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ADE was a concern during late clinical stages of vaccine development against [[COVID-19]].<ref>{{cite journal |vauthors=Lambert PH, Ambrosino DM, Andersen SR, Baric RS, Black SB, Chen RT, Dekker CL, Didierlaurent AM, Graham BS, Martin SD, Molrine DC, Perlman S, Picard-Fraser PA, Pollard AJ, Qin C, Subbarao K, Cramer JP | display-authors = 6 |title=Consensus summary report for CEPI/BC March 12-13, 2020 meeting: Assessment of risk of disease enhancement with COVID-19 vaccines |journal=Vaccine |volume=38 |issue=31 |pages=4783–4791 |date=June 2020 |pmid=32507409 |pmc=7247514 |doi=10.1016/j.vaccine.2020.05.064}}</ref><ref>{{Cite journal |vauthors=Haynes BF, Corey L, Fernandes P, Gilbert PB, Hotez PJ, Rao S, Santos MR, Schuitemaker H, Watson M, Arvin A |date=2020-10-19 |title=Prospects for a safe COVID-19 vaccine |journal=Science Translational Medicine |volume=12 |issue=568 |pages=eabe0948 |doi=10.1126/scitranslmed.abe0948 |pmid=33077678 |s2cid=224809822|doi-access=free}}</ref>
ADE was a concern during late clinical stages of vaccine development against [[COVID-19]].<ref>{{cite journal |vauthors=Lambert PH, Ambrosino DM, Andersen SR, Baric RS, Black SB, Chen RT, Dekker CL, Didierlaurent AM, Graham BS, Martin SD, Molrine DC, Perlman S, Picard-Fraser PA, Pollard AJ, Qin C, Subbarao K, Cramer JP | display-authors = 6 |title=Consensus summary report for CEPI/BC March 12-13, 2020 meeting: Assessment of risk of disease enhancement with COVID-19 vaccines |journal=Vaccine |volume=38 |issue=31 |pages=4783–4791 |date=June 2020 |pmid=32507409 |pmc=7247514 |doi=10.1016/j.vaccine.2020.05.064}}</ref><ref>{{Cite journal |vauthors=Haynes BF, Corey L, Fernandes P, Gilbert PB, Hotez PJ, Rao S, Santos MR, Schuitemaker H, Watson M, Arvin A |date=2020-10-19 |title=Prospects for a safe COVID-19 vaccine |journal=Science Translational Medicine |volume=12 |issue=568 |pages=eabe0948 |doi=10.1126/scitranslmed.abe0948 |pmid=33077678 |s2cid=224809822|doi-access=free}}</ref>


ADE was observed in animal studies during the development of coronavirus vaccines, and evidence is emerging that ADE can result in the vaccine causing Covid among humans. "The researchers propose that their results prove that SARS-CoV-2 infection induces antibodies that can cause ADE-induced infection"<ref>{{cite web |date=30 September 2021 |title=SARS-CoV-2 infection aided by antibody-dependent enhancement |url=https://www.news-medical.net/news/20210930/SARS-CoV-2-infection-aided-by-antibody-dependent-enhancement.aspx/ |publisher=News Medical Life Sciences |type=Fact check |access-date=02 October 2021}}</ref>
ADE was observed in animal studies during the development of coronavirus vaccines, but {{asof|lc=yes|2020|12|14}} no incidents had been observed in human trials. "Overall, while ADE is a theoretical possibility with a COVID-19 vaccine, clinical trials in people so far have not shown that participants who received the vaccine have a higher rate of severe illness compared to participants who did not receive the vaccine."<ref>{{cite web |date=27 November 2020 |editor=Teoh F |title=No evidence that COVID-19 vaccines cause more severe disease; antibody-dependent enhancement has not been observed in clinical trials |url=https://healthfeedback.org/claimreview/no-evidence-that-covid-19-vaccines-cause-more-severe-disease-antibody-dependent-enhancement-has-not-been-observed-in-clinical-trials/ |publisher=Health Feedback |type=Fact check |access-date=2 January 2021 |archive-date=4 February 2021 |archive-url=https://web.archive.org/web/20210204065329/https://healthfeedback.org/claimreview/no-evidence-that-covid-19-vaccines-cause-more-severe-disease-antibody-dependent-enhancement-has-not-been-observed-in-clinical-trials/ |url-status=live }}</ref><ref name="sbm">{{cite web |author=Gorski DH |date=14 December 2020 |title=It was inevitable that antivaxxers would claim that COVID-19 vaccines make females infertile |url=https://sciencebasedmedicine.org/it-was-inevitable-that-antivaxxers-would-claim-that-covid-19-vaccines-make-females-infertile/ |publisher=[[Science-Based Medicine]] |quote=the overall petition ... spends far more verbiage on PCR, Sanger sequencing, and the not-unreasonable but thus far not observed concern about antibody-dependent enhancement (ADE) due to a vaccine |access-date=19 December 2020 |archive-date=9 February 2021 |archive-url=https://web.archive.org/web/20210209003222/https://sciencebasedmedicine.org/it-was-inevitable-that-antivaxxers-would-claim-that-covid-19-vaccines-make-females-infertile/ |url-status=live }}</ref>


== Influenza ==
== Influenza ==

Revision as of 20:59, 2 October 2021

"Immune enhancement" redirects here. For immune enhancement in another sense, see autologous immune enhancement therapy.

In antibody-dependent enhancement, sub-optimal antibodies (the blue Y-shaped structures in the graphic) bind to both viruses and Fc gamma receptors (labeled FcγRII) expressed on immune cells promoting infection of these cells.

Antibody-dependent enhancement (ADE), sometimes less precisely called immune enhancement or disease enhancement, is a phenomenon in which binding of a virus to suboptimal antibodies enhances its entry into host cells, followed by its replication.[1][2] The suboptimal antibodies can result from natural infection or from vaccination. ADE may cause enhanced respiratory disease and acute lung injury after respiratory virus infection (ERD) with symptoms of monocytic infiltration and an excess of eosinophils in respiratory tract.[3] ADE along with type 2 T helper cell-dependent mechanisms may contribute to a development of the vaccine associated disease enhancement (VADE), which is not limited to respiratory disease.[3] Some vaccine candidates that targeted coronaviruses, RSV virus and Dengue virus elicited VADE, and were terminated from further development or became approved for use only for patients who had those viruses before.

Technical description

Antiviral antibodies promote viral infection of target immune cells by exploiting the phagocytic FcγR or complement pathway.[4] After interaction with the virus the antibody binds Fc receptors (FcR) expressed on certain immune cells or some of the complement proteins. FcγR binds antibody via its fragment crystallizable region (Fc). Usually the process of phagocytosis is accompanied by the virus degradation, however, if the virus is not neutralized (either due to low affinity binding or targeting to a non-neutralizing epitope), antibody binding might result in a virus escape and therefore, enhanced infection. Thus, phagocytosis can cause viral replication, with the subsequent death of immune cells. The virus “deceives” the process of phagocytosis of immune cells and uses the host's antibodies as a Trojan horse. ADE may occur because of the non-neutralizing characteristic of the antibody, which binds viral epitopes other than those involved in host-cell attachment and entry. ADE may also happen because the antibodies are present at sub-neutralizing concentrations (yielding occupancies on viral epitopes below the threshold for neutralization).[5][6] In addition ADE can be induced when the strength of antibody-antigen interaction is below the certain threshold.[7][8] This phenomenon might lead to both increased virus infectivity and virulence. The viruses that can cause ADE frequently share some common features such as antigenic diversity, abilities to replicate and establish persistence in immune cells.[1] ADE can occur during the development of a primary or secondary viral infection, as well as after vaccination with a subsequent virus challenge.[1][9][10] It has been observed mainly with positive-strand RNA viruses. Among them are Flaviviruses such as Dengue virus,[11] Yellow fever virus, Zika virus,[12][13] Coronaviruses, including alpha- and betacoronaviruses,[14] Orthomyxoviruses such as influenza,[15] Retroviruses such as HIV,[16][17][18] and Orthopneumoviruses such as RSV.[19][20][21]

The mechanism that involves phagocytosis of immune complexes via FcγRII / CD32 receptor is better understood compared to the complement receptor pathway.[22][23][24] Cells that express this receptor are represented by monocytes, macrophages, some categories of dendritic cells and B-cells. ADE is mainly mediated by IgG antibodies,[23] however, IgM along with complement,[25] and IgA antibodies[17][18] have also been shown to be trigger ADE.

Coronavirus

COVID-19

Further information: COVID-19 misinformation § Antibody-dependent enhancement

ADE was a concern during late clinical stages of vaccine development against COVID-19.[26][27]

ADE was observed in animal studies during the development of coronavirus vaccines, and evidence is emerging that ADE can result in the vaccine causing Covid among humans. "The researchers propose that their results prove that SARS-CoV-2 infection induces antibodies that can cause ADE-induced infection"[28]

Influenza

Prior receipt of 2008–09 TIV (Trivalent Inactivated Influenza Vaccine) was associated with an increased risk of medically attended pH1N1 illness during the spring-summer 2009 in Canada. The occurrence of bias (selection, information) or confounding cannot be ruled out. Further experimental and epidemiological assessment is warranted. Possible biological mechanisms and immunoepidemiologic implications are considered.[29]

Natural infection and the attenuated vaccine induce antibodies that enhance the update of the homologous virus and H1N1 virus isolated several years later, demonstrating that a primary influenza A virus infection results in the induction of infection enhancing antibodies.[30]

ADE was suspected in infections with influenza A virus subtype H7N9, but knowledge is limited.

Dengue

Further information: Dengue fever and Dengue virus

The most widely known ADE example occurs with dengue virus.[31] Dengue is a single-stranded positive-polarity RNA virus of the family Flaviviridae. It causes disease of varying severity in humans, from dengue fever (DF), which is usually self-limited, to dengue hemorrhagic fever and dengue shock syndrome, either of which may be life-threatening.[32] It is estimated that as many as 390 million individuals contract dengue annually.[33]

ADE may follow when a person who has previously been infected with one serotype becomes infected months or years later with a different serotype, producing higher viremia than in first-time infections. Accordingly, while primary (first) infections cause mostly minor disease (dengue fever) in children, re-infection is more likely to be associated with dengue hemorrhagic fever and/or dengue shock syndrome in both children and adults.[34]

Dengue encompasses four antigenically different serotypes (dengue virus 1–4).[35] In 2013 a fifth serotype was reported.[36] Infection induces the production of neutralizing homotypic immunoglobulin G (IgG) antibodies that provide lifelong immunity against the infecting serotype. Infection with dengue virus also produces some degree of cross-protective immunity against the other three serotypes.[37] Neutralizing heterotypic (cross-reactive) IgG antibodies are responsible for this cross-protective immunity, which typically persists for a period of months to a few years. These heterotypic titers decrease over long time periods (4 to 20 years).[38] While heterotypic titers decrease, homotypic IgG antibody titers increase over long time periods. This could be due to the preferential survival of long-lived memory B cells producing homotypic antibodies.[38]

In addition to neutralizing heterotypic antibodies, an infection can also induce heterotypic antibodies that neutralize the virus only partially or not at all.[39] The production of such cross-reactive, but non-neutralizing antibodies could enable severe secondary infections. By binding to but not neutralizing the virus, these antibodies cause it to behave as a "trojan horse",[40][41][42] where it is delivered into the wrong compartment of dendritic cells that have ingested the virus for destruction.[43][44] Once inside the white blood cell, the virus replicates undetected, eventually generating high virus titers and severe disease.[45]

A study conducted by Modhiran et al.[46] attempted to explain how non-neutralizing antibodies down-regulate the immune response in the host cell through the Toll-like receptor signaling pathway. Toll-like receptors are known to recognize extra- and intracellular viral particles and to be a major basis of the cytokines' production. In vitro experiments showed that the inflammatory cytokines and type 1 interferon production were reduced when the ADE-dengue virus complex bound to the Fc receptor of THP-1 cells. This can be explained by both a decrease of Toll-like receptor production and a modification of its signaling pathway. On the one hand, an unknown protein induced by the stimulated Fc receptor reduces Toll-like receptor transcription and translation, which reduces the capacity of the cell to detect viral proteins. On the other hand, many proteins (TRIF, TRAF6, TRAM, TIRAP, IKKα, TAB1, TAB2, NF-κB complex) involved in the Toll-like receptor signaling pathway are down-regulated, which led to a decrease in cytokine production. Two of them, TRIF and TRAF6, are respectively down-regulated by 2 proteins SARM and TANK up-regulated by the stimulated Fc receptors.

One example occurred in Cuba, lasting from 1977 to 1979. The infecting serotype was dengue virus-1. This epidemic was followed by outbreaks in 1981 and 1997. In those outbreaks; dengue virus-2 was the infecting serotype. 205 cases of dengue hemorrhagic fever and dengue shock syndrome occurred during the 1997 outbreak, all in people older than 15 years. All but three of these cases were demonstrated to have been previously infected by dengue virus-1 during the first outbreak.[47] Furthermore, people with secondary infections with dengue virus-2 in 1997 had a 3-4 fold increased probability of developing severe disease than those with secondary infections with dengue virus-2 in 1981.[38] This scenario can be explained by the presence of sufficient neutralizing heterotypic IgG antibodies in 1981, whose titers had decreased by 1997 to the point where they no longer provided significant cross-protective immunity.

HIV-1

ADE of infection has also been reported in HIV. Like dengue virus, non-neutralizing level of antibodies have been found to enhance the viral infection through interactions of the complement system and receptors.[48] The increase in infection has been reported to be over 350 fold which is comparable to ADE in other viruses like dengue virus.[48] ADE in HIV can be complement-mediated or Fc receptor-mediated. Complements in the presence of HIV-1 positive sera have been found to enhance the infection of the MT-2 T-cell line. The Fc-receptor mediated enhancement was reported when HIV infection was enhanced by sera from HIV-1 positive guinea pig enhanced the infection of peripheral blood mononuclear cells without the presence of any complements.[49] Complement component receptors CR2, CR3 and CR4 have been found to mediate this Complement-mediated enhancement of infection.[48][50] The infection of HIV-1 leads to activation of complements. Fragments of these complements can assist viruses with infection by facilitating viral interactions with host cells that express complement receptors.[51] The deposition of complement on the virus brings the gp120 protein close to CD4 molecules on the surface of the cells, thus leading to facilitated viral entry.[51] Viruses pre-exposed to non-neutralizing complement system have also been found to enhance infections in interdigitating dendritic cells. Opsonized viruses have not only shown enhanced entry but also favorable signaling cascades for HIV replication in interdigitating dendritic cells.[52]

HIV-1 has also shown enhancement of infection in HT-29 cells when the viruses were pre-opsonized with complements C3 and C9 in seminal fluid. This enhanced rate of infection was almost 2 times greater than infection of HT-29 cells with the virus alone.[53] Subramanian et al., reported that almost 72% of serum samples out of 39 HIV-positive individuals contained complements that were known to enhance the infection. They also suggested that the presence of neutralizing antibody or antibody-dependent cellular cytotoxicity-mediating antibodies in the serum contains infection-enhancing antibodies.[54] The balance between the neutralizing antibodies and infection-enhancing antibodies changes as the disease progresses. During advanced stages of the disease, the proportion of infection-enhancing antibodies are generally higher than neutralizing antibodies.[55] Increase in viral protein synthesis and RNA production have been reported to occur during the complement-mediated enhancement of infection. Cells that are challenged with non-neutralizing levels of complements have been found to have accelerated release of reverse transcriptase and viral progeny.[56] The interaction of anti-HIV antibodies with non-neutralizing complement exposed viruses also aid in binding of the virus and the erythrocytes which can lead to the more efficient delivery of viruses to the immune-compromised organs.[50]

ADE in HIV has raised questions about the risk of infections to volunteers who have taken sub-neutralizing levels of vaccine just like any other viruses that exhibit ADE. Gilbert et al., in 2005 reported that there was no ADE of infection when they used the rgp120 vaccine in phase 1 and 2 trials.[57] It has been emphasized that much research needs to be done in the field of the immune response to HIV-1, information from these studies can be used to produce a more effective vaccine.

Mechanism

Interaction of a virus with antibodies must prevent the virus from attaching to the host cell entry receptors. However, instead of preventing infection of the host cell, this process can facilitate viral infection of immune cells, causing ADE.[1][4] After binding the virus, the antibody interacts with Fc or complement receptors expressed on certain immune cells. These receptors promote virus-antibody internalization by the immune cells, which should be followed by the virus destruction. However, the virus might escape the antibody complex and start its replication cycle inside the immune cell avoiding the degradation.[4][25] This happens if the virus is bound to a low-affinity antibody.

Different virus serotypes

There are several possibilities to explain the phenomenon of enhancing intracellular virus survival:

1) Antibodies against a virus of one serotype binds to a virus of a different serotype. The binding is meant to neutralize the virus from attaching to the host cell, but the virus-antibody complex also binds to the Fc-region antibody receptor (FcγR) on the immune cell. The cell internalizes the virus for programmed destruction but the virus avoids it and starts its replication cycle instead.[58]

2) Antibodies against a virus of one serotype binds to a virus of a different serotype, activating the classical pathway of the complement system. The complement cascade system binds C1Q complex attached to the virus surface protein via the antibodies, which in turn bind C1q receptor found on cells, bringing the virus and the cell close enough for a specific virus receptor to bind the virus, beginning infection.[25] This mechanism has been shown for Ebola virus in vitro[59] and some flaviviruses in vivo.[25]

Conclusion

When an antibody to a virus is unable to neutralize the virus, it forms sub-neutralizing virus-antibody complexes. Upon phagocytosis by macrophages or other immune cells, the complex may release the virus due to poor binding with the antibody. This happens during acidification and eventual fusion of the phagosome[60][61] with lysosomes.[62] The escaped virus begins its replication cycle within the cell, triggering ADE.[1][4][5]

See also

  • Original antigenic sin
  • Other ways in which antibodies can (unusually) make an infection worse instead of better
    • Blocking antibody, which can be either good or bad, depending on circumstances
    • Hook effect, most relevant to in vitro tests but known to have some in vivo relevances

References

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