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Filter by:Recombinant Bacterial ACE2 receptors -like enzyme of B38-CAP could be promising treatment for COVID-19 infection- and Its inflammatory complications better than recombinant human ACE2 Mahmoud ELkazzaz(1),Tamer Haydara(2),Yousry Abo-amer(3), Quan Liu(4) 1. Department of chemistry and biochemistry, Faculty of Science, Damietta University, Egypt. 2. Department of Internal Medicine, Faculty of Medicine, Kafrelsheikh University, Egypt 3. Hepatology,Gastroenterology and Infectious Diseases Department, Mahala Hepatology Teaching Hospital, Egypt 4. School of Life Sciences and Engineering, Foshan University, Foshan, Guangdong Province; Laboratory of Emerging Infectious Disease, Institute of Translational Medicine, The First Hospital of Jilin University, Changchun, China. Abstract The COVID-19 pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has infected over 100 million people causing over 2.4 million deaths over the world, and it is still expanding. There is an urgent need for targeted and effective COVID-19 treatments which has put great pressure on researchers across the world for developing effective drugs. This paper reviews the possibility of using Recombinant Bacterial ACE2 Receptors -Like Enzyme of B38-CAP to treat SARS-CoV-2 based on the intracellular mechanism of SARS-CoV-2 transmission and consequences caused. Angiotensin-converting enzyme 2 (ACE2) plays a key role in cardiovascular physiology and pathology, and it's being currently being investigated as a potential covid-19 and acute lung failure treatment through several clinical trials.. The SARS-CoV2 binding site was identified as ACE2, a part of the RAAS, which is known to protect the lung from injuries. it has been postulated that SARS-CoV-2 binding to ACE2 may attenuate residual ACE2 activity, skewing the ACE/ACE2 balance to a state of heightened angiotensin II activity leading to inflammatory and oxidative organ damage, as well as pulmonary vasoconstriction, which can lead to acute lung injury.. Therefore, treatment with recombinant soluble ACE2 protein and drugs that up regulate ACE2 may alleviate pulmonary complication. In animal models including heart failure, acute lung injury, and diabetic nephropathy, recombinant human ACE2 protein (rhACE2), which is devoid of its membrane-anchored domain thus soluble, has been shown to have beneficial effects. Despite its positive effects, rhACE2 is a glycosylated protein, which necessitates a time- and cost-intensive protein expression system using mammalian or insect cells, which may be inconvenient in drug production and medical economics. Moreover, we hypothesis that treating COVID-19 patients with recombinant soluble ACE2 protein may induce autoantibodies and T cells to cellular ACE2.Furthermore, rhACE2 may interact with spike protein based vaccine and worsen its effect . These autoantibodies may generated by enforced presentation of the soluble Angiotensin-converting enzyme 2 (ACE2) protein in a complex with COVID-19 Spike protein in fragment crystallizable (FC) Receptor positive Antigen Presenting Cells in the blood The development of autoantibodies might make injury and damage to the host epithelial cells and hamper their ACE2 dependent function in lungs, intestine and testes which express ACE2. In addition to inducing platelet aggregation and thrombosis . Although it has been stated that immune response associated with the chronic infusion of rhACE2 resulting in the degradation of rhACE226, this was not the case with B38-CAP; no antibodies against B38-CAP were detected in the serum of mice infused with B38-CAP for two weeks... In this case we suggest that bacterial engineering could be used to develop better protein drugs for COVID-19 treatment... B38-CAP is an ACE2-like enzyme derived from bacteria that reduces hypertension and cardiac dysfunction. Angiotensin-converting enzyme 2 (ACE2) plays a key role in cardiovascular physiology and pathology, and it is currently being studied in clinical trials to treat acute lung failure. In mice, B38-CAP treatment prevented angiotensin II-induced hypertension, cardiac hypertrophy, and fibrosis. B38-CAP is an ACE2-like enzyme derived from bacteria, demonstrating that evolution has shaped a bacterial carboxypeptidase (B38-CAP) to a human ACE2-like enzyme. As a result, we think that treating COVID-19-infected patients with Bacterial ACE2 like enzymes, rather than human ACE2, may be preferable because it will perform the same role as human ACE2 and may not be recognized by COVID-19 spike protein Keywords: COVID 2019 ,Infection, B38-CAP , Bacterial ACE2 receptors -like enzyme , rhACE226.
COVID-19 caused an unprecedented international crisis. There is an urgent need for an effective regimen to cure this illness. Anecdotal data and some prospective results suggested a role of antimalarial drugs (chloroquine and hydroxychloroquine) in the treatment of this disease with best available data showing value of adding azithromycin. Based on drug repurposing studies done by our team and others, we identified the autophagy/apoptosis pathway as a major target for intervention. Based on in-silico and in-vitro models, sirolimus was identified as the drug that deserves urgent prioritization. The rational for combining sirolimus and hydroxychloroquine is explained in details in the study background below and a short video prepared by study PI (https://youtu.be/-zlOMXJp2hg). The evidence for using sirolimus for influenza is emphasized by a RCT that showed reduction of mechanical ventilation time by 50% (7 days on sirolimus arm vs 15 days on oseltamivir/steroids arm). Safe administration in human subjects is illustrated by multiple phase I/II clinical trials, performed in patients with cancer. COVID19-HOPE trial will randomize patients to 2 arms: HCQ/AZ (Arm A) and HCQ/SIR (Arm B). The main inclusion criteria is an RT-PCR test confirming infection with SARS-CoV-2 along with objective clinical criteria of disease (fever, tachypnea and/or hypoxemia). The primary endpoint of study will be Time To Clinical Improvement (TTCI), defined as time from randomization to resolution of the clinical features mentioned above (no fever, no tachypnea and no hypoxemia). In addition, secondary endpoints will include clinical failure by day 28 (need for intubation and/or death), QT interval prolongation, and adverse events. The estimated NNT based on Wilcoxon Mann Whitney comparison of TTCI in study arms is 58 patients (29 each arm). The study includes an adaptive plan, meaning that after different time points the study results will be evaluated and the NNT and randomization scheme (1:1 vs. others) will be evaluated and submitted to the IRB. Also, if one arm proves to be of no value, another regimen might be introduced based on available data. The study will recruit patients for a year and once approved by IRB and JFDA attempts to recruit other centers will be made (including national and regional centers).
Observational cohort study to assess the effects of COVID19 on pediatric cancer care in Egypt and the Arab World through a survey applied to pediatric oncologists who will be interviewed either directly or through the internet to assess the effect of COVID 19 on pediatric cancer care
Background. Angiotensing converting enzyme type 2 (ACE2), a key enzyme of the renin-angiotensin-aldosterone system (RAAS), is the receptor of SARS-CoV-2 for cell entry into lungs. Because ACE2 may be modulated by RAAS inhibitors, such as angiotensin converting enzyme inhibitors (ACEi) and angiotensin II receptor blockers (ARBs), there is concern that patients treated with ACEi and ARBs may be at higher risk for COVID-19 infection and severity. Aim. To analyze the associations between COVID-19 and hypertension, and treatments with ACEi and ARBs. Methods. In this retrospective observational study, consecutive patients hospitalized for suspected COVID-19 pneumonia will be divided into 2 groups, whether or not COVID-19 is confirmed. The two groups will be compared for baseline characteristics, mainly prior treatment with ACEi and ARBs, and clinical outcome at 1-month follow-up. The main hypothesis is that ACEi and ARBs, which interact differently with ACE2, may have different relationships with COVID-19 infection or severity.
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly identified, highly contagious RNA virus causing respiratory infectious disease, Coronavirus Disease 2019 (COVID-19). Conjunctivitis has been reported as a rare finding of the disease, and preliminary studies showed that the virus RNA could be detected in ocular secretions using polymerase chain reaction (PCR) assays when conjunctivitis present. This study aims to estimate the proportion of SARS-CoV-2 associated conjunctivitis among patients with suspected viral conjunctivitis presented to the ophthalmology clinics of Wilmer Eye Institute during the COVID-19 pandemic. The investigators also aim to identify whether SARS-CoV-2 associated conjunctivitis is an isolated finding or an early sign of COVID-19.
Quarantine is an unpleasant experience : separation from loved ones, loss of freedom, uncertainty about infection status, boredom. It may lead to negative mental health consequences and thus the emergence of anxiety and depressive symptoms. From March 17th, 2020 to May 11th 2002, the French government has implemented national containment measures due to the Covid-19 epidemic. Although there are data on the psychological impact and experience of quarantine measures in people who have been infected or suspected of being carriers of certain pathogens (e.g. Ebola), there are no data on such impact in the French population and quarantines lasting longer than 21 days. Investigators therefore propose to conduct a human and social sciences study in order to better understand the current situation
Severe COVID-19 patients at a high risk of venous thromboembolism. We studied patients in 2 intensive care units of university hospitals in Barcelona and Badalona, Spain. We performed a cut-off screening of deep venous thrombosis (DVT) with bilateral duplex ultrasound to 230 patients.
To report the possible role of S.B 8.4% in the treatment of COVID-19pneumonia.
This is a single arm phase II trial to assess efficacy and confirm safety of infusions of anti-SARS-CoV-2 convalescent plasma in hospitalized patients with acute respiratory symptoms,with or without confirmed interstitial COVID-19 pneumonia by chest Xray or CT. A total of 29 eligible subjects will be enrolled to receive anti-SARS-CoV-2 plasma.Outcomes will be compared to hospitalized controls with confirmed COVID-19 disease through retrospective chart review.
Older age is an independent poor outcome predictor among COVID-19 hospitalized patients . Among 72,314 COVID-19 cases, case fatality rate (CFR) was 2.3% in total population, 8% in people aged 70 to 79, and 14.8% in those aged 80 and older. In the whole population, CFR was higher in people with comorbidities, ranging from 5-6% in persons with hypertension, chronic respiratory disease, diabetes or cancer, up to 10% in those with cardiovascular diseases. Sars-CoV-2 seems to be able to induce a functional exhaustion of specified T and NK lymphocyte subpopulations, breaking down antiviral immunity. One possible explanation is that the immune system of elderly people, might be exhausted by chronic stimulation associated with comorbidities and more susceptible to this Sars-CoV-2 effect. As a result, in these patients, the activation of the innate immune system might fail to produce an adequate adaptive response (i.e., virus-specific CD8+ T-cells). This results in persistent self-induced inflammation that eventually causes mortality. The investigators hypothesize that transfusing convalescent plasma (containing neutralizing antibodies) at an early phase of COVID-19 infection could prevent or switch off the persistent inflammatory response elicited by the virus. The objective of this study are: - To demonstrate the superiority of COVID-19 convalescent plasma (CCP) plus standard therapy (ST) over ST alone - To prevent progression of pneumonia in COVID-19 patients aged ≥65 with chronic comorbidities - To decrease viral load - To raise anti-SARS-CoV-2 antibody titer in recipients