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Stability and biocompatibility of a library of polyester dendrimers in comparison to polyamidoamine dendrimers
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
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2012 (English)In: Biomaterials, ISSN 0142-9612, E-ISSN 1878-5905, Vol. 33, no 7, 1970-1981 p.Article in journal (Refereed) Published
Abstract [en]

Dendrimers can be designed for several biomedical applications due to their well-defined structure, functionality and dimensions. The present study focused on the in vitro biocompatibility evaluation of a library of aliphatic polyester dendrimers based on 2,2-bis(methylol)propionic acid (bis-MPA) with an overall diameter of 0.5-2 nm. In addition, dendrimers with two different chemical surfaces (neutral with hydroxyl end group and anionic with carboxylic end group) and dendrons corresponding to the structural fragments of the dendrimers were evaluated. Commercial polyamidoamine dendrimers (PAMAM) with cationic (amine) or neutral (hydroxyl) end group were also included for comparison. Cell viability studies were conducted in human cervical cancer (HeLa) and acute monocytic leukemia cells (THP.1) differentiated into macrophage-like cells as well as in primary human monocyte-derived macrophages. Excellent biocompatibility was observed for the entire hydroxyl functional bis-MPA dendrimer library, whereas the cationic, but not the neutral PAMAM exerted dose-dependent cytotoxicity in cell lines and primary macrophages. Studies to evaluate material stability as a function of pH, temperature, and time, demonstrated that the stability of the 4th generation hydroxyl functional bis-MPA dendrimer increased at acidic pH. Taken together, bis-MPA dendrimers are degradable and non-cytotoxic to human cell lines and primary cells.

Place, publisher, year, edition, pages
2012. Vol. 33, no 7, 1970-1981 p.
Keyword [en]
Dendrimer, Biocompatibility, Cytokine secretion, Macrophage, Degradation
National Category
Cell and Molecular Biology Polymer Chemistry
URN: urn:nbn:se:kth:diva-87615DOI: 10.1016/j.biomaterials.2011.11.054ISI: 000300473900002PubMedID: 22177621ScopusID: 2-s2.0-84855729574OAI: diva2:501802
EU, FP7, Seventh Framework ProgrammeSwedish Research Council
QC 20120402Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2013-03-27Bibliographically approved
In thesis
1. Novel Porous Films from Functional and Biocompatible Linear-Dendritic Hybrids
Open this publication in new window or tab >>Novel Porous Films from Functional and Biocompatible Linear-Dendritic Hybrids
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the last decades, the fabrication of ordered nano- and microporous structures has attracted increasing interest due to their specific properties and multiple possible applications in electronics, as templates or in the biological field. The development of such materials has been favored by the introduction of the simple breath-figure templating method in the 1990’s. In order to fully exploit the potential of these porous materials, the use of advanced functional molecules as precursors is essential. One suitable class of molecules is the well-defined linear-dendritic hybrids (LD hybrids) family. The structural variations, multiple end-groups and possible amphiphilicity of these molecules are significant advantages that could lead to highly sophisticated functional materials with potential usage in biology. Therefore, this project was directed towards the synthesis of advanced LD hybrids and the evaluation of their ability to form ordered functional porous films.

A degradation and toxicity study was initially conducted on polyester-based 2,2-bis(methylol)propionic acid (bis-MPA) dendrimers under physiological conditions to support the potential usage of these molecules for biological purposes. The materials were found to undergo a relatively fast depolymerization process at pH 7.5. Moreover, the initial dendrimer and its decomposition products were proven to be non-toxic for immune competent cells, allowing for the utilization of these molecules for biological applications.

A linear-dendritic-linear hybrid library was successfully synthesized from biocompatible poly(ethylene glycol) (PEG), poly(ε-caprolactone) (PCL) and bis-MPA building blocks using a combination of ring-opening polymerization (ROP)and copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC). The materials, consisting of one long PEG block connected to the focal point of the dendron and several PCL arms attached at its periphery, were used to construct ordered porous films using the breath figure method. The polymeric architecture strongly affected the ordering of the films with a more regular morphology obtained from a more flexible polymer. Changing the semi-crystalline PCL to amorphous polylactide (PLA) also permitted the formation of porous arrays. Interestingly, films obtained from inverted structures possessing one long PCL block and several short PEG chains, also presented a regular morphology. Moreover they could be activated to exhibit multiple surface hydroxyl groups.

To increase the number of orthogonal synthetic methodologies available for the preparation of advanced macromolecules, high molecular weight dendritic macrothiols were synthesized. These molecules were efficiently coupled to a number of core molecules via thiol-ene coupling, generating a comprehensive library of dendritic materials. This approach represents an attractive alternative to the commonly used, but potentially toxic, CuAAC.

Exploiting the obtained results, a final LD hybrid was synthesized from atom transfer radical polymerization (ATRP) of 2-hydroxyethyl methacrylate (HEMA) derivatives and thiol-ene coupling (TEC) with macrothiols. This macromolecule was successfully utilized to form functional ordered porous arrays and the availability of peripheral alkyne functional groups was demonstrated by efficient coupling with fluorescent Rhodamine-B. The HEMA-backbone allowed for the introduction of cross-linkable azide groups that were used to significantly improve the thermal stability of the films from 50 °C to 200 °C. These materials have the potential to be used in applications such as catalysis, in medicine and as sensors.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 62 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2013:15
poly(ethylene glycol), poly(caprolactone), linear-dendritic hybrid; click chemistry, CuAAC, thiol-ene chemistry, amphiphilic polymer, honeycomb film, isoporous film, thiol, dendrimer
National Category
Polymer Technologies
urn:nbn:se:kth:diva-119985 (URN)978-91-7501-691-7 (ISBN)
Public defence
2013-04-19, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Swedish Research Council

QC 20130327

Available from: 2013-03-27 Created: 2013-03-26 Last updated: 2013-03-27Bibliographically approved

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