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Designer Oncolytic Adenovirus: Coming of Age

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Designer Oncolytic Adenovirus: Coming of Age cancers Review Designer Oncolytic Adenovirus: Coming of Age Alexander T. Baker 1 ID , Carmen Aguirre-Hernández 2, Gunnel Halldén 2 and Alan L. Parker 1,* ID 1 Division of Cancer and Genetics, Cardiff University School of Medicine, Cardiff CF14 4XN, UK; [email protected] 2 Centre for Molecular Oncology, Barts Cancer Institute, Queen Mary University of London, London EC1M 6BQ, UK; [email protected] (C.A.-H.); [email protected] (G.H.) * Correspondence: [email protected] Received: 20 May 2018; Accepted: 11 June 2018; Published: 14 June 2018 Abstract: The licensing of talimogene laherparepvec (T-Vec) represented a landmark moment for oncolytic virotherapy, since it provided unequivocal evidence for the long-touted potential of genetically modified replicating viruses as anti-cancer agents. Whilst T-Vec is promising as a locally delivered virotherapy, especially in combination with immune-checkpoint inhibitors, the quest continues for a virus capable of specific tumour cell killing via systemic administration. One candidate is oncolytic adenovirus (Ad); it’s double stranded DNA genome is easily manipulated and a wide range of strategies and technologies have been employed to empower the vector with improved pharmacokinetics and tumour targeting ability. As well characterised clinical and experimental agents, we have detailed knowledge of adenoviruses’ mechanisms of pathogenicity, supported by detailed virological studies and in vivo interactions. In this review we highlight the strides made in the engineering of bespoke adenoviral vectors to specifically infect, replicate within, and destroy tumour cells. We discuss how mutations in genes regulating adenoviral replication after cell entry can be used to restrict replication to the tumour, and summarise how detailed knowledge of viral capsid interactions enable rational modification to eliminate native tropisms, and simultaneously promote active uptake by cancerous tissues. We argue that these designer-viruses, exploiting the viruses natural mechanisms and regulated at every level of replication, represent the ideal platforms for local overexpression of therapeutic transgenes such as immunomodulatory agents. Where T-Vec has paved the way, Ad-based vectors now follow. The era of designer oncolytic virotherapies looks decidedly as though it will soon become a reality. Keywords: adenovirus; oncolytic; targeting; virotherapy; cancer; αvβ6 integrin; immunotherapy; tropism 1. Introduction Once described by Peter Medawar (recipient of the 1960 Nobel prize for the discovery of immunological tolerance) as “a piece of bad news wrapped up in protein”[1], oncolytic viruses are beginning to emerge as clinically useful agents in the cancer arena. As long ago as 1953, viruses were reported to selectively kill cancer cells; Koprowski et al. concluded that “Studies on the specificity of such a reaction for a given virus [ ... ] may facilitate an understanding of the mechanism of selective cell destruction”, and in so doing, predicted what is now a global research effort to harness viruses as cancer therapeutics [2]. A wide range of different viruses are now under investigation as cancer therapeutics, ranging from wildtype small RNA viruses like Respiratory Enteric Orphan virus (Reovirus), to intricately engineered large DNA viruses such as herpes simplex [3,4]. Few virotherapies have seen as much development as those based on adenovirus (Ad). These non-enveloped, double stranded DNA viruses are generating increasing interest as therapeutic Cancers 2018, 10, 201; doi:10.3390/cancers10060201 www.mdpi.com/journal/cancers Cancers 2018, 10, 201 2 of 39 Cancers 2018, 10, x FOR PEER REVIEW 2 of 39 vectors for cancer owing to their low levels of pathogenicity and relative ease of manipulation. A search of clinicaltrials.govsearch of clinicaltrials.gov shows in excess shows of in 180 excess clinical of 180 trials clinical utilising trials utilising adenoviruses, adenoviruses, in some in form, some asform, a cancer therapeuticas a cancer at time therapeutic of writing at time [5]. of Whether writing the[5]. therapeuticWhether the agenttherapeutic is designed agent is as designed a vaccine, as a gene vaccine, therapy, or oncolyticgene therapy, virus, or all oncolytic are dependent virus, all on are our dependen abilityt to on engineer our ability these to engineer viruses andthese manipulate viruses and their naturalmanipulate tropisms their to ablate natural pathogenicity tropisms to ablate and pathogenicity achieve therapeutic and achieve benefit. therapeutic benefit. This engineeringThis engineering is based is based on intricate on intricate understanding understanding of adenovirus of adenovirus virology. virology. These These non-enveloped non- enveloped viruses possess an icosahedral capsid comprised of 3 major, and 4 minor, capsid proteins viruses possess an icosahedral capsid comprised of 3 major, and 4 minor, capsid proteins described in described in Figure 1. The hexon is the most abundant capsid protein, comprising the 20 facets of the Figure1. The hexon is the most abundant capsid protein, comprising the 20 facets of the dodecahedral dodecahedral viral capsid. At each vertex, shown in Figure 1, there is a penton base with the fiber viral capsid.protein Atprojecting each vertex, from shownit. These in Figureproteins1, thereinfluence is a penton secondary base and with primary the fiber viral protein tropisms, projecting fromrespectively it. These proteins (Figure influence 1). An in secondarydepth review and of primaryadenoviral viral structure tropisms, can be respectively found in the (Figure review1). by An in depthRussell review [6]. of adenoviral structure can be found in the review by Russell [6]. A B FigureFigure 1. Adenovirus 1. Adenovirus Structure. Structure.Cartoon Cartoon view view ofof adenovirus, highlig highlightinghting the the major major capsid capsid proteins proteins as labelled (A). Structural view of an adenovirus vertex modelled from CryoEM structure (PDB: 6B1T) as labelled (A). Structural view of an adenovirus vertex modelled from CryoEM structure (PDB: 6B1T) showing penton (green) with hexons (dark and light blue) and minor capsid proteins (red) (B). showing penton (green) with hexons (dark and light blue) and minor capsid proteins (red) (B). Canonically there are 57 adenoviral serotypes divided amongst seven species—A-G—as Canonically there are 57 adenoviral serotypes divided amongst seven species—A-G—as determined by serological testing for neutralising antibody activity, though the true diversity may be determinedmuch greater by serological [7]. Phylogenetic testing analysis for neutralising of the species antibody D adenoviruses activity, though (the largest the true of the diversity human may be muchadenoviral greater species) [7]. Phylogenetic reveals homologous analysis recombinat of the speciesion between D adenoviruses hypervariable (the regions largest in each of the of the human adenoviralmajor capsid species) proteins reveals and homologous in every member recombination of this subtype. between In turn, hypervariable there will be regionsa direct impact in each on of the majorcapsid capsid structure proteins and and thus in immune every member recognition of this [8]. subtype.The authors In of turn, this therestudy willestimate be a that direct serology impact on capsidtesting structure (the standard and thus on immune which the recognition canonical 57[ serotypes8]. The authors is based) of can this only study identify estimate 53% of that 38 fully serology testingcharacterised (the standard species on whichD adenoviruses the canonical unambiguously. 57 serotypes An isalternative based) can taxonomic only identify proposal 53% attempts of 38 fully characterisedto reflect speciesthe genetic D adenoviruses variation observed unambiguously. in the ≈35 An Kbp alternative linear dsDNA taxonomic genomes proposal of isolated attempts to adenoviruses, yielding 86 candidate serotypes as of November 2017 [9,10]. reflect the genetic variation observed in the ≈35 Kbp linear dsDNA genomes of isolated adenoviruses, Oncolytic adenoviruses must be capable of efficiently and selectively destroying cancerous cells yielding 86 candidate serotypes as of November 2017 [9,10]. and avoid damaging healthy tissues. This can be achieved through selective replication within cancer Oncolyticcells, a strategy adenoviruses important must for virotherapies. be capable of Since efficiently the process and selectively of replication destroying within the cancerous tumour cells and avoidmicroenvironment damaging healthy allows tissues.amplification This canof the be ther achievedapeutic through at the point selective of need, replication and the process within of cancer cells,oncolysis a strategy (the important “bursting” forof virus virotherapies. filled tumour Since cells) theis innately process immunogenic, of replication it facilitates within thea host- tumour microenvironmentanti-tumour response. allows There amplification are many means of the of therapeutic achieving oncolysis, at the pointbut most of need,strategies and rely the upon process of oncolysisthe lytic (theproperties “bursting” of virotherapies, of virus filled or encoding tumour transgenes cells) is innately within the immunogenic, viral genome itto facilitatesinduce a host-anti-tumournecrosis or apoptosis, response. both There of which are manyserve to means stimulate ofachieving recruitment oncolysis, of immune but cells most to the strategies tumour rely upon the lytic properties of virotherapies, or encoding
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