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Samara B Ginzburg, Susan Deutsch, Jaclyn Bellissimo, David E Elkowitz, Joel NH Stern, Robert Lucito Department of Science Education, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA Purpose: The evolution of health care systems in response to societal and financial pressures has changed care delivery models, which presents new challenges for physicians. Leadership training is increasingly being recognized as an essential component of medical education training to prepare physicians to meet these needs. Unfortunately, most medical schools do not include leadership training. It has been suggested that a longitudinal and integrated approach to leadership training should be sought. We hypothesized that integration of leadership training into our hybrid problem-based learning (PBL)/case-based learning (CBL) program, Patient-Centered Explorations in Active Reasoning, Learning and Synthesis (PEARLS), would be an effective way for medical students to develop leadership skills without the addition of curricular time. Methods: We designed a unique leadership program in PEARLS in which 98 medical students participated during each of their six courses throughout the first 2 years of school. A program director and trained faculty facilitators educated students and coached them on leadership development throughout this time. Students were assessed by their facilitator at the end of every course on development of leadership skills related to teamwork, meaningful self-assessment, process improvement, and thinking outside the box. Results: Students consistently improved their performance from the first to the final course in all four leadership parameters evaluated. The skills that demonstrated the greatest change were those pertaining to thinking outside the box and process improvement. Conclusion: Incorporation of a longitudinal and integrated approach to leadership training into an existing PBL/CBL program is an effective way for medical students to improve their leadership skills without the addition of curricular time. These results offer a new, time-efficient option for leadership development in schools with existing PBL/CBL programs. Keywords: student-centered, learner-centered, self-directed learning, curricular innovation, higher-order thinking

Chronic visceral pain disorders, such as interstitial cystitis/bladder pain syndrome (IC/BPS), are difficult to treat, and therapies are limited in number and efficacy. Emerging evidence suggests that alterations in the enzyme purine nucleoside phosphorylase (PNPase) may participate in oxidative injury and cellular damage. PNPase is important for the metabolism of 'tissue-protective' purine metabolites to 'tissue-damaging' purines that generate free radicals. The aim of this study is to test whether patients living with IC/BPS without or with Hunner lesions and irrespective of any therapies exhibit purine dysregulation with higher levels of tissue-damaging purine metabolites as measured by liquid chromatography-tandem mass spectrometry. Our results demonstrate that levels of urotoxic purine metabolites (hypoxanthine and xanthine) in IC/BPS patients with and without Hunner lesions are elevated compared to healthy controls. These findings suggest there may be pathophysiologic commonalities between patient subtypes. Furthermore, the accumulation of uroprotective purines and depletion of urodamaging purines by PNPase inhibition may be therapeutically effective in both groups of patients., (© 2024. The Author(s).)

Neuromyelitis optica spectrum disorders (NMOSD) are rare, debilitating autoimmune diseases of the central nervous system. Many NMOSD patients have antibodies to Aquaporin-4 (AQP4). Prior studies show associations of NMOSD with individual Human Leukocyte Antigen (HLA) alleles and with mutations in the complement pathway and potassium channels. HLA allele associations with NMOSD are inconsistent between populations, suggesting complex relationships between the identified alleles and risk of disease. We used a retrospective case-control approach to identify contributing genetic variants in patients who met the diagnostic criteria for NMOSD and their unaffected family members. Potentially deleterious variants identified in NMOSD patients were compared to members of their families who do not have the disease and to existing databases of human genetic variation. HLA sequences from patients from Belgrade, Serbia, were compared to the frequency of HLA haplotypes in the general population in Belgrade. We analyzed exome sequencing on 40 NMOSD patients and identified rare inherited variants in the complement pathway and potassium channel genes. Haplotype analysis further detected two haplotypes, HLA-A*01, B*08, DRB1*03 and HLA-A*01, B*08, C*07, DRB1*03, DQB1*02, which were more prevalent in NMOSD patients than in unaffected individuals. In silico modeling indicates that HLA molecules within these haplotypes are predicted to bind AQP4 at several sites, potentially contributing to the development of autoimmunity. Our results point to possible autoimmune and neurodegenerative mechanisms that cause NMOSD, and can be used to investigate potential NMOSD drug targets., Competing Interests: The members of the Regeneron Genetics Center and AK were employed by Regeneron. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Tabansky, Tanaka, Wang, Zhang, Dujmovic, Mader, Jeganathan, DeAngelis, Funaro, Harel, Messina, Shabbir, Nursey, DeGouvia, Laurent, Blitz, Jindra, Gudesblatt, Regeneron Genetics Center, King, Drulovic, Yunis, Brusic, Shen, Keskin, Najjar and Stern.)

Interstitial cystitis/bladder pain syndrome (IC/BPS) is a disorder characterized by bladder pain upon filling which severely affects quality of life. Clinical presentation can vary. Local inflammatory events typify the clinical presentation of IC/BPS patients with Hunner lesions (IC/BPS-HL). It has previously been proposed that B cells are more prevalent in HL, but understanding their exact role in this environment requires a more complete immunological profile of HL. We characterized immunological dysfunction specifically in HL using immunohistochemistry. We detected significantly more plasma cells (50× increase, p < 0.0001), B cells (28× increase, p < 0.0001), T cells (3× increase, p < 0.0001), monocytes/macrophages (6× increase, p < 0.0001), granulocytes (4× increase, p < 0.0001), and natural killer cells (2× increase, p = 0.0249) in IC/BPS patients with HL than in unaffected controls (UC). Patients with IC/BPS-HL also had significantly elevated urinary levels of IL-6 (p = 0.0054), TNF-α (p = 0.0064) and IL-13 (p = 0.0304) compared to patients with IC/BPS without HL (IC/BPS-NHL). In contrast, IL-12p70 levels were significantly lower in the patients with HL than in those without these lesions (p = 0.0422). Different cytokines were elevated in the urine of IC/BPS patients with and without HL, indicating that different disease processes are active in IC/BPS patients with and without HL. Elevated levels of CD138+, CD20+, and CD3+ cells in HL are consistent B and T-cell involvement in disease processes within HL., (© 2022. The Author(s).)

Background: Immune function and dysfunction are highly complex basic science concepts introduced in the preclinical medical school curriculum. A challenge for early learners is connecting the intricate details and concepts in immunology with clinical manifestations. This impedes relevance and applicability. The impetus in medical education reform is promoting consolidation of basic science and clinical medicine during the first two years of medical school. Simulation is an innovation now widely employed in medical schools to enhance clinical learning. Its use in basic science curriculums is largely deficient. The authors piloted simulation as a novel curricular approach to enhance fundamental immunology knowledge and clinical integration., Methods: The authors introduced a Primary Immunodeficiency Disease (PIDD) simulation during a basic science immunology course for second-year medical students at the Zucker School of Medicine at Hofstra/Northwell. The simulation tasked small groups of students with evaluating, diagnosing and managing an infant with previously undiagnosed immunodeficiency. Joint facilitation by clinical and science faculty during terminal debriefings engaged students in Socratic discussion. Debriefing aimed to immerse basic science content in the context of the clinical case. Students completed a post-simulation Likert survey, assessing utility in reinforcing clinical reasoning, integration of basic science and clinical immunology, enhanced knowledge and understanding of immunodeficiency, and enhanced learning. A summative Immunodeficiency Objective Structured Clinical Examination (OSCE) question was created by faculty to assess students' recognition of a PIDD and clinical reasoning., Results: The simulation was well received by students with > 90% endorsing each of the objectives on the post-simulation survey. The authors also determined a statistically significant score variance on the summative OSCE question. Higher scores were achieved by the cohort of students completing the OSCE post-simulation versus the cohort completing the OSCE pre-simulation., Conclusions: The innovative use of simulation in a highly complex basic science immunology course provides relevance and consolidation for preclinical learners. Additional data will be collected to continuously assess application of concepts and proficiency stemming from this novel curricular intervention. The authors advocate the initiation and/or expansion of simulation in non-clinical basic science courses such as immunology to bridge the gap between theory and practice.

Neurons of the medullary reticular nucleus gigantocellularis (NGC) and their targets have recently been a focus of research on mechanisms supporting generalized CNS arousal (GA) required for proper cognitive functions. Using the retro-TRAP method, we characterized transcripts enriched in NGC neurons which have projections to the thalamus. The unique expression and activation of the endothelial nitric oxide (eNOS) signaling pathway in these cells and their intimate connections with blood vessels indicate that these neurons exert direct neurovascular coupling. Production of nitric oxide (NO) within eNOS-positive NGC neurons increases after environmental perturbations, indicating a role for eNOS/NO in modulating environmentally appropriate levels of GA. Inhibition of NO production causes dysregulated behavioral arousal after exposure to environmental perturbation. Further, our findings suggest interpretations for associations between psychiatric disorders and mutations in the eNOS locus., Competing Interests: The authors declare no conflict of interest.

Background: Dendritic cells (DC) induce adaptive responses against foreign antigens, and play an essential role in maintaining peripheral tolerance to self-antigens. Therefore they are involved in preventing fatal autoimmunity. Selective delivery of antigens to immature DC via the endocytic DEC-205 receptor on their surface promotes antigen-specific T cell tolerance, both by recessive and dominant mechanisms. We provide evidence that the induction of antigen-specific T cell tolerance is not a unique property of CD11c + CD8 + DEC-205 + DCs., Methods: We employed a fusion between αDCIR2 antibodies and the highly encephalitogenic peptide 139-151 of myelin-derived proteolipid protein (PLP 139-151 ), to target CD11c + CD8 - DCs with a DEC-205-DCIR2 + phenotype in vivo, and to substantially improve clinical symptoms in the PLP 139-151 -induced model of experimental autoimmune encephalomyelitis (EAE)., Results: Consistent with previous studies targeting other cell surface receptors, EAE protection mediated by αDCIR2-PLP 139-151 fusion antibody (Ab) depended on an immature state of targeted DCIR2 + DCs. The mechanism of αDCIR2-PLP 139-151 mAb function included the deletion of IL-17- and IFN-γ-producing pathogenic T cells, as well as the enhancement of regulatory T (Treg) cell activity. In contrast to the effect of αDEC-205 + fusion antibodies, which involves extrathymic induction of a Foxp3 + Treg cell phenotype in naïve CD4 + Foxp3 - T cells, treatment of animals with DCIR2 + fusion antibodies resulted in antigen-specific activation and proliferative expansion of natural Foxp3 + Treg cells., Conclusions: These results suggest that multiple mechanisms can lead to the expansion of the Treg population, depending on the DC subset and receptor targeted.

Objective: IgG anti-DWEYS antibodies cross-reactive with DNA and the N-methyl-d-aspartate receptor subunits GluN2A and GluN2B are known to be associated with neuropsychiatric systemic lupus erythematosus (NPSLE). IgG anti-DWEYS have not been investigated in demyelinating NPSLE or in another demyelinating disorder, neuromyelitis optica spectrum disorder (NMOSD), which is a disease also found mainly in young women and associated with aquaporin 4 (AQP-4) or myelin oligodendrocyte glycoprotein (MOG) antibodies. This study was undertaken to investigate the frequency of all of these brain-reactive antibodies in patients with NPSLE, those with demyelinating NPSLE, and those with NMOSD., Methods: Serum samples from patients with NPSLE (n = 108), patients with SLE without neuropsychiatric manifestations (n = 38), patients with NMOSD (n = 33), and healthy controls (n = 106) were assessed for the frequency of IgG anti-brain antibodies as well as IgG antibodies to AQP-4, MOG, GluN2A/GluN2B, and double-stranded DNA (dsDNA)., Results: Sera were positive for IgG anti-AQP-4 antibodies in 27 (82%) of 33 patients with NMOSD and 3 (27%) of 11 patients with demyelinating NPSLE, whereas all sera from patients with non-demyelinating NPSLE, patients with SLE, and healthy controls were negative for IgG anti-AQP-4. IgG anti-MOG were detected at high titers in 3 (50%) of 6 patients with NMOSD who were negative for IgG anti-AQP-4, and at low titers in 2 (18%) of 11 patients with demyelinating NPSLE and 1 (1%) of 97 patients with non-demyelinating NPSLE. IgG antibodies to dsDNA were present in 11 (33%) of 33 patients with NMOSD. Only 4 (12%) of 33 patients with NMOSD were positive for IgG anti-DWEYS, compared to 11 (29%) of 38 patients with SLE and 59 (55%) of 108 patients with NPSLE. IgG anti-DWEYS antibodies were present in 56 (58%) of 97 patients with non-demyelinating NPSLE and 3 (27%) of 11 patients with demyelinating NPSLE. Serum IgG brain-reactive antibodies were present at a similar frequency in patients with non-demyelinating NPSLE (72 [75%] of 96), those with demyelinating NPSLE (9 [82%] of 11), and those with SLE (32 [84%] of 38), but were less frequent in patients with NMOSD (20 [61%] of 33)., Conclusion: Patients with demyelinating NPSLE should be tested for IgG antibodies to AQP-4, MOG, and DWEYS. IgG anti-AQP-4 can be considered diagnostic for NMOSD, whereas none of these antibodies appear to be diagnostic for demyelinating NPSLE. Moreover, IgG anti-dsDNA are present in patients with NMOSD but are not cross-reactive with IgG anti-DWEYS, indicating that the antigenic stimulus and mechanisms of tissue damage are potentially different between demyelinating NPSLE and NMOSD., (© 2017, American College of Rheumatology.)

Schizophrenia is a psychotic disorder characterized by delusions, hallucinations, negative symptoms, as well as behavioral and cognitive dysfunction. It is a pathoetiologically heterogeneous disorder involving complex interrelated mechanisms that include oxidative stress and neuroinflammation. Neurovascular endothelial dysfunction and blood-brain barrier (BBB) hyperpermeability are established mechanisms in neurological disorders with comorbid psychiatric symptoms such as epilepsy, traumatic brain injury, and Alzheimer's disease. Schizophrenia is frequently comorbid with medical conditions associated with peripheral vascular endothelial dysfunction, such as metabolic syndrome, cardiovascular disease, and diabetes mellitus. However, the existence and etiological relevance of neurovascular endothelial dysfunction and BBB hyperpermeability in schizophrenia are still not well recognized. Here, we review the growing clinical and experimental evidence, indicating that neurovascular endotheliopathy and BBB hyperpermeability occur in schizophrenia patients. We present a theoretical integration of human and animal data linking oxidative stress and neuroinflammation to neurovascular endotheliopathy and BBB breakdown in schizophrenia. These abnormalities may contribute to the cognitive and behavioral symptoms of schizophrenia via several mechanisms involving reduced cerebral perfusion and impaired homeostatic processes of cerebral microenvironment. Furthermore, BBB disruption can facilitate interactions between brain innate and peripheral adaptive immunity, thereby perpetuating harmful neuroimmune signals and toxic neuroinflammatory responses, which can also contribute to the symptoms of schizophrenia. Taken together, these findings support the "mild encephalitis" hypothesis of schizophrenia. If neurovascular abnormalities prove to be etiologically relevant to the neurobiology of schizophrenia, then targeting these abnormalities may represent a promising therapeutic strategy.

Objectives: To determine the effect of anti-tuberculin antibodies in the T-cell proliferation in response to tuberculin and Candida antigens in individuals with different levels of tuberculosis (TB) risk., Methods: Sixteen high-risk TB individuals, 30 with an intermediate TB risk (group A), and 45 with a low TB risk (group B), as well as 49 control individuals, were studied. Tuberculin skin test (TST) results were analyzed and serum levels of antibodies (IgG and IgM) against purified protein derivative (PPD) were measured by ELISA. Tuberculin and Candida antigens were used to stimulate T-cell proliferation in the presence of human AB serum or autologous serum., Results: High levels of anti-tuberculin IgG antibodies were found to be significantly associated with the blocking of T-cell proliferation responses in cultures stimulated with tuberculin but not with Candida antigens in the presence of autologous serum. This phenomenon was particularly frequent in high-risk individuals with high levels of anti-tuberculin IgG antibodies in the autologous serum when compared to the other risk groups, which exhibited lower levels of anti-tuberculin antibodies., Conclusions: Although cellular immunity plays a central role in the protection against TB, humoral immunity is critical in the control of Mycobacterium tuberculosis infection in high-risk individuals with latent TB infection., (Copyright © 2015 The Authors. Published by Elsevier Ltd.. All rights reserved.)