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(1)
(2)
(3)
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2023 J. Lam, P. C. L. Kwok (eds.), Respirato ryDeliveryofBiologics,NucleicAcids,andVaccines, AAPS Introductions in the Pharmaceutical Sciences 8
https://doi.org/10.1007/978-3-031-47567-2_4
AntimicrobialPeptidesandProteinsfor Inhalation
Yuncheng Wang1, Rachel Y. K. Chang1, Warwick J. Britton
2, 3
and Hak-
Kim Chan
1
Advanced Drug Delivery Group, School of Pharmacy, Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia Centenary Institute and Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia Department of Clinical Immunology, Royal Prince Alfred Hospital, Camperdown, NSW, Australia
Hak-KimChan Email:kim.chan@sydney.edu.au
Abstract
Antimicrobial peptides and proteins (APPs) are gaining attraction as powerful agents against multidrug-resistant bacteria. The inhalation delivery of APPs has emerged as a potent tool for treating respiratory infections, given the ability to achieve high local drug concentrations in the lungs and minimizing systemic exposure. This chapter reviews recent in vitro and in vivo research on inhaled APPs, focusing on APP modiication and formulation strategies to develop stable and inhalable forms of APPs. These strategies include using d­enantiomers, dendrimers, and prodrugs as APP modiication strategies and applying new nebulizers, spray drying, and hydrogel techniques as formulation strategies. Despite the substantial progress in enhancing the biological activity of APPs, the biological stability of these novel molecules when aerosolized is yet to be further explored. Similarly, the formulation and production of inhalable liquid and powder formulations of APPs remain relatively unexplored. These domains are, however, critical for successful clinical translation and hence deserve further research efforts.
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Keywords Antimicrobial peptides and proteins (APPs), multidrug-resistant bacteria – Lung infections – Inhalation therapy
1 IntroductiontoAntimicrobialPeptidesa ndProteins InhalationTherapy
Antimicrobial peptides and proteins (APPs) in this chapter refer to all the peptides and proteins possessing direct and/or indirect inhibitory effects against bacteria. Direct-acting APPs kill bacteria directly, without the need for other chemicals or systems. By contrast, indirect-acting APPs (host antimicrobial capacity enhancer APPs), including some subunit vaccines/antibodies, recombinant cytokines/chemokines, trigger or enhance other antimicrobial defense responses to kill bacteria. Some APPs have both direct and indirect antimicrobial effects. For example, host defense peptides (HDP) are natural peptides that combat bacterial infection though their direct bactericidal properties and/or by inluencing the host’s immune responses. Some innate defense regulator (IDR) peptides, which are synthetic and short peptide analogs of HDPs, can have both direct and indirect antimicrobial activities [1]. APPs are becoming important therapeutic alternatives due to the increased number of infections caused by multidrug-resistant (MDR) bacteria. There are many APPs available or in development pipelines [2], and several molecules have been approved by the United States Food and Drug Administration (FDA): colistin, gramicidin D, daptomycin, vancomycin, oritavancin, dalbavancin, and telavancin [3]. APPs possess many advantages over conventional antibiotics, including but not limited to, their lower patterns of resistance, higher antimicrobial activity, and numerous available options. However, the use of APPs faces several limitations for treating lung infections. First, systemic therapeutic routes to deliver APPs normally result in low concentrations in the lung. Second, systemic immune responses to some APPs may cause toxicity. Third, APPs are generally harder to stabilize compared with small molecules.
Inhalation therapy, which has been applied in several commercial antibiotic products, including aztreonam, tobramycin solution, and tobramycin powder [4], is being considered for the delivery of APPs to overcome their limitations caused by systemic routes of administration. By using nebulizers, metered dose inhalers (MDIs), or dry powder inhalers (DPIs), liquid or dry powder formulations of APPs (natural or modiied) can be delivered to the lung directly (see Fig. 1) [5]. To generate inhalable aerosols, the aerodynamic diameter of droplets or particles containing drugs should be below 5 μm [6].
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Fig.1 Production and delivery of APP inhalable formulations (NPs, nanoparticles)
Inhalation solution and DPI are the two main formulations being studied for inhalation delivery of APPs. Nebulization has been the primary method for aerosolization and delivery of APPs into the respiratory tract. Commercial nebulizers, including air-jet, ultrasonic, and vibrating mesh nebulizers, are commonly used to deliver inhalation solutions. Air-jet nebulizers use compressed air to deliver the aerosols [7]. Vibrating mesh nebulizers produce aerosols by squeezing liquid through a perforated plate that vibrates at a high frequency (e.g., 100–300 kHz). By comparison, ultrasonic nebulizers exert ultrasonic waves directly into the liquid to cause a breakup at the liquid surface to produce the aerosols [8]. Regardless of the type of nebulizers, they will generate various degrees of stress on the APPs, which may impact the stability of the biologics. Newer devices, such as the surface acoustic wave atomizer [9], may also be considered for the delivery of APPs.
Multiple studies have been focused on APPs which are stable and inhalable in liquid formulations including peptides (TP359 [10, 11], POL7001 [12, 13],
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murepavadin [14, 15], LL-37 [16, 17], SPA4 [18, 19] ST3-H2A2 and IL10R1–7 [20, 21]) and proteins (pyocin S2 [22–24], endolysins [25–28], surfactant protein (SP)-D [29–31], lagellin [32] and granulocyte-macrophage colony­stimulating factor [33, 34]). Moreover, different strategies can be used to improve the stability and inhalability of these APP inhalation formulations.
To develop more portable and convenient inhalable products, powder formulation is another option for inhalation drug delivery. Since APPs tend to be more fragile than small molecules, using dry powder formulation eliminates the air-liquid interface and mechanical stresses to the biologics arising from nebulization. However, suitable excipients are necessary to stabilize the APPs in the dry state. In addition, powder formulations involve more complex manufacturing equipment, excipients, and physicochemical characterizations. To date, only a few studies utilized dry powder formulation technologies for APP inhalation delivery. This chapter will focus on strategies applied to the formulation of APPs suitable for inhalation.
2 CommercialandOff-LabelInhaledAPPs
2.1 Colistin
Colistin, a cationic polypeptide antibiotic that acts on the bacterial cell membrane, has been developed as the irst commercial inhalable APP product. Colistin is commonly used as the last treatment option for MDR bacterial infections because of its serious side effects. Inhaled colistin can also cause adverse effects, including cough, bronchoconstriction, and throat irritation. Thus, its prodrug, colistin methanesulfonate (CMS), was developed, and
released to the market as ColiFin® (Approved in Europe), Promixin
®
(approved in various European Union countries), and Colomycin® (approved in the UK and Ireland) for inhalation. Various nebulizers, such as the Respironics I-neb Adaptive Aerosol Delivery system, Aeroneb Go, Pari eFlow rapid, or Pari LC Sprint nebulizers are used for delivery of CMS [35].
A dry powder formulation of CMS (Colobreathe®, Teva UK Limited) was also developed [36] and approved for inhalational therapy by the European Medicines Agency [37]. A CMS dose of 125 mg in each capsule is administered to patients with the Turbospin delivery device. Another CMS dry powder formulation containing 25 mg of micronized CMS blended with lactose (60– 103
μm) was approved for compassionate use with Twincer inhaler in Netherlands [38]. Lactose was used as an excipient as it is FDA-approved and widely used in inhalation formulations [39].
Diverse animal models, such as mouse, rat, piglet, sheep, and monkey, have
also been extensively explored to study the pharmacokinetics, safety, and
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eficacy of colistin [40–47].
2.2 Vancomycin
Vancomycin, a branched tricyclic glycopeptide isolated from Amycolatopsis orientalis, has been studied for inhalation delivery in both preclinical and
clinical trials [48, 49]. In another clinical study, nebulized vancomycin eradicated methicillin-resistant Staphylococcusaureus (MRSA) in 84.3% of the patients [50]. However, the addition of inhaled vancomycin did not affect the rates of MRSA eradication at the end of a 28-day oral antibiotic treatment regimen in a double-blind randomized, placebo-controlled study [51]. Vancomycin dry powder formulation (AeroVanc™) was tested in multiple clinical trials without disclosing its manufacturing technique. AeroVanc was found to be well tolerated, and remained above the usual minimum inhibitory concentration (MIC) values for MRSA for up to 24 h in the sputum [38], and it signiicantly reduced MRSA sputum density in the subsequent clinical trial [39]. However, the bacterial killing effect was not promising, which was probably why a phase 3 study of AeroVanc in CF (cystic ibrosis) patients did not meet its primary endpoint of improvement in FEV1 (i.e., lung function)
and reduction in pulmonary exacerbations, which made the company halt the project [40]. Although different clinical trials have shown different eficacy results, inhaled vancomycin by nebulization of the intravenous formulation has been applied for off-label use to treat MRSA in CF patients based on its promising safety proile [51].
3 ClinicalTrialStageProducts
3.1 Lactoferrin
Lactoferrin is an iron-binding glycoprotein with antimicrobial activity. A phase 1a clinical trial of ALX-009 (a combination of bovine lactoferrin and hypothiocyanite) tested its safety and tolerability. Based on this safety proile, CF and bronchiectasis patients have been recruited for a phase 1b clinical trial to test its eficacy [52]. In a previous study, ALX-009 showed signiicantly higher antibacterial activity than tobramycin against Pseudomonas aeruginosa in CF sputum samples [53]. In a P.aeruginosa lung infection model, delivery of aerosolized lactoferrin (200 μg/mouse) reduced both the iniltration of leukocytes and pulmonary bacterial load in CF mice. Furthermore, lactoferrin treatment decreased pulmonary iron levels caused by CF in mice (iron is essential for P.aeruginosa to develop antibiotic resistance) [54, 55].
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4 ResearchStageStudies
Apart from colistin and vancomycin (off-label use), most of the APPs are not available as inhaled therapeutics in the market due to some technical hurdles. Firstly, APP denaturation and degradation in the sputum and lungs, particularly in infected patients, are unpredictable prior to the conduct of in vivo studies. Secondly, APPs are normally more fragile to mechanical stress compared to small molecules, and this increases the uncertainty in both formulation and drug delivery. Thirdly, these biologics may trigger immune responses in humans. Innovative APP modiication and formulation strategies are investigated and summarized in this section (see Table 1).
Table1 Summary of research studies on inhaled APPs
Strategy APP Formulation Target
bacteria or disease
Keyindings Reference
Enantiomeric optimization
WLBU2 Liquid P.aeruginosa Enantiomeric
optimization of WLBU2 (D8­WLBU2) showed higher stability, higher therapeutic index, and reduced toxicity
[56]
D8-WLBU2
Dendrimer synthesis
SET-M33DIM Liquid P.aeruginosa Two-branched
dimeric form of peptide SET­M33 (SET­M33DIM) was resistant to loss of activity in biological luids and maintained its antimicrobial activity
[57–59]
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