production of oocytes, with the filarial germline proliferative zone relying on a majority of genes absent from C. elegans. The first orthology map of the B. malayi genome presented here, together with tissue-specific expression enrichment analyses, indicate that the early steps of oogenesis are a developmental process involving genes specific to filarial nematodes, that likely result from evolutionary innovations supporting the filarial parasitic lifestyle.

Caenorhabditis elegans establishes germline versus soma by balancing inherited histone methylation.

Formation of a zygote is coupled with extensive epigenetic reprogramming to enable appropriate inheritance of histone methylation and prevent developmental delays. In Caenorhabditis elegans, this reprogramming is mediated by the H3K4me2 demethylase SPR-5 and the H3K9 methyltransferase, MET-2. In contrast, the H3K36 methyltransferase MES-4 maintains H3K36me2/3 at germline genes between generations to facilitate re-establishment of the germline. To determine whether the MES-4 germline inheritance pathway antagonizes spr-5; met-2 reprogramming, we examined the interaction between these two pathways. We found that the developmental delay of spr-5; met-2 mutant progeny is associated with ectopic H3K36me3 and the ectopic expression of MES-4-targeted germline genes in somatic tissues. Furthermore, the developmental delay is dependent upon MES-4 and the H3K4 methyltransferase, SET-2. We propose that MES-4 prevents crucial germline genes from being repressed by antagonizing maternal spr-5; met-2 reprogramming. Thus, the balance of inherited histone modifications is necessary to distinguish germline versus soma and prevent developmental delay.This article has an associated 'The people behind the papers' interview.

Carisoprodol pharmacokinetics and distribution in the nucleus accumbens correlates with behavioral effects in rats independent from its metabolism to meprobamate.

Carisoprodol (Soma®) is a centrally-acting skeletal-muscle relaxant frequently prescribed for treatment of acute musculoskeletal conditions. Carisoprodol's mechanism of action is unclear and is often ascribed to that of its active metabolite, meprobamate. The purpose of this study was to ascertain whether carisoprodol directly produces behavioral effects, or whether metabolism to meprobamate via cytochrome P450 (CYP450) enzymatic reaction is necessary. Rats were trained to discriminate carisoprodol (100 mg/kg) to assess time course and whether a CYP450 inhibitor (cimetidine) administered for 4 days would alter the discriminative effects of carisoprodol. Additionally, pharmacokinetics of carisoprodol and meprobamate with and without co-administration of cimetidine were assessed via in vivo microdialysis combined with liquid-chromatography-tandem mass spectrometry from blood and nucleus accumbens (NAc). The time course of the discriminative-stimulus effects of carisoprodol closely matched the time course of the levels of carisoprodol in blood and NAc, but did not match the time course of meprobamate. Administration of cimetidine increased levels of carisoprodol and decreased levels of meprobamate consistent with its interfering with metabolism of carisoprodol to meprobamate. However, cimetidine failed to alter the discriminative-stimulus effects of carisoprodol. Carisoprodol penetrated into brain tissue and directly produced behavioral effects without being metabolized to meprobamate. These findings indicate that understanding the mechanism of action of carisoprodol independently of meprobamate will be necessary to determine the validity of its clinical uses.

Overlooked Scents: Chemical Profile of Soma, Volatile Emissions and Trails of the Green Tree Ant, Oecophylla smaragdina.

The green tree ant, Oecophylla smaragdina, is one of only two recognized species of weaver ants. While the identity and functions of chemicals produced and emitted by its congener O. longinoda have been studied quite extensively and serve as a valuable model in chemical ecology research, little comparable information is available about O. smaragdina. Although some analyses of chemicals produced and emitted by O. smaragdina have been reported, the literature is fragmentary and incomplete for this species. To address this knowledge gap, and to enable comparisons in the chemical ecology of the two weaver ant species, we here describe diverse chemicals from the cuticle, Dufour's glands, poison glands, head, headspace volatiles, and trails of O. smaragdina.

Chromatin Immunoprecipitation from Caenorhabditis elegans Somatic Cells.

Chromatin Immunoprecipitation is a regularly used method to detect DNA-protein interaction in diverse biological samples. Here we describe the application of ChIP for histone modifications in adult-stage Caenorhabditis elegans somatic cells.

Risk of Opioid Overdose Associated With Concomitant Use of Opioids and Skeletal Muscle Relaxants: A Population-Based Cohort Study.

The recent opioid prescribing guideline cautions about the concomitant prescribing of opioids and skeletal muscle relaxants (SMRs) given the additive central nervous system depressant effect. However, the clinical relevance remains unclear. In this retrospective cohort study, we compared the risk of opioid overdose associated with concomitant use of opioids and SMRs vs. opioid use alone. Adjusted hazard ratios were 1.09 (95% confidence interval (CI), 0.74-1.62) and 1.26 (95% CI, 1.00-1.58) in the incident and prevalent opioid user cohorts, respectively, generating a combined estimate of 1.21 (95% CI, 1.00-1.48). This risk seemed to increase with treatment duration (≤ 14 days: 0.91 and 95% CI, 0.67-1.22; 15-60 days: 1.37 and 95% CI, 0.81-2.37; >60 days: 1.80 and 95% CI, 1.30-2.48) and for baclofen (1.83 and 95% CI, 1.11-3.04) and carisoprodol (1.84 and 95% CI, 1.34-2.54). Concomitant users with daily opioid dose ≥50 mg (1.50 and 95% CI, 1.18-1.92) and benzodiazepine use (1.39 and 95% CI, 1.08-1.79) also had elevated risk. Clinicians should be cautious about these potentially unsafe practices to optimize pain care and improve patient safety.

Robust perisomatic GABAergic self-innervation inhibits basket cells in the human and mouse supragranular neocortex.

Inhibitory autapses are self-innervating synaptic connections in GABAergic interneurons in the brain. Autapses in neocortical layers have not been systematically investigated, and their function in different mammalian species and specific interneuron types is poorly known. We investigated GABAergic parvalbumin-expressing basket cells (pvBCs) in layer 2/3 (L2/3) in human neocortical tissue resected in deep-brain surgery, and in mice as control. Most pvBCs showed robust GABAAR-mediated self-innervation in both species, but autapses were rare in nonfast-spiking GABAergic interneurons. Light- and electron microscopy analyses revealed pvBC axons innervating their own soma and proximal dendrites. GABAergic self-inhibition conductance was similar in human and mouse pvBCs and comparable to that of synapses from pvBCs to other L2/3 neurons. Autaptic conductance prolonged somatic inhibition in pvBCs after a spike and inhibited repetitive firing. Perisomatic autaptic inhibition is common in both human and mouse pvBCs of supragranular neocortex, where they efficiently control discharge of the pvBCs.

Gaps and barriers: Gap junctions as a channel of communication between the soma and the germline.

Gap junctions, expressed in most tissues of the body, allow for the cytoplasmic coupling of adjacent cells and promote tissue cooperation. Gap junctions connect also the soma and the germline in many animals, and transmit somatic signals that are crucial for germline maturation and integrity. In this review, we examine the involvement of gap junctions in the relay of information between the soma and the germline, and ask whether such communication could have consequences for the progeny. While the influence of parental experiences on descendants is of great interest, the possibility that gap junctions participate in the transmission of information across generations is largely unexplored.

Overlapping prescriptions of opioids, benzodiazepines, and carisoprodol: "Holy Trinity" prescribing in the state of Florida.

BACKGROUND: High-risk combinations of controlled medications, such as those involving opioid analgesics, are under increased scrutiny because of their contribution to the opioid epidemic in the United States. Responsible prescribing guidelines indicate that the triple drug combination--opioids, benzodiazepines and skeletal muscle relaxants, especially carisoprodol--should not be concurrently prescribed. METHODS: This pharmacoepidemiologic study was designed to primarily examine the characteristics of patients receiving this triple combination compared to the group receiving only opioids and benzodiazepines. RESULTS: Results show that, while the number of exposed patients has declined since 2012, approximately 17,000 Floridians were prescribed this combination in 2017 alone. Demographically, recipients of these prescriptions were younger, more likely to be female, and geographically-localized. Furthermore, these patients were more frequently associated with a prescriber in the top 1% of opioid and/or benzodiazepine prescribing, have more multiple provider episodes ("doctor shopping"), and receive higher mean daily opioid dosages. CONCLUSIONS: These findings raise important questions as to how frequently prescribers are checking prescription drug monitoring programs, following US Centers for Disease Control and Prevention opioid prescribing guidelines, and/or handling the clinical challenges associated with pharmaceutical management of patients with complex, painful health conditions.

Impact of Schedule IV controlled substance classification on carisoprodol utilization in the United States: An interrupted time series analysis.

BACKGROUND: In January 2012, the Drug Enforcement Agency (DEA) classified carisoprodol as a Schedule IV controlled substance at the US federal level. We aimed to examine the effect of this policy on the use of carisoprodol in a commercially-insured population. METHODS: This interrupted time series study included individuals with musculoskeletal disorders in the IBM MarketScan Commercial Database between December 2009 and February 2014. We used comparative segmented linear regression to assess changes in the proportions of patients who filled/newly filled carisoprodol each month. RESULTS: A total of 13.3 million patients were included. 29 states with no scheduling prior to the DEA classification had lower baseline prevalence of carisoprodol use compared to 17 states that had scheduled carisoprodol individually before 2010 (11.0 vs. 21.1 patients with fills per 1000 patients). The federal scheduling was associated with an immediate decline (-1.12 per 1000 patients, p < 0.01) and decreasing trend in prevalence (-0.07 per 1000 patients per month, p = 0.02). This effect was not modified by existing state-level scheduling status. During the first, second, third, and fourth 6-month periods after federal scheduling, the relative difference between observed and predicted prevalence was 7.8%, 10.5%, 13.4%, and 19.8%. Similar patterns were observed for carisoprodol initiation. Overall, declining use was more pronounced among younger age groups and patients with injury. CONCLUSIONS: Schedule IV controlled substance classification at the federal level was associated with a moderate reduction in the dispensing of carisoprodol regardless of whether scheduling was already present at the state level.

Imaging and analysis of genetically encoded calcium indicators linking neural circuits and behaviors

Confirming the direct link between neural circuit activity and animal behavior has been a principal aim of neuroscience. The genetically encoded calcium indicator (GECI), which binds to calcium ions and emits fluorescence visualizing intracellular calcium concentration, enables detection of in vivo neuronal firing activity. Various GECIs have been developed and can be chosen for diverse purposes. These GECI-based signals can be acquired by several tools including two-photon microscopy and microendoscopy for precise or wide imaging at cellular to synaptic levels. In addition, the images from GECI signals can be analyzed with open source codes including constrained non-negative matrix factorization for endoscopy data (CNMF_E) and miniscope 1-photon-based calcium imaging signal extraction pipeline (MIN1PIPE), and considering parameters of the imaged brain regions (e.g., diameter or shape of soma or the resolution of recorded images), the real-time activity of each cell can be acquired and linked with animal behaviors. As a result, GECI signal analysis can be a powerful tool for revealing the functions of neuronal circuits related to specific behaviors.

The First Generation of iPSC Line from a Korean Alzheimer's Disease Patient Carrying APP-V715M Mutation Exhibits a Distinct Mitochondrial Dysfunction

Alzheimer's Disease (AD) is a progressive neurodegenerative disease, which is pathologically defined by the accumulation of amyloid plaques and hyper-phosphorylated tau aggregates in the brain. Mitochondrial dysfunction is also a prominent feature in AD, and the extracellular Aβ and phosphorylated tau result in the impaired mitochondrial dynamics. In this study, we generated an induced pluripotent stem cell (iPSC) line from an AD patient with amyloid precursor protein (APP) mutation (Val715Met; APP-V715M) for the first time. We demonstrated that both extracellular and intracellular levels of Aβ were dramatically increased in the APP-V715M iPSC-derived neurons. Furthermore, the APP-V715M iPSC-derived neurons exhibited high expression levels of phosphorylated tau (AT8), which was also detected in the soma and neurites by immunocytochemistry. We next investigated mitochondrial dynamics in the iPSC-derived neurons using Mito-tracker, which showed a significant decrease of anterograde and retrograde velocity in the APP-V715M iPSC-derived neurons. We also found that as the Aβ and tau pathology accumulates, fusion-related protein Mfn1 was decreased, whereas fission-related protein DRP1 was increased in the APP-V715M iPSC-derived neurons, compared with the control group. Taken together, we established the first iPSC line derived from an AD patient carrying APP-V715M mutation and showed that this iPSC-derived neurons exhibited typical AD pathological features, including a distinct mitochondrial dysfunction.