Minimal information for studies of extracellular vesicles (MISEV2023): From basic to advanced approaches

Extracellular vesicles (EVs), through their complex cargo, can reflect the state of their cell of origin and change the functions and phenotypes of other cells. These features indicate strong biomarker and therapeutic potential and have generated broad interest, as evidenced by the steady year-on-year increase in the numbers of scientific publications about EVs. Important advances have been made in EV metrology and in understanding and applying EV biology. However, hurdles remain to realising the potential of EVs in domains ranging from basic biology to clinical applications due to challenges in EV nomenclature, separation from non-vesicular extracellular particles, characterisation and functional studies. To address the challenges and opportunities in this rapidly evolving field, the International Society for Extracellular Vesicles (ISEV) updates its 'Minimal Information for Studies of Extracellular Vesicles', which was first published in 2014 and then in 2018 as MISEV2014 and MISEV2018, respectively. The goal of the current document, MISEV2023, is to provide researchers with an updated snapshot of available approaches and their advantages and limitations for production, separation and characterisation of EVs from multiple sources, including cell culture, body fluids and solid tissues. In addition to presenting the latest state of the art in basic principles of EV research, this document also covers advanced techniques and approaches that are currently expanding the boundaries of the field. MISEV2023 also includes new sections on EV release and uptake and a brief discussion of in vivo approaches to study EVs. Compiling feedback from ISEV expert task forces and more than 1000 researchers, this document conveys the current state of EV research to facilitate robust scientific discoveries and move the field forward even more rapidly

Exercise training in pulmonary hypertension: an updated systematic review with meta-analysis

Given that previous reviews on exercise training in pulmonary hypertension (PH) were largely based on a small number of randomized controlled trials (RCT), their conclusions are subject to bias. This review sought to identify the impact of exercise training on functional capacity and health-related quality of life (HRQoL) in PH using advanced statistical approaches such as meta-analysis by stratification according to study design. Five databases were searched from January 2015 to April 2020 to update a previous review. Included articles had data extracted, risk of bias (ROB) assessed, and quality rating performed. Data were analyzed using meta-analysis with a random-effects model for 6-min walk test (6MWT) distance and HRQoL. Heterogeneity was explored using stratified meta-analysis, within patient correlation and meta-regression. A total of 28 studies (11 RCT, 12 pre-/post-studies, 2 two-group non-RCT, and three case series) consisting of 1264 patients were included. Meta-analysis of six RCT demonstrated an improved 6MWT distance by 49.5 m (95% CI, 27.2-71.8: I2 = 73%; 254 participants; low-moderate ROB) with a low correlation coefficient of 0.34, while the 12 pre-/post-non-RCT showed an improvement of 68.69 m (95% CI, 50.50-86.69: I2 = 36%; 784 participants; high ROB) along with improvements in V˙ o2peak (weighted mean difference [WMD] = 3.03 mL/kg/min, 95% CI, 2.17-3.90: I2 = 0%, P = .82), and HRQoL (WMD = 2.74: 95% CI, -0.82 to 6.30). Metaregression showed that the benefit of exercise on 6MWT distance did not significantly vary across the trial study characteristics. This updated review identified an additional body of evidence supporting the efficacy of exercise training on 6MWT distance and HRQoL in stable PH patients. These benefits appeared to be consistent across models of delivery

Synthesis and Characterization of 1,3,4-Thiadiazole and 1,3,4-Oxadiazole Derivatives Containing 2-Chloropyridin-5-yl-methyl Moiety.

2170-2174Reaction of 2-chloropyridine-5-acetic acid hydrazide 1 with aroyl isothiocyanates 2a-e yields 4-aroyl -1-(2-chloropyridine-5-acetyl)thiosemicarbazides 3a-e. The cyaclization of 3a-e with conc. sulphuric acid and with iodine in the presence of potassium iodide affords 2-chloro-5-(5-aroylamino-1,3,4-thidiazol -2-yl-methyl)pyridines 4a-e and 2-chloro-5-(5-aroylamino-1 ,3,4-oxadiazol-2-yl-methyl) pyridines 5a-e respectively

Synthesis and characterization of 1,3,4-thiadiazole and 1,3,4-oxadiazole derivatives containing 2-chloropyridin-5-yl-methyl moiety

2170-2174Reaction of 2-chloropyridine-5-acetic acid hydrazide 1 with aroyl isothiocyanates 2a-e yields 4-aroyl -1-(2-chloropyridine-5-acetyl)thiosemicarbazides 3a-e. The cyaclization of 3a-e with conc. sulphuric acid and with iodine in the presence of potassium iodide affords 2-chloro-5-(5-aroylamino-1,3,4-thidiazol -2-yl-methyl)pyridines 4a-e and 2-chloro-5-(5-aroylamino-1 ,3,4-oxadiazol-2-yl-methyl) pyridines 5a-e respectively

Synthesis and insecticidal activity of some 1,3,4-oxadiazoles derived from 2-chloropyridine-5-acetic acid

864-868The synthesis of a number of 1,3,4-oxadiazoles 6a-e is described . 2-Chloropyridine-5-aeetic acid 3 is prepared starting from easily available 2-chl oro-5-chloromethylpyridine 1, via 2-chloro-5 -cyanomethylpyridine 2. Esterification of 3 with methanol in the presence of H2SO4 gives the corresponding methyl ester 4. Hydrazinolysis of 4 with hydrazin hydrate affords 2-chloropyridine-5-acetic acid hydrazide 5. Hydrazide 5 on reacting with aroyl chlorides in the presence of POCl3 yields 2-chloro-5 -(5-aryl-1 ,3,4-oxadiazol-2 -yl)methylpyridines 6a-c

Exercise improves systemic metabolism in a monocrotaline model of pulmonary hypertension

Exercise training in pulmonary arterial hypertension (PAH) has been gaining popularity with guidelines now recommending it as an important adjunct to medical therapy. Despite improvements in function and quality of life, an understanding of metabolic changes and their mechanisms remain unexplored. The objective of this study was therefore to understand the metabolic basis of exercise in a monocrotaline model of PAH.24 male Wistar rats (age: 8–12 weeks and mean body weight: [262.16 ​± ​24.49] gms) were assigned to one of the four groups (i.e., Control, PAH, Exercise and PAH ​+ ​Exercise). The exercise groups participated in treadmill running at 13.3 ​m/min, five days a week for five weeks. Demographic and clinical characteristics were monitored regularly. Following the intervention, LC-MS based metabolomics were performed on blood samples from all groups at the end of five weeks. Metabolite profiling, peak identification, alignment and isotope annotation were also performed. Statistical inference was carried out using dimensionality reducing techniques and analysis of variance.Partial-least-squares discrimination analysis and variable importance in the projection scores showed that the model was reliable, and not over lifting. The analysis demonstrated significant perturbations to lipid and amino acid metabolism, arginine and homocysteine pathways, sphingolipid (p ​< ​0.05), glycerophospholipid (p ​< ​0.05) and nucleotide metabolism in PAH. Exercise, however, was seen to restore arginine (p ​< ​0.05) and homocysteine(p ​< ​0.000 1) levels which were independent effects, irrespective of PAH.Dysregulated arginine and homocysteine pathways are seen in PAH. Exercise restores these dysregulated pathways and could potentially impact severity and outcome in PAH