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Stem Cell-Derived Interneuron Transplants As a Treatment for Schizophrenia: Preclinical Validation in a Rodent Model

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Stem Cell-Derived Interneuron Transplants As a Treatment for Schizophrenia: Preclinical Validation in a Rodent Model Molecular Psychiatry (2016) 00, 1–10 © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved 1359-4184/16 www.nature.com/mp ORIGINAL ARTICLE Stem cell-derived interneuron transplants as a treatment for schizophrenia: preclinical validation in a rodent model JJ Donegan1, JA Tyson2, SY Branch3, MJ Beckstead3, SA Anderson2 and DJ Lodge1 An increasing literature suggests that schizophrenia is associated with a reduction in hippocampal interneuron function. Thus, we posit that stem cell-derived interneuron transplants may be an effective therapeutic strategy to reduce hippocampal hyperactivity and attenuate behavioral deficits in schizophrenia. Here we used a dual-reporter embryonic stem cell line to generate enriched populations of parvalbumin (PV)- or somatostatin (SST)-positive interneurons, which were transplanted into the ventral hippocampus of the methylazoxymethanol rodent model of schizophrenia. These interneuron transplants integrate within the existing circuitry, reduce hippocampal hyperactivity and normalize aberrant dopamine neuron activity. Further, interneuron transplants alleviate behaviors that model negative and cognitive symptoms, including deficits in social interaction and cognitive inflexibility. Interestingly, PV- and SST-enriched transplants produced differential effects on behavior, with PV-enriched populations effectively normalizing all the behaviors examined. These data suggest that the stem cell-derived interneuron transplants may represent a novel therapeutic strategy for schizophrenia. Molecular Psychiatry advance online publication, 2 August 2016; doi:10.1038/mp.2016.121 INTRODUCTION dopamine system function but also for the negative and cognitive 8,9 Schizophrenia is a devastating psychiatric disorder characterized symptoms that rely on prefrontal cortical function. Hippocampal by positive, negative and cognitive symptoms. One of the longest- pathology is routinely observed in schizophrenia patients with an increased activity at rest10 being correlated with both psychosis11 standing hypotheses of schizophrenia posits that excessive 12 subcortical dopamine release is responsible for the positive and cognitive dysfunction. This hyperactivity has been attri- fi 13 symptoms of the disorder. Support for this hypothesis stems buted to a de cit of inhibitory interneuron function. Indeed, 1 some schizophrenia patients display reductions in hippocampal from the fact that all antipsychotics are D2 receptor antagonists 2+ and can reduce positive symptoms.2 Unfortunately, these drugs interneurons that express the Ca -binding protein, parvalbumin (PV) and those that express the neuromodulator, somatostatin are not effective in all patients, possess debilitating side effects, 14,15 and have little to no impact on the negative or cognitive symptom (SST). Recently, we demonstrated that a loss of PV expression is sufficient, in and of itself, to increase the vHipp activity and domains.2 Currently, there are no Food and Drug Administration- produce downstream alterations in dopamine system function approved medications that specifically target the negative and and schizophrenia-like changes in behavior.16 Therefore, we cognitive symptoms of schizophrenia, which are associated with a 3 hypothesize that a loss of the interneuron function leads to an markedly reduced quality of life. Negative symptoms, such as increase in the hippocampal activity and aberrant dopamine blunted affect and social avoidance, and cognitive symp- system function. Restoring inhibitory interneuron function in the toms, such as deficits in attention and executive function, can 3,4 vHipp may normalize both hippocampal and dopamine neuron be severely debilitating. Even among schizophrenia patients activity, resulting in a resolution of the positive, negative and that respond to antipsychotic medications, disability rates remain cognitive symptoms of schizophrenia. high and functional outcomes poor, highlighting the urgent need We have recently tested this hypothesis using interneuron to treat these residual negative and cognitive symptoms of transplants derived from rat fetal tissue.17 During development, 3 schizophrenia. Thus, new approaches targeting all three symp- the majority of PV- and SST-positive interneurons are derived tom domains are urgently needed. from the telencephalic structure known as the medial ganglionic Although the dopamine hypothesis has received wide support, eminence (MGE).18 Interneuron precursors born in the MGE there has been little observable primary pathology identified in have the remarkable ability to migrate tangentially across the dopamine system of schizophrenia patients. This has led to cortical regions.19 Therefore, we used fetal MGE tissue to restore the suggestion that the pathology may lie upstream in brain interneuron function in the methylazoxymethanol (MAM) devel- regions that regulate the dopamine system, such as the ventral opmental model of schizophrenia.17 We found that interneuron hippocampus (vHipp).5 The vHipp not only regulates the activity transplants into the vHipp reduced the hippocampal hyperactivity of the dopamine system6 but also projects directly to the and dopamine population activity, and normalized amphetamine- prefrontal cortex,7 making this a reasonable therapeutic target induced locomotor activity, a model for the positive symptoms of not only for the positive symptoms associated with increased schizophrenia. A subsequent paper showed similar effects of 1Department of Pharmacology and Center for Biomedical Neuroscience, University of Texas Health Science Center, San Antonio, TX, USA; 2Department of Psychiatry, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, PA, USA and 3Department of Physiology and Center for Biomedical Neuroscience, University of Texas Health Science Center, San Antonio, TX, USA. Correspondence: Dr JJ Donegan, Department of Pharmacology and Center for Biomedical Neuroscience, University of Texas Health Science Center, Mail Code 7764, 7703 Floyd Curl Drive, San Antonio 78229, TX, USA. E-mail: [email protected] Received 15 September 2015; revised 17 June 2016; accepted 21 June 2016 Using stem cells to treat schizophrenia JJ Donegan et al 2 interneuron transplants on the hippocampal hyperactivity and centrifuged (250 g) and the pellet was resuspended in Dulbecco’s Modified psychosis-related behaviors in a transgenic mouse model with Eagle Medium:F12 with 20% fetal bovine serum and 10 μM Y-27632. Cells reduced PV-positive interneurons in the hippocampus.20 Although were incubated with Zombie Violet (Biolegend, San Diego, CA, USA) for these results are exciting, this approach is not feasible in patients 15 min at room temperature. After centrifugation, the pellet was ’ fi because of the source of the interneurons (fetal brain). Further, resuspended in Dulbecco s Modi ed Eagle Medium:F12 containing fetal bovine serum and Y-27632, passed through a 70 μm filter and stored on these studies did not examine negative and cognitive symptoms of ice until sorting began. Cells were sorted using a BD FACSAria III (Franklin schizophrenia, which are poorly treated by antipsychotics, and did Lakes, NJ, USA; 70 μm nozzle, 50 psi) and analyzed using FACS Diva 6.1.3 not differentiate between interneuron subclasses. This is important software (BD; Supplementary Figure 1). After excluding dead cells and as the distinct axon targeting and firing properties of interneuron doublets, mCherry-positive or GFP-positive cells were collected in subclasses is likely to differentially affect the local activity after neurobasal medium containing B27, 2 mML-glutamine and 10 μM Y-27632. transplantation.13 Moreover, different interneuron subtypes display discrete neurophysiological characteristics that may alter their 13 Cell transplants therapeutic utility. Thus, to address these issues in the current On PNDs 40–45, animals were anesthetized (sodium pentobarbital, studies, we used embryonic stem cells that were differentiated into − 1 21 60 mg kg , i.p.) and placed in a stereotaxic apparatus. Bilateral cannula enriched populations of distinct interneuron subgroups. Here we aimed at the vHipp (A/P +4.8, M/L ± 4.8, D/V − 7.0 mm from bregma) were explore the role of specific interneuron subclasses in treating used to inject ~ 40 000 cells into each hemisphere. Control animals received neurophysiological and behavioral alterations in the MAM model of dead cell transplants, produced by repeated freezing and thawing, and schizophrenia, and expand our recent findings to determine if confirmed by trypan blue. Rats were treated with an immunosuppressant − vHipp interneuron transplants can also alleviate correlates of the (cyclosporin A, 10 mg kg 1, subcutaneously) for 7 days to prevent rejection negative and cognitive symptoms associated with this disorder. of mouse embryonic stem cells. After day 7, cyclosporin A was administered in the drinking water (100 μgml− 1) for the duration of the experiment. All electrophysiological and behavioral experiments were performed at least MATERIALS AND METHODS 30 days post transplantation, a time point at which the cells have had sufficient time to migrate and integrate into the cortex.21 Drugs and reagents 6,7-dinitroquinoxaline-2,3-dione, picrotoxin, MK-801, kynurenic acid, gua- nosine 5′ triphosphate sodium salt hydrate (GTP), adenosine 5′ tripho- Ex vivo electrophysiology sphate magnesium salt (ATP), ethylene glycol-bis(β-aminoethyl ether)-N,N, To confirm that the transplanted cells integrated into the existing
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