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Jordanova A, Tsanova A, Stoimenova E, Minkov I, Kostadinova A, Hazarosova R, Angelova R, Antonova K, Vitkova V, Staneva G, Grabchev I. Molecular Mechanisms of Action of Dendrimers with Antibacterial Activities on Model Lipid Membranes. Polymers (Basel) 2025; 17:929. [PMID: 40219317 PMCID: PMC11991017 DOI: 10.3390/polym17070929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2025] [Revised: 03/25/2025] [Accepted: 03/27/2025] [Indexed: 04/14/2025] Open
Abstract
In the last decades, numerous dendrimers with a variety of potential biomedical applications have been developed and investigated. The aim of the present study was to evaluate the molecular mechanisms of interaction between two dendrimers with proven antibacterial activity (4-N,N-dimethylamino-1,8-naphthalimide (Dab) and 3-bromo-Dab (Dab-Br)) and POPC (1-palmitoyl-2-oleoylphosphatidylcholine) model membranes (monolayers and liposomes). The pressure-area isotherms and the compressional modulus of the monolayers revealed that Dab is likely to penetrate the hydrophobic region of POPC, whereas Dab-Br inserts mainly into the lipid headgroup area. This assumption was confirmed by FTIR-ATR of POPC liposomes containing Dab and Dab-Br dendrimers. In addition, Dab induced a higher lipid order in POPC large unilamellar vesicles (LUVs) compared to Dab-Br. Moreover, both dendrimers changed the negative zeta potential of POPC vesicles to positive values, with slightly higher effect of Dab-Br, indicating electrostatic interactions between the lipid headgroups and dendrimers. Furthermore, Dab was able to reduce the average POPC LUVs' size, unlike Dab-Br. The visualization of giant unilamellar vesicles revealed that the increasing dendrimer concentration induced model membrane shrinking and complete disintegration, which was more prominent for Dab. Based on the experimental results, new fundamental knowledge about the destabilizing effect of dendrimers on model lipid membranes will be acquired with a focus on their application in pharmacology and clinical practice.
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Affiliation(s)
- Albena Jordanova
- Faculty of Medicine, Sofia University “St. Kliment Ohridski”, 1 Koziak Street, 1407 Sofia, Bulgaria; (A.T.); (E.S.); (I.M.); (I.G.)
| | - Asya Tsanova
- Faculty of Medicine, Sofia University “St. Kliment Ohridski”, 1 Koziak Street, 1407 Sofia, Bulgaria; (A.T.); (E.S.); (I.M.); (I.G.)
| | - Emilia Stoimenova
- Faculty of Medicine, Sofia University “St. Kliment Ohridski”, 1 Koziak Street, 1407 Sofia, Bulgaria; (A.T.); (E.S.); (I.M.); (I.G.)
| | - Ivan Minkov
- Faculty of Medicine, Sofia University “St. Kliment Ohridski”, 1 Koziak Street, 1407 Sofia, Bulgaria; (A.T.); (E.S.); (I.M.); (I.G.)
- Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 11, 1113 Sofia, Bulgaria
| | - Aneliya Kostadinova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria; (A.K.); (R.H.); (R.A.)
| | - Rusina Hazarosova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria; (A.K.); (R.H.); (R.A.)
| | - Ralitsa Angelova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria; (A.K.); (R.H.); (R.A.)
| | - Krassimira Antonova
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd., 1784 Sofia, Bulgaria; (K.A.)
| | - Victoria Vitkova
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd., 1784 Sofia, Bulgaria; (K.A.)
| | - Galya Staneva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria; (A.K.); (R.H.); (R.A.)
| | - Ivo Grabchev
- Faculty of Medicine, Sofia University “St. Kliment Ohridski”, 1 Koziak Street, 1407 Sofia, Bulgaria; (A.T.); (E.S.); (I.M.); (I.G.)
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Effect of amphiphilic phosphorous dendrons on the conformation, secondary structure, and zeta potential of albumin and thrombin. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04512-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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