Photo Deputy Governor Kei Kimura explaining the third inoculation of the new coronavirus vaccine = XNUMXth, prefectural office
"Cross-inoculation" for the third vaccine is also available in February and March.
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The prefecture said that both companies' products are mRNA vaccines, "It is reported by the national council that cross-vaccination increases the number of neutralizing antibodies that prevent infection and the degree of side reactions does not change."
On the XNUMXth, Kumamoto Prefecture said about the third inoculation of the new corona vaccine, what is the first and second vaccine after February next year ... → Continue reading
Kumamoto Daily Newspaper
The Kumamoto Nichinichi Shimbun is a local newspaper in Kumamoto. Full of information about Kumamoto such as news and sports.
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Neutralizing antibody(Chuwa Kotai,British: neutralizing antibody, NAb) IsPathogenAnd infectious particles細胞Protects cells by neutralizing their biological effects onantibodyIs.Pathogens and infectious particles lose infectivity and pathogenicity due to neutralization..Neutralizing antibodyウ イ ル ス,Intracellular bacteria,AgainstAdaptive immune system OfFluidPart of the response.Neutralizing antibodies are the surface structure of infectious particles (antigen) By specifically bindingHostPrevents interactions that can infect and destroy cells.By neutralizing antibodyImmunologyBecause the immune system eliminates infected particles before infection occursSterilization immunity(British: sterilizing immunity) Also known as.
Viral particles and intracellular bacteria utilize molecules on their surface to enter the cell of the target cell.Cell surface receptorInteracts with and invades the cellReplication cycleTo start..Neutralizing antibodies can bind to pathogens, inhibit infectivity, and block molecules required for cell entry.This is due to the static interference of antibodies against the attachment of pathogens and toxins to receptors on host cells.In the case of viral infection, neutralizing antibody (NAb)Envelope virusOf glycoproteins or non-enveloped virusesCapsid proteinCan be combined with.In addition, neutralizing antibodies can act to prevent structural changes that are often required for particles to successfully enter cells.For example, neutralizing antibodies mediate the membrane fusion required for entry into host cells.Viral protein OfStructural changeCan be prevented.In some cases, the virus cannot infect even after the antibody has dissociated.The pathogen-antibody complex is eventually taken up by macrophages and degraded..
Neutralizing antibodies are also important in neutralizing the toxic effects of bacterial toxins.An example of a neutralizing antibodyDiphtheria antitoxinAnd this isDiphtheria toxinCan neutralize the biological effects of..Neutralizing antibodies are not effective against extracellular bacteria because the binding of the antibody does not interfere with bacterial replication.Here, the immune systemOpsonization,complementOther antibodies, such as activationFeaturesKill bacteria using.
Difference between neutralizing antibody and binding antibody
Not all antibodies that bind to pathogenic particles are neutralizing antibodies.Non-neutralizing antibodies (ie, binding antibodies) specifically bind to the pathogen but do not interfere with the infectivity of the pathogen.This can be due to not binding to the proper area.The non-neutralizing antibody flagged the particle and that it was targetedImmune CellsPlays an important role in informing against.The particles are then processed and, as a result, destroyed by the mobilized immune cells...Neutralizing antibodies, on the other hand, can neutralize the biological effects of antigens without the need for immune cells.In some cases, non-neutralizing antibodies or inadequate amounts of neutralizing antibodies bound to viral particles may be utilized by several viral species to facilitate uptake into host cells. ..This mechanismAntibody-dependent enhancement of infectionKnown as. this isDengue virus,Zika virusObserved in.
AntibodiesB cellsProduced and secreted by. B cellsBone marrowWhen produced in, the gene encoding the antibody is randomGenetic recombination(V (D) J gene rearrangement), As a result, all mature B cells Ofamino acidThe array is differentantibodyTo produce.Therefore, all B cells produce antibodies that specifically bind to different antigens...The strong diversity of the antibody repertoire allows the immune system to recognize pathogens of various morphologies and sizes.At the time of infection, only antibodies that bind with high affinity to pathogenic antigens are produced.This is a single B cell cloneClonal selectionRealized by. B cellsInnate immune responseReleased from infected cells as part ofinterferonIs detected and mobilized to the infected site. B cells are just antibodies immobilized on the cell membraneB cell receptorIs presented on the cell surface. When the B cell receptor binds to a high affinity allogeneic antigen,Intracellular signal transductionCascade is triggered.In addition to binding to antigens, the immune system against pathogens細胞As part of the response, B cellsHelper T cellsProduced byCytokineIt also needs to be stimulated by. When B cells are fully activated, they proliferate rapidly.Plasma cellsDifferentiate into.The plasma cells then secrete large amounts of antigen-specific antibodies...After the first encounter with the antigen by vaccination or natural infectionImmunological memoryThis allows the neutralizing antibody to be produced more rapidly after the next exposure to the virus.
Virus neutralizing antibody avoidance
Viruses use various mechanisms to produce neutralizing antibodiesAvoidanceTo..Of the virusgenomeIs at a high rateMutationTo do.Mutations that allow the virus to evade neutralizing antibodies are selected, thereby predominant.Conversely, antibodies are in the process of immune responseAffinity maturationEvolves at the same time, thereby improving the recognition of viral particles.Conserved parts of viral proteins that play a central role in viral function are less likely to evolve over time and are therefore more vulnerable to antibody binding.However, the virus has antibodies in these areasThree-dimensionalIt has evolved specific mechanisms for access to, making it difficult to combine.Antibodies are difficult to bind to viruses with a low density of surface structural proteins.Some viral glycoproteins are N- and O-linkedGlycosIs highly glycosylated to form the so-called glycan shield.This may reduce antibody binding affinity and promote avoidance of neutralizing antibodies.HumanAIDSIs the cause ofHIV-1Utilizes both of these mechanisms.
Medical use of neutralizing antibodies
Neutralizing antibodyPassive immunityIt can be used in patients without having a healthy immune system. In the early 20th century, infected patientsAntiserumWas being injected.Antisera against infectious pathogensPolyclonal antibodyOf patients who have previously been infected and recovered, includingserumIs.This indicates that the antibody can be used as an effective treatment for viral infections and toxins...Antisera are a very crude treatment because antibodies in plasma have not been purified or standardized and plasma can be rejected by donors...It also depends on donations from recovered patients and cannot be easily scaled up.However, because serum therapy is available relatively quickly, it is still used today as the first line of defense in the event of an outbreak...Serum therapy2009 Swine Flu Global EpidemicAndWest African Ebola hemorrhagic fever epidemicAt that time, it was shown to reduce patient mortality.Also,COVID-19Is being tested as a promising treatment for..Use a mixture of antibodies obtained from a healthy personImmunoglobulin therapyTo fight infectious diseasesImmunodeficiencyorImmunosuppressionIt is administered to patients who have been treated.
Purified for more specific and robust treatmentPolyclonal antibodyorMonoclonal antibody(MAb) can be used.Polyclonal antibodies target the same pathogen, but differEpitopeA collection of antibodies that bind to.Polyclonal antibodies are obtained from human donors or animals exposed to the antigen.Antigens injected into animal donors are designed to produce neutralizing antibodies as much as possible...Polyclonal antibodyCytomegalovirus(CMV),Hepatitis B virus(HBV),Rabies virus,Measles virus,Respiratory syncytial virusHas been used as a remedy for (RSV).Diphtheria antitoxinIsDiphtheria toxinContains polyclonal antibodies against..By treating with an antibody that binds a plurality of epitopes, a therapeutic effect is exhibited even when the virus is mutated and one of the epitopes changes its structure.However, treatment using polyclonal antibodies is convenient for production reasons.とThere is a problem that is low.Monoclonal antibodies, on the other hand, all bind to the same epitope with high specificity.These antibodies allow mass production of mAbsHybridoma technologyCan be produced in..MAbs for infectious diseases cease to function if the virus mutates the target epitope of the mAb or if multiple strains are in circulation.An example of a drug that uses a monoclonal antibody is against Ebola.ZMap, Against RSVPalivizumaband so on..Many mAbs for other infections are in clinical trials.
Neutralizing antibodyVaccinationIt also plays a role in active immunization by.Understanding the binding site and structure of neutralizing antibodies in the innate immune response can rationally design vaccines to stimulate the immune system to produce neutralizing antibodies rather than binding antibodies...Introducing a virus weakened by vaccinationB cellsAllows the production of neutralizing antibodies. After the second exposure, it produces virus-specific antibodiesMemory B cellsThe presence of is a faster neutralizing antibody reaction.Effective vaccines induce the production of antibodies that can neutralize most of the viral variants, but viral mutations that result in antibody evasion require the vaccine to be updated accordingly...Some viruses evolve faster than others, so vaccines need to be updated accordingly.As a well-known exampleinfluenzaThere is a virus vaccine.This should be updated annually taking into account the recent circulating strains of the virus.
Neutralizing antibodyMultiple sclerosisMay also be useful in treating..This type of antibodyRetro virusAbility to fight infections, but in some cases given into the body to treat multiple sclerosisMedicineTo attack.Recombinant protein preparations, especially animal-derived medicines, are generally targeted by neutralizing antibodies.Examples include Rebif, Betaseron, and Avonex.
Methods for Detection and Quantification of Neutralizing Antibodies
Neutralization assay (test)(Compare the number of viral plaques in the control well with the number of inoculated cultures), microneutralized (filled with a small amount of serum)Microtiter plateDo it in), andColorimetric assay(Depends on biomarkers that indicate viral metabolism inhibition) It can be implemented and measured in a variety of ways, including the use of techniques such as.
Widespread neutralizing antibody
Many of the neutralizing antibodies produced by the immune system are highly specific for a single viral strain due to affinity maturation by B cells... Some highly genetically variable pathogens, such as HIV, constantly alter their surface structure so that neutralizing antibodies with high specificity to the old strain cannot bind to the new viral strain.Such immune avoidance strategies prevent the immune system from developing immunological memory for pathogens...Widespread neutralizing antibodies (bNAbs), on the other hand, have the special ability to bind and neutralize multiple strains of viral species..
bNAb was initially discovered in HIV patients..However, bNAb is a very rare entity.on-siteScreening studies (intra-living organisms) showed that only 1% of all patients develop bNAb against HIV... bNAb can neutralize a wide range of viral strains by binding to conserved regions of viral surface proteins (which cannot be mutated because they are functionally essential for viral replication). Most binding sites for bNAb to HIV are the envelope (Env) protein, which is the exposed surface antigen of HIV.gp120andgp41It is on a trimer consisting of subunits).These sites include the CD4 binding site or the gp41-gp120 interface..Los Alamos National LaboratoryHIV Database is a comprehensive resource with a wealth of information on HIV sequences, bNAbs and more..
Preliminary studies are underway to identify and test bNAb against HIV-1.. bNAb is used in rationally designed vaccine studies to stimulate bNAb production and boost immunity to the virus.No known antigens that induce bNAb production in animal models or humans.
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