This project paper is to give a prediction for the future of other viral pandemics and to provide recommendations for preparing therapies that could help in the success of effective treatments and benefits for patient...This project paper is to give a prediction for the future of other viral pandemics and to provide recommendations for preparing therapies that could help in the success of effective treatments and benefits for patients in life-threatening situations. The theory of prediction was proposed by Huu S. TIEU on March 25, 2019, and he hypothesized that any malfunctioning cell in the body could have a damaging effect. This paper discusses the prediction that Localized Oxygen Deprivation could be a contributing factor for a future epidemic or other viral pandemics that could affect body function. This paper is based on opinion and does not have sufficient evidence to support the claims made. Therefore, further in-depth study is needed to prove the findings. The author cites Hypoxia to support his idea, but he is not claiming that Hypoxia-Inducible Factor (HIF) has worked on his predictions. The author also tested a theory using cow blood curd for body function, but this test was not a structured test and the findings were not supported by other evidence. To further prove the idea or theory, further study into the subject should be conducted.展开更多
New coronavirus referred to SARS-CoV-2 has caused a worldwide pandemic(COVID-19)declared by WHO.Coronavirus disease 2019(COVID-19)is an infectious disease with severe acute respiratory syndrome caused by coronavirus-2...New coronavirus referred to SARS-CoV-2 has caused a worldwide pandemic(COVID-19)declared by WHO.Coronavirus disease 2019(COVID-19)is an infectious disease with severe acute respiratory syndrome caused by coronavirus-2(SARS-CoV-2).SARS-CoV-2 is akin to SARS-CoV,which was the causative agent of severe acute respiratory syndrome(SARS)in 2002 as well as to that of Middle East respiratory syndrome(MERS)in 2012.SARS-CoV-2 has been revealed to belong to Coronaviridiae family as a member ofβ-coronaviruses.It has a positive-sense single-stranded RNA with the largest RNA genome.Since its genomic sequence has a notable similarity to that of SARS-CoV,antiviral drugs used to treat SARS and MERS are now being also applied for COVID-19 treatment.In order to combat SARS-CoV-2,many drug and vaccine development studies at experimental and clinical levels are currently conducted worldwide.In this sense,medicinal plants and the pure natural molecules isolated from plants have been reported to exhibit significant inhibitory antiviral activity against SARS-CoV and other types of coronaviruses.In the present review,plant extracts and natural molecules with the mentioned activity are discussed in order to give inspiration to researchers to take these molecules into consideration against SARS-CoV-2.展开更多
Diabetes,as the major cause of hyperglycemia,is a chronic metabolic disease.Immune system disorders caused by diabetes can increase the risk of respiratory diseases.Thus,diabetes is considered to be a major risk facto...Diabetes,as the major cause of hyperglycemia,is a chronic metabolic disease.Immune system disorders caused by diabetes can increase the risk of respiratory diseases.Thus,diabetes is considered to be a major risk factor for viral respiratory infections such as coronavirus infections.Coronaviruses are members of the Coronaviridae,which has caused three outbreaks from 2003 to 2020.Patients with coronavirus infection in the lower and upper respiratory tract could show mild to severe symptoms.In this review,we focus on the relationship between diabetes and three coronaviruses:SARS-CoV,MERS-CoV,and SARS-CoV-2.展开更多
The synonymous codon usage in the translational initiation and termination regions of genes of severe acute respiratory syndrome (SARS) coronavirus and five other viruses in Coronaviridae was systematically analyzed.T...The synonymous codon usage in the translational initiation and termination regions of genes of severe acute respiratory syndrome (SARS) coronavirus and five other viruses in Coronaviridae was systematically analyzed.The results indicate that most minor codons for these coronaviruses are preferentially used in the initial and terminal region.The minor codons preferentially used in the initial region are thought to have a negative effect on gene expression,which can be explained by the minor codon modulator hypothesis.It also indicates that the minor codons preferentially used in the terminal region may regulate the level of gene expression.The proposed results strongly imply that the minor codon modulator hypothesis can be applied to both some bacteria and some viruses.展开更多
The coronavirus disease 2019(COVID-19)pandemic caused by the novel beta coronavirus severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)crippled the whole world and has resulted in large number of morbidity and...The coronavirus disease 2019(COVID-19)pandemic caused by the novel beta coronavirus severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)crippled the whole world and has resulted in large number of morbidity and mortality.The origin of the SARS-CoV-2 is still disputed.The risk of infection with SARS-CoV-2 is dependent on several risk factors as observed in many studies.The severity of the disease depends on many factors including the viral strain,host immunogenetics,environmental factors,host genetics,host nutritional status and presence of comorbidities like hypertension,diabetes,Chronic Obstructive Pulmonary Disease,cardiovascular disease,renal impairment.Diabetes is a metabolic disorder mainly characterized by hyperglycemia.Diabetic individuals are intrinsically prone to infections.SARS-CoV-2 infection in patients with diabetes result inβ-cell damage and cytokine storm.Damage to the cells impairs the equilibrium of glucose,leading to hyperglycemia.The ensuing cytokine storm causes insulin resistance,especially in the muscles and liver,which also causes a hyperglycemic state.All of these increase the severity of COVID-19.Genetics also play pivotal role in disease pathogenesis.This review article focuses from the probable sources of coronaviruses and SARS-CoV-2 to its impacts on individuals with diabetes and host genetics in pre-and post-pandemic era.展开更多
While severe acute respiratory syndrome coronavirus （SARS-CoV）~as initially thought to enter cells through direct fusion with the plasma membrane, more recent evidence suggests that yirus entry may also involve endo...While severe acute respiratory syndrome coronavirus （SARS-CoV）~as initially thought to enter cells through direct fusion with the plasma membrane, more recent evidence suggests that yirus entry may also involve endocytosis. We have found that SARS-CoV enters cells viapH- and receptor-dependent endocytosis. Treatment of cells with either SARS-COV spike protein or spike-bearing pseudoviruses resulted in the translocation of angiotensin-converting enzyme 2 （ACE2）, the functional receptor of SARS-CoV, from the cell surface to endosomes. In addition, the spike-bearing pseudoviruses and early endosome antigen 1 were found to colocalize in endosomes. Further analyses using specific endocytic path- way inhibitors and dominant-negative Epsl5 as well as caveolin-1 colocalization study suggested that virus entry was mediated by a clathrin- and caveolae-independent mechanism. Moreover, cholesterol- and sphingolipid-rich lipid raft microdomains in the plasma membrane, which have been shown to act as platforms for many physiological signaling pathways, were shown to be involved in virus entry. Endocytic entry of SARS-CoV may expand the cellular range of SARS-CoV infection, and our findings here contribute to the understanding of SARS-CoV pathogenesis, providing new information for anti-viral drug research.展开更多
A group of SARS-like coronaviruses(SL-CoV)have been identified in horseshoe bats.Despite SL-CoVs and SARS-CoV share identical genome structure and high-level sequence similarity,SL-CoV does not bind to the same cellul...A group of SARS-like coronaviruses(SL-CoV)have been identified in horseshoe bats.Despite SL-CoVs and SARS-CoV share identical genome structure and high-level sequence similarity,SL-CoV does not bind to the same cellular receptor as for SARS-CoV and the N-terminus of the S proteins only share 64%amino acid identity,suggesting there are fundamental differences between these two groups of coronaviruses.To gain insight into the basis of this difference,we established a recombinant adenovirus system expressing the S protein from SL-CoV(rAd-Rp3-S)to investigate its immune characterization.Our results showed that immunized mice generated strong humoral immune responses against the SL-CoV S protein.Moreover,a strong cellular immune response demonstrated by elevated IFN-γand IL-6 levels was also observed in these mice.However,the induced antibody from these mice had weaker cross-reaction with the SARS-CoV S protein,and did not neutralize HIV pseudotyped with SARS-CoV S protein.These results demonstrated that the immunogenicity of the SL-CoV S protein is distinct from that of SARS-CoV,which may cause the immunological differences between human SARS-CoV and bat SL-CoV.Furthermore,the recombinant virus could serve as a potential vaccine candidate against bat SL-CoV infection.展开更多
In this paper, we report a multiple sequence alignment result on the basis of 10 amino acid sequences of the M protein, which come from different coronaviruses (4 SARS associated and 6 others known). The alignment mo...In this paper, we report a multiple sequence alignment result on the basis of 10 amino acid sequences of the M protein, which come from different coronaviruses (4 SARS associated and 6 others known). The alignment model was based on the profile HMM (Hidden Markov Model), and the model training was implemented through the SAHMM (Self Adapting Hidden Markov Model) software developed by the authors.展开更多
To evaluate the immunogenicity of inactivated SARS coronavirus(SARS-CoV),three groups of rabbits were immunized three times at 2-week intervals with inactivated vaccine + adjuvant,adjuvant,and normal saline respective...To evaluate the immunogenicity of inactivated SARS coronavirus(SARS-CoV),three groups of rabbits were immunized three times at 2-week intervals with inactivated vaccine + adjuvant,adjuvant,and normal saline respectively.Eight batchs of serum were sampled from the auricular vein at day 7 to day 51,and specific IgG antibody titers and neutralizing antibody titers were detected by indirect ELISA and micro-cytopathic effect neutralizing test.Antibody specificity was identified by proteinchip assay.Histopathological changes were detected by H&E staining.The results showed that,rabbits in the experimental group immunized with inactivated SARS-CoV all generated specific IgG antibodies with neutralizing activity,which suggested the inactivated SARS-CoV could preserve its antigenicity well and elicit an effective humoral immune responses.The peak titer value of specific IgG antibody and neutralizing antibody reached 1:40960 and 1:2560 respectively.In the experimental group,no obvious histopathological changes was detected in the H&E stained slides of heart,spleen,kidney and testis samples,but the livers had slight histopathological changes,and the lungs presented remarkable histopathological changes.These findings are of importance for SARS-CoV inactivated vaccine development.展开更多
文摘This project paper is to give a prediction for the future of other viral pandemics and to provide recommendations for preparing therapies that could help in the success of effective treatments and benefits for patients in life-threatening situations. The theory of prediction was proposed by Huu S. TIEU on March 25, 2019, and he hypothesized that any malfunctioning cell in the body could have a damaging effect. This paper discusses the prediction that Localized Oxygen Deprivation could be a contributing factor for a future epidemic or other viral pandemics that could affect body function. This paper is based on opinion and does not have sufficient evidence to support the claims made. Therefore, further in-depth study is needed to prove the findings. The author cites Hypoxia to support his idea, but he is not claiming that Hypoxia-Inducible Factor (HIF) has worked on his predictions. The author also tested a theory using cow blood curd for body function, but this test was not a structured test and the findings were not supported by other evidence. To further prove the idea or theory, further study into the subject should be conducted.
文摘New coronavirus referred to SARS-CoV-2 has caused a worldwide pandemic(COVID-19)declared by WHO.Coronavirus disease 2019(COVID-19)is an infectious disease with severe acute respiratory syndrome caused by coronavirus-2(SARS-CoV-2).SARS-CoV-2 is akin to SARS-CoV,which was the causative agent of severe acute respiratory syndrome(SARS)in 2002 as well as to that of Middle East respiratory syndrome(MERS)in 2012.SARS-CoV-2 has been revealed to belong to Coronaviridiae family as a member ofβ-coronaviruses.It has a positive-sense single-stranded RNA with the largest RNA genome.Since its genomic sequence has a notable similarity to that of SARS-CoV,antiviral drugs used to treat SARS and MERS are now being also applied for COVID-19 treatment.In order to combat SARS-CoV-2,many drug and vaccine development studies at experimental and clinical levels are currently conducted worldwide.In this sense,medicinal plants and the pure natural molecules isolated from plants have been reported to exhibit significant inhibitory antiviral activity against SARS-CoV and other types of coronaviruses.In the present review,plant extracts and natural molecules with the mentioned activity are discussed in order to give inspiration to researchers to take these molecules into consideration against SARS-CoV-2.
文摘Diabetes,as the major cause of hyperglycemia,is a chronic metabolic disease.Immune system disorders caused by diabetes can increase the risk of respiratory diseases.Thus,diabetes is considered to be a major risk factor for viral respiratory infections such as coronavirus infections.Coronaviruses are members of the Coronaviridae,which has caused three outbreaks from 2003 to 2020.Patients with coronavirus infection in the lower and upper respiratory tract could show mild to severe symptoms.In this review,we focus on the relationship between diabetes and three coronaviruses:SARS-CoV,MERS-CoV,and SARS-CoV-2.
文摘The synonymous codon usage in the translational initiation and termination regions of genes of severe acute respiratory syndrome (SARS) coronavirus and five other viruses in Coronaviridae was systematically analyzed.The results indicate that most minor codons for these coronaviruses are preferentially used in the initial and terminal region.The minor codons preferentially used in the initial region are thought to have a negative effect on gene expression,which can be explained by the minor codon modulator hypothesis.It also indicates that the minor codons preferentially used in the terminal region may regulate the level of gene expression.The proposed results strongly imply that the minor codon modulator hypothesis can be applied to both some bacteria and some viruses.
文摘The coronavirus disease 2019(COVID-19)pandemic caused by the novel beta coronavirus severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)crippled the whole world and has resulted in large number of morbidity and mortality.The origin of the SARS-CoV-2 is still disputed.The risk of infection with SARS-CoV-2 is dependent on several risk factors as observed in many studies.The severity of the disease depends on many factors including the viral strain,host immunogenetics,environmental factors,host genetics,host nutritional status and presence of comorbidities like hypertension,diabetes,Chronic Obstructive Pulmonary Disease,cardiovascular disease,renal impairment.Diabetes is a metabolic disorder mainly characterized by hyperglycemia.Diabetic individuals are intrinsically prone to infections.SARS-CoV-2 infection in patients with diabetes result inβ-cell damage and cytokine storm.Damage to the cells impairs the equilibrium of glucose,leading to hyperglycemia.The ensuing cytokine storm causes insulin resistance,especially in the muscles and liver,which also causes a hyperglycemic state.All of these increase the severity of COVID-19.Genetics also play pivotal role in disease pathogenesis.This review article focuses from the probable sources of coronaviruses and SARS-CoV-2 to its impacts on individuals with diabetes and host genetics in pre-and post-pandemic era.
文摘While severe acute respiratory syndrome coronavirus （SARS-CoV）~as initially thought to enter cells through direct fusion with the plasma membrane, more recent evidence suggests that yirus entry may also involve endocytosis. We have found that SARS-CoV enters cells viapH- and receptor-dependent endocytosis. Treatment of cells with either SARS-COV spike protein or spike-bearing pseudoviruses resulted in the translocation of angiotensin-converting enzyme 2 （ACE2）, the functional receptor of SARS-CoV, from the cell surface to endosomes. In addition, the spike-bearing pseudoviruses and early endosome antigen 1 were found to colocalize in endosomes. Further analyses using specific endocytic path- way inhibitors and dominant-negative Epsl5 as well as caveolin-1 colocalization study suggested that virus entry was mediated by a clathrin- and caveolae-independent mechanism. Moreover, cholesterol- and sphingolipid-rich lipid raft microdomains in the plasma membrane, which have been shown to act as platforms for many physiological signaling pathways, were shown to be involved in virus entry. Endocytic entry of SARS-CoV may expand the cellular range of SARS-CoV infection, and our findings here contribute to the understanding of SARS-CoV pathogenesis, providing new information for anti-viral drug research.
基金supported by the State Key Program for Basic Research Grant(2005CB523004)from the Chinese Ministry of Science and Technologythe Knowledge Innovation Program Key Project administered by the Chinese Academy of Sciences(KSCX1-YW-R-07)
文摘A group of SARS-like coronaviruses(SL-CoV)have been identified in horseshoe bats.Despite SL-CoVs and SARS-CoV share identical genome structure and high-level sequence similarity,SL-CoV does not bind to the same cellular receptor as for SARS-CoV and the N-terminus of the S proteins only share 64%amino acid identity,suggesting there are fundamental differences between these two groups of coronaviruses.To gain insight into the basis of this difference,we established a recombinant adenovirus system expressing the S protein from SL-CoV(rAd-Rp3-S)to investigate its immune characterization.Our results showed that immunized mice generated strong humoral immune responses against the SL-CoV S protein.Moreover,a strong cellular immune response demonstrated by elevated IFN-γand IL-6 levels was also observed in these mice.However,the induced antibody from these mice had weaker cross-reaction with the SARS-CoV S protein,and did not neutralize HIV pseudotyped with SARS-CoV S protein.These results demonstrated that the immunogenicity of the SL-CoV S protein is distinct from that of SARS-CoV,which may cause the immunological differences between human SARS-CoV and bat SL-CoV.Furthermore,the recombinant virus could serve as a potential vaccine candidate against bat SL-CoV infection.
文摘In this paper, we report a multiple sequence alignment result on the basis of 10 amino acid sequences of the M protein, which come from different coronaviruses (4 SARS associated and 6 others known). The alignment model was based on the profile HMM (Hidden Markov Model), and the model training was implemented through the SAHMM (Self Adapting Hidden Markov Model) software developed by the authors.
基金Joint funds of National Natural Science Foundation of China (U0632010)Program of Guangdong Provincial Key Lab of Bioengineering Medicine (51207026).
文摘To evaluate the immunogenicity of inactivated SARS coronavirus(SARS-CoV),three groups of rabbits were immunized three times at 2-week intervals with inactivated vaccine + adjuvant,adjuvant,and normal saline respectively.Eight batchs of serum were sampled from the auricular vein at day 7 to day 51,and specific IgG antibody titers and neutralizing antibody titers were detected by indirect ELISA and micro-cytopathic effect neutralizing test.Antibody specificity was identified by proteinchip assay.Histopathological changes were detected by H&E staining.The results showed that,rabbits in the experimental group immunized with inactivated SARS-CoV all generated specific IgG antibodies with neutralizing activity,which suggested the inactivated SARS-CoV could preserve its antigenicity well and elicit an effective humoral immune responses.The peak titer value of specific IgG antibody and neutralizing antibody reached 1:40960 and 1:2560 respectively.In the experimental group,no obvious histopathological changes was detected in the H&E stained slides of heart,spleen,kidney and testis samples,but the livers had slight histopathological changes,and the lungs presented remarkable histopathological changes.These findings are of importance for SARS-CoV inactivated vaccine development.
