STAT3 and SOCS3 regulate NG2 cell proliferation and differentiation after contusive spinal cord injury.

NG2 cells, also known as oligodendrocyte progenitors or polydendrocytes, are a major component of the glial scar that forms after spinal cord injury. NG2 cells react to injury by proliferating around the lesion site and differentiating into oligodendrocytes and astrocytes, but the molecular mechanism is poorly understood. In this study, we tested the role of the transcription factor STAT3, and its suppressor SOCS3, in NG2 cell proliferation and differentiation after spinal cord injury. Using knockout mice in which STAT3 or SOCS3 are genetically deleted specifically in NG2 cells, we found that deletion of STAT3 led to a reduction in oligodendrogenesis, while deletion of SOCS3 led to enhanced proliferation of NG2 cells within the glial scar after spinal cord injury. Additionally, STAT3 and SOCS3 were not required for astrogliogenesis from NG2 cells after spinal cord injury. Interestingly, genetic deletion of STAT3 and SOCS3 did not have opposing effects, suggesting that SOCS3 may have targets other than the STAT3 pathway in NG2 cells after spinal cord injury. Altogether, our data show that both STAT3 and SOCS3 play important, yet unexpected, roles in NG2 cell proliferation and differentiation after spinal cord injury.

Palliative medicine in the intensive care unit: needs, delivery, quality.

BACKGROUND: 15%-20% of critical care patients die during their hospital admission. This service evaluation assesses quality of palliative care in intensive care units (ICUs) compared with national standards. METHODS: Retrospective review of records for all patients who died in four ICUs (irrespective of treatment limitation) between 1 June and 31 July 2019. Descriptive statistics reported for patient characteristics, length of stay, admission route, identification triggers and palliative care delivery. RESULTS: Forty-five patients died, two records were untraced, thus N=43. The dying process was recognised in 88% (n=38). Among those where dying was recognised (N=35), 97% (34) had documented family discussion before death, 9% (3) were offered religious/spiritual support, 11% (4) had review of hydration/nutrition and 6% (2) had documented preferred place of death. Prescription of symptom control medications was complete in 71% (25) opioids, 34% (12) haloperidol, 54% (19) midazolam and 43% (15) hyoscine. Combining five triggers-length of stay >10 days prior to ICU admission 7% (3), multiorgan failure ≥3 systems 33% (14), stage IV malignancy 5% (2), post-cardiac arrest 23% (10) and intracerebral haemorrhage requiring mechanical ventilation 12% (5)-identified 60% (26) of patients. Referral to the palliative care team was seen in 14% (5), and 8% (3) had specialist palliative care team review. CONCLUSIONS: Recognition of dying was high but occurred close to death. Family discussions were frequent, but religious/spiritual needs, hydration/nutrition and anticipatory medications were less often considered. The ICUs delivered their own palliative care in conjunction with specialist palliative care input. Combining five triggers could increase identification of palliative care needs, but a larger study is needed.

A Novel Poly(vinyl alcohol)-tetraethylorthosilicate Hybrid Gel Electrolyte for Lead Storage Battery.

The gel electrolyte significantly influences gel valve-regulated lead acid battery performance. To address this, the paper describes the preparation of novel polymer gel electrolytes using poly (vinyl alcohol) (PVA) and tetraethylorthosilicate (TEOS) for valve-regulated lead-acid batteries. FTIR technique is used to confirm the chemical reaction between PVA and TEOS. Electrochemical analyses such as cyclic voltammetry and electrochemical impedance spectroscopy were applied to optimize the concentration of PVA-TEOS polymer gel electrolyte. The optimum concentration of polymer gel electrolyte was determined as 20 wt% of TEOS in PVA (PE-1) with higher anodic peak and lower Rs and Rct values. The Galvanostatic charge-discharge tests were performed on the optimized gel system prototype battery. The highest capacity of 6.86 × 10-5 Ah at a current density of 0.2 mA cm-2 was achieved with an excellent capacity retention ratio of 85.7% over 500 cycles. The exceptional cycle performance and high capacity make PVA-TEOS gel electrolyte a promising candidate for practical battery application.

3D Imaging of Axons in Transparent Spinal Cords from Rodents and Nonhuman Primates

The histological assessment of spinal cord tissue in three dimensions has previously been very time consuming and prone to errors of interpretation. Advances in tissue clearing have significantly improved visualization of fluorescently labelled axons. While recent proof-of-concept studies have been performed with transgenic mice in which axons were prelabeled with GFP, investigating axonal regeneration requires stringent axonal tracing methods as well as the use of animal models in which transgenic axonal labeling is not available. Using rodent models of spinal cord injury, we labeled axon tracts of interest using both adeno-associated virus and chemical tracers and performed tetrahydrofuran-based tissue clearing to image multiple axon types in spinal cords using light sheet and confocal microscopy. Using this approach, we investigated the relationships between axons and scar-forming cells at the injury site as well as connections between sensory axons and motor pools in the spinal cord. In addition, we used these methods to trace axons in nonhuman primates. This reproducible and adaptable virus-based approach can be combined with transgenic mice or with chemical-based tract-tracing methods, providing scientists with flexibility in obtaining axonal trajectory information from transparent tissue.

Iron deficiency anaemia: an unusual complication of Meckel's diverticulum.

OBJECTIVES: To describe a case of Meckel's diverticulum with an unusual complication of iron deficiency anaemia due to chronic intestinal bleeding. CLINICAL PRESENTATION AND INTERVENTION: A 12-year-old boy presented with bloody diarrhoea and abdominal pain in association with a long-standing history of black stools and progressive pallor. Biochemical tests revealed low serum iron (1.2 mmol/l) indicating iron deficiency anaemia and low serum albumin (29 g/l). The other tests were normal. Colonoscopy performed on the 8th day of hospitalization was normal. A technetium-99m pertechnetate scan showed an ectopic gastric mucosa in the Meckel's diverticulum confirmed at surgery in the region of the antimesentric border and on histopathology. CONCLUSION: Findings indicated that the patient had a bleeding Meckel's diverticulum, complicated by iron deficiency anaemia.