SARS-CoV-2 infection induces thymic atrophy mediated by IFN-γ in hACE2 transgenic mice.

Pathogenic infections cause thymic atrophy, perturb thymic T-cell development, and alter immunological response. Previous studies reported dysregulated T-cell function and lymphopenia in coronavirus disease-19 (COVID-19). However, immunopathological changes in the thymus associated with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection have not been elucidated. Here, we report that SARS-CoV-2 infects thymocytes, and induces CD4+CD8+ (double positive; DP) T-cell apoptosis leading to thymic atrophy and loss of peripheral TCR repertoire in K18-hACE2 transgenic mice. Infected thymus led to increased CD44+CD25- T-cells, indicating an early arrest in the T-cell maturation pathway. Thymic atrophy was notably higher in male hACE2-Tg mice than in females and involved an upregulated de-novo synthesis pathway of thymic glucocorticoid. Further, IFN-γ was crucial for thymic atrophy, as anti-IFN-γ -antibody neutralization blunted thymic involution. Therapeutic use of Remdesivir also rescued thymic atrophy. While the Omicron variant and its sub-lineage BA.5 variant caused marginal thymic atrophy, the delta variant of SARS-CoV-2 exhibited severe thymic atrophy characterized by severely depleted DP T-cells. Recently characterized broadly SARS-CoV-2 neutralizing monoclonal antibody P4A2 was able to rescue thymic atrophy and restore the thymic maturation pathway of T-cells. Together, we report SARS-CoV-2-associated thymic atrophy resulting from impaired T-cell maturation pathway which may contribute to dyregulated T cell response during COVID-19.

Fostering effective and sustainable scientific collaboration and knowledge exchange: a workshop-based approach to establish a national ecological observatory network (NEON) domain-specific user group.

The decision to establish a network of researchers centers on identifying shared research goals. Ecologically specific regions, such as the USA's National Ecological Observatory Network's (NEON's) eco-climatic domains, are ideal locations by which to assemble researchers with a diverse range of expertise but focused on the same set of ecological challenges. The recently established Great Lakes User Group (GLUG) is NEON's first domain specific ensemble of researchers, whose goal is to address scientific and technical issues specific to the Great Lakes Domain 5 (D05) by using NEON data to enable advancement of ecosystem science. Here, we report on GLUG's kick off workshop, which comprised lightning talks, keynote presentations, breakout brainstorming sessions and field site visits. Together, these activities created an environment to foster and strengthen GLUG and NEON user engagement. The tangible outcomes of the workshop exceeded initial expectations and include plans for (i) two journal articles (in addition to this one), (ii) two potential funding proposals, (iii) an assignable assets request and (iv) development of classroom activities using NEON datasets. The success of this 2.5-day event was due to a combination of factors, including establishment of clear objectives, adopting engaging activities and providing opportunities for active participation and inclusive collaboration with diverse participants. Given the success of this approach we encourage others, wanting to organize similar groups of researchers, to adopt the workshop framework presented here which will strengthen existing collaborations and foster new ones, together with raising greater awareness and promotion of use of NEON datasets. Establishing domain specific user groups will help bridge the scale gap between site level data collection and addressing regional and larger ecological challenges.

Methotrimeprazine is a neuroprotective antiviral in JEV infection via adaptive ER stress and autophagy.

Japanese encephalitis virus (JEV) pathogenesis is driven by a combination of neuronal death and neuroinflammation. We tested 42 FDA-approved drugs that were shown to induce autophagy for antiviral effects. Four drugs were tested in the JE mouse model based on in vitro protective effects on neuronal cell death, inhibition of viral replication, and anti-inflammatory effects. The antipsychotic phenothiazines Methotrimeprazine (MTP) & Trifluoperazine showed a significant survival benefit with reduced virus titers in the brain, prevention of BBB breach, and inhibition of neuroinflammation. Both drugs were potent mTOR-independent autophagy flux inducers. MTP inhibited SERCA channel functioning, and induced an adaptive ER stress response in diverse cell types. Pharmacological rescue of ER stress blocked autophagy and antiviral effect. MTP did not alter translation of viral RNA, but exerted autophagy-dependent antiviral effect by inhibiting JEV replication complexes. Drug-induced autophagy resulted in reduced NLRP3 protein levels, and attenuation of inflammatory cytokine/chemokine release from infected microglial cells. Our study suggests that MTP exerts a combined antiviral and anti-inflammatory effect in JEV infection, and has therapeutic potential for JE treatment.

Correlation of Nuclear Morphometry with Clinicopathologic Parameters in Malignant Breast Aspirates.

Shilpa GargBackground Nuclear size, shape, chromatin pattern, and nucleolar size and number have all been reported to change in breast cancer. Aim The aim of the study was to quantify nuclear changes on malignant breast aspirates using morphometry and to correlate the morphometric parameters with clinicopathologic features such as cytologic grade, tumor size, lymph node status, mitotic index, and histopathologic grade. Materials and Methods Forty-five cases of carcinoma breast diagnosed on cytology were included in this study. Cytologic grading was performed as per the Robinson's cytologic grading system. Nuclear morphometry was done on Papanicolaou stained smears. One hundred nonoverlapping cells per case were evaluated. Both geometrical and textural parameters were evaluated. Results Comparison of cytologic grades with most morphometric features (nuclear area, perimeter, shape, long axis, short axis, intensity, total run length, and TI homogeneity) was highly significant on statistical analysis. Correlation with tumor size yielded significant results for nuclear area, perimeter, long and short axes, and intensity with p < 0.05. The study of lymph node status and morphometry showed a highly significant statistical association with all the parameters. Mitotic count was significantly associated with all the geometric parameters and one textural parameter (total run length). On correlation of ductal carcinoma in situ and histopathological Grades 1 to 3 with morphometry, it was found that all the parameters except long-run emphasis were highly significant with p < 0.001. Conclusion Morphometry as a technique holds immense promise in prognostication in breast carcinoma.

Correlation of Nuclear Morphometry with Clinicopathologic Parameters in Malignant Breast Aspirates.

Objectives The primary objective of this study was to correlate nuclear morphometric parameters with clinicopathologic features such as cytologic grade, tumor size, lymph node status, mitotic index, and histopathologic grade. Secondary objective was to quantify nuclear changes on malignant breast aspirates using morphometry. Material and Methods Forty-five cases of carcinoma breast diagnosed on cytology were included in this study. These were graded into cytologic grades 1, 2, and 3 as per Robinson's cytologic grading system. Nuclear morphometry was done in all cases on smears stained with Papanicolaou stain. Clinicopathologic parameters including cytological grade, tumor size, lymph node status, mitotic count, and histological grade were correlated with nuclear morphometric parameters, namely, area, perimeter, shape, long axis, short axis, intensity, long-run emphasis, total run length, and T1 homogeneity. Results There were 9 cases in cytologic grade 1, 26 in grade 2, and 10 cases in cytologic grade 3. Histopathology showed 42 cases of infiltrating duct carcinoma, not otherwise specified (IDC, NOS) and 3 cases (6.7%) of ductal carcinoma in situ (DCIS). IDC (NOS) included 6, 27, and 9 cases in grades 1, 2, and 3, respectively. Majority of our cases had a tumor size less than 5 cm ( n = 38, 84.4%) and had positive nodes ( n = 30, 66.7%). Correlation of cytologic and histopathologic grades (including DCIS) with all morphometric features except long-run emphasis was statistically significant. Correlation of morphometry with tumor size yielded significant results for nuclear area, perimeter, long and short axes, and intensity with p < 0.05. Study of lymph node status (positive/negative) versus morphometry showed a highly significant statistical association with all the geometric as well as textural parameters. Mitotic count was significantly associated with all the geometric parameters and one textural parameter (total run length). Statistics Continuous variables were presented as mean ± standard deviation and compared using the two-tailed, independent sample t -test and one-way analysis of variance test. Tests were performed at significance level of 0.05. Conclusion Morphometry is an objective technique which holds immense promise in prognostication in breast carcinoma.

Risk factors for readmission with dehydration after ileostomy formation: A systematic review and meta-analysis.

AIM: Ileostomy formation is a commonly performed procedure with substantial associated morbidity. Patients with an ileostomy experience high rates of unplanned hospital readmission with dehydration, and such events have a long-term health and economic impact. Reports of the significant risk factors associated with these readmissions have been inconsistent. This study aimed to identify the significant risk factors for readmission with dehydration following ileostomy formation. METHOD: A systematic search was conducted using the Medline, Embase, Cochrane and CINAHL databases. All original research articles reporting risk factors for readmission with dehydration following ileostomy formation in adults were included. The primary outcome was the pooled risk ratio of clinically relevant variables potentially associated with dehydration-related readmission following ileostomy formation. The secondary outcome was the incidence of dehydration-related readmission. RESULTS: Ten studies (27 089 patients) were included. The incidences of 30- and 60-day readmission with dehydration were 5.0% (range 2.1%-13.2%) and 10.3% (range 7.3%-14.1%), respectively. Eight variables were found to be significantly associated with dehydration-related readmission: age ≥65 years, body mass index ≥30 kg/m2 , diabetes mellitus, hypertension, renal comorbidity, regular diuretic use, ileal pouch-anal anastomosis procedure and length of stay after index admission. A preoperative diagnosis of colorectal cancer was less likely to result in readmission with dehydration. CONCLUSION: Readmission with dehydration following ileostomy formation is a significant issue with several risk factors. Awareness of these risk factors will help inform the design of future studies addressing risk prediction, allow risk stratification of ileostomates and aid in the development of personalized prevention strategies.

A retrospective, 5-year, clinicoepidemiological study of severe cutaneous adverse reactions (SCARs).

BACKGROUND: A severe cutaneous adverse reaction (SCAR) is a rare, clinically heterogeneous, life-threatening phenomenon that results in serious skin damage, systemic complications, and significant morbidity or mortality comprising of Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), or SJS-TEN overlap, acute generalized exanthematous pustulosis (AGEP), exfoliative dermatitis, and drug rash with eosinophilia and systemic symptoms (DRESS). MATERIALS AND METHODS: A retrospective study was conducted on all cases of SCARs admitted in a tertiary care referral hospital from January 2015 to December 2019. Clinical and epidemiological details were retrieved from the records of patients as per predesigned proforma. The data collected were analyzed and statistically evaluated. RESULTS AND ANALYSIS: A total of 142 patients (67 males, 75 females) with SCARs, constituting 0.08% of total hospital admission and 0.027% of total dermatology outpatient department (OPD), were studied. Age group ranged from 2 to 61 years, with the mean age of 33.6 years (SD = 17.43). Most patients belonged to SJS-TEN complex (75 cases; SJS 48, SJS-TEN 18, TEN nine) followed by exfoliative dermatitis (27 cases/19%), AGEP (26 cases/18.3%), and DRESS (14 cases/9.8%). Anticonvulsants were most commonly implicated (22%) followed by antibiotics (20%), nonsteroidal anti-inflammatory drugs (NSAIDs) (17%), and ayurvedic (7%). There was only single mortality in a DRESS patient. CONCLUSION: SCAR has considerable disease burden with marginal female preponderance in SJS/TEN and exfoliative dermatitis and can involve even the pediatric population. Anticonvulsants followed by antibiotics, NSAIDs, and ayurvedic medicines are common groups known to cause SCARs. To date, there are no definitive recommendations regarding their optimal treatment regimen, hence early diagnosis, prompt withdrawal of culprit drug, high standard of nursing care, and interdisciplinary consultations are vital steps to avoid disease progression and restore health.

Multireceptor targeting of glioblastoma.

BACKGROUND: Treatment for glioblastoma (GBM) remains an unmet need in medicine. Novel therapies that address GBM complexity and heterogeneity in particular are warranted. To this end, we target 4 tumor-associated receptors at a time that span virtually all of the GBM microenvironment including bulk tumor cells, infiltrating tumor cells, neovasculature, and tumor-infiltrating cells with one pharmaceutical agent delivering a cytotoxic load. METHODS: We engineered multivalent ligand-based vector proteins termed QUAD with an ability to bind to 4 of the following GBM-associated receptors: IL-13RA2, EphA2, EphA3, and EphB2. We conjugated QUAD with a modified bacterial toxin PE38QQR and tested it in vitro and in vivo. RESULTS: The QUAD variants preserved functional characteristics of the respective ligands for the 4 receptors. The QUAD 3.0 variant conjugate was highly cytotoxic to GBM cells, but it was nontoxic in mice, and the conjugate exhibited strong antitumor effect in a dog with spontaneous GBM. CONCLUSION: The QUAD addresses, to a large extent, the issues of intra- and intertumoral heterogeneity and, at the same time, it targets several pathophysiologically important tumor compartments in GBM through multiple receptors overexpressed in tumors allowing for what we call "molecular resection." QUAD-based targeted agents warrant further pre- and clinical development.

Proteins involved in actin filament organization are key host factors for Japanese encephalitis virus life-cycle in human neuronal cells.

Multiple membrane trafficking networks operate in the eukaryotic cell and are hijacked by viruses to establish infection. Recent studied have highlighted that viruses can exploit distinct pathways depending on the cell type. Japanese encephalitis virus (JEV), a neurotropic flavivirus, can infect neuronal cells through a clathrin-independent endocytic mechanism. To further characterize the membrane trafficking requirements for JEV infection of neuronal cells, we have performed a RNA interference-based study targeting 136 proteins in the human cell line IMR-32. Through quantitative RT-PCR and plaque assays we have validated that JEV infection in neuronal cells was independent of clathrin, and identified host-factors that were crucial for establishment of infection. Several of these proteins were involved in regulation of actin filament organization such as RHOA, RAC1, proteins of the ARP2/3 complex and N-WASP family, LIMK1, PAK1 and ROCK2. The small molecule inhibitors of ARP2/3 complex, CK-548 and of the N-WASP, Wiskostatin inhibited virus replication highlighting the important roles of these proteins in the virus life-cycle. We also identified ATG12, BECN1, VAPA, VAPB and VCP proteins as crucial host-factors for JEV replication across epithelial and neuronal cell lineages.

Dose dependent enhanced antibacterial effects and reduced biofilm activity against Bacillus subtilis in presence of ZnO nanoparticles.

Bacterial biofilms are self-produced matrix of sticky extracellular polymeric substances. They result in fouling in the food industry, water treatment plants, and possess significant environmental and industrial impacts. Nanoparticles have shown immense potential and have been effective in combating bacterial biofilm, which is the common cause of drug resistance development, biofouling in water treatment plants and the food industry. Hence, in order to explore the same, Zinc oxide nanoparticles have been synthesized by chemical synthesis method and their action against Bacillus subtilis biofilm formation was evaluated in this study by crystal violet and ROS assay. The dose-dependent reduction in biofilm biomass and density was observed as a result of nanoparticle exposure. There was considerable reduction in biofilm formation after treatment with ZnO nanoparticles. Change in surface morphology of the Bacillus subtilis cells was observed which could be due to oxidative stress induced by ZnO nanoparticles. The oxidative stress was estimated by measurement of catalase activity that also showed dose-dependent decrease.

Chyme recycling in the management of small bowel double enterostomy in pediatric and neonatal populations: A systematic review.

BACKGROUND & AIMS: Intestinal failure (IF) in neonatal and pediatric patients is associated with substantial morbidity. Management of IF includes the formation of a double enterostomy (DES) of the small bowel. Parenteral nutrition (PN) is frequently required, which is expensive. Recycling chyme from the proximal DES limb distally is an alternative therapy, but standardized data on this intervention is lacking. This review systematically evaluated the existing literature on chyme recycling (CR) in neonatal and pediatric populations. METHODS: Medical databases were systematically searched for articles reporting CR in neonatal and pediatric populations. Articles documenting CR indications, methods, clinical outcomes, benefits and adverse events (AEs) were reviewed. A narrative synthesis was performed on the extracted data. RESULTS: This review identified 20 full-text articles, in which 289 patients received CR, most commonly following necrotizing enterocolitis (n = 117 patients). The most common motivators for CR were proximally located DES (n = 7 articles) and to support nutrition and growth (n = 7 articles). Proximal DES output collection was predominantly manual (n = 11 articles), whereas distal CR was mostly automated (n = 12 articles), using customized peristaltic or syringe infusion pumps. Clinical benefits encompassed PN reduction (n = 19 patients) or cessation (n = 122 patients), weight gain, normalization of fluid balance, improvement in liver function tests and distal gut maturation. Technical problems commonly included tube dislodgement, leakage and effluent reflux (n = 9 articles). AEs included intestinal perforation (n = 3 patients) and haemorrhage (n = 1 patient). CONCLUSIONS: From the limited available data, CR is demonstrated as an effective therapeutic intervention for small bowel DES in pediatric and neonatal patients. However, standardized methods that improve the delivery of and minimise AEs associated with the intervention are needed.

Drug Conjugates for Targeting Eph Receptors in Glioblastoma.

Glioblastoma (GBM) is a complex and heterogeneous tumor that warrants a comprehensive therapeutic approach for treatment. Tumor-associated antigens offer an opportunity to selectively target various components of the GBM microenvironment while sparing the normal cells within the central nervous system. In this study, we conjugated a multivalent vector protein, QUAD 3.0, that can target four receptors: EphA3, EphA2, EphB2, and also IL-13RA2, spanning virtually 100% of the GBM microenvironment, to doxorubicin derivatives. The conjugates effectively bound to all four receptors, although to varying degrees, and delivered cytotoxic loads to both established and patient-derived GBM cell lines, with IC50 values in the low nM range. The conjugates were also non-toxic to animals. We anticipate that the QUAD 3.0 Dox conjugates will be further used in preclinical models and possibly clinics in the foreseeable future.

Catatonia in N-methyl-d-aspartate receptor antibody encephalitis: Phenomenological characteristics from a systematic review of case reports.

OBJECTIVE: To ascertain the phenomenological characterisation of catatonia in N-methyl-d-aspartate receptor antibody encephalitis (NMDAr-AbE). METHODS: A systematic review of case reports was undertaken in accordance with PRISMA guidelines. Case reports of NMDAr-AbE containing sufficient information on the cases' clinical presentation and meeting the study's inclusion criteria were selected. Cases were searched for clinical data in keeping with core catatonic signs by applying the screening instrument of the Bush-Francis Catatonia Rating Scale. When two or more core signs were ascertained catatonia was considered to be present. RESULTS: 2645 records were identified through the database search. Following screening and application of eligibility/inclusion criteria 139 articles were selected reporting on 189 individual subjects. Catatonia was present in 60% of these cases. The most prevalent signs were immobility/stupor (70%), mutism (67%), excitement (50%), posturing/catalepsy (34%), stereotypies (31%), and rigidity (30%). Immobility/stupor and excitement co-occurred in the same patient in 33% of cases. CONCLUSION: The phenomenological profile of catatonia in this sample of cases of NMDAr-AbE was characterised by a preponderance of signs in the hypokinetic spectrum. However, excitement often co-occurred in these patients suggesting that fluctuations in catatonic semiology may be frequent.

Chyme Reinfusion for Small Bowel Double Enterostomies and Enteroatmospheric Fistulas in Adult Patients: A Systematic Review.

BACKGROUND: High-output double enterostomies (DESs) and enteroatmospheric fistulas (EAFs) of the small bowel account for substantial patient morbidity and mortality. Management may include parenteral nutrition (PN) and prolonged admissions, at high cost. Reinfusion of chyme into the distal bowel is a proposed therapeutic alternative when the distal DES limb is accessible; however, standardized information on this technique is required. This review aimed to critically assess the literature regarding chyme reinfusion (CR) to define its current status and future directions. METHODS: A systematic search of medical databases was conducted for articles investigating CR in adults. Articles reporting indications, methods, benefits, technical issues, and complications resulting from CR were reviewed. A narrative synthesis of the retrieved data was undertaken. RESULTS: In total, 24 articles reporting 481 cases of CR were identified, although articles were heterogeneous in their structure and reporting. CR was most frequently performed for remediation of high-output DES and intestinal failure and for proximally located DES. Effluent output collection was commonly manual, with distal reinfusion more commonly automated, and with few dedicated systems. Multiple benefits attributed to CR were reported, encompassing weight gain, cessation of PN, and improvements in liver function. Technical problems included distaste, labor-intensive methods, reflux of contents, and tube dislodgement. No serious AEs or mortality directly attributable to CR were reported. CONCLUSIONS: CR appears to be a promising, safe and well-validated intervention for small bowel DES and EAF. However, more efficient and acceptable methods are required to promote greater adoption of the practice of CR.

Impact of temporary ileostomy on long-term quality of life and bowel function: a systematic review and meta-analysis.

BACKGROUND: Defunctioning ileostomy is widely used to protect a low colorectal anastomosis. However, the use of an ileostomy may have an impact on long-term bowel function and quality of life after anterior resection. The objectives were to compare bowel function and quality of life outcomes between patients undergoing an anterior resection for rectal cancer, with and without the formation of a diverting ileostomy, and to compare outcomes for early versus late closure of diverting ileostomy. METHOD: A systematic literature review was performed to identify studies published between 2007 and 2018 comparing bowel function and quality of life outcomes after an anterior resection for rectal cancer in those with and without formation of a diverting ileostomy. RESULTS: Four studies (three randomized controlled trials) reported bowel function and quality of life outcomes. Pooled analysis for 227 participants showed that having an ileostomy is associated with twice the risk of suffering from low anterior resection syndrome (odds ratio (major low anterior resection syndrome) 1.96, 95% confidence interval 1.1, 3.5; P = 0.02). There were no consistent differences in quality of life. Based on single studies there is limited evidence of some improvements in bowel function but no difference in quality of life after early compared to late closure of ileostomy. CONCLUSION: There is some evidence for an association between low anterior resection syndrome and the use of a diverting ileostomy to protect a rectal anastomosis. Potential confounders include height of the anastomosis. Further research into the mechanisms underlying this potential association may inform methods to mitigate the harms of an ileostomy.

Co-occurrence of antimicrobial resistance and virulence determinants in enterococci isolated from traditionally fermented fish products.

OBJECTIVES: Fermented foods frequently consumed in Northeast India can act as a reservoir for disseminating pathogenic organisms. Enterococci are often responsible for contamination of food products. This study investigated the antimicrobial resistance and co-existing virulence determinants of enterococci found in traditionally processed foods in India. METHODS: A total of 38 enterococci isolates identified as Enterococcus faecalis isolated from fermented fish samples from retail markets of Northeast India were selected for screening of pathogenic traits. RESULTS: Of the 38 isolates, 8 (21%) were able to hydrolyse gelatin and 13 (34%) showed protease activity. Screening for haemolytic activity of the isolates showed no positive test on sheep blood. The presence of virulence genes (gelE, agg, esp, cpd, efaAfs and cylA) was investigated by PCR. gelE, agg and esp were present in 17, 13 and 4 isolates, respectively. cpd and efaAfs were found in all isolates, whereas cylA was not detected. High resistance percentages to various antibiotics included kanamycin (63%), vancomycin and gentamicin (58%), tetracycline (53%) and rifampicin (50%). The vanA genotype was confirmed in 15 multidrug- and vancomycin-resistant strains. CONCLUSION: The simultaneous occurrence of virulence determinants and antimicrobial resistance in enterococci prevalent in the fermented fish products studied poses a potential threat of transmission to humans through the food chain. This study highlights the importance of E. faecalis as a reservoir of antimicrobial resistance and virulence factors and their potential transfer to humans. The findings reopen the issue of food safety regarding enterococci prevalent in traditionally processed fish products in the region.

Receptor-Targeted Glial Brain Tumor Therapies.

Among primary brain tumors, malignant gliomas are notably difficult to manage. The higher-grade tumors represent an unmet need in medicine. There have been extensive efforts to implement receptor-targeted therapeutic approaches directed against gliomas. These approaches include immunotherapies, such as vaccines, adoptive immunotherapy, and passive immunotherapy. Targeted cytotoxic radio energy and pro-drug activation have been designed specifically for brain tumors. The field of targeting through receptors progressed significantly with the discovery of an interleukin 13 receptor alpha 2 (IL-13RA2) as a tumor-associated receptor over-expressed in most patients with glioblastoma (GBM) but not in normal brain. IL-13RA2 has been exploited in novel experimental therapies with very encouraging clinical responses. Other receptors are specifically over-expressed in many patients with GBM, such as EphA2 and EphA3 receptors, among others. These findings are important in view of the heterogeneity of GBM tumors and multiple tumor compartments responsible for tumor progression and resistance to therapies. The combined targeting of multiple receptors in different tumor compartments should be a preferred way to design novel receptor-targeted therapeutic approaches in gliomas.

Cancer Protrusions on a Tightrope: Nanofiber Curvature Contrast Quantitates Single Protrusion Dynamics.

Cell migration is studied with the traditional focus on protrusion-driven cell body displacement, while less is known on morphodynamics of individual protrusions themselves, especially in fibrous environments mimicking extracellular matrix. Here, using suspended fibers, we report integrative and multiscale abilities to study protrusive behavior independent of cell body migration. By manipulating the diameter of fibers in orthogonal directions, we constrain cell migration along large diameter (2 µm) base fibers, while solely allowing cells to sense, initiate, and mature protrusions on orthogonally deposited high-curvature/low diameter (∼100, 200, and 600 nm) protrusive fibers and low-curvature (∼300 and 600 nm width) protrusive flat ribbons. In doing so, we report a set of morphodynamic metrics that precisely quantitate protrusion dynamics. Protrusion growth and maturation occur by rapid broadening at the base to achieve long lengths, a behavior dramatically influenced by curvature. While flat ribbons universally induce the formation of broad and long protrusions, we quantitatively protrutype protrusive behavior of two highly invasive cancer cell lines and find breast adenocarcinoma (MDA-MB-231) to exhibit sensitivity to fiber curvature higher than that of brain glioblastoma DBTRG-05MG. Furthermore, while actin and microtubules localize within protrusions of all sizes, we quantify protrusion size-driven localization of vimentin and, contrary to current understanding, report that vimentin is not required to form protrusions. Using multiple protrusive fibers, we quantify high coordination between hierarchical branches of individual protrusions and describe how the spatial configuration of multiple protrusions regulates cell migratory state. Finally, we describe protrusion-driven shedding and collection of cytoplasmic debris.

Catatonia in Patients with Dementia Admitted to a Geriatric Psychiatry Ward.

To determine the frequency and characteristics of catatonia in persons with dementia, all patients admitted to an old age psychiatry ward were screened for catatonia with the Bush-Francis Catatonia Screening Instrument (BFCSI) over a period of 6 months. Thirty-seven patients were admitted, and there were 14 patients with dementia. The rate of catatonia in these patients was 42.8% (6 out of 14). Five out of six of these patients received treatment for catatonia with lorazepam, all achieving complete remission. Catatonia occurred frequently in patients admitted with dementia.

Aligned fibers direct collective cell migration to engineer closing and nonclosing wound gaps.

Cell emergence onto damaged or organized fibrous extracellular matrix (ECM) is a crucial precursor to collective cell migration in wound closure and cancer metastasis, respectively. However, there is a fundamental gap in our quantitative understanding of the role of local ECM size and arrangement in cell emergence-based migration and local gap closure. Here, using ECM-mimicking nanofibers bridging cell monolayers, we describe a method to recapitulate and quantitatively describe these in vivo behaviors over multispatial (single cell to cell sheets) and temporal (minutes to weeks) scales. On fiber arrays with large interfiber spacing, cells emerge (invade) either singularly by breaking cell-cell junctions analogous to release of a stretched rubber band (recoil), or in groups of few cells (chains), whereas on closely spaced fibers, multiple chains emerge collectively. Advancing cells on fibers form cell streams, which support suspended cell sheets (SCS) of various sizes and curvatures. SCS converge to form local gaps that close based on both the gap size and shape. We document that cell stream spacing of 375 µm and larger hinders SCS advancement, thus providing abilities to engineer closing and nonclosing gaps. Altogether we highlight the importance of studying cell-fiber interactions and matrix structural remodeling in fundamental and translational cell biology.