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Leading Article Vaccines Against Gut Pathogens

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Leading Article Vaccines Against Gut Pathogens Gut 1999;45:633–635 633 Gut: first published as 10.1136/gut.45.5.633 on 1 November 1999. Downloaded from Leading article Vaccines against gut pathogens Many infectious agents enter the body using the oral route development.15 Salmonella strains harbouring mutations and are able to establish infections in or through the gut. in genes of the shikimate pathway (aro genes) have For protection against most pathogens we rely on impaired ability to grow in mammalian tissues (they are immunity to prevent or limit infection. The expression of starved in vivo for the aromatic ring).6 Salmonella strains protective immunity in the gut is normally dependent both harbouring mutations in one or two aro genes (i.e., aroA, on local (mucosal) and systemic mechanisms. In order to aroC ) are eVective vaccines in several animal models after obtain full protection against some pathogens, particularly single dose oral administration and induce strong Th1 type non-invasive micro-organisms such as Vibrio cholerae, and mucosal responses.7 An aroC/aroD mutant of S typhi mucosal immunity may be particularly important. There is was well tolerated clinically in human volunteers; mild a need to take these factors into account when designing transient bacteraemia in a minority of the subjects was the vaccines targeting gut pathogens. Conventional parenteral only drawback.8 Th1 responses, cytotoxic T lymphocyte vaccines (injected vaccines) can induce a degree of responses, and IgG, IgA secreting gut derived lymphocytes systemic immunity but are generally poor stimulators of appeared in the majority of vaccinees.89 In an attempt to mucosal responses. Thus, a basic prerequisite for designing render the vaccine even safer, an aroA/aroC/htrA triple novel vaccines against gut associated pathogens may be the mutant has been engineered (htrA encodes a stress protein requirement to induce mucosal and potentially systemic associated with survival of salmonella in macrophages) immunity.1 The most eVective way to induce local which has been shown to be immunogenic in humans with immunity against infectious agents has so far proved to be no adverse eVects or bacteraemia.10 Other genetically direct application of vaccine antigens to mucosal surfaces modified S typhi strains are currently being evaluated in (oral or intranasal delivery).2 The fact that we have so few humans11 12 and similar attenuation strategies have been eVective oral vaccines shows that the induction of used to construct live attenuated shigella and cholera http://gut.bmj.com/ protective immunity through oral immunisation is not an vaccines.13 14 easy goal to achieve as many antigens are poor oral immu- Live attenuated salmonella vaccines are useful vectors nogens. Here we will focus, using bacterial pathogens as for the delivery of recombinant antigens to the immune examples, on some recent approaches being used to gener- system. Genes encoding protective antigens from diVerent ate novel oral vaccines. pathogens can be cloned and expressed in salmonella vac- cine strains, which are then used to piggy back these anti- Live vaccines gens to the mucosal and systemic immune systems via oral on September 24, 2021 by guest. Protected copyright. Oral vaccines can be based on either live or non-living immunisation. A variety of foreign antigens from unrelated antigens. The generation of modern live oral vaccines enteric pathogens (e.g., shigella, V cholerae, pathogenic involves the construction of genetically defined attenuated Escherichia coli, and helminths) have been expressed in sal- micro-organisms capable of inducing immunity in a monella vaccine strains, often with the induction of good non-harmful way. The recent improved understanding of immune responses, opening up possible routes to multiva- bacterial virulence associated gene function oVers the lent oral vaccines. A few limited clinical studies have possibility of introducing multiple, defined, attenuating already been attempted.115 and stable mutations into the genome of bacterial pathogens. Furthermore, the use of precisely attenuated Non-living mucosal vaccines bacterial vectors as carriers for recombinant heterologous The observed non-responsiveness of the healthy host to antigens can lead to the generation of multivalent many non-living environmental and food antigens (includ- vaccines.3 ing many experimental oral vaccines) may well represent a mechanism to prevent wasteful or deleterious immune LIVE ATTENUATED SALMONELLA AND SHIGELLA VACCINES responses. Despite the apparent selective nature of the Perhaps the most advanced work of this type has been per- mucosal immune system, some bacterially derived anti- formed using salmonella species, in particular Salmonella gens, such as E coli labile toxin (LT) and cholera toxin typhi, the cause of typhoid. Killed whole cell typhoid (CT), can evoke potent systemic and secretory immune vaccines and the purified S typhi Vi capsular polysaccha- responses following administration to a mucosal surface ride confer some degree of protection after parenteral (mucosal immunogens).16 In humans, however, ingestion administration but fail to trigger strong cellular Th1 type T of microgram quantities of either LT or CT is suYcient to cell responses and local gut responses associated with 4 protection. A number of experimental live oral salmonella Abbreviations used in this article: LT, labile toxin; CT, cholera vaccines designed using modern technology are in toxin. Leading articles express the views of the author and not those of the editor and editorial board. 634 Mastroeni, Bowe, Cahill, et al cause the profound fluid secretions typical of traveller’s and controlled study, recombinant H pylori urease was adminis- cholera diarrhoea respectively.17 Nevertheless, there re- tered in combination with active LT to H pylori infected mains considerable interest in LT and CT, and their pen- volunteers. Although no change in gastric inflammation was Gut: first published as 10.1136/gut.45.5.633 on 1 November 1999. Downloaded from tameric receptor binding domains, as vaccine antigens and observed, there was an increase in circulating urease specific as vaccine delivery vehicles. In humans, the non-toxic B IgA producing cells and a decrease in bacterial load. Unfor- subunit pentamer moiety of CT (CT-B) induces strong tunately, the majority of volunteers who received LT devel- intestinal IgA antibody responses and long-lasting oped diarrhoea.22 Although not clinically practicable, this immunological memory after oral ingestion.18 Based on study demonstrated the feasibility of future eVective vaccine this, recombinant CT-B has become an important compo- development. New technologies including delivery meth- nent of recently developed oral vaccines against cholera ods, new antigens and non-toxic adjuvants should help us and diarrhoea caused by enterotoxigenic E coli.19 In paral- realise this goal. The search for protective H pylori antigens lel, novel ways of delivering toxin binding domains are now is still ongoing and has been limited by the lack of appropri- being realised. The demonstration that LT-B expressed in ate, well characterised antigens. The release of the H pylori transgenic potatoes is immunogenic in mice and humans genome sequence and analysis by many laboratories will suggests that an edible vaccine against a diarrhoeal disease potentially lead to the identification of novel antigens for H is not implausible.20 pylori vaccines. The predominantly Th1 immune profile in The receptor binding domains of LT and CT have also many infected patients may contribute to the immunopa- been used as antigen delivery systems. In mice, oral admin- thology observed.29 It may therefore be advantageous to istration of antigens coupled to CT-B, either chemically or modulate host immunity, such that vaccinated individuals genetically, has in several systems been found to enhance mount a Th2 or Th0 response to infection. Further insights both intestinal and systemic IgA immune responses against into appropriate vaccine design may come from the study of the CT-B coupled antigen.21 Significantly, potent mucosal the immune response generated by those who spontane- adjuvant activity has been associated with native CT and LT. ously clear infection. This has been seen among infants and In experimental animals, CT and LT have potent adjuvant elderly people.30 properties which stimulate mucosal IgA and systemic immune responses to unrelated, non-coupled antigens after Conclusions mucosal co-immunisation. Results in humans also suggest 22 23 Work on the design of novel vaccines against gut pathogens that wild type LT may have adjuvant properties. In part, is entering an exciting era. Our general improved this adjuvant activity seems to be linked to the A subunit understanding of the molecular basis of disease means that catalysed ADP-ribosylating action of CT and LT. To facili- rational approaches can replace the more empirical tate their use as mucosal adjuvants, several research groups approaches previously used. However, there are consider- have successfully attenuated the toxicity of CT and LT 24 25 able technical barriers to be overcome. We need to under- through genetic engineering of the enzymatic A subunit. stand how to deliver vaccine antigens orally in an immuno- Although some mutations introduced into the A subunit of genic form and in a way that will avoid stimulation of CT or LT were found to prevent toxin assembly or had no inappropriate and potentially damaging immune re- eVect on enzymatic activity, certain mutations (e.g. LTK63)
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