Mercoledì, 02 Dicembre 2020

Chinese scientists find all the genetic building blocks of SARS in a single population of horseshoe bats.

After a detective hunt across China, researchers chasing the origin of the deadly SARS virus have finally found their smoking gun. In a remote cave in Yunnan province, virologists have identified a single population of horseshoe bats that harbours virus strains with all the genetic building blocks of the one that jumped to humans in 2002, killing almost 800 people around the world.

The killer strain could easily have arisen from such a bat population, the researchers report in PLoS Pathogens1 on 30 November. They warn that the ingredients are in place for a similar disease to emerge again.

In late 2002, cases of a mystery pneumonia-like illness began occurring in Guangdong province, southeastern China. The disease, dubbed severe acute respiratory syndrome (SARS), triggered a global emergency as it spread around the world in 2003, infecting thousands of people.


Scientists identified the culprit as a strain of coronavirus and found genetically similar viruses in masked palm civets (Paguma larvata) sold in Guangdong’s animal markets. Later surveys revealed large numbers of SARS-related coronaviruses circulating in China’s horseshoe bats (Rhinolophus)2 — suggesting that the deadly strain probably originated in the bats, and later passed through civets before reaching humans. But crucial genes — for a protein that allows the virus to latch onto and infect cells — were different in the human and known bat versions of the virus, leaving room for doubt about this hypothesis.

 

Full article 

 

Pubblicato in Scienceonline
Mercoledì, 02 Dicembre 2020 14:32

SARS-CoV-2, come prevenire il contagio indoor



Mantenere il giusto grado di umidità e un adeguato ricambio d’aria evita la propagazione del virus negli ambienti al chiuso, specialmente dove il rischio è più alto, come ospedali e studi medici. Lo conferma uno studio internazionale condotto, tra gli altri, da ricercatori Cnr-Isac e pubblicato sull’International Journal of Environmental Research and Public Health.

È risaputo che il Sars-Cov-2 non si trasmette solo per contatto diretto, ma può diffondersi attraverso l’aria tramite “droplet”, le goccioline di saliva nebulizzata. “Sebbene il virus, di per sè, abbia dimensioni dell’ordine di un centinaio di nanometri (il diametro di un capello è di 50.000-180.000 nanometri), è verificato che una persona infetta, attraverso la respirazione, la vocalizzazione, la tosse, gli starnuti, può emettere un aerosol contenente potenzialmente il SARS-CoV-2”, spiega Francesca Costabile, ricercatrice dell’Istituto di scienze dell’atmosfera e del clima del Consiglio nazionale delle ricerche (Cnr-Isac).
Uno studio pubblicato sull’International Journal of Environmental Research and Public Health da Cnr-Isac, in collaborazione con il tedesco Leibniz Institute for Tropospheric Research, il CSIR-National Physical Laboratory indiano e il 2B Technologies- Boulder (USA), suggerisce opportune strategie di prevenzione e mitigazione del rischio di trasmissione aerea del virus.

Pubblicato in Medicina



Mentre il mondo affronta la seconda ondata di COVID-19, che trova le sue radici profonde nei nostri impatti sulla natura (come già anticipato nel report WWF  “Pandemie, l’effetto boomerang della distruzione degli ecosistemi” e rilanciato dal recente report IPBES  Escaping the ‘Era of Pandemics’) è sempre più chiaro come un’altra delle emergenze globali stia mettendo sempre più a rischio la nostra salute e la nostra stessa sicurezza: il cambiamento climatico.

Oggi come non mai siamo in grado di valutare quanto sia importante essere pronti ad affrontare le emergenze sanitarie globali. Proprio per questa ragione è necessario prevedere i rischi legati al cambiamento climatico in atto anche nelle politiche sanitarie nazionali. Proprio in questi giorni la rivista Scientific American ha lanciato un appello per l’istituzione di un Istituto Nazionale su Clima e Salute negli USA (We Need a National Institute of Climate Change and Health - Scientific American). Anche l’Europa e l’Italia devono prepararsi a impatti che non potremo più evitare, oltre che fare di tutto per evitare gli impatti peggiori.

Pubblicato in Ambiente
Mercoledì, 02 Dicembre 2020 13:44

Immunomodulatory effects of lactoferrin

 


Abstract


Lactoferrin (Lf) is an iron-binding glycoprotein of the transferrin family, which is expressed in most biological fluids with particularly high levels in mammalian milk. Its multiple activities lie in its capacity to bind iron and to interact with the molecular and cellular components of hosts and pathogens. Lf can bind and sequester lipopolysaccharides, thus preventing pro-inflammatory pathway activation, sepsis and tissue damages. Lf is also considered a cell-secreted mediator that bridges the innate and adaptive immune responses. In the recent years much has been learned about the mechanisms by which Lf exerts its activities. This review summarizes the recent advances in understanding the mechanisms underlying the multifunctional roles of Lf, and provides a future perspective on its potential prophylactic and therapeutic applications.

https://www.nature.com/articles/aps2013200

Bibliography:

 - Ali O.M. et al. Synthesis of lactoferrin mesoporous silica nanoparticles for pemetrexed/ellagic acid synergistic breast cancer therapy. Colloids Surf B. Biointerfaces. 2020 Apr; vol.188:110824.

 - Awadasseid A. et al.; Initial success in the identification and management of the coronavirus disease 2019 (COVID-19) indicates human-to-human transmission in Wuhan, China. Int J Biol Sci. 2020 Apr 6;16(11):1846-1860. doi: 10.7150/ijbs.45018. eCollection 2020.

 - Binte Aziz Asma; Debate on Bacille Calmette-Guérin vaccination against COVID-19: Is it worth performing clinical trials? Biosafety and Health, 2020

 - Blaess M. et al.; COVID-19/SARS-CoV-2 Infection: Lysosomes and Lysosomotropism Implicate New Treatment Strategies and Personal Risks. Int J Mol Sci. 2020 Jul 13;21(14):4953. doi: 10.3390/ijms21144953.

 - Campione Elena et al.; Lactoferrin as Protective Natural Barrier of Respiratory and Intestinal Mucosa against Coronavirus Infection and Inflammation; Int. J. Mol. Sci. 2020, 21(14), 4903

 - Chang Raymond, Tzi Bun Ng, Wei-ZenSun; Lactoferrin as potential preventative and adjunct treatment for COVID-19; International Journal of Antimicrobial Agents Volume 56, Issue 3, September 2020, 106118

 - Church Dawson et al., App-Based Delivery of Clinical Emotional Freedom Techniques: Cross-Sectional Study of App User Self-Ratings; JMIR Mhealth Uhealth, 2020

 - Deshmukh V, et al.; COVID-19: a conundrum to decipher. Eur Rev Med Pharmacol Sci. 2020 May;24(10):5830-5841. doi: 10.26355/eurrev_202005_21378.

 - Donovan Sharon M.; The Role of Lactoferrin in Gastrointestinal and Immune Development and Function: A Preclinical Perspective. The Journal of Pediatrics VOLUME 173, SUPPLEMENT , S16-S28, JUNE 01, 2016

 - Doyle Lex W. & Jeanie L. Y. Cheong. Does bovine lactoferrin prevent late-onset neonatal sepsis? The Lancet VOLUME 393, ISSUE 10170, P382-384, FEBRUARY 02, 2019

 - Drago-Serrano et al.; Lactoferrin: Balancing Ups and Downs of Inflammation Due to Microbial Infections; Int J Mol Sci, 2017

 - ELFIN Trial Investigators Group; Enteral lactoferrin supplementation for very preterm infants: a randomised placebo-controlled trial. Lancet VOLUME 393, ISSUE 10170, P423-433, FEBRUARY 02, 2019

 - Elzoghby Ahmed O.et al. Lactoferrin, a multi-functional glycoprotein: Active therapeutic, drug nanocarrier & targeting ligand

 - Fernández-Lázaro Diego et al.; Physical Exercise as a Multimodal Tool for COVID-19: Could It Be Used as a Preventive Strategy? Int J Environ Res Public Health

 - Kaur Gurpreet & Geeta Gathwala. Efficacy of Bovine Lactoferrin Supplementation in Preventing Late-onset Sepsis in low Birth Weight Neonates: A Randomized Placebo-Controlled Clinical Trial. Journal of Tropical Pediatrics, Volume 61, Issue 5, October 2015, Pages 370–376

 - Giulia Martina Cavestro, Veronica Iori, Nadia Dal Bò, Angelo Franzè et all Lactoferrin: Mechanism of action, clinical significance and therapeutic relevance

   Original Article 

 - Groves Merton L. The Isolation of a Red Protein from Milk2. J. Am. Chem. Soc. 1960, 82, 13, 3345–3350

 - Jawhara et al.; Could Intravenous Immunoglobulin Collected from Recovered Coronavirus Patients Protect against COVID-19 and Strengthen the Immune System of New Patients? Int J Mol Sci, 2020

 - Legrand Dominique. Overview of Lactoferrin as a Natural Immune Modulator. The Journal of Pediatrics VOLUME 173, SUPPLEMENT , S10-S15, JUNE 01, 2016

 - Mirabelli Carmen et al.; Morphological Cell Profiling of SARS-CoV-2 Infection Identifies Drug Repurposing Candidates for COVID-19; BioRxiv. Preprint. NaN NaN [revised 2020 Sep 28].

   Original articol 

 - Niaz Bushra et al. Lactoferrin (LF): a natural antimicrobial protein

 - Pammi Mohan & Gautham Suresh; Enteral lactoferrin supplementation for prevention of sepsis and necrotizing enterocolitis in preterm infants. Cochrane Database Syst. Rev.2017 Jun 28;6(6):CD007137.

 -  Root‐Bernstein Robert Age and Location in Severity of COVID‐19 Pathology: Do Lactoferrin and Pneumococcal Vaccination Explain Low Infant Mortality and Regional Differences?

   https://www.youtube.com/watch?v=GODBYRbPL00&feature=youtu.be

   Original article 

  - Sreus A. G. et al.; COVID-19 during Pregnancy and Postpartum: Antiviral Spectrum of Maternal Lactoferrin in Fetal and Neonatal Defense; Journal of Dietary Supplements; 08 Nov 2020

    Original article 

 - Satué-Gracia M. T. et al. Lactoferrin in infant formulas: effect on oxidation. J. Agric. Food Chem. 2000 Oct;48(10):4984-90.

 - Superti Fabiana. Lactoferrin from Bovine Milk: A Protective Companion for Life. Nutrients 2020, 12(9), 2562

 - Takayama Y & Reiji Aoki - Biochemistry and Cell Biology = Biochimie et Biologie Cellulaire, 14 Feb 2012, 90(3):497-503 Roles of lactoferrin on skin wound healing

 - Takayama Y. & Takezawa T. Lactoferrin promotes collagen gel contractile activity of fibroblasts mediated by lipoprotein receptors. Biochemistry and Cell Biology = Biochimie et Biologie Cellulaire, 01 Jun 2006, 84(3):268-274

 - Trend Stephanie et al.; Levels of innate immune factors in preterm and term mothers’ breast milk during the 1st month postpartum. British Journal of Nutrition Volume 115 supplement 7.

  - Universidad Peruana Cayetano Heredia; Lactoferrin for Prevention of COVID-19 in Health Care Workers

 - Università Tor Vergata - Una risposta contro il Covid-19: la glicoproteina lattoferrina, una componente dell’immunità innata

 - Zhai Xiaofeng et al; Comparison of Severe Acute Respiratory Syndrome Coronavirus 2 Spike Protein Binding to ACE2 Receptors from Human, Pets, Farm Animals, and Putative Intermediate Hosts.; J Virol. 2020 Jul 16;94(15):e00831-20. doi: 10.1128/J. Vi.00831-20. Print 2020 Jul 16.

 - Zhang Wan-Ying et al.: Molecular mechanism prediction analysis of compound Kushen injection in the treatment of COVID-19 based on network pharmacology and molecular docking. Traditional Medicine Research 2020, 5 (5): 413-424. doi: 10.12032/TMR20200518180

 - Zhang Wan-Ying et al.; Treating COVID-19 by traditional Chinese medicine: a charming strategy?Traditional Medicine Research 2020, Vol. 5 Issue (4): 178-181 

Pubblicato in Scienceonline

 

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