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Phage Pathogen Routeof
administration/animal
Dose Immunological
effects
Reference
host’s immune system
Dufour et al. [43] have not only compared the inlammatory response of phages to uninfected controls in healthy mice but also to antibiotics in acute E.coli pneumonia in mice. In uninfected mice, both phage 536_P1 and LM33_P1 did not signiicantly change the complete blood count compared to the control, except that LM33_P1 reduced the lymphocyte count at 7 hours post-administration but that returned to normal 10 hours after that. Phage 536_P1 elevated IFN-y, IL-12, MCP-1 and keratinocyte chemoattractant at 17 hours post-administration, whereas LM33_P1 showed no difference in the control at any time point. Phage 536_P1 also decreased IL-6, IL-1β, TNF-α, keratinocyte chemoattractant, and MCP-1 to similar levels to that achieved by ceftriaxone, a commonly used antibiotic for pneumonia.
Intratracheal delivery of P.aeruginosa PAO1 and ilamentous phage Pf4 resulted in a reduction of CXCL1, IL-17, IL-1β, IL-17 and IL-10. However, the pro-inlammatory cytokine, IL-12p40, was signiicantly higher at 48 hours post-administration compared to PAO1-infection alone [44]. In contrast, intranasal administration of a phage cocktail did not affect serum cytokines such as IL-1a, IL-1b, IL-2, IL-4, IL-6, IL-10, IL-12, IL-17A, TNF-a and G-CSF [8]. Similarly, intranasal instillation of phage PAK_P1 showed no signiicant increase in cytokine production compared to the control except for IFN-y and TNF-α [38]. Interestingly, PAK_P1 displayed immunophage synergy where it relied on the host’s immune system to effectively resolve the bacterial infection. This response is yet to be observed in other species of phages. There is currently no literature investigating the adaptive responses of phages in the lungs.
5 FormulationsandStability
Stability is of utmost importance for any drug candidate, whether it is a small molecule or biologic. Instability affects the delivery of the correct dose and bioavailability and can form degradants. The PhagoBurn trial failed to show a clinical difference between phage therapy and standard-of-care treatment due to the instability of the phages, which led to the administration of a subtherapeutic dose [26]. This highlights another hurdle that phage therapy must overcome to be actively used clinically. Recent research suggests that adding a stabiliser to the formulation can minimise the loss of viability over
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long-term storage [45–47]. Naturally, the safety of these excipients must be investigated before clinical use.
5.1 LiquidAerosols
The signiicance of the PhagoBurn trial rested on the fact that it was the irst randomised controlled trial investigating a lytic phage cocktail that was produced according to good manufacturing practice and was approved by national health regulators in Belgium, France, and Switzerland. The shortfall
of the trial was due to the unexpected decline by 104–10
5
PFU/mL in titre
post-manufacturing, which resulted in a much lower than the expected­administered dose of 10
6
PFU/mL [26]. Post-trial stability study
demonstrated that the initial titre reduction occurred 15
days after manufacturing. A major conclusion of the trial was that decreasing the number of phage types and improving the stability were needed for future trials. As the therapy was intended for IV injection, the cocktail was a liquid formulation that was thought to be stable under refrigeration [48, 49]. However, Duyvejonck et al. [46] recently conirmed that at 4 °C phages with a
high titre of 10
9
PFU/mL were relatively more stable than the 107 PFU/mL stock. This demonstrated that phage titre decreases over time even when stored refrigerated, especially at lower starting titres [50]. Although ancillary stability testing prior to the PhagoBurn trial found that the individual phages
of the cocktail were very stable at a titre of ≥10
9
PFU/mL for over 24 months, the authors reported that there was a 1000-fold reduction of the stock within 15
days of manufacture [26]. The starting overall titre of the cocktail was
10
9
PFU/mL, meaning that the average titre for each of the 12 phages was
8.3 × 107 PFU/mL, which was lower than that tested for their individual stability. As discussed above, phage OMKO1 had synergy with ceftazidime in treating MDR P.
aeruginosa infection [34]. Blazanin et al. [51] tested the effect of various conditions, including elevated temperature, varying saline and urea concentrations, that phages may encounter in vitro and in vivo to study their stability. Interestingly, although moderate titre reduction was only observed from 65 to 75 °C, the plaque morphology of all heat-treated phages changed. Further investigation demonstrated that the growth ability of phages was signiicantly decreased compared to the control regardless of the duration of thermal exposure at 70 °C [51]. A change in plaque morphology may not necessarily equate to a change in the phenotype of the phage, as transmission electronic microscopy (TEM) of phages (TS3, TS6, TS13) treated at 70 °C for 30 minutes showed no morphological difference compared to the control [52]. On the other hand, phage OMKO1 may not be a
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thermally stable phage as phages TS3, TS6 and TS13 were speciically isolated for their thermal-resistant properties [52]. Furthermore, urea stress tolerance over time revealed that the survivability of phage OMKO1 was unaffected at lower urea concentrations of 1–2 M and was not signiicantly different to that without urea [51]. However, phage survival reduced quickly over the 90 minutes in 3–4 M urea [51]. Unlike heat and high urea concentrations, high saline concentrations did not impact phage infectivity [51]. Phages Acibel004, PNM, 14/1, and ISP stored in normal saline at 4 °C at
10
9
PFU/mL for over 300 days showed no change in phage infectivity [46]. Since saline is commonly used in pharmaceutical products, stability in saline makes it a viable vehicle for formulating therapeutic phages.
Liquid droplets for lung delivery can be produced by jet nebulisation, vibrating mesh nebulisation, and colliding jets (Respimat® inhaler) [53],
which have been applied to aerosolising phages. Comparison between these three methods showed differences in titre loss post-nebulisation [54]. Jet nebulised active PEV44 phages was signi
icantly lower at
5.4
× 104 PFU/minute, compared to those aerosolised from a vibrating-mesh nebuliser (3.3 × 108 PFU/minute) and soft-mist inhaler (4.6 × 106 PFU/minute) [54]. The possible reason for such a discrepancy in
titre loss between the different nebulisers is likely due to the intense shearing in jet nebulisers that damaged the phages [53, 54]. Infectivity correlates with the structural integrity of phages as the extent of capsid and tail detachment was associated with the titre loss of PEV44 [55]. The degree of reduction was higher in Siphoviridae phages (e.g. D29) and Myoviridae (e.g. PEV44) [55] due to their longer tails than those of Podoviridae phages [56]. The examination of structural differences in the infectivity of nebulised phages revealed that the long-tailed D29 and PEV40 suffered from more head-tail detachment that correlated with the reduction in the titre [56]. On the other hand, jet nebulisation had minimal impact on PEV2 as its short tail is less likely to break. Therefore, structural differences between phages and the choice of the nebuliser are important factors to consider for respiratory delivery.
FluMist® is the
irst intranasal vaccine against seasonal inluenza. It
contains the live attenuated in
luenza virus and is stable under refrigeration [57]. The reason for its stability is due to having been frozen at a temperature below the glass transition temperature [58]. Although phages are also viruses and may also be formulated similarly, cold-chain maintenance is dificult and costly. Therefore, it is worthwhile to investigate formulations that are stable at room temperature, such as solid dosage forms.
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5.2 DryPowderA erosols
Dry powder formulations for inhalation are popular owing to their higher chemical stability than liquids and storage at ambient temperature [59]. Lyophilisation has an immediate but minor negative impact on the infectivity of speciic phages, depending on the excipients used [45, 60]. Storage of the lyophilised formulation for another 27 months only showed an insigniicant decrease in the titre [60]. Storage for 8 years at 4 °C did not reduce the titre signiicantly (n = 1), except when 0.8 M trehalose was used as an excipient, for which a 1.75-log titre reduction was observed [46]. However, lyophilised powders have ill-deined particle shapes and sizes so they may not be suitable for inhalation.
Spray drying is a one-step process that can produce inhalable phage powders with only a moderate titre loss [47, 61, 62]. The spray drying temperature may negatively impact phage stability, in turn affecting phage infectivity and aerosol performance. A low drying temperature is required to minimise this impact [63, 64]. The storage temperature may also inluence phage viability [45, 62]. Storage of spray-dried phages PEV2 and PEV40 at 4 and 20 °C in vacuum packaging yielded different results that were formulation-dependent [62]. For PEV2, formulations containing 70% trehalose and 30% leucine were stable with no further titre reduction up to 1 year at both 4 and 20 °C. On the other hand, those containing 60% trehalose and 40% leucine showed temperature-dependent titre reduction [62]. Similar to the lyophilisation of phage ISP [60], spray drying PEV2 and PEV40 resulted in an immediate reduction of 0.7 and 0.2 log PFU/mL, respectively, regardless of the different excipient combinations [62]. PEV2 titres were not further affected when stored at 4 and 20 °C if the formulation contained 70% trehalose and 30% leucine [62]. However, when the trehalose content decreased to 60%, PEV2 was stable when stored at 4 °C for up to 12 months but its viability decreased signiicantly when stored at 20 °C after 6 months. PEV40 displayed more variability in the titre and for all formulations and temperatures studied but its titre was stable for up to 3 months with no further degradation [62]. Currently, lactose is approved as an excipient for inhalation. On the other hand, trehalose and leucine are yet to be approved for inhalation, although they are Generally Recognised as Safe excipients for other types of formulations. They have been used in experimental inhaled powders as they can improve the physical stability of the drug/powder and have relatively low toxicity [65]. Flexible small sugars such as trehalose protects against heat and water-removal which are desirable traits for phage formulations as the proteins require hydrogen bonds for structural stability [66, 67] by decreasing molecular mobility [68]. Spray-dried phages PEV20
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and PEV61 showed different storage characteristics depending on the formulation, which consisted of lactose (55–90%) and leucine (45–10%) [47]. In vitro cell studies demonstrated that the combination of phage, lactose and leucine did not negatively affect the viability of human epithelial cells and macrophages, supporting the safety of these excipients [47]. A high lactose content of 80% and above increased the stability of the phage powders at ambient temperature when they were packed in an aluminium pouch at 15% relative humidity (RH) and stored at 20 °C/60% RH [47]. This resulted in minimal titre loss over 12 months for phages PEV1, PEV61 and PEV20. The extent of titre reduction and the duration of stability during storage varied between phage species. PEV20 was more prone to inactivation compared to PEV1 and PEV61. A low leucine content (10%) was shown to be suficient to protect phage powders from moisture-induced degradation. Another major factor to consider is the difference between the glass transition temperature (Tg) and storage temperature (Ts), i.e. Tg − Ts [68]. Higher storage RH lowers
the Tg, consequently lowering the Tg − Ts value, resulting in phage titre reduction regardless of the storage temperature. Chang et al. [68]
demonstrated that the powder adsorbed more moisture at 33% RH than at 15% RH. Since water is a strong plasticiser, protein mobility was increased and consequently phage stability decreased. The spray-dried phages remained stable when Tg − Ts was >46 °C, hence it is vital to consider Tg when
selecting the storage conditions for phage powders. To facilitate storage, phage powders should be stable at room temperature (20–25 °C), meaning that Tg should be at least 71 °C, which may be achievable by choosing
excipient/s with a high Tg and/or keeping the storage RH low.
There is currently a lack of longer-term stability studies lasting 12 months or longer, given that the shelf-life is very important if phage therapy is to be extensively utilised in the future. The formulation of a personalised cocktail from a phagogram in clinical settings will only be possible if there are viable phage products readily available.
6 Future Dire ctions
Currently, there is no regulatory framework governing the manufacture and use of phage products but Belgium has established a phage monograph for magistral preparations endorsed by their Federal Agency for Medicines and Health Products [69]. However, this is purposed for patient-speciic compassionate use rather than scaled-up therapeutics such as antibiotics. Phagoburn was the irst clinical trial of a GMP-grade phage cocktail and its protocols were approved by the French Food Safety Agency [26]. Similar to
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biologics, phage manufacturers must be GMP compliant and require regulations to ensure the safety, purity, and eficacy of the product. It is very likely that the costs involved in the production of phage products will exceed that of antibiotics, which would incur a inancial strain on the stakeholders. However, given the increasing incidence of resistant infections, phage therapy could be a potentially life-saving option, especially when used concomitantly with antibiotics.
High-quality clinical trials of phage therapy are required. Due to the lack of pharmacokinetic and pharmacodynamic studies, there is limited understanding of the optimal dose of phages [6, 14]. Their dosage may be
species-speci
ic but the common dose tested in published studies is 107–
109 PFU/mL [6, 8, 9, 12, 20, 34, 70]. An in vivo study in neutropenic BALB/c mice using an intratracheal anti-pseudomonas phage, PEV31, demonstrated dose-dependent responses in phage replication in situ, the number of emergent phage-resistant bacteria, and the level of proin
lammatory cytokines (IL-1β, IL-6, TNF-α) [71]. However, the extent of bacterial load clearance was independent of the dose of phage delivered [71]. It is unclear whether this inding is phage-dependent or whether it is applicable to all phages because there is insuficient data on dosing for all routes of phage administration [14]. Nevertheless, there is an increasing number of registered clinical trials on phages [72] that can mend the current gaps in knowledge. A major safety concern of administering phages is their purity as endotoxins released from the host bacteria as part of the manufacturing process will negatively impact the patient. Furthermore, bacteriolysis by phages during treatment may rapidly release endotoxins which may lead to a cascade of pro-inlammatory responses. Although adverse events are seldom reported in the literature and phage therapy is generally considered to be safe [14], a systematic review reports that the quality of evidence on the safety of phage therapy is low or moderate because most published studies were case studies of individual patients [73]. FDA limits the endotoxin levels for the single parenteral dose to 5 endotoxin units (EU)/kg of body weight per hour of administration. Following current GMP is the safest method in producing phages for clinical use, as conirmed by Fabijan et al. [70], who reported no safety concerns in treating severe S.aureus infections.
Re-emergence of phage therapy for MDR infections has highlighted the knowledge gaps that are preventing its wide clinical use. High-quality clinical trials are undoubtedly needed to investigate their safety, quality, and eficacy.
Acknowledgement
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The authors received no inancial support for the research, authorship, and publication of this article.
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