Reformulating Surfactant for the Delivery of Cathelicidins
Notice bibliographique
Résumé
Background The complex branching structure of the lung makes direct delivery of drugs, such as the antimicrobial peptides cathelicidins, to the small and distal airways a major challenge. To address this issue our lab has been investigating the use of exogenous surfactant (BLES), to facilitate the pulmonary delivery of cathelicidins. BLES is a lipoprotein complex capable of spreading through the lung. Its major lipid components are phosphatidylglycerol (PG; 10%), phosphatidylcholine (PC; 40%) and dipalmitoylphosphatidylcholine (DPPC;40%). Although, BLES in combination with cathelicidins has shown promising results, the presence of BLES has also been shown to significantly reduce the ability of these peptides to kill bacteria. Objectives 1) Determine the lipid components of BLES that are limiting the bactericidal effects of cathelicidins, 2) reconstitute BLES to reduce its inhibitory effect on the antimicrobial properties of cathelicidins, and 3) assess the spreading and bacterial killing of reformulated BLES/cathelicidin preparations at a distal site. Hypothesis A reformulated BLES will improve the bacterial killing of BLES/cathelicidin mixtures, without reducing spreading to distal sites in vitro . Methods Antimicrobial assays were performed against a lab strain of Pseudomonas aeruginosa for four cathelicidins in the presence of individual surfactant lipids. BLES was also supplemented with different lipids to generate different relative amounts of PG (5–40%), PC (20–70%) and DPPC (20–70%). These different versions of BLES were combined with cathelicidins for bacterial killing curves and assessment on our newly developed wet bridge transfer system. This in vitro system was utilized to assess spreading and bacterial killing at distal sites. P. aeruginosa was seeded to the distal well and cathelicidins alone or resuspended in a reformulated BLES were administered to the delivery well. Results At concentrations found in BLES, PG was the only lipid component to significantly inhibit the bacterial killing of all cathelicidins tested. Furthermore, all reformulated surfactant preparations with lower PG concentrations than BLES were shown to significantly enhance peptide function compared to BLES. Experiments performed on the wet bridge transfer system showed that altering BLES to limit PG content (6–9%) significantly enhanced bacterial killing in the distal dish for suspended cathelicidins compared to BLES/cathelicidin. However, reducing the PG content of BLES to 5% was shown to significantly inhibit its ability to spread across the wet bridge transfer system. Moreover, when combined with cathelicidins it was shown have significantly lower bacterial killing in the distal dish compared to BLES. Discussion These results suggest that PG is the major component of BLES inhibiting the bacterial killing properties of cathelicidins. Furthermore, the data from the wet bridge experiments indicated that altering the lipid composition of BLES to limit PG‐content creates a more effective cathelicidin/surfactant preparation. Therefore, future studies should utilize artificial surfactants with lower levels of PG to delivery cathelicidins to the peripheral airways. However, some PG may be needed for peptide transfer and normal surfactant function. Support or Funding Information Lawson Internal Research Fund This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».