HCV vaccines—back to the future?
Editorial

HCV vaccines—back to the future?

Paul Klenerman

Peter Medawar Building for Pathogen Research and Translational Gastroenterology Unit, University of Oxford, Oxford OX1 3SY, UK

Correspondence to: Paul Klenerman. Peter Medawar Building for Pathogen Research and Translational Gastroenterology Unit, University of Oxford, South Parks Rd., Oxford OX1 3SY, UK. Email: paul.klenerman@ndm.ox.ac.uk.

Comment on: Yokokawa H, Higashino A, Suzuki S, et al. Induction of humoural and cellular immunity by immunisation with HCV particle vaccine in a non-human primate model. Gut 2016. [Epub ahead of print].


Received: 12 February 2017; Accepted: 28 February 2017; Published: 16 March 2017.

doi: 10.21037/aob.2017.02.01


HCV is a huge global problem. Major advances have been made in recent years in the drug therapy for chronic HCV infection (1). If patients have access to such directly acting antiviral agents, there is a very high chance of cure in most settings, even in patients with advanced disease or with previous treatment failures. However, in order to effectively get on top of the epidemic, such therapy is likely only one weapon, as there is still a substantial amount of ongoing transmission and undiagnosed disease, often in populations that are hard to reach. Virologic cure through the new agents does not lead to host immunity, so approaches to prevention of new or repeat infections are still needed. For this reason, a vaccine for HCV still has an important place at the table (2,3).

The classical approach to vaccines has been to use either a live strain with attenuated pathogenicity—as in the case of smallpox vaccine—or to use a killed or inactivated vaccine. Both approaches have been very effective. Live strains—such as the yellow fever vaccine—produce long lasting immunity, and combine typically cellular immunity with humoral responses. While this is advantageous, for many pathogens there is no clear way of safely attenuating the virus, so the risks outweigh the benefits. Inactivated vaccines, for example the Salk polio vaccine, similar to the toxoids used for tetanus, induce a strong antibody response, although the induction of cytotoxic T cells is limited. In the end, the efficacy of the vaccine depends on the dominant form of protection. In the case of HBV vaccines, a recombinant protein approach is highly effective, as the levels of antibody generated are sufficient to provide robust immunity (4). Recombinant protein approaches mimic the killed vaccines in providing a non-replicating antigen, together with sufficient adjuvant to activate the innate immune responses needed for immunologic priming. For HBV the field is relatively well off as the antibodies represent a clear “correlate of protection”—i.e., their presence predicts efficacy (4). Unfortunately, we do not have very well defined correlates of protection in HCV infection, although there is a wealth of data that innate and adaptive immune responses are important, including a role for T cells. This includes studies of animal models, host immunogenetics, viral evolution and numerous correlative studies in acute and chronic disease, as well as challenge studies (5-7).

For HCV, there have been limited attempts to date to develop preventive vaccines, compared for example to HIV, and there are no simple live-attenuated avenues to explore (3,8,9). HCV is persistent, highly mutable, and difficult to grow in culture. It is also in many patients a relatively poor inducer of immune responses, partly because of its hepatotropism. In common with other complex infections such as HIV and malaria, a viral vector approach has been taken by a few groups, using HCV antigens expressed in the context of another virus, such as a poxvirus or adenovirus. This allows the immunogen to be presented in an optimal form to generate cellular immune responses, and in humans, adenoviral vectors have been shown to be quite effective at priming both CD4+ and CD8+ T cell responses (10,11). Currently a preventive HCV vaccine based on priming with a chimpanzee adenoviral vector expressing HCV non-structural proteins 3-5B, and boosting with a modified vaccinia Ankara (MVA) vector expressing the same proteins is in phase 2 trials in the USA (https://clinicaltrials.gov/ct2/show/NCT01436357).

Antibodies also have a role to play in protection against HCV, and in an ideal world a vaccine that induced a high-titre antibody response capable of blocking infection of a wide range of HCV strains—so-called broadly neutralising antibody (bNAbs)—would be very effective. Attempts have been made to generate antibodies using recombinant HCV envelope proteins, and bNAbs have been generated with this approach (12,13). However, high level production of these protein targets is not trivial and so this area is still open for development, including attempts to focus the antibody response on targets within envelope which are highly conserved and block infection (14).

On this background the recent study by Yokokama et al. in Gut is of interest as it combines new and old approaches to try and induce protective immunity against HCV (15). While it is not possible to routinely culture HCV, certain strains—notably JFH, first generated by Wakita, a co-author on the current study—can replicate in specific cell lines, and this technology has been further developed to allow different genotypes to be cultured (16). The authors were able to make high level stocks of a cell culture strain (HCVcc), purify it and then inactivate it using UV light for safe use as a vaccine. In order to improve its immunogenicity, they combined it with different adjuvants, one the classical album, and a second, based on stimulation by DNA motifs known as CpG presented in nano-particulate form. CpG motifs bind Toll like receptor 9 (TLR9) and induce strong innate immune activation, enhancing immunogenicity—in particular when presented in nanoparticulate form (17). They analysed immunogenicity of such a vaccine in mice and then in marmosets.

The study showed a number of important features. Animals receiving vaccinations using the alum based vaccine did generate some antibodies against HCV, although the levels of neutralisation were overall quite low. However, using the CpG based nanoparticle adjuvant K3-SPG, the same inactivated HCVcc preparation did induce neutralising antibody which was able to block infection. The levels of neutralisation in vitro reached around 60%, so blockade was not complete, but interestingly the sera did block infection by strains bearing envelopes from diverse genotypes, which would be an important attribute of any vaccine. There was also some evidence of T cell responses against components of the vaccine, capable of making interferon-gamma (IFNg). Analyses of marmoset T cell responses is difficult, so the overall levels of such responses are hard to gauge compared to human studies, but once again they were much more evident using the CpG based nanoparticle adjuvant K3-SPG. Induction of IFNg in response to HCV antigens does correlate with successful immune control of HCV in many human studies, was an important readout in the challenge studies performed previously using virally vectored vaccines, and remains the major measure immunogenicity in the development of HCV T cell vaccines in human trials (11).

This vaccine approach therefore is in many ways classical, but also relies heavily on the new adjuvant for its immunogenicity. The issue is to assess the potential for protection. This was not addressed in the marmoset model, although such animals can be infected with chimeric HCV/GBV-C viruses and that may be one possible approach (18). Additional pre-clinical models also include transgenic mouse strains which support HCV infection, some of which are immunologically intact (19). Given the lack of a clear correlate of protection, it would be very valuable to have more preclinical data before engaging in human studies. However, if it is possible to scale up and provide a highly robust safety profile for such a vaccine, immunogenicity studies in humans, followed by trials in populations at risk are really the only way to answer the question regarding protection. Possibly the blend of old and new approaches used in this study could pave the way for such future vaccines.


Acknowledgments

The author is grateful to the HCV vaccine team at Oxford, especially Professor Eleanor Barnes, for their longstanding support.

Funding: P Klenerman is funded by the Wellcome Trust (WT109965MA), the NIHR Biomedical Research Centre, Oxford and an NIHR Senior Investigator award.


Footnote

Provenance and Peer Review: This article was commissioned and reviewed by Section Editor Tingting Li, PhD (Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China).

Conflicts of Interest: The author has completed the ICMJE uniform disclosure form (available at http://dx.doi.org/10.21037/aob.2017.02.01). The author has no conflicts of interest to declare.

Ethical Statement: The author is accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.


References

  1. Webster DP, Klenerman P, Dusheiko GM, Hepatitis C. Lancet 2015;385:1124-35. [Crossref] [PubMed]
  2. Cox AL. MEDICINE. Global control of hepatitis C virus. Science 2015;349:790-1. [Crossref] [PubMed]
  3. Walker CM, Grakoui A. Hepatitis C virus: why do we need a vaccine to prevent a curable persistent infection? Curr Opin Immunol 2015;35:137-43. [Crossref] [PubMed]
  4. Meireles LC, Marinho RT, Van Damme P. Three decades of hepatitis B control with vaccination. World J Hepatol 2015;7:2127-32. [Crossref] [PubMed]
  5. Walker CM. Adaptive immunity to the hepatitis C virus. Adv Virus Res 2010;78:43-86. [Crossref] [PubMed]
  6. Timm J, Walker CM. Mutational escape of CD8+ T cell epitopes: implications for prevention and therapy of persistent hepatitis virus infections. Med Microbiol Immunol 2015;204:29-38. [Crossref] [PubMed]
  7. Folgori A, Capone S, Ruggeri L, et al. A T-cell HCV vaccine eliciting effective immunity against heterologous virus challenge in chimpanzees. Nat Med 2006;12:190-7. [Crossref] [PubMed]
  8. Swadling L, Klenerman P, Barnes E. Ever closer to a prophylactic vaccine for HCV. Expert Opin Biol Ther 2013;13:1109-24. [Crossref] [PubMed]
  9. Man John Law L, Landi A, Magee WC, et al. Progress towards a hepatitis C virus vaccine. Emerg Microbes Infect 2013;2:e79 [Crossref] [PubMed]
  10. Barnes E, Folgori A, Capone S, et al. Novel adenovirus-based vaccines induce broad and sustained T cell responses to HCV in man. Sci Transl Med 2012;4:115ra1 [Crossref] [PubMed]
  11. Swadling L, Capone S, Antrobus RD, et al. A human vaccine strategy based on chimpanzee adenoviral and MVA vectors that primes, boosts, and sustains functional HCV-specific T cell memory. Sci Transl Med 2014;6:261ra153 [Crossref] [PubMed]
  12. Freedman H, Logan MR, Law JL, et al. Structure and Function of the Hepatitis C Virus Envelope Glycoproteins E1 and E2: Antiviral and Vaccine Targets. ACS Infect Dis 2016;2:749-62. [Crossref] [PubMed]
  13. Law JL, Chen C, Wong J, et al. A hepatitis C virus (HCV) vaccine comprising envelope glycoproteins gpE1/gpE2 derived from a single isolate elicits broad cross-genotype neutralizing antibodies in humans. PLoS One 2013;8:e59776 [Crossref] [PubMed]
  14. Vietheer PT, Boo I, Gu J, et al. The core domain of hepatitis C virus glycoprotein E2 generates potent cross-neutralizing antibodies in guinea pigs. Hepatology 2016; [Epub ahead of print]. [PubMed]
  15. Yokokawa H, Higashino A, Suzuki S, et al. Induction of humoural and cellular immunity by immunisation with HCV particle vaccine in a non-human primate model. Gut 2016; [Epub ahead of print]. [Crossref] [PubMed]
  16. Kim S, Date T, Yokokawa H, et al. Development of hepatitis C virus genotype 3a cell culture system. Hepatology 2014;60:1838-50. [Crossref] [PubMed]
  17. Hanagata N. CpG oligodeoxynucleotide nanomedicines for the prophylaxis or treatment of cancers, infectious diseases, and allergies. Int J Nanomedicine 2017;12:515-31. [Crossref] [PubMed]
  18. Li T, Zhu S, Shuai L, et al. Infection of common marmosets with hepatitis C virus/GB virus-B chimeras. Hepatology 2014;59:789-802. [Crossref] [PubMed]
  19. Chen J, Zhao Y, Zhang C, et al. Persistent hepatitis C virus infections and hepatopathological manifestations in immune-competent humanized mice. Cell Res 2014;24:1050-66. [Crossref] [PubMed]
doi: 10.21037/aob.2017.02.01
Cite this article as: Klenerman P. HCV vaccines—back to the future? Ann Blood 2017;2:2.

Download Citation